DC SQUID small signal analysis

Author

Carroll, Kenneth R.

Author_Institution

Dept. of Phys. & Astron., Maryland Univ., College Park, MD, USA

Volume

27

Issue

2

fYear

1991

fDate

3/1/1991 12:00:00 AM

Firstpage

3017

Lastpage

3020

Abstract

A small signal analysis for the DC SQUID (superconducting quantum interference device) is presented. This analysis involves the linearization of the SQUID equations for a given flux and current bias. Considering the SQUID to be a two-port device, an impedance matrix can be determined for a SQUID coupled to a general input circuit. The two intrinsic noise sources referred to the input are computed. One advantage of this analysis over other models of the DC SQUID is that an analytic expression can be determined for the cross-correlation power spectral density of the noise sources. These results should be useful in determining the signal-to-noise ratio of low-noise SQUIDs for a given application. Other differences and similarities of the small signal analysis to other DC SQUID models are discussed

Keywords

SQUIDs; electron device noise; matrix algebra; DC SQUID; cross-correlation power spectral density; current bias; flux; impedance matrix; intrinsic noise sources; linearization; signal-to-noise ratio; small signal analysis; two-port device; Circuit noise; Coupling circuits; Equations; Impedance; Interference; SQUIDs; Signal analysis; Signal to noise ratio; Superconducting device noise; Superconducting devices;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.133845

Filename

133845