电路图如上,SO1B采集的电流含电源纹波,SO2C采集的电流很平滑,在上图上增加的PVDD的两个电源电容,效果依然不明显。电路走线如图。
问题:将8301输出的SO1B,SO2C交换变成SO2C含纹波,所以判断,纹波从8301芯片内部传递出来。是什么原因造成25脚输出的信号含电源纹波???
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