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关于AD采样位数的问题



您好,我想问下,在AD采样中,被采样的信号都是相对于地的电压信号,是不是我就把地电平当成稳稳的0V而不考虑地电平的波动,考虑的话应该怎么考虑?电源抑制比可以抑制电源线上的纹波噪声,地应该怎么考虑?差分数据采集中,可以靠芯片的共模抑制比来抑制地噪声,但是单端采样应该怎么考虑??