ECG monitoring circuit

A miniature ECG monitoring circuit was developed for the demonstration of the application in this work. This device is composed of data acquisition, amplification, processing and communication via Bluetooth and is connected to the patch through 4 connections, two as ECG signal inputs and another two as power input (respectively “ECG−”/“ECG+” and “Receiver coil” (Fig. 2A). The two main components of this device are a Bluetooth modulus (CYBLE-014008-00) and ultra-low power, single-channel integrated biopotential chip (MAX30003) (Fig. 2B). For the case of heartbeat acquisition and communication via Bluetooth, the power consumption of the ECG circuit is ~1.6 mW (3.3 V, 500 µA).

Main components of the ECG acquisition and transmission board: (A) scheme of the circuit; (B) (i) picture of the box of ECG acquisition system and (ii) of the PCB board; (C) WPT resonant circuit used⁵⁵.