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使用XTR111遇到输出噪声大的问题。

Other Parts Discussed in Thread: XTR111

sch如下图所示:

输入引脚示波器的波形:

输出接250R负载后的波形:

去掉了Q3,短接Q4的2,3引脚,输出的波形仍然如上图所示。

请教这是什么原因引起的噪声呢?