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Research of the Output Characteristics on Dual Channel CCD

Author: HuangTao
Tutor: LiaoSheng
School: Institute of Optoelectronic Technology
Course: Electronics and Communication Engineering
Keywords: Dual Channel CCD Front End Processing Circuit AD9978A DriveCircuit Non-uniformity
CLC: TP212
Type: Master's thesis
Year: 2013
Downloads: 18
Quote: 0
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Abstract


CCD (Charge Coupled Devices) image sensor, with its high sensitivity, widedynamic range, fast response, has become one of the two mainstream image sensorsnowadays. Scientific CCD, moreover, with its high quantum efficiency, highperformance SNR (signal-to-noise rate) and wide temperature range has played adecisive role in the research field of astronomic detector, aeronautic, weak opticalimaging science and etc.With the increasing of CCD pixel, the speed of data transmission and dataprocessing rate on the CCD camera have been put forward to higher expectations.Multi-channel CCD camera technology not only meet the imaging requirements ofhigh performance SNR and other factors in imaging precision, but also has a greatincrease in speed. However, the new technology has brought new problems: imagestitching is needed after multi-channel image data processing; on account of the offsetand gain of the hardware in each channel is inconsistent or the differences of theexternal environment such as working temperature and other so many factors, eachchannel has small differences in image brightness, namely non-uniformity. Thesedifferences stand out in weak light conditions, especially.The traditional method is to solve the problem by giving the non-uniformalgorithm in a software way. Aiming at these problems, in this paper, ADI’s new14-bit dual channel LVDS output image processing chip AD9978A is used toameliorate of scientific dual-channel CCD camera in the hardware circuit, so as toensure the same bias and work environment of dual channel during the image datatransmission and data processing.The main research content of this paper includes the following aspects:(1) A driving circuit and a front end processing circuit of dual channel CCD isdesigned in this paper. The driving circuit, which is the nodus, contains a horizontalclock driving circuit, a vertical clock driving circuit and an output protection circuit.(2) The AD9978A chip as the core of the camera design, its characteristicanalysis and use method is one of the key content in this paper. Aiming at the mainnoise source of CCD camera, dark current noise and reset noise (kTC), the chipprovides correlated double sampling module and black level compensation module foreliminating. The precision timing core ensures the camera capable of sampling andblack level clamping at the best position.(3) Several main output characteristics of the CCD camera is discussed: noisecharacteristics, non-uniformity, dynamic range and responsibility. In order toconvenient for the user to interact with the host computer, a communication moduleof the CCD camera is designed at the same time. Moreover, a eliminating smearalgorithm aiming is provided for the problem of smear, which is inevitable for theFrame Transfer CCD FTT1010-M in the camera.In current, the signal-to-noise ratio of the CCD camera is about50dB and thenon-uniformity can be up to about1.9%in the case of10F/s for frame frequency and15ms for the exposure time.

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