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Analysis of load mismatch effect compensation in Doherty power amplifier

Published online by Cambridge University Press:  29 June 2020

Alexis Courty ,
Pierre Medrel Open the ORCID record for Pierre Medrel [Opens in a new window] ,
Tibault Reveyrand ,
Philippe Bouysse ,
Jean-Michel Nébus  and
Geoffroy Soubercaze-Pun
Alexis Courty
Affiliation:
XLIM – CNRS 123, Av.Albert Thomas, 87060Limoges Cedex, France AMPLEON, 5 Boulevard Jean-Auguste Ingres, 31770Colomiers, France
Pierre Medrel*
Affiliation:
XLIM – CNRS 123, Av.Albert Thomas, 87060Limoges Cedex, France
Tibault Reveyrand
Affiliation:
XLIM – CNRS 123, Av.Albert Thomas, 87060Limoges Cedex, France
Philippe Bouysse
Affiliation:
XLIM – CNRS 123, Av.Albert Thomas, 87060Limoges Cedex, France
Jean-Michel Nébus
Affiliation:
XLIM – CNRS 123, Av.Albert Thomas, 87060Limoges Cedex, France
Geoffroy Soubercaze-Pun
Affiliation:
CNES, 18 avenue Edouard Belin 31 401 Toulouse Cedex 9, France
*
Author for correspondence: Pierre Medrel, E-mail: pierre.medrel@xlim.fr
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Abstract

This paper presents a theoretical and experimental analysis of the capabilities of the dual-input Doherty power amplifier (DPA) architecture to mitigate efficiency and output power degradations when used in a mismatched load environment. Following a simplified linear piecewise approach, an analytical demonstration is proposed to derive optimal radio frequency drives applied to the Auxiliary path of the DPA to restore power performances while avoiding large signal voltage clipping of active cells. The proposed analytical study is corroborated with harmonic balance simulated results of a C-band, 20-W GaN DPA prototype. The fabricated dual-input DPA prototype has been measured under 1.5-VSWR mismatch configurations to validate the proposed analysis.

Keywords

Doherty Power Amplifier (DPA)energy efficiencyHigh electron mobility transistorGallium nitride (GaN)impedance mismatch
Type
Power Amplifiers
Information
International Journal of Microwave and Wireless Technologies , Volume 13 , Issue 3 , April 2021 , pp. 211 - 222
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Copyright
Copyright © Cambridge University Press and the European Microwave Association 2020

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