A 70dB DR 10b 0-to-80MS/s Current-Integrating SAR ADC with Adaptive Dynamic Range

📋 论文概要

该论文提出了一种具有自适应动态范围的电流积分型SAR ADC，通过内置可变增益实现了0-80MS/s的采样率、10位分辨率和70dB动态范围，解决了传统电荷域SAR ADC中前置VGA的功耗瓶颈问题。

💡 主要创新点

• 采用电流积分型SAR架构，将可变增益功能集成到ADC内部，消除了对独立VGA的需求，降低了系统功耗。
• 提出自适应动态范围技术，根据输入信号幅度动态调整积分时间，在保持高动态范围的同时优化了功耗。

🏷 关键词

📄 原文摘要

to develop more innovative systems to improve performance. Remarkable improvements have been recently realized on charge-domain SAR ADCs to reach the speed of a few tens of MS/s with medium resolution and low power consumption [1,2]. This has shifted the power bottleneck to the preceding block in a wireless receiver, conventionally the Variable-Gain Amplifier (VGA) that has to charge a few pF of ADC sampling capacitor with rail-to-rail voltage within a few ns with 10b linearity. This paper shows that a charge-domain SAR ADC with built-in variable gain provides improved system-level power efficiency compared to its voltage-domain counterpart by eliminating the issues related to large input capacitors. As depicted in Fig. 27.7.1, the presented circuit combines the functionality of a traditional VGA and ADC

👥 作者与机构

Badr Malki1,2, Takaya Yamamoto3, Bob Verbruggen1, Piet Wambacq1,2, Jan Craninckx1

imec, Leuven, Belgium Vrije Universiteit Brussel, Brussels, Belgium 3 Renesas Electronics, Takasaki, Japan 1 2 The constant demand for wireless systems pushes engineers and researchers