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A vision sensor with on-pixel ADC and in-built light adaptation mechanism
- Source :
-
Microelectronics Journal . Dec2002, Vol. 33 Issue 12, p1091. 6p. - Publication Year :
- 2002
-
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. [Copyright &y& Elsevier]
- Subjects :
- *COMPLEMENTARY metal oxide semiconductors
*PULSE frequency modulation
Subjects
Details
- Language :
- English
- ISSN :
- 00262692
- Volume :
- 33
- Issue :
- 12
- Database :
- Academic Search Index
- Journal :
- Microelectronics Journal
- Publication Type :
- Academic Journal
- Accession number :
- 8575697
- Full Text :
- https://doi.org/10.1016/S0026-2692(02)00114-3