A 16fJ/Conversion-Step Time-Domain Two-Step Capacitance-to-Digital Converter

📋 论文概要

该论文提出了一种基于时域两步转换的电容数字转换器（CDC），实现了16fJ/转换步的能效，解决了传统SAR CDC在高分辨率下功耗效率下降以及ΔΣ CDC复杂度高的问题。

💡 主要创新点

• 采用时域两步转换架构，将电容变化转换为时间差，避免了对低噪声比较器或OTA的需求，从而降低功耗。
• 通过两步量化实现高分辨率与低功耗的折中，达到16fJ/转换步的极优能效。

🏷 关键词

📄 原文摘要

Boston, MA 1 2 Capacitive sensors are widely used to measure various physical quantities, including pressure, humidity [1], and displacement [2]. Ultra-low-power capacitance-to-digital converters (CDCs) are required for sensors with limited battery capacity or powered by energy harvesters. A SAR CDC is simple to design and well-suited for low-to-medium resolution applications. However, to reach high resolution, it requires a low-noise comparator [3] or OTA-based active charge transfer [4], resulting in degraded power efficiency. The ΔΣ CDC [1] is suitable for high-resolution applications, but it requires OTAs and repeated charging of the sensing capacitor, leading to high power consumption. The Zoom CDC in [5]

👥 作者与机构

Xiyuan Tang1, Shaolan Li1, Linxiao Shen1, Wenda Zhao1, Xiangxing Yang1,

Randy Williams1, Jiaxin Liu2, Zhichao Tan3, Neal Hall1, Nan Sun1 University of Texas, Austin, TX University of Electronic Science and Technology of China, Chengdu, China 3 Analog Devices,