A 0.8V 10b 80kS/s SAR ADC with Duty-Cycled Reference Generation

📋 论文概要

该论文提出了一款0.8V 10位80kS/s的逐次逼近型模数转换器（SAR ADC），通过占空比控制参考电压生成技术，解决了低功耗传感器系统中参考电压生成器（RVG）的挑战，实现了2.4fJ/转换步的高能效。

💡 主要创新点

• 采用占空比控制的参考电压生成技术，在低电源电压（0.8V）和有限功耗（nW级）下实现稳定的参考电压，提升了电源抑制比和线性度。
• 通过优化SAR ADC架构和参考电压生成电路，实现了2.4fJ/转换步的超低功耗，优于传统设计。

🏷 关键词

📄 原文摘要

sensed signal. State-of-art SAR ADCs can accomplish this goal with high power-efficiency (<10fJ/conversion-step) [1-4]. The reference voltage design is critical for the ADC performance to obtain good PSRR, low line-sensitivity and a stable supply-independent full-scale range. However, solutions for efficient reference voltage generators (RVGs) are typically ignored in low-power ADC publications. In reality, due to the low power supply (usually sub-1V) and limited available power (nW-range), the RVG is a challenge within the sensor system. In this work, a 2.4fJ/conversion-step SAR ADC with integrated reference is implemented. The 0.62V CMOS RVG consumes 25nW. To further reduce RVG power, it can be duty-cycled down to 10% with no loss in ADC performance.

👥 作者与机构

Maoqiang Liu, Pieter Harpe, Rainier van Dommele, Arthur van Roermund

Eindhoven University of Technology, Eindhoven, The Netherlands Autonomous wireless sensor nodes need low-power low-speed ADCs to digitize the