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噪声是电源直接耦合过去负载的吧?电源输出端直接filter吧,filter的截止频率要高于主要噪声的频率
在LMR62421的输出电容上并联小电容滤波,在负载芯片的供电端加RC滤波电路,适当选择RC参数,会有较好效果。