ANALOG-TO-DIGITAL CONVERTER FOR IMAGE PIXELS

摘要

One or more analog-to-digital converters and methods for analog-to-digital conversion are provided. The analog-to-digital converter comprises a ramp generator and a direct current (DC) generator respectively configured to apply a ramp voltage waveform and a DC voltage waveform to a comparator. During a pixel signal level conversion, a first portion of the ramp voltage waveform is applied to the comparator. A control circuit then makes a determination regarding an output of the comparator. If the output corresponds to a first output, or first logic state, the ramp voltage generator applies a second portion of the ramp voltage waveform to the comparator. If the output corresponds to a second output, or second logic state, the DC generator adjusts the DC voltage waveform applied to the comparator.

主权项

1. A method for analog-to-digital conversion, comprising:
applying a first portion of a ramp voltage waveform to a comparator; making a first determination regarding an output of the comparator responsive to the applying a first portion of a ramp voltage waveform; when, based upon the first determination, the output corresponds to a first output:
applying a second portion of the ramp voltage waveform to the comparator; and when, based upon the first determination, the output corresponds to a second output different than the first output:
adjusting a voltage of a direct current (DC) voltage waveform applied to the comparator.