A 0.7V 36µW 85dB-DR Audio ΔΣ Modulator Using Class-C Inverter

📋 论文概要

本文提出了一种采用Class-C反相器的音频ΔΣ调制器，能够在0.7V低电压下实现36µW超低功耗和85dB动态范围，解决了传统OTA在超深亚微米工艺中受阈值电压限制难以低电压工作的问题。

💡 主要创新点

• 提出使用Class-C反相器替代传统OTA作为关键构建模块，实现低电压下高效工作。
• 在0.7V供电下实现了36µW的极低功耗和85dB的动态范围，满足便携式音频系统需求。

🏷 关键词

📄 原文摘要

Low-voltage low-power ΔΣ modulators are required for many portable systems. Although SC ΔΣ modulators provide reliable high-resolution A/D conversion, the traditional SC circuit design faces many challenges as the fabrication technology moves into ultra deep-submicron CMOS technology. An OTA is not only the key building block, but also the major power consuming block in SC circuits. The traditional OTAs with differential pair have the fundamental limitation of input common-mode range, because the threshold voltage of transistors is not scaled at the rate of the supply voltage. Therefore, OTA design is the most difficult task in SC circuit design especially in scaled CMOS technologies [1, 2]. Low-voltage ΔΣ modulators have been reported in [1-4]. They use low-voltage circuit-design techniques such as power efficient lowvoltage OTAs [1, 2], a body-driven technique [3] and an OTAless technique [4]. However, the signal range is strictly limited by the

👥 作者与机构

Youngcheol Chae, Inhee Lee, Gunhee Han

Yonsei University, Seoul, Korea