Correlated double sampling circuit and image sensor including the same

An image sensor comprising:

• a pixel array including a plurality of pixels configured to convert an optical signal into an electrical signal;
• a correlated double sampling (CDS) circuit configured to perform CDS on an image pixel signal and a reset signal output from each of pixels disposed in a first region of the pixel array;
• and
• a flicker detection circuit configured to perform flicker detection based on a flicker pixel signal and a reset signal output from each of pixels disposed in a second region of the pixel array.

An image sensor comprising:

• a pixel array having a first plurality of pixels with a first plurality of outputs for a first plurality of electrical image signals, and a second plurality of pixels with at least one second output for at least one electrical flicker signal;
• a first correlated double sampling (CDS) circuit connected to the first plurality of outputs;
• a first analog-to-digital converter (ADC) connected to the first CDS circuit;
• and
• a flicker detection circuit connected to the at least one second output and having a second CDS circuit and a second ADC connected to the second CDS circuit.