AZ，上次问过PCB问题，追问一下：
根据TI的CC2541+CC2590的板子，馈线的线宽是13mil（0.3302mm），覆铜距离差不多是40mil（1.016mm），这样用APPCAD算出来的阻抗不是50欧姆啊，差距也太大了，这是为什么？因为四层板和两层板不一样的原因吗？我准备画两层板
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