A Bandwidth Enhanced Doherty Power Amplifier with a Compact Output Combiner

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

23 Scopus Citations
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Author(s)

  • Shichang Chen
  • Gaofeng Wang
  • Zhiqun Cheng
  • Quan Xue

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number7465688
Pages (from-to)434-436
Journal / PublicationIEEE Microwave and Wireless Components Letters
Volume26
Issue number6
Publication statusPublished - 1 Jun 2016

Abstract

This letter introduces a broadband and compact output combiner for Doherty power amplifier (DPA). A grounded quarter Wavelength λ 4) line is added to the output of the peaking amplifier, which helps to compensate for the bandwidth limiting effect that happens in the conventional combiner. Frequency response analysis indicates that stable impedance is achieved across a wide band for the carrier PA. For demonstration, a DPA prototype based on the proposed structure is implemented using two 10 W GaN HEMT transistors. At 6 dB back-off power, over 42% drain efficiency is obtained from 1.5 GHz to 2.5 GHz, accounting for 50% fractional bandwidth. In addition, a minimum of 55% drain efficiency is maintained at saturation in the same frequency band.

Research Area(s)

  • Broadband amplifiers, Doherty, drain efficiency, load modulation, output combiner

Citation Format(s)

A Bandwidth Enhanced Doherty Power Amplifier with a Compact Output Combiner. / Chen, Shichang; Wang, Gaofeng; Cheng, Zhiqun; Xue, Quan.

In: IEEE Microwave and Wireless Components Letters, Vol. 26, No. 6, 7465688, 01.06.2016, p. 434-436.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review