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Paper Abstract and Keywords
Presentation 2012-03-02 16:00
Development of Low-Pass-Filter with Voltage Variable Cutoff Frequency
Goh Kobayashi, Yoshiki Kayano, Hiroshi Inoue (Akita Univ.) EMD2011-138 Link to ES Tech. Rep. Archives: EMD2011-138
Abstract (in Japanese) (See Japanese page) 
(in English) A wideband variable frequency oscillator (Voltage Controlled Oscillator) can be used in the area of signal processing. The distortion of output voltage of the VCO should be suppressed for the performance. In order to realize the single-chip VCO with wideband oscillation for diagnosing EMC,we newly attempt to establish the method for designing Low-Pass-Filter (LPF) with voltage variable cutoff frequency, which corresponds to the oscillation frequency of the VCO. The LPF consists of MOS transistor and capacitor. The resistor between drain and source in MOS transistor behaves as voltage variable resistor. Firstly,effects of the circuit configuration and the parasitic capacitor in the MOS transistor on the frequency characteristics are discussed by circuit simulation. Secondly, it is demonstrated that the use of multistage is applicable to improve the frequency characteristics of the LPF. This study reveals the basic characteristics of the single-chip system for EMC application.
Keyword (in Japanese) (See Japanese page) 
(in English) Filter / cutoff frequency / variable resistor / MOS transistor / VCO / harmonic / /  
Reference Info. IEICE Tech. Rep., vol. 111, no. 460, EMD2011-138, pp. 49-52, March 2012.
Paper # EMD2011-138 
Date of Issue 2012-02-24 (EMD) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
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 EMD2011-138 Link to ES Tech. Rep. Archives: EMD2011-138

Conference Information
Committee EMD  
Conference Date 2012-03-02 - 2012-03-02 
Place (in Japanese) (See Japanese page) 
Place (in English) Tanagawa Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To EMD 
Conference Code 2012-03-EMD 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Development of Low-Pass-Filter with Voltage Variable Cutoff Frequency 
Sub Title (in English)  
Keyword(1) Filter  
Keyword(2) cutoff frequency  
Keyword(3) variable resistor  
Keyword(4) MOS transistor  
Keyword(5) VCO  
Keyword(6) harmonic  
1st Author's Name Goh Kobayashi  
1st Author's Affiliation Akita University (Akita Univ.)
2nd Author's Name Yoshiki Kayano  
2nd Author's Affiliation Akita University (Akita Univ.)
3rd Author's Name Hiroshi Inoue  
3rd Author's Affiliation Akita University (Akita Univ.)
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Speaker Author-1 
Date Time 2012-03-02 16:00:00 
Presentation Time 15 minutes 
Registration for EMD 
Paper # EMD2011-138 
Volume (vol) vol.111 
Number (no) no.460 
Page pp.49-52 
Date of Issue 2012-02-24 (EMD) 

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