Digital squid system adaptive for integrated circuit constructio

Details Digital squid system adaptive for integrated circuit constructio Digital squid system adaptive for integrated circuit constructio

1988-11-21

1990-08-07

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetometers

307306, 505846, G01R 33035

Patent

active

049471180

ABSTRACT:
A SQUID system, such as a SQUID magnetometer, including a SQUID and a bias circuit supply a pulsed bias current to cause an output of a pulsed output from an injection point in the SQUID. The SQUID has a predetermined threshold characteristic which is asymmetrical with respect to a coordinate defined by a current to be measured and flowing through a first junction line and the bias current. The bias current supplied from the bias circuit comprises pulses which are alternately positive polarity pulses and negative polarity pulses, and has a first frequency. The threshold characteristic and the bias current are defined to output an output signal comprising pulses, the number thereof being proportional to the current to be measured and a polarity thereof corresponding to a polarity of the current to be measured.

REFERENCES:
patent: 4389612 (1983-06-01), Simmonds et al.
patent: 4663590 (1987-05-01), Gershenson et al.
patent: 4672359 (1987-06-01), Silver
D. Drung, Digital Feedback Loops for d.c. Squids, pp. 623-627, Cryogenics 1986, vol. 26, Nov.
D. Drung, Experimental Gradiometer with a digital feedback loop Extended Abstract of 1987 International Superconductivity Electronics Conference (ISEC'87) Aug., 1987, Tokyo, pp. 21-24.
Harada et al., "Experimental Result of QFP (part 2)", Third Symposium of Rikagaku Research Institute, pp. 53-58, Mar. 19, 1986.

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