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Publication - Professor Mark Beach

    A Comparison of Lumped-Based Tunable Matching Networks for Dynamically-Load-Modulated Power Amplifiers

    Citation

    Arabi, E, Gamlath, C, Morris, K & Beach, M, 2018, ‘A Comparison of Lumped-Based Tunable Matching Networks for Dynamically-Load-Modulated Power Amplifiers’. in: 2017 IEEE Asia Pacific Microwave Conference (APMC) (APMC2017): Proceedings of a meeting held 13-16 November 2017, Kuala Lumpur, Malaysia. Institute of Electrical and Electronics Engineers (IEEE), pp. 33-36

    Abstract

    The power-added-efficiency of power amplifiers deteriorates rapidly as the input power drops. The efficiency at power back-off can be improved by modulating the load dynamically with a tunable matching network. In this work, a novel design method is presented in which the dynamic range of the tunable matching network is plotted on top of the required dynamic load. A comparison between conventional topologies has been performed, and the optimal network is chosen based on its dynamic range and the tunability of its capacitors. As proof of concept, an amplifier has been fabricated and tested achieving a maximum efficiency of 60% and an improvement of 9% with 6 dB of power back-off. The proposed method is useful in designing and optimizing tunable matching networks.

    Full details in the University publications repository