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Simple 2nd-order amplifier model for differential and common-mode gain

Simple 2nd-order amplifier model for differential and common-mode gain

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© The Institution of Electrical Engineers
Published

In this contribution, a simple 2nd-order model of an operational amplifier is presented. This model, which is based on the inclusion of both the first and second most dominant poles in expressions for the gain associated with the inverting and noninverting inputs to the amplifier, permits more detailed considerations of the effects of differential and common-mode gain characteristics on op. amp. circuits than is possible by using the single-dominant-pole model.

Inspec keywords: differential amplifiers; modelling; operational amplifiers; poles and zeros

Other keywords: differential gain; poles; operational amplifier; 2nd-order model; common mode gain

Subjects: General circuit analysis and synthesis methods; Amplifiers

References

    1. 1)
      • B.A. Wooley , S.J. Wong , D.O. Pederson . A computer-aided evaluation of the 741 amplifier. IEEE Trans. , 357 - 366
    2. 2)
      • Shanta-Pai, B.H.: `Active ', Report 125, 1972.
    3. 3)
      • R. Shaumann . Low-sensitivity high-frequency tunable active filter without external capacitors. IEEE Trans. , 39 - 44
    4. 4)
      • Tanenhaus, M.E., Martin, R.L.: `Linear integrated circuit models and applications for computer aided circuit and systems analysis and design', Proceedings of 8th asilomar conference on circuits, systems and computers, 1974, , p. 339–344.
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