An intermodulation products generator for predistortion of base station HPAs

  • Authors:

  • M. X. Xiao;S. W. Cheung;T. I. Yuk

  • Affiliations:

  • The Department of Electrical and Electronic Engineering, The University of Hong Kong;The Department of Electrical and Electronic Engineering, The University of Hong Kong;The Department of Electrical and Electronic Engineering, The University of Hong Kong

  • Venue:
  • RWS'09 Proceedings of the 4th international conference on Radio and wireless symposium
  • Year:
  • 2009

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Abstract

This paper presents the design of an intermodulation (IM) products generator for predistortion of high-power amplifiers (HPAs) used in the base stations of cellular mobile systems. The IM products generator composes of two simple mixers constructed with Schottky diodes, has a simple structure and requires no external dc bias voltage. Simulation and measurement results show that the generator has a low conversion loss and low spurious frequency components. Studies of the IM3 generator for predistortion of a practical base station HP A are also carried out by simulation and measurements. Measurement result of a two-tone test shows that the predistorter can suppress the 3rd intermodulation distortion (IMD) products by 15 dB.