A Novel Adaptive Linearization Technique for a Balanced-Amplifier Array

Takana KAHO  Yo YAMAGUCHI  Tadao NAKAGAWA  Katsuhiko ARAKI  Kiyomichi ARAKI  

IEICE TRANSACTIONS on Electronics   Vol.E89-C    No.10    pp.1448-1453
Publication Date: 2006/10/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e89-c.10.1448
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Microwaves, Millimeter-Waves
adaptive linearization,  linearizer,  multi-port amplifier,  power amplifiers,  array antenna,  

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We propose a novel adaptive linearization technique for a balanced-amplifier array. The technique uses the specific intermodulation distortions (IMDs) at the output ports in the array. The detected IMD power level can be used to optimize the linearizer's characteristics. Because the design does not need as many power detectors and carrier cancel loops as it does amplifiers, we were able to successfully miniaturize the array-antenna system. This paper describes the principles, verified both experimentally and mathematically for a 4-port amplifier array.