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A 2.14-GHz GaN MMIC Doherty Power Amplifier for Small-Cell Base Stations
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- Authors
- Cheol Ho Kim, Seunghoon Jee, Gweon-Do Jo, Kwangchun Lee, Bumman Kim
- Issue Date
- 2014-04
- Citation
- IEEE Microwave and Wireless Components Letters, v.24, no.4, pp.263-265
- ISSN
- 1531-1309
- Publisher
- IEEE
- Language
- English
- Type
- Journal Article
- Abstract
- A novel 2.14-GHz Doherty power amplifier (PA) was designed and fabricated using a 0.25-μ 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. © 2014 IEEE.
- KSP Keywords
- Adjacent channel leakage ratio(ACLR), Doherty power amplifier(DPA), GaN on SiC, Long term Evolution(LTE), Microwave monolithic integrated circuits(MMIC), Passive elements, Peak-to-Average-Power-Ratio(PAPR), Power gain, Power splitting, Small cells, base station(BS)