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输入或输出直流时纹波?



各位前辈好,本人最近发现一个问题,即通过示波器去测直流信号(如直流输出电源或者电路输出的直流信号)发现总存在峰峰值,这个Vpp一般的有80mv左右,有时候会达到160mv。不知道如何去减小这个纹波(是不是叫纹波啊?)