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关于LM49450输出

Other Parts Discussed in Thread: LM49450

我用LM49450做了两块板子,一块是DEMO板,一块是正式产品,发现LM49450耳放和Speak输出的声音中高频的声音不正常,用示波器量了一下,发现频率1KHZ左右及以上的波形有重叠的现象,以下就没有问题,请问这是什么原因导致的?