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- Title
Small-area low-power heart condition monitoring system using dual-mode SAR-ADC for low-cost wearable healthcare systems.
- Authors
Young-San Shin; Jae-Kyung Wee; Inchae Song; Seongsoo Lee; Shin, Young-San; Wee, Jae-Kyung; Song, Inchae; Lee, Seongsoo
- Abstract
<bold>Background: </bold>Heart rate monitoring is useful to detect many cardiovascular diseases. It can be implemented in a small device with low power consumption, and it can exploit low-cost piezoelectric pressure sensors to measure heart rate. However, it is also desirable to transmit heartbeat waveform for emergency treatment, which significantly increases transmission power.<bold>Objective: </bold>In this paper, a low-cost wireless heart condition monitoring SoC is proposed. It can monitor and transmit both heart rate and heartbeat waveform, but the hardware is extremely simplified to achieve in a small package.<bold>Methods: </bold>By slight modification of successive-approximation analog-digital converter, it can count heart rate and read out heartbeat waveform with the same hardware. In the normal mode, only an 8-bit heart rate is transmitted for power reduction. If the heart rate is out of a given range, it goes to the emergency mode and a 10-bit heartbeat waveform is transmitted for fast treatment.<bold>Results: </bold>The fabricated chip size is 1.1 mm2 in 0.11 μ m CMOS technology, including the radio-frequency transmitter. The measured power consumption is 161.8 μ W in normal mode and 507.3 μ W in emergency mode, respectively.<bold>Conclusion: </bold>The proposed SoC achieves low-cost, small area, and low-power. It is useful as part of a disposable healthcare system.
- Subjects
HEART rate monitoring; CARDIOVASCULAR disease diagnosis; PIEZOELECTRIC detectors; EMERGENCY medicine; ANALOG-to-digital converters; MEDICAL care
- Publication
Technology & Health Care, 2015, Vol 23, pS277
- ISSN
0928-7329
- Publication type
journal article
- DOI
10.3233/THC-150963