A Multi-Channel Neural-Recording Amplifier System with 90dB CMRR Employing CMOS-Inverter-Based OTAs with CMFB Through Supply Rails in 65nm CMOS

📋 论文概要

该论文提出了一种多通道神经记录放大器系统，采用基于CMOS反相器的运算跨导放大器（OTA）并通过共模反馈（CMFB）技术，实现了90dB的共模抑制比（CMRR），有效抑制了来自电源线或肌电信号的共模干扰，解决了多通道神经记录中高共模干扰的问题。

💡 主要创新点

• 采用CMOS反相器结构实现OTA，降低了功耗和噪声，同时通过共模反馈技术提升了共模抑制比。
• 实现了90dB的高CMRR，满足神经信号记录对共模干扰抑制的严格要求。

🏷 关键词

📄 原文摘要

In addition to minimizing input-referred noise and lowering power consumption, a good multi-channel neural amplifier system should be able to significantly reject common-mode electrical interference (CMI). The dominant source of CMI comes from capacitive coupling of electrical mains supply line or EMGs onto neural tissues and can be as high as 100mVpp [1]. Thus any neural recording setup needs a total common-mode rejection ratio (TCMRR) of at least 70dB for a minimum detectable neural signal of 5μVrms [1]. However, multi-channel neural amplifiers are commonly implemented with a shared reference input whose input impedance is several times lower than that of corresponding signal inputs

👥 作者与机构

Kian Ann Ng, Yong Ping Xu

National University of Singapore, Singapore, Singapore