Josephson signal detector, measurement device using the same, an

Details Josephson signal detector, measurement device using the same, an Josephson signal detector, measurement device using the same, an

1994-12-15

1997-07-08

O'Shea, Sandra L.

Electricity: measuring and testing

Magnetic

Magnetometers

505846, 341133, G01R 33035, G01R 3302, H03M 112

Patent

active

056465262

ABSTRACT:
A Josephson signal detector is presented which includes (1) a sensor with at least one Josephson junction (e.g., a SQUID) and (2) a comparator (e.g., an analog-to-digital converter); a measurement system using such detector; and a method of using such detector and measurement system. The detector can be, e.g., a digital SQUID. The detector can also include a readout circuit for reading out the output of the comparator. In one aspect of the invention, the sensor, or both the sensor and readout circuit, are powered by a DC current source. Through use of the DC current source, it is possible to provide, e.g., a digital SQUID, having reduced crosstalk and reduced fluctuation of ground potential, and which is kept from an increase in noise or a miss operation.

REFERENCES:
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patent: 5396242 (1995-03-01), Lee
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Applied Physics Letter, "Study on the Operation of a Dual Channel Digital Superconducting Quantum Interference Device with Direct-Current-Powered Josephson Multiplexer Readout", vol. 66, No. 12, Mar. 1995, pp. 1548-1550.
Fujitsu-Scientific and Technical Journal, "Josephson Integrated Circuits III A Single-Chip SQUID Magnetometer", vol. 27, No. 1, Apr. 1991, pp. 59-83.
Cryogenics, "High Slew Rate Gradiometer Prototype with Digital Feedback Loop of Variable Step Size", vol. 30, No. 4, Apr. 1990, pp. 330-334.
IEEE Transactions on Magnetics, "Measured Performance Parameters of Gradiometers with Digital Output", vol. 25, No. 2, Mar. 1989, pp. 1034-1037.
Cryogenics, "Digital Feedback Loops for d.c. SQUIDs", vo. 26, No. 11, Nov. 1986, pp. 623-627.

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