A Doherty power amplifier based on a tapered line impedance inverter

Author

Yahyavi, Mehran ; Bertran, Eduard

Author_Institution

Dept. of Signal Theor. & Commun., Univ. Politec. de Catalunya (UPC), Castelldefels, Spain

fYear

2014

fDate

11-14 Feb. 2014

Firstpage

1

Lastpage

4

Abstract

This paper presents a wideband GaN Doherty power amplifier (DPA) in the 2.6 GHz band with a 3 stages Wilkinson splitter where the impedance inverter is based on a tapered line instead of a quarter wave transformer. From the comparison with the same amplifier using a typical quarter-wave transformer as impedance inverter, and keeping both designs the same bandwidth (1.6 to 3.3 GHz, 65% of the fractional bandwidth), the Power Added Efficiency (PAE) is enhanced up to 50% (from 40.46% to 61.17% at 35 dBm input power) in the DPA with a tapered line. Besides, the transducer gain remains practically unaltered.

Keywords

III-V semiconductors; UHF power amplifiers; gallium compounds; microwave power amplifiers; power dividers; wide band gap semiconductors; Doherty power amplifier; GaN; Wilkinson splitter; frequency 1.6 GHz to 3.3 GHz; tapered line impedance inverter; wideband power amplifier; Gallium nitride; HEMTs; Impedance matching; Performance evaluation; Power transmission lines; Doherty power amplifier (DPA); GaN; Power Added Efficiency (PAE); Tapered line;

fLanguage

English

Publisher

ieee

Conference_Titel

Multi-Conference on Systems, Signals & Devices (SSD), 2014 11th International

Conference_Location

Barcelona

Type

conf

DOI

10.1109/SSD.2014.6808763

Filename

6808763