Design of a 87% fractional bandwidth Doherty Power Amplifier supported by a simplified bandwidth estimation method

Moreno Rubio, Jorge Julian ORCID: https://orcid.org/0000-0003-3376-4464, Camarchia, Vittorio, Pirola, Marco and Quaglia, Roberto ORCID: https://orcid.org/0000-0003-3228-301X 2018. Design of a 87% fractional bandwidth Doherty Power Amplifier supported by a simplified bandwidth estimation method. IEEE Transactions on Microwave Theory and Techniques 66 (3) , pp. 1319-1327. 10.1109/TMTT.2017.2767586

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Abstract

This paper presents a novel technique for the design of broadband Doherty power amplifiers (DPAs), supported by a simplified approach for the initial bandwidth estimation that requires linear simulations only. The equivalent impedance of the Doherty inverter is determined by the value of the output capacitance of the power device, and the Doherty combiner is designed following this initial choice and using a microstrip network. A GaN-based single-input DPA designed adopting this method exhibits, on a state-of-the-art bandwidth of 87% (1.5-3.8 GHz), a measured output power of around 20 W with 6 dB back-off efficiency between 33% and 55%, with a gain higher than 10 dB. System-level measurements prove the linearizability of the designed Doherty amplifier when a modulated signal is applied.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Additional Information:	This is an open access article under the terms of the CC-BY Attribution 4.0 International license.
Publisher:	Institute of Electrical and Electronics Engineers (IEEE)
ISSN:	0018-9480
Date of First Compliant Deposit:	9 October 2017
Date of Acceptance:	5 October 2017
Last Modified:	05 May 2023 04:05
URI:	https://orca.cardiff.ac.uk/id/eprint/105349

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