An ECG pre-amplifier with $2.89\ \mu\mathrm{W}$ and 86.73dB CMRR

Abstract

Wearable electrocardiogram (ECG) sensors technology has great significance today since it can continuously monitor people's health conditions. In this work, we set out to design a high-quality amplifier circuit that can be used for wearable ECG sensors technology. This amplifier was constructed by a three-stage circuit, which included a human body model, input, and amplifier circuit, and connect the circuit. The proposed circuit used two operational transconductance amplifiers, which can lower power supply and power consumption. LTspice environment was utilized to simulate the circuit and analyze the result. The simulation presented that the common mode rejection ratio of this work was about 86.73dB. The input-referred noise was about $6.4 \mu\text{Vrms}$, and the noise was about $2.89 \mu\mathrm{W}$ for each operational transconductance amplifier. The result demonstrated that the amplifier was of good quality, having the potential to be adopted into wearable ECG sensors technology for its capability to extract and amplify clean electrocardiogram signals.