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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
Affiliation:
XLIM – CNRS 123, Av.Albert Thomas, 87060 Limoges Cedex, France AMPLEON, 5 Boulevard Jean-Auguste Ingres, 31770 Colomiers, France
Pierre Medrel
Affiliation:
XLIM – CNRS 123, Av.Albert Thomas, 87060 Limoges Cedex, France
Tibault Reveyrand
Affiliation:
XLIM – CNRS 123, Av.Albert Thomas, 87060 Limoges Cedex, France
Philippe Bouysse
Affiliation:
XLIM – CNRS 123, Av.Albert Thomas, 87060 Limoges Cedex, France
Jean-Michel Nébus
Affiliation:
XLIM – CNRS 123, Av.Albert Thomas, 87060 Limoges Cedex, France
Geoffroy Soubercaze-Pun
Affiliation:
CNES, 18 avenue Edouard Belin 31 401 Toulouse Cedex 9, France
Corresponding
E-mail address:

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.

Type
Power Amplifiers
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2020

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References

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