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？
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