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The effects of resistor matching on common-mode rejection

Posted: 20 Jul 2007     Print Version  Bookmark and Share

Keywords:common-mode rejection  CMR  resistor matching  differential signals 

Process control and data acquisition systems often make differential measurements so that they can isolate the desired differential signal from unwanted common-mode signals. For example, when measuring a strain gauge in a factory environment, the signal of interest is the differential voltage at the output of the strain gauge, not the 50/60Hz common-mode signal that is picked up by the wires connecting the sensor to the instrument.

Most differential signals are measured using an instrumentation amplifier or difference amplifier. This article discusses how these circuits achieve high common-mode rejection (CMR). It also explains how to quickly calculate the level of performance one can expect from off the shelf components.

View the PDF document for more information.

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