Fully Differential Operational Amplifiers

  • Johan Huijsing
Part of the The Kluwer International Series in Engineering and Computer Science book series (SECS, volume 605)


As the supply and signal voltages go down to lower values from 30V, 12V, 5V, 3V, 2V, and finally IV, the signal-to-noise-and-interference ratio becomes increasingly worse. An important way to cope with this problem is to use fully differential signal paths. The differential peak-to-peak signal then becomes maximally twice the total supply voltage V S = V SP - V SN . But even more important will be that the influence of substrate interference on the two balanced signals will largely cancel y another. All kinds of amplifiers, filters, sigma-delta converters, and other circuits using fully differential OpAmps may thus be designed in a fully balanced or differential way.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. [8.1]
    Choi, T.C. et al “High-frequency CMOS switched-capacitor filters for communications applications” IEEE Journal of Solid-State Circuits, Vol. SC-18, No. 6, Dec. 1983, pp. 652–664.CrossRefGoogle Scholar
  2. [8.2]
    Hogervorst, R., and Huijsing, J.H. “Design of low-voltage low-power operational amplifier cells” Kluwer Academic Publishers, Boston USA, 1996, pp. 195–203.Google Scholar
  3. [8.3]
    Nebel, G., Kleine, U, Pfleiderer, H.J. “Large bandwidth BiCMOS operational amplifiers for SC-video-applications” Proc. ISCAS, 1994, pp. 5.85–5.88.Google Scholar
  4. [8.4]
    Huijsing, J.H., et al “Low-power low-voltage VLSI operational amplifier cells” IEEE Transactions on Circuits and Systems -I, Fundamental Theory and Applications, Vol. 42, No. 11, Nov. 1995, pp. 841–852, error in Fig. 19: Drains of M m and M 61 must interchangedly be connected.CrossRefGoogle Scholar
  5. [8.5]
    Bult, K, and Geelen, G.J.G.M. “A fast-settling CMOS op amp for SC circuits with 90-dB DC gain” IEEE Journal of Solid-State Circuits, Vol. 25, No. 6, Dec. 1990, pp. 1379–1383.CrossRefGoogle Scholar
  6. [8.6]
    Babanezhad, J.N. “A low-output-impedance fully differential op amp with large output swing and continuous-time common-mode feedback” IEEE Journal of Solid-State Circuits, Vol. 26, No. 12, Dec. 1991, pp. 1825–1833.CrossRefGoogle Scholar
  7. [8.7]
    Pernici, S., Nicolini, G., and Castello, R. “A CMOS low-distortion fully differential power amplifier with double nested Miller compensation” IEEE Journal of Solid-State Circuits, Vol. 28, No. 7, July 1993, pp. 758–763.CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media Dordrecht 2001

Authors and Affiliations

  • Johan Huijsing
    • 1
  1. 1.Delft University of TechnologyThe Netherlands

Personalised recommendations