Patent ID: 8059173
Filing Date: 2011-11-15
Classification: H04N

Abstract:
1. A correlated double sampling (CDS) pixel comprising: a sensor circuit to generate a voltage value corresponding to electromagnetic radiation received on a photodetector included therein; and a sample and hold (S/H) stage including a sample switching-element and first and second capacitor-elements, the first capacitor-element coupled between an output of the sensor circuit through the sample switching-element and a predetermined reference potential, the second capacitor-element having a first node coupled to the output of the sensor circuit through the sample switching-element and a second node coupled in series with an output of the S/H stage, the second node of the second capacitor-element further coupled through a calibration switching element to a calibration voltage (Vcalib) to sample a reset voltage value on the photodetector at a first time (t