An insight into voltage-biased superconducting quantum interference devices

被引：12

作者：

Liu, Chao ^{[1
,2
,3
,5
]}

Zhang, Yi ^{[1
,2
]}

Mueck, Michael ^{[4
]}

Krause, Hans-Joachim ^{[1
,2
]}

Braginski, Alex I. ^{[1
]}

Xie, Xiaoming ^{[2
,5
]}

Offenhaeusser, Andreas ^{[1
,2
]}

Jiang, Mianheng ^{[2
,5
]}

机构：

[1] Forschungszentrum Julich, Peter Gruunberg Inst PGI 8, D-52425 Julich, Germany

[2] Collaborat CAS Shanghai, Joint Res Lab Superconduct & Bioelect, Shanghai 200050, Peoples R China

[3] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

[4] Univ Giessen, Inst Appl Phys, D-35392 Giessen, Germany

[5] Chinese Acad Sci, SIMIT, State Key Lab Funct Mat Informat, Shanghai 200050, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2012年 / 101卷 / 22期

关键词：

DC-SQUID; NOISE;

D O I：

10.1063/1.4768698

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We experimentally studied two important parameters of helium-cooled superconducting quantum interference devices (SQUIDs) in the voltage bias mode: the dynamic resistance R-d and the flux-to-current transfer coefficient partial derivative i/partial derivative Phi, with different junction shunt resistors R-J. We investigated a voltage-biased SQUID using the direct readout current-to-voltage converter scheme involving an operational amplifier. At higher R-J, the flux-to-voltage conversion coefficient partial derivative V/partial derivative Phi becomes sufficiently large to effectively suppress the room-temperature amplifier's noise without any need for additional feedback circuits. The McCumber parameter limits the rise of partial derivative V/partial derivative Phi. We discuss the performance of voltage-biased SQUIDs at different effective McCumber parameters. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4768698]

引用

页数：4

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