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Design of CMOS DPS based on Non-Linear Current Source

Shaker Shiran, Dariush | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 50337 (55)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Haj Sadeghi, Khosrow
  7. Abstract:
  8. Few years ago, when people were talking about image sensors, the minds were automatically focusing on the pictures and photos that were/are taken for recording the memories. Nowadays, however, image sensors have prominent and unbelievable role in different aspects of our life, which "image" is only representing part of this role. A wide variety of applications image sensors can be enumerated such as, Scientific, security, medical, machine vision, ITs, biometrics, automotive, etc. To evaluate the quality of an image sensor, there are different parameters, from the dynamic range, high resolution and suitable speed to low noise, low power consumption and other parameters. The art of companies appears in the efficient design of the sensor that can apply a logical relation between applications and quality parameters necessary for those applications. High speed is one of the important parameters for image sensors that require in applications such as scientific, medical, machine vision, motion capture, and so on. In this dissertation a high speed scheme for DPS, as one type of image sensors is proposed. The presented structure exploits a low power non-linear current source which amplifies photodiode voltage and charges comparator inputs proportional with photodiode voltage. In addition, modified comparator with internal positive feedback has been used. Designed configuration is simulated using TSMC 0.18µm CMOS technology and HSPICE circuit simulator. Simulated circuit works properly in higher frequencies compared with conventional scheme. The presented method is appropriately fits with high frame/second applications
  9. Keywords:
  10. Current Mirror ; Complementary Metal Oxide Semiconductor Technology (CMOS) ; Digital Pixel Sensor (DPS) ; Low Power Comparator

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