<?xml version="1.0" encoding="utf-8" ?>
<rss version="2.0">
    <channel>
        <title>kenny_pcb的凤凰博客</title>
        <link>http://blog.ifeng.com/1111833.html</link>
        <description><![CDATA[kenny_pcb的凤凰博客]]></description>
        <pubDate>Mon, 30 Nov 2009 02:11:06 +0800</pubDate>
        <lastBuildDate>Mon, 30 Nov 2009 02:11:06 +0800</lastBuildDate>
        <generator>REBORN 1.0(beta)</generator>
        <language>zh-cn</language>
                <item>
            <title><![CDATA[PCB钻孔时垫板选择技巧]]></title>
            <link>http://blog.ifeng.com/article/3375227.html</link>
            <description><![CDATA[　　<A href="http://www.51chaoban.com">线路板钻孔</A>用上垫板的要求是：有一定表面硬度防止钻孔上表面毛刺。但又不能太硬而磨损钻头。要求上下垫板本身树脂成分不能过高，否则钻孔时将会形成熔融的树脂球黏附在孔壁。导热系数越大越好大，以便能迅速将钻孔时产生的热量带走，降低钻孔孔时钻头的温度，防止钻头退火。要有一定的刚性防止提钻时板材颤动，又要有一定弹性当钻头下钻接触的瞬间立即变形，使钻头精确地对准被钻孔的位置，保证钻孔位置精度。材质要均匀不能有杂质产生软硬不均的节点，否则容易断钻头。如果上垫板表面又硬又滑，小直径的钻头可能打滑偏离原来的孔位在线路板上钻出椭圆的斜孔。 　　国内使用的上垫板主要时０。2～０。５mm厚的酚醛纸胶板环氧玻璃布板和铝 ……<br/><br/>……]]></description>
            <author>kenny_pcb</author>
            <comments>http://blog.ifeng.com/article/3375227.html#comment</comments>
            <pubDate>Sat, 31 Oct 2009 10:03:10 +0800</pubDate>
            <guid>3375227</guid>
        </item>
                <item>
            <title><![CDATA[PCB光绘CAM工艺流程]]></title>
            <link>http://blog.ifeng.com/article/2992132.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'">　　</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">　　在</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'">制程中，光绘是一道重要工序。大家已有</SPAN><SPAN lang=EN-US>CAD</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的概念，但在使用光绘机的时候必须要有</SPAN><SPAN lang=EN-US>CAM</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的概念。因为每个厂的工艺流程和技术水平各不相同，要达到用户的最终要求，必须在制作工艺中做出必要的调整，以达到用户有关精度等各方面的要求。因此</SPAN><SPAN lang=EN-US>CAM</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">是光绘生产中心必不可少的工序。镜像、阻焊扩大、工艺线、工艺框、线宽调整、中心孔、外形线等问题都要在</SPAN><SPAN lang=EN-US>CAM</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">这道工序来完成。</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）检查用户的文件</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'">　　用户拿来的文件，首先要进行例行的检查：</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'">检查磁盘文件是否完好；</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>2.</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">检查该文件是否带有病毒，有病毒则必须先杀病毒；</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>3.</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">如果是</SPAN><SPAN lang=EN-US>Gerber</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">文件，则检查有无</SPAN><SPAN lang=EN-US>D</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">码表或内含</SPAN><SPAN lang=EN-US>D</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">码。</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'">　　（二）检查设计是否符 ……<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"><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 style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"></SPAN>]]></description>
            <author>kenny_pcb</author>
            <comments>http://blog.ifeng.com/article/2992132.html#comment</comments>
            <pubDate>Wed, 29 Jul 2009 10:19:36 +0800</pubDate>
            <guid>2992132</guid>
        </item>
                <item>
            <title><![CDATA[从PCB接单看电子布局 下半年旺季将来临]]></title>
            <link>http://blog.ifeng.com/article/1681838.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'">时序进入下半年的电子产业旺季，从</SPAN><SPAN lang=EN-US><A href="http://www.pcb-ic.com/">PCB</A></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">厂商的接单角度观察，目前看来似乎仅有笔记型计算机﹙</SPAN><SPAN lang=EN-US>NB</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">﹚产业后续的景气状况较为明朗，其它的诸如</SPAN><SPAN lang=EN-US>PC</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、网通等则仍嫌薄弱。以布局的角度来看，目前可针对</SPAN><SPAN lang=EN-US>NB</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">相关产业如代工、零组件等相关个股进行布局。</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'">在步出传统的第二季淡季后，电子产业正式迎向下半年旺季效应的来临。从整体大环境进行观察与剖析，由于</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'">是任何电子产业不可或缺的重要零组件，因此从</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'">接单角度来看，最能领先掌握景气脉动的轨迹。而综观各主要电子业，目前看来应以</SPAN><SPAN lang=EN-US>NB</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">产业链成长动能相对强劲。</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'">就目前台系较具规模的</SPAN><SPAN lang=EN-US>NBPCB</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">厂来看，主要包括金像电、瀚宇博、以及健鼎等。其中金像电第</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'">季营运已领先伴随</SPAN><SPAN lang=EN-US>NB</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">产业淡季 ……<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"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 14.25pt">]]></description>
            <author>kenny_pcb</author>
            <comments>http://blog.ifeng.com/article/1681838.html#comment</comments>
            <pubDate>Mon, 01 Sep 2008 11:47:30 +0800</pubDate>
            <guid>1681838</guid>
        </item>
                <item>
            <title><![CDATA[印刷电路PCB的基本作用]]></title>
            <link>http://blog.ifeng.com/article/1681833.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'">  印制电路是指在绝缘基材上，按预定设计，制成印制线路、印制元件或由两者结合而成的导电图形，在绝缘基材上，提供元器件之间电气连接的导电图形，称为印制线路，不包括印制元件。</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'">印制电路或者印制线路的成品板称为</SPAN><B style="mso-bidi-font-weight: normal"><I style="mso-bidi-font-style: normal"><SPAN lang=EN-US><A href="http://www.pcbwork.net/"><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>印制电路板</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'">或者印制线路板，亦称印制板，英文名称是</SPAN><SPAN lang=EN-US>Printed circuit Board(</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">也有称</SPAN><SPAN lang=EN-US>Printed Wiring Board)</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，缩写是</SPAN><SPAN lang=EN-US>PCB(PWB)</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。印制电路板是电子工业的重要部件之一。几乎每种电子设备，小到电子手表、计算器，大到计算机、通讯电子设备、军用武器系统，只要有集成电路等电子元器件，为了电气互连，都要使用印制板。在较大型的电子产品研究过程中，最基本的成功因素是该产品的印 ……<br/><br/>……</SPAN><SPAN lang=EN-US></SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.1pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US></SPAN>]]></description>
            <author>kenny_pcb</author>
            <comments>http://blog.ifeng.com/article/1681833.html#comment</comments>
            <pubDate>Mon, 01 Sep 2008 11:45:11 +0800</pubDate>
            <guid>1681833</guid>
        </item>
                <item>
            <title><![CDATA[PCB选择性焊接技术-龙人pcb抄板专家]]></title>
            <link>http://blog.ifeng.com/article/1630502.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'">文章整理：龙人</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'">抄板公司（</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US><A href="http://www.pcbwork.net">http://www.pcbwork.net</A></SPAN></B><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）</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'">回顾近年来电子工业工艺发展历程，可以注意到一个很明显的趋势就是回流焊技术。原则上传统插装件也可用回流焊工艺，这就是通常所说的通孔回流焊接。其优点是有可能在同一时间内完成所有的焊点，使生产成本降到最低。然而温度敏感元件却限制了回流焊接的应用，无论是插装件还是</SPAN><SPAN lang=EN-US>SMD</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。继而人们把目光转向选择焊接。大多数应用中都可以在回流焊接之后采用选择焊接。这将成为经济而有效地完成剩余插装件的焊接方法，而且与将来的无铅焊接完全兼容。</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'">选择性焊接的工艺特点　</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'">可通过与波峰焊的比较来了解选择性焊接的工艺特点。两者间最明显的差异在于波峰焊中</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US><A href="http://www.pcbwork.net/">PCB</A></SPAN></B><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的下 ……<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">]]></description>
            <author>kenny_pcb</author>
            <comments>http://blog.ifeng.com/article/1630502.html#comment</comments>
            <pubDate>Thu, 07 Aug 2008 15:09:46 +0800</pubDate>
            <guid>1630502</guid>
        </item>
                <item>
            <title><![CDATA[PCB多层板设计技术]]></title>
            <link>http://blog.ifeng.com/article/1630499.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.dmpcb.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>多层板</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'">设计技术，可以说多层板和双层板设计差不多，甚至布线更容易。</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'">你有双层板的设计经验的放，设计多层就不难了。</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'">首先，你要划分层迭结构，为了方便设计，最好以基板为中心，向两侧对称分布，相临信号层之间用电地层隔离。</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'">层迭结构</SPAN><SPAN lang=EN-US>(4</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">层、</SPAN><SPAN lang=EN-US>6</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">层、</SPAN><SPAN lang=EN-US>8</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">层、</SPAN><SPAN lang=EN-US>16</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">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'">：</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'">对于传输线，顶底层采用微带线模型分析，内部信号层用带状线模型。</SPAN><SPAN lang=EN-US>6</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">层</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'">层</SPAN><SPAN lang=EN-US>/14</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">层</SPAN><SPAN lang=EN-US>/18</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">层基板两侧的信号层最好用软件仿真，比较麻烦。</SPAN><SPAN lang=EN-US>    6</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">层</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'">层</SPAN><SPAN lang=EN-US>/14</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">层</SPAN><SPAN lang=EN-US>/18</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">层等基板两侧是信号层，没有电地隔离，需要注意相临层垂直走线和避免交流环路。</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'">如果还有其他电源，优先在信号层走粗线，尽量不要分割电地层。</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'">其次，向厂家询问参数</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'">介电常数、线宽、铜厚、板厚</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'"> ……<br/><br/>……</SPAN><SPAN lang=EN-US></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>kenny_pcb</author>
            <comments>http://blog.ifeng.com/article/1630499.html#comment</comments>
            <pubDate>Thu, 07 Aug 2008 15:09:14 +0800</pubDate>
            <guid>1630499</guid>
        </item>
                <item>
            <title><![CDATA[PCB抄板行业职业指导（下）]]></title>
            <link>http://blog.ifeng.com/article/1591495.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'">技能储备</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'">技能储备对于提高效率很有好处。工欲善其事，必先利其器。对于</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'">抄板或者</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'">设计工程师而言，技能方面的储备主要涉及基本技能，专业技能，和职业技能几个方面。</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'">基本技能和一些基础知识有时很难分清，但都是我们容易忽视的地方。基本技能包括对各种基础的</SPAN><B style="mso-bidi-font-weight: normal"><I style="mso-bidi-font-style: normal"><SPAN lang=EN-US><A href="http://pcbcb.xinwen520.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></I></B><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">软硬件设备的熟悉。例如键盘指法就需要重视。托</SPAN><SPAN lang=EN-US>OICQ</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的福，很多人的基本指法都已经过关了，但是能够花</SPAN><SPAN lang=EN-US>20~30</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">个小时认真进行一些指法方面的基础训练话，我相信在未来的工作中可以节省</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'">倍或者上百倍的时间。对于基本的抄板编辑软件等，同样的花一些时间熟悉和了解都会是事半功倍的效果。基础硬件方面可能要求不会很高，示波器，频谱仪，信号源之类的，这些东 ……<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>]]></description>
            <author>kenny_pcb</author>
            <comments>http://blog.ifeng.com/article/1591495.html#comment</comments>
            <pubDate>Sun, 20 Jul 2008 14:09:42 +0800</pubDate>
            <guid>1591495</guid>
        </item>
                <item>
            <title><![CDATA[PCB抄板行业职业指导(上）]]></title>
            <link>http://blog.ifeng.com/article/1591492.html</link>
            <description><![CDATA[<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">为将进入</SPAN><B style="mso-bidi-font-weight: normal"><I style="mso-bidi-font-style: normal"><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"><A href="http://www.pcb-ic.com/"><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></I></B><SPAN style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">这个行业的同学们写一些个人简单的想法。</SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">1</SPAN><SPAN style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">、现在是很好的年代</SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">(</SPAN><SPAN style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">过去的</SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">5</SPAN><SPAN style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">年和未来的</SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">5</SPAN><SPAN style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">年</SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">) </SPAN><SPAN style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">我们很幸运，在现在这个年代在</SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">PCB</SPAN><SPAN style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">抄板这个专业方向开始自己的职业生涯。从过去的</SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">20</SPAN><SPAN style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">年到未来的</SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">20</SPAN><SPAN style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">年中，电子数码产品在现在这个年代肯定是最好的黄金时代。尤其是在中国，今年</SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">PCB</SPAN><SPAN style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">电路板的需求量将受奥运会的带动达到一个高潮，我们现在几乎拥有</SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">PCB</SPAN><SPAN style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">抄板这个行业所需要的一切要素，而且正在飞快的发展。在技术方面，</SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">5</SPAN><SPAN style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">年前，我们所接触和了解的技术远远落后于整个产业的水平。设计工艺差距，抄板软件的差距，电子教科书差距，国内整体技术水平差距，等等。现在这些差距正在逐渐缩小，很多方面基本上已经消失。并且有些达到了 ……<br/><br/>……</SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"></SPAN>]]></description>
            <author>kenny_pcb</author>
            <comments>http://blog.ifeng.com/article/1591492.html#comment</comments>
            <pubDate>Sun, 20 Jul 2008 14:07:57 +0800</pubDate>
            <guid>1591492</guid>
        </item>
                <item>
            <title><![CDATA[pcb抄板的布线技术]]></title>
            <link>http://blog.ifeng.com/article/1505248.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'">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://pcb007.xinwen520.net/"><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: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><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'">时是选用双面板还是多层板，要看最高工作频率和电路系统的复杂程度以及对组装密度的要求来决定。在时钟频率超过</SPAN><SPAN lang=EN-US>200MHZ</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时最好选用多层板。如果工作频率超过</SPAN><SPAN lang=EN-US>350MHz</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，最好选用以聚四氟乙烯作为介质层的</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.pcbon.net/"><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: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><SPAN lang=EN-US>抄</SPAN></SPAN><SPAN lang=EN-US style="COLOR: black; 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>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'">，因为它的高频衰耗要小些，寄生电容要小些，传输速度要快些，还由于</SPAN><SPAN lang=EN-US>Z0</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">较大而省功耗，对</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.dmpcb.cn/"><SPAN lang=EN-US style="COLOR: black; 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>电路板抄板</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'">的走线有如下原则要求</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'">）所有平行信号线之间要尽量留有较大的间隔，以减少串扰。如果有两条相距较近的信号线，最好在两线之间走一条接地线，这样可以起到屏蔽作用。</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US>(2)<A href="http://www.pcbsj.com/"><B style="mso-bidi-font-weight: normal"><SPAN style="COLOR: black; TEXT-DECORATION: none; mso-bidi-font-size: 10.5pt; 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; mso-bidi-font-size: 10.5pt; text-underline: none; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><SPAN lang=EN-US>设计</SPAN></SPAN></B></A></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">信号传输线时要避免急拐弯，以防传输线特性阻抗的突变而产生反射，要尽量设计成具有一定尺寸的均匀的圆弧线。</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'">印制线的宽度可 ……<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">]]></description>
            <author>kenny_pcb</author>
            <comments>http://blog.ifeng.com/article/1505248.html#comment</comments>
            <pubDate>Mon, 09 Jun 2008 12:00:19 +0800</pubDate>
            <guid>1505248</guid>
        </item>
                <item>
            <title><![CDATA[pcb设计新手的导航知识]]></title>
            <link>http://blog.ifeng.com/article/1493650.html</link>
            <description><![CDATA[<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">你刚接触</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><A href="http://www.pcb-ic.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; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; text-underline: none"><SPAN lang=EN-US>设计</SPAN></SPAN></A></SPAN></B><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">吗？假如是那么相信下面对你会有帮助的，假如不是下面的知识也可以为你提供参考，对于</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><A href="http://pcbliumin.blog.resin.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>设计</SPAN></SPAN></A></SPAN></B><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">新手来说，开始根本就无从下手，下面就为你提供一个步骤，你只要按它做就可以了。</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt"></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">确定</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><A href="http://pcbsky.xinwen520.net/"><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; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">尺寸、形状；确定特殊元件的位置；确定普通元器件位置；尝试布线；修改布局；布设短线；布设长线；优化电源线；工艺设计；标注与文字。</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt"></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">可以借助</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt">PROTEL</SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">等</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt"><A href="http://pcblm.pcclub.pconline.com.cn/"><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; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; text-underline: none"><SPAN lang=EN-US>辅助设计软件</SPAN></SPAN></B></A></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，辅助完成布线设计。</SPAN>]]></description>
            <author>kenny_pcb</author>
            <comments>http://blog.ifeng.com/article/1493650.html#comment</comments>
            <pubDate>Tue, 03 Jun 2008 14:16:30 +0800</pubDate>
            <guid>1493650</guid>
        </item>
                <item>
            <title><![CDATA[用时域串扰测量法验证pcb质量]]></title>
            <link>http://blog.ifeng.com/article/1493646.html</link>
            <description><![CDATA[<P class=MsoNormal style="MARGIN: 10.2pt 0cm; LINE-HEIGHT: 160%; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><SPAN style="FONT-SIZE: 9pt; LINE-HEIGHT: 160%; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">本文讨论了串扰的组成，并向读者展示了如何利用<SPAN lang=EN-US>Tektronix</SPAN>的<SPAN lang=EN-US>TDS8000B</SPAN>系列采样示波器或<SPAN lang=EN-US>CSA8000B</SPAN>系列通讯讯号分析仪来测量单面<SPAN lang=EN-US><A href="http://www.dmpcb.cn/"><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black; TEXT-DECORATION: none; text-underline: none"><SPAN lang=EN-US>抄</SPAN></SPAN></B><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black; TEXT-DECORATION: none; text-underline: none"><SPAN lang=EN-US>板</SPAN></SPAN></B></A></SPAN>上的串扰。</SPAN><P class=MsoNormal style="MARGIN: 10.2pt 0cm; LINE-HEIGHT: 160%; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><SPAN style="FONT-SIZE: 9pt; LINE-HEIGHT: 160%; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">　　随着通讯、视讯、网络和计算机技术领域中数字系统的执行速度日益加速，对此类系统中的印刷电路板的质量要求也越来越高。早期的<SPAN lang=EN-US><A href="http://www.pcb-ic.com/"><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; TEXT-DECORATION: none; text-underline: none"><SPAN lang=EN-US>设计</SPAN></SPAN></B></A></SPAN>在面临讯号频率日益增高和脉冲上升时间日益缩短的情况下，已无法保证系统性能和工作要求。在目前的<SPAN lang=EN-US><A href="http://www.pcblab.net/PCB/SheJi"><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; TEXT-DECORATION: none; text-underline: none"><SPAN lang=EN-US>设计</SPAN></SPAN></B></A></SPAN>中，我们必须利用传输线理论对<SPAN lang=EN-US><A href="http://www.pcbinf.com/"><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; TEXT-DECORATION: none; text-underline: none"><SPAN lang=EN-US>抄板</SPAN></SPAN></B></A></SPAN>及其组件<SPAN lang=EN-US>(</SPAN>边缘连接器、微带线和零组件插座<SPAN lang=EN-US>)</SPAN>进行建模。只有充分了解<SPAN lang=EN-US><A href="http://www.pcblab.net/PCB/ChaoBan"><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; TEXT-DECORATION: none; text-underline: none"><SPAN lang=EN-US>抄板</SPAN></SPAN></B></A></SPAN>上串扰产生的形式、机制和后果，并采用相应技术最大程度地加以抑制，才能帮助我们提高包含<SPAN lang=EN-US><A href="http://blog.ednchina.com/liuminpcb"><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; TEXT-DECORATION: none; text-underline: none"><SPAN lang=EN-US>抄板</SPAN></SPAN></B></A></SPAN>在内的 ……<br/><br/>……</SPAN><P class=MsoNormal style="MARGIN: 10.2pt 0cm; LINE-HEIGHT: 160%; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 10.2pt 0cm; LINE-HEIGHT: 160%; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 10.2pt 0cm; LINE-HEIGHT: 160%; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 10.2pt 0cm; LINE-HEIGHT: 160%; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 10.2pt 0cm; LINE-HEIGHT: 160%; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 10.2pt 0cm; LINE-HEIGHT: 160%; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 10.2pt 0cm; LINE-HEIGHT: 160%; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 10.2pt 0cm; LINE-HEIGHT: 160%; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 10.2pt 0cm; LINE-HEIGHT: 160%; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 10.2pt 0cm; LINE-HEIGHT: 160%; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 10.2pt 0cm; LINE-HEIGHT: 160%; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt">]]></description>
            <author>kenny_pcb</author>
            <comments>http://blog.ifeng.com/article/1493646.html#comment</comments>
            <pubDate>Tue, 03 Jun 2008 14:15:09 +0800</pubDate>
            <guid>1493646</guid>
        </item>
                <item>
            <title><![CDATA[关于pcb设计布局的知识探讨]]></title>
            <link>http://blog.ifeng.com/article/1457001.html</link>
            <description><![CDATA[<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">本文的关键词：</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: ˎ̥">pcb</SPAN></B><B style="mso-bidi-font-weight: normal"><SPAN style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">设计</SPAN></B><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥"><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black">pcb</SPAN></B></SPAN><B style="mso-bidi-font-weight: normal"><SPAN style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">抄板</SPAN></B><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">在</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥"><A href="http://www.pcbwork.net/pcbsj.asp"><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: ˎ̥; mso-hansi-font-family: ˎ̥"><SPAN lang=EN-US>设计</SPAN></SPAN></B></A></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">中，布局是一个重要的环节。布局结果的好坏将直接影响布线的效果，因此可以这样认为，合理的布局是</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥"><A href="http://www.pcbsj.com/"><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: ˎ̥; mso-hansi-font-family: ˎ̥"><SPAN lang=EN-US>设计</SPAN></SPAN></B></A></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">成功的第一步。</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥"></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">布局的方式分两种，一种是交互式布局，另一种是自动布局，一般是在自动布局的基础上用交互式布局进行调整，在布局时还可根据走线的情况对门电路进行再分配，将两个门电路进行交换，使其成为便于布线的最佳布局。在布局完成后，还可对</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥"><A href="http://www.dmpcb.cn/"><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: ˎ̥; mso-hansi-font-family: ˎ̥"><SPAN lang=EN-US>设计</SPAN></SPAN></B></A></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">文件及有关信息进行返回标注于原理图，使得</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥"><A href="http://www.pcbwork.net/pcbcb.asp"><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: ˎ̥; mso-hansi-font-family: ˎ̥"><SPAN lang=EN-US>抄板</SPAN></SPAN></B></A></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">中的有关信息与原理图相一致，以便在今后的建档、更改设计能同步起来</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥">, </SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">同时对模拟的有关信息进行更新，使得能对电路的电气性能及功能进行板级验证。</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥"></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">考虑整体美观</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥"></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">一个产品的 ……<br/><br/>……</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥"></SPAN>]]></description>
            <author>kenny_pcb</author>
            <comments>http://blog.ifeng.com/article/1457001.html#comment</comments>
            <pubDate>Sat, 17 May 2008 09:14:52 +0800</pubDate>
            <guid>1457001</guid>
        </item>
                <item>
            <title><![CDATA[ 引起pcb抄板的细丝短路的原因与解决办法？]]></title>
            <link>http://blog.ifeng.com/article/1456997.html</link>
            <description><![CDATA[<P class=MsoNormal style="MARGIN: 10.2pt 0cm; LINE-HEIGHT: 160%; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><SPAN style="FONT-SIZE: 9.5pt; LINE-HEIGHT: 160%; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">在<SPAN lang=EN-US>PCB O/S</SPAN>测试和<SPAN lang=EN-US>AOI</SPAN>检测时﹐会在<SPAN lang=EN-US><A href="http://www.pcblab.net/PCB/ChaoBan"><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; TEXT-DECORATION: none; text-underline: none"><SPAN lang=EN-US>抄板</SPAN></SPAN></B></A></SPAN>的最外层﹐绿漆下发现一种短路﹐我们叫做细丝短路﹐因为短路的位置目视看起来有点象一跟细丝﹐歪歪扭扭的﹐切片看起来主要是铜﹐与正常的铜面长在一起﹐次类缺点的危害很大。</SPAN><P class=MsoNormal style="MARGIN: 10.2pt 0cm; LINE-HEIGHT: 160%; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><SPAN lang=EN-US style="FONT-SIZE: 9.5pt; LINE-HEIGHT: 160%; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">1</SPAN><SPAN style="FONT-SIZE: 9.5pt; LINE-HEIGHT: 160%; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">﹑因为在<SPAN lang=EN-US><A href="http://blog.csdn.net/liuminpcb"><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; TEXT-DECORATION: none; text-underline: none"><SPAN lang=EN-US>抄板</SPAN></SPAN></B></A></SPAN>上的有些细丝并不是完全造成短路﹐可能在客户上锡之后才造成短路﹐所以<SPAN lang=EN-US>O/S</SPAN>测试很容易漏失﹐流到客户手里。<SPAN lang=EN-US>2</SPAN>﹑因为有些细丝非常细﹐在覆盖绿漆后即使测试发现短路﹐但是修补人员不容易找到缺点位置﹐无法修补而报废。</SPAN><P class=MsoNormal style="MARGIN: 10.2pt 0cm; LINE-HEIGHT: 160%; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><SPAN style="FONT-SIZE: 9.5pt; LINE-HEIGHT: 160%; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">对于此类缺点的改善﹐可能需要很多方面去着手﹕本人认为主要在﹕<SPAN lang=EN-US>1</SPAN>﹑电镀﹐电镀时候如果槽中有细丝型的异物﹐可能会在电镀过程中吸附到班面﹐镀铜﹐镀锡后最终形成短路。<SPAN lang=EN-US>2</SPAN>﹑也 ……<br/><br/>……<SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN></SPAN><P class=MsoNormal style="MARGIN: 10.2pt 0cm; LINE-HEIGHT: 160%; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><SPAN style="FONT-SIZE: 9.5pt; LINE-HEIGHT: 160%; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt"><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN></SPAN><P class=MsoNormal style="MARGIN: 10.2pt 0cm; LINE-HEIGHT: 160%; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><SPAN style="FONT-SIZE: 9.5pt; LINE-HEIGHT: 160%; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt"><SPAN lang=EN-US></SPAN></SPAN><P class=MsoNormal style="MARGIN: 10.2pt 0cm; LINE-HEIGHT: 160%; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt">]]></description>
            <author>kenny_pcb</author>
            <comments>http://blog.ifeng.com/article/1456997.html#comment</comments>
            <pubDate>Sat, 17 May 2008 09:13:46 +0800</pubDate>
            <guid>1456997</guid>
        </item>
                <item>
            <title><![CDATA[PCB网友问题解囊]]></title>
            <link>http://blog.ifeng.com/article/1432512.html</link>
            <description><![CDATA[<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: ˎ̥"><A href="http://pcbliumin.pcclub.pconline.com.cn/"><SPAN style="COLOR: black; TEXT-DECORATION: none; text-underline: none">PCB</SPAN></A></SPAN></B><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">网友问题解囊</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥">1.</SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">为何最后生成的</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥"><A href="http://www.pcbwork.net/pcbcb.asp"><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: ˎ̥; mso-hansi-font-family: ˎ̥"><SPAN lang=EN-US>抄板</SPAN></SPAN></B></A></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">制版图与原理图不相符</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥"></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">答：这种情况很容易发生。确实原理图上很明显是连上的，由于画线不符合规范。导致生成的网络表中它们并未连上</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥"></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">下面的连线属于不规范的连线：</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥">a.</SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">超过元器件的端点连线</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥"> b.</SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">连线的两部分有重复</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥">2.protel99</SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">中如何将隐藏的</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥">DESIGNOR</SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">元件号重新找出来</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥"></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">答：在</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥">SCH</SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">中，双击元件，在对话框中选中</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥">Hidden Fields</SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">和</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥">Field Names,</SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">然后分别双击序号</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥">Text</SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">和参数</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥">Type,</SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">将其中的</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥">Hide</SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">的勾去。最后在双击元件，在对话框中</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥">Hidden Fields</SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">和</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥">Field Names</SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">把勾去掉。</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥">3.protel99</SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">中如何用</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥">“</SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">全局功能</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥">”</SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">将没有封 ……<br/><br/>……</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ˎ̥"></SPAN>]]></description>
            <author>kenny_pcb</author>
            <comments>http://blog.ifeng.com/article/1432512.html#comment</comments>
            <pubDate>Mon, 05 May 2008 12:17:03 +0800</pubDate>
            <guid>1432512</guid>
        </item>
                <item>
            <title><![CDATA[抄板与防抄板技术]]></title>
            <link>http://blog.ifeng.com/article/1420716.html</link>
            <description><![CDATA[<P class=0 style="TEXT-JUSTIFY: inter-ideograph; BACKGROUND: white; MARGIN: auto 0cm; LAYOUT-GRID-MODE: char; TEXT-INDENT: 25.4pt; LINE-HEIGHT: 21pt; TEXT-ALIGN: justify; mso-char-indent-count: 2.42"><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'">“</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; COLOR: black; mso-bidi-font-family: 'Times New Roman'"><A href="http://www.pcbwork.net/pcbcb.asp"><SPAN lang=EN-US style="COLOR: black; TEXT-DECORATION: none; text-underline: none"><SPAN lang=EN-US><FONT face=宋体>抄板</FONT></SPAN></SPAN></A></SPAN></B><FONT face=宋体><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; mso-bidi-font-family: 'Times New Roman'">”</SPAN><SPAN style="FONT-SIZE: 10.5pt; mso-bidi-font-family: 'Times New Roman'">与<SPAN lang=EN-US>“</SPAN>防</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; COLOR: black"><A href="http://pcbliumin.web.17jzw.com/"><SPAN style="COLOR: black; TEXT-DECORATION: none; text-underline: none">PCB</SPAN><SPAN lang=EN-US style="COLOR: black; TEXT-DECORATION: none; mso-bidi-font-family: 'Times New Roman'; text-underline: none"><SPAN lang=EN-US>抄板</SPAN></SPAN></A></SPAN></B><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; mso-bidi-font-family: 'Times New Roman'">”</SPAN><SPAN style="FONT-SIZE: 10.5pt; mso-bidi-font-family: 'Times New Roman'">正好如同坦克的<SPAN lang=EN-US>“</SPAN>火力<SPAN lang=EN-US>”</SPAN>与<SPAN lang=EN-US>“</SPAN>装甲<SPAN lang=EN-US>”</SPAN>一样<SPAN lang=EN-US>, </SPAN>火力追求破坏所有装甲<SPAN lang=EN-US>,</SPAN>装甲追求阻挡所有火力<SPAN lang=EN-US>,</SPAN>但是火力与装甲的有机结合<SPAN lang=EN-US>,</SPAN>造就了一个陆战之王<SPAN lang=EN-US>! </SPAN></SPAN></FONT><P class=0 style="TEXT-JUSTIFY: inter-ideograph; BACKGROUND: white; MARGIN: auto 0cm; LAYOUT-GRID-MODE: char; TEXT-INDENT: 15pt; LINE-HEIGHT: 21pt; TEXT-ALIGN: justify"><FONT face=宋体><SPAN style="FONT-SIZE: 10.5pt; mso-bidi-font-family: 'Times New Roman'">知道如何<B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black"><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; TEXT-DECORATION: none; text-underline: none"><SPAN lang=EN-US>抄板</SPAN></SPAN></A></SPAN></B>就好进行防<B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black"><A href="http://www.pcbinf.com/"><SPAN style="COLOR: black; TEXT-DECORATION: none; text-underline: none">pcb</SPAN><SPAN lang=EN-US style="COLOR: black; TEXT-DECORATION: none; text-underline: none"><SPAN lang=EN-US>抄板</SPAN></SPAN></A></SPAN></B><SPAN lang=EN-US>,</SPAN>反之亦然<SPAN lang=EN-US>. </SPAN>知道</SPAN><SPAN style="FONT-SIZE: 10.5pt">如何</SPAN><SPAN style="FONT-SIZE: 10.5pt; mso-bidi-font-family: 'Times New Roman'">防<B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black"><A href="http://www.pcblab.net/"><SPAN style="COLOR: black; TEXT-DECORATION: none; text-underline: none">pcb</SPAN><SPAN lang=EN-US style="COLOR: black; TEXT-DECORATION: none; text-underline: none"><SPAN lang=EN-US>抄板</SPAN></SPAN></A></SPAN></B></SPAN><SPAN style="FONT-SIZE: 10.5pt">就好进行</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; COLOR: black; FONT-FAMILY: ˎ̥"><A href="http://www.lrpcb.cn/"><SPAN class=15><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 宋体; TEXT-DECORATION: none; text-underline: none">PCB</SPAN></SPAN><SPAN class=15><SPAN lang=EN-US style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 宋体; TEXT-DECORATION: none; text-underline: none"><SPAN lang=EN-US>抄板</SPAN></SPAN></SPAN></A></SPAN></B><SPAN style="FONT-SIZE: 10.5pt">。</SPAN></FONT><P class=0 style="TEXT-JUSTIFY: inter-ideograph; BACKGROUND: white; MARGIN: auto 0cm; LAYOUT-GRID-MODE: char; TEXT-INDENT: 15pt; LINE-HEIGHT: 21pt; TEXT-ALIGN: justify"><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; COLOR: black; FONT-FAMILY: ˎ̥"><A href="http://www.pcbwork.net/"><SPAN class=15><SPAN lang=EN-US style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 宋体; TEXT-DECORATION: none; text-underline: none"><SPAN lang=EN-US>龙人计算机</SPAN></SPAN></SPAN></A></SPAN></B><FONT face=宋体><SPAN style="FONT-SIZE: 10.5pt">（深圳龙人计算机有限公司拥有<B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black"><A href="http://liuminpcb.bokee.com/"><SPAN style="COLOR: black; TEXT-DECORATION: none; text-underline: none">PCB</SPAN><SPAN lang=EN-US style="COLOR: black; TEXT-DECORATION: none; text-underline: none"><SPAN lang=EN-US>抄板工作室</SPAN></SPAN></A></SPAN></B>、</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; COLOR: black; FONT-FAMILY: ˎ̥"><A href="http://www.pcb-ic.com/"><SPAN class=15><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 宋体; TEXT-DECORATION: none; text-underline: none">PCB</SPAN></SPAN><SPAN class=15><SPAN lang=EN-US style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 宋体; TEXT-DECORATION: none; text-underline: none"><SPAN lang=EN-US>设计工作室</SPAN></SPAN></SPAN></A></SPAN></B><SPAN style="FONT-SIZE: 10.5pt">、<B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black"><A href="http://x.zuihao.biz/?36694"><SPAN lang=EN-US style="COLOR: black; TEXT-DECORATION: none; text-underline: none"><SPAN lang=EN-US>芯片解密</SPAN></SPAN></A></SPAN></B>工作室，龙人从事<SPAN lang=EN-US>PCB</SPAN>行业多年，<B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black"><A href="http://liuminpcb.blog.nnsky.com/"><SPAN style="COLOR: black; TEXT-DECORATION: none; text-underline: none">PCB</SPAN><SPAN lang=EN-US style="COLOR: black; TEXT-DECORATION: none; text-underline: none"><SPAN lang=EN-US>设计</SPAN></SPAN></A></SPAN></B>经验。专业提供<B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black"><A href="http://blog.9you.com/liuminpcb"><SPAN style="COLOR: black; TEXT-DECORATION: none; text-underline: none">PCB</SPAN><SPAN lang=EN-US style="COLOR: black; TEXT-DECORATION: none; text-underline: none"><SPAN lang=EN-US>抄板/</SPAN></SPAN><SPAN lang=EN-US style="COLOR: black; TEXT-DECORATION: none; text-underline: none"><SPAN lang=EN-US>改板</SPAN></SPAN></A></SPAN></B>、<B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black"><A href="http://liuminpcb.sogua.com/"><SPAN style="COLOR: black; TEXT-DECORATION: none; text-underline: none">PCB</SPAN><SPAN lang=EN-US style="COLOR: black; TEXT-DECORATION: none; text-underline: none"><SPAN lang=EN-US>设计/Layout</SPAN></SPAN></A></SPAN></B>、<B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black"><A href="http://blog.tom.com/liuminpcb/"><SPAN lang=EN-US style="COLOR: black; TEXT-DECORATION: none; text-underline: none"><SPAN lang=EN-US>芯片解密</SPAN></SPAN></A></SPAN></B><SPAN lang=EN-US>/IC</SPAN>解密和<SPAN lang=EN-US>SMT</SPAN>贴片加工<SPAN lang=EN-US>/</SPAN>样机制作服务。详情见：</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; COLOR: black; FONT-FAMILY: ˎ̥"><A href="http://www.pcb-ic.com/"><SPAN class=15><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 宋体; TEXT-DECORATION: none; text-underline: none">http://www.pcb-ic.com</SPAN></SPAN></A></SPAN></B><SPAN style="FONT-SIZE: 10.5pt">）写</SPAN><SPAN style="FONT-SIZE: 10.5pt; mso-bidi-font-family: 'Times New Roman'">本</SPAN><SPAN style="FONT-SIZE: 10.5pt">文</SPAN><SPAN style="FONT-SIZE: 10.5pt; mso-bidi-font-family: 'Times New Roman'">的目的也是让咱们中国电子工程师</SPAN><SPAN style="FONT-SIZE: 10.5pt">（尤其是<B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black"><A href="http://pcbliumin.sohoxiaobao.com/"><SPAN style="COLOR: black; TEXT-DECORATION: none; text-underline: none">PCB</SPAN><SPAN lang=EN-US style="COLOR: black; TEXT-DECORATION: none; text-underline: none"><SPAN lang=EN-US>抄板</SPAN></SPAN></A></SPAN></B>和<SPAN lang=EN-US>PCB</SPAN>设计 ……<br/><br/>……</SPAN></FONT>]]></description>
            <author>kenny_pcb</author>
            <comments>http://blog.ifeng.com/article/1420716.html#comment</comments>
            <pubDate>Mon, 28 Apr 2008 14:35:32 +0800</pubDate>
            <guid>1420716</guid>
        </item>
                <item>
            <title><![CDATA[影响pcb抄板企业的主要成本控制因素]]></title>
            <link>http://blog.ifeng.com/article/1406573.html</link>
            <description><![CDATA[<P style="BACKGROUND: #fcfcfc; MARGIN: 5pt 7.5pt 5pt -10.5pt; LINE-HEIGHT: 18.75pt"><B><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: ˎ̥"><A href="http://www.pcbwork.net/pcbcb.asp"><FONT size=3><FONT face=宋体><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: ˎ̥; mso-hansi-font-family: ˎ̥"><SPAN lang=EN-US>抄板</SPAN></SPAN></FONT></FONT></A></SPAN></B><FONT size=3><FONT face=宋体><B><SPAN style="COLOR: black; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">企业的成本控制因素</SPAN></B></FONT></FONT><P style="BACKGROUND: #fcfcfc; MARGIN: 5pt 7.5pt 5pt -10.5pt; LINE-HEIGHT: 18.75pt"><FONT face=宋体><SPAN style="FONT-SIZE: 10.5pt; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">　</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; COLOR: black; FONT-FAMILY: ˎ̥"><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; text-underline: none; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥"><SPAN lang=EN-US>抄板</SPAN></SPAN></A></SPAN></B><SPAN style="FONT-SIZE: 10.5pt; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">企业多数都是由小到大，碰上了九十年代。电子行业在广东飞速发展，因此</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; COLOR: black; FONT-FAMILY: ˎ̥"><A href="http://www.pcbinf.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: ˎ̥; mso-hansi-font-family: ˎ̥"><SPAN lang=EN-US>抄板</SPAN></SPAN></A></SPAN></B><SPAN style="FONT-SIZE: 10.5pt; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">企业也得以迅速扩展，只要是企业的经营是正当向上的，数都得到迅猛发展，以笔者所有的几家公司，均是从简单的设施，甚至旧的设备做起，不断扩充，由几十人的小作坊，做到目前几百人上千人的企业。发陈旧的旧设备到目前先进的自动生产线，从单一的</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; COLOR: black; FONT-FAMILY: ˎ̥"><A href="http://liuminpcb.bokee.com/"><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: 宋体; TEXT-DECORATION: none; text-underline: none; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥"><SPAN lang=EN-US>抄板</SPAN></SPAN></A></SPAN></B><SPAN style="FONT-SIZE: 10.5pt; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">到目前的碳墨、贯孔、假双面、印制板，产量以</SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: ˎ̥">1</SPAN><SPAN style="FONT-SIZE: 10.5pt; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">万</SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: ˎ̥">m2</SPAN><SPAN style="FONT-SIZE: 10.5pt; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">上升到十几万</SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: ˎ̥">m2</SPAN><SPAN style="FONT-SIZE: 10.5pt; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">；而一些经营不当、思想保守的公司，在只看重短期的高额利润，没有看到可持续发展，以致于停滞不前，不仅在人才方面、设备投入方面、均跟不上时代，一但竞争激烈，就处于破产的地步。</SPAN></FONT><P style="BACKGROUND: #fcfcfc; MARGIN: 5pt 7.5pt; LINE-HEIGHT: 18.75pt"><FONT face=宋体><SPAN style="FONT-SIZE: 10.5pt; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">　　</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; COLOR: black; FONT-FAMILY: ˎ̥"><A href="http://pcb007.xinwen520.net/"><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: 宋体; TEXT-DECORATION: none; text-underline: none; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥"><SPAN lang=EN-US>抄板</SPAN></SPAN></A></SPAN></B><SPAN style="FONT-SIZE: 10.5pt; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">的高利润 ……<br/><br/>……</SPAN></FONT><P style="BACKGROUND: #fcfcfc; MARGIN: 5pt 7.5pt; LINE-HEIGHT: 18.75pt"><P style="BACKGROUND: #fcfcfc; MARGIN: 5pt 7.5pt; LINE-HEIGHT: 18.75pt"><P style="BACKGROUND: #fcfcfc; MARGIN: 5pt 7.5pt; LINE-HEIGHT: 18.75pt"><P style="BACKGROUND: #fcfcfc; MARGIN: 5pt 7.5pt; LINE-HEIGHT: 18.75pt"><P style="BACKGROUND: #fcfcfc; MARGIN: 5pt 7.5pt; LINE-HEIGHT: 18.75pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt">]]></description>
            <author>kenny_pcb</author>
            <comments>http://blog.ifeng.com/article/1406573.html#comment</comments>
            <pubDate>Mon, 21 Apr 2008 14:12:06 +0800</pubDate>
            <guid>1406573</guid>
        </item>
                <item>
            <title><![CDATA[pcb设计的问与答]]></title>
            <link>http://blog.ifeng.com/article/1406566.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'">、在高速</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/pcbsj.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: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><SPAN lang=EN-US>设计</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'">中，如何解决信号的完整性问题？</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'">信号完整性基本上是阻抗匹配的问题。而影响阻抗匹配的因素有信号源的架构和输出阻抗</SPAN><SPAN lang=EN-US>(output impedance)</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，走线的特性阻抗，负载端的特性，走线的拓朴</SPAN><SPAN lang=EN-US>(topology)</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">架构等。解决的方式是靠端接</SPAN><SPAN lang=EN-US>(termination)</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">与调整走线的拓朴。</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><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'">、在高速</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.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; text-underline: none; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><SPAN lang=EN-US>设计</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'">中，信号层的空白区域可以敷铜，而多个信号层的敷铜在接地和接电源上应如何分配？</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'">一般在空白区域的敷铜绝大部分情况是接地。</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">只是在高速信号线旁敷铜时要注意敷铜与信号线的距离，</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">因为所敷的铜会降低一点走线的特性阻抗。</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">也要注意不要影响到它层的特性阻抗，</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">例如在</SPAN><SPAN lang=EN-US> dual strip line </SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的结构 ……<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>kenny_pcb</author>
            <comments>http://blog.ifeng.com/article/1406566.html#comment</comments>
            <pubDate>Mon, 21 Apr 2008 14:11:06 +0800</pubDate>
            <guid>1406566</guid>
        </item>
                <item>
            <title><![CDATA[PCB设计指南]]></title>
            <link>http://blog.ifeng.com/article/1399823.html</link>
            <description><![CDATA[<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align=center><B><SPAN lang=EN-US style="FONT-SIZE: 12pt; COLOR: black; FONT-FAMILY: 宋体"><A href="http://www.pcbwork.net/pcbsj.asp"><SPAN style="COLOR: black">PCB</SPAN><SPAN lang=EN-US style="COLOR: black"><SPAN lang=EN-US>设计</SPAN></SPAN></A></SPAN></B><SPAN style="FONT-SIZE: 12pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-weight: bold">指南</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 24.1pt; mso-char-indent-count: 2.0"><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="FONT-SIZE: 12pt; COLOR: black; FONT-FAMILY: 宋体"><A href="http://www.pcbwork.net/"><SPAN style="COLOR: black">PCB</SPAN><SPAN lang=EN-US style="COLOR: black"><SPAN lang=EN-US>设计</SPAN></SPAN></A></SPAN></B><SPAN style="FONT-SIZE: 12pt; COLOR: black; FONT-FAMILY: 宋体">会对下面三种效应都产生影响：</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 24pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-SIZE: 12pt; COLOR: black; FONT-FAMILY: 宋体">1. </SPAN><SPAN style="FONT-SIZE: 12pt; COLOR: black; FONT-FAMILY: 宋体">静电放电之前静电场的效应<SPAN lang=EN-US></SPAN>　　<SPAN lang=EN-US>2. </SPAN>放电产生的电荷注入效应<SPAN lang=EN-US></SPAN>　　<SPAN lang=EN-US>3. </SPAN>静电放电电流产生的场效应<SPAN lang=EN-US></SPAN>　　但是，主要是对第三种效应产生影响。下面的讨论将针对第三条所述的问题给出设计指南。<SPAN lang=EN-US></SPAN>　　通常，源于接收电路之间的场耦合可以通过下列方式之一减小：<SPAN lang=EN-US></SPAN>　　<SPAN lang=EN-US>1. </SPAN>在源端使用滤波器以衰减信号<SPAN lang=EN-US></SPAN>　　<SPAN lang=EN-US>2. </SPAN>在接收端使用滤波器以衰减信号<SPAN lang=EN-US></SPAN>　　<SPAN lang=EN-US>3. </SPAN>增加距离以减小耦合<SPAN lang=EN-US></SPAN>　　<SPAN lang=EN-US>4. </SPAN>降低源和<SPAN lang=EN-US>/</SPAN>或接收电路的天线效果以减小耦合<SPAN lang=EN-US></SPAN>　　<SPAN lang=EN-US>5. </SPAN>将接收天线与发射天线垂直放置以减小耦合<SPAN lang=EN-US></SPAN>　　<SPAN lang=EN-US>6. </SPAN>在接收天线与发射天线之间加屏蔽<SPAN lang=EN-US></SPAN>　　<SPAN lang=EN-US>7. </SPAN>减小发射及接收天线的阻抗来减小电场耦合<SPAN lang=EN-US></SPAN>　　<SPAN lang=EN-US>8. </SPAN>增加发射或 ……<br/><br/>……<SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN></SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt">]]></description>
            <author>kenny_pcb</author>
            <comments>http://blog.ifeng.com/article/1399823.html#comment</comments>
            <pubDate>Fri, 18 Apr 2008 09:14:13 +0800</pubDate>
            <guid>1399823</guid>
        </item>
                <item>
            <title><![CDATA[关于PCB设计材料的选择探讨]]></title>
            <link>http://blog.ifeng.com/article/1399821.html</link>
            <description><![CDATA[<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体">关于</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><A href="http://www.pcbwork.net/pcbsj.asp"><SPAN style="COLOR: black">PCB</SPAN><SPAN lang=EN-US style="COLOR: black"><SPAN lang=EN-US>设计</SPAN></SPAN></A></SPAN></B><SPAN style="FONT-FAMILY: 宋体">材料的选择探讨</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体">通常，</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><A href="http://www.pcbwork.net/"><SPAN style="COLOR: black">PCB</SPAN><SPAN lang=EN-US style="COLOR: black"><SPAN lang=EN-US>设计</SPAN></SPAN></A></SPAN></B><SPAN style="FONT-FAMILY: 宋体">对于<SPAN lang=EN-US>—</SPAN>般的电子产品采用<SPAN lang=EN-US>FR4</SPAN>环氧玻璃纤维基板，对于使用环境温度较高或挠性电路板采用聚酰亚胺玻璃纤维基板，对于高频</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><A href="http://www.dmpcb.cn/"><SPAN style="COLOR: black">PCB</SPAN><SPAN lang=EN-US style="COLOR: black"><SPAN lang=EN-US>设计</SPAN></SPAN></A></SPAN></B><SPAN style="FONT-FAMILY: 宋体">电路则需要采用聚四氟乙烯玻璃纤维基板；对于</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><A href="http://www.pcbinf.com/"><SPAN style="COLOR: black">PCB</SPAN><SPAN lang=EN-US style="COLOR: black"><SPAN lang=EN-US>设计</SPAN></SPAN></A></SPAN></B><SPAN style="FONT-FAMILY: 宋体">散热要求高的电子产品应采用金属基板</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><A href="http://wwwpcb.xinwen520.net/"><SPAN style="COLOR: black">PCB</SPAN><SPAN lang=EN-US style="COLOR: black"><SPAN lang=EN-US>设计</SPAN></SPAN></A></SPAN></B><SPAN style="FONT-FAMILY: 宋体">时，选择</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><A href="http://pcbliumin.sohoxiaobao.com/"><SPAN style="COLOR: black">PCB</SPAN></A></SPAN></B><SPAN style="FONT-FAMILY: 宋体">材料时应考虑的因素：<SPAN lang=EN-US></SPAN>　　<SPAN lang=EN-US>(1)</SPAN>应适当选择玻璃化转变温度<SPAN lang=EN-US>(Tg)</SPAN>较高的基材，<SPAN lang=EN-US>Tg</SPAN>应高于</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><A href="http://pcblab.xinwen520.net/"><SPAN style="COLOR: black">pcb</SPAN><SPAN lang=EN-US style="COLOR: black"><SPAN lang=EN-US>设计</SPAN></SPAN></A></SPAN></B><SPAN style="FONT-FAMILY: 宋体">电路工作温度。</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体">　　<SPAN lang=EN-US>(2)</SPAN>要求热膨胀系数<SPAN lang=EN-US>(CTE)</SPAN>低。由于<SPAN lang=EN-US>X</SPAN>、<SPAN lang=EN-US>Y</SPAN>和厚度方向的热膨胀系数不一致，容易造成<SPAN lang=EN-US>PCB</SPAN>变形，严重时会造成金属化孔断裂和损坏元件。</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体">　　<SPAN lang=EN-US>(3)</SPAN>要求耐热性高。一般要求</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><A href="http://liuminpcb.sogua.com/"><SPAN style="COLOR: black">PCB</SPAN><SPAN lang=EN-US style="COLOR: black"><SPAN lang=EN-US>抄板</SPAN></SPAN></A></SPAN></B><SPAN style="FONT-FAMILY: 宋体">能有<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="250" UnitName="℃"><SPAN lang=EN-US>250</SPAN>℃</st1:chmetcnv>／<SPAN lang=EN-US>50S</SPAN>的耐热性。</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体">　　<SPAN lang=EN-US>(4)</SPAN> ……<br/><br/>……</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt">]]></description>
            <author>kenny_pcb</author>
            <comments>http://blog.ifeng.com/article/1399821.html#comment</comments>
            <pubDate>Fri, 18 Apr 2008 09:13:42 +0800</pubDate>
            <guid>1399821</guid>
        </item>
                <item>
            <title><![CDATA[PCB设计者必知的几点技巧]]></title>
            <link>http://blog.ifeng.com/article/1399820.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"><A href="http://www.pcbwork.net/pcbsj.asp"><SPAN style="COLOR: black">PCB</SPAN><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><SPAN lang=EN-US>设计</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'">者必知的几点技巧</SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US style="FONT-FAMILY: 宋体">1</SPAN><SPAN style="FONT-FAMILY: 宋体">、</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black"><A href="http://www.pcbwork.net/"><SPAN style="COLOR: black">PCB</SPAN><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><SPAN lang=EN-US>设计</SPAN></SPAN></A></SPAN></B><SPAN style="FONT-FAMILY: 宋体">如何选择</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><A href="http://pcbliumin.sohoxiaobao.com/"><SPAN style="COLOR: black">PCB</SPAN><SPAN lang=EN-US style="COLOR: black"><SPAN lang=EN-US>抄</SPAN></SPAN><SPAN lang=EN-US style="COLOR: black"><SPAN lang=EN-US>板</SPAN></SPAN></A></SPAN></B><SPAN style="FONT-FAMILY: 宋体">材？<SPAN lang=EN-US></SPAN>选择</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><A href="http://pcbliumin.studentboss.com/"><SPAN style="COLOR: black">PCB</SPAN></A></SPAN></B><B style="mso-bidi-font-weight: normal"><SPAN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">抄板</SPAN></B><SPAN style="FONT-FAMILY: 宋体">材必须在满足设计需求和可量产性及成本中间取得平衡点。设计需求包含电气和机构这两部分。通常在设计非常高速的</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><A href="http://liuminpcb.sogua.com/"><SPAN style="COLOR: black">pcb</SPAN><SPAN lang=EN-US style="COLOR: black"><SPAN lang=EN-US>抄板</SPAN></SPAN></A></SPAN></B><SPAN lang=EN-US style="FONT-FAMILY: 宋体">(</SPAN><SPAN style="FONT-FAMILY: 宋体">大于<SPAN lang=EN-US>GHz</SPAN>的频率<SPAN lang=EN-US>)</SPAN>时这材质问题会比较重要。例如，现在常用的<SPAN lang=EN-US>FR-4</SPAN>材质，在几个<SPAN lang=EN-US>GHz</SPAN>的频率时的介质损<SPAN lang=EN-US>(dielectric loss)</SPAN>会对信号衰减有很大的影响，可能就不合用。就电气而言，要注意介电常数<SPAN lang=EN-US>(dielectric constant)</SPAN>和介质损在所设计的频率是否合用。<SPAN lang=EN-US>2</SPAN>、</SPAN><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="COLOR: black"><A href="http://www.lrpcb.cn/"><SPAN style="COLOR: black">PCB</SPAN><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><SPAN lang=EN-US>设计</SPAN></SPAN></A></SPAN></B><SPAN style="FONT-FAMILY: 宋体">如何避免高频干扰？<SPAN lang=EN-US></SPAN>避免高频干扰的基本思路是尽量降低高频信号电磁场的干扰，也就是所谓的串扰<SPAN lang=EN-US>(Crosstalk)</SPAN>。可用拉大 ……<br/><br/>……<SPAN lang=EN-US></SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体"><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体"><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体"><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体"><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN><SPAN lang=EN-US></SPAN></SPAN><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt">]]></description>
            <author>kenny_pcb</author>
            <comments>http://blog.ifeng.com/article/1399820.html#comment</comments>
            <pubDate>Fri, 18 Apr 2008 09:13:01 +0800</pubDate>
            <guid>1399820</guid>
        </item>
            </channel>
</rss>