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脉冲信号放大后脉宽加倍的问题

Other Parts Discussed in Thread: OPA847

图一是电路图,输入信号是一个脉宽为100ns的脉冲信号,用OPA847座反向放大后,脉冲宽度大约在家了一倍,输入输出信号如图。还有就是如图三,放大后的输出信号有幅值为100mV的正弦震荡情况。不知能否给一些建议,万分感谢!