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High Speed ​​Global Shutter Image Sensor Pixel and Its Pixel Signal Sampling Method

An image sensor, global shutter technology, applied in image communication, color TV components, TV system components and other directions, can solve the problem of inability to perform double sampling, achieve short frame transfer time, simple pixel structure, eliminate KTC effect of noise

Active Publication Date: 2016-04-20
GPIXEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantage is that it cannot perform correlated double sampling to remove KTC (reset) noise

Method used

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  • High Speed ​​Global Shutter Image Sensor Pixel and Its Pixel Signal Sampling Method
  • High Speed ​​Global Shutter Image Sensor Pixel and Its Pixel Signal Sampling Method
  • High Speed ​​Global Shutter Image Sensor Pixel and Its Pixel Signal Sampling Method

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Experimental program
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Effect test

Embodiment 1

[0025] Such as image 3 As shown, the high-speed global shutter image sensor pixel of the present invention includes a reset switch M1, a first buffer amplifier AMP1, a first sampling capacitor C1, a correction switch M2, a second buffer amplifier AMP2, a sampling switch SAMPLE, a second sampling capacitor C2, and a second sampling capacitor C2. Three buffer amplifiers AMP3, row selection switch READ; the first buffer amplifier AMP1 is composed of the first source follower M3 and the first current source load M4, and the second buffer amplifier AMP2 is composed of the second source follower M5 and the second The current source load M6 constitutes.

[0026] The third buffer amplifier AMP3 is composed of a third source follower M8.

[0027] The reset switch M1, the correction switch M2, the first source follower M3, the first current source load M4, the second source follower M5 and the second current source load M6 all use field effect transistors; the drain of the reset switc...

Embodiment 2

[0035] Such as Figure 5 As shown, the high-speed global shutter image sensor pixel of the present invention includes the reset switch M1, the first buffer amplifier AMP1, the first sampling capacitor C1, the correction switch M2, the second buffer amplifier AMP2, the sampling switch SAMPLE, and the second The sampling capacitor C2, the third buffer amplifier AMP3, and the row selection switch READ; the difference is that in this embodiment, the first buffer amplifier AMP1 adopts the first source follower M3, and the first source follower M3 is a field effect transistor , its drain is connected to the power supply voltage Vsf-pulse1; the second buffer amplifier AMP2 uses the second source follower M5, and the second source follower M5 is also a field effect transistor, and its drain is connected to the power supply voltage Vsf-pulse2; Facilitates the manufacture of smaller pixels and increases the fill factor of pixels.

[0036] Figure 6 Shown is the operation timing diagra...

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Abstract

The invention relates to a high-speed global shutter image sensor pixel and a method for sampling pixel signals of the high-speed global shutter image sensor pixel. The pixel comprises a reset switch, a photodiode, a first buffer amplifier, a second buffer amplifier, a third buffer amplifier, a first sampling capacitor, a second sampling capacitor, a correction switch, a sampling switch and a row selection switch. The method includes the steps of turning off the correction switch before exposure, conducting correction on the voltage of a right node of the first sampling capacitor, turning on the reset switch, enabling the photodiode to reset, turning off the reset switch, starting the exposure, turning off the correction switch so that the reset voltage of the photodiode can be collected to a left node of the first sampling capacitor through the first buffer amplifier, during the frame transfer time, turning on the sampling switch, electric potential information of the right node of the first sampling capacitor is collected to the second sampling capacitor through the second buffer amplifier and the sampling switch to be read through the third buffer amplifier and the row selection switch, turning off the sampling switch, and completing the exposure. According to the high-speed global shutter image sensor pixel and the method for sampling the pixel signals of the high-speed global shutter image sensor pixel, KTC noise can be eliminated, the frame transfer time is short, and the structure is simple.

Description

technical field [0001] The invention belongs to the technical field of semiconductor image sensing, and relates to a high-speed global shutter image sensor pixel and a sampling method for the pixel signal thereof. Background technique [0002] When shooting fast-moving objects, you need to use a global shutter to avoid image distortion. A typical global shutter CMOS pixel such as figure 1 As shown, it consists of reset switch M1, photodiode D, buffer amplifier AMP1, sampling switch M4, sampling capacitor C1, buffer amplifier M5 and row selection switch M6. The pixel is based on the traditional 3T pixel structure. First, the reset switch is closed and the photodiode is reset. Then the reset switch M1 is turned off, and the pixel starts to be exposed. The photodiode converts the received light signal into an electrical signal. During the frame transfer time, first the sampling switch M4 is closed and the electrical signal converted by the photodiode is stored on the sampling...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/374H04N5/378H04N5/363
Inventor 马成王欣洋
Owner GPIXEL