Two-stage amplifier based on a double relaxation oscillation superconducting quantum interference device

A low-noise single-chip two-stage superconducting quantum interference device (SQUID) system with a double relaxation oscillation SQUID as the second stage has been realized. The system was operated in a direct voltage readout mode, with a closed loop bandwidth up to 1 MHz. Operated at 4.2 K, the wh...

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Veröffentlicht in:Applied physics letters 1999-10, Vol.75 (15), p.2316-2318
Hauptverfasser: Podt, M., van Duuren, M. J., Hamster, A. W., Flokstra, J., Rogalla, H.
Format: Artikel
Sprache:eng
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Zusammenfassung:A low-noise single-chip two-stage superconducting quantum interference device (SQUID) system with a double relaxation oscillation SQUID as the second stage has been realized. The system was operated in a direct voltage readout mode, with a closed loop bandwidth up to 1 MHz. Operated at 4.2 K, the white flux noise measured in flux locked loop was 1.3 μΦ0/√Hz, corresponding to an energy sensitivity of ε≈27h. Owing to the large flux-to-voltage transfer of up to 3.6 mV/Φ0, the room-temperature preamplifier noise did not dominate the overall flux noise.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.125001