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MFB高通滤波器出现带通现象

Other Parts Discussed in Thread: LM324

如上图所示,该MFB高通滤波器截止频率是100Hz,但调试发现当频率大于10kHz时,信号会出现衰减。为什么设计的高通滤波器会变成带通滤波器呢?

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