Compact readout electronics for 62-channel DROS magnetocardiogram system

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

doi:10.1109/TASC.2005.849982

Compact readout electronics for 62-channel DROS magnetocardiogram system

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

Electrical Engineering Sciences

Research output: Contribution to journal › Article › peer-review

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/Φ_o, the noise contribution of FLL circuit is about 0.6 μ&Φ_o/√Hz or 0.6 fT/√Hz at 100 Hz, low enough to measure MCG fields.

Original language	English
Pages (from-to)	644-647
Number of pages	4
Journal	IEEE Transactions on Applied Superconductivity
Volume	15
Issue number	2 PART I
DOIs	https://doi.org/10.1109/TASC.2005.849982
Publication status	Published - Jun 1 2005

All Science Journal Classification (ASJC) codes

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

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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",

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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.

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