IMAGE SENSOR INCLUDING HETEROGENEOUS ANALOG TO DIGITAL CONVERTERS

摘要

An image sensor according to an embodiment of the present invention comprises: a pixel sensor array including an active pixel sensor and an optical black pixel sensor; a first analog to digital converter converting a first sensing signal, provided from the active pixel sensor, into a first digital signal; a second analog to digital converter converting a second sensing signal, provided from the optical black pixel sensor, into a second digital signal and having a noise characteristic different from the first analog to digital converter; and an output buffer buffering and outputting the first digital signal and the second digital signal.