Title :
Importance of the absolute electrical length of the outphasing combiner in LINC amplification systems
Author :
Issaoun, Ammar ; Ghannouchi, Fadhel M. ; Kouki, Ammar B.
Author_Institution :
Ecole Polytechnique de Montreal, Que., Canada
Abstract :
This paper reports an experiment based study of a LINC transmitter system consisting of two saturated class B LDMOS power amplifiers and three different outphasing power combining structures. The measurement results showed that the absolute electrical length of the two arms of the outphasing combiner is a critical parameter in designing a LINC system. A peak power, efficiency of 61% was measured and an average of 10% improvement in system efficiency was obtained at back off region when using the adequate Chireix-combiner.
Keywords :
MMIC power amplifiers; MOS analogue integrated circuits; UHF power amplifiers; amplification; transmitters; Chireix-combiner; LINC amplification systems; LINC transmitter system; absolute electrical length; class B LDMOS power amplifiers; linear amplification; outphasing combiner; outphasing power combining structures; Arm; High power amplifiers; Linearity; Phase modulation; Power amplifiers; Power generation; Radio frequency; Radiofrequency amplifiers; Signal resolution; Topology;
Conference_Titel :
Microwave Conference Proceedings, 2005. APMC 2005. Asia-Pacific Conference Proceedings
Print_ISBN :
0-7803-9433-X
DOI :
10.1109/APMC.2005.1606229
