Superconducting current injection transistor with very high critical-current-density edge-junctions

Conference · Fri Mar 01 04:00:00 EST 1985 · IEEE Trans. Magn.; (United States)

OSTI ID:6389207

Van Zeghbroeck, B J

A Superconducting Current Injection Transistor (Super-CIT) was fabricated with very high critical current-density edge-junctions. The junctions have a niobium base electrode and a lead-alloy counter electrode. The length of the junctions is 30..mu..m and the critical-current density is 190KA/cm/sup 2/. The Super-CIT has a current gain of 2, a large signal transresistance of 100mV/A and the turn-on delay, inferred from the junction resonance, is 7ps. The power dissipation is 3.5..mu..W and the power-delay product is 24.5aJ. Gap reduction due to heating was observed, limiting the maximum power dissipation per unit length to 1.1..mu..W/..mu..m. Compared to lead-alloy Super-CITs the device is five times smaller, three times faster and has a three times larger output voltage. The damping resistor and the contact junction could also be eliminated.

• Research Organization: Department of Electrical Engineering, University of Colorado, Boulder, CO
• OSTI ID: 6389207
• Report Number(s): CONF-840937-
• Conference Information: Journal Name: IEEE Trans. Magn.; (United States) Journal Volume: MAG-21:2
• Country of Publication: United States
• Language: English

Related Subjects

420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALLOYS
CRITICAL CURRENT
CURRENT DENSITY
CURRENTS
ELECTRIC CURRENTS
ELECTRICAL EQUIPMENT
ELEMENTS
ENERGY GAP
ENERGY LOSSES
EQUIPMENT
FABRICATION
JUNCTIONS
LEAD ALLOYS
LOSSES
METALS
NIOBIUM
PERFORMANCE
POWER LOSSES
RESISTORS
SEMICONDUCTOR DEVICES
SEMICONDUCTOR RESISTORS
SUPERCONDUCTING DEVICES
SUPERCONDUCTING JUNCTIONS
TRANSISTORS
TRANSITION ELEMENTS