Noise Behavior of SQUID Bootstrap Circuit Studied by Numerical Simulation

SQUID bootstrap circuit (SBC) is a SQUID direct readout operating in the voltage bias mode. It consists of two branches connected in parallel: SQUID-inductance La branch and inductance Lb-resistance Rb branch. Its bias voltage is connected to the input terminal of preamplifier. In the SBC the voltag...

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Bibliographic Details
Published inPhysics procedia Vol. 36; pp. 127 - 132
Main Authors Wang, Huiwu, Wang, Yongliang, Dong, Hui, Zhang, Yi, Xie, Xiaoming, Krause, Hans-Joachim, Offenhäusser, Andreas
Format Journal Article
LanguageEnglish
Published Elsevier B.V 2012
Subjects
Current noise
Numerical simulation
SQUID bootstrap circuit
Numerical simulation
SQUID bootstrap circuit
Current noise
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Summary:SQUID bootstrap circuit (SBC) is a SQUID direct readout operating in the voltage bias mode. It consists of two branches connected in parallel: SQUID-inductance La branch and inductance Lb-resistance Rb branch. Its bias voltage is connected to the input terminal of preamplifier. In the SBC the voltage noise from the preamplifier creates the current noise which can be modified by the parameters. Based on the equivalent circuit for SBC and its network equations we studied its characteristics and the effect of parameters on current noise due to biased voltage noise by numerical simulation. Results suggest that SBC current noise can be effectively reduced by modifying parameters, in optimal condition the current noise can be totally suppressed. The effect of resistance Rb on the excess noise is discussed.
ISSN:1875-3892
1875-3892
DOI:10.1016/j.phpro.2012.06.058