A 70dB SNDR 80MHz BW Filter-Embedded Pipeline-SAR ADC Achieving 172dB FoMS with Progressive Conversion and Floating-Charge-Transfer Amplifier

📋 论文概要

本文提出了一种嵌入无源FIR/IIR滤波器的流水线逐次逼近型模数转换器（Pipeline-SAR ADC），旨在替代连续时间ΔΣ调制器（CTDSM）以解决其带宽增大时功耗飙升的问题。该设计通过渐进式转换和浮动电荷技术实现了70dB SNDR、80MHz带宽和172dB FoMS的高性能。

💡 主要创新点

• 采用无源FIR/IIR滤波器嵌入SAR ADC结构，在保持固有抗混叠能力的同时避免了CTDSM的带宽-功耗折衷。
• 引入渐进式转换和浮动电荷技术（Floating-Char），优化了信号建立与噪声性能，实现了高SNDR与高FoM。

🏷 关键词

📄 原文摘要

before the ADC often occupies a significant area and noise contribution, especially when a Nyquist-sampling ADC is used and a sharp anti-aliasing BBF is thereby necessary (Fig. 18.7.1a). The continuous-time ∆Σ modulator (CTDSM) relaxes the BBF by its intrinsic anti-aliasing (Fig. 18.7.1b). However, it hits a “bandwidth wall” where its power consumption soars with bandwidth increment due to its closed-loop nature [1-3], impeding its applications in the next-gen wireless. The filter-embedded SAR ADC [4-5] is a promising alternative to the CTDSM. By incorporating a passive FIR/IIR filter into the CDAC, these SAR ADCs acquire anti-aliasing features with high efficiency and considerable area savings (Fig. 18.7.1c). Nevertheless, the filtering operation and SAR conversion intrinsically limit their sampling

👥 作者与机构

Siyu Huang, Zhishuai Zhang, Xiyu He, Mingyang Gu, Yunsong Tao, Yi Zhong,

Nan Sun, Lu Jie Tsinghua University, Beijing, China In the analog front-end (AFE) of radio receivers, the base-band filter (BBF)