Application of small-signal model to DC SQUID circuit design

Author

Geren, W.P.

Author_Institution

Boeing Defense & Space Group, Seattle, WA, USA

Volume

5

Issue

2

fYear

1995

fDate

6/1/1995 12:00:00 AM

Firstpage

2770

Lastpage

2773

Abstract

As the performance of HTS DC SQUIDs continues to improve, their utilization in RF devices (e.g., amplifiers, nuclear magnetic resonance detectors) having complex circuitry becomes more attractive. To fully realize their potential in this application, accurate and efficient analysis techniques are required to assist the circuit designer. Beginning with measured V-phi and I-V data for the device, we have used the small-signal model to optimize the design of a two-stage low-noise amplifier (LNA) comprised of DC SQUIDs. Optimization criteria were maximum gain and minimum noise figure at the upper band edge. We have shown that the small signal model is an invaluable design tool which provides the analytical performance data needed to optimize the SQUID and its attendant RF circuitry.<>

Keywords

SQUIDs; high-temperature superconductors; microwave amplifiers; microwave detectors; superconducting device noise; superconducting microwave devices; DC SQUID circuit design; HTS; I-V data; RF circuitry; RF devices; V-phi data; amplifiers; analytical performance data; complex circuitry; design; maximum gain; minimum noise figure; nuclear magnetic resonance detectors; small-signal model; two-stage low-noise amplifier; upper band edge; Circuit synthesis; Design optimization; Detectors; High temperature superconductors; Magnetic circuits; Nuclear magnetic resonance; RLC circuits; Radio frequency; Radiofrequency amplifiers; SQUIDs;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.403165

Filename

403165