A 98.5dB-SNDR 250kHz-BW 1V-Supply Continuous-Time Zoom ADC with Smart-Tracking and Floating-Tail-Resistor Linearized Gm-C Loop Filter

📋 论文概要

本文提出了一种98.5dB SNDR、250kHz带宽的连续时间增量Zoom ADC，采用智能跟踪技术扩展输入跟踪带宽至奈奎斯特频率，并利用浮尾电阻线性化Gm-C积分器实现高线性度和高效率。该设计在28nm CMOS工艺下实现，功耗仅400µW，FoMs达到186.5dB。

💡 主要创新点

• 提出智能跟踪（Smart-Tracking）技术，通过动态步长调整将输入跟踪带宽扩展到奈奎斯特频率，解决了传统Zoom ADC跟踪带宽受限的问题。
• 采用浮尾电阻（Floating-Tail-Resistor）线性化Gm-C积分器，在低电压下实现高线性度和高效率，提升了整体ADC性能。

🏷 关键词

📄 原文摘要

Abstract This paper presents a 98.5dB SNDR, 250kHz bandwidth CT incremental Zoom ADC. The design features a chopped capacitive front-end, Gm-C residue integrator, and 10b SAR ADC. A smart-tracking (ST) technique with dynamic step-sizing extends the input tracking bandwidth to the Nyquist frequency. A floating-tail-resistor (FTR) linearized Gm-C integrator achieves high linearity and efficiency. Fabricated in 28nm CMOS, the ADC consumes 400µW and achieves a superior 186.5dB FoMs. High-resolution, energy-efficient ADCs with sampling rates exceeding 100kHz are in high demand for emerging IoT and wearable devices, posing a challenge to conventional ADC architectures. The Zoom ADC, which combines a front-end coarse quantizer with a backend delta-sigma modulator (DSM), achieves high efficiency and linearity, making it a popular solution for these applications. Recently, continuous-time (CT) zoom ADCs with capacitive

👥 作者与机构

Chaoyang Xing, Yilu Cui, Sining Pan, Yi Zhong, Nan Sun, Lu Jie

Tsinghua University, Beijing, China