A new simulator for Josephson circuits with lossy transmission lines

Author

Morisue, M. ; Hayashi, S. ; Kanasugi, A. ; Van Duzer, T.

Author_Institution

Dept. of Electron. Eng., Saitama Univ., Urawa, Japan

Volume

27

Issue

2

fYear

1991

fDate

3/1/1991 12:00:00 AM

Firstpage

2906

Lastpage

2909

Abstract

A network simulator for Josephson circuits is described, and its performance is compared with SPICE. The proposed simulator can simulate large-scale networks containing either lossy or lossless transmission lines and nonlinear lumped elements such as Josephson junctions. The transmission line treatment is completely general, but with constant distributed parameters, and all lumped elements may be nonlinear. Attention is focused on the simulation of the transmission lines; the technique for this simulation is based on the linearity of the elements of the transmission line. The propagating waves are divided into short pulses represented by the sum of two step functions delayed with respect to each other. The equations for the treatment of the transmission lines are given, and some example simulations are presented. Emphasis is placed on evaluation of the simulator in comparison with SPICE. It is shown that for circuits with long lossy transmission lines the simulator can be appreciably faster than SPICE, in which the lines would have to be represented by a cascade of lumped elements

Keywords

Josephson effect; circuit analysis computing; digital simulation; nonlinear network analysis; superconducting integrated circuits; superconducting junction devices; Josephson circuits; SPICE; distributed parameters; large-scale networks; lossy transmission lines; network simulator; nonlinear lumped elements; Circuit simulation; Distributed parameter circuits; Equations; Josephson junctions; Large-scale systems; Linearity; Propagation delay; Propagation losses; SPICE; Transmission lines;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.133817

Filename

133817