A fast Josephson SFQ shift register

Author

Kuo, F. ; Whiteley, S.R. ; Faris, S.M.

Author_Institution

HYPRES Inc., Elmsford, NY, USA

Volume

25

Issue

2

fYear

1989

fDate

3/1/1989 12:00:00 AM

Firstpage

841

Lastpage

844

Abstract

A Josephson SFQ (single flux quantum) shift register circuit operating under a two-phase power was designed and tested. The test cell was fabricated using the Nb/AlO_x/Nb junction SNEAP process. The main data latch is DC biased; the data storage is accomplished by the transfer of a single flux quantum in or out of a SQUID (superconducting quantum interference device) superconducting loop. A two-phase sinusoidal clock with offset is used to operate the circuit. Simulations verify that the operating frequency can go beyond 70 GHz, with operating margins exceeding 20%. Preliminary measurements indicate that the circuit operates as intended

Keywords

aluminium compounds; niobium; shift registers; superconducting junction devices; superconducting logic circuits; 70 GHz; DC biased; Josephson SFQ shift register; Nb-AlO_x-Nb junctions; SNEAP process; SQUID; data latch; data storage; offset; operating frequency; operating margins; shift register circuit; single flux quantum; superconducting quantum interference device; test cell; two-phase power; two-phase sinusoidal clock; Circuit testing; Clocks; Interference; Josephson junctions; Latches; Memory; Niobium; SQUIDs; Shift registers; Superconducting devices;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.92417

Filename

92417