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3.5 GHz WiMAX GaN doherty power amplifier with second harmonic tuning

Fang, Jie, Moreno Rubio, Jorge, Quaglia, Roberto, Camarchia, Vittorio, Pirola, Marco, Guerrieri, Simona Donati, Ramella, Chiara and Ghione, Giovanni 2012. 3.5 GHz WiMAX GaN doherty power amplifier with second harmonic tuning. Microwave and Optical Technology Letters 54 (11) , pp. 2601-2605. 10.1002/mop.27132

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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
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: 20 May 2021 01:31

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