Current-sense amplifiers magnify a small differential voltage while rejecting the input common-mode voltage.电流检测放大器放大小差分电压,同时拒绝输入共模电压。 In this role they operate like traditional op amp-based differential amplifiers.在这个职位上工作一样,他们的传统运算放大器的差分放大器。 There is, however, an important difference between these two amplifier architectures.然而,这两个之间的放大器架构的重要区别。 The input common-mode voltage for current-sense amplifiers is allowed to exceed the power-supply (V CC ) voltage.输入共模电流检测放大器电压可以超过电源,电源(V CC)的电压。 When, for example, the MAX4080 current-sense amplifier is powered from V CC = 5V, it can still withstand an input common-mode voltage of 76V.时,例如,MAX4080电流检测放大器是由V CC = 5V供电电源,它仍然可以承受的76V输入共模电压。 By using unique amplifier architectures, current-sense amplifiers are not hampered by the common-mode rejection limitations (CMRR) that arise from mismatched resistors.通过使用独特的放大器架构,电流检测放大器不是由共模抑制限制(共模抑制比),从匹配电阻产生的阻碍。 The MAX4080, for example, has 100dB (min) DC CMRR.在MAX4080,例如,为100dB(最小)直流的CMRR。 In contrast, the performance of traditional op amp-based differential amplifiers is negatively impacted by CMRR, and their effective input V OS is magnified through the signal chain.相比之下,传统运算放大器的性能是基于差分放大器的CMRR负面影响,其有效投入的 V OS是通过信号链放大。