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Paper Abstract and Keywords
Presentation 2022-01-21 14:00
Study of Reflection Effects and Stabilization of High-Speed Operation for Long Interconnection of Adiabatic Quantum-Flux-Parametron Logic Circuits
Naoya Mizushima, Naoki Takeuchi, Yuki Yamanashi, Nobuyuki Yoshikawa (Yokohama National Univ.) SCE2021-13
Abstract (in Japanese) (See Japanese page) 
(in English) The adiabatic quantum-flux-parametron (AQFP) circuit is a superconducting logic circuit with extremely low power consumption. Many AQFP large-scale circuits have been designed and demonstrated so far. However, there is a problem that operation of AQFP become unstable in long-distance signal transmission during high-speed operation, which severely limits the wiring length and increases the circuit area and latency. To solve this problem, we conducted simulations using a transmission line model. We confirmed that the cause of the unstable operation is the multiple reflection of signal current between the gates. We showed that we can get correct operation inserting normal conductive resistance Rpar between input port of wire and ground. We evaluated the margin of JJ and energy consumption of the citcuit with Rpar and the optimal value of Rpar was determined. We also fabricated the circuit with Rpar inserted and measured the BER to demonstrate the operation and evaluate the effectiveness.
Keyword (in Japanese) (See Japanese page) 
(in English) AQFP / wire length / reflection / BER / / / /  
Reference Info. IEICE Tech. Rep., vol. 121, no. 340, SCE2021-13, pp. 6-11, Jan. 2022.
Paper # SCE2021-13 
Date of Issue 2022-01-14 (SCE) 
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)
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Conference Information
Committee SCE  
Conference Date 2022-01-21 - 2022-01-21 
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 2022-01-SCE 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Study of Reflection Effects and Stabilization of High-Speed Operation for Long Interconnection of Adiabatic Quantum-Flux-Parametron Logic Circuits 
Sub Title (in English)  
Keyword(1) AQFP  
Keyword(2) wire length  
Keyword(3) reflection  
Keyword(4) BER  
1st Author's Name Naoya Mizushima  
1st Author's Affiliation Yokohama National University (Yokohama National Univ.)
2nd Author's Name Naoki Takeuchi  
2nd Author's Affiliation Yokohama National University (Yokohama National Univ.)
3rd Author's Name Yuki Yamanashi  
3rd Author's Affiliation Yokohama National University (Yokohama National Univ.)
4th Author's Name Nobuyuki Yoshikawa  
4th Author's Affiliation Yokohama National University (Yokohama National Univ.)
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Date Time 2022-01-21 14:00:00 
Presentation Time 25 minutes 
Registration for SCE 
Paper # SCE2021-13 
Volume (vol) vol.121 
Number (no) no.340 
Page pp.6-11 
Date of Issue 2022-01-14 (SCE) 

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