The main purpose of the output stage of an operational amplifier is to deliver a certain amount of signal power into a load with acceptably low levels of signal distortion. In a low-voltage low-power environment, this has to be achieved by efficiently using the supply voltage as well as the supply current. To implement this, the output voltage range must be as large as possible, preferably from rail to rail. To achieve this, the output transistors have to be connected in a common-source configuration. An efficient use of the supply current requires a high ratio between the maximum signal current that can be delivered to a load, and the quiescent current of the output stage. To accomplish this, the output transistors have to be class-AB biased.


Supply Voltage Operational Amplifier Output Stage Minimum Current Weak Inversion 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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  1. [1]
    P.R. Gray and R.G. Meyer, “Analog Integrated Circuits”, John Wiley & Sons, Inc., New York, USA, 1977.Google Scholar
  2. [2]
    E. Seevinck, W. de Jager, P. Buitendijk, “A Low Distortion Output Stage with Improved Stability for Monolithic Power Amplifiers”, IEEE J. Solid-State Circuits, Vol. SC-23, June 1988, pp. 794–801.CrossRefGoogle Scholar
  3. [3]
    W.C.M. Renirie and J.H. Huijsing, “Simplified Class-AB control circuits for Bipolar Rail-to-Rail Output stages of Operational Amplifiers”, Proc. European Solid-State Circuits Conference, Sept. 21–23, 1992, pp. 183–186.Google Scholar
  4. [4]
    D.M. Monticelli, “A Quad CMOS single-supply Opamp with rail-to-rail output swing”, IEEE J. of Solid State Circuits, Vol. SC-21, Dec. 1986, pp. 1026–1034.CrossRefGoogle Scholar
  5. [5]
    J.N. Babanezhad, “A low-Output-Impedance Fully Differential Op amp with Large Output Swing and Continuous-Time Common-mode Feedback”, IEEE J. of Solid State Circuits, vol. SC-26, Dec. 1991, pp. 1825–1833.CrossRefGoogle Scholar
  6. [6]
    R. Hogervorst, J.P. Tero, R.G.H. Eschauzier, J.H. Huijsing, “A Compact CMOS 3-V Rail-to-Rail Input/Output Operational Amplifiers for VLSI Cell Libraries”, In Digest IEEE International Solid-State Circuits Conference, February 16–18 1994, pp. 244–245.Google Scholar
  7. [7]
    R. Hogervorst, R.J. Wiegerink, RA.L. de Jong, J. Fonderie, R.F. Wassenaar, J.H. Huijsing, “CMOS Low-Voltage Operational Amplifiers with Constant-gm Rail-to-Rail Input Stage”, in Proceedings IEEE International Symposium on Circuit and Systems, San Diego, May 10–13, Sept. 21–23 1992, pp. 183–186.Google Scholar
  8. [8]
    R.G.H. Eschauzier, R. Hogervorst, J.H. Huijsing, “A programmable 1.5 V CMOS Class-AB Operational Amplifier with Hybrid Nested Miller Compensation for 120 dB Gain and 6 MHz UGF”, in Digest IEEE International Solid-State Circuits Conference, February 16–18, 1994, pp. 246–247.Google Scholar

Copyright information

© Springer Science+Business Media Dordrecht 1996

Authors and Affiliations

  • Ron Hogervorst
  • Johan H. Huijsing
    • 1
  1. 1.T.U. DelftThe Netherlands

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