Operation of Josephson comparator under Josephson noise from SQUID

Author

Takeda, E. ; Nishino, T. ; Takagi, K.

Author_Institution

Central Res. Lab., Hitachi Ltd., Tokyo, Japan

Volume

5

Issue

2

fYear

1995

fDate

6/1/1995 12:00:00 AM

Firstpage

2268

Lastpage

2271

Abstract

Operation of a Josephson comparator for analog-to-digital conversion of signal from a SQUID is studied. In the study, a test circuit consisting of the SQUID and the comparator is used. The measured result shows that the comparator responds to AC noise due to the AC Josephson effect. Numerical simulation shows amplitude, which is determined from the response of the comparator, is smaller than the original AC noise amplitude. The difference comes from low-pass characteristics of the Josephson junction in the comparator due to the turn-on delay. The delay is effective in reducing the AC noise, and provides a means for the accurate conversion.<>

Keywords

Josephson effect; SQUIDs; analogue-digital conversion; comparators (circuits); delays; integrated circuit noise; integrated circuit testing; superconducting device noise; superconducting device testing; superconducting integrated circuits; AC Josephson effect; AC noise; ADC; Josephson comparator; Josephson junction; Josephson noise; SQUID; analog-to-digital conversion; low-pass characteristics; turn-on delay; Analog-digital conversion; Circuit noise; Circuit testing; Delay; Josephson effect; Josephson junctions; Noise level; Noise measurement; Numerical simulation; SQUIDs;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.403037

Filename

403037