Broadband Doherty Power Amplifier Based on Coupled Phase Compensation Network

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

16 Scopus Citations
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  • Wenjie Feng
  • Xiaohu Fang
  • Tushar Sharma
  • Shichang Chen

Related Research Unit(s)


Original languageEnglish
Pages (from-to)210-221
Journal / PublicationIEEE Transactions on Microwave Theory and Techniques
Issue number1
Online published5 Mar 2021
Publication statusPublished - Jan 2022


In this article, a new technique is presented to dramatically enhance the bandwidth of a postmatching Doherty power amplifier (PM-DPA). This technique is based on a coupled-line phase compensation network (PCN). Theoretical analysis shows this coupled-line PCN results in wideband impedance matching by reducing the external Q-factor in the peaking branch. Finally, when augmented with suitably selected peaking amplifier impedances, the proposed technique gave improved peak efficiency and output power over an extended bandwidth. For experimental verification, a DPA based on commercially available GaN HEMT devices (Cree CGH 40010F) was designed and fabricated. Measured results of the proposed DPA show 6-dB back-off operation between 1.3 and 2.3 GHz (55% fractional bandwidth) with efficiency in excess of 41%.

Research Area(s)

  • Bandwidth enhancement, Doherty power amplifier (DPA), GaN-based FETs, phase compensation network (PCN), wideband microwave amplifier