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高速运放THS4222仿真的问题

Other Parts Discussed in Thread: THS4222

各位同仁,大家好:

最近使用TINA_TI做了一款高速运放THS4222的仿真工作,电路结构是简单的反向比例放大。结果发现输出的波形上自动叠加了一个负的直流偏置。且随着电阻值的增大,直流偏置相应增大,请问这是什么原因呢?(输入信号为2Vpp,100KHz的正弦波,运放供电电压为正负5V)以下是仿真电路