Class AB Micropower Operational Amplifiers

  • Fernando Silveira
  • Denis Flandre
Part of the The Springer International Series in Engineering and Computer Science book series (SECS, volume 758)

Abstract

Class AB amplifiers contribute to minimize power in several ways: on the one hand by decoupling the large signal (i.e. slew rate and current through the load resistor), and small signal (i.e. stability) requirements on the output stage; on the other hand by reducing quiescent current consumption when the signal to be processed, as in this case the cardiac signal, is “active” during only a small part of the system cycle. When a class A amplifier is applied, as was the case of the pacemaker sense channel described in Chapter 2, the class A bias current, which is consumed permanently, must be dimensioned according to the output current demand when a large signal is applied. However, this large signal is only present during a very small part of the system cycle.

Keywords

Parasitic Capacitance Output Stage Phase Margin Loop Gain Current Mirror 
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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Copyright information

© Springer Science+Business Media New York 2004

Authors and Affiliations

  • Fernando Silveira
    • 1
  • Denis Flandre
    • 2
  1. 1.Universidad de la República and CCC S.A.MontevideoUruguay
  2. 2.Université catholique de LouvainLouvain-la-NeuveBelgium

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