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Byline Eamon Nash, Analog Devices. Equations (1)–(2): CMRR as the differential-to-common gain ratio and resulting common-mode output error.

www.analog.com/en/resources/technical-articles/common-mode-instrumentation-amplifiers.html

Primary publisher page explicitly credits Eamon Nash and is dated1July1998. Introduction describes differential amplification of bridge/thermocouple signals; equations1–2 give finite common-mode gain and rejection. Common Mode Voltage Range distinguishes input operating limits from rejection performance. The older PDF URL redirects to this publisher page.

Three Op-Amp Instrumentation Amplifier, Common Mode Range, Figure5: the differential signal spreads the two input-stage output potentials around the common-mode level; allowable common-mode level, differential signal and gain are interdependent. A rail-to-rail final stage does not cure clipping of an earlier stage. Publisher byline Eamon Nash,1July1998.

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 Tagged: Work by Eamon Nash