A 0.05mm2 1V Capacitance-to-Digital Converter Based on Period Modulation

📋 论文概要

本文提出了一种基于周期调制的电容数字转换器(CDC)，通过分段电荷转移等创新技术，实现了0.05mm²的超小面积和超过10倍的能量效率提升，解决了传统CDC面积大、能效低的问题。

💡 主要创新点

• 采用分段电荷转移技术，消除了对大型片上积分电容的需求，大幅缩小芯片面积。
• 引入双积分电容方案和采样偏置技术，降低了前端噪声和积分电流噪声，提高了信噪比。
• 使用电流高效的反相器设计，进一步提升了整体能效。

🏷 关键词

📄 原文摘要

capacitance-to-digital converter (CDC) that is >9× smaller than prior CDCs with >10b resolution [1-4], and improves the energy efficiency by >10× compared to previous PM-based CDCs [1]. This is achieved with the help of a piece-wise charge transfer technique that eliminates the need for a large on-chip integration capacitor, a dual-integration-capacitor scheme that reduces the front-end noise contribution, a sampled-biasing technique that reduces the noise of the integration current, and a current-efficient inverter-based design. The CDC is based on a relaxation oscillator whose output period is proportional to the sensor capacitance, C (Fig. 27.7.1) [1]. It employs an active integrator, on which charge proportional to C is balanced over time against charge provided by

👥 作者与机构

Yuming He, Zu-yao Chang, Lukasz Pakula,

Saleh Heidary Shalmany, Michiel Pertijs Delft University of Technology, Delft, The Netherlands This paper presents a digitally assisted period modulation (PM)-based