Ac biasing of a dc squid

Details Ac biasing of a dc squid Ac biasing of a dc squid

G - Physics

01

R

324/48, 324/59

G01R 33/035 (2006.01)

Patent

CA 1195734

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.

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