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

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

Direct readout dc SQUID electronics based on a liquid-nitrogen-cooled preamplifier and alternating current bias was developed. The preamplifier with an intrinsic voltage noise of 0.18 nV/Hz super(1/2) was used as the first stage of this electronics. A mathematical description of the noise suppressio...

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Veröffentlicht in:IEEE transactions on applied superconductivity 1999-01, Vol.9 (2), p.4397-4399
Hauptverfasser: Gudoshnikov, SA, Matveets, LV, Weidl, R, Dorrer, L, Seidel, P, Krasnosvobodtsev, SI, Kalabukhov, A S, Snigirev, O V
Format: Artikel
Sprache:eng
Schlagworte:
Bias
Direct current
Electronics
Mathematical analysis
Noise
Preamplifiers
SQUIDs
Superconducting quantum interference devices
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Zusammenfassung:Direct readout dc SQUID electronics based on a liquid-nitrogen-cooled preamplifier and alternating current bias was developed. The preamplifier with an intrinsic voltage noise of 0.18 nV/Hz super(1/2) was used as the first stage of this electronics. A mathematical description of the noise suppression by this electronics was done. Low-frequency noise was reduced by a factor of 6 at 1 Hz by this technique
ISSN:1051-8223
DOI:10.1109/77.783999