A 256×256 CMOS imaging array with wide dynamic range pixelsand column-parallel digital output

摘要

A stepped reset-gate voltage technique is applied to a CMOS activenpixel sensor array to increase dynamic range by 26 dB. A frame rate ofn390 frames/s is achieved using column-parallel output circuits.nSwitched-capacitor correlated double-sampling circuits reducenfixed-pattern noise to 4.0 mV (dark). Cyclic analog-to-digitalnconverters achieve approximately 9-b accuracy. At 30 frames/s, randomnnoise is 0.56 mV (dark), optical dynamic range is 96 dB, and power is 52nmW