8-channel array of single-chip SQUIDs connection to Josephson multiplexer

Author

Gotoh, K. ; Fujimaki, N. ; Imamura, T. ; Hasuo, S.

Author_Institution

Fujitsu Lab. Ltd., Atsugi, Japan

Volume

3

Issue

1

fYear

1993

fDate

3/1/1993 12:00:00 AM

Firstpage

2601

Lastpage

2604

Abstract

A single-chip superconducting quantum interference device (SQUID) array interfaced to a Josephson multiplexer has been developed. A single-chip SQUID consists of a SQUID sensor and a superconducting feedback circuit. Its output is digital and can be processed with a Josephson digital circuit. The parallel output signal from the SQUID array was time-division multiplexed and summed at a single output cable by a Josephson multiplexer in a cryogenic environment. This method reduces the number of cables required for connection between the SQUID chips and room-temperature electronics. The eight-channel SQUID was tested with a 160-gate Josephson multiplexer. The authors verified the operation of the SQUID array at bias frequencies up to 5 MHz, while the multiplexer was operated at 120 MHz. The measured sensitivity was 1.13*10/sup -5/ Phi /sub 0//(Hz)/sup 1/2/ and the cut-off frequency was 350 Hz.<>

Keywords

Josephson effect; SQUIDs; electric sensing devices; feedback; multiplexing equipment; superconducting integrated circuits; time division multiplexing; 120 MHz; 350 Hz; 5 MHz; 8-channel array; Josephson multiplexer; SQUID array; SQUID sensor; cryogenic environment; digital circuit; parallel output signal; superconducting feedback circuit; superconducting quantum interference device; time-division multiplexed; Circuit testing; Cryogenics; Digital circuits; Feedback circuits; Frequency; Interference; Multiplexing; SQUIDs; Superconducting cables; Superconducting devices;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.233524

Filename

233524