Broadband High Efficiency Post-matching Doherty Power Amplifier Based on Mixed-Topology

Research output: Chapters, Conference Papers, Creative and Literary Works (RGC: 12, 32, 41, 45)32_Refereed conference paper (with ISBN/ISSN)

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Detail(s)

Original languageEnglish
Title of host publicationProceedings of the 2018 IEEE/MTT-S International Microwave Symposium
PublisherIEEE
Pages450-453
ISBN (Electronic)978-1-5386-5067-7
Publication statusPublished - Jun 2018

Conference

Title2018 IEEE/MTT-S International Microwave Symposium (IMS 2018)
PlaceUnited States
CityPhiladelphia
Period10 - 15 June 2018

Abstract

In this paper, a broadband and high efficiency post-matching Doherty power amplifier (PMDPA) based on a mixed-topology is proposed. The gate bias is set to give a smaller conduction angle for the carrier device and a deep Class-C mode for the peaking device to realize a high back-off efficiency. A 'π type' harmonic injection network allows the second harmonic components of two active devices to be mutually injected, thus achieving waveform amplitude modulation (WAM). This mitigates the deteriorated performance caused by the employed gate bias settings. Moreover, a coupled phase compensation network is used to compensate for the loss in bandwidth caused by this harmonic injection network. For demonstration purposes, a high efficiency Doherty prototype is devised based on two identical 10W GaN HEMTs. Measurement results show that a drain efficiency of at least 60% is achieved at 5.3-6 dB back-off power from 1.4 to 2.1 GHz.

Research Area(s)

  • Broadband, Doherty power amplifiers, harmonic injection, high Efficiency, post-matching

Citation Format(s)

Broadband High Efficiency Post-matching Doherty Power Amplifier Based on Mixed-Topology. / Zhou, Xin Yu; Chan, Wing Shing; Zheng, Shao Yong; Feng, Wen Jie; Ho, Derek.

Proceedings of the 2018 IEEE/MTT-S International Microwave Symposium . IEEE, 2018. p. 450-453 8439222.

Research output: Chapters, Conference Papers, Creative and Literary Works (RGC: 12, 32, 41, 45)32_Refereed conference paper (with ISBN/ISSN)