DC-squid electronics based on adaptive positive feedback: Experiments

Heikki Seppä, Antti Ahonen, Jukka Knuuttila, Juha Simola, Visa Vilkman

    Research output: Contribution to journalArticleScientificpeer-review

    38 Citations (Scopus)


    It is shown that DC-SQUID read-out electronics can be realized utilizing positive feedback without deteriorating the SQUID noise performance. The required gain rise is achieved by interconnecting the SQUID output and a flux modulation coil via a cooled FET acting as a voltage-controlled resistor; different SQUIDs with different types of FETs have been studied experimentally. Possible ways of adaptively controlling the feedback gain produced by the positive feedback are briefly discussed.
    Original languageEnglish
    Pages (from-to)2488 - 2490
    Number of pages3
    JournalIEEE Transactions on Magnetics
    Issue number2
    Publication statusPublished - 1991
    MoE publication typeA1 Journal article-refereed


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