A Resolution-Reconfigurable 5-to-10b 0.4-to-1V Power Scalable SAR ADC

📋 论文概要

该论文提出了一种分辨率可重构的逐次逼近型模数转换器（SAR ADC），其功耗随分辨率和采样率动态缩放，适用于传感器网络和医疗监测等能量受限系统。通过自适应调整ADC性能以匹配信号需求，避免了不必要的功耗浪费，同时降低了系统复杂度和成本。

💡 主要创新点

• 提出分辨率可重构的SAR ADC架构，支持5至10位分辨率动态调整，适应不同带宽和动态范围需求。
• 实现功耗随分辨率和采样率线性缩放，在0.4V至1V电源电压下保持高能效，显著提升能量效率。

🏷 关键词

📄 原文摘要

Applications such as sensor networks and medical monitoring often require ADCs that can digitize signals with varying bandwidth and dynamic range requirements. In energy-constrained systems, it is beneficial to adapt the ADC performance to the signal to avoid consuming power on unnecessary bandwidth or accuracy. Therefore, this paper presents a single reconfigurable SAR ADC whose power scales with resolution and sample rate to improve energy efficiency, while reducing system complexity and cost. Recent SAR ADCs have achieved ultra-low FOMs but most lack the ability to reconfigure their resolution [1, 2]. With fixed-resolution ADCs, a straightforward way to decrease resolution is to truncate bits, but this leads to a 2× degradation in energy efficiency (or alternatively, the FOM, calculated as P/(2ENOB·2fin)) with each dropped bit. In [3], a 3-to-8b SAR ADC is presented, but it is not optimized for scalability over frequency. The ADC presented in this paper has 6 resolution modes from 5

👥 作者与机构

Marcus Yip, Anantha P. Chandrakasan

Massachusetts Institute of Technology, Cambridge, MA