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如图，信号进入ADC前，被比例缩小了4倍，比如±10V的输入信号，进ADC后变成±2.5V（加共模），想问下噪声会不会被同样缩小？如果不会，是否这种电路拓扑会降低系统的信噪比？感谢各位前辈回答。
亲；差模噪音会被衰。共模噪音不一定，比例也不一定一样。
