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高速信号存在回沟现象，如何解决

Blacky
Prodigy 30 points

给光电二极管施加一个5V偏压，用来测高速信号。发现采集的方波信号存在回沟，这种现象是什么引起的呢？又该如何解决，求大佬帮忙。