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Paper Abstract and Keywords
Presentation 2009-12-14 13:30
[Poster Presentation] A nanowatt DA converter for subthreshold CMOS LSIs
Kazuki Yamamoto, Ken Ueno, Tetsuya Asai, Yoshihito Amemiya (Hokkaido Univ.) ICD2009-88
Abstract (in Japanese) (See Japanese page) 
(in English) An ultra-low power digital-to-analog (DA) converter based on the technique of pulse-width-modulated DA conversion was proposed. The circuit consists of a ring oscillator, a digital divider, a low-pass filter, and a current switch, which are operated in the subthreshold region of MOSFETs. The digital divider combined with the ring oscillator produces a voltage pulse whose width is proportional to the digital input. The current switch accepts the voltage pulse and sends a current pulse to the low-pass filter. The filter smooths the pulse and produces an output voltage that is proportional to the mean value of the pulse current. As a result, the circuit performs digital-to-analog conversion. The SPICE simulation with 0.35-um CMOS parameters showed that a power dissipation of our circuit was 540 nW for 8-bit DA conversion and a1.5-V power supply. Our circuit would be suitable for use in subthreshold-operated, smart sensor LSIs.
Keyword (in Japanese) (See Japanese page) 
(in English) CMOS / DA converter / Time domain / Subthreshold region / Weak inversion / Ultra-law power / /  
Reference Info. IEICE Tech. Rep., vol. 109, no. 336, ICD2009-88, pp. 59-64, Dec. 2009.
Paper # ICD2009-88 
Date of Issue 2009-12-07 (ICD) 
ISSN Print edition: ISSN 0913-5685    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 ICD2009-88

Conference Information
Committee ICD  
Conference Date 2009-12-14 - 2009-12-15 
Place (in Japanese) (See Japanese page) 
Place (in English) Shizuoka University (Hamamatsu) 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To ICD 
Conference Code 2009-12-ICD 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A nanowatt DA converter for subthreshold CMOS LSIs 
Sub Title (in English)  
Keyword(1) CMOS  
Keyword(2) DA converter  
Keyword(3) Time domain  
Keyword(4) Subthreshold region  
Keyword(5) Weak inversion  
Keyword(6) Ultra-law power  
Keyword(7)  
Keyword(8)  
1st Author's Name Kazuki Yamamoto  
1st Author's Affiliation Hokkaido University (Hokkaido Univ.)
2nd Author's Name Ken Ueno  
2nd Author's Affiliation Hokkaido University (Hokkaido Univ.)
3rd Author's Name Tetsuya Asai  
3rd Author's Affiliation Hokkaido University (Hokkaido Univ.)
4th Author's Name Yoshihito Amemiya  
4th Author's Affiliation Hokkaido University (Hokkaido Univ.)
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Speaker Author-1 
Date Time 2009-12-14 13:30:00 
Presentation Time 190 minutes 
Registration for ICD 
Paper # ICD2009-88 
Volume (vol) vol.109 
Number (no) no.336 
Page pp.59-64 
#Pages 6 
Date of Issue 2009-12-07 (ICD) 

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