Journal of Optics

, Volume 46, Issue 1, pp 1–7 | Cite as

Simulation of improved CMOS digital pixel sensor for computer vision

  • Y. V. ChavanEmail author
  • D. K. Mishra
  • D. S. Bormane
  • A. D. Shaligram
Research Article


The charge coupled device (CCDs) were used as image sensor for the imaging. Thereafter CMOS sensors introduced like passive pixel sensors, active pixel senor (APS) could give the advantages in the implementation, so the APS could compete with CCDs. However, APS suffered with the problem of poor resolution and fill factor, which resulted the CCD image sensor to retain popularity. The digital pixel sensor (DPS) has overcome the problems associated in APS. This gave many more advantages for effective pixel optimization. Recently, DPS came with the op-amp comparator to implement the ADC on chip for each pixel. This has definitely added advantage over the previous sensor in terms of power, pixel size and the fill factor. In this paper comparator used is modified and replaced by the CMOS inverter with proper setting of the operating point over existing DPS image sensor. In the first part the analysis for the modification is discussed while in the second part simulation results are given for the pixel implementation of the image sensor. The results are tabulated for 2 × 2 and 4 × 4 array implementation.


Image sensors APS PPS CCD Comparator circuits [20] DPS ADCs 


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Copyright information

© The Optical Society of India 2016

Authors and Affiliations

  • Y. V. Chavan
    • 1
    Email author
  • D. K. Mishra
    • 2
  • D. S. Bormane
    • 1
  • A. D. Shaligram
    • 3
  1. 1.Rajarshi Shahu College of EngineeringTathawade, PuneIndia
  2. 2.SGSITSIndoreIndia
  3. 3.Department of Electronic scienceUniversity of PunePuneIndia

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