Apparatus for reducing low frequency noise in dc biased SQUIDS

Details Apparatus for reducing low frequency noise in dc biased SQUIDS Apparatus for reducing low frequency noise in dc biased SQUIDS

1980-06-17

1983-06-21

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetometers

G01R 3302

Patent

active

043896120

ABSTRACT:
A circuit for reducing low frequency noise in a direct current biased superconducting quantum interference device. A squarewave bias signal having no dc component is used to bias the two junctions of the dc SQUID. At the same time, the magnetic flux in the SQUID is modulated to heterodyne the input signals up to some convenient frequency where they may be amplified without concern for drift. Final demodulation automatically adjusts for the fact that the relative phase is reversed each time the squarewave bias changes polarity states.

REFERENCES:
patent: 3528005 (1970-09-01), Morse et al.

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