RANDOM ADDRESSABLE 2048X2048 ACTIVE PIXEL IMAGE SENSOR

In this paper, ave discuss the design, design issues, fabrication, and performance of a 2048 x 2048 active pixel image sensor in a 0.5-mu m standard CMOS process. Each pixel, 7.5 x 7.5 mu m(2), consist of three transistors and a photo diode, resulting in a 12-million transistor c hip with a die size of 16.3 x 16.5 mm. The pixel has a nonintegrating direct readout architecture, with a logarithmic light-to-voltage conve rsion. This allows the array to he fully random accessible, both in sp ace and time. The sensor has eight analog outputs, each with a pixel r ate of 4.5 MHz, which implies a maximum frame rate of eight full frame s per second. Sub-sampling or windowing retakes higher frame rates pos sible. The yield of the senses is high if one accepts a small number o f bad pixels.