A 28µW 134dB DR 2nd-Order Noise-Shaping Slope Light-to-Digital Converter for Chest PPG Monitoring 200µA. Since the DC-compensation information is available in the digital domain, the full-range signal can easily be reconstructed to derive the PI and blood oxygenation levels.

📋 论文概要

本文提出了一种用于胸戴PPG监测的28µW 134dB动态范围二阶噪声整形斜率光数字转换器，通过低功耗设计解决了高动态范围与低功耗之间的权衡问题。

💡 主要创新点

• 采用二阶噪声整形斜率架构，在低功耗下实现高动态范围。
• 通过小尺寸PMOS开关和虚拟管减少电荷注入和泄漏电流，保证量化误差精度。

🏷 关键词

📄 原文摘要

Dwaipayan Biswas1, Chris Van Hoof1,2, Filip Tavernier2, Nick Van Helleputte1 Figure 28.3.3 (right) shows the circuit implementation of the capacitor bank and the 3-T comparator within the NS loop. Since the input is a 10b quantization error updated at only 2048Hz, the requirements of the 2nd integrator are relaxed (low speed, low output swing). However, the quantization error can be disturbed by the charge injection during the sampling or comparison. A small-size PMOS switch with dummies is used to reduce the charge injection and minimize the leakage current. The latter ensures the quantization error can be stored on the capacitor for at least 2 samples. The 3-T dynamic comparator uses a neutralization method by adding cross-coupled dummy input pairs to decrease the kickback effect. A gain of 2 is achieved by doubling the input transistor size at the VRES_O terminal. imec, Leuven, Belgium

👥 作者与机构

Qiuyang Lin1,2, Shuang Song1, Roland Van Wegberg3, Mario Konijnenburg3,