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用TINA-TI仿真ths4521异常

Other Parts Discussed in Thread: TINA-TI

用TINA-TI仿真一个低通全差分滤波器,发现直流工作点异常,请问这是什么原因呢?

见图,输出端的共模电压并不是期望的750mV lpf.TSC