1 volt DC programmable Josephson voltage standard

Author

Burroughs, C.J. ; Bent, S.P. ; Harvey, T.E. ; Hamilton, C.A.

Author_Institution

Nat. Inst. of Stand. & Technol., Boulder, CO, USA

Volume

9

Issue

2

fYear

1999

fDate

6/1/1999 12:00:00 AM

Firstpage

4145

Lastpage

4149

Abstract

NIST has developed a programmable Josephson voltage standard (JVS) that produces intrinsically stable voltages that are programmable from -1.1 V to +1.1 V. The rapid settling time (1 /spl mu/s), large operating current margins (2 to 4 mA), and inherent step stability of this new system make it superior to a conventional JVS for many dc measurements. This improved performance is made possible by a new integrated-circuit technology using intrinsically shunted superconductor-normal-superconductor (SNS) Josephson junctions. These junctions operate at lower excitation frequencies (10 to 20 GHz) than a conventional JVS and have 100 times greater noise immunity. The Josephson chip consists of a binary array sequence of 32 768 SNS Josephson junctions. The chip has been integrated into a completely automated system that is finding application in mechanical/electrical watt-balance experiments, evaluation of thermal voltage converters, electron-counting capacitance standards, and metrology triangle experiments.

Keywords

Josephson effect; measurement standards; programmable circuits; superconducting arrays; superconducting integrated circuits; superconductor-normal-superconductor devices; voltage measurement; 1 V; DC metrology; DC programmable Josephson voltage standard; Josephson chip; SNS Josephson junction; automated system; binary array; integrated circuit technology; Current measurement; Josephson junctions; Measurement standards; NIST; Semiconductor device measurement; Stability; Standards development; Superconducting device noise; Time measurement; Voltage;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.783938

Filename

783938