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关于运放AD8671干扰240khz正弦波问题!!!

如图所示的电路,在没有接输入的时候,输出正常,在接入输入后过几秒钟后,输出过几秒后会有240khz的正弦波出现,正常情况下应该是没有的。请问下这是由于什么原因造成的?