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GaN digital microwave outphasing PA

Part of: EuMW Special issue 2019

Published online by Cambridge University Press:  27 April 2020

Thomas Hoffmann Open the ORCID record for Thomas Hoffmann [Opens in a new window] ,
Andreas Wentzel Open the ORCID record for Andreas Wentzel [Opens in a new window] ,
Thomas Flisgen ,
Florian Hühn Open the ORCID record for Florian Hühn [Opens in a new window]  and
Wolfgang Heinrich
Thomas Hoffmann*
Affiliation:
Ferdinand-Braun-Institut (FBH), Leibniz-Institut für Höchstfrequenztechnik, Berlin, Germany
Andreas Wentzel
Affiliation:
Ferdinand-Braun-Institut (FBH), Leibniz-Institut für Höchstfrequenztechnik, Berlin, Germany
Thomas Flisgen
Affiliation:
Ferdinand-Braun-Institut (FBH), Leibniz-Institut für Höchstfrequenztechnik, Berlin, Germany
Florian Hühn
Affiliation:
Ferdinand-Braun-Institut (FBH), Leibniz-Institut für Höchstfrequenztechnik, Berlin, Germany
Wolfgang Heinrich
Affiliation:
Ferdinand-Braun-Institut (FBH), Leibniz-Institut für Höchstfrequenztechnik, Berlin, Germany
*
Author for correspondence: T. Hoffmann, E-mail: thomas.hoffmann@fbh-berlin.de
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Abstract

This paper presents a novel GaN-based digital outphasing power amplifier (PA) for the 800 MHz range. The PA reaches a maximum output power of 5.8 W at 30 V final-stage (FS) drain supply voltage. A novel output combiner circuit is used and efficiency is improved by resonant commutation of the FSs and optimized driver circuits for the two GaN push-pull FSs. 3D electromagnetic simulation of output network has been conducted to extract an equivalent circuit model and to access full information in terms of functionality and broadband impedance characteristics for optimized outphasing operation in the final design. Measured total efficiencies (ηtot) of 59 and 25% at 0 and 10 dB power back-off are achieved, respectively, fitting the simulation quite well. The proposed digital outphasing module is a promising candidate for fully digitized base-station architectures in future wireless communications.

Keywords

Digitalpower amplifieroutphasingresonant commutationclass-Dclass-SGaN
Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , Volume 12 , Special Issue 7: EuMW 2019 Special Issue , September 2020 , pp. 567 - 577
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Copyright
Copyright © Cambridge University Press and the European Microwave Association 2020

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