DC-SQUID electronics based on the noise cancellation scheme

    Research output: Contribution to journalArticleScientificpeer-review

    32 Citations (Scopus)

    Abstract

    We have constructed a compact dc SQUID electronics unit, in which the noise of the room-temperature amplifier is measured by the SQUID and cancelled out. This makes it unnecessary to use a transformer and a modulation scheme to achieve noise matching between the SQUID and the amplifier. The electronics unit contains a PI/sup 3/2/-controller and it has demonstrated a bandwidth of 100 kHz, a 1.2 /spl mu//spl Phi//sub 0///spl radic/(Hz) white noise level and a 1/f noise corner of 0.3 Hz in a flux-locked loop mode. The design criteria for the noise-cancelled electronics are discussed, including the problem of excess noise.<>
    Original languageEnglish
    Pages (from-to)2146-2148
    JournalIEEE Transactions on Applied Superconductivity
    Volume5
    Issue number2
    DOIs
    Publication statusPublished - 1995
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    SQUIDs
    cancellation
    Electronic equipment
    direct current
    electronics
    White noise
    amplifiers
    Modulation
    Fluxes
    Bandwidth
    Controllers
    white noise
    transformers
    controllers
    bandwidth
    modulation
    room temperature
    Temperature

    Cite this

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    title = "DC-SQUID electronics based on the noise cancellation scheme",
    abstract = "We have constructed a compact dc SQUID electronics unit, in which the noise of the room-temperature amplifier is measured by the SQUID and cancelled out. This makes it unnecessary to use a transformer and a modulation scheme to achieve noise matching between the SQUID and the amplifier. The electronics unit contains a PI/sup 3/2/-controller and it has demonstrated a bandwidth of 100 kHz, a 1.2 /spl mu//spl Phi//sub 0///spl radic/(Hz) white noise level and a 1/f noise corner of 0.3 Hz in a flux-locked loop mode. The design criteria for the noise-cancelled electronics are discussed, including the problem of excess noise.<>",
    author = "Mikko Kiviranta and Heikki Sepp{\"a}",
    year = "1995",
    doi = "10.1109/77.403007",
    language = "English",
    volume = "5",
    pages = "2146--2148",
    journal = "IEEE Transactions on Applied Superconductivity",
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    publisher = "IEEE Institute of Electrical and Electronic Engineers",
    number = "2",

    }

    DC-SQUID electronics based on the noise cancellation scheme. / Kiviranta, Mikko; Seppä, Heikki.

    In: IEEE Transactions on Applied Superconductivity, Vol. 5, No. 2, 1995, p. 2146-2148.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - DC-SQUID electronics based on the noise cancellation scheme

    AU - Kiviranta, Mikko

    AU - Seppä, Heikki

    PY - 1995

    Y1 - 1995

    N2 - We have constructed a compact dc SQUID electronics unit, in which the noise of the room-temperature amplifier is measured by the SQUID and cancelled out. This makes it unnecessary to use a transformer and a modulation scheme to achieve noise matching between the SQUID and the amplifier. The electronics unit contains a PI/sup 3/2/-controller and it has demonstrated a bandwidth of 100 kHz, a 1.2 /spl mu//spl Phi//sub 0///spl radic/(Hz) white noise level and a 1/f noise corner of 0.3 Hz in a flux-locked loop mode. The design criteria for the noise-cancelled electronics are discussed, including the problem of excess noise.<>

    AB - We have constructed a compact dc SQUID electronics unit, in which the noise of the room-temperature amplifier is measured by the SQUID and cancelled out. This makes it unnecessary to use a transformer and a modulation scheme to achieve noise matching between the SQUID and the amplifier. The electronics unit contains a PI/sup 3/2/-controller and it has demonstrated a bandwidth of 100 kHz, a 1.2 /spl mu//spl Phi//sub 0///spl radic/(Hz) white noise level and a 1/f noise corner of 0.3 Hz in a flux-locked loop mode. The design criteria for the noise-cancelled electronics are discussed, including the problem of excess noise.<>

    U2 - 10.1109/77.403007

    DO - 10.1109/77.403007

    M3 - Article

    VL - 5

    SP - 2146

    EP - 2148

    JO - IEEE Transactions on Applied Superconductivity

    JF - IEEE Transactions on Applied Superconductivity

    SN - 1051-8223

    IS - 2

    ER -