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Pixel circuit and image sensing system

A technology of pixel circuit and image charge, which is applied to the parts of TV system, image communication, TV, etc., and can solve the problem of the reduction of the output signal range of the image sensor amplifier circuit.

Active Publication Date: 2018-08-07
OMNIVISION TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the output signal range of the image sensor amplifier circuit may be reduced due to reset switch charge injection and clock feedthrough to the input node when the pixel circuit reset switch is turned off.

Method used

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  • Pixel circuit and image sensing system

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Embodiment Construction

[0011] 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 one or more of the 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 the particular aspect.

[0012] Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or ch...

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PUM

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Abstract

The invention relates to a pixel circuit and an imaging sensing system. The pixel circuit includes a photodiode, and a transfer transistor coupled to the photodiode. A floating diffusion is coupled tothe transfer transistor coupled to transfer image charge from the photodiode to the floating diffusion. An amplifier circuit includes an input coupled to the floating diffusion, an output coupled togenerate an image data signal of the pixel circuit, and a variable bias terminal coupled to receive a variable bias signal. A reset switch is coupled between the output and input of the amplifier circuit to reset the amplifier circuit in response to a reset signal. A variable bias generator circuit is coupled to generate the variable bias signal in response to a reset signal to transition the variable bias signal from a first bias signal value to a second bias signal value in response to a transition of the reset signal from an active state to an inactive state.

Description

technical field [0001] This disclosure relates generally to imaging systems, and more particularly to image sensor amplifiers. Background technique [0002] Image sensors have become ubiquitous. It is 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 complementary metal-oxide-semiconductor (CMOS) image sensors in particular, has continued to advance rapidly. For example, requirements for higher resolution and lower power consumption have prompted further miniaturization and integration of these image sensors. [0003] In a conventional CMOS image sensor, a pixel circuit is usually combined with an amplifier circuit to generate an image data output signal. Designers typically try to implement amplifier circuits with high charge-to-voltage conversion rates, with relatively little reference noise due to back-end readout circuitry. These efforts are be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/374H04N5/378H04N5/335H04N25/00
CPCH04N25/00H04N25/76H04N25/75H03F1/0261H03F1/223H03F3/082H04N25/57H04N25/77
Inventor 邓黎平杨征汤俊明代铁军
Owner OMNIVISION TECH INC