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US 2007/0182838 A1Published application
Offset correction during correlated double sampling in CMOS image sensor
AssigneeSamsung Electronics Co., Ltd.
InventorKwang-Hyun Lee
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Abstract
For correlated double sampling in an image sensor, a comparator receives and compares a reset signal and a sensing signal from a pixel of the image sensor. Also, a controller adjusts a voltage at a controlled input of the comparator to compensate for offset of the comparator from feed-back of an output of the comparator. The controller includes at least one charging current source and at least one discharging current source that are controlled to adjust such a voltage.
Claims20
An apparatus for correlated double sampling in an image sensor, comprising:
- a comparator for receiving and comparing a reset signal and a sensing signal from a pixel of the image sensor;
- and
- a controller for adjusting a voltage at a controlled input of the comparator to compensate for offset of the comparator from feed-back of an output of the comparator.
A method of correlated double sampling in an image sensor, comprising:
- comparing a reset signal and a sensing signal from a pixel of the image sensor, the reset and sensing signals being applied at inputs of a comparator;
- and
- adjusting a voltage at a controlled input of the comparator to compensate for offset of the comparator from feed-back of an output of the comparator.
Dependencies are inferred from the claim text.