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Paper Abstract and Keywords
Presentation 2010-12-17 16:15
A 1-V Input, 0.2-V to 0.47-V Output Switched-Capacitor DC-DC Converter with Pulse Density and Width Modulation (PDWM) for 57% Ripple Reduction
Xin Zhang, Yu Pu, Koichi Ishida (Univ. of Tokyo), Yoshikatsu Ryu, Yasuyuki Okuma (STARC), Po-Hung Chen (Univ. of Tokyo), Kazunori Watanabe (STARC), Takayasu Sakurai, Makoto Takamiya (Univ. of Tokyo) ICD2010-127
Abstract (in Japanese) (See Japanese page) 
(in English) To effectively reduce output ripple of switched-capacitor DC-DC converters which generate variable output voltages, a novel feedback control scheme is presented. The proposed scheme uses pulse density and width modulation (PDWM) to reduce the output ripple with low output voltage. The prototype chip was implemented using 65nm CMOS process. The switched-capacitor DC-DC converter has 0.2-V to 0.47-V output voltage and delivers 0.25-mA to 10-mA output current from a 1-V input supply with a peak efficiency of 87%. Compared with the conventional pulse density modulation (PDM), the proposed switched-capacitor DC-DC converter with PDWM reduces the output ripple by 57% in the low output voltage region with the efficiency penalty of 2%.
Keyword (in Japanese) (See Japanese page) 
(in English) Switched-Capacitor / DC-DC Converter / Ripple / / / / /  
Reference Info. IEICE Tech. Rep., vol. 110, no. 344, ICD2010-127, pp. 163-167, Dec. 2010.
Paper # ICD2010-127 
Date of Issue 2010-12-09 (ICD) 
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 ICD  
Conference Date 2010-12-16 - 2010-12-17 
Place (in Japanese) (See Japanese page) 
Place (in English) RCAST, Univ. of Tokyo 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Workshop for Graduate Student and Young Researchers 
Paper Information
Registration To ICD 
Conference Code 2010-12-ICD 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A 1-V Input, 0.2-V to 0.47-V Output Switched-Capacitor DC-DC Converter with Pulse Density and Width Modulation (PDWM) for 57% Ripple Reduction 
Sub Title (in English)  
Keyword(1) Switched-Capacitor  
Keyword(2) DC-DC Converter  
Keyword(3) Ripple  
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1st Author's Name Xin Zhang  
1st Author's Affiliation University of Tokyo (Univ. of Tokyo)
2nd Author's Name Yu Pu  
2nd Author's Affiliation University of Tokyo (Univ. of Tokyo)
3rd Author's Name Koichi Ishida  
3rd Author's Affiliation University of Tokyo (Univ. of Tokyo)
4th Author's Name Yoshikatsu Ryu  
4th Author's Affiliation Semiconductor Technology Academic Research Center (STARC)
5th Author's Name Yasuyuki Okuma  
5th Author's Affiliation Semiconductor Technology Academic Research Center (STARC)
6th Author's Name Po-Hung Chen  
6th Author's Affiliation University of Tokyo (Univ. of Tokyo)
7th Author's Name Kazunori Watanabe  
7th Author's Affiliation Semiconductor Technology Academic Research Center (STARC)
8th Author's Name Takayasu Sakurai  
8th Author's Affiliation University of Tokyo (Univ. of Tokyo)
9th Author's Name Makoto Takamiya  
9th Author's Affiliation University of Tokyo (Univ. of Tokyo)
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Speaker Author-1 
Date Time 2010-12-17 16:15:00 
Presentation Time 25 minutes 
Registration for ICD 
Paper # ICD2010-127 
Volume (vol) vol.110 
Number (no) no.344 
Page pp.163-167 
#Pages 5 
Date of Issue 2010-12-09 (ICD) 

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