A direct readout high-T-c dc SQUID electronics with ac bias and a liquid-nitrogen-cooled preamplifier

Authors
Gudoshnikov, SA Matveets, LV Weidl, R Dorrer, L Seidel, P Krasnosvobodtsev, SI Kalabukhov, AS Snigirev, OV
Citation
Sa. Gudoshnikov et al., A direct readout high-T-c dc SQUID electronics with ac bias and a liquid-nitrogen-cooled preamplifier, IEEE APPL S, 9(2), 1999, pp. 4397-4399
Citations number
4
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
ISSN journal
10518223 → ACNP
Volume
9
Issue
2
Year of publication
1999
Part
3
Pages
4397 - 4399
Database
ISI
SICI code
1051-8223(199906)9:2<4397:ADRHDS>2.0.ZU;2-#
Abstract
Direct readout de SQUID electronics based on a liquid-nitrogen-cooled pream plifier and alternating current bias was developed. The preamplifier with a n intrinsic voltage noise of 0.18 nV/Hz(1/2) was used as the first stage of this electronics. A mathematical description of the noise suppression by t his electronics was done. Low-frequency noise was reduced by a factor of 6 at 1 Hz by this technique.