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关于LM324的积分电路

Other Parts Discussed in Thread: LM324

如图,对小电阻r上的电压进行放大、积分。

u1:

u2输出:

当用理想运放替换两个LM324后

u1:

u2:

使用理想运放,积分结果很快稳定。使用LM324时,输出u2持续变化,基本正向饱和了。

请问是何种原因导致此状况,需如何修改电路呢