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Optimized load modulation in a doherty amplifier using a current injection technique

Hone, T., Bensmida, S., Paynter, M., Morris, K., Beach, M., McGeehan, J., Lees, Jonathan, Benedikt, Johannes and Tasker, Paul J. 2011. Optimized load modulation in a doherty amplifier using a current injection technique. Presented at: 6th European Microwave Integrated Circuits Conference (EuMIC) 2011, Manchester, UK, 10-11 October 2011. Proceedings of the 6th European Microwave Integrated Circuits Conference (EuMIC). Los Alamitos, CA: IEEE, pp. 296-299.

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Abstract

The classical Doherty configuration suffers from a lack of accurate control of the load impedance performed by the peaking stage. The result is a reduction in the maximum obtainable efficiency and linearity performance for a given input power level. By driving the carrier and peaking power amplifiers independently, it is possible to present the optimum load to the carrier stage for either maximum efficiency, linearity or anywhere in between for any input power level. This paper proposes the injection of a controllable current into the load to create the required active load-pull. Simulations in ADS using a 10W GaN HEMT device are presented for maximum efficiency. Two different Doherty power combining networks are used and the required current for each network is explained. Measurements of a class-F amplifier in a Doherty current injection architecture are taken and drain efficiency versus output power is plotted showing a potential of 10dB dynamic range of output power with a tracked drain efficiency between 65 - 70%.

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Uncontrolled Keywords: Doherty amplifier; back-off high efficiency; load modulation
Publisher: IEEE
ISBN: 9781612842363
Last Modified: 04 Jun 2017 04:19
URI: http://orca.cf.ac.uk/id/eprint/36835

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