Patent ID: 6791612
Filing Date: 2004-09-14
Classification: H04N

Abstract:
A CMOS image sensor based on a correlated double sampling, the CMOS image sensor comprising:a) a single common node; b) a plurality of unit pixels in parallel connected to the single common node; c) an amplifying component coupled to the single common node for amplifying a voltage of the single common node and outputting the amplified voltage; d) an output component for receiving the amplified voltage from the amplifying component and outputting a data voltage level and a reset voltage level, wherein the unit pixel includes: a generating component for receiving light from an object and for generating and integrating photoelectric charges, a transfer component for transferring the photoelectric charges generated in the generating component to a first node, a reset component for resetting the first node, and an addressing component for receiving address signals from an external controller, wherein a gain of the amplifying component is given by GA=(Cph+Cp)*D/Ct where GA is the gain of the amplifying component, D is a desired dynamic range, Cph is a capacitance generated in the generating component, Cp is a sum of parasitic capacitance of the generating component and diffusion capacitance, and Ct is a total value of parasitic capacitance of all unit pixels and diffusion capacitance and output capacitance of the single common node.