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关于有源低通滤波器中运放的开环增益与负反馈改善因子问题。

当一个运放作为有源低通滤波器时,其高频开环增益是不是会下降很多?比如同在20kHz处。

如果是的话,在其后面加入一个BUF,并接入反馈回路内,是不是负反馈对于BUF的非线性失真改善效果会比非LPF情况下差很多?