Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1974-12-02
1976-04-27
Zazworsky, John
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307212, 307306, 357 5, H03K 338
Patent
active
039537498
ABSTRACT:
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 corresponds 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.
REFERENCES:
patent: 3093749 (1963-06-01), Dillingham
patent: 3458735 (1969-07-01), Fiske
IBM Technical Disclosure Bulletin, Vol. 15, No. 11, Apr. 1973, pp. 3561-3562, "Josephson Device Level Converter", by H. C. Hamel
Baechtold Werner
Gueret Pierre L.
International Business Machines - Corporation
Kilgannon, Jr. Thomas J.
Zazworsky John
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