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Active envelope load-pull for wideband multi-tone stimulus incorporating delay compensation

Hashim, S. J., Hashmi, M. S., Williams, T., Woodington, W., Benedikt, Johannes and Tasker, Paul 2009. Active envelope load-pull for wideband multi-tone stimulus incorporating delay compensation. Presented at: 38th European Microwave Conference, 2008 (EuMC 2008), Amsterdam, The Netherlands, 27-31 October 2008. Proceedings of the 38th European Microwave Conference, 2008 (EuMC 2008). Los Alamitos, CA: IEEE, pp. 317-320. 10.1109/EUMC.2008.4751452

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Abstract

This paper presents, for the first time, a new active load-pull approach capable of supporting wideband multi-tone modulation based on the active envelope load-pull architecture. The new solution utilizes a digital control unit, implemented on a reconfigurable FPGA platform with high-speed signal processing capability, in the feedback loop to track the time varying amplitude and phase envelope of modulated RF communication signals. This novel approach enables a loop delay compensation scheme to be successfully implemented allowing for synchronization of the transmitted and the reflected signals over wide (>5 MHz) bandwidths. Initial, proof of concept, measurements on this active load-pull system have demonstrated that it can provide constant, frequency independent control of load impedances for signal excitations that are relevant for communication systems.

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: IEEE
ISBN: 9782874870064
Last Modified: 04 Jun 2017 03:06
URI: http://orca.cf.ac.uk/id/eprint/16705

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