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OPA2317输入端存在1mV的压差

Other Parts Discussed in Thread: OPA2317

用OPA2317做一个放大电路,R1与R7的电压差为36.871mV,RL电压为708.7mV,但运放的"+"与"-"有0.998mV的偏移,这一mV的压差直接造成了输出20多mV的误差。请问一下这个偏差是怎么产生的呢?这应该不是因为偏置电流所造成的影响吧?