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关于在TINA-TI下仿真差分放大器THS4521的信号处理问题

Other Parts Discussed in Thread: THS4521, TINA-TI

请教大神,我想利用THS4521提取500K的正弦波绝对值信号,先搭了一个提取负值的电路。但是利用TINA-TI 仿真后的波形出现漂移(如下图),请教是什么原因?