![]() The common-mode voltage Vcm and the differential voltage Vd are shown in the group of equations (1). ![]() Once the electronics designer connects resistors around this amplifier, in a differential configuration, the common-mode error starts to be significant. ![]() It is customary to consider the common-mode error as being negligible, based on the high Common-Mode Rejection Ratio (CMRR) of the operational amplifiers. If the common-mode voltage is not rejected, it appears as an error at the amplifier output. In many applications, the differential amplifier is used to amplify the difference between two voltages, for later processing, or to isolate a signal from common-mode noise, or to amplify a signal that rides on top of some large voltage level. What is the common-mode voltage? The common-mode voltage is the voltage level common to both inverting and non-inverting inputs of the differential amplifier. The common-mode voltage can bring errors in the differential amplifier applications.
0 Comments
Leave a Reply. |