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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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References

  1. C. Toumazou and F. J. Lidgey, “Novel current-mode instrumentation amplifier,”Electronics Letters, vol. 25, no. 3, pp. 228–230, 1989.

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  2. Q. S. Zhu, F. J. Lidgey, and W. J. Su, “High CMRR, second generation current-mode instrumentation amplifiers,” inProc. 1993 IEEE Int. Symp. on Circuits and Systems, Chicago, May 1993, pp. 1326–1328.

  3. M. A. Smither, D. R. Pugh, and L. M. Woolard, “CMRR analysis of the 3-op-amp instrumentation amplifier,”Electronics Letters, vol. 13, no. 20, p. 594, 1977.

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  4. R. Pallas-Areny and J. G. Webster, “Common-mode rejection ratio in differential amplifiers,”IEEE Trans. on Inst. and Measu., vol. 40, no. 4, pp. 669–676, 1991.

    Google Scholar 

  5. W. J. Su, F. J. Lidgey, S. Porta, and Q. S. Zhu, “Analysis of IC op-amp power-supply current sensing,” inProc. IEEE Int. Symp. Circuits and Systems, May-June 1994, pp 5.541–5.544.

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Authors and Affiliations

  1. School of Engineering, Oxford Brookes University, OX3 OBP, Oxford, UK

    W. J. Su & F. J. Lidgey

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  1. W. J. Su
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  2. F. J. Lidgey
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Su, W.J., Lidgey, F.J. Common-mode rejection ratio in current-mode instrumentation amplifiers. Analog Integr Circ Sig Process 7, 257–260 (1995). https://doi.org/10.1007/BF01250805

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  • DOI: https://doi.org/10.1007/BF01250805

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