A Load Insensitive Doherty Power Amplifier with better than −39dBc ACLR on 2:1 VSWR Circle using a Constant 50 Ω Trained Pre-distorted Signal

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Abstract

This paper presents a low-loss load-insensitive Doherty power amplifier (DPA) technique. The proposed DPA is insensitive to ohmic load variation by adjusting its supply voltages and input drive of the main and peaking stages in a mirrored approach. Moreover, a low-loss tunable matching network (TMN) is employed to cancel out any reactive part of the load. To validate this technique, a printed circuit board (PCB) based demonstrator consisting of the Doherty PA, a six-port reflectometer, and a tunable shunt resonator have been fabricated. When subjected to a 50 Ω load, at the 1 dB compression point, the DPA delivers an output power of 32.3 dBm with a power gain and peak drain efficiency of 14.6 dB and 61 %, respectively. When the DPA is driven with a pre-distorted 64-QAM 4 MHz signal optimized for the 50 Ω loading condition, it delivers 24.4 dBm at 41 % average drain efficiency, with EVM/ACLR −40.9 dB / −46.9 dBc. Subsequently, when subjected to a 2:1 VSWR over a 0°−360° mismatch trajectory, using the unaltered 50 Ω DPD correction, it is capable of delivering an output power of 24.4 ± 0.1 dBm with a 34–39 % drain efficiency while maintaining an EVM/ACLR better than −32.3 dB / −39.3 dBc for all load conditions.
Original languageEnglish
Title of host publicationProceedings of the 52nd European Microwave Conference (EuMC)
PublisherIEEE
Pages222-225
Number of pages4
ISBN (Electronic)978-2-8748-7069-9
ISBN (Print)978-1-6654-5881-8
DOIs
Publication statusPublished - 2022
Event2022 52nd European Microwave Conference (EuMC) - Milan, Italy
Duration: 27 Sep 202229 Sep 2022

Publication series

Name2022 52nd European Microwave Conference, EuMC 2022

Conference

Conference2022 52nd European Microwave Conference (EuMC)
Country/TerritoryItaly
CityMilan
Period27/09/2229/09/22

Bibliographical note

Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Keywords

  • self-healing transmitter
  • VSWR
  • control circuit
  • Doherty
  • six-port reflectometers
  • tunable matching networks

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