-ENOB 184.9dB-FoM Capacitor-Array-Assisted Cascaded Charge-Injection SAR ADC

📋 论文概要

本文提出一种电容阵列辅助级联电荷注入SAR ADC (c-ciSAR)，解决IoT传感器对低功耗高精度ADC的需求，实现了17b标称分辨率和14.14位ENOB，同时达到184.9dB的FoM。

💡 主要创新点

• 采用电容阵列辅助级联电荷注入结构，在不显著增加功耗的前提下同时处理分辨率、失配和噪声限制。
• 通过级联电荷注入技术提升分辨率，实现高精度采样且保持高能效。

🏷 关键词

📄 原文摘要

IoT sensors are in rising demand and they often require low power, yet high precision measurements. Under constrained energy, Nyquist-rate SAR ADCs are typically used for readout as they are energy efficient and easy to multiplex across many sensors. However, achieving high precision (>14b) in SAR ADCs is challenging as all factors limiting performance (resolution, mismatch, and noise) must be simultaneously addressed with minimal energy impact. In this paper, we present an energy-efficient, capacitor-array-assisted cascaded charge-injection SAR ADC (c-ciSAR) with 17b nominal resolution (14.14b ENOB) that achieves a 184.9dB Schreier FoM (SFoM) and 4.32fJ/conv with a 1V supply in 0.18µm CMOS. The ADC deploys a combination of techniques to improve resolution, mismatch, and noise performance while remaining energy-efficient, namely: 1) hybridization of a capacitor-array DAC (CDAC) with chargeinjection-cell (ci-cell) based DACs (ciDACs) to achieve high resolution and flexible

👥 作者与机构

Kyojin Choo, Hyochan An, Dennis Sylvester, David Blaauw

University of Michigan, Ann Arbor, MI