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OPA656: OPA656输出一个负电平

Part Number: OPA656

为什么我用OPA656跨阻放大,反馈电阻470Ω,反馈电容3pf,放大器输出接一个50Ω电阻到示波器,示波器输出的是一个直流电平,我给OPA656输入的是SIPM,应该输入的是一个电流脉冲,示波器为什么不能将电流脉冲变成一个电压脉冲,OPA656供电的是±5V