Subterranean power lines in high-density integrated Josephson circuits

Author

Shiota, T. ; Kotani, S. ; Imamura, T.

Author_Institution

Fujitsu Labs. Ltd., Atsugi, Japan

Volume

5

Issue

1

fYear

1995

fDate

3/1/1995 12:00:00 AM

Firstpage

31

Lastpage

36

Abstract

We found from simulations that wide power lines are required to make bias currents of Josephson gates uniform. Magnetic noise due to large power current decreases the critical current of the adjacent gate. To enhance circuit integration and to stabilize circuit operation, we proposed a power line laid under the ground plane. The gates can be located above the power line inserting the ground plane. The new power line can make whole chip areas active for gates however wide the line is. We confirmed that the ground plane shields the gates from magnetic noise. We fabricated some test circuits using the new power lines and confirmed their operations.<>

Keywords

critical currents; magnetic noise; magnetic shielding; power supply circuits; superconducting device noise; superconducting integrated circuits; Josephson gates; bias currents; circuit integration; critical current; ground plane; high-density integrated Josephson circuits; magnetic noise; shielding; simulations; subterranean power lines; Circuit simulation; Circuit testing; Current supplies; Impedance; Josephson junctions; Logic gates; Magnetic fields; Magnetic noise; Power generation; Superconducting logic circuits;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.384566

Filename

384566