An instrumentation amplifier is a closed - loop gain block that has a differential input and an output that is single - ended with respect to a reference teminal . it must amplify the differential input acurately and suppress any unwanted common - mode signals 仪表放大器是一种能精确放大两输入端之间的差模信号而抑制任何共模信号,并将差分输入转换为单端输出的放大器。
百科解释
Common-mode signal is the component of an analog signal which is present with one sign on all considered conductors. In telecommunication, common-mode signal on a transmission line is known as longitudinal voltage.