An Ultrasound-Powering TX with Standing-Wave Peak Tracking Employing Adiabatic Power Sensing Achieving 82% Power-Tracking Accuracy and <90ms Settling Time for Brain Implants

📋 论文概要

本文提出了一种用于脑植入物的超声供电发射机芯片，采用绝热功率传感和片上自主驻波峰值跟踪，实现了82%的功率跟踪精度和高达2.7倍的接收功率调节改善，功耗仅为43µW。

💡 主要创新点

• 提出了一种低功耗绝热功率传感方案，将功率跟踪功耗降低至43µW
• 实现了片上自主驻波峰值跟踪，无需外部控制，显著提高接收功率调节性能
• 通过驻波峰值跟踪状态机，实现快速建立时间（<90ms）和高精度功率跟踪（82%）

🏷 关键词

📄 原文摘要

Abstract An ultrasound powering TX ASIC for brain implants with autonomous on-chip standingwave peak tracking for RX power (PDL) regulation is presented. With a proposed adiabatic power-sensing scheme, the TX consumes 43µW for power tracking, and the system achieves a settling time of <90ms while using the standing-wave peak-tracking FSM. The TX can achieve PDL improvement of up to 2.7× with a power-tracking accuracy of 82%. State-of-the-art intracortical brain-computer interfaces rely on implants on the cortex surface to achieve selective neural recording and stimulation [9]. Wireless powering replaces wires penetrating the dura (a membrane above the cortex), thus enabling safe and long-term sub-dural implantation (Fig. 3.4.1). To increase the powering-link efficiency, twostage approaches involving a relay cranial implant have recently been presented [1,6], with ultrasound (US) serving as the “trans-dural” wireless powering modality thanks to its low

👥 作者与机构

Marios Gourdouparis1,2, Chengyao Shi1, Jiang Liu1, Yuming He1, Stefano Stanzione1, Wouter Serdijn2, Yao-Hong Liu1

imec, Eindhoven, The Netherlands, 2TU Delft, Delft, The Netherlands