東京大学大学院工学系研究科 電子工学専攻
Department of Electronic Engineering, The University of Tokyo
Abstract
This thesis describes the design and implementation of a new CMOS image sensor for ambient light suppression by using a current-mode pixel circuit. To obtain an acceptable accuracy, a procedure to reduce the negative effects of ambient light on CMOS imaging is proposed and implemented. A prototype pixel circuit including a switched current memory for ambient light storage associated with a subtraction and I-V conversion circuit was designed with a 0.18um technology. The sensor operates with a high accuracy in a very weak current range and the effect of the charge injection related with the ambient light storage is reduced significantly by employing an efficient charge compensation scheme. The simulation results show that the current memorization efficiency of the proposed pixel circuit is more than 99% and the suppression efficiency is around 99% for high background illumination with a very low source current. The sensor can achieve a Signal-to-Background Ratio (SBR) of -32dB. It is also capable of internally generated Region of Interest (ROI) readout. Ambient light suppression and ROI readout options can be chosen by means of its internal sensor controller block. All the timing information is parametrized and Open Core Protocol (OCP) interface implemented in the sensor controller circuit enables the sensor to communicate with the external user.
発行年
2008-03-24
日本十進分類法
549
学位名
修士(工学)
学位
master
研究科・専攻
工学系研究科電子工学専攻
学位授与年月日
2008-03-24
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CMOS Image Sensor for Ambient Light Suppression by means of Current-mode Pixel Circuit
37066911.pdf
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