Key result
Three-step incremental ADC achieves ~108-dB dynamic range, enabling motion-tolerant wearable ECG and EEG recordings.
Why the study?
Wearable biopotential signal recording requires tolerating DC and low-frequency disturbances such as electrode offset, 50/60 Hz interference, and motion artifact with power-efficient, high dynamic range analog-to-digital conversion.
The proposed three-step incremental ADC achieves high dynamic range and power efficiency, enabling tolerance of significant DC and low-frequency disturbances in wearable ECG and EEG recordings.
Offers a hardware foundation for more reliable wearable ECG monitoring during motion; leaves open clinical.
This article describes a power-efficient, high dynamic range (DR) incremental ADC (IADC) for wearable biopotential signals recording, where DC and low-frequency disturbances such as electrode offset, 50/60 Hz interference and motion artifact must be tolerated. To achieve a wide DR, the IADC performs a three-step conversion by combining zoom-SAR and extended counting (EC) on top of a second-order incremental delta-sigma modulator (ΔΣM). The hybrid architecture notably reduces the oversampling ratio (OSR) with respect to conventional incremental ΔΣMs, while using the EC further improves the Signal-to-Noise-and-Distortion Ratio (SNDR) by 7.4 to 25.6 dB. Fabricated in a 0.18-μm CMOS technology, the IADC achieves 107.6-dB DR, 104.9-dB peak SNR, and 99.3-dB peak SNDR at 2 kS/s while dissipating 130 μW from 1.8-V (analog) / 1.2-V (digital) supply. This translates to a highly competitive FoMDRof 176.5 dB. The high-DR IADC reduces the gain of the preceding instrumentation amplifier (IA) such that significant DC and low-frequency disturbances can be tolerated. The advantages of high DR have been demonstrated by wearable Electrocardiography (ECG) and Electroencephalography (EEG) recordings under motion artifact.
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Fang et al. (2023) studied wearable biopotential signals recording. three-step incremental ADC (IADC) vs. conventional incremental ΔΣMs was evaluated on Dynamic Range (DR), SNR, SNDR. A three-step incremental ADC achieved a 107.6-dB dynamic range and 99.3-dB peak SNDR at 2 kS/s while dissipating 130 μW, enabling motion-tolerant wearable ECG and EEG recordings.
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