A Low Power Low Noise ECG Amplifier Design based on OTA

Abstract

The paper introduced a new electrocardiogram (ECG) signal recording system that puts power consumption performance as the most important factor. Most of the research in this field focuses on accuracy, leaving a blank on applications with limited power supply. To minimize the power consumption, we employed a full-analog circuit with application of 180nm CMOS and a classic 3-OTA-Amplifier design, which guarantees that the power consumption could reach only one tenth of other designs, for example, design with a combination of both digital and analog circuit that consumes more energy. The gain of this design reaches a reasonable 40dB in its full bandwidth, and the noise performance of this design is well controlled to $2.96\mu \text{Vrms}$, which would be accurate enough for analysis and processing procedures in the system, achieving a balance between accuracy and power consumption. This design would have significant potential on applications sensitive to power consumption while accuracy is less important, for example, wearable devices.