Coherent array of Josephson oscillators with external bias leads

Details Coherent array of Josephson oscillators with external bias leads Coherent array of Josephson oscillators with external bias leads

1981-04-29

1984-09-04

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Significant distributed parameter resonator

331 50, 331 56, 307306, H03B 1500, H01L 3914

Patent

active

044700237

ABSTRACT:
A coherent array of Josephson oscillators is provided. Individual hysteresis-free Josephson junctions are longitudinally arranged in a line and have such a spacing as to substantially eliminate quasiparticle interactions. To provide a common frequency of operation, equal and opposite dc voltages are produced in adjacent pairs of the Josephson junctions by an arrangement of interlocking dc SQUID's (Superconductive Quantum Interference Device) connected to transversely extending biasing leads. Phase coherence for the array is provided by a rf current circulating in an inductive feedback path that loops between the ends of the array.

REFERENCES:
patent: 4249094 (1981-02-01), Fulton
patent: 4344052 (1982-08-01), Davidson
Likharev, K. et al., "Mutual Phase Locking in Multijunction Josephson Arr" IEEE Transactions On Magnetics, vol. MAG-17, No. 1, pp. 111-114, Jan. 1981.
Sandell, R. D., et al., "Flux Modulated Coherent Radiation from Arrays of Josephson Microbridges Coupled by Superconducting Loops", IEEE Trans. on Magnetics, vol. Mag 15, No. 1, Jan. 1979, pp. 462-464.
Jain, A. K., et al., "Observation of Phase Coherence Among Multiple Josephson Oscillators" Appl. Phys. Lett. 36(9), May 1, 1980, pp. 774-776.
Hansen, J. B., et al., "Coherent Arrays of Thin-Film Josephson Microbridges" IEEE Trans. on Magnetics, vol. Mag 17, No. 1, Jan. 1981, pp. 95-98.
Jain, A. K., et al., "Microwave Wideband Tunable Oscillators Using Coherent Arrays of Josephson Junctions" IEEE Trans. on Magnetics, vol. Mag 17, No. 1, Jan. 1981, pp. 99-102.

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