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为什么半波精密检波电路在5khz以上频率为什么就会出现问题,请问是运放的问题吗?

Other Parts Discussed in Thread: OPA656

第一幅是电路图。第二副图是对1v、5khz正弦波进行检波时出现的波形,第三幅是仿真进行到339ms时出现的自激。第四幅改为了50khz时出现的波形,到4ms左右就会出现自激,为什么会产生上述情况?还有,我想能对0.24v、50khz的正弦波进行精密检波,请问怎么改?我用的是multisim10.0仿真软件。谢谢