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Paper Abstract and Keywords
Presentation 2009-12-15 15:10
Non-binary SAR ADC with Digital Compensation of Comparator Offset Effect
Tomohiko Ogawa (Gunma Univ), Tatsuji Mtsuura (Renesas), Haruo Kobayashi, Nobukazu Takai (Gunma Univ), Masao Hotta, Hao San (Tokyo City Univ) ICD2009-101
Abstract (in Japanese) (See Japanese page) 
(in English) This paper describes techniques for creating a low-power SAR ADC with an error-correcting non-binary successive approximation algorithm:
(1) We propose a non-binary SAR ADC with two dynamic comparators; a low-power high-noise comparator for the first conversion stages, and a second comparator with lower noise but higher power consumption for the last stages. Comparator decision errors -- due to the high noise of the first conversion stages, and offset mismatch between the two comparators -- are digitally corrected by the error-correcting
non-binary successive approximation algorithm.
(2) For realizing low power consumption, a charge-sharing SAR ADC using a binary successive approximation algorithm would be attractive.
However the comparator offset in the ADC degrades the ADC linearity, and this offset is usually calibrated by an analog method. Here we propose a charge-sharing SAR ADC with an error-correcting non-binary algorithm, and with digital correction of comparator offset, so that analog calibration is not required.
(3) We also propose a non-binary charge-sharing SAR ADC with two dynamic comparators, which is the combination of (1) and (2). This makes further low power implementation possible without analog calibration.
Keyword (in Japanese) (See Japanese page) 
(in English) SAR ADC / Comparator / Low Power / Redundancy / Digitally-Assisted Analog Technology / / /  
Reference Info. IEICE Tech. Rep., vol. 109, no. 336, ICD2009-101, pp. 139-144, Dec. 2009.
Paper # ICD2009-101 
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 ICD2009-101

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) Non-binary SAR ADC with Digital Compensation of Comparator Offset Effect 
Sub Title (in English) * 
Keyword(1) SAR ADC  
Keyword(2) Comparator  
Keyword(3) Low Power  
Keyword(4) Redundancy  
Keyword(5) Digitally-Assisted Analog Technology  
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1st Author's Name Tomohiko Ogawa  
1st Author's Affiliation Gunma University (Gunma Univ)
2nd Author's Name Tatsuji Mtsuura  
2nd Author's Affiliation Renesas Technology (Renesas)
3rd Author's Name Haruo Kobayashi  
3rd Author's Affiliation Gunma University (Gunma Univ)
4th Author's Name Nobukazu Takai  
4th Author's Affiliation Gunma University (Gunma Univ)
5th Author's Name Masao Hotta  
5th Author's Affiliation Tokyo City University (Tokyo City Univ)
6th Author's Name Hao San  
6th Author's Affiliation Tokyo City University (Tokyo City Univ)
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Speaker Author-1 
Date Time 2009-12-15 15:10:00 
Presentation Time 25 minutes 
Registration for ICD 
Paper # ICD2009-101 
Volume (vol) vol.109 
Number (no) no.336 
Page pp.139-144 
#Pages 6 
Date of Issue 2009-12-07 (ICD) 

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