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Modeling and digital predistortion of class-D outphasing RF power amplifiers
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences, Electronics. (Elektronik)
Linköping University. (Department of Electrical Engineering)
Vrije Universiteit Brussel. (ELEC)
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences, Electronics. (Eletronik)
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2012 (English)In: IEEE transactions on microwave theory and techniques, ISSN 0018-9480, E-ISSN 1557-9670, Vol. 60, no 6, p. 1907-1915Article in journal (Refereed) Published
Abstract [en]

This paper presents a direct model structure for describing class-D outphasing power amplifiers (PAs) and a method for digitally predistorting these amplifiers. The direct model structure is based on modeling differences in gain and delay, nonlinear interactions between the two paths, and differences in the amplifier behavior. The digital predistortion method is designed to operate only on the input signals' phases, to correct for both amplitude and phase mismatches. This eliminates the need for additional voltage supplies to compensate for gain mismatch. Model and predistortion performance are evaluated on a 32-dBm peak-output-power class-D outphasing PA in CMOS with on-chip transformers. The excitation signal is a 5-MHz downlink WCDMA signal with peak-to-average power ratio of 9.5 dB. Using the proposed digital predistorter, the 5-MHz adjacent channel leakage power ratio (ACLR) was improved by 13.5 dB, from -32.1 to -45.6 dBc. The 10-MHz ACLR was improved by 6.4 dB, from -44.3 to -50.7 dBc, making the amplifier pass the 3GPP ACLR requirements.

Place, publisher, year, edition, pages
IEEE Press, 2012. Vol. 60, no 6, p. 1907-1915
National Category
Signal Processing Telecommunications
Identifiers
URN: urn:nbn:se:hig:diva-11173DOI: 10.1109/TMTT.2012.2187532ISI: 000304859000016Scopus ID: 2-s2.0-84861808800OAI: oai:DiVA.org:hig-11173DiVA, id: diva2:471211
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Radiomätteknik för svagt ickelinjära system
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Swedish Research CouncilAvailable from: 2012-01-02 Created: 2012-01-02 Last updated: 2018-03-13Bibliographically approved

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Landin, Per NiklasIsaksson, Magnus

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