Design and analysis of high-T/sub c/ SQUID current amplifiers

Author

Hildebrandt, G. ; Uhlmann, H.F.

Author_Institution

Dept. of the Fundamentals & Theory of Electr. Eng., Tech. Univ. of Ilmenau, Germany

Volume

7

Issue

2

fYear

1997

fDate

6/1/1997 12:00:00 AM

Firstpage

3481

Lastpage

3484

Abstract

SQUID preamplifiers are very sensitive and have a low noise level. We present simulation studies for asymmetric voltage biased SQUID current amplifiers with one superconducting layer. For a simple SQUID amplifier the gain has been calculated versus the loop and noise parameter. An optimum of the gain versus the loop parameter has been obtained. For a parallel SQUID array amplifier a design rule has been derived. The possible margins for the critical current have been calculated. The inductance values used in the simulations have been calculated by a 3D field program from an assumed layout.

Keywords

SQUIDs; high-temperature superconductors; preamplifiers; superconducting device noise; 3D field; asymmetric voltage bias; critical current; design; gain; high-T/sub c/ SQUID current amplifier; inductance; loop parameter; noise parameter; parallel array; preamplifier; simulation; superconducting layer; Circuit noise; Critical current; Frequency; Inductance; Josephson junctions; Power generation; Quantum capacitance; SQUIDs; Temperature; Voltage;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.622143

Filename

622143