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OPA847 输入信号到700mVPP时,输出波形失真,怎么解决



用的电路就是datasheet上的测试电路,只不过放大倍数改成了5倍,实际只有2倍,还有就是6.8uf的电容换成了4.7uf的,现在的情况时,小信号比如说10mVpp-700mVpp,输出波形挺好,但是当输入信号再大时,输出信号就失真了,一个周期正常,第二个周期幅值就变小了,第三个周期又恢复了,然后依次循环。不知道是什么问题,一会拍个照片发上来