Title :
Digital logic circuits
Author :
Hasuo, Shinya ; Imamura, Takeshi
Author_Institution :
Fujitsu Ltd., Atsugi, Japan
fDate :
8/1/1989 12:00:00 AM
Abstract :
Recent progress in Josephson digital logic circuits is described. It is noted that changing the junction material from a lead alloy to niobium has dramatically improved process reliability, and that high-speed, low-power operations have been demonstrated at large-scale integrated-circuit levels. The first Josephson microprocessor, operated at 770 MHz, verified the potential of Josephson devices for future digital elements. The possibilities of the ultrafast Josephson computer, previously shelved because of a number of problems, are being actively reconsidered. The performance anticipated for Josephson digital circuits using high-temperature superconducting materials is also discussed
Keywords :
integrated logic circuits; microprocessor chips; superconducting junction devices; superconducting logic circuits; 770 MHz; Josephson digital logic circuits; Josephson microprocessor; high temperature superconductor; high-temperature superconducting materials; large-scale integrated-circuit levels; process reliability; ultrafast Josephson computer; Digital circuits; Integrated circuit reliability; Large scale integration; Lead; Logic circuits; Materials reliability; Microprocessors; Niobium alloys; Superconducting devices; Superconducting materials;
Journal_Title :
Proceedings of the IEEE
