High-speed Josephson integrated circuit technology

Conference · Wed Mar 01 04:00:00 EST 1989 · IEEE Trans. Magn.; (United States)

OSTI ID:6044234

Hassuo, S

Josephson junctions with Nb/AlOx/Nb structures exhibit excellent characteristics with a low leakage current, and are stable with respect to thermal cycling and long term storage. The authors used niobium junctions in a variety of high-speed circuits. This paper describes recent progress with high-speed integrated circuits using niobium junctions. First, the authors briefly describe the circuit fabrication proceeds, and then they introduce their Modified Varialbe Threshold Logic (MVTL) gate family. The lowest experimentally obtained MVTL-OR gate delay was only 2.5 ps with a power consumption of 17 ..mu..Wgate. This gate family is used in various high-speed logic circuits, such as 8-bit shift registers, 16-bit ALUs (Arithmetic Logic Unit), and 4-bit microprocessors. They confirmed the high speed operation of less than 10 ps per gate on average for these circuits. They also developed a new high-sensitivity magnetic sensor using the SQUID (Superconducting QUantum Interference Device). It is called a single-chip SQUID magnetometer because the feedback circuit, which is operated at room temperature in a conventional SQUID system, has been integrated on the same chip as the SQUID sensor itself.

• Research Organization: Fujitsu Labs. Ltd., Atsugi Fujitsu Ltd., 10-1, Morinosato-Wakamiya, Atsugi, 243-01 (JP)
• OSTI ID: 6044234
• Report Number(s): CONF-880812-
• Conference Information: Journal Name: IEEE Trans. Magn.; (United States) Journal Volume: 25:2
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
42 ENGINEERING
420201* -- Engineering-- Cryogenic Equipment & Devices
420800 -- Engineering-- Electronic Circuits & Devices-- (-1989)
656100 -- Condensed Matter Physics-- Superconductivity
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
COMPUTERS
CURRENTS
DATA ACQUISITION SYSTEMS
ELECTRIC CURRENTS
ELECTRONIC CIRCUITS
ELECTRONIC EQUIPMENT
ELEMENTS
EQUIPMENT
FABRICATION
FEEDBACK
FLUXMETERS
INTEGRATED CIRCUITS
JOSEPHSON JUNCTIONS
JUNCTIONS
LEAKAGE CURRENT
LOGIC CIRCUITS
MAGNETOMETERS
MATERIALS TESTING
MEASURING INSTRUMENTS
METALS
MICROELECTRONIC CIRCUITS
MICROPROCESSORS
MICROWAVE EQUIPMENT
NIOBIUM
OXIDES
OXYGEN COMPOUNDS
PERFORMANCE
SQUID DEVICES
SUPERCONDUCTING DEVICES
SUPERCONDUCTING JUNCTIONS
TECHNOLOGY ASSESSMENT
TESTING
THERMAL CYCLING
TRANSITION ELEMENTS