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Bandwidth extension of GaN Doherty power amplifier: Effect on power, efficiency and linearity

Camarchia, V., Fang, Jie, Ghione, G., Khoshkholgh, A. Javan, Moreno Rubio, J. ORCID:, Pirola, M., Quaglia, R. ORCID: and Ramella, C. 2013. Bandwidth extension of GaN Doherty power amplifier: Effect on power, efficiency and linearity. Presented at: 2013 IEEE International Wireless Symposium (IWS), Beijing, China, 14-18 April 2013. 2013 IEEE International Wireless Symposium (IWS). IEEE, pp. 1-4. 10.1109/IEEE-IWS.2013.6616789

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The paper discusses the bandwidth extension of a second-harmonic tuned GaN Doherty power amplifier: the adopted strategy relies on output wideband compensation stages and input broadband matching. The single-band (3.5 GHz) and the wide-band (3-3.6 GHz) power amplifiers are compared in terms of building blocks design strategy. The performances, experimentally characterized in single- and two-tone conditions, are close to the state-of-the art for these applications, and confirm the validity of the bandwidth extension approach. In fact, output power of more than 43dBm and 6dB back-off efficiency of around 40% are maintained by the bandwidth extension strategy, as well as intermodulation ratio values. Furthermore, digital baseband predistortion is successfully applied to both stages.

Item Type: Conference or Workshop Item (Paper)
Date Type: Published Online
Status: Published
Schools: Engineering
Publisher: IEEE
ISBN: 9781467321419
Last Modified: 04 Nov 2022 12:15

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