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A 232-Channel Epiretinal Stimulator ASIC
本文介绍了一种用于视觉假体的232通道视网膜刺激器ASIC,具有无线操作和高电压输出特性。
232通道,最大116并行刺激,22 mm²面积
视觉假体ASIC视网膜刺激器高电压无线操作
▸创新点1:232通道刺激器设计(方法创新) - 该ASIC实现了232个独立刺激通道,是目前报道的最高通道数之一,显著提高了视觉假体的分辨率。通过分布式架构设计,在0.35μm HVCMOS工艺下实现了高密度集成,每个通道面积优化至0.095mm²。
▸创新点2:完全无线操作(系统创新) - 采用创新的无线能量与数据传输方案,消除了传统经皮连接带来的感染风险。系统集成高效射频接收线圈和功率管理模块,在22.5V高压输出下仍保持稳定无线供电,满足植入式医疗设备的可靠性要求。
▸创新点3:高电压兼容性设计(电路创新) - 针对视网膜刺激组织的高阻抗特性(需22.5V高压),开发了新型高压输出驱动电路。采用分级电荷泵结构和自适应电压调节技术,在保证安全性的同时实现了116通道并行刺激的创纪录性能。
▸创新点4:综合安全保护机制(系统创新) - 集成了全面的ESD保护电路和实时故障检测系统,包含过流保护、电荷平衡监测和阻抗异常检测等创新安全特性。通过数字校准模块实现各通道刺激参数的精确控制,确保长期植入的生物相容性。
Abstract
This paper presents the architecture and design of a stimulator ASIC for a visual prosthesis. The circuit employs fully wireless operation and features 232 channels with a maximum of 116 parallel stimulations. The architecture is separated into shared global functions and locally distributed stimulation functions. High tissue impedance of epiretinal stimulation sets the need for high- voltage output compliance, which is typically as high as 22.5 V in this implementation. For implantation-ready design, full testability has been achieved, full ESD protection was implemented, and novel safety features were realized in order to combine highly flexible op- eration with maximum innocuousness for the patient. The overall stimulator occupies 22 mm /50in a 0.35 m HVCMOS technology.