High dynamic range SQUID readout for frequency-domain multiplexers

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    Abstract

    A 16-SQUID array has been designed and fabricated, which shows 0.12 μΦ 0 Hz−1/2 flux noise at 4.2 K. The readout amplifier based on a cryogenic silicon-germanium bipolar transistor employs short-delay negative flux feedback and reaches 7 MHz bandwith for a 1 Φ 0p-p signal. The −1 dB compression is reached approximately at 4.2 Φ 0p-p amplitude when the signal frequency is 1 MHz. In the feedback mode the flux noise is anomalously increased to 0.35 μΦ 0 Hz−1/2.
    Original languageEnglish
    Pages (from-to)952 - 957
    Number of pages6
    JournalJournal of Low Temperature Physics
    Volume151
    Issue number3-4
    DOIs
    Publication statusPublished - 2008
    MoE publication typeA1 Journal article-refereed
    Event12th International Workshop on Low Temperature Detectors (LTD12) - Paris, France
    Duration: 22 Jul 200727 Jul 2007

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    Keywords

    • Cryogenic semiconductor amplifiers
    • SQUID arrays
    • SQUIDs

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