A large winding-ratio planar transformer with an optimized geometry for SQUID ammeter

Juho Luomahaara (Corresponding Author), Mikko Kiviranta, Juha Hassel

    Research output: Contribution to journalArticleScientificpeer-review

    8 Citations (Scopus)

    Abstract

    We present a new multiturn gradiometric transformer design. The transformer has a winding ratio of 1284:2 and is composed of a coplanar primary and secondary to overcome the problem of parasitic resonances typically related to planar input circuits with large winding ratios. When applied with a superconducting quantum interference device (SQUID), a highly sensitive current detector down to 25 fA Hz−1/2 is demonstrated. The device characterization yields a coupling coefficient of 0.39 for the transformer.
    Original languageEnglish
    Article number035006
    Number of pages4
    JournalSuperconductor Science and Technology
    Volume25
    Issue number3
    DOIs
    Publication statusPublished - 2012
    MoE publication typeA1 Journal article-refereed

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