Broadband Doherty Power Amplifier Based on Coupled Phase Compensation Network

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

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Author(s)

  • Wenjie Feng
  • Xiaohu Fang
  • Tushar Sharma
  • Shichang Chen

Related Research Unit(s)

Detail(s)

Original languageEnglish
Journal / PublicationIEEE Transactions on Microwave Theory and Techniques
Online published5 Mar 2021
Publication statusOnline published - 5 Mar 2021

Abstract

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