HF outphasing transmitter using class-E power amplifiers

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 ne...

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Bibliographic Details
Published in2009 IEEE MTT-S International Microwave Symposium Digest pp. 757 - 760
Main Authors Beltran, R., Raab, F.H., Velazquez, A.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.06.2009
Subjects
asymmetric combiner
Average efficiency
Chireix
Class-E
Dynamic range
Hafnium
Impedance
Microwave frequencies
outphasing
Phase modulation
power amplifier (PA)
Power amplifiers
Power generation
Power system reliability
Power transmission lines
Radio transmitters
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ISBN1424428033
9781424428038
ISSN0149-645X
DOI10.1109/MWSYM.2009.5165807

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Summary: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.
ISBN:1424428033
9781424428038
ISSN:0149-645X
DOI:10.1109/MWSYM.2009.5165807