소형화 및 저전력소모를 구현한 실시간 생체신호 측정기 개발
A compact and low-power consumable device forcontinuous monitoring of biosignal
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Abstract
A compact biosignal monitoring device was developed. Electrodes for electrocardiogram (ECG) and a LED and silicondetector for photoplethysmogram (PPG) were used. A lead II type was arranged for ECG measurement and reflected lightmeasurement protocol and processed measured signals. PPG and ECG had a sampling rate of 300 Hz with 8-bit resolution.The maximum power consumption was 100 mW. The microprocesor computed pulse transit time (PTT) between the R-wave of ECG and the peak of PPG. To increase the resolution of PT, analog peak detectors obtained the peaks of ECGand PPG whose interval was calculated using an internal clock cycle of 921.6 kHz. The device was designed to be operatedby 3-volt battery. Biosignals can be measured for 2~3 days continuously without the external interuptions and data isstored to an on-board memory. Our system was succesfuly tested with human subjects.
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