A wearable cardiovascular monitoring system using concurrent ECG & APW measurement

Abstract

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 ECG and APW sensor front-end are fabricated in 0.18um CMOS technology. The ECG sensor front-end achieves 84.6 dB CMRR and 2.3uV/√Hz input referred noise with 30uW power consumption. The APW sensor front-end achieves 3.2V/W sensitivity with accurate bio-impedance measurement lesser than 1% error, consuming only 984uW.Abovementioned ECG and APW sensor front-end is combined with power managementunit, MCU, display and Bluetooth transceiver so that concurrently measured ECG andAPW can be transmitted into smartphone, providing patients with their cardiovascular state in real time.In order to verify operation of the cardiovascular monitoring system, cardiovascularindicator is extracted from the healthy volunteer. As a result, PWV (5.74m/second), HR(79.1 beats/minute) and AAPW (positive slope of b-d peak) are achieved, showing the volunteer’s healthy cardiovascular state.