Pixel signal processing apparatus and cmos image sensor using the same
AssigneeSK hynix Inc.
InventorYoung-Chul SOHN
Life of this patent
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Abstract
A CMOS image sensor may include an active pixel sensor suitable for generating a pixel signal corresponding to incident light, a reference pixel array suitable for shielding incident light and generate a reference value, a readout circuit suitable for comparing the pixel signal and the reference value with a ramp signal and for removing a first noise of the pixel signal in a common mode, and a pixel signal processing circuit suitable for performing a linear operation on an output signal from the readout circuit and the reference value, and for removing a second noise of the pixel signal in the common mode.
Claims13
A CMOS image sensor comprising:
- an active pixel sensor suitable for generating a pixel signal corresponding to incident light;
- a reference pixel array suitable for shielding incident light and generate a reference value;
- a readout circuit suitable for comparing the pixel signal and the reference value with a ramp signal and for removing a first noise of the pixel signal in a common mode;
- and
- a pixel signal processing circuit suitable for performing a linear operation on an output signal from the readout circuit and the reference value and for removing a second noise of the pixel signal in the common mode.
A pixel signal processing apparatus comprising:
- a demultiplexing unit suitable for demultiplexing a signal including a pixel signal and a first reference value and a second reference value;
- a first calculation unit suitable for calculating a difference between the first reference value and the second reference value;
- and
- a second calculation unit suitable for applying a weight to the pixel signal based on the difference between the first reference value and the second reference value and for calculating a difference between the pixel signal and the difference between the first reference value and the second reference value.
Dependencies are inferred from the claim text.