Impact of PA Mismatching in Chireix-Outphasing System without Stubs

In this paper; new expressions for the Chireix combiner without stubs are derived to study the impact of the combiner mismatching to the efficiency and the linearity of the system. We show analytically that the Chireix outphasing combiner without the shunt reactance is perfectly linear but the insta...

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Bibliographic Details
Published in2007 International Symposium on Signals, Systems and Electronics pp. 201 - 204
Main Authors El-Asmar, M., Birafane, A., Kouki, A.B.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.07.2007
Subjects
Chireix combiner
Degradation
efficiency
Impedance
LINC
Linearity
Multiaccess communication
Phase modulation
Power transmission lines
Reflection
RF signals
Signal analysis
stubs
Transmission line theory
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Summary:In this paper; new expressions for the Chireix combiner without stubs are derived to study the impact of the combiner mismatching to the efficiency and the linearity of the system. We show analytically that the Chireix outphasing combiner without the shunt reactance is perfectly linear but the instantaneous efficiency degrades when impedance mismatching between the combiner and the PA occurs. We varied the length and the impedance of the λ/4 transmission line of the Chireix combiner consequently we can see by using ADS software that the system stays linear and the best efficiency exist at length of λ/4 and impedance of 1.4Z 0 . In the other hand, we note that the efficiency is reduced and is at the best equal to that of the hybrid combiner. This work is validated through simulation with ADS software using CDMA and multi-tones and one tone 2GHz envelope modulated signals.
ISBN:1424414482
9781424414482
ISSN:2161-0819
DOI:10.1109/ISSSE.2007.4294448