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RISS 인기검색어
- 검색키워드
- 저자 : Kwonjoon Lee (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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A Wrist Watch-type Cardiovascular Monitoring System using Concurrent ECG and APW Measurement
Kwonjoon Lee,Kiseok Song,Taehwan Roh,Hoi-jun Yoo 대한전자공학회 2016 Journal of semiconductor technology and science Vol.16 No.5
A wrist watch type wearable cardiovascular monitoring device is proposed for continuous and convenient monitoring of the patient’s cardiovascular system. For comprehensive monitoring of the patient’s cardiovascular system, the concurrent electrocardiogram (ECG) and arterial pulse wave (APW) sensor front-end are fabricated in 0.18 mm CMOS technology. The ECG sensor front-end achieves 84.6-dB CMRR and 2.3-mVrms-input referred noise with 30-mW power consumption. The APW sensor front-end achieves 3.2-V/W sensitivity with accurate bio-impedance measurement lesser than 1% error, consuming only 984-mW. The ECG and APW sensor front-end is combined with power management unit, micro controller unit (MCU), display and Bluetooth transceiver so that concurrently measured ECG and APW can be transmitted into smartphone, showing patient’s cardiovascular state in real time. In order to verify operation of the cardiovascular monitoring system, cardiovascular indicator is extracted from the healthy volunteer. As a result, 5.74 m/second-pulse wave velocity (PWV), 79.1 beats/minute-heart rate (HR) and positive slope of b-d peak-accelerated arterial pulse wave (AAPW) are achieved, showing the volunteer’s healthy cardiovascular state.
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A Wrist Watch-type Cardiovascular Monitoring System using Concurrent ECG and APW Measurement
Lee, Kwonjoon,Song, Kiseok,Roh, Taehwan,Yoo, Hoi-jun The Institute of Electronics and Information Engin 2016 Journal of semiconductor technology and science Vol.16 No.5
A wrist watch type wearable cardiovascular monitoring device is proposed for continuous and convenient monitoring of the patient's cardiovascular system. For comprehensive monitoring of the patient's cardiovascular system, the concurrent electrocardiogram (ECG) and arterial pulse wave (APW) sensor front-end are fabricated in $0.18{\mu}m$ CMOS technology. The ECG sensor frontend achieves 84.6-dB CMRR and $2.3-{\mu}Vrms$-input referred noise with $30-{\mu}W$ power consumption. The APW sensor front-end achieves $3.2-V/{\Omega}$ sensitivity with accurate bio-impedance measurement lesser than 1% error, consuming only $984-{\mu}W$. The ECG and APW sensor front-end is combined with power management unit, micro controller unit (MCU), display and Bluetooth transceiver so that concurrently measured ECG and APW can be transmitted into smartphone, showing patient's cardiovascular state in real time. In order to verify operation of the cardiovascular monitoring system, cardiovascular indicator is extracted from the healthy volunteer. As a result, 5.74 m/second-pulse wave velocity (PWV), 79.1 beats/minute-heart rate (HR) and positive slope of b-d peak-accelerated arterial pulse wave (AAPW) are achieved, showing the volunteer's healthy cardiovascular state.
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Sunjoo Hong,Kwonjoon Lee,Unsoo Ha,Hyunki Kim,Yongsu Lee,Youchang Kim,Hoi-Jun Yoo IEEE 2015 IEEE journal of solid-state circuits Vol.50 No.1
<P>A mobile electrical impedance tomography (EIT) IC is proposed for early breast cancer detection personally at home. To assemble the entire system into a simple brassiere shape, EIT IC is integrated via a multi-layered fabric circuit board which includes 90 EIT electrodes and two reference electrodes for current stimulation and voltage sensing. The IC supports three operating modes; gain scanning, contact impedance monitoring, and EIT modes for the clear EIT image. A differential sinusoidal current stimulator (DSCS) is proposed for injection of low-distortion programmable current which has harmonics less than -59 dBc at a load impedance of 2 kΩ. To get high sensitivity, a 6-channel voltage sensing amplifier can adaptively control the gain up to a maximum of 60 dB, and has low input referred noise, 36 nV/ √Hz. The 2.5 × 5 mm chip is fabricated in a 0.18 μm 1P6M CMOS process and consumes 53.4 mW on average. As a result, a sensitivity of 4.9 mΩ is achieved which enables the detection of a 5 mm cancer mass within an agar test phantom.</P>
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Kwantae Kim,Minseo Kim,Hyunwoo Cho,Kwonjoon Lee,Hoi-Jun Yoo 대한전자공학회 2017 Journal of semiconductor technology and science Vol.17 No.6
An ultra-low power bio-impedance sensor for wrist watch-type blood pressure monitoring system is implemented in 0.18 μm CMOS technology under 1.8 V supply. The duty-cycled current generator (DCG) enables low power and high amplitude current injection with 93.58% power reduction in a current generator block. A fast-settling readout circuit with DC balanced amplifier reduces settling time to 276 μs, allowing bio-impedance signal acquisition even when the motion artifact induced circuit transient occurs. The simulated 2.125 mm² single chip bio-impedance sensor consumes only 55.77 μW.
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