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OPA4140作为buffer使用的问题

Other Parts Discussed in Thread: OPA4140

我将交流信号叠加一个2.5V的直流偏置后,将其接到OPA4140的作为电压跟随器使用的那级的输入端,结果在跟随器后端,当交流电压上升或下降经过2.3V时,会出现很多毛刺,请问是什么原因?