标题: | 应用于视网膜疗程之植入式人工视网膜与其电源控制电路 A CMOS IMPLANTABLE RETINAL CHIP WITH SOLAR CELL POWER SUPPLY CONTROL CIRCUIT FOR RETINA PROSTHESES |
作者: | 万谌 Chen Wan 吴重雨 林伯刚 Chung-Yu Wu Po-Kang Lin 电子研究所 |
关键字: | 人工视网膜;低功率振荡器;太阳能电池;电能控制系统;artificial retina;low-power oscillator;solar cell;power control system |
公开日期: | 2007 |
摘要: | 本篇论文中描述一个应用于下视网膜疗程中的人工矽视网膜晶片设计。包含光电池架构的设计、晶片时脉产生器的设计、基本像素的设计与电能控制系统的设计。在光电池供电系统中,我们提出新的光电池架构并将电路系统与光电池同时整合在CMOS积体电路晶片上的设计也经由许多相关的测试元件与设计改良验证其使用特性。我们并且初步设计并实作由感光二极体阵列构成之视网膜晶片的体外生物实验,成功的验证视网膜晶片刺激视网膜细胞的生物反应。而晶片时脉系统经过设计、模拟、量测后验证为一超低功率时脉产生器,此振荡器可在3.6mW/cm2的光照强度下产生1.632KHz的震荡其电路消耗功率仅为5.2nW。此植入式人工视网膜晶片使用了由生物特性启发而得的电能控制系统,所以在下视网膜疗程中的电能使用效益上有所改善。在应用此分区供电的架构下,此晶片可以产生约三倍的有效输出电流已提供视网膜细胞所需要的电性刺激。此晶片在3.6mW/cm2的光照强度下可以得到约略844nA的电流输出、在5.06mW/cm2的光照强度下可以得到约略1.72μA的电流输出。在台湾积体电路制造股份有限公司与国家晶片系统中心的帮助下,此视网膜晶片将以0.18微米制程实现。基于上述特性,此光电池架构、视网膜晶片与电源控制系统对下视网膜疗程中的人工矽视网膜晶片设计上有相当程度的贡献。 In this thesis, a retinal chip has been designed, analyzed, and fabricated to improve the power efficiency of the sub-retinal prostheses. The preliminary in vitro experiment of the silicon retina chip which composed of micro photodiode array has also been designed and verified. The silicon retina with MPA can successfully trigger the retina cell and the electrical-response is similar to the light-response in retina cell. The feasibility of on-chip solar cell supply system which integrated with circuit system in CMOS technology has been verified in the work. An ultra-low power clock generator is also designed and verified in this work. This clock generator can generate a clock signal with 1.632KHz under 3.6mW/cm2 incident light intensity with only 5.2nW power consumption. A three times output stimulating current is achieved by taking advantage of the bio-inspired divisional power supply architecture. The stimulating output current is approximately 844nA under the illumination of 3.6mW/cm2 light intensity and 1.72μA under the illumination of 5.06mW/cm2 light intensity. The retinal chip fabricated with a standard 0.18μm tsmc CMOS process demonstrate good mimic of electrical behavior of human retina with low-power consumption. Because of its characteristic, the proposed power management system could be considered as one of the highly integrated solutions for the sub-retinal implant chips. |
URI: | http://140.113.39.130/cdrfb3/record/nctu/#GT009411711 http://hdl.handle.net/11536/80622 |
显示于类别: | Thesis |
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