Compact readout electronics for 62-channel DROS magnetocardiogram system

Jin Mok Kim, Yong Ho Lee, Kiwoong Kim, Hyukchan Kwon, Yong Ki Park, Ichiro Sasada

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Compact and low-cost SQUID electronics to operate double relaxation oscillation SQUIDs (DROSs) has been constructed for detecting magnetocardiogram (MCG) fields. SQUID electronics consists of low-noise preamplifier with a white noise of 0.6 nV/√Hz, flux-locked loop (FLL) circuit with auto-reset, and interface circuit to control FLL using 3 digital lines from a computer. The automatic control software adjusts SQUID parameters to the optimum operating condition within 15 seconds for 62 channels. Outputs of FLL circuits are passed through the hardware filter box to the 64-channel data acquisition board. Each SQUID electronics for FLL and digital control is built together on a printed circuit board of 45 mm × 95 mm. When SQUID electronics is connected to DROS gradiometer with typical flux-to-voltage transfers of 1 mV/Φo, the noise contribution of FLL circuit is about 0.6 μ&Φo/√Hz or 0.6 fT/√Hz at 100 Hz, low enough to measure MCG fields.

Original languageEnglish
Pages (from-to)644-647
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume15
Issue number2 PART I
DOIs
Publication statusPublished - Jun 1 2005

Fingerprint

SQUIDs
readout
Electronic equipment
oscillations
Fluxes
electronics
Networks (circuits)
Printed circuit boards
gradiometers
automatic control
preamplifiers
printed circuits
circuit boards
white noise
low noise
White noise
data acquisition
boxes
hardware
Data acquisition

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

Compact readout electronics for 62-channel DROS magnetocardiogram system. / Kim, Jin Mok; Lee, Yong Ho; Kim, Kiwoong; Kwon, Hyukchan; Park, Yong Ki; Sasada, Ichiro.

In: IEEE Transactions on Applied Superconductivity, Vol. 15, No. 2 PART I, 01.06.2005, p. 644-647.

Research output: Contribution to journalArticle

Kim, Jin Mok ; Lee, Yong Ho ; Kim, Kiwoong ; Kwon, Hyukchan ; Park, Yong Ki ; Sasada, Ichiro. / Compact readout electronics for 62-channel DROS magnetocardiogram system. In: IEEE Transactions on Applied Superconductivity. 2005 ; Vol. 15, No. 2 PART I. pp. 644-647.
@article{418ad566cf4f4d579065ea91ed1b59da,
title = "Compact readout electronics for 62-channel DROS magnetocardiogram system",
abstract = "Compact and low-cost SQUID electronics to operate double relaxation oscillation SQUIDs (DROSs) has been constructed for detecting magnetocardiogram (MCG) fields. SQUID electronics consists of low-noise preamplifier with a white noise of 0.6 nV/√Hz, flux-locked loop (FLL) circuit with auto-reset, and interface circuit to control FLL using 3 digital lines from a computer. The automatic control software adjusts SQUID parameters to the optimum operating condition within 15 seconds for 62 channels. Outputs of FLL circuits are passed through the hardware filter box to the 64-channel data acquisition board. Each SQUID electronics for FLL and digital control is built together on a printed circuit board of 45 mm × 95 mm. When SQUID electronics is connected to DROS gradiometer with typical flux-to-voltage transfers of 1 mV/Φo, the noise contribution of FLL circuit is about 0.6 μ&Φo/√Hz or 0.6 fT/√Hz at 100 Hz, low enough to measure MCG fields.",
author = "Kim, {Jin Mok} and Lee, {Yong Ho} and Kiwoong Kim and Hyukchan Kwon and Park, {Yong Ki} and Ichiro Sasada",
year = "2005",
month = "6",
day = "1",
doi = "10.1109/TASC.2005.849982",
language = "English",
volume = "15",
pages = "644--647",
journal = "IEEE Transactions on Applied Superconductivity",
issn = "1051-8223",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "2 PART I",

}

TY - JOUR

T1 - Compact readout electronics for 62-channel DROS magnetocardiogram system

AU - Kim, Jin Mok

AU - Lee, Yong Ho

AU - Kim, Kiwoong

AU - Kwon, Hyukchan

AU - Park, Yong Ki

AU - Sasada, Ichiro

PY - 2005/6/1

Y1 - 2005/6/1

N2 - Compact and low-cost SQUID electronics to operate double relaxation oscillation SQUIDs (DROSs) has been constructed for detecting magnetocardiogram (MCG) fields. SQUID electronics consists of low-noise preamplifier with a white noise of 0.6 nV/√Hz, flux-locked loop (FLL) circuit with auto-reset, and interface circuit to control FLL using 3 digital lines from a computer. The automatic control software adjusts SQUID parameters to the optimum operating condition within 15 seconds for 62 channels. Outputs of FLL circuits are passed through the hardware filter box to the 64-channel data acquisition board. Each SQUID electronics for FLL and digital control is built together on a printed circuit board of 45 mm × 95 mm. When SQUID electronics is connected to DROS gradiometer with typical flux-to-voltage transfers of 1 mV/Φo, the noise contribution of FLL circuit is about 0.6 μ&Φo/√Hz or 0.6 fT/√Hz at 100 Hz, low enough to measure MCG fields.

AB - Compact and low-cost SQUID electronics to operate double relaxation oscillation SQUIDs (DROSs) has been constructed for detecting magnetocardiogram (MCG) fields. SQUID electronics consists of low-noise preamplifier with a white noise of 0.6 nV/√Hz, flux-locked loop (FLL) circuit with auto-reset, and interface circuit to control FLL using 3 digital lines from a computer. The automatic control software adjusts SQUID parameters to the optimum operating condition within 15 seconds for 62 channels. Outputs of FLL circuits are passed through the hardware filter box to the 64-channel data acquisition board. Each SQUID electronics for FLL and digital control is built together on a printed circuit board of 45 mm × 95 mm. When SQUID electronics is connected to DROS gradiometer with typical flux-to-voltage transfers of 1 mV/Φo, the noise contribution of FLL circuit is about 0.6 μ&Φo/√Hz or 0.6 fT/√Hz at 100 Hz, low enough to measure MCG fields.

UR - http://www.scopus.com/inward/record.url?scp=22044448069&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=22044448069&partnerID=8YFLogxK

U2 - 10.1109/TASC.2005.849982

DO - 10.1109/TASC.2005.849982

M3 - Article

AN - SCOPUS:22044448069

VL - 15

SP - 644

EP - 647

JO - IEEE Transactions on Applied Superconductivity

JF - IEEE Transactions on Applied Superconductivity

SN - 1051-8223

IS - 2 PART I

ER -