Image sensor for improving linearity of analog-to-digital converter and image processing system including the same
First Claim
1. An image sensor comprising:
- a pixel array comprising a plurality of pixels, each pixel of the plurality of pixels being connected to one of first through m-th column lines to output a pixel signal, where “
m”
is an integer of at least 2;
a plurality of analog-to-digital converters, each analog-to-digital converter of the plurality of analog-to-digital converters being configured to receive the pixel signal corresponding to one of the first through m-th column lines, to compare the pixel signal with a ramp signal, and to convert the pixel signal to a digital pixel signal;
a ramp signal generator configured to generate the ramp signal; and
a ramp signal buffer configured to buffer and output the ramp signal; and
a blocking circuit connected between the ramp signal buffer and an input terminal of at least one analog-to-digital converter of the plurality of analog-to-digital converters to block an influence of an operation of other analog-to-digital converters among the plurality of analog-to-digital converters.
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Accused Products
Abstract
An image sensor and an image processing system including the same are provided. The image sensor includes a pixel array including a plurality of pixels each connected to one of first through m-th column lines to output a pixel signal, where “m” is an integer of at least 2; analog-to-digital converters each configured to receive the pixel signal corresponding to one of the first through m-th column lines, to compare the pixel signal with a ramp signal, and to convert the pixel signal to a digital pixel signal; and a blocking circuit connected to an input terminal of at least one of the analog-to-digital converters to block an influence of an operation of others among the analog-to-digital converters.
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Citations
19 Claims
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1. An image sensor comprising:
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a pixel array comprising a plurality of pixels, each pixel of the plurality of pixels being connected to one of first through m-th column lines to output a pixel signal, where “
m”
is an integer of at least 2;a plurality of analog-to-digital converters, each analog-to-digital converter of the plurality of analog-to-digital converters being configured to receive the pixel signal corresponding to one of the first through m-th column lines, to compare the pixel signal with a ramp signal, and to convert the pixel signal to a digital pixel signal; a ramp signal generator configured to generate the ramp signal; and a ramp signal buffer configured to buffer and output the ramp signal; and a blocking circuit connected between the ramp signal buffer and an input terminal of at least one analog-to-digital converter of the plurality of analog-to-digital converters to block an influence of an operation of other analog-to-digital converters among the plurality of analog-to-digital converters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An image sensor comprising:
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a pixel array comprising a plurality of pixels, each pixel of the plurality of pixels being connected to one of first through m-th column lines to output a pixel signal, where “
m”
is an integer of at least 2;a ramp signal generator configured to generate a ramp signal; a ramp signal buffer configured to buffer and output the ramp signal; a plurality of comparators, each comparator of the plurality of comparators being configured to receive a pixel signal of the pixel signals which corresponds to one of the first through m-th column lines, to compare the pixel signal with the ramp signal, and to generate a comparison signal; a plurality of counters each configured to generate a digital signal according to the comparison signal; and a blocking circuit connected between an output terminal of the ramp signal buffer and an input terminal of at least one comparator of the plurality of comparators, wherein each comparator of the plurality of comparators receives the ramp signal through the blocking circuit and compares the ramp signal with the pixel signal. - View Dependent Claims (10, 11)
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12. An image sensor comprising:
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a ramp signal generator that comprises an output buffer and is configured to generate a ramp signal; a plurality of analog-to-digital converters, each analog-to-digital converter of the plurality of analog-to-digital converters being configured to receive a pixel signal, to compare the pixel signal with the ramp signal, and to convert the pixel signal to a digital pixel signal; and a blocking circuit connected between the ramp signal generator and the plurality of analog-to-digital converters. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification