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Paper Abstract and Keywords
Presentation 2018-01-31 09:55
Design of Digital Filter for Digital SQUID with sub-Flux Quantum Feedback Resolution
Ryo Matsunawa, Kosuke Okabe, Masato Naruse, Tohru Taino, Hiroaki Myoren (Saitama Univ.) SCE2017-32
Abstract (in Japanese) (See Japanese page) 
(in English) Digital SQUIDs with the single flux quantum (SFQ) feedback have attracted much attention because of the feasibility of realizing a wide dynamic range and high slew rate. In order to realize higher resolution, we have studied a digital SQUID with sub-flux quantum feedback.
Combining the sub-flux quantum feedback to a feedback loop and the direct SFQ feedback to a main loop triggered by carry SFQ pulses from an up/down counter. After optimization of the circuit, we confirmed the maximum magnetic field amplitude exceed 1 $mu$T, the magnetic field noise is lower than 100 pT/$sqrt{mathrm{Hz}}$ with a signal band frequency of 1.22 MHz.
In this study, we report a design of the digital SQUID with sub-flux quantum feedback and evaluate the performance of a magnetometer using the digital SQUID.Finally we discuss the digital filter for reducing the binary data rate in order to transfer the data from low temperature circuit to the room temperature electronics.
Keyword (in Japanese) (See Japanese page) 
(in English) digital SQUID / ingle flux quantum (SFQ) circuit / sub-SFQ feedback / dynamic range / slew rate / digital filter / /  
Reference Info. IEICE Tech. Rep., vol. 117, no. 428, SCE2017-32, pp. 7-11, Jan. 2018.
Paper # SCE2017-32 
Date of Issue 2018-01-24 (SCE) 
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)
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Conference Information
Committee SCE  
Conference Date 2018-01-31 - 2018-01-31 
Place (in Japanese) (See Japanese page) 
Place (in English) Kikai-Shinko-Kaikan Bldg. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) SQUID, high frequency, sensing technologies and their applications, etc. 
Paper Information
Registration To SCE 
Conference Code 2018-01-SCE 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Design of Digital Filter for Digital SQUID with sub-Flux Quantum Feedback Resolution 
Sub Title (in English)  
Keyword(1) digital SQUID  
Keyword(2) ingle flux quantum (SFQ) circuit  
Keyword(3) sub-SFQ feedback  
Keyword(4) dynamic range  
Keyword(5) slew rate  
Keyword(6) digital filter  
Keyword(7)  
Keyword(8)  
1st Author's Name Ryo Matsunawa  
1st Author's Affiliation Saitama University (Saitama Univ.)
2nd Author's Name Kosuke Okabe  
2nd Author's Affiliation Saitama University (Saitama Univ.)
3rd Author's Name Masato Naruse  
3rd Author's Affiliation Saitama University (Saitama Univ.)
4th Author's Name Tohru Taino  
4th Author's Affiliation Saitama University (Saitama Univ.)
5th Author's Name Hiroaki Myoren  
5th Author's Affiliation Saitama University (Saitama Univ.)
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Speaker Author-1 
Date Time 2018-01-31 09:55:00 
Presentation Time 25 minutes 
Registration for SCE 
Paper # SCE2017-32 
Volume (vol) vol.117 
Number (no) no.428 
Page pp.7-11 
#Pages 5 
Date of Issue 2018-01-24 (SCE) 

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