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Image sensor power supply rejection ratio noise reduction through ramp generator

A slope generator and image sensor technology, applied in image communication, television, electrical components, etc., can solve problems such as unsatisfactory

Active Publication Date: 2016-10-26
OMNIVISION TECH INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Undesirable power supply rejection ratios can present many challenges, including noise from the power supply that can enter the output signal path
In addition, ripples in the power supply can cause unwanted horizontal ripples in the captured image

Method used

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  • Image sensor power supply rejection ratio noise reduction through ramp generator
  • Image sensor power supply rejection ratio noise reduction through ramp generator
  • Image sensor power supply rejection ratio noise reduction through ramp generator

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Embodiment Construction

[0012] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the specific details need not be employed to practice the invention. In other instances, well-known materials or methods have not been described in detail in order not to obscure the present invention.

[0013] Reference throughout this specification to "one embodiment," "an embodiment," "an example," or "an example" means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one aspect of the invention. In one embodiment. Thus, appearances of the phrases "in one embodiment," "in an embodiment," "an instance," or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or instance. Furthermore, particular features, structures or c...

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Abstract

The application relates to an image sensor power supply rejection ratio noise reduction through ramp generator. A ramp generator includes a supply voltage sampling circuit coupled to sample a black signal supply voltage during a black signal readout, and an image signal supply voltage of the pixel cell during an image signal readout of a pixel cell. A first integrator circuit receives a buffered reference voltage, and an output of the supply voltage sampling circuit. First and second switches are coupled between the first integrator circuit and a first capacitor to transfer a signal representative of a difference between the image signal supply voltage and the black signal supply voltage to the first capacitor. A second integrator circuit is coupled to the first capacitor to generate an output ramp signal coupled to be received by an analog to digital converter. A starting value of the output ramp signal is adjusted in response to the difference between the image signal and the black signal supply voltage.

Description

technical field [0001] The present invention generally relates to image sensors. More particularly, examples of the invention relate to circuitry for reading out image data from image sensor pixel cells. Background technique [0002] Image sensors have become ubiquitous. They are widely used in digital cameras, cellular phones, security cameras, as well as in medical, automotive and other applications. The technology for fabricating image sensors, and in particular complementary metal-oxide-semiconductor (COMS) image sensors, has continued to advance at a rapid rate. For example, demands for higher resolution and lower power consumption have driven further miniaturization and integration of CMOS image sensors. [0003] In a conventional CMOS active pixel sensor, image charge is transferred from a photosensitive device (eg, a photodiode) and converted to a voltage signal inside the pixel cell on a floating diffusion node. In a conventional CMOS image sensor, an amplifier ...

Claims

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Application Information

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IPC IPC(8): H04N5/3745H04N5/378
CPCH04N25/77H04N25/75H04N25/617H04N25/60
Inventor 袁碧金秋峰邓黎平左亮
Owner OMNIVISION TECH INC
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