Title page for etd-0729118-133453


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URN etd-0729118-133453
Author Jing-Sheng Chang
Author's Email Address No Public.
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Department Computer Science and Engineering
Year 2018
Semester 1
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title A Novel Linear-Logarithmic Active Pixel Sensor for the CMOS Image Sensor with wide dynamic range
Date of Defense 2018-08-23
Page Count 60
Keyword
  • 3T APS
  • Dynamic Range
  • CMOS Image Sensor
  • Fill Factor
  • Logarithmic Pixel
  • Abstract In this thesis, a new active pixel architecture is designed using TSMC 0.18μm 1P6M 1.8V mixed signal processing, which is different from linear pixel sensor (3T APS) and logarithmic pixel sensor (Logarithmic Pixel). There are cases where the dynamic range is insufficient under high and low illumination, respectively. The framework proposed in this thesis has a dynamic range of up to 160db, which is much higher than the above two architectures. It can be applied to the high dynamic range CMOS image sensors.
    In terms of circuit design, in order to achieve high dynamic range, this thesis adopts a linear-logarithmic active pixel architecture as the base for improvement. The main purpose is to pass the output value of the source follower back to transistor’s gate, which is in the logarithmic architecture. When the photocurrent is large, the output value of the source follower is lower, thereby increasing the output current of the transistor to delay the voltage drop rate of the sensing terminal of the photodiode and improve the dynamic range of the pixel sensor. In addition, due to the low complexity of the circuit, this architecture also has a higher fill factor (Fill Factor), which can be as high as 55%, which is much better in the conventional high dynamic range sensors.
    Advisory Committee
  • Shiann-Rong Kuang - chair
  • Xin-Yu Shih - co-chair
  • Ko-Chi Kuo - advisor
  • Files
  • etd-0729118-133453.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2018-08-29

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