Highly efficient three-way saturated Doherty amplifier with digital feedback predistortion
SCIE
SCOPUS
- Title
- Highly efficient three-way saturated Doherty amplifier with digital feedback predistortion
- Authors
- Moon, J; Kim, J; Kim, I; Kim, J; Kim, B
- Date Issued
- 2008-08
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGI
- Abstract
- A three-way saturated Doherty power amplifier (S-DPA) based on class-F topology is proposed to improve efficiency at large backed-off output power regions. The high efficiency is demonstrated by implementing the amplifier using Eudyna EGN010MK GaN HEMTs and testing-it with a continuous wave (CW) signal and a forward-link wide-band code division multiple access (WCDMA) 1-FA signal at 2.14 GHz. The proposed S-DPA has a power-added efficiency (PAE) of 50% for the CW signal at 10 dB backed-off output power region, while a two-way S-DPA and class-F PA have PAEs of 39% and 25%, respectively. Also, the proposed S-DPA has a PAE of 46.7% for the WCDMA 1-FA signal with peak-to-average power ratio of 10 dB, while the two-way S-DPA and the class-F PA have PAEs of 42.7% and 28.7%, respectively. Moreover, the proposed S-DPA, when linearized by a digital feedback predistorter, delivers an adjacent channel leakage ratio of -49.2 dBc at a 2.5 MHz offset with a PAE of 45.9%.
- Keywords
- class-F; Doherty power amplifier (DPA); efficiency enhancement technique; GaN power amplifier; POWER-AMPLIFIERS; RF
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/22581
- DOI
- 10.1109/LMWC.2008.2001016
- ISSN
- 1531-1309
- Article Type
- Article
- Citation
- IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS, vol. 18, no. 8, page. 539 - 541, 2008-08
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