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

Juho Luomahaara; Mikko Kiviranta; Juha Hassel

doi:10.1088/0953-2048/25/3/035006

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

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

VTT Technical Research Centre of Finland

Research output: Contribution to journal › Article › Scientific › peer-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 language	English
Article number	035006
Number of pages	4
Journal	Superconductor Science and Technology
Volume	25
Issue number	3
DOIs	https://doi.org/10.1088/0953-2048/25/3/035006
Publication status	Published - 2012
MoE publication type	A1 Journal article-refereed

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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.",

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AB - 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.

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DO - 10.1088/0953-2048/25/3/035006

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JO - Superconductor Science and Technology

JF - Superconductor Science and Technology

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

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