NDLI: Low noise SQUID readout for detection of small magnetic field signal

Content Provider	IEEE Xplore Digital Library
Author	Yongliang Wang Xiaofeng Xu Guofeng Zhang Yang Qiu Shulin Zhang Xianyang Kong Huiwu Wang Yi Zhang Xiaoming Xie
Copyright Year	2013
Description	Author affiliation: Peter Grunberg Inst., Forschungszentrum Julich, Julich, Germany (Yi Zhang) \|\| State Key Lab. of Functional Mater. for Inf., Shanghai Inst. of Microsyst. & Inf. Technol., Shanghai, China (Yongliang Wang; Xiaofeng Xu; Guofeng Zhang; Yang Qiu; Shulin Zhang; Xianyang Kong; Huiwu Wang; Xiaoming Xie)
Abstract	A low noise superconducting quantum interference device (SQUID) readout scheme is developed to detect the small magnetic field signal at frequency up to MHz. It consists of a low noise small signal amplifier and a direct-coupled flux-locked loop. The flux-locked loop keeps the working point stable by cancelling the low frequency flux interference from environment. Around the working point with the maximal flux-to-voltage transfer coefficient, the SQUID is operated as high frequency small signal flux-to-voltage converter and read out by a high frequency low noise matching amplifier using a step-up transformer and a junction field-effect transistor (JFET). Experimental tests of the readout on a conventional SQUID at 4.2 K show that the equivalent flux noise is below 5 $μΦ_{0}/√Hz$ with frequency up to MHz.
Sponsorship	IEEE Appl. Supercond. Council
Starting Page	1
Ending Page	3
File Size	481142
Page Count	3
File Format	PDF
e-ISBN	9781467363716
DOI	10.1109/ISEC.2013.6604292
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-07-07
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Frequency locked loops Noise Small signal Interference Bandwidth Dc SQUID Flux-locked loop Magnetic fields Readout electronics SQUIDs
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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