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Ramp signal generation device and CMOS image sensor including the same

A technology for generating devices and ramp signals, which can be used in image communication, pulse generation, color TV components, etc., and can solve problems such as difficult to implement ramp signal generating devices

Active Publication Date: 2019-09-24
SK HYNIX INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the resolution of CMOS image sensors increases, it is difficult to implement a ramp signal generating device with the above structure

Method used

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  • Ramp signal generation device and CMOS image sensor including the same
  • Ramp signal generation device and CMOS image sensor including the same
  • Ramp signal generation device and CMOS image sensor including the same

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Embodiment Construction

[0016] Hereinafter, various embodiments will be described in more detail with reference to the accompanying drawings. However, this disclosure may be embodied in different forms and therefore 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 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. Additionally, throughout this specification, references to "an embodiment," "another embodiment," etc. are not necessarily to the same embodiment, and different references to any such phrase are not necessarily to the same embodiment.

[0017] It will be understood that when an element is referred to as being "coupled to" another element, it can be directly coupled to the element or electrically coupled t...

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Abstract

A ramp signal generation device includes a sampling circuit suitable for sampling a ramp current, which flows on a plurality of ramp current paths, and storing a voltage corresponding to the sampled ramp current; a current maintaining circuit suitable for maintaining the ramp current; a current maintaining / transferring circuit suitable for maintaining and transferring a current corresponding to the voltage stored by the sampling circuit; a selection circuit suitable for selecting a ramp current path of the sampling block and the current maintaining / transferring circuit; and a current-to-voltage converter suitable for converting the current transferred from the current maintaining / transferring circuit and generating therefrom a ramp voltage.

Description

technical field [0001] Various embodiments of the invention relate to complementary metal oxide semiconductor (CMOS) image sensors. Specifically, embodiments of the present disclosure relate to a ramp signal generating device for reducing a ramp current range. Background technique [0002] Recently, CMOS image sensors having a high frame rate and high density have been manufactured. A single-slope analog-to-digital conversion device (SS-ADC) may be used in a CMOS image sensor. [0003] A CMOS image sensor using the SS-ADC may include a ramp signal generating means implemented using a current-steering digital-to-analog converting means. In this configuration, the gain of the CMOS image sensor can be adjusted using a current amount adjustment technique. [0004] The ramp signal generating means generates a ramp signal having a ramp voltage corresponding to the ramp current by replicating a ramp current using a transistor and transferring the replicated ramp current to a ram...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/374H04N5/3745H04N5/378
CPCH04N25/76H04N25/78H03M1/56H03K4/023H03M1/123H04N25/59H04N25/766H03K4/02H01L27/14612H01L27/14643H04N25/75H04N25/772
Inventor 金泰逵
Owner SK HYNIX INC
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