Channel equalized DC squid flux-locked loop

Details Channel equalized DC squid flux-locked loop Channel equalized DC squid flux-locked loop

1993-07-26

1995-02-07

O'Shea, Sandra L.

Electricity: measuring and testing

Magnetic

Magnetometers

505846, 327527, G01R 33035, H01L 3924

Patent

active

053878647

ABSTRACT:
A DC superconductor quantum interference device (i.e. DC SQUID) is used in a flux-locked loop as a sensitive detector of magnetic flux. Prior art devices of this sort had a transfer function which was frequency-limited by the transfer function of impedance matching circuitry which is used to connect the DC SQUID with the first preamplifier, which amplifies the DC SQUID signal before it is applied to a detector circuit. The present invention corrects this frequency limitation by creating a compensating circuit having a transfer function which is the inverse of that of the impedance matching circuitry, and inserting it in the system after the first preamplifier and before the detector circuit.

REFERENCES:
patent: 4004217 (1977-01-01), Giffard
patent: 4389612 (1983-06-01), Simmonds et al.
patent: 4509018 (1985-04-01), Gershenson
patent: 4549135 (1985-10-01), Vaidya
patent: 5027069 (1991-06-01), Roehrlein
patent: 5095270 (1992-03-01), Ludeke
Clark, "Principles and Applications of SQUIDs" Proc IEEE, Aug. 1989.
Gershenson, Meir, et al, "High Slew Rate `Channel Equalized` DC SQUID Flux ocked Loop", presented Aug. 24, 1992 at 1992 Applied Superconductivity Conference.

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