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http://dx.doi.org/10.5573/ieek.2013.50.6.091

On-chip Magnetic Sensor with Embedded High Inductance Coil for Bio-magnetic Signal Measurement  

Lyu, HyunJune (Department of Electronics Engineering, Graduate School, Kyungpook National University)
Choi, Jun Rim (Department of Electronics Engineering, Graduate School, Kyungpook National University)
Publication Information
Journal of the Institute of Electronics and Information Engineers / v.50, no.6, 2013 , pp. 91-98 More about this Journal
Abstract
Magnetic sensor chip for measuring bio-magnetism is implemented in $0.18{\mu}m$ CMOS technology. The magnetic sensor chip consists of a small-sized high inductance coil sensor and an instrumentation amplifier (IA). High inductance coil sensor with suitable sensitivity and bandwidth for measurement of bio-magnetic signal is designed using electromagnetic field simulation. Low gm operational transconductance amplifier (OTA) using transconductance reduction techniques is designed for on-chip solution. Output signal sensitivity of magnetic sensor chip is $3.25fT/{\mu}V$ and reference noise of 21.1fT/${\surd}$Hz. Proposed IA is designed along with band pass filters(BPF) to reduce magnetic signal noise by using current feedback techniques. Proposed IA achieves a common mode rejection ratio of 117.5dB while the input noise referred is kept below $0.87{\mu}V$.
Keywords
Integrated sensor;
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Times Cited By KSCI : 1  (Citation Analysis)
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