CORRELATED DOUBLE SAMPLING CIRCUIT FOR IMPROVING SIGNAL TO NOISE RATIO AND SIGNAL CONVERTING METHOD USING THE SAME

摘要

The amplifier (410) has a switching network coupled to capacitors and a pixel of an image sensing device. The network couples the capacitors in parallel to generate an initial correlated double sampling (CDS) difference voltage. The network couples the capacitors in series to generate a final CDS difference voltage that is input to an analog to digital voltage converter (ADC) (430) for conversion into a digital signal. Independent claims are also included for the following: (A) an image sensing device comprising a pixel for generating a reset voltage and an image voltage (B) a method for correlated double sampling (CDS) within an image sensing device comprising a switching network to couple respective capacitors.