Effects of anti-aliasing filters in feedback path of adaptive predistortion

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceeding


Adaptive predistortion is one of the most promising methods to linearize RF power amplifiers (PAs). Its linearity performance is, however, limited by various memory effects existing in the system. In this paper, we study the effects of anti-aliasing filters in the feedback path of adaptive predistortion. Different filter approximations are examined with a class AB power amplifier by means of simulations. Of the filters studied, Butterworth filters perform better than Chebyshev filters when they have the same noise-equivalent bandwidth (NEB). Simulation results also show that the cut-off frequency of the anti-aliasing filter affects both the convergence speed of the adaptation algorithm and the level of mean square error (MSE) between the desired and the feedback signals. To a certain degree, the higher the cut-off frequency of the filter, the less the number of iterations needed by the adaptation process


  • Weiyun Shan
  • Lars Sundström
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Electrical Engineering, Electronic Engineering, Information Engineering


  • anti-aliasing filter cut-off frequency, noise-equivalent bandwidth, Chebyshev filters, Butterworth filters, simulations, class AB power amplifier, filter approximations, feedback path, memory effects, linearity performance, RF power amplifier linearization, adaptive predistortion, anti-aliasing filters, adaptive predistortion feedback path, mean square error, adaptation algorithm convergence speed, filter cut-off frequency, iterations, adaptation process
Original languageEnglish
Title of host publication2002 IEEE MTT-S International Microwave Symposium Digest (Cat. No.02CH37278)
PublisherIEEE - Institute of Electrical and Electronics Engineers Inc.
ISBN (Print)0-7803-7239-5
Publication statusPublished - 2002
Publication categoryResearch
EventProceedings of 2002 International Microwave Symposium (MTT 2002) - Seattle, WA, United States
Duration: 2002 Jun 22002 Jun 7


ConferenceProceedings of 2002 International Microwave Symposium (MTT 2002)
CountryUnited States
CitySeattle, WA