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CMRR analysis of instrumentation amplifiers

CMRR analysis of instrumentation amplifiers

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A set of the simple and practical expressions for the CMRR of instrumentation amplifiers (IAs) based on 2, 3 and 4 opamps is given. These equations take into account not only mismatch of determined resistors but also the limited value of the CMRR of op-amps used. The derived equations are very useful for tolerance analysis which is shown on the example of the 3-op-amp IA

References

    1. 1)
      • P.H. Garret . (1978) , Analog systems for microprocessors and minicomputers.
    2. 2)
      • J.G. Graeme . (1971) , Operational amplifiers, design and applications.
    3. 3)
      • R. Best . Die Verstärkung sehr kleiner Signale. Elektroniker , EL1 - EL11
    4. 4)
      • M.A. Smither . CMRR analysis of the 3-op-amp instrumentation amplifier. Electron. Lett.
    5. 5)
      • Szynowski, J.: `Analiza tolerancji wspólczynnika CMRR wzmacniaczy pomiarowych', Proc. V Kraj. Konfer. TOiUE, Sulejów, 1982, , p. 172–176.
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