A 13-ENOB 2nd-Order Noise-Shaping SAR ADC Realizing Optimized NTF Zeros Using an Error-Feedback Structure

📋 论文概要

该论文提出了一种基于误差反馈结构的二阶噪声整形SAR ADC，通过优化噪声传递函数零点实现了13-ENOB的高分辨率，解决了传统CIFF结构功耗高和缩放友好性差的问题。

💡 主要创新点

• 采用误差反馈结构替代传统的CIFF结构，避免了有源积分器，降低了功耗并提高了工艺缩放友好性。
• 通过优化噪声传递函数零点，实现了二阶噪声整形，提升了带内噪声抑制能力。

🏷 关键词

📄 原文摘要

The noise-shaping (NS) SAR ADC is an emerging hybrid architecture that achieves high resolution and power-efficiency simultaneously by combining the merits of the SAR ADC and the ΔΣADC, making it attractive to sensor readout and healthcare applications. To implement NS, most prior works adopted the classic cascaded integrator feed-forward (CIFF) structure for noise filtering [1-5]. Opamp-based integrators were used in [1-3] to achieve a relatively sharp noise transfer function (NTF), but at the cost of power and scaling friendliness. Reference [4] demonstrated 2nd-order NS using fully passive switched-capacitor (SC) integrators, but has limited NS and thermal noise performance. Reference [5] combines passive SC filters with a dynamic amplifier (D-amp) to achieve good noise and power, but is vulnerable to process-voltage-temperature (PVT) variations. In addition, no prior NS SAR has realized complex NTF zeros for optimum NS. This presents a need for

👥 作者与机构

Shaolan Li, Bo Qiao, Miguel Gandara, Nan Sun

University of Texas, Austin, TX