A 1.5µW 0.135pJ∙%RH2 CMOS Humidity Sensor Using Adaptive Range-Shift Zoom CDC and Power-Aware Floating Inverter Amplifier Array

📋 论文概要

本文提出了一种基于自适应范围移位缩放CDC和功率感知浮空反相放大器的CMOS湿度传感器，实现了1.5µW的超低功耗和0.135pJ∙%RH2的高能效，解决了传统湿度传感器功耗高、精度受限的问题。

💡 主要创新点

• 采用自适应范围移位缩放CDC技术，通过动态调整SAR代码使DSM比特流密度保持在50%±6.25%范围内，有效扩展了输入范围并提高了精度。
• 提出功率感知浮空反相放大器，在低功耗下实现高增益和低噪声，进一步优化了传感器能效。

🏷 关键词

📄 原文摘要

China in the DSM is ~200fF, and an LSB of the SAR DAC is ~50fF. Hence, the differential input range of the DSM can be calculated as 2%200fF/50fF = 8LSBs of the SAR, and 0.5LSB error is equal to 6.25% of the range. When ARS is activated, the density of the DSM bitstream (bs) is analyzed and the SAR code will be moved accordingly to ensure the bs density within 50%±6.25%. For example, if the bs density is detected to be smaller than 43.75%, a SAR compensation code is added by 1; and if the bs density is larger than 56.25%, the code is subtracted by 1. By sensing the bs density and correcting the SAR code, the DSM input can be kept in the optimal range. 1 2 Capacitive sensors are widely deployed in low-power IoT nodes, where power

👥 作者与机构

Heyi Li1, Zhichao Tan2, Yuanxin Bao3, Han Xiao3, Hao Zhang1, Kaixuan Du1,

Yihan Zhang1, Le Ye1,3, Ru Huang1 Peking University, Beijing, China Zhejiang University, Hangzhou, China 3 Advanced Institute of Information Technology of Peking University, Hangzhou,