DC-squid electronics based on adaptive positive feedback: Experiments

Heikki Seppä; Antti Ahonen; Jukka Knuuttila; Juha Simola; Visa Vilkman

doi:10.1109/20.133723

DC-squid electronics based on adaptive positive feedback: Experiments

Heikki Seppä, Antti Ahonen, Jukka Knuuttila, Juha Simola, Visa Vilkman

Helsinki University of Technology

Research output: Contribution to journal › Article › Scientific › peer-review

41 Citations (Scopus)

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.

Original language	English
Pages (from-to)	2488 - 2490
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	27
Issue number	2
DOIs	https://doi.org/10.1109/20.133723
Publication status	Published - 1991
MoE publication type	A1 Journal article-refereed

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10.1109/20.133723

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title = "DC-squid electronics based on adaptive positive feedback: Experiments",

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.",

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year = "1991",

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AU - Seppä, Heikki

AU - Ahonen, Antti

AU - Knuuttila, Jukka

AU - Simola, Juha

AU - Vilkman, Visa

PY - 1991

Y1 - 1991

N2 - 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.

AB - 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.

U2 - 10.1109/20.133723

DO - 10.1109/20.133723

M3 - Article

SN - 0018-9464

VL - 27

SP - 2488

EP - 2490

JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

IS - 2

ER -

DC-squid electronics based on adaptive positive feedback: Experiments

Abstract

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