A 22W 65% efficiency GaN Doherty Power Amplifier at 3.5 GHz for WiMAX applications

Author

Rubio, Jorge Moreno ; Fang, Jie ; Quaglia, R. ; Camarchia, V. ; Pirola, M. ; Guerrieri, S. Donati ; Ghione, G.

Author_Institution

Dipt. di Elettron., Politec. di Torino, Torino, Italy

fYear

2011

fDate

18-19 April 2011

Firstpage

1

Lastpage

4

Abstract

The design, implementation and characterization of a Doherty Power Amplifier (DPA) for 3.5 GHz WiMAX applications are discussed. The DPA has been implemented using a commercial GaN HEMT from Cree inc., following a class AB and C scheme for the main and peak module, respectively. The measured maximum power of the DPA is 22W with a first peak efficiency of 57%, and maximum drain efficiency of 65% at the DPA saturation. Efficiency over the so-called Doherty region (where both the main and the peak amplifiers operate) does not drop below 55% from saturation to 6 dB input back-off. The gain at the onset of the Doherty region is 8 dB, with around 1 dB roll-off.

Keywords

WiMax; gallium compounds; high electron mobility transistors; power amplifiers; Doherty power amplifier; WiMAX applications; class AB scheme; class C scheme; commercial HEMT; efficiency 57 percent; efficiency 65 percent; frequency 3.5 GHz; gain 8 dB; power 22 W; Current measurement; Gain; Gallium nitride; Harmonic analysis; Microwave measurements; Power generation; WiMAX; Doherty; GaN; power amplifier; wireless communications;

fLanguage

English

Publisher

ieee

Conference_Titel

Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMIC), 2011 Workshop on

Conference_Location

Vienna

Print_ISBN

978-1-4577-0650-9

Type

conf

DOI

10.1109/INMMIC.2011.5773332

Filename

5773332