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Paper Abstract and Keywords
Presentation 2026-03-05 09:30
A Comparative Analysis of Class-B and Class-J Amplifiers under Over-Saturated Input Conditions
Keisuke Koshi, Shinichi Tanaka (SIT) MW2025-196
Abstract (in Japanese) (See Japanese page) 
(in English) Continuous Class B/J power amplifiers are regarded as promising candidates for next-generation high-efficiency power amplifiers with wideband characteristics. In recent years, it has become clear that, as a common issue among all continuous-mode power amplifiers, the range of available harmonic load conditions is constrained by the effects of parasitic elements in FETs. This implies that the use of inverse Class-J operation is impractical in continuous Class B/J power amplifiers. In this paper, we report an additional challenge: even Class-B operation in continuous Class B/J power amplifiers may be difficult to incorporate into practical designs. In this study, we clarify through simulation that the characteristics of Class-B and Class-J operations exhibit pronounced differences under over-saturated input conditions. Furthermore, the validity of the simulation results is verified experimentally using a 10-W GaN HEMT.
Keyword (in Japanese) (See Japanese page) 
(in English) Continuous Class B/J amplifiers / power efficiency / harmonic tuning / Class-B / Class-J / GaN HEMT / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 394, MW2025-196, pp. 1-6, March 2026.
Paper # MW2025-196 
Date of Issue 2026-02-26 (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 MW2025-196

Conference Information
Committee MW  
Conference Date 2026-03-05 - 2026-03-06 
Place (in Japanese) (See Japanese page) 
Place (in English) Setoda city hall 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Microwave, etc. 
Paper Information
Registration To MW 
Conference Code 2026-03-MW 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Comparative Analysis of Class-B and Class-J Amplifiers under Over-Saturated Input Conditions 
Sub Title (in English)  
Keyword(1) Continuous Class B/J amplifiers  
Keyword(2) power efficiency  
Keyword(3) harmonic tuning  
Keyword(4) Class-B  
Keyword(5) Class-J  
Keyword(6) GaN HEMT  
Keyword(7)  
Keyword(8)  
1st Author's Name Keisuke Koshi  
1st Author's Affiliation Shibaura Institute of Technology (SIT)
2nd Author's Name Shinichi Tanaka  
2nd Author's Affiliation Shibaura Institute of Technology (SIT)
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Speaker Author-1 
Date Time 2026-03-05 09:30:00 
Presentation Time 25 minutes 
Registration for MW 
Paper # MW2025-196 
Volume (vol) vol.125 
Number (no) no.394 
Page pp.1-6 
#Pages 6 
Date of Issue 2026-02-26 (MW) 

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