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您好,TI工程师。该电路为I-V转换功能,U1、u2为不同通道,当u1与u2的输入存在等效电阻R3,问为什么不存在等效电阻时VOUT输出为零,当存在等效电阻时,Vout就输出电源电压?这是在实际电路中出现的问题。请问这是什么原因造成的?