放大电路是一个双口网络，每个端口有两个端子，其端口结构示意图如左图所示。当两个输入端子的输入信号分别为vi1和vi2时，两信号的差值称为差模信号，而两信号的算术平均值称为共模信号。
... 共模信号 common-mode signal 差模信号 different-mode signal 上限截止频率 upper cut-off frequency ...
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...释，使学员们能够了解与课程大纲主题相关「SI/EMI Layout Guidelines的原理与成因，掀开高速「差模信号 (Differential Signals)的神秘面纱，一解您长久以来的些许疑惑，并借以建立正确的SI/EMI Layout设计观念。
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差分模信号 [电子] differential-mode signal
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翻译：测量是通过向双绞线注入差模信号(DM)，然后测量同一对双绞线返回的共模信号(CM)。
The measurement is made by injecting a differential mode signal (DM) into a twisted pair, then measuring the common mode signal (CM) returned on that same twisted pair.
回波损耗测试是通过向双绞线注入DM(差模信号)然后测试返回的DM信号，然而TCL是测试CM信号。
Except a return Loss measurement is made by injecting a DM signal into the pair and measuring the DM signal returned. Here we are measuring the CM signal returned which is TCL.
差模跟踪技术在低轨卫星下行信号接收中发挥着极其重要的作用。
The differential mode tracking technology plays an important role for receiving signal of low orbit satellites.
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