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Paper Abstract and Keywords
Presentation 2015-11-13 13:00
Unbalance Compensation of Differential Transmission Lines with Lightning Protection Devices on PCB
Ayumi Motohashi, Fujiyuki Nakamoto, Yuichi Sasaki, Naoto Oka, Hideyuki Oh-hashi (Mitsubishi Electric Corp.) EMCJ2015-84
Abstract (in Japanese) (See Japanese page) 
(in English) Recently, differential transmission lines which have low electromagnetic radiation performance are widely used for high speed digital interconnections. Though high electrical balance is required to obtain that performance, degradation of the electrical balance may often occur from asymmetry of the line structure, such as additional patterns and electrical components connected to one or both of the single lines of differential transmission lines. In that case, some part of differential-mode signal is converted to common-mode signal, which may often increase electromagnetic radiation from the differential transmission line. It is therefore important to reduce the differential mode to common mode conversion ratio by keeping the electrical balance. We verified that the additionally connected patterns and components such as lightning protection circuits could be modeled with a shunt capacitor connected between the single line and the ground.
In this paper, we measured the differential mode to common mode conversion ratio of the differential transmission lines with lightning protection devices on printed circuit board. We propose the method of the unbalance compensation by minimizing the difference in the capacitance between each single line of the differential transmission lines.
Keyword (in Japanese) (See Japanese page) 
(in English) EMC / EMI / PCB / differential transmission line / mixed mode S-parameters / mode transformation / radiated noise suppression /  
Reference Info. IEICE Tech. Rep., vol. 115, no. 309, EMCJ2015-84, pp. 19-23, Nov. 2015.
Paper # EMCJ2015-84 
Date of Issue 2015-11-06 (EMCJ) 
ISSN Print edition: ISSN 0913-5685    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 EMCJ  
Conference Date 2015-11-13 - 2015-11-13 
Place (in Japanese) (See Japanese page) 
Place (in English) Mitsubishi Electric Corporation 
Topics (in Japanese) (See Japanese page) 
Topics (in English) EMC 
Paper Information
Registration To EMCJ 
Conference Code 2015-11-EMCJ 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Unbalance Compensation of Differential Transmission Lines with Lightning Protection Devices on PCB 
Sub Title (in English)  
Keyword(1) EMC  
Keyword(2) EMI  
Keyword(3) PCB  
Keyword(4) differential transmission line  
Keyword(5) mixed mode S-parameters  
Keyword(6) mode transformation  
Keyword(7) radiated noise suppression  
Keyword(8)  
1st Author's Name Ayumi Motohashi  
1st Author's Affiliation Mitsubishi Electric Corporation (Mitsubishi Electric Corp.)
2nd Author's Name Fujiyuki Nakamoto  
2nd Author's Affiliation Mitsubishi Electric Corporation (Mitsubishi Electric Corp.)
3rd Author's Name Yuichi Sasaki  
3rd Author's Affiliation Mitsubishi Electric Corporation (Mitsubishi Electric Corp.)
4th Author's Name Naoto Oka  
4th Author's Affiliation Mitsubishi Electric Corporation (Mitsubishi Electric Corp.)
5th Author's Name Hideyuki Oh-hashi  
5th Author's Affiliation Mitsubishi Electric Corporation (Mitsubishi Electric Corp.)
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Speaker Author-1 
Date Time 2015-11-13 13:00:00 
Presentation Time 25 minutes 
Registration for EMCJ 
Paper # EMCJ2015-84 
Volume (vol) vol.115 
Number (no) no.309 
Page pp.19-23 
#Pages
Date of Issue 2015-11-06 (EMCJ) 


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