使用灵活电子的脑电脑接口:一个a-IGZO前端为主动ECoG电极
Kyle van Oosterhout1, Ashley Chilundo1, Mariana P Branco2
1Department of Electrical Engineering, Eindhoven University of Technology, Eindhoven, 5612AP, The Netherlands.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|December 18, 2024
概括
灵活的电子设备可以实现高通道数的大脑计算机接口 (BCI). 这种使用无形---氧化物薄膜晶体管 (a-IGZO TFTs) 的新型主动模拟前端实现了低噪音和低功率,推进了BCI技术.
科学领域:
- 神经科学是一个神经科学.
- 材料科学 材料科学 材料科学
- 电气工程 电气工程
背景情况:
- 大脑计算机接口 (BCI) 对于高通道数和可植入系统需要低功率密度.
- 灵活的电子提供了一个可扩展的解决方案,用于复合在先进的BCI设计.
研究的目的:
- 为高频道数BCI开发一个灵活的主动模拟前端.
- 为了实现可植入BCI应用的极低功率密度 (<15mW cm-2),至关重要.
主要方法:
- 使用薄膜上的无形---氧化物 (a-IGZO) 薄膜晶体管 (TFT) 制造一个活跃的模拟前端.
- 在电路设计中使用了修改后的引导负载放大器.
- 用传统的BCI记录测试了前端,并执行了手势分类.
主要成果:
- 实现了70nV/√Hz的输入引用噪声,功耗为46μW (3.5mW cm-2).
- 展示了灵活的前端,噪声效率系数 (NEF) 为9.8,与解决方案相比,比以前的灵活设计优于10倍以上.
- 在使用灵活的前端输出时,在手势分类中实现了94%的准确性.
结论:
- 这种灵活的主动前端显著改善了高通道数量BCI的最新状态.
- 能够监测大脑区域的功率密度降低,为下一代活跃BCI电极网铺平了道路.
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