CDS CIRCUIT AND ANALOG-DIGITAL CONVERTER USING DITHERING, AND IMAGE SENSOR HAVING SAME

摘要

A correlated double sampling circuit includes a first input terminal receiving a ramp signal having first and second ramp sections, a second input terminal receiving a pixel signal, and a comparing circuit comparing the ramp signal with the pixel signal to generate an output signal, wherein the comparing circuit changes a point in time at which the output signal logically transitions during the first ramp section and the second ramp section in response to an applied dithering enable signal.

主权项

1. A correlated double sampling (CDS) circuit comprising:
a first input terminal that receives a ramp signal comprising a first ramp section and a second ramp section, a second input terminal that receives a pixel signal, and an output terminal that provides an output signal; and a comparing circuit connected between the first and second input terminals and the output terminal, receiving a dithering enable signal, and configured to compare the ramp signal with the pixel signal to generate the output signal, wherein the comparing circuit is further configured to change a point in time at which the output signal logically transitions during the first ramp section and the second ramp section in response to the dithering enable signal.