Design of a Linearized and Efficient Doherty Amplifier for C-Band Applications

authored by: Steffen Probst, Timo Martinelli, Steffen Seewald, Bernd Geck, Dirk Manteuffel
Abstract: In this contribution a 44.5 dBm gallium nitride (GaN) based Doherty amplifier for a center frequency of 4900 MHz is presented. The developed Doherty amplifier uses an unsymmetrical power division and offset lines for optimization of the load modulation over the dynamic output range. Various drain supply voltages of the carrier and the peak amplifier are used to optimize the gain. Furthermore, the error vector magnitude (EVM) and the adjacent channel leakage ratio (ACLR) are reduced by using a memoryless digital predistortion (DPD) based on lookup table (LUT) model. All this design strategies improve the linearity of the Doherty amplifier.
Organisation(s): Institute of Microwave and Wireless Systems
Type: Conference contribution
Pages: 121-124
No. of pages: 4
Publication date: 21.12.2017
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Electronic, Optical and Magnetic Materials, Computer Networks and Communications, Electrical and Electronic Engineering
Electronic version(s): https://doi.org/10.23919/EuMIC.2017.8230675 (Access: Closed)
: Details in the research portal "Research@Leibniz University"

BibTeX

@inproceedings{61a7c60d27b443a285a98c74ca8a3650,
title = "Design of a Linearized and Efficient Doherty Amplifier for C-Band Applications",
abstract = "In this contribution a 44.5 dBm gallium nitride (GaN) based Doherty amplifier for a center frequency of 4900 MHz is presented. The developed Doherty amplifier uses an unsymmetrical power division and offset lines for optimization of the load modulation over the dynamic output range. Various drain supply voltages of the carrier and the peak amplifier are used to optimize the gain. Furthermore, the error vector magnitude (EVM) and the adjacent channel leakage ratio (ACLR) are reduced by using a memoryless digital predistortion (DPD) based on lookup table (LUT) model. All this design strategies improve the linearity of the Doherty amplifier.",
author = "Steffen Probst and Timo Martinelli and Steffen Seewald and Bernd Geck and Dirk Manteuffel",
note = "Publisher Copyright: {\textcopyright} 2017 European Microwave Association. Copyright: Copyright 2018 Elsevier B.V., All rights reserved.; 12th European Microwave Integrated Circuits Conference, EuMIC 2017 ; Conference date: 09-10-2017 Through 12-10-2017",
year = "2017",
month = dec,
day = "21",
doi = "10.23919/EuMIC.2017.8230675",
language = "English",
isbn = "978-1-5386-3966-5",
pages = "121--124",
booktitle = "Proceedings of the 12th European Microwave Integrated Circuits Conference",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
address = "United States",
}