ANALOG-TO-DIGITAL CONVERTER AND CMOS IMAGE SENSOR INCLUDING THE SAME

摘要

A CMOS image sensor includes 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.

主权项

1. An analog-to-digital converter, comprising:
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, based on a first ramp signal; 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, based on a second ramp signal; and a comparison unit suitable for comparing the dummy sampling signal with the active sampling signal.