.一 差分信号的特点：图1 差分信号1. 差分信号是一对幅度相同，相位相反的信号。差分信号会以一个共模信号Vocm为中心，如图1所示。差分信号包含差模信号和公模信号两个部分，差模与公模的定义分别为：Vdiff=(Vout+-Vout-)/2，Vocm=(Vout+Vout-)/2。2. 差分信号的摆幅是单端信号的两倍。如图1，绿色表示的是单端信号的摆幅，而蓝色表示的是差分信号的摆幅。所以在同样电源电压供电条件下，使用差分信号增大了系统的动态范围。3. 差分信号可以抑制共模噪声，提高系统的信噪比。In a differential system, keeping the transport wires as close as possible to one another makes the noise coupled into the conductors appear as a common-mode voltage. Noise that is common to the power supplies will also appear as a comm
