Single frequency noise reduction circuit for squids

Details Single frequency noise reduction circuit for squids Single frequency noise reduction circuit for squids

1985-11-06

1987-05-05

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Magnetometers

307306, G01R 33035

Patent

active

046635904

ABSTRACT:
A two-junction DC SQUID is supplied a single square-wave frequency signal that both biases the SQUID and provides modulation with a square-wave train that is 90.degree. phase displaced with respect to the bias square-wave train in order to eliminate low frequency noise with cross-modulation frequency products.

REFERENCES:
patent: 3221273 (1965-11-01), Livingston
patent: 3450899 (1969-06-01), Knight
patent: 3725819 (1973-04-01), Fulton
patent: 4389612 (1983-06-01), Simmonds et al.
patent: 4585999 (1986-04-01), Hilbert et al.
Yamashita et al., "RF-SQUID Magnetometer Biased by Harmonic", J. Appl. Phys., Jul. 1979, pp. 4503-4508.

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