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LMV324放到方波输入输出不成比例

Other Parts Discussed in Thread: LMV324
输入
输出
IN是一个带直流分量的矩形波,经过RC之后,基本成了一个没有直流分量的矩形波,波形幅值高电平16.5mv,低电平接近0
经过运放放大之后还是一个矩形波,高电平大约是896mv,低电平720mv
请教一下,为什么运放输出不是高电平接近896mv,低电平是0 的矩形波呢?