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

Hashim, S. J., Hashmi, M. S., Williams, T., Woodington, W., Benedikt, Johannes ORCID: https://orcid.org/0000-0002-9583-2349 and Tasker, Paul ORCID: https://orcid.org/0000-0002-6760-7830 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:	18 Oct 2022 14:11
URI:	https://orca.cardiff.ac.uk/id/eprint/16705

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