DocumentCode
1116214
Title
DC-SQUID electronics based on adaptive positive feedback: experiments
Author
Seppa, Heikki ; Ahonen, A. ; Knuutila, J. ; Simola, J. ; Volkman, V.
Author_Institution
VTT, Tech. Res. Centre of Finland, Espoo, Finland
Volume
27
Issue
2
fYear
1991
fDate
3/1/1991 12:00:00 AM
Firstpage
2488
Lastpage
2490
Abstract
It is shown that DC-SQUID read-out electronics can be realized utilizing positive feedback without deteriorating the SQUID noise performance. The required gain rise is achieved by interconnecting the SQUID output and a flux modulation coil via a cooled FET acting as a voltage-controlled resistor; different SQUIDs with different types of FETs have been studied experimentally. Possible ways of adaptively controlling the feedback gain produced by the positive feedback are briefly discussed
Keywords
SQUIDs; electron device noise; feedback; DC-SQUID electronics; adaptive positive feedback; cooled FET; feedback gain; flux modulation coil; gain rise; noise performance; read-out electronics; voltage-controlled resistor; Coils; FETs; Feedback; Gallium arsenide; Preamplifiers; Resistors; SQUIDs; Temperature; Thermal resistance; Voltage;
fLanguage
English
Journal_Title
Magnetics, IEEE Transactions on
Publisher
ieee
ISSN
0018-9464
Type
jour
DOI
10.1109/20.133723
Filename
133723
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