A 400mVpp 92.3dB-SNDR 1kHz-BW 2nd-Order VCO-Based ExG-to-Digital Front-End Using a Multiphase Gated-Inverted Ring-Oscillator Quantizer

📋 论文概要

该论文提出了一种基于VCO的ExG生物电位数字前端，采用多相门控反相环形振荡器实现二阶调制，能够在400mVpp输入范围内达到92.3dB SNDR和1kHz带宽，同时功耗低于10µW，解决了可穿戴设备中低功耗、高精度和高输入阻抗的挑战。

💡 主要创新点

• 采用多相门控反相环形振荡器实现二阶VCO调制，提高了线性度和动态范围。
• 在极低功耗（<10µW）下实现92.3dB SNDR和1kHz带宽，适合临床级ExG监测。
• 通过高输入阻抗设计（>10MΩ）避免信号衰减，兼容运动伪影和刺激伪影抑制。

🏷 关键词

📄 原文摘要

Next-generation wearable devices will enable clinical-grade, continuous ExG (ECG, EEG, EMG, etc.) biopotential monitoring, providing medical professionals with valuable longitudinal data outside of hospital settings. These devices must be ultra-low power (<10µW) to enable long battery life while accurately digitizing sub-kHz, µV-level ExG signals in the presence of large motion and/or stimulation artifacts (>100mV) with high input-impedance (Zin>10M)) to avoid signal attenuation. Achieving such performance with conventional PGA+ADC architectures is challenging due to the conflicting low-power and >90dB dynamic-range (DR) requirements [1]. To address this, several direct digitization analog front-ends (AFEs) have been reported [2-4]. While these offer wide DR, they typically have low input-impedance (<5M)) and/or low power-efficiency (FoM*172dB). This paper presents a scalable 2nd-order voltage-controlled oscillator

👥 作者与机构

Corentin Pochet, Jiannan Huang, Patrick P. Mercier, Drew A. Hall

University of California, San Diego, CA