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PCB

名词解释题
2022-05-23 05:14
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正确答案
也就是主板线路板它由几层树脂材料粘合在一起的,内部采用铜箔走线。一般的PCB线路板分有四层,最上和最下的两层是信号层,中间两层是接地层和电源层,将接地和电源层放在中间,这样便可容易地对信号线做出修正。而好的主板的线路板可达到六层,这是由于信号线必须相距足够远的距离,以防止电磁干扰,六层板可能有三个或四个信号层、一个接地层、以及一个或两个电源层,以提供足够的电力供应。

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