A subnanosecond clock Josephson 4-bit processor

Journal Article · Thu Feb 01 00:00:00 EST 1990 · IEEE Journal of Solid-State Circuits (Institute of Electrical and Electronics Engineers); (USA)

DOI:https://doi.org/10.1109/4.50293· OSTI ID:6877211

Kotani, S; Imamura, T; Hasuo, S ^[1]

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1. Fujitsu Ltd., Tokyo (Japan)

The authors have constructed a Josephson 4-bit processor with a 4-bit slice microprocessor, a 4-bit multiplier, a 12-bit accumulator, an 8-kbit ROM, and a sequencer. The chip was fabricated with 1.5 {mu}m all-niobium technology, and contains 24000 Nb/AlO{sub {ital x}}/Nb Josephson junctions. The processor was designed using a bit slice structure and a simple ripple-carry method, and has a data sequence based on a three-stage pipeline. Experiments confirmed that the processor functions operated correctly. From the critical path measurements for each stage, the ROM has a 100-ps access time, the microprocessor can be clocked at 1.1 GHz, and the multiplier has a 200-ps multiplication time. The power dissipation of the chip was 6.1 mW.

• OSTI ID: 6877211
• Journal Information: IEEE Journal of Solid-State Circuits (Institute of Electrical and Electronics Engineers); (USA), Vol. 25:1; ISSN 0018-9200
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
JOSEPHSON JUNCTIONS
FABRICATION
NIOBIUM
MEMORY DEVICES
PARALLEL PROCESSING
ALUMINIUM OXIDES
MICROPROCESSORS
ALUMINIUM COMPOUNDS
CHALCOGENIDES
COMPUTERS
ELECTRONIC CIRCUITS
ELEMENTS
JUNCTIONS
METALS
MICROELECTRONIC CIRCUITS
OXIDES
OXYGEN COMPOUNDS
PROGRAMMING
SUPERCONDUCTING JUNCTIONS
TRANSITION ELEMENTS
426001* - Engineering- Superconducting Devices & Circuits- (1990-)
990200 - Mathematics & Computers