A Light-Tolerant Wireless Neural Recording IC for Motor Prediction With Near-Infrared-Based Power and Data Telemetry.
A Light-Tolerant Wireless Neural Recording IC for Motor Prediction With Near-Infrared-Based Power and Data Telemetry.
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DOI：
10.1109/jssc.2022.3141688
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发表时间：
2022-04
影响因子：
5.4
通讯作者：
Jang, Taekwang
中科院分区：
文献类型：
--
作者：
Lim, Jongyup;Lee, Jungho;Moon, Eunseong;Barrow, Michael;Atzeni, Gabriele;Letner, Joseph G.;Costello, Joseph T.;Nason, Samuel R.;Patel, Paras R.;Sun, Yi;Patil, Parag G.;Kim, Hun-Seok;Chestek, Cynthia A.;Phillips, Jamie;Blaauw, David;Sylvester, Dennis;Jang, Taekwang
关键词：
小型化和无线近红外（NIR）为基础的神经记录器与光学供电和数据遥测已被引入作为一个有前途的方法，安全的长期监测与最小的物理尺寸之间的国家的最先进的独立记录器。然而，基于NIR的神经记录IC的主要挑战是在存在来自结型二极管的光致寄生短路电流的情况下保持稳健的操作。当信号电流保持较小以降低功耗时尤其如此。在这项工作中，我们提出了一种用于运动预测的耐光和低功耗神经记录IC，可以在高达300 μW/mm 2的光照下完全发挥作用。该器件采用4.1 NEF伪无电阻放大器、片内神经特征提取器和单个微尘电平增益控制，在38° C时实现了0.57 μW的同类最佳功耗。应用20通道预先记录的猴子神经信号，IC预测手指的位置和速度的相关系数分别高达0.870和0.569，与个人微尘水平增益控制启用。此外，无线测量演示通过光功率和数据遥测使用定制的PV/LED GaAs芯片线键合到拟议的IC。
Miniaturized and wireless near-infrared (NIR) based neural recorders with optical powering and data telemetry have been introduced as a promising approach for safe long-term monitoring with the smallest physical dimension among state-of-the-art standalone recorders. However, a main challenge for the NIR based neural recording ICs is to maintain robust operation in the presence of light-induced parasitic short circuit current from junction diodes. This is especially true when the signal currents are kept small to reduce power consumption. In this work, we present a light-tolerant and low-power neural recording IC for motor prediction that can fully function in up to 300 μW/mm2 of light exposure. It achieves best-in-class power consumption of 0.57 μW at 38° C with a 4.1 NEF pseudo-resistorless amplifier, an on-chip neural feature extractor, and individual mote level gain control. Applying the 20-channel pre-recorded neural signals of a monkey, the IC predicts finger position and velocity with correlation coefficient up to 0.870 and 0.569, respectively, with individual mote level gain control enabled. In addition, wireless measurement is demonstrated through optical power and data telemetry using a custom PV/LED GaAs chip wire bonded to the proposed IC.
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