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OPA855: 如何确定光电脉冲信号的带宽

Part Number: OPA855

请教一下专家,对于光电脉冲信号的带宽怎么计算?APD/SIPM这种光器件接收到激光脉冲后,形成了脉冲波形,这种波形不是标准正弦波形。请问这种脉冲信号的带宽是多大,如何选择后面放大器的带宽才能保证这个脉冲信号的不失真?