Single-Ended Branch PA Characterisation for Outphasing Amplifiers

Paolo Enrico de Falco, Konstantinos Mimis, Souheil Ben-Smida, Kevin Morris, Gavin Watkins, Atsushi Yamaoka, Keiichi Yamaguchi

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

Abstract

Back-off efficiency is a key requirement for load modulated power amplifier (PA) architectures such as Chireix outphasing. This paper studies the impact of second and third harmonic impedance tuning (Z 2fo ,Z 3fo ) on the performance of a 10 Watt GaN HEMT branch PA subject to outphasing-like load modulation, operating at 900 MHz. Performance variation of up to 3 dB output power (POUT) and 50% points drain efficiency (DE) with phase manipulation alone of Z 2fo is recorded. Optimal Z 2fo is revealed to vary - throughout a fixed and for different - outphasing trajectories. A simple technique is presented, using continuous class F -1 closed form equations, which predicts the intrinsic optimal Z 2fo for multiple points from five outphasing load trajectories, de-embedded to the current generator (CG) plane of the device.

Original languageEnglish
Title of host publication2018 13th European Microwave Integrated Circuits Conference (EuMIC)
PublisherIEEE
Pages178-181
Number of pages4
ISBN (Electronic)9782874870521
DOIs
Publication statusPublished - 19 Nov 2018
Event13th European Microwave Integrated Circuits Conference 2018 - Madrid, Spain
Duration: 24 Sep 201825 Sep 2018

Conference

Conference13th European Microwave Integrated Circuits Conference 2018
Abbreviated titleEuMIC 2018
CountrySpain
CityMadrid
Period24/09/1825/09/18

Keywords

  • harmonically tuned
  • outphasing
  • PA

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Instrumentation

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  • Cite this

    de Falco, P. E., Mimis, K., Ben-Smida, S., Morris, K., Watkins, G., Yamaoka, A., & Yamaguchi, K. (2018). Single-Ended Branch PA Characterisation for Outphasing Amplifiers. In 2018 13th European Microwave Integrated Circuits Conference (EuMIC) (pp. 178-181). IEEE. https://doi.org/10.23919/EuMIC.2018.8539963