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 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 | |
| Publication status | Published - Jun 1 2005 |
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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 journal › Article
}
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.
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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 -