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Paper Abstract and Keywords
Presentation 2021-08-06 14:35
Study on adiabatic quantum-flux-parametron datapaths with feedback loops adopting delay-line clocking
Taiki Yamae (Yokohama Natl. Univ./JSPS Research Fellow), Naoki Takeuchi, Nobuyuki Yoshikawa (Yokohama Natl. Univ.) SCE2021-4
Abstract (in Japanese) (See Japanese page) 
(in English) Adiabatic quantum-flux-parametron (AQFP) is a superconductor logic family which can operate with low switching energy. So far, we designed a 4-bit microprocessor using AQFP logic and demonstrated this microprocessor at a low frequency. In order to operate AQFP microprocessors at high frequencies, it is necessary to operate AQFP datapaths with feedback loops with small clock skews. In a previous study, we studied AQFP datapaths with feedback loops adopting 4-phase clocking, in which AQFP circuits are driven by a pair of AC excitation currents with a phase separation of 90°. However, we have not yet studied AQFP datapaths with feedback loops adopting delay-line clocking, which is a low-latency clocking scheme. In the present study, we study AQFP datapaths with feedback loops adopting delay-line clocking. AQFP datapaths adopting delay-line clocking are divided into several pipeline stages. Registers are placed between stages so that data can propagate correctly. Numerical simulation shows that a looped buffer chain that is divided into four stages and is driven by delay-line clocking can operate at 5 GHz.
Keyword (in Japanese) (See Japanese page) 
(in English) superconducting integrated circuit / adiabatic quantum-flux-parametron (AQFP) / adiabatic logic circuit / / / / /  
Reference Info. IEICE Tech. Rep., vol. 121, no. 137, SCE2021-4, pp. 14-18, Aug. 2021.
Paper # SCE2021-4 
Date of Issue 2021-07-30 (SCE) 
ISSN 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)
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Conference Information
Committee SCE  
Conference Date 2021-08-06 - 2021-08-06 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To SCE 
Conference Code 2021-08-SCE 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Study on adiabatic quantum-flux-parametron datapaths with feedback loops adopting delay-line clocking 
Sub Title (in English)  
Keyword(1) superconducting integrated circuit  
Keyword(2) adiabatic quantum-flux-parametron (AQFP)  
Keyword(3) adiabatic logic circuit  
1st Author's Name Taiki Yamae  
1st Author's Affiliation Yokohama National University (Yokohama Natl. Univ./JSPS Research Fellow)
2nd Author's Name Naoki Takeuchi  
2nd Author's Affiliation Yokohama National University (Yokohama Natl. Univ.)
3rd Author's Name Nobuyuki Yoshikawa  
3rd Author's Affiliation Yokohama National University (Yokohama Natl. Univ.)
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Speaker Author-1 
Date Time 2021-08-06 14:35:00 
Presentation Time 25 minutes 
Registration for SCE 
Paper # SCE2021-4 
Volume (vol) vol.121 
Number (no) no.137 
Page pp.14-18 
Date of Issue 2021-07-30 (SCE) 

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