一些layout会用到的

介质为FR4材料时:75Ω带状线,w=h/8;50Ω带状线,w=h/3;75Ω微带线,w=h;50Ω微带线,w=2h。

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许多单片机对电源噪声很敏感,要给单片机电源加滤波电路或稳压器,以减小电源噪声对单片机的干扰。比如,可以利用磁珠和电容组成π形滤波电路,当然条件要求不高时也可用100Ω电阻代替磁珠。

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注意高频电容的布线,连线应靠近电源端并尽量粗短,否则,等于增大了电容的等效串联电阻,会影响滤波效果。

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1/2盎司厚度的 一般40mil宽可承受1A电流

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如果1平方米的铜箔要使其重量为1金衡盎司,也就是31.1035克,则其厚度应该是31.1035/(8.9*100*1000)=35微米,即我们平时所说的做1盎司的PCB板,实际厚度就是1.4mil,即35微米,2盎司就是70微米.

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单位是inch

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posted @   Biiigfish  阅读(642)  评论(4编辑  收藏  举报
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