Large-signal performance of feedback automatic gain control systems

JP McGeehan, DF Burrows

Research output: Contribution to journalArticle (Academic Journal)peer-review


Feedback automatic gain control (FBAGC) is used to maintain the mean level of one or more signals throughout a signal processing system at a fixed value. The paper is particularly concerned with the application of FBAGC to receiver design and discusses the problem of attempting to suppress large unwanted envelope variations of an incoming signal without distorting any wanted modulation. A simple feedforward model of FBAGC systems predicts their effect on deep sinusoidal variations of the input signal's envelope. Experimental results confirming the predictions are presented, and a method of determining the parameters of an undefined AGC system given. Finally, the fundamental problems of FBAGC dynamics are discussed, and a technique is suggested for greatly improving them
Original languageEnglish
Pages (from-to)110 - 117
JournalIEE Proceedings F - Communications, Radar and Signal Processing
Issue number2
Publication statusPublished - Apr 1981

Bibliographical note

Sponsorship: The authors are grateful for the provision of facilities at the University of Bath and for the encouragement given by Prof. W. Gosling. They are particularly grateful to G. Lightfoot and A. Lymer of the Wolfson Laboratory, School of Electrical Engineering, for their comments on several aspects of this work. Finally, one of the authors (DFB) is grateful to the UK Science Research Council for the award of a research studentship

Publisher: Institution of Electrical Engineers (IEE)


  • feedback
  • control systems
  • closed-loop systems
  • nonlinear systems
  • signal processing
  • mobile radio

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