Photoelectric conversion apparatus and image pickup system

摘要

A photoelectric conversion apparatus includes a plurality of pixels provided in a plurality of columns, a plurality of analog-to-digital conversion units each provided for a corresponding one of the plurality of columns, and a correction unit. Each of the plurality of analog-to-digital conversion units is configured to convert a signal of a corresponding one of the plurality of pixels into a digital signal at a resolution corresponding to a magnitude of the signal. The correction unit is configured to correct a difference in the resolution.

主权项

1. A photoelectric conversion apparatus comprising:
a plurality of pixels provided in a plurality of columns; a reference signal generating unit configured to generate a first reference signal and a second reference signal, the first reference signal having a first changing rate with respect to time, and the second reference signal having a second changing rate with respect to time, wherein the first changing rate is smaller than the second changing rate; a plurality of analog-to-digital conversion units each provided for a corresponding one of the plurality of columns, each of the plurality of analog-to-digital conversion units being configured to convert a signal output from a corresponding pixel of the plurality of pixels into a digital signal by comparing the signal and one of the first reference signal and the second reference signal; and a correction unit configured to correct the digital signal based on an error in comparison to an ideal ratio of the first changing rate and the second changing rate.