A 0.004mm2 200MS/s Pipelined SAR ADC with kT/C Noise Cancellation and Robust Ring-Amp

📋 论文概要

提出了一种0.004mm² 200MS/s的流水线SAR ADC，通过kT/C噪声消除技术大幅减小第一级采样电容，同时设计PVT鲁棒的环形放大器，在降低功耗和面积的同时实现高速高精度转换。

💡 主要创新点

• 提出kT/C噪声消除技术，允许使用远小于传统方案的采样电容，从而降低ADC驱动器和参考缓冲器的设计复杂度与功耗。
• 设计了一种对工艺、电压、温度变化具有鲁棒性的环形放大器(Ring-Amp)，在低功耗下实现高速残余放大。

🏷 关键词

📄 原文摘要

Peking University, Beijing, China 1 2 Pipelined ADCs are widely used for high-speed high-resolution applications, but there are two challenges. First, limited by the kT/C noise requirement, its 1st-stage sampling capacitor has to be sufficiently large (e.g., several pF). This poses significant burdens for the ADC driver and the reference buffer, leading to high design complexity and huge power/area costs on the system level, especially when high linearity, high sampling rate, and low supply voltage are required. Second, it is challenging to design a low-power, high-speed, and PVT-robust residue amplifier in an advanced process. To address these two challenges, this work proposes a PVT-robust ring-amp with kT/C noise cancellation capability. It enables a 1.3mW 200MS/s 67dB-SNDR pipelined ADC with only 128fF input capacitance. Recently, a few techniques have been proposed to suppress the kT/C noise in ADCs, but

👥 作者与机构

Mingtao Zhan1, Lu Jie1, Xiyuan Tang2, Nan Sun1

Tsinghua University, Beijing, China