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Improving efficiency, linearity and linearisability of an asymmetric doherty power amplifier by modulating the peaking amplifier’s supply voltage

Alt, Alexander and Lees, Jonathan 2017. Improving efficiency, linearity and linearisability of an asymmetric doherty power amplifier by modulating the peaking amplifier’s supply voltage. Presented at: 20th EuMW 2017, Nuremberg, Germany, 8-13 October 2017. 2017 47th European Microwave Conference (EuMC). IEEE, pp. 464-467. 10.23919/EuMC.2017.8230890

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Abstract

Envelope tracking and asymmetric Doherty power amplifiers are two techniques that can be used to achieve high average efficiencies when amplifying signals with high peak-toaverage power ratios, e.g. those employed in modern wireless communication standards. In this paper, a combination of the two techniques, the modulation of the drain voltage of the peaking amplifier in an asymmetric Doherty power amplifier, is described. It is demonstrated how this combination can increase the efficiency in the high-power range while reducing the AM/PM distortion of the DPA. Additionally, the degrees of freedom in terms of efficiency, linearity, and linearisability when designing the shaping function is discussed. Measurements of an asymmetric 2.4 GHz DPA using 10 W and 25 W GaN HEMTs prove the concept and demonstrate the achievable improvements in terms of efficiency, linearity, and linearisability.

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Publisher: IEEE
ISBN: 978-2-87487-047-7
Related URLs:
Date of First Compliant Deposit: 31 July 2017
Last Modified: 08 Aug 2019 08:08
URI: http://orca-mwe.cf.ac.uk/id/eprint/103120

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