A Study of CMOS Low-Dropout (LDO) Regulator and Implementation of the EOG-Based Interface System

• Main Authors: Cheng-Han Wu, 吳承翰
• Other Authors: Yu-Cherng Hung
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/30298057019758605367

碩士 === 國立勤益科技大學 === 電子工程系 === 99 === This thesis is comprised of two topics: the first study is the design methodology of the low-dropout (LDO) regulator. The second research is the design and implementation of the EOG-based interface system. We describe the applications and importance of power regulators. Then, the LDO literature, related specifications, and design considerations are reviewed. An example of LDO regulator design is described step by step. We will present the design methodology for LDO regulator from specifications, power transistor, reference voltage circuit, error amplifier, and circuit protection circuit in sequence. For design of reference voltage circuit, a start-up circuit failed by the supply voltage variation is improved in the thesis. This LDO design was simulated using TSMC 0.35 m CMOS technologies by HSPICE. The second part: electrooculography (EOG) based communication prototyping system had been realized for paralyzed patients, who cannot talk and write. Without the utilization of computer, this prototyping system allows the patients by eyes action: look right and look left, to express their meaning to the outside in a short time. Due to the hierarchical and automatic scanning methodologies, the patients use easily and feel not too tired after operated a long time. The experimental system has been achieved and tested successfully. The prototyping system has advantages of low operation complexity, low cost, and portability.