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《Opto-Electronic Engineering》 2007-01
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Research of a novel architecture of a 2D digital array working as position sensitive detector

LI Tian-ze1,WANG Sheng-de2,SHEN Jin1,WANG Shu-yun1 ( 1. College of Electrical and Electronic Engineering, Shandong University of Technology, Zibo 255049, China;2.Department of Electronic, Zhengzhou University, Zhengzhou 450052, China )  
In this paper, principle and characteristics of the Position Sensitive Detector (PSD) are introduced. The relation of background light and the surveying precision are analyzed on the basis of the principle and the equation of PSD. The pixel M (i,j) is connected to the row and column bit-line by means of tow bipolar transistors working as distributed low peak detectors. The pixel, which detects the highest light intensity among its bit-lines, exhibits the lowest output voltage. The photo-generated signal is analog preprocessed using means of a distributed image peak detector; contour digitization for extracting the image centroid position. The sensor implements an analog intensive parallel computation for the estimation of the centroid on the photosensitive area. The voltage on each bit-line is compared with the normalized threshold by clocked comparator obtaining digitized images. A novel architecture of 2D digital array working as position measurement is presented and power consumption is proportional to the square root of the number of pixels.
【Fund】: 山东省教育厅基金资助项目(J05C51);; 山东理工大学基金资助项目(2004KJM13)
【CateGory Index】: TN36
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