Patent ID: 8890742

Claim:
An imaging device, comprising: a first digital to analog converter to provide a first reference signal to a comparator, a second digital to analog converter to provide a second reference signal to said comparator, and a first pixel in a pixel array to provide a pixel output signal to said comparator; said comparator comprising an output terminal operatively connected to a first input terminal of a first counter and a first input terminal of a second counter; said first counter comprising a second input terminal to receive a first clock count signal, a third input terminal to receive a first control signal, and a output terminal operatively connected to a memory device; and said second counter comprising a second input terminal to receive a second clock count signal, a third input terminal to receive a second control signal, and a output terminal operatively connected to said memory device, wherein the comparator is configured to compare the pixel output signal to the second reference signal that is configured to ramp plural through a coarse conversion operating level.