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An Optically Addressed Nanowire-Based Retinal
一种基于纳米线、光寻址的无线供电视网膜修复芯片系统。
180-nm CMOS, 3 µC电荷输出, 20-nC分辨率, 73% RF-to-stimulation能效
视网膜修复光寻址纳米线无线供电电荷计量
▸创新点1:采用光寻址纳米线电极阵列(系统创新)。通过纳米工程光敏电极阵列与SoC协同设计,仅需两根导线连接,显著简化了植入式系统的布线复杂度,同时提高了空间分辨率,支持高达20nC的电荷分辨率。
▸创新点2:无线电荷计量技术降低热耗散(电路创新)。通过将电压调节和电荷平衡刺激控制移至体外,采用占空比无线电荷计量技术,减少植入体附近的发热,实现73%的射频至刺激功率效率,保护敏感视网膜组织。
▸创新点3:眼动引起的功率波动校准技术(方法创新)。提出动态校准算法,实时补偿因眼球运动导致的无线功率传输波动,确保刺激参数的稳定性,提升系统可靠性。
▸创新点4:180nm CMOS工艺实现高集成度(工艺创新)。在180nm工艺下集成无线供电、刺激控制和校准功能,单芯片输出3µC电荷,兼顾高能效与小型化。
Abstract
Current retinal prostheses (RPs) have not achieved
useful vision restoration, as their resolution is limited by power
dissipation and complexity of interconnect. This article presents
an inductively powered wireless system on a chip (SoC) for
an electrically controlled, optically addressed retinal prosthetic
system. The SoC interfaces to a co-fabricated nanoengineered
photosensitive electrode array using only two wires. To reduce
the thermal dissipation near sensitive retinal tissue, the propose