Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1977-06-30
1978-09-26
Zazworsky, John
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307212, 307277, H03K 19195
Patent
active
041173546
ABSTRACT:
Josephson junction interferometers having nonlinear switching or threshold characteristics are disclosed. The nonlinear threshold characteristic is achieved in a preferred manner by applying an injection current to the interferometer at a point on the interferometer which is different from where its gate current is normally applied. The resulting nonlinearity provides for high amplification. The nonlinear switching characteristic may also be achieved by applying an injection current to the same point on the interferometer where the gate current is normally applied. However, a portion of the thus-applied injection current is electromagnetically coupled to the interferometer inductance to achieve the desired nonlinear switching characteristic. Parameters such as the injection current, the gate current, physical point of application of the injection current to the interferometer, junction currents and the inductance of the interferometer may be changed to tailor the threshold characteristic to provide a desired nonlinearity. Logic circuits such as AND, OR and INHIBIT circuits in addition to the basic amplifier circuit are also disclosed.
REFERENCES:
patent: 3281609 (1966-10-01), Rowell
W. Anacker et al., "Double Flux Quantum Cell without Bias Line" IBM Technical Disclosure Bulletin vol. 19, No. 3, Aug. 1976, pp. 1096-1097.
F. Basavaiah, "Shaping the Gate Current Versus the Control Characteristics of Nonlinear Gates" IBM Technical Disclosure Bulletin vol. 15, No. 5, Oct. 1972, pp. 1604-1605.
T. A. Fulton et al., "A Josephson Logic Design Employing Current Switched Junction" IEEE Transactions on Magnetics vol. MAG-13, No. 1, Jan. 1977, pp. 56-58.
J. Clarke et al., "Josephson Junction Amplifier" Applied Physics Letters vol. 19, No. 11, Dec. 1, 1971, pp. 469-471.
International Business Machines - Corporation
Kilgannon, Jr. Thomas J.
Zazworsky John
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