Asymmetrical outphasing: Exploiting conjugate continuous modes of operation

Paolo Enrico De Falco, James Birchall, Souheil Ben Smida, Kevin Morris, Konstantinos Mimis, Gavin Watkins

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

3 Citations (Scopus)
206 Downloads (Pure)

Abstract

In conventional techniques for efficiency enhancement of outphasing systems, identical power amplifiers are employed for each branch while the output combining network is optimised using reactive compensating elements. In this work a methodology is presented for asymmetrical branch amplifier design based on the conjugate load modulation trajectories seen by each PA branch. Closed form equations and simulations are presented, demonstrating that conjugate modes of operation PAs can be used for the upper and lower amplifier branches in outphasing systems to achieve ideal maximum efficiency over the outphasing backoff range. As a proof of concept, Class B and Class J PAs were built using the Cree CGH40010 GaN HEMT. The Class J PA exhibited over 15% improvement in drain efficiency at 4dB back-off compared to the Class B PA when both were measured with the lower branch outphasing load trajectory.

Original languageEnglish
Title of host publicationProceedings of the 2017 IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications, PAWR 2017
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages18-21
Number of pages4
ISBN (Electronic)9781509034574
ISBN (Print)9781509034598
DOIs
Publication statusPublished - May 2017
Event2017 IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications, PAWR 2017 - Phoenix, United States
Duration: 15 Jan 201718 Jan 2017

Conference

Conference2017 IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications, PAWR 2017
CountryUnited States
CityPhoenix
Period15/01/1718/01/17

Keywords

  • Power amplifier
  • Outphasing
  • Continuous mode
  • Class B/J

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