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咨询运放LMC6061AIM实现I/V功能输出电压的问题

Other Parts Discussed in Thread: REF3025, LMC6061

你好!如图所示将直流0~1250.0nA通过运放转换成0~2.5V。在仿真2.5nA时输出电压多了0.35mV;在仿真25nA时输出电压同样多了0.35mV。请问如何消除这个多了的0.35mV?在实际电路中还有什么需要注意的地方?比如电源