Common-mode rejection ratio in current-mode instrumentation amplifiers

descriptionPublicationkeyboard_double_arrow_right Article 01 May 1995 English Publisher:Springer Science and Business Media LLCJournal:Analog Integrated Circuits and Signal Processing, volume 7, pages 257-260 (issn: 0925-1030, eissn: 1573-1979,

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Authors: W. J. Su; F. J. Lidgey;

doi: 10.1007/bf01250805

Common-mode rejection ratio in current-mode instrumentation amplifiers

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Abstract

The current-mode instrumentation amplifier (CMIA) based on op-amp power-supply current sensing offers distinct advantages over conventional architecture designs. The CMIA is studied in detail and the CMRR expression is derived in terms of op-amp and transistor parameters. A good CMRR is shown to depend upon several factors, including the power-supply rejection ratio of the op-amps used in the CMIA. The results obtained are shown to compare well with SPICE simulation and provide valuable design insight for development of the next generation of CMIAs.

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Oxford Brookes University
United Kingdom

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