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研究生: 蘇嘉賓
Chia-Bin Su
論文名稱: 高動態範圍之數位式像素CMOS影像感測器之實作
The Implementation of a Digital-Pixel CMOS Image Sensor with Wide Dynamic Range
指導教授: 黃錫瑜
Shi-Yu Huang
口試委員:
學位類別: 碩士
Master
系所名稱: 電機資訊學院 - 電機工程學系
Department of Electrical Engineering
論文出版年: 2005
畢業學年度: 93
語文別: 英文
論文頁數: 56
中文關鍵詞: 影像感測器
外文關鍵詞: CMOS, Image, Sensor, Digital, Pixel
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  • 在現代生活中,數位影像系統扮演著一個很重要的角色,影像感測器可以提供我們生活上的便利,數位像機和網路攝影機就是很好的例子。拿現在兩大感測元件主流:電子耦合式(CCD)影像感測器和互補式金氧半導體式影像感測器(CMOS Image Sensor)做比較,對互補式金氧半導體式影像感測器而言,雖然有動態範圍低,雜訊較大的問題,但是他的耗電量低,整合度高的優勢,是值得我們去做深入的研究。
    在這篇論文中,我們使用一個由我們的學長提出的新式數位式像素元件來完成一個136 x 136的CMOS影像感測器。此新式數位式像素元件使用比現在文獻上還要少的電晶體並且擁有高達90dB的高動態範圍。模擬的結果顯示出這新式元件的響應曲線與人眼對光的響應曲線非常相似,都是一個對數型態的轉換函數。這樣的曲線非常適合用來當作影像感測器的感測元件。為了完成一個完整的影像晶片,我們設計一個類比對數位的轉換器以及控制電路。除此之外,我們也建立一個量測系統用來測量和分析此影像感測器的影像資料。此量測系統包括一個FPGA版和一套GUI介面程式。FPGA版用來捕捉影像資料而GUI介面程式則用來分析影像資料。我們也利用佈局後模擬的結果建立一個系統階段的模擬流程,以驗證這新式數位式像素元件的特性。我們將展現一些圖片來證明此新式元件補抓到的影像比一般傳統3T架構來的清晰。


    In the thesis, we consider the implementation of a CMOS image sensor using a novel DPS (digital pixel sensor) proposed by my colleagues. The underlying DPS uses fewer transistors than other DPS in the literature and has a wide dynamic range, more than 90dB. The simulation results show that this DPS has a light-to-digital-code transfer curve with logarithmic-response. For accomplishing the CMOS image sensor chip, we design a D/A converter and a control circuit. In addition, a measurement system with FPGA board and GUI program is also built in order to test the chip and analyze the image data. A simulation environment with post-layout accuracy is used to demonstrate the sensor’s performance. We show that a number of pictures, e.g., the one of fireworks, can be captured more clearly than a traditional sensor.

    Contents Abstract…………………………………………………………………1 Contents…………………………………………………………………2 List of Figures………………………………………………………4 List of Tables…………………………………………………………6 Chapter 1 Introduction………………………………………………7 1.1 Motivation…………………………………………………8 1.2 Thesis Organization………………………………………9 Chapter 2 Preliminaries……………………………………………10 Chapter 3 Review of The Underlying DPS Cell…………………14 3.1 Operation……………………………………………………14 3.2 System-Level Simulation……………….……………………17 Chapter 4 Implementation of CMOS Image Sensor………………20 4.1 The D/A Converter....................................20 4.2 The Control Logic……………………………………………23 4.3 The Measurement System……………………………………25 Chapter 5 Experimental Results…………………………………27 5.1 Simulation Results of Circuits.......................27 5.1.1 Digital Pixel Sensor……………………………………27 5.1.2 D/A Converter…………………………………………29 5.1.3 Control Logic…………………………………….......31 5.2 System-Level Simulation Results…………………32 5.3 Test Key Layout………………………………………………34 5.4 Measurement Results of Test Key…………………………35 5.5 Chip Implementation…………………………………………38 5.6 Chip Characteristic…………………………………………40 5.7 Chip Layout…………………………………………………..41 Chapter 6 Conclusion………………………………………………….42 Bibliography……………………………………………………………43

    [1] A. Bermak, “A CMOS Imager with PFM/PWM Based Analog-to-Digital Converter,” Proc. of International Symposium Circuits and Systems (ISCAS), Vol. 4, pp. 53-56, May 2002.
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    [7] A. Kitchen, A. Bermak, and A. Bouzerdoum, “PWM Digital Pixel Sensor Based on Asynchronous Self-Resetting Scheme,” Proc. of IEEE Electronic Device Letter, Vol. 25, No. 7, pp. 471-473, July 2004.
    [8] B.-R. Lin, S.-Y. Huang, C.-H. Lai, and Y.-C. King, “A High Dynamic Range CMOS Image Sensor Design Based On Two-Frame Composition,” Proc. of Int'l SOC Conf., pp. 389-392, Sept. 2003.
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    [13] J.-L. Trepanier, M. Sawan, Y. Audet, and J. Coulombe, “A Wide Dynamic Range CMOS Digital Pixel Sensor,” Proc. of 45th Midwest Symposium on Circuits and Systems, Vol. 2, pp. 437-440, Aug. 2002.
    [14] C. Xu, C. Shen, A. Bermak, and M. Chan, “A New Digital-Pixel Architecture for CMOS Image Sensor with Pixel-level ADC and Pulse Width Modulation Using a 0.18um CMOS Technology,” Proc. of IEEE Electron Devices and Solid-State Circuits Conf., pp. 265-268, Dec. 2003.
    [15] O. Yadid-Pecht and E. R. Fossum, ”Wide Intrascene Dynamic Range CMOS APS Using Dual Sampling,” Proc. of IEEE Transactions on Electron Devices , Vol. 44 , No. 10 , pp. 1721–1723, Oct. 1997.
    [16] D. Yang, A. El Gamal, B. Fowler, and H. Tian, “A 640x512 CMOS Image Sensor with Ultra Wide Dynamic Range Floating-Point Pixel-Level ADC,” Proc. of International Solid-State Circuits Conf., pp. 308-309, Feb. 1999.
    [17] D. Yang, B. Fowler, and A. El Gamal, “A Nyquist Rate Pixel-Level ADC For CMOS Image Sensors,” Proc. of IEEE Journal of Solid-State Circuits, Vol. 34, pp. 348-356, March 1999.
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