A 6.5µW 10kHz-BW 80.4dB-SNDR Continuous-Time ΔΣ Modulator with Gm-Input and 300mVpp Linear Input Range for Closed-Loop Neural Recording

📋 论文概要

该论文提出了一种用于闭环神经记录的连续时间ΔΣ调制器，采用Gm输入结构，实现了300mVpp的线性输入范围，能够处理DC电极偏移和大刺激伪影。在6.5µW功耗下达到10kHz带宽和80.4dB SNDR，避免了传统AC耦合LNA所需的大电容和面积开销。

💡 主要创新点

• 采用Gm输入级替代传统AC耦合LNA，直接处理大直流偏移和刺激伪影，无需大输入电容，减小芯片面积并提高输入阻抗。
• 在极低功耗（6.5µW）下实现80.4dB SNDR和10kHz带宽，适用于高能效的闭环神经记录系统。
• 实现了300mVpp的宽线性输入范围，满足神经信号记录中动态范围要求。

🏷 关键词

📄 原文摘要

Kwandong University International St. Mary’s Hospital, Incheon, Korea 1 2 Closed-loop neural recording requires a front-end with a wide DR to record small neural signals without distortion in the presence of a DC electrode offset (~50mV) and a large stimulation artifact (~200mVpp). To remove DC offset, a conventional architecture uses an AC-coupled LNA and a subsequent ADC [1]. However, to realize a small HPF cut-off frequency (<1Hz), the LNA requires a large input capacitor, resulting in a reduced input impedance and an increased area. Additionally, the LNA is prone to be saturated by large stimulation transients. To address these issues, direct digitization for neural recording is increasingly popular [2-5] and offers great potential for reducing area and power consumption

👥 作者与机构

Changuk Lee1, Taejune Jeon1, MoonHyung Jang1, Sanggeon Park2,3,4,

Yeowool Huh3,4, Youngcheol Chae1 Yonsei University, Seoul, Korea University of Science and Technology, Daejeon, Korea 3 Catholic Kwandong University, Gangneung, Korea 4 Catholic