Binary circuitry including switching elements utilizing superconductive tunneling effects

Patent · Tue Apr 27 04:00:00 EDT 1976

OSTI ID:7361494

Baechtold, W; Gueret, P L

Two Josephson gates are connected in series to a low impedance voltage source. Each junction is bridged by a load impedance. The feed voltage is maintained in the order of the gap voltage which correponds to the voltage drop across a Josephson junction when it is in its single-particle-tunneling state. Therefore, only one out of both Josephson elements can exist in the voltage state at a time, and the other junction is forced to assume the superconducting pair-tunneling state. In its symmetric form, the basic circuit can be used as flip-flop or storage means. If asymmetric, the basic circuit shows monostable switching behavior, and it can be used as logic gate. Circuit asymmetry can be caused either by design using different junction areas or electrically by proper bias control currents applied to either or both gates of the basic circuit. The degree of symmetry or asymmetry can even be shifted with electrical means. AND and OR gates and inverting embodiments which perform logic NAND and NOR functions are shown.

• Assignee: International Business Machines Corp.
• Patent Number(s): US 3953749
• OSTI ID: 7361494
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420201 -- Engineering-- Cryogenic Equipment & Devices
420800* -- Engineering-- Electronic Circuits & Devices-- (-1989)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COMPUTERS
DESIGN
ELECTRICAL EQUIPMENT
ELECTRONIC CIRCUITS
EQUIPMENT
FLIP-FLOP CIRCUITS
GATING CIRCUITS
JOSEPHSON JUNCTIONS
LOGIC CIRCUITS
MULTIVIBRATORS
PULSE CIRCUITS
SUPERCONDUCTING JUNCTIONS
SWITCHES
TUNNEL EFFECT