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A load network for Doherty amplifiers using an optimized impedance transformer

✍ Scribed by Sung-Chan Jung; Kyoung-Hoon Lim; Hyun-Chul Park; Renato Negra; Min-Su Kim; Fadhel M. Ghannouchi; Youngoo Yang

Publisher
John Wiley and Sons
Year
2009
Tongue
English
Weight
282 KB
Volume
51
Category
Article
ISSN
0895-2477

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✦ Synopsis

Abstract

We propose a load network, consisting of an optimized impedance transformer, for a Doherty amplifier. This load network allows the carrier and peaking amplifiers to have different load impedance. This results in better IM3 cancellation. Using a four‐carrier down‐link WCDMA signal, we achieved 0.95 dB higher output power level and 2.21% higher power‐added efficiency compared to a conventional Doherty amplifier at an ACLR level of −30 dBc. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2502–2504, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24657

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