在使用芯片手册中的AGC环路时，我需要在低频300~5K是完成AGC，但是发现输出波形顶部失真严重，然后在opa820反馈支路中增加电容容值在并上电阻，发现波形还好，但是AGC的效果已经消失，输入幅值变化，输出会有变化，请问是什么原因
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