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        <title>pcblr88的凤凰博客</title>
        <link>http://blog.ifeng.com/1298968.html</link>
        <description><![CDATA[pcblr88的凤凰博客]]></description>
        <pubDate>Mon, 30 Nov 2009 14:13:51 +0800</pubDate>
        <lastBuildDate>Mon, 30 Nov 2009 14:13:51 +0800</lastBuildDate>
        <generator>REBORN 1.0(beta)</generator>
        <language>zh-cn</language>
                <item>
            <title><![CDATA[PCB设计流程]]></title>
            <link>http://blog.ifeng.com/article/3352853.html</link>
            <description><![CDATA[　　　　作为一个电子工程师设计电路是一项必备的硬功夫，但是原理设计再完美，如果电路板设计不合理，性能将大打折扣，严重时甚至不能正常工作，不管用什么软件，PCB设计有个大致的程序，按顺序来会省时省力，因此我将按制作流程来介绍一下，由于国产PCB设计软件青越锋界面风格与windows视窗接近，操作习惯也相近，使用的人也较多，将以此软件作说明。　　原理图设计是前期准备工作，经常见到初学者为了省事直接就去画PCB板了，这样将得不偿失，对简单的板子，如果熟练流程，不妨可以跳过。但是对于初学者一定要按流程来，这样一方面可以养成良好的习惯，原理图是根据设计的项目来的，只要电性连接正确没什么好说的。下面我们重 ……<br/><br/>……]]></description>
            <author>pcblr88</author>
            <comments>http://blog.ifeng.com/article/3352853.html#comment</comments>
            <pubDate>Wed, 28 Oct 2009 18:26:03 +0800</pubDate>
            <guid>3352853</guid>
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                <item>
            <title><![CDATA[全电脑织袜机]]></title>
            <link>http://blog.ifeng.com/article/2498136.html</link>
            <description><![CDATA[<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; mso-pagination: widow-orphan; mso-outline-level: 1"><B><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">关键词：</SPAN></B><B><SPAN lang=EN-US style="mso-bidi-font-size: 10.5pt"><A href="http://www.pcbon.net/ss_show.asp?id=3771"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><SPAN lang=EN-US>全电脑织袜机</SPAN></SPAN></A></SPAN></B><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体"><A href="http://www.pcbon.net/">PCB<SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'"><SPAN lang=EN-US>抄板</SPAN></SPAN></A></SPAN></B><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 18pt; LINE-HEIGHT: 16.5pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-char-indent-count: 2.0" align=left><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体"><A href="http://www.pcbon.net/ss_show.asp?id=3771"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥"><SPAN lang=EN-US>全电脑织袜机</SPAN></SPAN></A></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">是龙人大型电脑针织横机项目中的重要研究成果。目前，与某知名编织企业合作，我们已实现该产品全套仿制克隆，已在企业生产线上投入正常应用，为企业设备更新及成本节约提供了切实有效的手段。</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 11.25pt; LINE-HEIGHT: 16.5pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">龙人专项团队对全电脑织袜机的研究已涵盖众多产品种类及型号，部分典型产品已顺利完成了二次开发，为产品升级换代提供了条件。在此仅举某产品案例进行说明。</SPAN><TABLE class=MsoTableGrid style="BORDER-RIGHT: medium none; BORDER-TOP: medium none; BORDER-LEFT: medium none; BORDER-BOTTOM: medium none; BORDER-COLLAPSE: collapse; mso-border-alt: solid windowtext .5pt; mso-yfti-tbllook: 480; mso-padding-alt: 0cm 5.4pt 0cm 5.4pt; mso-border-insideh: .5pt solid windowtext; mso-border-insidev: .5pt solid windowtext" cellSpacing=0 cellPadding=0 border=1><TBODY><TR style="mso-yfti-irow: 0; mso-yfti-firstrow: yes; mso-yfti-lastrow: yes"><TD style="BORDER-RIGHT: #ebe9ed; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ebe9ed; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #ebe9ed; PADDING-TOP: 0cm; BORDER-BOTTOM: #ebe9ed; BACKGROUND-COLOR: transparent" vAlign=top><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 16.5pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">　<B>产品性能特点</B></SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 16.5pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">　　</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">·</SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">采用无滚筒全电脑控制方式；</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 16.5pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">　　</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">·</SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">提供</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">200</SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">中以上链条程序，也可按客户需求编制程序；</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 16.5pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">　　</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">·</SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">可编织出没有高宽限制的最多</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">16</SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">色型袜子；</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 16.5pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">　　</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">·</SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">高转速、高产量、短袜日产量可达</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">30</SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">打左右；</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 16.5pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">　　</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">·</SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">可根据客户的要求，采用意大利</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">DE ……<br/><br/>……</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 16.5pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 16.5pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left></TD><TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #ebe9ed; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid windowtext .5pt; mso-border-bottom-alt: solid windowtext .5pt; mso-border-right-alt: solid windowtext .5pt" vAlign=top><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 16.5pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left></TD></TR></TBODY></TABLE><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 16.5pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 16.5pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 16.5pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 16.5pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 16.5pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 16.5pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 16.5pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 16.5pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 16.5pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 16.5pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 16.5pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 16.5pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 16.5pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 16.5pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 16.5pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 16.5pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 16.5pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 16.5pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 16.5pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 16.5pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 16.5pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 11.25pt; LINE-HEIGHT: 16.5pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 24pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 24pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 11.25pt; LINE-HEIGHT: 16.5pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 11.25pt; LINE-HEIGHT: 16.5pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; mso-pagination: widow-orphan; mso-outline-level: 1"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt">]]></description>
            <author>pcblr88</author>
            <comments>http://blog.ifeng.com/article/2498136.html#comment</comments>
            <pubDate>Mon, 30 Mar 2009 17:23:15 +0800</pubDate>
            <guid>2498136</guid>
        </item>
                <item>
            <title><![CDATA[线路板PCB加工特殊制程]]></title>
            <link>http://blog.ifeng.com/article/1895290.html</link>
            <description><![CDATA[<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">线路板</SPAN><SPAN lang=EN-US>PCB</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">加工特殊制程</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">关键词：电路板</SPAN><SPAN lang=EN-US> PCB</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">抄板</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US>1</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US>Additive Process </SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">加成法</SPAN><SPAN lang=EN-US></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">指非导体的基板表面，在另加阻剂的协助下，以化学铜层进行局部导体线路的直接生长制程</SPAN><SPAN lang=EN-US>(</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">详见电路板信息杂志第</SPAN><SPAN lang=EN-US> 47 </SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">期</SPAN><SPAN lang=EN-US> P.62)</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。</SPAN><SPAN lang=EN-US><A href="http://wwwpcb.xinwen520.net/"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><SPAN lang=EN-US><FONT color=#295487>电路板</FONT></SPAN></SPAN></A></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">所用的加成法又可分为全加成、半加成及部份加成等不同方式。</SPAN><SPAN lang=EN-US>2</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US>Backpanels</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，</SPAN><SPAN lang=EN-US>Backplanes </SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">支撑板</SPAN><SPAN lang=EN-US></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">是一种厚度较厚</SPAN><SPAN lang=EN-US>(</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">如</SPAN><SPAN lang=EN-US> 0.093",0.125")</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的电路板，专门用以插接联络其它的板子。其做法是先插入多脚连接器</SPAN><SPAN lang=EN-US>(Connector)</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在紧迫的通孔中，但并不焊锡，而在连接器穿过板子的各导针上，再以绕线方式逐一接线。连接器上又可另行插入一般的电路板。由于这种特殊的板子 ……<br/><br/>……</SPAN><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt">]]></description>
            <author>pcblr88</author>
            <comments>http://blog.ifeng.com/article/1895290.html#comment</comments>
            <pubDate>Wed, 03 Dec 2008 16:37:47 +0800</pubDate>
            <guid>1895290</guid>
        </item>
                <item>
            <title><![CDATA[大环境不佳 PCB厂难免倒闭风波侵扰]]></title>
            <link>http://blog.ifeng.com/article/1852247.html</link>
            <description><![CDATA[<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">大环境不佳</SPAN><SPAN lang=EN-US> PCB</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">厂难免倒闭风波侵扰</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US><A href="http://www.dmpcb.cn/"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><SPAN lang=EN-US><FONT color=#216b8a>印刷电路板</FONT></SPAN></SPAN></A>(PCB)</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">产业流年不利，时逢市况不佳，加上经营条件转差，</SPAN><SPAN lang=EN-US>PCB</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">厂接连传出倒闭消息，在年初就有不少位于大陆华南地区小厂关门大吉，台厂不时出现经营不善的情况，上半年有连安电子、宏达等，在</SPAN><SPAN lang=EN-US>9</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">月初连老字号</SPAN><SPAN lang=EN-US>PCB</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">厂信丰利也惊传跳票。</SPAN><SPAN lang=EN-US>PCB</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">业者指出，虽然产业景气不好，但随着大陆地区的经营条件变差，</SPAN><SPAN lang=EN-US>PCB</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">压力会益趋沉重，不少业者待价而沽，或是风雨飘摇，预料到了年关相近之际，倒闭风波会达到高峰。</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US><A href="http://i.mop.com/pcblr/blog"><FONT color=#216b8a>PCB</FONT></A></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">业在</SPAN><SPAN lang=EN-US>2008</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">年初之际，在大陆华南地区就有不少小厂关闭，而</SPAN><SPAN lang=EN-US>2008</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">年全球景气不佳，大环境因素确实造成影响。</SPAN><SPAN lang=EN-US>PCB</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">小厂</SPAN><SPAN lang=EN-US>2008</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">年以来营运出现窘境，受到景气不佳影响以及扩厂 ……<br/><br/>……</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt">]]></description>
            <author>pcblr88</author>
            <comments>http://blog.ifeng.com/article/1852247.html#comment</comments>
            <pubDate>Sat, 15 Nov 2008 10:31:02 +0800</pubDate>
            <guid>1852247</guid>
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                <item>
            <title><![CDATA[PCB板的实现过程—原理图变成实体PCB电路板]]></title>
            <link>http://blog.ifeng.com/article/1788443.html</link>
            <description><![CDATA[<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">大家都知道理做</SPAN><SPAN lang=EN-US><A href="http://www.pcblab.net/PCB">PCB<SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><SPAN lang=EN-US>板</SPAN></SPAN></A></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">就是把设计好的原理图变成一块实实在在的</SPAN><SPAN lang=EN-US>PCB<A href="http://www.pcblab.net/"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><SPAN lang=EN-US>电路板</SPAN></SPAN></A>,</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">请别小看这一过程</SPAN><SPAN lang=EN-US>,</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">有很多原理上行得通的东西在工程中却难以实现</SPAN><SPAN lang=EN-US>,</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">或是别人能实现的东西另一些人却实现不了</SPAN><SPAN lang=EN-US>,</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">因此说做一块</SPAN><SPAN lang=EN-US>PCB</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">板不难</SPAN><SPAN lang=EN-US>,</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">但要做好一块</SPAN><SPAN lang=EN-US>PCB</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">板却不是一件容易的事情。</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">　　微电子领域的两大难点在于高频信号和微弱信号的处理</SPAN><SPAN lang=EN-US>,</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在这方面</SPAN><SPAN lang=EN-US>PCB</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">制作水平就显得尤其重要</SPAN><SPAN lang=EN-US>,</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">同样的原理设计</SPAN><SPAN lang=EN-US>,</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">同样的元器件</SPAN><SPAN lang=EN-US>,</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">不同的人制作出来的</SPAN><SPAN lang=EN-US>PCB</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">就具有不同的结果</SPAN><SPAN lang=EN-US>,</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">那么如何才能做出一块好的</SPAN><SPAN lang=EN-US>PCB</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">板呢</SPAN><SPAN lang=EN-US>?</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">根据我们以往的经验</SPAN><SPAN lang=EN-US>,</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">想就以下几方面谈谈自己的看法</SPAN><SPAN lang=EN-US>:</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">　　一、要明确设计目标</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">　　接受到一个设计任务</SPAN><SPAN lang=EN-US>,</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">首先要明确其设计目标</SPAN><SPAN lang=EN-US>,</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">是普通的</SPAN><SPAN lang=EN-US>PCB</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">板、高频</SPAN><SPAN lang=EN-US>PCB</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">板、小信号 ……<br/><br/>……</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US></SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt">]]></description>
            <author>pcblr88</author>
            <comments>http://blog.ifeng.com/article/1788443.html#comment</comments>
            <pubDate>Mon, 20 Oct 2008 11:19:19 +0800</pubDate>
            <guid>1788443</guid>
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                <item>
            <title><![CDATA[PCB工程师在层叠设计过程中要注意的几点]]></title>
            <link>http://blog.ifeng.com/article/1725923.html</link>
            <description><![CDATA[<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">较多的</SPAN><SPAN lang=EN-US><A href="http://www.pcblab.net/PCB/">PCB</A></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">工程师</SPAN><SPAN lang=EN-US>,</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">他们经常画电脑主板</SPAN><SPAN lang=EN-US>,</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">对</SPAN><SPAN lang=EN-US>Allegro</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">等优秀的工具非常的熟练</SPAN><SPAN lang=EN-US>,</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">但是</SPAN><SPAN lang=EN-US>,</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">非常可惜的是</SPAN><SPAN lang=EN-US>,</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">他们居然很少知道如何进行阻抗控制</SPAN><SPAN lang=EN-US>,</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">如何使用工具进行信号完整性分析</SPAN><SPAN lang=EN-US>.</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">如何使用</SPAN><SPAN lang=EN-US>IBIS</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">模型我觉得真正的</SPAN><SPAN lang=EN-US>PCB</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">高手应该还是信号完整性专家</SPAN><SPAN lang=EN-US>,</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">而不仅仅停留在连连线</SPAN><SPAN lang=EN-US>,</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">过过孔的基础上对布通一块板子容易，布好一块好难。</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">小资料</SPAN><SPAN lang=EN-US></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">　　对于电源、地的层数以及信号层数确定后，它们之间的相对排布位置是每一个</SPAN><SPAN lang=EN-US>PCB</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">工程师都不能回避的话题；</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">　　单板层的排布一般原则：</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">　　元件面下面（第二层）为地平面，提供器件屏蔽层以及为顶层布线提供参考平面；</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">　　所有信号层尽可能与地平面相邻；</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">　　尽量避免两信号层直接相邻；</SPAN><SPAN lang=EN-US>s</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">　　主电源尽可能与其对 ……<br/><br/>……</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US></SPAN>]]></description>
            <author>pcblr88</author>
            <comments>http://blog.ifeng.com/article/1725923.html#comment</comments>
            <pubDate>Sat, 20 Sep 2008 15:18:23 +0800</pubDate>
            <guid>1725923</guid>
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                <item>
            <title><![CDATA[【电子基础知识】测判三极管的口诀]]></title>
            <link>http://blog.ifeng.com/article/1675925.html</link>
            <description><![CDATA[<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">本人是从事</SPAN><B style="mso-bidi-font-weight: normal"><U style="text-underline: words"><SPAN lang=EN-US><A href="http://www.pcbwork.net/pcbcb.asp"><U style="text-underline: words"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><SPAN lang=EN-US>抄板</SPAN></SPAN></U></A></SPAN></U></B><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">相关行业的，相信在这个领域混的人应该不少吧，那么对三极管应该不陌生，但是关于它的口诀就未必大家都知道，下面就让龙人</SPAN><B style="mso-bidi-font-weight: normal"><U style="text-underline: words"><SPAN lang=EN-US><A href="http://www.dmpcb.cn/services/Chaoban/index.html"><U style="text-underline: words"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><SPAN lang=EN-US>抄板</SPAN></SPAN></U></A></SPAN></U></B><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">专家为大家做下简单地介绍。</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">三极管的管型及管脚的判别是电子技术初学者的一项基本功，为了帮助读者迅速掌握测判方法，笔者总结出四句口诀：</SPAN><SPAN lang=EN-US>“</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">三颠倒，找基极；</SPAN><SPAN lang=EN-US>PN</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">结，定管型；顺箭头，偏转大；测不准，动嘴巴。</SPAN><SPAN lang=EN-US>”</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">下面让我们逐句进行解释吧。</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">一、三颠倒，找基极</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">大家知道，三极管是含有两个</SPAN><SPAN lang=EN-US>PN</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">结的半导体器件。根据两个</SPAN><SPAN lang=EN-US>PN</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">结连接方式不同，可以分为</SPAN><SPAN lang=EN-US>NPN</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">型和</SPAN><SPAN lang=EN-US>PNP</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">型两种不同导电类型的三极管。</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">测试三极管要使用万用电表的欧姆挡，并选择</SPAN><SPAN lang=EN-US>R×100</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">或</SPAN><SPAN lang=EN-US>R×1k</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">挡位。对于指针式万用电表有，其红表笔所连 ……<br/><br/>……</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt">]]></description>
            <author>pcblr88</author>
            <comments>http://blog.ifeng.com/article/1675925.html#comment</comments>
            <pubDate>Fri, 29 Aug 2008 10:41:28 +0800</pubDate>
            <guid>1675925</guid>
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                <item>
            <title><![CDATA[选择抄板软件的几点建议]]></title>
            <link>http://blog.ifeng.com/article/1675924.html</link>
            <description><![CDATA[<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: Arial; mso-bidi-font-size: 10.5pt"><A href="http://www.dmpcb.cn/"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial"><SPAN lang=EN-US>抄板</SPAN></SPAN></A></SPAN></B><SPAN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">软件使用的越来越广泛，人们对它的要求也越来越高，当然软件越好抄出来的板子肯定是不一样的，下面就抄板软件的选择提几点建议：</SPAN><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: Arial; mso-bidi-font-size: 10.5pt"><B style="mso-bidi-font-weight: normal"><A href="http://www.lrpcb.cn/"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial"><SPAN lang=EN-US>抄板软件</SPAN></SPAN></A></B></SPAN><SPAN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">的好坏主要还是取决于功能是否完整，最好是把所有工作都能在抄板软件里去做，这样效率才高，包括元件的放置支持</SPAN><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: Arial; mso-bidi-font-size: 10.5pt">PROTEL99SE</SPAN><SPAN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">为最好，目前</SPAN><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: Arial; mso-bidi-font-size: 10.5pt">99SE</SPAN><SPAN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">的元件库非常丰富，可在互连网上下载到。这个也是很关键的事情，靠手工制作元件的时代已经过去，因为很多象</SPAN><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: Arial; mso-bidi-font-size: 10.5pt">BGP</SPAN><SPAN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">元件封装中有上百个之多的元素，靠手工再去建元件代价太大。</SPAN><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: Arial; mso-bidi-font-size: 10.5pt"></SPAN><SPAN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">为了电路稳定可靠，在设计电路时一般要有大块的铜皮和电源或地连接，这样可减少电路的噪声和干扰。所以涉及到网络铺铜的问题，对于复杂的</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: Arial; mso-bidi-font-size: 10.5pt"><A href="http://pcbliumin.blog.163.com/"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial"><SPAN lang=EN-US>电路板</SPAN></SPAN></A></SPAN></B><SPAN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">来说，铺铜上面有很多是要连接 ……<br/><br/>……</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt">]]></description>
            <author>pcblr88</author>
            <comments>http://blog.ifeng.com/article/1675924.html#comment</comments>
            <pubDate>Fri, 29 Aug 2008 10:40:51 +0800</pubDate>
            <guid>1675924</guid>
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            <title><![CDATA[SMT经典问答]]></title>
            <link>http://blog.ifeng.com/article/1666692.html</link>
            <description><![CDATA[<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">首先让我们的</SPAN><SPAN lang=EN-US><A href="http://www.lrpcb.cn/">pcb<SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><SPAN lang=EN-US>抄板</SPAN></SPAN></A></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">专家介绍先什么是</SPAN><SPAN lang=EN-US>SMT,SMT</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">是表面贴装技术或表面组装技术（</SPAN><SPAN lang=EN-US>Surface Mounted Technology</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的缩写），是目前电子组装行业里最流行的一种技术和工艺。</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（</SPAN><SPAN lang=EN-US>1</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）为什么要用表面贴装技术</SPAN><SPAN lang=EN-US>(SMT)</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">？</SPAN><SPAN lang=EN-US></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">电子产品追求小型化，以前使用的穿孔插件元件已无法缩小</SPAN><SPAN lang=EN-US></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">电子产品功能更完整，所采用的集成电路</SPAN><SPAN lang=EN-US>(IC)</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">已无穿孔元件，特别是大规模、高集成</SPAN><SPAN lang=EN-US>IC</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，不得不采用表面贴片元件</SPAN><SPAN lang=EN-US></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">产品批量化，生产自动化，厂方要以低成本高产量，出产优质产品以迎合顾客需求及加强市场竞争力</SPAN><SPAN lang=EN-US></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">电子元件的发展，集成电路</SPAN><SPAN lang=EN-US>(IC)</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的开发，半导体材料的多元应用</SPAN><SPAN lang=EN-US></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">电子科技革命势在必行，追逐国际潮流</SPAN><SPAN lang=EN-US></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（</SPAN><SPAN lang=EN-US>2</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）为什么在表面贴装技术中应用 ……<br/><br/>……</SPAN><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt">]]></description>
            <author>pcblr88</author>
            <comments>http://blog.ifeng.com/article/1666692.html#comment</comments>
            <pubDate>Mon, 25 Aug 2008 14:10:18 +0800</pubDate>
            <guid>1666692</guid>
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                <item>
            <title><![CDATA[芯片解密公司成功的关键]]></title>
            <link>http://blog.ifeng.com/article/1659701.html</link>
            <description><![CDATA[<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">中国近几年如雨后春笋般冒出的</SPAN><SPAN lang=EN-US>IC</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">设计、</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US><A href="http://www.icinf.com/" target=_blank><SPAN style="COLOR: windowtext; TEXT-DECORATION: none; text-underline: none">IC</SPAN><SPAN lang=EN-US style="COLOR: windowtext; FONT-FAMILY: 宋体; TEXT-DECORATION: none; text-underline: none; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><SPAN lang=EN-US>解密</SPAN></SPAN></A></SPAN></B><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">公司有几百家，数量多、规模小是中国</SPAN><SPAN lang=EN-US>IC</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">业的一个基本特征。这些做</SPAN><SPAN lang=EN-US>IC</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">解密、单片机解密、</SPAN><SPAN lang=EN-US>CPLD</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">解密和软件解密的解密公司要想成功，需要具备哪些关键要素？</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">龙人计算机</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US><A href="http://www.icdec.com/" target=_blank><SPAN lang=EN-US style="COLOR: windowtext; FONT-FAMILY: 宋体; TEXT-DECORATION: none; text-underline: none; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><SPAN lang=EN-US>芯片解密</SPAN></SPAN></A></SPAN></B><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">和软件解密技术研究工程师将为你回答这个问题。</SPAN><SPAN lang=EN-US></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">其一，技术要好，首先想到的是技术要高端，高科技发展迅速，</SPAN><SPAN lang=EN-US>IC</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">芯片更新的很快，要保证市场上每出现一新产品，就可以给解密出来</SPAN><SPAN lang=EN-US></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">其二，成功率要高，每个来解密的客户都是需要解密成功的。</SPAN><SPAN lang=EN-US></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">其三，引进专业的解密设备、先进的解密技术。</SPAN><SPAN lang=EN-US></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">其四，高效的供应链运作。除了外包、库存还有很多，这是一个完整的流程。一个成熟的设计公司，不仅库存和行销的策略和设计等等都是紧密的 ……<br/><br/>……</SPAN><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt">]]></description>
            <author>pcblr88</author>
            <comments>http://blog.ifeng.com/article/1659701.html#comment</comments>
            <pubDate>Thu, 21 Aug 2008 15:40:22 +0800</pubDate>
            <guid>1659701</guid>
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                <item>
            <title><![CDATA[影响中国PCB产业的部分因素简析]]></title>
            <link>http://blog.ifeng.com/article/1659697.html</link>
            <description><![CDATA[<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">关键词：</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US><A href="http://www.lrpcb.cn/"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><SPAN lang=EN-US>抄板</SPAN></SPAN></A></SPAN></B><SPAN lang=EN-US> pcb</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">抄板</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US><A href="http://www.dmpcb.cn/"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><SPAN lang=EN-US>电路板抄板</SPAN></SPAN></A></SPAN></B><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">中国自</SPAN><SPAN lang=EN-US>“</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">十一五</SPAN><SPAN lang=EN-US>”</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">以来，正在积极进行各个产业的调整及升级，其中也包括了</SPAN><SPAN lang=EN-US>PCB</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">产业。自</SPAN><SPAN lang=EN-US>2007</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">年以来不断调整的货币政策及陆续颁布的各项法令等等，都对</SPAN><SPAN lang=EN-US>PCB</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">厂商的经营环境产生相当大的影响。</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">人民币升值</SPAN><SPAN lang=EN-US></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">一些以出口为主的</SPAN><SPAN lang=EN-US>PCB</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">厂商，出口计价主要币种为美金，至于其它计价币种采用的比重较少，所以在外汇避险上通过币种转变的空间不多，较多厂商采用契约为约定汇率，或一定程度的汇率调整空间做为再议价的基础。　</SPAN><SPAN lang=EN-US></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">由于人民币不断升值，各个厂商收到美金后转换为人民币之数额定会减少，导致厂商出口成本提高，影响了</SPAN><SPAN lang=EN-US>PCB</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">出口价格。根据大致统计：目前</SPAN><SPAN lang=EN-US>PCB</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">各厂的成本结构约为人工成本占</SPAN><SPAN lang=EN-US>10</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">％、制造成本 ……<br/><br/>……</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US></SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt">]]></description>
            <author>pcblr88</author>
            <comments>http://blog.ifeng.com/article/1659697.html#comment</comments>
            <pubDate>Thu, 21 Aug 2008 15:39:09 +0800</pubDate>
            <guid>1659697</guid>
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                <item>
            <title><![CDATA[PCB布线软件的功能]]></title>
            <link>http://blog.ifeng.com/article/1640181.html</link>
            <description><![CDATA[<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><B style="mso-bidi-font-weight: normal"><I style="mso-bidi-font-style: normal"><SPAN lang=EN-US><A href="http://www.pcbon.net/"><SPAN style="COLOR: windowtext; TEXT-DECORATION: none; text-underline: none">PCB</SPAN><SPAN lang=EN-US style="COLOR: windowtext; FONT-FAMILY: 宋体; TEXT-DECORATION: none; text-underline: none; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><SPAN lang=EN-US>布线</SPAN></SPAN></A></SPAN></I></B><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">软件的书籍和资料大家应该都看得不少了，网上有很多布线技巧的文章，大都是教人如何避免干扰，如何走地线等等，其实这些软件里面还有一个功能，也很好用的，只是绝大部分的书籍都没有介绍。这就是</SPAN><SPAN lang=EN-US>NetClass</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">功能。</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US>    Pcb</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">文件首次加载网络表的时候，没有对其进行分类。这个功能可以人工将无数的网络连接分门别类，比如分成</SPAN><SPAN lang=EN-US>power</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US>data_bus</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US>Address_bus</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US>Hi_volta</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">等类别。这样分类后可以分别对不同的类别施加不同的布线策略。</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">好了，现在让我们尝试一下这个功能（以</SPAN><SPAN lang=EN-US>protel</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">为例）：</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">首先打开一个</SPAN><SPAN lang=EN-US>PCB</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">图；选择菜单</SPAN><SPAN lang=EN-US>“Design--&gt;Classes..”</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">跳出一个画面。</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">这里 ……<br/><br/>……</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt">]]></description>
            <author>pcblr88</author>
            <comments>http://blog.ifeng.com/article/1640181.html#comment</comments>
            <pubDate>Tue, 12 Aug 2008 16:11:45 +0800</pubDate>
            <guid>1640181</guid>
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                <item>
            <title><![CDATA[PCB抄板最新的发现-使用热转印纸快速自制线路板]]></title>
            <link>http://blog.ifeng.com/article/1640180.html</link>
            <description><![CDATA[<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">关键词：</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US><A href="http://www.pcb-ic.com/"><SPAN lang=EN-US style="COLOR: windowtext; FONT-FAMILY: 宋体; TEXT-DECORATION: none; text-underline: none; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><SPAN lang=EN-US>抄板</SPAN></SPAN></A></SPAN></B><SPAN lang=EN-US>pcb</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">抄板</SPAN><SPAN lang=EN-US> pcb</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">设计</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">工艺原理</SPAN><SPAN lang=EN-US>: </SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">　　主要采用了热转移的原理</SPAN><SPAN lang=EN-US>.</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">利用激光打印机的</SPAN><SPAN lang=EN-US>“</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">碳粉</SPAN><SPAN lang=EN-US>”(</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">含黑色塑料微粒</SPAN><SPAN lang=EN-US>)</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">受激光打印机的硒鼓静电吸引，在硒鼓上排列出精度极高的图形及文字，在消除静电后，转移于经过特殊处理的专用热转印纸上，并经高温熔化热压固定</SPAN><SPAN lang=EN-US>,</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">形成热转印纸版，再将该热转印纸覆盖在敷铜板上</SPAN><SPAN lang=EN-US>,</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">由于热转印纸是经过特殊处理的</SPAN><SPAN lang=EN-US>,</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">通过高分子技术在它的表面覆盖了数层特殊材料的涂层，使热转印纸具有耐高温不粘连的特性</SPAN><SPAN lang=EN-US>,</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">当温度达到</SPAN><st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="180.5" UnitName="℃"><SPAN lang=EN-US>180.5</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">℃</SPAN></st1:chmetcnv><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时，在高温和压力的作用下，热转印纸对融化的墨粉吸附力急剧下降，使融化的墨粉完全吸附在敷铜板上</SPAN><SPAN lang=EN-US>,</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">敷铜板冷却后</SPAN><SPAN lang=EN-US>,</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">形成紧固的有图形的保护层</SPAN><SPAN lang=EN-US>,</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">经过腐蚀后即可形成做工精美的印制 ……<br/><br/>……</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt">]]></description>
            <author>pcblr88</author>
            <comments>http://blog.ifeng.com/article/1640180.html#comment</comments>
            <pubDate>Tue, 12 Aug 2008 16:11:15 +0800</pubDate>
            <guid>1640180</guid>
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                <item>
            <title><![CDATA[单片机解密的常见问题解答]]></title>
            <link>http://blog.ifeng.com/article/1583860.html</link>
            <description><![CDATA[<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">1、你们在进行</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US><A href="http://www.icinf.com/"><SPAN style="COLOR: windowtext; TEXT-DECORATION: none; text-underline: none">IC</SPAN><SPAN lang=EN-US style="COLOR: windowtext; FONT-FAMILY: 宋体; TEXT-DECORATION: none; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; text-underline: none"><SPAN lang=EN-US>解密</SPAN></SPAN></A></SPAN></B><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时是否损害母片</SPAN><SPAN lang=EN-US>?</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">答</SPAN><SPAN lang=EN-US>:</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">目前</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US><A href="http://www.icdec.com/"><SPAN lang=EN-US style="COLOR: windowtext; FONT-FAMILY: 宋体; TEXT-DECORATION: none; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; text-underline: none"><SPAN lang=EN-US>单片机解密</SPAN></SPAN></A></SPAN></B><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">有两种做法，一种是一软件为主，称为非侵入型攻击，要借助一些软件，如类似编程器的自制设备，这种方法不破坏母片（解密后芯片处于不加密状态）；还有一种是硬件为主，辅助软件，称为侵入型攻击，这种方法需要剥开母片（开盖或叫开封，</SPAN><SPAN lang=EN-US>decapsulation</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">），然后做电路修改</SPAN><SPAN lang=EN-US>(</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">通常称</SPAN><SPAN lang=EN-US>FIB</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">：</SPAN><SPAN lang=EN-US>focused ion beam)</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，这种破坏芯片外形结构和芯片管芯线路只影响加密功能，不改变芯片本身功能。</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">2、你们解密是否可能失败？</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">答：可能失败。目前加密的最新技术不断出现、芯片烧断数据脚、</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US><A href="http://www.pcb-ic.com/IC/index.html"><SPAN lang=EN-US style="COLOR: windowtext; FONT-FAMILY: 宋体; TEXT-DECORATION: none; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; text-underline: none"><SPAN lang=EN-US>芯片</SPAN></SPAN><SPAN lang=EN-US style="COLOR: windowtext; FONT-FAMILY: 宋体; TEXT-DECORATION: none; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; text-underline: none"><SPAN lang=EN-US>解密</SPAN></SPAN></A></SPAN></B><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">开盖过程中存在的漏酸的可能以及电路修改过程中误操作等，这些都有可能造 ……<br/><br/>……</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt">]]></description>
            <author>pcblr88</author>
            <comments>http://blog.ifeng.com/article/1583860.html#comment</comments>
            <pubDate>Wed, 16 Jul 2008 17:59:21 +0800</pubDate>
            <guid>1583860</guid>
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                <item>
            <title><![CDATA[最权威的PCB抄板/PCB克隆流程简介]]></title>
            <link>http://blog.ifeng.com/article/1583855.html</link>
            <description><![CDATA[<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US><A href="http://www.pcblab.net/"><SPAN style="COLOR: windowtext; TEXT-DECORATION: none; text-underline: none">PCB</SPAN><SPAN lang=EN-US style="COLOR: windowtext; FONT-FAMILY: 宋体; TEXT-DECORATION: none; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; text-underline: none"><SPAN lang=EN-US>抄板</SPAN></SPAN></A></SPAN></B><SPAN lang=EN-US>/<B style="mso-bidi-font-weight: normal"><A href="http://pcbchaoban.atobo.com.cn/"><SPAN style="COLOR: windowtext; TEXT-DECORATION: none; text-underline: none">PCB</SPAN><SPAN lang=EN-US style="COLOR: windowtext; FONT-FAMILY: 宋体; TEXT-DECORATION: none; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; text-underline: none"><SPAN lang=EN-US>克隆</SPAN></SPAN></A></B></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">步骤如下：</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">第一步，拿到一块</SPAN><SPAN lang=EN-US>PCB</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，首先在纸上记录好所有元气件的型号，参数，以及位置，尤其是二极管，三机管的方向，</SPAN><SPAN lang=EN-US>IC</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">缺口的方向。最好用数码相机拍两张元气件位置的照片。</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">第二步，拆掉所有器件，并且将</SPAN><SPAN lang=EN-US>PAD</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">孔里的锡去掉。用酒精将</SPAN><SPAN lang=EN-US>PCB</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">清洗干净，然后放入扫描仪内，启动</SPAN><SPAN lang=EN-US>POHTOSHOP</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，用彩色方式将丝印面扫入，并打印出来备用。</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">第三步，用水纱纸将</SPAN><SPAN lang=EN-US>TOP LAYER </SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">和</SPAN><SPAN lang=EN-US>BOTTOM LAYER</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">两层轻微打磨，打磨到铜膜发亮，放入扫描仪，启动</SPAN><SPAN lang=EN-US>PHOTOSHOP</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，用彩色方式将两层分别扫入。注意，</SPAN><SPAN lang=EN-US>PCB</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在扫描仪内摆放一定要横平树直，否则扫描的图象就无法使用。</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">第四步，调整画布的对比度，明暗度， ……<br/><br/>……</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US></SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt">]]></description>
            <author>pcblr88</author>
            <comments>http://blog.ifeng.com/article/1583855.html#comment</comments>
            <pubDate>Wed, 16 Jul 2008 17:57:56 +0800</pubDate>
            <guid>1583855</guid>
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            <title><![CDATA[pcb中电气边界的定义]]></title>
            <link>http://blog.ifeng.com/article/1564267.html</link>
            <description><![CDATA[<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US>1 </SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">电气边界的定义</SPAN><SPAN lang=EN-US></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">电气边界用来限定布线和元件放置的范围，它是通过在禁止布线层（</SPAN><SPAN lang=EN-US>Keep Out Layer</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）绘制边界来实现的。禁止布线层是</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="mso-bidi-font-size: 10.5pt"><A href="http://www.pcbwork.net/pcbcb.asp"><SPAN style="COLOR: windowtext; TEXT-DECORATION: none; text-underline: none">PCB</SPAN></A></SPAN></B><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">工作空间中一个用来确定有效位置和布线区域的特殊工作层面，所有的信号层的目标对象和走线都被限制在电气边界之内。</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">通常用户电气边界应该略小于物理边界。这是因为在日常使用中，</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="mso-bidi-font-size: 10.5pt"><A href="http://www.pcbinf.com/"><SPAN lang=EN-US style="COLOR: windowtext; FONT-FAMILY: 宋体; TEXT-DECORATION: none; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; text-underline: none"><SPAN lang=EN-US>抄板</SPAN></SPAN></A></SPAN></B><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">难免会有磨损，为了保证电路板能够继续使用，我们制板时要留出一定的余地，使物理边界损坏后，由于电气边界小于物理边界，元器件的电气关系依然保持有效，电路板能够继续工作。</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">规划电气边界的方法与规划物理边界的方法完全相同，只不过是布置在</SPAN><SPAN lang=EN-US>Keep Out Layer</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（禁止布线层）上。在</SPAN><SPAN lang=EN-US>Protel ……<br/><br/>……</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US></SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt">]]></description>
            <author>pcblr88</author>
            <comments>http://blog.ifeng.com/article/1564267.html#comment</comments>
            <pubDate>Mon, 07 Jul 2008 17:20:38 +0800</pubDate>
            <guid>1564267</guid>
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                <item>
            <title><![CDATA[单片机解密技术－侵入破解方法]]></title>
            <link>http://blog.ifeng.com/article/1564263.html</link>
            <description><![CDATA[<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">目前</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black; mso-bidi-font-size: 10.5pt"><A href="http://wwwpcb.xinwen520.net/"><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: 宋体; TEXT-DECORATION: none; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; text-underline: none"><SPAN lang=EN-US>单片机</SPAN></SPAN></A></SPAN></B><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">渗透到我们生活的各个领域，几乎很难找到哪个领域没有单片机的踪迹。智能玩具、防盗系统、导弹的导航装置，飞机上各种仪表的控制，计算机的网络通讯等都离不开单片机。</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">一般正式产品中的</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black; mso-bidi-font-size: 10.5pt"><A href="http://www.lrpcb.cn/xinpian.asp"><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: 宋体; TEXT-DECORATION: none; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; text-underline: none"><SPAN lang=EN-US>单片机芯片</SPAN></SPAN></A></SPAN></B><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">都加密了，直接使用编程器是不能读出程序的。但有时候客户由于一些原因，需要得到单片机内部的程序，用来参考研究学习、找到丢失的资料或复制一些芯片，这就需要做</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black; mso-bidi-font-size: 10.5pt"><A href="http://www.pcbwork.net/xpjm.asp"><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: 宋体; TEXT-DECORATION: none; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; text-underline: none"><SPAN lang=EN-US>单片机解密</SPAN></SPAN></A></SPAN></B><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">了。</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 14.25pt; tab-stops: 252.0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">对于侵入</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black; mso-bidi-font-size: 10.5pt"><A href="http://www.pcbon.net/IC/index.asp"><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: 宋体; TEXT-DECORATION: none; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; text-underline: none"><SPAN lang=EN-US>破解</SPAN></SPAN></A></SPAN></B><I style="mso-bidi-font-style: normal"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">，</SPAN></I><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">该技术是直接暴露芯片内部连线，然后观察、操控、干扰单片机以达到攻击目的。一般过程如下：</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 15.75pt; tab-stops: 252.0pt; mso-char-indent-count: 1.5"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">中途休息，龙人计算机深圳分公司为了满足大量需要</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black"><A href="http://www.icinf.com/"><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: 宋体; TEXT-DECORATION: none; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; text-underline: none"><SPAN lang=EN-US>芯片解密</SPAN></SPAN></A></SPAN></B><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US style="COLOR: black; mso-bidi-font-size: 10.5pt">IC</SPAN><SPAN style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">解密</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black; mso-bidi-font-size: 10.5pt"><A href="http://pcbliumin.sohoxiaobao.com/"><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: 宋体; TEXT-DECORATION: none; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; text-underline: none"><SPAN lang=EN-US>单片机解密</SPAN></SPAN></A></SPAN></B><SPAN lang=EN-US>(MCU</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">解密</SPAN><SPAN lang=EN-US>)</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">和软件破解客户的需求特成立了</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black; mso-bidi-font-size: 10.5pt"><A href="http://www.icdec.com/"><SPAN style="COLOR: black; TEXT-DECORATION: none; text-underline: none">IC</SPAN><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: 宋体; TEXT-DECORATION: none; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; text-underline: none"><SPAN lang=EN-US>芯片解密</SPAN></SPAN></A></SPAN></B><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">事业部，事业 ……<br/><br/>……</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 14.25pt; tab-stops: 252.0pt"><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN>]]></description>
            <author>pcblr88</author>
            <comments>http://blog.ifeng.com/article/1564263.html#comment</comments>
            <pubDate>Mon, 07 Jul 2008 17:19:15 +0800</pubDate>
            <guid>1564263</guid>
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                <item>
            <title><![CDATA[单片机解密的讲解]]></title>
            <link>http://blog.ifeng.com/article/1516650.html</link>
            <description><![CDATA[<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">一天，朋友问我什么是<B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black"><A href="http://www.pcbon.net/"><SPAN lang=EN-US style="COLOR: black; TEXT-DECORATION: none; text-underline: none"><SPAN lang=EN-US>单片机解密</SPAN></SPAN></A></SPAN></B>，并说他要去一家做<B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black"><A href="http://www.pcbwork.net/xpjm.asp"><SPAN lang=EN-US style="COLOR: black; TEXT-DECORATION: none; text-underline: none"><SPAN lang=EN-US>单片机解密</SPAN></SPAN></A></SPAN></B>的公司当助理，不管怎么样至少这概念要知道<SPAN lang=EN-US>.</SPAN>结果我就开始在互联网的海洋里帮他找了，经过对比，与同事们的探讨，最后觉得下面的解释最合适不过了，于是就给他发过去了，这不也拿来与大家分享分享<SPAN lang=EN-US>.</SPAN></SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt"><A href="http://www.dmpcb.cn/services/ic"><SPAN lang=EN-US style="COLOR: black; TEXT-DECORATION: none; text-underline: none"><SPAN lang=EN-US>单片机解密</SPAN></SPAN></A></SPAN></B><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">又称<B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black"><A href="http://www.pcbwork.net/"><SPAN lang=EN-US style="COLOR: black; TEXT-DECORATION: none; text-underline: none"><SPAN lang=EN-US>单片机破解</SPAN></SPAN></A></SPAN></B>、单片机攻击、<B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black"><A href="http://www.lrpcb.cn/xinpian.asp"><SPAN style="COLOR: black; TEXT-DECORATION: none; text-underline: none">MCU</SPAN><SPAN lang=EN-US style="COLOR: black; TEXT-DECORATION: none; text-underline: none"><SPAN lang=EN-US>解密</SPAN></SPAN></A></SPAN></B>、<SPAN lang=EN-US>MCU</SPAN>破解，就是通过一定的设备和方法，直接得到加密了的单片机中的烧写文件。由于正式产品中的单片机芯片都加密了，直接使用编程器是不能读出程序的。但有时候客户由于一些原因，需要得到单片机内部的程序，用来参考研究学习、找到丢失的资料或复制一些芯片，这就需要做<B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black"><A href="http://www.icdec.com/"><SPAN lang=EN-US style="COLOR: black; TEXT-DECORATION: none; text-underline: none"><SPAN lang=EN-US>单片机解密</SPAN></SPAN></A></SPAN></B>了。<SPAN lang=EN-US></SPAN>我们解密后可以保证我们提供样片的功能和原来 ……<br/><br/>……<SPAN lang=EN-US></SPAN></SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt">]]></description>
            <author>pcblr88</author>
            <comments>http://blog.ifeng.com/article/1516650.html#comment</comments>
            <pubDate>Sat, 14 Jun 2008 14:10:28 +0800</pubDate>
            <guid>1516650</guid>
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                <item>
            <title><![CDATA[PCB抄板测试制作要求]]></title>
            <link>http://blog.ifeng.com/article/1516643.html</link>
            <description><![CDATA[<H3 style="MARGIN: 13pt 0cm"><B><SPAN lang=EN-US style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt; mso-font-kerning: 0pt">1.<A href="http://www.pcbwork.net/pcbcb.asp"><SPAN style="COLOR: black; TEXT-DECORATION: none; text-underline: none">PCB</SPAN><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: 宋体; TEXT-DECORATION: none; text-underline: none; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial"><SPAN lang=EN-US>抄板</SPAN></SPAN></A></SPAN></B><B><SPAN style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">基准点标记制作要求</SPAN></B></H3><P class=MsoNormal style="MARGIN: 12pt 0cm; TEXT-INDENT: 24pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><SPAN lang=EN-US style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: Arial; mso-font-kerning: 0pt">(1) </SPAN><SPAN style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">基准标志常用图形有正方形、圆形、三角形和十字形，基准点标记最小的直径为</SPAN><st1:chmetcnv w:st="on" UnitName="mm" SourceValue=".5" HasSpace="False" Negative="False" NumberType="1" TCSC="0"><SPAN lang=EN-US style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: Arial; mso-font-kerning: 0pt">0.5mm</SPAN></st1:chmetcnv><SPAN style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">，最大为</SPAN><st1:chmetcnv w:st="on" UnitName="mm" SourceValue="3" HasSpace="False" Negative="False" NumberType="1" TCSC="0"><SPAN lang=EN-US style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: Arial; mso-font-kerning: 0pt">3mm</SPAN></st1:chmetcnv><SPAN style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">。一般置</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: Arial; mso-font-kerning: 0pt">2~3</SPAN><SPAN style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">个直径为</SPAN><st1:chmetcnv w:st="on" UnitName="mm" SourceValue="1" HasSpace="False" Negative="False" NumberType="1" TCSC="0"><SPAN lang=EN-US style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: Arial; mso-font-kerning: 0pt">1mm</SPAN></st1:chmetcnv><SPAN style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">的实心圆于板对角线上作为基准标志。如是拼板，则每块拼板应</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: Arial; mso-font-kerning: 0pt"><A href="http://www.pcbsj.com/"><SPAN style="COLOR: black; TEXT-DECORATION: none; text-underline: none">PCB</SPAN><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: 宋体; TEXT-DECORATION: none; text-underline: none; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial"><SPAN lang=EN-US>设计</SPAN></SPAN></A></SPAN></B><SPAN style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">有基准标志；</SPAN><P class=MsoNormal style="MARGIN: 12pt 0cm; TEXT-INDENT: 24pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><SPAN lang=EN-US style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: Arial; mso-font-kerning: 0pt">(2) </SPAN><SPAN style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">同一块</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: Arial; mso-font-kerning: 0pt"><A href="http://www.pcbon.net/"><B style="mso-bidi-font-weight: normal"><SPAN style="COLOR: black; TEXT-DECORATION: none; text-underline: none">pcb</SPAN></B><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: 宋体; TEXT-DECORATION: none; text-underline: none; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial"><SPAN lang=EN-US>抄</SPAN></SPAN></B><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: 宋体; TEXT-DECORATION: none; text-underline: none; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial"><SPAN lang=EN-US>板</SPAN></SPAN></B></A></SPAN><SPAN style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">上的标记尺寸力求相同，变化不许超过</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: Arial; mso-font-kerning: 0pt">25μm</SPAN><SPAN style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">；</SPAN><P class=MsoNormal style="MARGIN: 12pt 0cm; TEXT-INDENT: 24pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><SPAN lang=EN-US style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: Arial; mso-font-kerning: 0pt">(3) </SPAN><SPAN style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">基准点可以是裸铜</SPAN><B style="mso-bidi-font-weight: normal"><I style="mso-bidi-font-style: normal"><SPAN lang=EN-US style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: Arial; mso-font-kerning: 0pt"><A href="http://pcbsky.xinwen520.net/"><SPAN style="COLOR: black; FONT-STYLE: normal; TEXT-DECORATION: none; text-underline: none">PCB</SPAN><SPAN lang=EN-US style="COLOR: black; FONT-STYLE: normal; FONT-FAMILY: 宋体; TEXT-DECORATION: none; text-underline: none; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial"><SPAN lang=EN-US>抄板</SPAN></SPAN></A></SPAN></I></B><SPAN style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">，或在上面镀镍、镀锡、镀焊料</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: Arial; mso-font-kerning: 0pt">(HASL</SPAN><SPAN style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">，厚度</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: Arial; mso-font-kerning: 0pt">7</SPAN><SPAN style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">～</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: Arial; mso-font-kerning: 0pt">10μm)</SPAN><SPAN style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">。镀层厚度首选</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: Arial; mso-font-kerning: 0pt">5</SPAN><SPAN style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">～</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: Arial; mso-font-kerning: 0pt">10μm</SPAN><SPAN style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">，最大不超过</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: Arial; mso-font-kerning: 0pt">25μm</SPAN><SPAN style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">，基准点表面平整度应该在</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: Arial; mso-font-kerning: 0pt">15μm</SPAN><SPAN style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">内；</SPAN><P class=MsoNormal style="MARGIN: 12pt 0cm; TEXT-INDENT: 24pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><SPAN lang=EN-US style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: Arial; mso-font-kerning: 0pt">(4) </SPAN><SPAN style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">基准点离印制板边缘至少</SPAN><st1:chmetcnv w:st="on" UnitName="mm" SourceValue="5" HasSpace="False" Negative="False" NumberType="1" TCSC="0"><SPAN lang=EN-US style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: Arial; mso-font-kerning: 0pt">5mm</SPAN></st1:chmetcnv><SPAN style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">，形状不规则的板应该另外加</SPAN><st1:chmetcnv w:st="on" UnitName="mm" SourceValue="5" HasSpace="False" Negative="False" NumberType="1" TCSC="0"><SPAN lang=EN-US style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: Arial; mso-font-kerning: 0pt">5mm</SPAN></st1:chmetcnv><SPAN style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">的板边。放置位于板和元器件的对角线，基准点标记周围 ……<br/><br/>……</SPAN><P class=MsoNormal style="MARGIN: 12pt 0cm; TEXT-INDENT: 24pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 12pt 0cm; TEXT-INDENT: 24pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 12pt 0cm; TEXT-INDENT: 24pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><B><SPAN lang=EN-US style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: Arial; mso-font-kerning: 0pt"></SPAN></B><SPAN lang=EN-US style="FONT-SIZE: 11.5pt; COLOR: black; FONT-FAMILY: Arial; mso-font-kerning: 0pt"></SPAN>]]></description>
            <author>pcblr88</author>
            <comments>http://blog.ifeng.com/article/1516643.html#comment</comments>
            <pubDate>Sat, 14 Jun 2008 14:08:36 +0800</pubDate>
            <guid>1516643</guid>
        </item>
                <item>
            <title><![CDATA[盲孔抄板制作知识探讨]]></title>
            <link>http://blog.ifeng.com/article/1488159.html</link>
            <description><![CDATA[<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 0pt">随着电子产品向高密度，高精度发展，相应对线路板提出了同样的要求。而提高</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt"><A href="http://www.dmpcb.cn/"><SPAN style="COLOR: black; TEXT-DECORATION: none; text-underline: none">pcb</SPAN><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: 宋体; TEXT-DECORATION: none; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; text-underline: none"><SPAN lang=EN-US>抄板</SPAN></SPAN></A></SPAN></B><SPAN style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 0pt">密度最有效的方法是减少通孔的数量，及精确设置盲孔，埋孔来实现。</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt">1</SPAN><SPAN style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 0pt">．</SPAN><SPAN style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 0pt">盲孔定义</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt">a</SPAN><SPAN style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 0pt">：与通孔相对而言，通孔是指各层均钻通的孔，盲孔则是非钻通孔。</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt">b</SPAN><SPAN style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 0pt">：盲孔细分：盲孔</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt">(BLIND HOLE)</SPAN><SPAN style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 0pt">，埋孔</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt"> BURIED HOLE</SPAN><SPAN style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 0pt">（外层不可看见）</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt">; c</SPAN><SPAN style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 0pt">：从制作流程上区分：（机械）盲孔在压合前钻孔，而通孔是在压合后钻孔。</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt">2</SPAN><SPAN style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 0pt">．</SPAN><SPAN style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 0pt">制作方法：</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt">a</SPAN><SPAN style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 0pt">：钻带：</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt">(1)</SPAN><SPAN style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 0pt">：选取参考点：</SPAN><SPAN style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 0pt">选择通孔（即首钻带中的一个孔）作为单元参考孔。（</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt">2</SPAN><SPAN style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 0pt">）：每一条盲孔钻带均需选择一个孔，</SPAN><SPAN style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 0pt">标注其相对单元参考孔的坐标。（</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt">3</SPAN><SPAN style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 0pt">）：注意说明哪条钻带对应哪几层：单元分孔图及钻咀表均需注明，且 ……<br/><br/>……</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt"></SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; mso-font-kerning: 0pt"></SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt">]]></description>
            <author>pcblr88</author>
            <comments>http://blog.ifeng.com/article/1488159.html#comment</comments>
            <pubDate>Sat, 31 May 2008 14:03:51 +0800</pubDate>
            <guid>1488159</guid>
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