Superconductor logic and switching circuits

Details Superconductor logic and switching circuits Superconductor logic and switching circuits

1992-10-15

1994-09-06

Westin, Edward P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307245, 307541, 341171, H03K 19195, H03K 1792

Patent

active

053451147

ABSTRACT:
Current controlled superconductor switches formed by reactive patterning or other fabrication techniques may be used to form logic circuits including OR, AND, NOR, NAND, and NOT gates, a circuit breaker or an analog-to-digital converter. Each switch contains a superconductor resistor electrically connected in parallel with a non-superconductor resistor. The superconductor resistor has a critical current I.sub.c, such that it exhibits no electrical resistance to current flow less than I.sub.c, and exhibits positive electrical resistance to current flow greater than or equal to I.sub.c. The switch can accordingly be toggled between two states (i.e. superconducting and non-superconducting) by suitably controlling the current flowing through the switch. This switching behaviour provides the basis for constructing logic gates and other digital circuit devices.

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patent: 4754384 (1988-06-01), Levy et al.
patent: 4963582 (1990-10-01), Drehman
patent: 4963852 (1990-10-01), Drehman
"Current Controlled High T.sub.c Superconducting Switch", Q. Y. Ma et al., Cryogenics, 30, p. 1146, (1990).
"Novel method of patterning YBaCuO superconducting thin films", Q. Y. Ma et al. Appl. Phys. Lett., 55, p. 896, (1989).
"Characterization of bilayer-metal contacts to high T.sub.c superconducting films", Q. Y. Ma et al, J. Vac. Sci. Technol. A9(3) p. 390, (1991).

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