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

7 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

Fingerprint

ammeters
Ammeters
SQUIDs
transformers
interference
Geometry
geometry
coupling coefficients
Detectors
Networks (circuits)
detectors

Cite this

@article{1ee6b5215c4c470a8670bbbc714c6ae8,
title = "A large winding-ratio planar transformer with an optimized geometry for SQUID ammeter",
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.",
author = "Juho Luomahaara and Mikko Kiviranta and Juha Hassel",
year = "2012",
doi = "10.1088/0953-2048/25/3/035006",
language = "English",
volume = "25",
journal = "Superconductor Science and Technology",
issn = "0953-2048",
publisher = "Institute of Physics IOP",
number = "3",

}

A large winding-ratio planar transformer with an optimized geometry for SQUID ammeter. / Luomahaara, Juho (Corresponding Author); Kiviranta, Mikko; Hassel, Juha.

In: Superconductor Science and Technology, Vol. 25, No. 3, 035006, 2012.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - A large winding-ratio planar transformer with an optimized geometry for SQUID ammeter

AU - Luomahaara, Juho

AU - Kiviranta, Mikko

AU - Hassel, Juha

PY - 2012

Y1 - 2012

N2 - 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.

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.

U2 - 10.1088/0953-2048/25/3/035006

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

M3 - Article

VL - 25

JO - Superconductor Science and Technology

JF - Superconductor Science and Technology

SN - 0953-2048

IS - 3

M1 - 035006

ER -