Analog IC-Achievable Lineariser for Power Amplifiers Based on Adaptive Feedforward

  • Authors:

  • E. Bertran Albertí;A. J. Zozaya Sahad

  • Affiliations:

  • Polytechnic University of Catalonia. Dept. of Signal Theory and Communications, C/Jordi Girona 1-3, 08034—Barcelona, Spain;Polytechnic University of Catalonia. Dept. of Signal Theory and Communications, C/Jordi Girona 1-3, 08034—Barcelona, Spain

  • Venue:
  • Analog Integrated Circuits and Signal Processing
  • Year:
  • 2002

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Abstract

A compensation technique for the amplitude and phase imbalances of a feedforward lineariser using the LMS algorithm, implemented entirely in the analog domain, is presented. The lineariser is suited to RF power amplifiers, and maybe entirely developed with analog IC technologies. From simulated two-tone tests, the circuit leads to an intermodulation (IMD) reduction superior to 35 dB for a 64-QAM signal, being cheaper and competitive in performance with usual DSP-based adaptation circuits. Different implementations are evaluated, and the application of the circuit to RF power amplifiers in the DVB-T and in the LMDS frequency bands is considered.