Abstract
A time error mathematical model of nonlinear response and noise is established in order to achieve low time error of correlated double sampling pulse-width-modulation (CDS PWM) pixel. By analysis and computer, the time error under fixed pattern noise (FPN), reset noise, shot noise, reference noise of pixel-level comparator, an integrated model is established. By means of the model, appropriate selection of high/low reference voltage of pixel-level comparator can decrease time error of CDS PWM. These results serve as a guideline for the design of CDS PWM pixel.
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