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OPA847 同相放大电路 输出一直是一个直流

Other Parts Discussed in Thread: OPA847

用OPA847搭了一个如图所示的差分放大电路,输入通过信号发生器给。结果输入不管给什么信号(三角波,正弦,直流等都试了),输出都是一个稳定的2V左右的直流电压。

求问,是什么原因。

谢谢