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Paper Abstract and Keywords
Presentation 2021-03-02 10:50
A Study on the bandwidth of the matching circuit using transformer
Satoshi Tanaka (Murata Manufacturing) CAS2020-79 CS2020-86
Abstract (in Japanese) (See Japanese page) 
(in English) With the spread of the fifth generation mobile phone, the increase of the output power of power amplifier (PA) has become important, and in recent years, differential amplifiers that can increase the output voltage amplitude for the power supply voltage have been examined from the viewpoint of power synthesis.
In the case of a differential PA, in addition to the advantage of voltage amplitude, the load impedance can be set 4 times as much as that of a single-ended PA, which makes it possible to reduce the impact of parasitic resistance.
With the study of the differential PA, many transformer matching circuits have been studied in addition to the LC matching circuits that have been widely used in the past.
The transformer matching circuit can easily realize the differential-single conversion, and the transformer matching circuit is an indispensable technology in the differential PA.
As with the LC matching circuit, widening the bandwidth of the transformer matching circuit is an issue.
In this report, we analyze the characteristics of basic transformer matching circuits by adding input/output shunt capacitance to transformers and clarify the conditions of bandwidth improvement.
Keyword (in Japanese) (See Japanese page) 
(in English) Mobile phone / Power amplifier / Matching circuit / RF / Transformer / LC / /  
Reference Info. IEICE Tech. Rep., vol. 120, no. 385, CAS2020-79, pp. 41-46, March 2021.
Paper # CAS2020-79 
Date of Issue 2021-02-22 (CAS, CS) 
ISSN Online edition: ISSN 2432-6380
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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)
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Conference Information
Committee CAS CS  
Conference Date 2021-03-01 - 2021-03-02 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Network processor, Signal processing and circuits for communications, Wireless LAN / PAN, etc. 
Paper Information
Registration To CAS 
Conference Code 2021-03-CAS-CS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Study on the bandwidth of the matching circuit using transformer 
Sub Title (in English)  
Keyword(1) Mobile phone  
Keyword(2) Power amplifier  
Keyword(3) Matching circuit  
Keyword(4) RF  
Keyword(5) Transformer  
Keyword(6) LC  
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1st Author's Name Satoshi Tanaka  
1st Author's Affiliation Murata Manufacturing Co., Ltd. (Murata Manufacturing)
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Speaker Author-1 
Date Time 2021-03-02 10:50:00 
Presentation Time 25 minutes 
Registration for CAS 
Paper # CAS2020-79, CS2020-86 
Volume (vol) vol.120 
Number (no) no.385(CAS), no.386(CS) 
Page pp.41-46 
#Pages
Date of Issue 2021-02-22 (CAS, CS) 


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