Analog-to-digital converter and CMOS image sensor including the same

An analog-to-digital converter, comprising:

• a correlated double sampling (CDS) array,
• wherein the CDS array includes a CDS circuit at each column, and
• wherein the CDS circuit includes:
• a dummy sampling signal generation unit suitable for generating a dummy sampling signal, which is sampled from a dummy pixel signal outputted from a dummy pixel array by using a correlated double sampling;
• an active sampling signal generation unit suitable for generating an active sampling signal, which is sampled from an active pixel signal outputted from an active pixel array by using a correlated double sampling;
• and
• a comparison unit suitable for comparing the dummy sampling signal with the active sampling signal.

A CMOS image sensor, comprising:

• an active pixel array suitable for generating an active pixel signal;
• a dummy pixel array suitable for generating a dummy pixel signal;
• a row driver suitable for controlling the active pixel array and the dummy pixel array to simultaneously operate at a same column;
• and
• a correlated double sampling (CDS) array suitable for generating an active sampling signal and a dummy sampling signal, which are sampled from the active pixel signal and the dummy pixel signal by using a correlated double sampling, respectively, based on a first ramp signal and a second ramp signal, and comparing the active sampling signal with the dummy sampling signal.

A CMOS image sensor, comprising:

• an active pixel array suitable for generating an active pixel signal;
• a dummy pixel array suitable for generating a dummy pixel signal;
• a row driver suitable for controlling the active pixel array and the dummy pixel array to simultaneously operate at a same column;
• and
• a correlated double sampling (CDS) array suitable for generating an active sampling signal and a dummy sampling signal, which are sampled from the active pixel signal and the dummy pixel signal by using a correlated double sampling, respectively, and comparing the active sampling signal with the dummy sampling signal.

A CMOS image sensor, comprising:

• an active pixel array suitable for generating an active pixel signal;
• a dummy pixel array suitable for generating a dummy pixel signal, wherein the dummy pixel array includes dummy pixels corresponding one to one to active pixels included in the active pixel array at each column;
• a row driver suitable for controlling the active pixel array and the dummy pixel array to simultaneously operate at a same column;
• and
• a correlated double sampling (CDS) array suitable for generating an active sampling signal and a dummy sampling signal, which are sampled from the active pixel signal and the dummy pixel signal by using a correlated double sampling.