A Spatially Diverse 2TX-3RX Galvanic-Coupled Transdural Telemetry for Tether-Less Distributed Brain–Computer Interfaces

Chengyao Shi;Yuming He;Marios Gourdouparis;Guido Dolmans;Yao-Hong Liu
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Abstract

A near-field galvanic coupled transdural telemetry ASICs for intracortical brain-computer interfaces is presented. The proposed design features a two channels transmitter and three channels receiver (2TX-3RX) topology, which introduces spatial diversity to effectively mitigate misalignments (both lateral and rotational) between the brain and the skull and recovers the path loss by 13 dB when the RX is in the worst-case blind spot. This spatial diversity also allows the presented telemetry to support the spatial division multiplexing required for a high-capacity multi-implant distributed network. It achieves a signal-to-interference ratio of 12 dB, even with the adjacent interference node placed only 8 mm away from the desired link. While consuming only 0.33 mW for each channel, the presented RX achieves a wide bandwidth of 360 MHz and a low input referred noise of 13.21 nV/√ H z. The presented telemetry achieves a 270 Mbps data rate with a BER < 10 −6 and an energy efficiency of 3.4 pJ/b and 3.7 pJ/b, respectively. The core footprint of the TX and RX modules is only 100 and 52 mm 2 , respectively, minimizing the invasiveness of the surgery. The proposed transdural telemetry system has been characterized ex-vivo with a 7-mm thick porcine tissue.
用于无系绳分布式脑机接口的空间多样性 2TX-3RX Galvanic-Coupled 经硬脑膜遥测技术。
本文介绍了一种用于皮层内脑机接口的近场电耦合硬膜外遥测 ASIC。该设计采用双通道发射器和三通道接收器(2TX-3RX)拓扑结构,引入了空间分集,可有效缓解大脑和头骨之间的错位(横向和旋转),当接收器处于最坏情况盲点时,路径损耗可恢复 13 dB。这种空间分集还使所提出的遥测技术能够支持大容量多植入体分布式网络所需的空间分割多路复用。即使相邻干扰节点与所需链路的距离只有 8 毫米,它也能实现 12 dB 的信噪比。每个信道的功耗仅为 0.33 mW,同时,所介绍的 RX 实现了 360 MHz 的宽带宽和 13.21 nV/√Hz 的低输入参考噪声。该遥测系统的数据传输速率为 270 Mbps,误码率为 6,能效分别为 3.4 pJ/b 和 3.7 pJ/b。发射和接收模块的核心占地面积分别仅为 100 平方毫米和 52 平方毫米,最大程度地降低了手术的侵入性。拟议的硬膜外遥测系统已通过 7 毫米厚的猪组织进行了体外测试。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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