Oscillation of SFQ pulse in oxide JTL [Josephson transmission line]

Author

Tarutani, Yoshinobu ; Sugiyama, Hideyuki ; Tanabe, Keiichi

Author_Institution

Supercond. Res. Lab., Tokyo, Japan

Volume

13

Issue

2

fYear

2003

fDate

6/1/2003 12:00:00 AM

Firstpage

417

Lastpage

420

Abstract

Characteristics of SFQ signal propagation in oxide circuits were investigated by numerical simulation. The numerical simulation for the SFQ signal propagating in the Josephson transmission line (JTL) was performed by assuming the inductor to be a passive transmission line and by taking into account the high I_cR_n value of oxide junctions. The SFQ signal was found to oscillate when the inductor length was more than 20 μm. The origin of the oscillation and the oscillation conditions were investigated with respect to the Josephson plasma frequency. A shunt resistor connected between an inductor and the groundplane was found to be effective for suppressing the oscillation. The JTL in which shunt resistors are connected may also be used as a delay line.

Keywords

Josephson effect; circuit oscillations; numerical analysis; plasma oscillations; solid-state plasma; superconducting integrated circuits; superconducting transmission lines; 20 micron; JTL; Josephson plasma frequency; Josephson plasma oscillation; Josephson transmission line; SFQ signal propagation; delay line; numerical simulation; oscillation suppression; oxide circuits; shunt resistor; Distributed parameter circuits; Frequency; Inductors; Niobium; Numerical simulation; Pulse circuits; Resistors; Shunt (electrical); Space vector pulse width modulation; Superconducting transmission lines;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2003.813884

Filename

1211630