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跨阻放大器输出波形反向

Other Parts Discussed in Thread: OPA847

各位大家好,

                    手头正在做光电流跨阻放大器,选择的opa847片子。输入端接APD,输入信号如下图所示为正向脉冲,输出却得到如下图所示反向脉冲,不知道为什么?请高手指点。