High symmetry dc SQUID system

Details High symmetry dc SQUID system High symmetry dc SQUID system

1990-08-31

1991-10-01

Hille, Rolf

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

505 1, 505702, 505828, 505832, 505845, 505846, 324247, 324248, H01L 3922, G01R 3302, G01R 33035, G11C 1144

Patent

active

050538349

ABSTRACT:
A thin film dc SQUID and its driving electronic circuitry configured with very high symmetry. The SQUID loop is formed with four holes at the respective ends of crossed slits. Each of these holes forms a single turn secondary for symmetrically arranged pairs of modulation coils and signal coils. The geometrical placement of the modulation coil transformers with respect to the signal coil transformers results in a device which nominally has no mutual inductance between the two groups of coils when the SQUID is biased for normal operation. The external driving circuit is configured to preserve the highly balanced nature of the chip and forces equal magnitudes of current to flow in all four of the bias leads.

REFERENCES:
patent: 4117503 (1978-09-01), Zappe
patent: 4389612 (1983-06-01), Simmonds et al.
patent: 4509018 (1985-04-01), Gershenson
patent: 4588947 (1986-05-01), Ketchen
patent: 4761611 (1988-08-01), Hoenig
patent: 4771239 (1988-09-01), Hoenig
patent: 4947118 (1990-08-01), Fujimaki

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