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Paper Abstract and Keywords
Presentation 2007-11-15 16:15
An experimental investigation on typical low frequency amplifiers nonlinear response to microwave/quasi-millimeter wave interference
Hiroki Seo, Shunichi Futatsumori, Takashi Hikage, Toshio Nojima (Hokkaido Univ.) EMCJ2007-86
Abstract (in Japanese) (See Japanese page) 
(in English) Abstract Electromagnetic interference (EMI) due to microwave/quasi-millimeter waveband radio waves on low- frequency electronic equipments is mainly caused by nonlinear characteristics of their internal circuits. This is because the envelope of high-frequency signal is detected by the nonlinear response of circuit elements. In this report, to investigate characteristics of interference signal generated by the nonlinear response, interference signal levels depending on frequencies and field strengths of exposure signals are experimentally obtained. Firstly, six types of low frequency basic amplifiers consisting of a single transistor or an operational amplifier IC are fabricated. Secondly, to examine the detection level depending on field strength of 1 GHz exposure signal, measurements of interference signal are carried out. The exposure signal is amplitude modulated at 1 kHz. We have confirmed 1 kHz interference signal level is proportional to the square of exposed electric field strength. Then, to obtain the detection level depending on frequency of exposure signal, EMI experiments using 1 GHz - 25 GHz amplitude modulated signal are conducted. It is confirmed that interference signal levels of transistor amplifiers are rapidly decreased by slope of 17 dB/oct. In addition, when the frequency of exposure signal is above 20 GHz, interference signal level is below –90 dBm.
Keyword (in Japanese) (See Japanese page) 
(in English) electromagnetic interference (EMI) / nonlinear response / detection characteristic / / / / /  
Reference Info. IEICE Tech. Rep., vol. 107, no. 310, EMCJ2007-86, pp. 33-36, Nov. 2007.
Paper # EMCJ2007-86 
Date of Issue 2007-11-08 (EMCJ) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
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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)
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Conference Information
Committee EMCJ  
Conference Date 2007-11-15 - 2007-11-16 
Place (in Japanese) (See Japanese page) 
Place (in English) Tokyo Instutute of Technology 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To EMCJ 
Conference Code 2007-11-EMCJ 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) An experimental investigation on typical low frequency amplifiers nonlinear response to microwave/quasi-millimeter wave interference 
Sub Title (in English)  
Keyword(1) electromagnetic interference (EMI)  
Keyword(2) nonlinear response  
Keyword(3) detection characteristic  
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1st Author's Name Hiroki Seo  
1st Author's Affiliation Hokkaido University (Hokkaido Univ.)
2nd Author's Name Shunichi Futatsumori  
2nd Author's Affiliation Hokkaido University (Hokkaido Univ.)
3rd Author's Name Takashi Hikage  
3rd Author's Affiliation Hokkaido University (Hokkaido Univ.)
4th Author's Name Toshio Nojima  
4th Author's Affiliation Hokkaido University (Hokkaido Univ.)
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Speaker Author-1 
Date Time 2007-11-15 16:15:00 
Presentation Time 25 minutes 
Registration for EMCJ 
Paper # EMCJ2007-86 
Volume (vol) vol.107 
Number (no) no.310 
Page pp.33-36 
#Pages 4 
Date of Issue 2007-11-08 (EMCJ) 

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