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Dynamic load modulated low-voltage GaN PA using novel low-loss GaN varactors

: Amirpour, Raul; Krause, Sebastian; Quay, Rüdiger; Ambacher, Oliver

48th European Microwave Conference, EuMC 2018. Proceedings : 25-27 September 2018, Madrid, Spain
London: Horizon House, 2018
ISBN: 978-2-87487-051-4
European Microwave Conference (EuMC) <48, 2018, Madrid>
Fraunhofer IAF ()
GaN; load modulation; 5G mobile communication; power amplifier; varactor

This paper gives a first presentation of a dynamic load modulated (DLM) power amplifier (PA) employing novel AlGaN/GaN varactors. With an AlGaN/GaN HEMT this enables the highest operating frequency ever presented for avaractor-based GaN DLM PA. Despite the low drain-source voltage of 10V, making the PA suitable for mobile applications, it shows a high drain efficiency of 61% at a maximum output power of 24dBm. At 6dB output power back-off the PA still reaches 45% efficiency. The achieved results demonstrate the promising potential of AlGaN/GaN varactors, and show the usability of AlGaN/GaN HEMT at low voltages.