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- Title
Application of dynamic counter circuits in programmable digital pixel sensor architectures.
- Authors
Habibi, M.
- Abstract
ABSTRACT In this paper, a high dynamic range digital pixel sensor (DPS) is presented. Each pixel receives light illumination and converts the intensity level to a digital code. The analog-to-digital conversion is performed in-pixel. The pixel structure incorporates light to pulse signal converter and compact in-pixel dynamic counter to convert the pulse signal to binary coded data. Different variations of the custom design dynamic counters are analyzed in a 0.18 µm technology, and their application in the DPS is investigated. It is shown that due to the limited clock frequency required in the sensor pixel, the dynamic counter can be incorporated as a pulse to binary code converter. Performance specifications such as power consumption, dynamic range and resolution of the presented structure are investigated using a 100 × 100 pixel sensor. The presented sensor is an effective solution for use in digital field programmable smart image sensors and vision chips since the pixel output is a regular binary code while no global digital counter bus is required. The fill factor of the presented design remains close to that of typical DPSs. Copyright © 2013 John Wiley & Sons, Ltd.
- Subjects
IMAGE sensors; DIGITIZATION; ANALOG-to-digital converters; BINARY codes; DIGITAL counters
- Publication
International Journal of Circuit Theory & Applications, 2014, Vol 42, Issue 10, p989
- ISSN
0098-9886
- Publication type
Article
- DOI
10.1002/cta.1900