Correlated double sampling circuit and image sensor including the same
AssigneeSamsung Electronics Co., Ltd.
InventorsSangpil Nam, Kyunghoon Lee, Jungho Lee, Youngjae Cho, Michael Choi
Life of this patent
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Abstract
A flicker detection circuit is provided. The flicker detection circuit may include a flicker detection correlated double sampling (FD CDS) circuit including first to sixth switches turned on or off based on a control signal, and first to fourth capacitors, the FD CDS circuit being configured to receive a flicker pixel signal output from at least one pixel, summate with an output offset signal, and amplify the summation based on a gain to form a flicker detection signal; and an analog-to-digital converter (ADC) configured to quantize the flicker detection signal.
Claims20
A flicker detection circuit comprising:
- a flicker detection correlated double sampling (FD CDS) circuit including first to sixth switches turned on or off based on a control signal, and first to fourth capacitors, the FD CDS circuit being configured to receive a flicker pixel signal output from at least one pixel, summate with an output offset signal, and amplify the summation based on a gain to form a flicker detection signal;
- and
- an analog-to-digital converter (ADC) configured to quantize the flicker detection signal.
An image sensor comprising:
- a pixel array including a plurality of pixels configured to convert an optical signal into an electrical signal;
- a correlated double sampling (CDS) circuit configured to perform CDS on an image pixel signal and a reset signal output from each of pixels disposed in a first region of the pixel array;
- and
- a flicker detection circuit configured to perform flicker detection based on a flicker pixel signal and a reset signal output from each of pixels disposed in a second region of the pixel array,
- wherein the flicker detection circuit comprises a sampling circuit including first to sixth switches turned on or off based on a control signal, first to fourth capacitors, and an amplifier amplifying a flicker pixel signal output from the pixel based on a gain and a signal summating the flicker pixel signal and an output offset.
An image sensor comprising:
- a pixel array having a first plurality of pixels with a first plurality of outputs for a first plurality of electrical image signals, and a second plurality of pixels with at least one second output for at least one electrical flicker signal;
- a first correlated double sampling (CDS) circuit connected to the first plurality of outputs;
- a first analog-to-digital converter (ADC) connected to the first CDS circuit;
- and
- a flicker detection circuit connected to the at least one second output and having a second CDS circuit and a second ADC connected to the second CDS circuit,
- wherein the flicker detection circuit comprises an amplifier amplifying the at least one second output based on a gain and a signal summating the at least one electrical flicker signal and an output offset.
Dependencies are inferred from the claim text.