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Analog-to-digital converter and analog-to-digital conversion method

a converter and digital converter technology, applied in the field of image sensors, can solve the problems of increasing the consumption of power, and achieve the effects of reducing standby power consumption, reducing noise, and increasing data processing speed

Active Publication Date: 2018-07-05
SK HYNIX INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes an analog-to-digital converter and method that can reduce noise when extracting pixel signals, increase data processing speed, and minimize standby power consumption by reducing the time required for data conversion. Additionally, it can reduce counter power consumption by reducing the number of counting operations.

Problems solved by technology

Therefore, noise caused by counting and power noise caused by an increase in the consumed power may be increased, thereby causing a concern during a data conversion process.

Method used

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Embodiment Construction

[0024]Various embodiments will be described below in more detail with reference to the accompanying drawings. The present disclosure may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art. Throughout the disclosure, like reference numerals refer to like parts throughout the various figures and embodiments of the present disclosure.

[0025]It will be further understood that when an element is referred to as being “connected to”, or “coupled to” another element, it may be directly on, connected to, or coupled to the other element, or one or more intervening elements may be present. In addition, it will also be understood that when an element is referred to as being “between” two elements, it may be the only element between the two elements, or o...

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Abstract

An analog-to-digital conversion method may include: generating an initial comparison signal by storing adjacent pixel signals and comparing the adjacent pixel signals, and generating a first control signal based on the generated initial comparison signal; generating a reference comparison signal by comparing the adjacent pixel signals based on the reference signal and a ramp-up signal switched according to the generated first control signal, and determining a ramping direction according to the generated reference comparison signal and generating a second control signal; and performing data conversion by selecting any one of the ramp-up signal and a ramp-down signal according to the generated second control signal, and by comparing the selected ramp signal with a ‘difference value between the adjacent pixel signals’.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims priority under 35 U.S.C. § 119 to Korean Patent Application No. 10-2016-0182205 filed on Dec. 29, 2016 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety.TECHNICAL FIELD[0002]Exemplary embodiments relate to an image sensor, and more particularly, a complementary metal oxide semiconductor (CMOS) image sensor (CIS) including an analog-to-digital converter.DISCUSSION OF THE RELATED ART[0003]Generally, CMOS image sensors (CISs) which are embodied through CMOS processes are expanding rapidly into markets due to advantages of low power consumption, low cost and a small size compared to other competitive products. Particularly, as the image quality of CISs which has been relatively insufficient compared to that of competitive products is improved, their application field is widening to include video applications requiring both a high resolution and a high...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04N5/357H04N5/369H03M1/38H03M1/12
CPCH04N5/3575H04N5/3698H04N5/37455H03M1/1245H03M1/38H03M1/14H03M1/56H04N25/78H04N25/616H04N25/77H04N25/75H04N25/709H04N25/772
Inventor KIM, TAE-GYU
Owner SK HYNIX INC