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Modeling and digital predistortion of class-D outphasing RF power amplifiers
KTH, School of Electrical Engineering (EES), Signal Processing. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.
University of Linköping. (Department of Electrical Engineering)
Vrije Universiteit Brussel. (IR/ELEC)
University of Gävle. (Department of Electronics, Mathematics and Natural Sciences)
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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, 1907-1915 p.Article 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 (PAPR) 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 dBc to -45.6 dBc. The 10 MHz ACLR was improved by 6.4 dB, from -44.3 dBc to -50.7 dBc, making the amplifier pass the 3GPP ACLR requirements.

Place, publisher, year, edition, pages
2012. Vol. 60, no 6, 1907-1915 p.
Keyword [en]
Power amplifiers, behavioral modeling, digital predistortion, outphasing amplifier, LINC
National Category
Signal Processing Telecommunications
Identifiers
URN: urn:nbn:se:kth:diva-77510DOI: 10.1109/TMTT.2012.2187532ISI: 000304859000016OAI: oai:DiVA.org:kth-77510DiVA: diva2:491753
Funder
Swedish Research Council
Note
Updated from accepted to published. QC 20120702Available from: 2012-02-07 Created: 2012-02-07 Last updated: 2017-12-08Bibliographically approved

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