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AFE5801: 信号发生器产生的200kHz,200mVpp的方波在AFE5801输出的波形中耦合了一个同频率的正弦波,我该怎么去掉这个正弦波

Part Number: AFE5801

器件采用了AFE5801,信号采用单端输入,通过交流耦合进5801,采样率设置为50MHz,在SignalTap采到的波形如图。信号在通道一和通道二上。