NDLI: HF outphasing transmitter using class-E power amplifiers

Content Provider	IEEE Xplore Digital Library
Author	Beltran, R. Raab, F.H. Velazquez, A.
Copyright Year	2009
Description	Author affiliation: Green Mountain Radio Research, Colchester, VT, USA (Raab, F.H.) \|\| CICESE Research Center, Ensenada, B. C., Mexico (Beltran, R.; Velazquez, A.)
Abstract	Chireix outphasing systems have been used successfully with power amplifiers operating in class-B and F. However, when class-E PAs are used in these systems, either the efficiency or the dynamic range is poor. The asymmetric combining technique described here uses transmission lines or equivalent networks of different electrical lengths to position the impedance loci to provide good dynamic range while maintaining high efficiency. This in turn allows linear power amplification of amplitude-modulated signals with high average efficiency. The concept is verified by a 28-W PEP transmitter that operates at 1.82 MHz and achieves an efficiency of 85% or better over an amplitude range of 10 dB.
Starting Page	757
Ending Page	760
File Size	920155
Page Count	4
File Format	PDF
ISBN	9781424428038
ISSN	0149645X
DOI	10.1109/MWSYM.2009.5165807
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-07
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Hafnium Power amplifiers Impedance Power transmission lines Radio transmitters Dynamic range Phase modulation Power system reliability Microwave frequencies Power generation outphasing Average efficiency Class-E power amplifier (PA) Chireix asymmetric combiner
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering Radiation

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