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Analog-to-digital converter, image sensor and operating method thereof

An image sensor and pixel technology, applied in the field of image sensors, can solve problems such as the space burden occupied by image sensors

Pending Publication Date: 2022-04-15
SK HYNIX INC
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Problems solved by technology

[0005] The indirect method requires an analog-to-digital converter for the analog-to-digital conversion of the tap-A pixel signal and an analog-to-digital converter for the analog-to-digital conversion of the tap-B pixel signal, respectively, which constitutes a challenge in terms of the space to be occupied in the image sensor for the indirect method burden

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  • Analog-to-digital converter, image sensor and operating method thereof
  • Analog-to-digital converter, image sensor and operating method thereof
  • Analog-to-digital converter, image sensor and operating method thereof

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Embodiment Construction

[0016] Hereinafter, various embodiments of the present disclosure will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily practice the technical spirit of the present invention. Well-known components or elements not related to the subject matter of the present disclosure may be omitted from the description. Throughout the specification and drawings, the same or substantially the same reference numerals are used to refer to the same or substantially the same elements.

[0017] figure 1 is a diagram illustrating the configuration of the image sensor 100 according to the embodiment of the present invention.

[0018] refer to figure 1 , the image sensor 100 may include a first-tap pixel 110 , a second-tap pixel 120 , a pixel signal generator 130 , an operational amplifier 140 , a counting circuit 150 , capacitors 141 and 142 , and switches 143 and 144 .

[0019] The pixels 110 of the first tap may detect ligh...

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Abstract

The invention relates to an analog-to-digital converter, an image sensor and an operation method thereof. The image sensor includes: a pixel of a first tap; a pixel of a second tap; an operational amplifier configured to perform an automatic zeroing operation in a case where a pixel signal of a pixel of the second tap is applied, and perform a comparison operation between a pixel signal output from a pixel of the first tap and a ramp voltage in a case where a pixel signal of a pixel of the first tap is applied; and a counting circuit configured to generate a digital code in response to an output of the operational amplifier.

Description

technical field [0001] The present disclosure relates to an image sensor. Background technique [0002] Image sensors that provide 3D distance images by simultaneously measuring a range of distances are being developed recently. Acquiring such range images is based on time-of-flight (TOF) techniques. The technology measures distance by measuring the time it takes light to travel back and forth between a light source near the image sensor and an object. [0003] TOF technology is roughly divided into two methods: direct method and indirect method. The direct method converts the time required for the round trip of pulsed light to distance. In order to improve the accuracy, the direct method needs to make the pulse width as narrow as possible considering the speed of light. Furthermore, direct methods require very precise time measurements. [0004] On the other hand, the indirect method is implemented to extract the distance by radiating modulated light and then receiving...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/369G01S7/4861G01S17/08G01S17/894
CPCG01S7/4863G01S7/4865G01S17/89H03M1/56H04N25/778H04N25/77H04N25/771H04N25/772H04N25/78H04N25/59H04N25/75H04N25/53G01S7/4914G01S7/4915G01S17/36G01S17/894H01L27/14612H03M1/182H03M1/34
Inventor 宋贞恩朴儒珍徐成旭申旼锡
Owner SK HYNIX INC
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