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Paper Abstract and Keywords
Presentation 2023-03-02 13:25
Characteristic Improvement at Back-Off Region by Three-Power-Level Optimization for 3.7-GHz GaN HEMT Doherty Amplifier
Masataka Yamamoto, Kazuhiko Honjo, Yoichiro Yakayama, Ryo Ishikawa (UEC) MW2022-163
Abstract (in Japanese) (See Japanese page) 
(in English) Increasing the communication capacity and speed is required for recent wireless communication systems. Digital modulated signals with large peak-to-average power ratio (PAPR) are used to achieve these. For this, power amplifiers are required to operate high efficiency over wide dynamic range. Doherty amplifier (DA) is commonly used for the systems as an effective solution. We have proposed a design method for DA that integrates the output matching and the load modulation without a quarter-wave transformer. In this paper, we extended the previously proposed method to improve the back-off performance with a DA consisting of a carrier amplifier and two peaking amplifiers. The prototype DA achieved a drain efficiency of 56% and a power-added efficiency of 46% with a saturated output of 40.7 dBm at 3.7 GHz, and a drain efficiency of 54% and a power-added efficiency of 47% at 8.0-dB output back-off. In addition, a power-added efficiency of over 40% was obtained in the 9.8-dB output back-off region.
Keyword (in Japanese) (See Japanese page) 
(in English) Doherty amplifier / wide dynamic range / GaN HEMT / / / / /  
Reference Info. IEICE Tech. Rep., vol. 122, no. 411, MW2022-163, pp. 37-41, March 2023.
Paper # MW2022-163 
Date of Issue 2023-02-23 (MW) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF MW2022-163

Conference Information
Committee MW  
Conference Date 2023-03-02 - 2023-03-03 
Place (in Japanese) (See Japanese page) 
Place (in English) Tottori Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Microwave, etc. 
Paper Information
Registration To MW 
Conference Code 2023-03-MW 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Characteristic Improvement at Back-Off Region by Three-Power-Level Optimization for 3.7-GHz GaN HEMT Doherty Amplifier 
Sub Title (in English)  
Keyword(1) Doherty amplifier  
Keyword(2) wide dynamic range  
Keyword(3) GaN HEMT  
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1st Author's Name Masataka Yamamoto  
1st Author's Affiliation The University of Electro-Communications (UEC)
2nd Author's Name Kazuhiko Honjo  
2nd Author's Affiliation The University of Electro-Communications (UEC)
3rd Author's Name Yoichiro Yakayama  
3rd Author's Affiliation The University of Electro-Communications (UEC)
4th Author's Name Ryo Ishikawa  
4th Author's Affiliation The University of Electro-Communications (UEC)
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Speaker Author-1 
Date Time 2023-03-02 13:25:00 
Presentation Time 25 minutes 
Registration for MW 
Paper # MW2022-163 
Volume (vol) vol.122 
Number (no) no.411 
Page pp.37-41 
#Pages 5 
Date of Issue 2023-02-23 (MW) 

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