Fang, Jie, Moreno Rubio, Jorge ![]() ![]() |
Abstract
The article presents the design, realization, and experimental validation of a GaN-based hybrid Doherty power amplifier for WiMAX base-stations at 3.5 GHz. The amplifier exploits, for the first time as far as authors' knowledge goes, a second harmonic tuning scheme designed to further improve the efficiency in the Doherty region. The amplifier is based on a packaged GaN HEMT from Cree, and shows a saturated output power exceeding 43.2 dBm (21.5 W), a Doherty high-efficiency region in excess of 6 dB output back-off, with a first peak and maximum drain efficiency at saturation of 55 and 61%, respectively. The amplifier, with baseband digital predistortion, is compliant with the standard emission mask in the presence of a 9 dB peak to average power ratio WiMAX input and exhibits a weighted efficiency as high as 40%. The performances of the designed amplifier favorably compare with the state of the art for the same application.
Item Type: | Article |
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Date Type: | Publication |
Status: | Published |
Schools: | Engineering |
Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering |
Uncontrolled Keywords: | Doherty power amplifiers; high-efficiency amplifiers; GaN-based FETs; WiMax; PA linearization |
Publisher: | John Wiley & Sons |
ISSN: | 0895-2477 |
Last Modified: | 01 Nov 2022 09:29 |
URI: | https://orca.cardiff.ac.uk/id/eprint/88094 |
Citation Data
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