A 25MHz-BW 77.2dB-SNDR 2nd-Order Gain-Error-Shaping and NS Pipelined SAR ADC Based on a Quantization-PredictionUnrolled Scheme

📋 论文概要

该论文提出了一种基于量化预测展开的2阶增益误差整形与噪声整形流水线SAR ADC，通过预测第一级量化噪声并利用第二级输出进行误差整形，有效抑制了级间增益误差，实现了25MHz带宽和77.2dB SNDR的高性能。

💡 主要创新点

• 提出量化预测展开技术，通过预测第一级量化噪声来减少增益误差整形中的截断误差。
• 实现2阶增益误差整形与噪声整形结合，显著提升ADC的带内信噪比和线性度。

🏷 关键词

📄 原文摘要

Instituto Superior Tecnico/University of Lisboa, Lisbon, Portugal 1 2 Shaping the interstage gain error in two-step oversampling ADCs has demonstrated a decent error suppression with a variety of mechanisms. The interstage gain error shaping (GES) technique in [1-2] reduces the quantization noise from the 1st stage (Q1) before amplification by subtracting the predicted Q1 based on the 2nd-stage output. Equivalently, the gain error (∆) undergoes a high-pass filtering (1-HGES) and thereby shapes to high frequencies. Nevertheless, such a solution induces truncation error (Qtr) which needs to be suppressed by the cascaded digital error feedback (DEF) at the 2nd-stage output [2]. It also introduces an additional pole (1-∆HGES) in the overall ADC in/out transfer function. The former issue complicates the design with multi-bit loop operation and confines the speed, while the latter leads to positive feedback with +∆ and thereby significantly

👥 作者与机构

Hongshuai Zhang1, Yan Zhu1, Chi-Hang Chan1, R. P. Martins1,2

University of Macau, Macau, China