Title :
A 4 b Josephson data processor chip
Author :
Hatano, Y. ; Mori, H. ; Yamada, H. ; Nagaishi, H. ; Nakane, H. ; HIrano, M. ; Kawabe, U.
Author_Institution :
Hitachi Ltd., Tokyo, Japan
Abstract :
The authors describe a 4-bit Josephson data processor chip featuring on-chip control and data paths and near-GHz capability. It is a closed, stand-alone chip comprising a 4-bit data path and a control path and is aimed at high-speed digital signal processing. The die is 0.5 mm square, including pads, is fabricated using 2.5- mu m-rule Nb/AlO/sub x//Nb technology, and consists of 8454 Josephson junctions and 9027 resistors. The cross-shaped junction structure realizes critical current scattering of +or-6%, and a junction characteristic voltage V/sub m/ of 50 mV. A block diagram of the Josephson data processor is shown.<>
Keywords :
digital signal processing chips; large scale integration; superconducting logic circuits; 0.5 mm; 2.5 micron; 4 bit; 4-bit data path; 50 mV; Josephson data processor chip; Nb-AlO/sub x/-Nb; block diagram; control path; critical current scattering; cross-shaped junction structure; high-speed digital signal processing; junction characteristic voltage; on-chip control; stand-alone chip; Clocks; Crosstalk; Delay; Flip-flops; Niobium; Radio frequency; Read only memory; Registers; Resistors; Voltage;
Conference_Titel :
Solid-State Circuits Conference, 1989. Digest of Technical Papers. 36th ISSCC., 1989 IEEE International
Conference_Location :
New York, NY, USA
DOI :
10.1109/ISSCC.1989.48270
