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单电源轨到轨的运算放大器是否必须提供负压才能到0V呢

Other Parts Discussed in Thread: OP07

 在AD采集前端我加轨到轨的运算放大器做电压跟随,目前遇到的情况是运放输入为0V时,输出总是有2mV 左右的电压输出,有什么办法消除这个电压么?

采用4路集成运放,外部输入模拟电压相同,但输出总是有1-3mV的差距,这是器件本身带来的么?