A cell-based design approach for RSFQ circuits based on binary decision diagram

Author

Koshiyama, Junichi ; Yoshikawa, Nobuyuki

Author_Institution

Div. of Electr. & Comput. Eng., Yokohama Nat. Univ., Japan

Volume

11

Issue

1

fYear

2001

fDate

3/1/2001 12:00:00 AM

Firstpage

263

Lastpage

266

Abstract

We have proposed a cell-based design approach for rapid single flux quantum (RSFQ) logic circuits. In our design approach, a binary decision diagram (BDD) is used for representation of logical functions in order to reduce the number of gates. We have made a standard cell library, which is composed of only five basic cells. We add one-junction Josephson transmission line (JTL) to the edge of the input and the output node of some basic cells, by which no deterioration of the DC bias margin is observed for the connection of each cell. In the layout level, the size and the position of the input/output node of each cell are equalized. The standard cell circuits were fabricated by NEC 2.5 kA/cm² and Hypres 1.0 kA/cm² Nb standard process and they were tested at low speed

Keywords

binary decision diagrams; cellular arrays; logic design; superconducting logic circuits; Josephson transmission line; Nb; RSFQ logic circuit; binary decision diagram; standard cell design; Binary decision diagrams; Boolean functions; Circuit testing; Clocks; Data structures; Design methodology; Libraries; Logic circuits; Logic functions; Switches;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.919334

Filename

919334