A 75#x03BC;W real-time scalable network controller and a 25#x03BC;W ExG sensor IC for compact sleep-monitoring applications

摘要

Recently, a wearable body-sensor network realized continuous sleep monitoring by ExG (EEG, EMG, EOG, and ECG) extraction from a sleeper's face [1]. At least 14 sensors were placed on the face, and were managed by a network controller for sleep monitoring. However, the system in [2] was too bulky and heavy (127×63.5×28mm3, 210g) to wear during sleep, and consumed high power (>100mW). Another system used a CMOS IC sensor for smaller power consumption (5 to 10mW/sensor), but it was still inconvenient to wear due to its cumbersome size (49×19×6mm3) [3]. This paper presents a 5g sub-500VW compact sleep-monitoring system based on a low-power network controller and ExG sensors, and Planar Fashionable Circuit Board (P-FCB) technology [4]. The entire sleep monitor operates on a 1.5V 10mAh single tiny coin battery (Φ=5.8mm, T=2.1mm, 200mg) stacked on the controller chip. The power dissipation of 14 sensors and a controller is below 425μW, which is <1.5% of previous works [2–3]. Its low power consumption is possible by the Linked-List Manager (LLM)-based protocol such as Adaptive Dual-Mode Control (ADMC) and Continuous Data Transmission (CDT), and low-swing clock and data transceivers.