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Effect of impedance variation around the fundamentals on PA distortions characteristics under wideband multi-tone stimulus

Hashim, Shaiful, Hashmi, Mohammad Shabi, Benedikt, Johannes and Tasker, Paul J. 2010. Effect of impedance variation around the fundamentals on PA distortions characteristics under wideband multi-tone stimulus. Presented at: IEEE Asia Pacific Conference on Circuits and Systems, Kuala Lumpur, Malaysia, 6-9 December 2010. Published in: Rohani, F. Z., Ahmad, S. A., Che Soh, A., Jaafar, H., Zaini, M. H. M., Sidek, M. H. M. and Shaufiq, M. eds. Proceedings of the 2010 Asia Pacific Conference on Circuit and System, 6th – 9th December 2010, Kuala Lumpur, Malaysia. Los Alamitos, CA: IEEE, pp. 1115-1118. 10.1109/APCCAS.2010.5775081

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Abstract

Characterisation of modern wireless power transistors and amplifies requires wideband-modulated stimuli for realistic performance evaluation. Normally power transistor performance is evaluated using passive load-pull techniques. However, these have some physical realization constraints that influence the amplitude and the phase of the presented impedance at the DUT plane as across the modulated bandwidth. The problem becomes more apparent as modulation bandwidth is increased beyond few MHz. It has been shown recently that a digitally controlled active envelop load-pull (ELP) system can completely address this problem, thus allowing for a more systematic investigation of the parameters that may affect the performance of power transistors under wideband-modulated stimuli. In this paper, non ideal multi-tone impedance conditions are purposely introduced for demonstrating their effects on power amplifier performance in order to illustrate the DUT sensitivity to measurement system imperfections at higher modulation bandwidths in excess of few MHz.

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Uncontrolled Keywords: multi-tone; non-linear; power amplifier
Publisher: IEEE
ISBN: 9781424474547
Last Modified: 04 Jun 2017 02:57
URI: http://orca.cf.ac.uk/id/eprint/14364

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