A test structure for characterization of CMOS APS

A test structure to characterize CMOS APS image sensor is presented. Individual photodiodes and pixels as well as an image sensor array of 64/spl times/64 active pixels with selectable linear or logarithmic operation modes are designed. A test chip includes these features in addition to on-chip timing and control digital circuits as well as correlated double sampling have been built on a 0.6 /spl mu/m CMOS process. The test methodology and preliminary simulation results are presented.