On analog comparators for CMOS digital pixel applications. A comparative study

Voltage comparator is the only - apart from the light-to-voltage converter - analog component in the digital CMOS pixel. In this work, the influence of the analog comparator nonidealities on the performance of the digital pixel has been investigated. In particular, two versions of the digital pixel...

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Bibliographic Details
Published in:Bulletin of the Polish Academy of Sciences. Technical sciences 2016-06, Vol.64 (2), p.271-278
Main Author: Jendernalik, W.
Format: Article
Language:English
Subjects:
analog comparator
CMOS digital pixel
CMOS image sensor
fixed pattern noise (FPN)
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Summary:Voltage comparator is the only - apart from the light-to-voltage converter - analog component in the digital CMOS pixel. In this work, the influence of the analog comparator nonidealities on the performance of the digital pixel has been investigated. In particular, two versions of the digital pixel have been designed in 0.35 μm CMOS technology, each using a different type of analog comparator. The properties of both versions have been compared. The first pixel utilizes a differential comparator with the increased size and improved electrical performance. The second structure is based on a very simple non-differential comparator with a reduced size and degraded performance. Theoretical analysis of the comparator nonideality effect on the quality of the image obtained from the digital pixel matrix as well as simulation results are provided.
ISSN:2300-1917
0239-7528
2300-1917
DOI:10.1515/bpasts-2016-0030