8 |
CMOS Color and Image Sensor Circuit Design |
8.1 INTRODUCTION
An image sensing optical receiver, such as complementary metal-oxide semiconductor (CMOS) image sensors (CIS), in general, is comprised of photodiode, analog, and mixed-signal circuits to amplify small photocurrents into digital signals. The CMOS image sensors are now the technology of choice for most imaging applications, such as digital video cameras, scanners, and numerous others. Even though their sensitivity does not reach one of the best actual charge-coupled device CCD’s (whose fill factor is about 100%), they are now commonly used because of their multiple functionalities and their easy fabrication.
Three types of the topology of CMOS color sensors are discussed, namely, ...
