Live Demonstration: A Low-Power BLE ECG Wearable System

Wearable electrocardiogram (ECG) systems have shown significance in daily health monitoring. Traditional ECG systems are characterized by bulky and stationary equipment as well as high power consumption, which restricts the applications in long-term wearable applications [1]. In this work, we demonstrate a wearable BLE ECG monitoring system on human body, which is based on the design of a low-power highly-integrated physiological signal-acquisition chip. The chip is fabricated in 65 nm CMOS process, incorporating an 8 -channel analog front end (AFE), a 10-bit successive approximation register analog-to-digital converter (SAR-ADC). In addition, the power management is also integrated on the chip, which enables the entire system to dissipate low power from a single battery. Measured results show that the physiological signal-acquisition chip consumes $249 \mu \mathrm{~W}$ in all, which features: 1) The AFE realizes a gain of 43.3 dB, an input referred noise (IRN) of $9.68 \mu \mathrm{Vrms}$, a bandwidth of $0.9 \mathrm{~Hz}-7.2 \mathrm{kHz}$, and a common-mode rejection ratio (CMRR) of 82.75dB. 2) The SAR ADC shows an effective number of $\mathbf{9. 6 6}$ bits with 315nW power. 3) The wearable wireless ECG system takes 18 mW power and 16.8 g weight. Demonstrated on a human body, the system can send the ECG signals to a smartphone through BLE.