A vision sensor with on-pixel ADC and in-built light adaptation mechanism

Amine Bermak, Abdessellam Bouzerdoum, Kamran Eshraghian

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

In this paper we propose an on-pixel Analogue-to-Digital Converter (ADC) based on pulse frequency modulation (PFM) scheme. This PFM based converter presents a viable solution for pixel-level based ADC. It uses a simple and robust circuit that can be implemented in a compact area resulting in a 23% fill-factor for a digital vision sensor in 0.25 μm CMOS technology. An in-built light adaptation mechanism has also been implemented which allows the sensor to better adapt to low-light intensity or to adjust the sensor saturation level. As a consequence, the proposed sensor features a programmable dynamic range. Image lag is eliminated since a reset of the photodetector is performed after the conversion period. A prototype comprising a 32 × 32 pixel array has been implemented in CMOS 0.25 μm technology. Each pixel occupies an area of 45 × 45 μm2 with an average power consumption of 85 μW per pixel.

Original languageEnglish
Pages (from-to)1091-1096
Number of pages6
JournalMicroelectronics Journal
Volume33
Issue number12
DOIs
Publication statusPublished - Dec 2002
Externally publishedYes

Fingerprint

light adaptation
analog to digital converters
Digital to analog conversion
Pixels
pixels
pulse frequency modulation
Pulse time modulation
sensors
Sensors
CMOS
Photodetectors
luminous intensity
dynamic range
converters
photometers
Electric power utilization
time lag
prototypes
saturation
Networks (circuits)

Keywords

  • CMOS imagers
  • CMOS vision sensors
  • Light adaptation
  • Pulse frequency modulation
  • VLSI

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering

Cite this

A vision sensor with on-pixel ADC and in-built light adaptation mechanism. / Bermak, Amine; Bouzerdoum, Abdessellam; Eshraghian, Kamran.

In: Microelectronics Journal, Vol. 33, No. 12, 12.2002, p. 1091-1096.

Research output: Contribution to journalArticle

Bermak, Amine ; Bouzerdoum, Abdessellam ; Eshraghian, Kamran. / A vision sensor with on-pixel ADC and in-built light adaptation mechanism. In: Microelectronics Journal. 2002 ; Vol. 33, No. 12. pp. 1091-1096.
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