Key result
The proposed analog front end implemented in CMOS 180nm technology consumes 1.3uA at 1V, achieving a noise efficiency factor of 2.67 and an effective number of bits of 10.1.
Why the study?
Continuous tracking of ECG signals to assist in treating cardiovascular disease requires a miniaturized and power-efficient design for long-time continuous monitoring.
The designed ultra-low-power analog front end provides efficient bio-potential acquisition for continuous wearable ECG monitoring.
May support continuous wearable ECG monitoring; leaves open prospective clinical validation.
Continuous tracking of heart activity from an Electrocardiogram (ECG) signal to assist physicians in treating Cardio Vascular Disease (CVD) requires a miniaturized and power-efficient design for long-time continuous monitoring. The work presents an ultra-low-power bio-potential acquisition and 11b successive approximation register (SAR) analog to digital converter (ADC) to acquire clean ECG signal and digitized data for further on-sensor processing, respectively. The designed low-noise amplifier (LNA) targets a wearable environment utilizing an AC coupled chopper technique to reject rail-to-rail electrode DC offset (EDO), 50/60 Hz interference, and mitigate flicker noise. The proposed analog front end (AFE) is implemented utilizing a CMOS 180nm technology and consumes 1.3uA of current while operating @ 1V. The system achieves NEF and input-referred noise of 2.67 and 50nV/√Hz, respectively, with an effective number of bits (ENOB) of 10.1.
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Shah et al. (2021) studied Cardio Vascular Disease (CVD). Ultra-low-power bio-potential acquisition and 11b SAR ADC was evaluated on System performance (NEF, input-referred noise, ENOB). The proposed analog front end implemented in CMOS 180nm technology consumes 1.3uA at 1V, achieving a noise efficiency factor of 2.67 and an effective number of bits of 10.1.
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