Analysis of optimal outphasing load trajectories for GaN Pas

Paolo Enrico De Falco, Gavin Watkins, Konstantinos Mimis, Souheil Bensmida, Kevin Morris

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

5 Citations (Scopus)
194 Downloads (Pure)


This paper presents an analysis of the optimal Z f0 load trajectories of saturated GaN PAs through Z f0 and Z 2f0 load-pull measurements under constant input power on a 900 MHz 10 W PA. It is shown that a DE >50% at 10 dB back-off can be obtained for a range of 160 ? of Z 2f0 when Z f0 is set to its optimal point. The black box combiner design equations are used as a tool to determine the complete outphasing load trajectories for outphasing systems designed for different back-off levels and extract drain efficiency performance for a range of Z 2f0 terminations. When the suboptimal outphasing load trajectories are considered, Z 2f0 is demonstrated to have a greater impact compared to the case Z f0 follows the optimal load trajectories.

Original languageEnglish
Title of host publication2018 Asia-Pacific Microwave Conference, APMC 2018 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Number of pages3
ISBN (Electronic)9784902339451
ISBN (Print)9781538621844
Publication statusPublished - 17 Jan 2019
Event30th Asia-Pacific Microwave Conference, APMC 2018 - Kyoto, Japan
Duration: 6 Nov 20189 Nov 2018


Conference30th Asia-Pacific Microwave Conference, APMC 2018


  • Harmonically tuned PAs
  • Outphasing


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