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OPA2320零输入时输出波形异常问题

Other Parts Discussed in Thread: OPA2320

Hi大家好:

原理图如下图所示:

图中AD8539用OPA2320代替,用来测采样电流。在零输入的情况下测量输出,波形如下图:

请问为什么会出现这样的波形?可能是什么原因导致的?谢谢!