共模抑制比(CMRR)是指差分放大器对同时加到两个输入端上的共模信号的抑制能力。更确切地说,CMRR是产生特定输出所需输入的共模电压与产生同样输出所需输入的差分电压的比值。同时,CMRR还等于放大器开环共模增益与开环差模增益的比值。本文下面所描述的测试方法可快速获得CMRR The common mode rejection ratio (CMRR) refers to the ability of the differential amplifier to reject common mode signals applied to both inputs simultaneously. More specifically, CMRR is the ratio of the common-mode voltage required to produce a particular output to the differential voltage required to produce the same output. At the same time, CMRR is also equal to the amplifier open-loop common-mode gain and open-loop differential mode gain ratio. The test methods described in this article provide CMRR quickly