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OPA818: 搭建TIA电路输入0V,啥输出会饱和;而不是0V?

Part Number: OPA818

您好,

如题,opa818搭建TIA时,输入为零,为啥输出会饱和呢?

因为我想排除下干扰源,所以想将输入端接到GND,看是否还有干扰。

但是实测发现输出居然会饱和,仿真结果一样的,所以想请教下原因。

谢谢!!