Correlated-double-sampling (CDS) with amplification in image sensing device
First Claim
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1. A correlated double sampling (CDS) amplifier, comprising:
- a plurality of capacitors; and
a switching network coupled to the plurality of capacitors and to a pixel of an image sensing device;
wherein the switching network is configured to couple the capacitors in parallel as an initial CDS difference voltage is generated, and then is configured to couple the capacitors in series for generating a final CDS difference voltage that is a multiple of the initial CDS difference voltage,and wherein the initial and final CDS difference voltages are determined for a signal sampling from said one pixel of the image sensing device,and wherein the initial CDS difference voltage is a difference between a reset voltage and an image signal voltage for the pixel.
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Abstract
A correlated double sampling (CDS) amplifier for an image sensing device includes a plurality of capacitors and a switching network coupled to the plurality of capacitors and to a pixel of the image sensing device. The switching network is configured to couple the capacitors in parallel as an initial CDS difference voltage is generated, and then is configured to couple the capacitors in series for generating a final CDS difference voltage that is a multiple of the initial CDS difference voltage.
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Citations
17 Claims
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1. A correlated double sampling (CDS) amplifier, comprising:
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a plurality of capacitors; and a switching network coupled to the plurality of capacitors and to a pixel of an image sensing device; wherein the switching network is configured to couple the capacitors in parallel as an initial CDS difference voltage is generated, and then is configured to couple the capacitors in series for generating a final CDS difference voltage that is a multiple of the initial CDS difference voltage, and wherein the initial and final CDS difference voltages are determined for a signal sampling from said one pixel of the image sensing device, and wherein the initial CDS difference voltage is a difference between a reset voltage and an image signal voltage for the pixel. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An image sensing device, comprising:
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a pixel for generating a reset voltage and an image signal voltage; a correlated double sampling (CDS) amplifier for generating an initial CDS difference voltage from the reset voltage and the image signal voltage, and for generating a final CDS difference voltage that is a multiple of the initial CDS difference voltage, and wherein the initial and final CDS difference voltages are determined for a signal sampling from said one pixel of the image sensing device; and an analog-to-digital converter for converting the final CDS difference voltage that is an analog signal into a digital signal, wherein the CDS amplifier includes; a plurality of capacitors; and a switching network coupled to the plurality of capacitors and to the pixel; and wherein the image sensing device further includes; a controller for configuring the switching network to couple the capacitors in parallel as the initial CDS difference voltage is generated, and then to couple the capacitors in series for generating the final CDS difference voltage. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method for correlated double sampling (CDS) within an image sensing device, comprising:
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configuring a switching network to couple respective capacitors within each of a plurality of sets in parallel as an initial CDS difference voltage is generated for a pixel; and configuring the switching network to couple the respective capacitors within each of the sets in series for generating a final CDS difference voltage that is a multiple of the initial CDS difference voltage, and wherein the initial and final CDS difference voltages are determined for a signal sampling from said one pixel of the image sensing device, and wherein the initial CDS difference voltage is a difference between a reset voltage and an image signal voltage for the pixel. - View Dependent Claims (15, 16, 17)
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Specification