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pcb板布线宽度问题

我是用设计了一个带宽在10k~20M,增益40db的放大电路,信号幅值大约在零点几V。想问下绘制pcb板的时候各个线的宽度大约要到多少呢?有人说信号线10mil就够了,又有人说越宽越好,可是变宽后器件距离不是也变大了么。那么到底应该怎样选择呢?线宽的选择一般又与那些因素有关呢?网上、各教程众说纷坛,实在不知道听哪个好。谢谢!