The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 16, 1989
Filed:
Jun. 28, 1988
William J Gallagher, Ardsley, NY (US);
Stanley I Raider, Briarcliff Manor, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A switch is provided that introduces quasiparticles at an asymmetric location into a reduced cross-sectional area microbridge link that is part of an output path. The quasiparticles nucleate a small region of normal resistivity and the normal region propagates to produce normal resistivity in the entire reduced cross-sectional area microbridge link. The asymmetry of the location provides input-output isolation. The high critical current, high resistivity material for the reduced cross-section member provides high current and voltage gain and the small size provides high speed. In one structure, an input film conductor is asymmetrically, centrally positioned in an insulator stack and a microbridge like is positioned on a beveled side of the stack with the input conductor in tunneling relationship with part of the narrow portion of the microbridge link. Decoupling between input and output sufficient to permit one switch to drive several others is provided. Voltage gain can be sufficient to serve as an interface between superconducting device and semiconductor circuitry.