A computer model for noise in the DC SQUID

Author

Tesc, Claudia D. ; Clarke, John

Author_Institution

IEEE TMAG

Volume

Issue

fYear

1977

fDate

1/1/1977 12:00:00 AM

Firstpage

859

Lastpage

861

Abstract

A computer model for the dc SQUID is described which predicts signal and noise as a function of various SQUID parameters. Differential equations for the voltage across the SQUID including the Johnson noise in the shunted junctions are integrated stepwise in time. Noise-rounded I-V characteristics are computed as a function of applied flux, Φa, and ring inductance, L. A measure of the SQUID response, dV/dΦa, is calculated as a function of bias current. Low frequency voltage power spectral densities $S\\min{v}\\max {o}$ computed for various Φaand L show considerable variation from the corresponding single junction Values. The flux resolution $(S\\min{v}\\max {o})^{1/2}/ (dV/d\\Phi _{a})$ as a function of bias current is computed for several values of L and Φa. The results are in good agreement with experiment.

Keywords

Josephson device noise; Arm; DSL; Equations; Inductance; Josephson junctions; Low-frequency noise; Noise measurement; SQUIDs; Superconducting device noise; Voltage;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.1977.1059276

Filename

1059276

Link To Document

https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=960595