Logic operation at 5 Gb/s of an output interface for single-flux-quantum systems

Author

Harada, Naoki ; Yoshikawa, Nobuyuki ; Yoda, Kenichi ; Yoshida, Akira ; Yokoyama, Naoki

Author_Institution

Fujitsu Ltd., Atsugi, Japan

Volume

13

Issue

3

fYear

2003

Firstpage

3814

Lastpage

3816

Abstract

High-speed logic operation of an output interface circuit for a single-flux-quantum (SFQ) system was demonstrated at a data rate of 5 Gb/s. Using NEC´s 2.5-kA/cm² Nb junction process, we designed, fabricated, and tested the interface circuit consisting of a 2-b SFQ demultiplexer and two Josephson latching drivers. We verified the proper operation of the demultiplexer. The interface can convert 5-Gb/s SFQ-pulse data into two-channel 2.5-Gb/s return-to-zero data with an amplitude of approximately 6 mV.

Keywords

demultiplexing equipment; flip-flops; high-speed integrated circuits; niobium; superconducting logic circuits; 2.5 Gbit/s; 5 Gbit/s; Josephson latching drivers; NEC Nb junction process; Nb-Al-AlO_x-Nb; SFQ demultiplexer; SFQ-pulse data; amplitude; demultiplexer; flip-flop cells; high-speed logic operation; logic operation; output interface circuit; single-flux-quantum systems; two-channel return-to-zero data; Circuit testing; Educational technology; Flip-flops; Frequency measurement; Josephson junctions; Logic circuits; Logic testing; National electric code; Niobium; Superconducting transmission lines;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2003.816901

Filename

1230245