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Analog-to-digital converter and controlling method thereof

A technology of analog-to-digital converters and control modules, which is applied to TVs, color TV parts, electrical components, etc., can solve problems affecting image quality and the dynamic range of image sensors, and achieve the goal of improving image quality and dynamic range Effect

Inactive Publication Date: 2007-01-03
BEIJING SUPERPIX MICRO TECHNOLOGY CO LTD
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  • Description
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Problems solved by technology

Similarly, the output level of the CDS varies greatly with the change of the scene. The reference voltage source 105 provides a fixed voltage, which cannot be consistent with the CDS output in various scenes, thereby affecting the dynamic range of the image sensor output and affecting the image quality.

Method used

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  • Analog-to-digital converter and controlling method thereof
  • Analog-to-digital converter and controlling method thereof
  • Analog-to-digital converter and controlling method thereof

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Embodiment Construction

[0051] The present invention changes the sample holder 101 in the general pipeline ADC into a programmable gain amplifier (PGA), and changes the reference voltage source 105 into an output controllable voltage source to improve the dynamic range of the image sensor.

[0052] The structure of the present invention is as image 3 As shown, the pipeline ADC of the present invention is composed of the following modules: programmable gain amplifier (PGA) 201, sub-circuits 2021, 2022, ... 202N (N≥2), analog-to-digital conversion circuit 204, output controllable voltage source 205 , correction encoding circuit 206 , clock generation circuit 207 and control module 208 . The sub-circuits 2021, 2022, . and sample-and-hold difference amplifiers (202c, 203c, . . . 20Nc). The resolution accuracy of each sub-circuit can be adjusted according to different requirements. According to the present invention, according to the scene difference captured by the image sensor, the corresponding dig...

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Abstract

An A / D converter consists of sampling holder, A / D converting circuit, reference voltage source, correction-coding circuit, clock generating circuit and various grades of sub circuits. It is featured as controlling programmable gain amplifier and controllable voltage source by output control signal according to data collected by image transducer for raising image quality.

Description

technical field [0001] The invention relates to the technical field of integrated circuit design of microelectronics, in particular to an analog-to-digital converter for a CMOS image sensor and a control method thereof. Background technique [0002] At present, digital processing technology is developing vigorously, but all existing in nature are analog signals, so ADCs that convert analog signals into digital signals are widely used. For example, in a digital camera, the image sensor converts the light signal into an analog electrical signal, and then an ADC is required to convert the analog electrical signal into a digital signal for processing by a digital image processor. [0003] Commonly used ADCs can be divided into full-parallel ADCs, semi-parallel ADCs, interpolation ADCs, and Σ-ΔADCs and pipeline ADCs according to their structures. The conversion speed of full-parallel ADC, semi-parallel ADC, and interpolation ADC is very high, but the conversion accuracy is low. ...

Claims

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Application Information

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IPC IPC(8): H04N3/15H04N5/335
Inventor 程杰赵建波
Owner BEIJING SUPERPIX MICRO TECHNOLOGY CO LTD
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