Advanced GaAs power amplifier architecture linearized with a post-distortion method

S. Ben Smida, K. A. Morris, J. C. Clifton, A. Lawrenson

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

Linearizing power amplifiers (PA) using digital pre-distortion (DPD) results in the use of a pre-distorted driving input signal that exhibits higher peak-to-average power ratio (PAPR). This results in a decrease in the PA efficiency which is dependent on the level of output power back-off required. This work proposes a new linearization architecture based on a new 'post-distortion' method for power amplifier (PA) nonlinearity compensation. The proposed architecture allows for PA linearization with optimal input signal drive level to avoid efficiency degradation. A pseudomorphic high electron-mobility transistor (pHEMT) dual input PA architecture is also introduced and shown to be suitable for the proposed linearization approach. In comparison to classic pre-distortion techniques, the proposed post-distortion improves the output power by 2 dB and the drain efficiency by 9% in the presence of a 20MHz LTE up-link signal.
Original languageEnglish
Title of host publication2014 IEEE MTT-S International Microwave Symposium (IMS2014)
PublisherIEEE
ISBN (Electronic)9781479938698
DOIs
Publication statusPublished - 10 Jul 2014

Keywords

  • LTE
  • post-distortion
  • power amplifier
  • Pre-distortion
  • stacked architecture

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