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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., Pirola, M., Quaglia, R. 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: 20 May 2021 01:31

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