我用3.3V声称正负3V电源。发现负电源噪声太大，负电源-3V上输出上有3kHz左右的锯齿波，峰峰值40mV，手册上声称的是20uVRMS啊，差别太大了。刚开始怀疑负载的问题，现在把负载芯片全拆了还是这样，怎么回事，如何消除这个锯齿波？
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