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Paper Abstract and Keywords
Presentation 2012-07-19 14:00
Wide Dynamic Range System of High Sensitive Digital SQUID Magnetometer with Magnetic Feedback
Yuto Tsuga, Yuki Yamanashi, Nobuyuki Yoshikawa (Yokohama National Univ.) SCE2012-15
Abstract (in Japanese) (See Japanese page) 
(in English) A digital superconducting quantum interference device (SQUID) magnetometer, which uses single flux quantum (SFQ) circuits, is superior to analog SQUID magnetometers in term of slew rate, dynamic range and ease of building multi-channel system. However, the magnetic flux resolution of the digital SQUID is limited to flux quantum $\Phi_0$ (= 2.07×$10^{-15}$ Wb) due to the intrinsic digital operation of the digital SQUID, counting the number of flux quanta output. In the case of synchronous systems, the slew rate is limited by the clock frequency. In this study, an asynchronous digital SQUID with complementary output has been devised. We have implemented the asynchronous digital SQUID magnetometer using the ISTEC-SRL 2.5 kA/cm$^{2}$ and 10 kA/cm$^{2}$ Nb process. We have confirmed the correct operation and good linearity of magnetic response up to 3000 $\Phi_0$. The slew rate is estimated to be $10^{11}\ \Phi_0$/s. We have also investigated and experimentally demonstrated improvement of the magnetic field resolution of the asynchronous digital SQUID by utilizing on-chip magnetic feedback. A dynamic range of this SQUID is limited by the amount of magnetic flux which can be stored in the feedback loop. In this report, we demonstrated and discussed the wide dynamic range system with ‘high sensitivity mode’ and ‘reset mode’. In this system, the dynamic range is not limited. We confirmed measurement result that the input waveform was reconstructed by output SFQ pulse in the wide dynamic range system.
Keyword (in Japanese) (See Japanese page) 
(in English) Superconducting quantum interference device / Single flux quantum / Magnetometer / Dynamic range / / / /  
Reference Info. IEICE Tech. Rep., vol. 112, no. 138, SCE2012-15, pp. 37-41, July 2012.
Paper # SCE2012-15 
Date of Issue 2012-07-12 (SCE) 
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 SCE  
Conference Date 2012-07-19 - 2012-07-19 
Place (in Japanese) (See Japanese page) 
Place (in English) Kikai-Shinko-Kaikan Bldg. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Signal processing technologies and their applications, etc. 
Paper Information
Registration To SCE 
Conference Code 2012-07-SCE 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Wide Dynamic Range System of High Sensitive Digital SQUID Magnetometer with Magnetic Feedback 
Sub Title (in English)  
Keyword(1) Superconducting quantum interference device  
Keyword(2) Single flux quantum  
Keyword(3) Magnetometer  
Keyword(4) Dynamic range  
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1st Author's Name Yuto Tsuga  
1st Author's Affiliation Yokohama National University (Yokohama National Univ.)
2nd Author's Name Yuki Yamanashi  
2nd Author's Affiliation Yokohama National University (Yokohama National Univ.)
3rd Author's Name Nobuyuki Yoshikawa  
3rd Author's Affiliation Yokohama National University (Yokohama National Univ.)
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Speaker Author-1 
Date Time 2012-07-19 14:00:00 
Presentation Time 25 minutes 
Registration for SCE 
Paper # SCE2012-15 
Volume (vol) vol.112 
Number (no) no.138 
Page pp.37-41 
#Pages 5 
Date of Issue 2012-07-12 (SCE) 

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