Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1982-03-29
1985-01-29
Zazworsky, John
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
357 5, H03K 338, H03K 1792
Patent
active
044968540
ABSTRACT:
A superconducting circuit including at least two DC SQUID stages integrated on the same superconducting chip and coupled by a circuit providing efficient transfer of current from the first SQUID stage to the second SQUID stage with large bandwidth. Each SQUID stage is comprised of a superconducting loop having at least two Josephson devices therein, there being shunt resistors across the Josephson devices to render them nonhysteretic. The coupling means between stages is directly connected to the shunt resistors of the first stage and includes a transmission line and an impedance circuit for matching the impedance of the transmission line, where the impedance circuit provides a real impedance over a large frequency range up to approximately the frequency of Josephson oscillation of the Josephson devices in DC SQUID. Feedback from the second SQUID stage to the first SQUID stage improves the input dynamic range and linearity of the circuit.
REFERENCES:
patent: 4051393 (1977-09-01), Fulton
patent: 4280095 (1981-07-01), Hinton
W. Baechtold et al., "Nonlatching Logic Circuit Using Josephson Junctions," IBM Technical Disclosure Bulletin, vol. 18, No. 12, May 1976, p. 4167.
T. R. Cheewala et al., "Josephson Long-Line Receiver," IBM Technical Disclosure Bulletin, vol. 24, No. 1A, Jun. 1981, p. 260.
IEEE Transactions on Magnetics, vol. MAG 17, No. 1, Jan. 19, 1981, pp. 395-399, R. F. Voss et al., "Ultra Low Noise Nb DC SQUIDS".
M. B. Ketchen et al., "Low Frequency Noise in Small-Area Tunnel Junction SQUIDS" Proceedings of the Second International Conf. of Superconducting Quantum Devices, May 6-9, 1980, pp. 227-236.
J. M. Jaycox et al., "Planar Coupling Scheme for Ultra Low Noise DC SQUIDS" IEEE Transactions on Magnetics, vol. MAG 17, No. 1, Jan. 1981, pp. 400-403.
Chi Cheng-Chung J.
Davidson Arthur
Tsuei Chang-Chyi
International Business Machines - Corporation
Kling Carl C.
Stanland Jackson E.
Zazworsky John
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