Line memory device and image sensor including the same
First Claim
1. A line memory device, comprising:
- a plurality of memory cells each configured to store a respective different memory data bit from among memory data bits;
a sense amplifier;
a data line pair coupled to the memory cells and to the sense amplifier to sequentially transfer the memory data bits from the memory cells to the sense amplifier, wherein each of the plurality of memory cells is disposed a corresponding different distance from the sense amplifier along the data line pair such that the memory data bits are transferred from the memory cells to the sense amplifier with delays that are different from each other, and wherein a first one of the memory cells is a farthest distance among the memory cells from the sense amplifier along the data line pair and stores a first data bit from among the memory data bits which is transferred to the sense amplifier with a longest delay among the delays; and
an output unit configured to sample an output of the sense amplifier for each of the memory data bits in response to a read clock signal so as to sequentially output retimed data bits each corresponding to a respective different one of the memory data bits,wherein the read clock signal has a cyclic period which is less than the longest delay.
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Abstract
A line memory device includes a plurality of memory cells, a data line pair, a sense amplifier and an output unit. The plurality of memory cells are disposed adjacent to each other in a line. The data line pair is coupled to the memory cells to sequentially transfer memory data bits stored in the memory cells to the sense amplifier. The sense amplifier is configured to amplify the memory data bits that are sequentially transferred through the data line pair by corresponding delay times which are different from each other. The output unit samples an output of the sense amplifier to sequentially output retimed data bits of the memory data bits in response to a read clock signal. The read clock signal has a cyclic period which is less than a maximum delay time among the delay times.
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Citations
20 Claims
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1. A line memory device, comprising:
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a plurality of memory cells each configured to store a respective different memory data bit from among memory data bits; a sense amplifier; a data line pair coupled to the memory cells and to the sense amplifier to sequentially transfer the memory data bits from the memory cells to the sense amplifier, wherein each of the plurality of memory cells is disposed a corresponding different distance from the sense amplifier along the data line pair such that the memory data bits are transferred from the memory cells to the sense amplifier with delays that are different from each other, and wherein a first one of the memory cells is a farthest distance among the memory cells from the sense amplifier along the data line pair and stores a first data bit from among the memory data bits which is transferred to the sense amplifier with a longest delay among the delays; and an output unit configured to sample an output of the sense amplifier for each of the memory data bits in response to a read clock signal so as to sequentially output retimed data bits each corresponding to a respective different one of the memory data bits, wherein the read clock signal has a cyclic period which is less than the longest delay. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An image sensor comprising:
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a pixel array including a plurality of pixels configured to capture an image; an analog-to-digital convertor block configured to convert analog signals from the pixels to digital signals; and a line memory device configured to buffer the digital signals as memory data bits, the line memory device comprising a plurality of memory cells each configured to store a respective different memory data bit from among the memory data bits; a sense amplifier; a data line pair coupled to the memory cells and to the sense amplifier to sequentially transfer the memory data bits from the memory cells to the sense amplifier, wherein each of the plurality of memory cells is disposed a corresponding different distance from the sense amplifier along the data line pair such that the memory data bits are transferred from the memory cells to the sense amplifier with delays that are different from each other, and wherein a first one of the memory cells is a farthest distance among the memory cells from the sense amplifier along the data line pair and stores a first data bit from among the memory data bits which is transferred to the sense amplifier with a longest delay among the delays; and an output unit configured to sample an output of the sense amplifier for each of the memory data bits in response to a read clock signal so as to sequentially output retimed data bits each corresponding to a respective different one of the memory data bits, wherein the read clock signal has a cyclic period which is less than the longest delay. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A line memory device, comprising:
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a plurality of memory cells each configured to store a respective different memory data bit from among memory data bits; a sense amplifier; a data line pair coupled to the memory cells and to the sense amplifier to sequentially transfer the memory data bits from the memory cells to the sense amplifier, wherein each of the plurality of memory cells is disposed a corresponding different distance from the sense amplifier along the data line pair such that the memory data bits are transferred from the memory cells to the sense amplifier with delays that are different from each other; and an output unit configured to sample an output of the sense amplifier for each of the memory data bits in response to a read clock signal so as to sequentially output retimed data bits each corresponding to a respective different one of the memory data bits in response to a retiming selection signal, wherein the output unit comprises a plurality of dummy memory cells, a dummy sense amplifier, a dummy data line pair, and a detection signal generator, wherein the detection signal generator is configured to generate a detection signal by comparing first detection bits and second detection bits sampled from an output of the dummy sense amplifier, and the output unit is configured to generate the retiming selection signal based on the detection signal. - View Dependent Claims (20)
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Specification