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BUF634缓冲器问题,输入输出含有较大直流成分,算正常吗?

Other Parts Discussed in Thread: BUF634

用三个BUF634并联构成一个缓冲器,理论增益为零,现在我的电路增益在-3db左右,输入输出波形都完美,但是输入输出含有较大直流分量,请问专家这算正常现象吗?

这是我的原理图:

这是输入输出波形: