A 2.14-GHz GaN MMIC Doherty Power Amplifier for Small-Cell Base Stations
SCIE
SCOPUS
- Title
- A 2.14-GHz GaN MMIC Doherty Power Amplifier for Small-Cell Base Stations
- Authors
- CheolHo Kim; Seunghoon Jee; Gweon-Do Jo; Kwangchun Lee; Kim, B
- Date Issued
- 2014-04
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Abstract
- A novel 2.14-GHz Doherty power amplifier (PA) was designed and fabricated using a 0.25-mu m GaN on SiC monolithic microwave integrated circuit (MMIC), to build small-cell base stations. To reduce the size and loss, lumped passive elements were employed in a manner of minimizing the device count. The core components of the PA were integrated on the MMIC die to reduce the area, and low-loss chip inductors were mounted around the die to enhance the efficiency. An unconventional uneven power splitting was also used to enhance the performance. For a continuous wave, a 2-dB-gain-compression power of 40.5 dBm was obtained with a drain efficiency (DE) of 60.4%. At 7.3-dB backed-off power, a DE of 52.2% was obtained with a power gain of 15.7 dB. When a 10-MHz-bandwidth long-term evolution signal with 7.1-dB peak-to-average power ratio was applied, an adjacent channel leakage ratio (ACLR) of -34.7 dBc with a DE of 51.8% was achieved at an average power of 33.2 dBm. After a digital pre-distortion process, the ACLR and DE were improved to -49.6 dBc and 52.7%, respectively.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/14234
- DOI
- 10.1109/LMWC.2014.2299536
- ISSN
- 1531-1309
- Article Type
- Article
- Citation
- IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS, vol. 24, no. 4, page. 263 - 265, 2014-04
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