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ACF2101输入短路输出信号幅度很大

Other Parts Discussed in Thread: ACF2101, OPA227, OPA2107

附件是原理图和PCB文件。采用单片机给控制信号。

当输入短路时,输出信号幅度比较大。等效到输入约为2nA。ACF2101输入偏流的典型值为100fA。

这个可能是由什么原因引起的?

ACF2101电路.pdf