节能的LFP-自适应式动态变焦和跟踪增量 ΔΣ 前端,用于双频段下皮层录音
IEEE transactions on biomedical circuits and systems
|July 25, 2023
概括
这项研究介绍了一种节能集成电路,用于多通道大脑记录. 它的新缩放和跟踪模拟到数字转换器显著降低了功耗,同时增强了皮下神经活动的信号分辨率.
科学领域:
- 神经科学是一个神经科学.
- 电气工程 电气工程
- 生物医学工程 生物医学工程
背景情况:
- 下皮层记录需要高分辨率,低功耗的集成电路.
- 现有的方法往往在功率效率和信号保真方面扎.
研究的目的:
- 开发一种高功率的模拟前端集成电路 (IC) 用于多通道,双频段的皮层下录音.
- 为了提高分辨率和降低神经记录设备的功耗.
主要方法:
- 实现了一个增量 ΔΣ 模拟到数字转换器 (IADC),具有动态变焦和轨道方案.
- 该方案可自适应地调整输入动态范围以解决小动作潜力.
- 使用180nm标准CMOS工艺制造了一种原型四通道前端IC.
主要成果:
- 实现了11.3位有效位数 (ENOB) 在6.8μW,为沃尔登和SNDR优点数字 (FoM) 设定了新的基准.
- 与最先进的神经记录前端和类似的变焦/跟踪ADC相比,其表现优越.
- 由于内在的双频段记录,可使皮层下信号分离的FPGA后处理资源减少45.8%以上.
- 前端IC显示了5.9的NEF,输入引用噪声为8.2μVrms,适用于皮层下记录.
- 通过体内动物实验验验证的性能.
结论:
- 开发的高功率的模拟前端IC与变焦和轨道IADC非常适合用于高分辨率的皮质下录音.
- 新的IADC方案提供了显著的节能和更好的信号分辨率.
- 内在的双频记录能力简化了信号处理.
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