A load network for Doherty amplifiers using an optimized impedance transformer

A load network for Doherty amplifiers using an optimized impedance transformer

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 d...

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Veröffentlicht in:Microwave and optical technology letters 2009-10, Vol.51 (10), p.2502-2504
Hauptverfasser: Jung, Sung-Chan, Lim, Kyoung-Hoon, Park, Hyun-Chul, Negra, Renato, Kim, Min-Su, Ghannouchi, Fadhel M., Yang, Youngoo
Format: Artikel
Sprache:eng
Schlagworte:
doherty amplifier
IM3 cancellation
impedance transformer
load network
offset line
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Zusammenfassung: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
ISSN:0895-2477
1098-2760
DOI:10.1002/mop.24657