Title :
New Output Combiner for Doherty Amplifiers
Author :
Giofre, R. ; Colantonio, P. ; Giannini, F. ; Piazzon, L.
Author_Institution :
Electron. Eng. Dept., Univ. of Roma Tor Vergata, Rome, Italy
Abstract :
In this letter, a new output combining network for the implementation of a Doherty Power Amplifier (DPA) is presented. The proposed topology simultaneously allows the active load modulation and the output matching, by adopting more realizable elements than the standard DPA, especially when high output power levels are required. The innovative design approach is demonstrated through a practical prototype realization based on GaN-HEMT devices. Experimental results have shown a 65%-48% efficiency at about 42-36 dBm output power with a gain compression lower than 1.5 dB from 1.95 to 2.25 GHz.
Keywords :
III-V semiconductors; UHF power amplifiers; gallium compounds; high electron mobility transistors; network topology; wide band gap semiconductors; Doherty power amplifier; GaN; HEMT device-based practical prototype realization; active load modulation; frequency 1.95 GHz to 2.25 GHz; gain compression; high output power levels; output combining network; output matching; standard DPA; Gain; Impedance; Modulation; Power generation; Standards; Topology; Wireless communication; Doherty power amplifier (DPA); GaN; WiMAX;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2012.2236308
