Analog-to-digital converters, and image sensors and image processing devices having the same

摘要

An analog-digital converter (ADC) includes a correlated double sampling (CDS) circuit configured to perform CDS on each of a reset signal and an image signal output from a pixel to generate a correlated double sampled reset signal and a correlated double sampled image signal, respectively. A delta sigma (&Dgr;&Sgr;) ADC, also included in the ADC, is configured to output a difference between a first digital code that is generated by performing &Dgr;&Sgr; analog-digital conversion on the correlated double sampled reset signal and a second digital code that is generated by performing &Dgr;&Sgr; analog-digital conversion on the correlated double sampled image signal.