An 18.5nF-Input-Range PM-SAR-Hybrid Capacitance-to-Digital Converter Achieving 6.1µs Conversion Time at 18.1pF Input Capacitance

📋 论文概要

本文提出了一种PM-SAR混合型电容数字转换器，通过时间差消除技术实现18.5nF的输入范围，在18.1pF输入电容下达到6.1µs的转换时间。解决了大输入范围和高精度电容检测的权衡问题。

💡 主要创新点

• 采用PM-SAR混合架构，结合相位调制和逐次逼近寄存器实现宽输入范围电容检测。
• 通过双振荡器（S-OSC和R-OSC）产生时间差，并利用数字比较器和边沿检测器放大周期信息，消除初始时间差，仅保留电容变化信息。

🏷 关键词

📄 原文摘要

S-OSC and R-OSC (S-DIV and R-DIV) derive a time difference ∆TSU+N·∆T, which is then converted to ∆VSU+∆V and D2[k] in the same manner. Finally, the kth C2D conversion result DLSB[k] is obtained as D1[k]%D2[k], so it contains only the desirable ∆C information by canceling out the time difference at the initial phase. Overall, PD AMP detects the initial time difference of S-OSC and R-OSC with a digital comparator and an edge detector and amplifies the period information with frequency dividers (Fig. 28.1.3(top)). By subtracting the two T2D conversion results, DLSB[k] not only represents the desirable ∆C information but also is independent of 1) CP leakages during the PD AMP operation and 2) any DC voltage errors like comparator offsets.

👥 作者与机构

Donghyun Youn1, Kyeongwon Jeong2, Woongro Youn1, Hoyong Seong1,

Yechan Park1, Sohmyung Ha3, Minkyu Je1 KAIST, Daejeon, Korea ETH Zürich, Zürich, Switzerland 3 New York University Abu Dhabi, Abu Dhabi, United Arab Emirates 1 outputs of