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-5V底噪在200HZ,300HZ,400HZ有点偏高帮忙看下原因是啥?



电源采用TPS7A4901将24V转到5V,然后通过ICL7660转到-5V。

原理图:

-5V的底噪如上图,但是+5V没有,所以想问一下各位大侠这是由什么引起的?