New SQUID gate and its implementation into logic circuits

Author

Furuta, F. ; Matsumoto, S. ; Akaike, H. ; Fujimaki, A. ; Hayakawa, H.

Author_Institution

Dept. of Quantum Eng., Nagoya Univ., Japan

Volume

7

Issue

2

fYear

1997

fDate

6/1/1997 12:00:00 AM

Firstpage

3311

Lastpage

3314

Abstract

We propose non-latching gates based on Superconducting QUantum Interference Device (SQUID) and logic circuits based on it. The gate consists of a 3-junction-SQUID coupled with an RF-SQUID inductively. According to numerical simulation, the wide bias margin reached /spl plusmn/52%. Adopting the magnetic coupling to apply input signals, the fan-out larger than unity was obtained without reducing signal current level. These consequences enabled us to realize complicated logic functions using this gate, The gate delay was 4.5ps at Jc=10kA/cm/sup 2/. An EXOR gate composed of two gates had the bias margin of /spl plusmn/35% and the delay time of 12ps. The operation in non-latching mode is also suitable for digital circuits based on HTS junctions.

Keywords

SQUIDs; logic gates; superconducting logic circuits; EXOR gate; HTS; RF-SQUID; SQUID gate; digital circuit; fan-out; inductive coupling; logic circuit; magnetic coupling; nonlatching gate; numerical simulation; superconducting quantum interference device; three-junction-SQUID; Coupling circuits; Delay; Interference; Logic circuits; Logic functions; Numerical simulation; SQUIDs; Superconducting devices; Superconducting logic circuits; Superconducting magnets;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.622067

Filename

622067