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电路如图所示，当PD无光输入时（暗电流1nA以内），电路的输出output存在70mV左右的直流输出。理论上输出应该是uV量级，没有找到输出存在偏置的原因。
您好，
OPA855有12uA的偏置电流，这个偏置电流流过6.2K电阻就会产生74mV的电压：
