Effect of parasitic capacitance on DC squid performance

Tapani Ryhänen, Robin Cantor, Dietmar Drung, Hans Koch, Heikki Seppä

    Research output: Contribution to journalArticleScientificpeer-review

    14 Citations (Scopus)


    The effect of parasitic capacitance Cp on DC SQUID characteristics and noise performance has been studied using a test structure consisting of 11 identical SQUID washers with Nb films of various widths covering the slit. The measured I-V characteristics are in good agreement with simulations based on a simple lumped circuit model. The energy resolution ε in seems to scale roughly according to in approximately ε ≈ γkBT √L(C+2Cp), where γ is a dimensionless constant, kB is the Boltzmann constant, T is the temperature, C is the junction capacitance, and L is the inductance.
    Original languageEnglish
    Pages (from-to)3013 - 3016
    Number of pages4
    JournalIEEE Transactions on Magnetics
    Issue number2
    Publication statusPublished - 1991
    MoE publication typeA1 Journal article-refereed


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