320 X 240 Pixels CMOS Digital Image Sensor with Wide Dynamic Range

摘要

A 320X240 CMOS image sensor is demonstrated, which is implemented by a standard 0. 6 μm 2P2M CMOS process. For reducing the chip area, each 2X2 - pixel block shares a sample/hold circuit, analog- to-digital converter and 1 - b memory. The 2 X 2 pixel pitch has an area of 40 μm X 40 μm and the fill factor is about 16%. While operating at a low frame rate, the sensor dissipates a very low power by power-management circuit making pixel-level comparators in an idle state. A digital correlated double sampling, which eliminates fixed pattern noise, improves SNR of the sensor, and multiple sampling operations make the sensor have a wide dynamic range.