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Behavioral Modeling of Outphasing Amplification Systems
Finnerty, Keith; Dooley, John; Wesson, Robin; van der Heijden, Mark P.; Acar, Mustafa; Farrell, Ronan
This paper presents a comparison of existing and novel behavioral models targeted at the outphasing power amplifier (PA) architecture. A comprehensive comparison of ten modeling strategies is presented in the results. Novel techniques for outphasing PAs, such as vector switched and dual path time series, are also presented for the first time. Investigation of such techniques was driven by the analysis of outphasing operation at minimum output powers, demonstrating the generation of frequency-dependent amplitude and phase deviations, which can be difficult to characterize. The increased robustness was achieved at the cost of additional complexity; for practical implementation, time series coefficient reduction techniques were also evaluated. The results of all modeling approaches are experimentally validated for the wideband operation of an NXP 19-W GaN digital outphasing amplifier module. Considering computational complexity and accuracy for system-level modeling across all presented options, a subset of existing and new models is identified as best suited for modeling outphasing PAs.
Keyword(s): Behavioral model; outphasing; radio frequency (RF) power amplifier (PA); Volterra
Publication Date:
Type: Journal article
Peer-Reviewed: Yes
Institution: Maynooth University
Citation(s): Finnerty, Keith and Dooley, John and Wesson, Robin and van der Heijden, Mark P. and Acar, Mustafa and Farrell, Ronan (2016) Behavioral Modeling of Outphasing Amplification Systems. IEEE Transactions on Microwave Theory and Techniques, 64 (12). pp. 4165-4173. ISSN 0018-9480
Publisher(s): IEEE
File Format(s): other
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First Indexed: 2018-12-07 06:05:54 Last Updated: 2018-12-07 06:05:54