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。以局部共通端或者接地为参考，共模信号就在双线电缆的两根线上出现，幅度和相位都相同。很明显，当双线中的一根接到地时共模信号就不会出现。技术上共模电压是平衡电路各导体对地电压的向量和的一半，这种信号可由下面一个或者多个因素引起。
... common mode rejection ratio(CMRR),共模抑制比 common mode signal,共模信号 common mode voltage,共模电压 ...
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The common-mode transformer design is primary to sample common-mode current signal. After common-mode transformer transform the common-mode current of main circuit to voltage signal, analog-digital conversion and common-mode signal sampling can be carried out.
欲采集共模电流信号,首先需要设计共模变压器,将主电路输入端的共模电流通过耦合,转化为电压信号,才能进行模数转换和共模信号采样。
参考来源 - FPGA在共模噪声评估中的应用·2,447,543篇论文数据，部分数据来源于NoteExpress
这种类型的干扰一并来到两个差分输入端，因而出现一个共模信号。
This type of interference is induced equally into both differential inputs, and therefore appears as a common-mode signal.
为了提高前置级的共模抑制能力，采用了共模信号的抑制电路—右腿驱动和浮地跟踪。
The design adopts the circuit for constraining the in-phase signal, in order to improve the system's CMRR.
电路见图5，这种电路在运算电路中相当有用，比如差分对单端的转换，抑制共模信号。
This circuit is shown in Figure 5 and is useful as a computational amplifier, in making a differential to single-ended conversion or in rejecting a common mode signal.
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