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lm2902差分放大的调零问题



Vin1和Vin2都输入0.5V时,Vout最低输出大约0.05V;

Vin1和Vin2都输入1V时,Vout最低输出大约0.1V;

Vin1和Vin2都输入3.3V时,Vout最低输出大约0.6V;

输出无法调零,最低输出可达0.6V左右,要求在5V范围内,最低输出在0.1V以内。

怎么调零?请求指点。