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Switching techniques for fast voltage stabilization in image sensors

An image sensor, voltage technology, applied in the field of image sensor, can solve the problem of signal noise increase

Active Publication Date: 2022-04-12
OMNIVISION TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the increased frequency of pixel readout results in increased signal noise

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  • Switching techniques for fast voltage stabilization in image sensors
  • Switching techniques for fast voltage stabilization in image sensors
  • Switching techniques for fast voltage stabilization in image sensors

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Embodiment Construction

[0017] An image sensor is disclosed that has reduced noise during data transmission and thus results in faster stabilization of the pixels of the image sensor. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the embodiments. One skilled in the relevant art will recognize, however, that the techniques described herein may be practiced without employing one or more of these specific details, or with other methods, components, materials, etc. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring certain aspects.

[0018] Reference throughout this specification to "one example" or "one embodiment" means that a particular feature, structure, or characteristic described in connection with the example is included in at least one example of the present invention. Thus, appearances of the phrase "in one example" or "in one embodiment" in various p...

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Abstract

This disclosure describes switching techniques for fast voltage stabilization in image sensors. In one embodiment, a transfer gate (TX) driver circuit of an image sensor includes a TX driver configured to provide a TX driver voltage to a plurality of pixels of the image sensor. A power supply (NVDD) is operably coupled to the TX driver. A first switch (SW1) operably couples an external capacitance (Cext) and the TX driver. A second switch (SW2) is operably coupled to the Cext and the NVDD. A third switch (SW3) is operably coupled to the NVDD and the TX driver. A falling edge of the TX driver voltage is configured to control initiation of data transfer from individual pixels of the plurality of pixels. The SW1 and the SW2 are configured in an off position prior to the falling edge of the TX driver voltage. The SW3 is configured in a closed position prior to the falling edge.

Description

technical field [0001] The present disclosure relates generally to image sensors, and in particular to voltage stabilization and noise control during data transmission in CMOS image sensors. Background technique [0002] Image sensors have become ubiquitous. They are widely used in digital still cameras, cellular phones, and surveillance cameras, as well as in medical, automotive, and other applications. Technology for manufacturing image sensors continues to advance rapidly. For example, the demand for higher image sensor resolution and lower power consumption stimulates further miniaturization and integration of image sensors into digital devices. [0003] In general, higher sensor resolutions require faster pixel readouts to maintain the same frame rate by increasing the frequency of pixel readouts. However, an increase in the frequency of pixel readout results in increased signal noise. Therefore, there is a need for systems and methods for reducing signal noise. C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/3745H04N5/378H01L27/146
CPCH04N25/40H04N25/78H04N25/77H04N25/7795H04N25/779H01L27/14612H04N25/75H04N25/709
Inventor 代铁军高哲傅玲
Owner OMNIVISION TECH INC