关于共模 差模 差分区别

2025-03-17 02:20:34
推荐回答(1个)
回答1:

共模信号
共模信号是作用在差分放大器或仪表放大器同相、反相输入端的相同信号。例如,平衡线对中引入到两个平衡端的噪声电压。另外一个例子是加在平衡线上的直流电压(例如:由于信号源与接收器之间的地电位差而产生的直流电平)。
对于理想的差分放大器,可以完全消除共模信号输出,这是由于差分输入(同相和反相)抵消掉了相同的输入成分。衡量这一特性的参数称为共模抑制比或CMRR。
差模信号
又称为常模、串模、线间感应和对称信号等,在两线电缆传输回路,每一线对地电压用符号V1和V2来表示。差模信号分量是VDIFF。所有的差模电流(IDIFF)全流过负载。差模干扰侵入往返两条信号线,方向与信号电流方向一致,其一种是由信号源产生,另一种是传输过程中由电磁感应产生,它和信号串在一起且同相位,这种干扰一般比较难以抑制。

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