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Proceedings Paper

How small should pixel size be?
Author(s): Ting Chen; Peter Bert Catrysse; Abbas El Gamal; Brian A. Wandell
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Paper Abstract

Pixel design is a key part of image sensor design. After deciding on pixel architecture, a fundamental tradeoff is made to select pixel size. A small pixel size is desirable because it results in a smaller die size and/or higher spatial resolution; a large pixel size is desirable because it results in higher dynamic range and signal-to-noise ratio. Given these two ways to improve image quality and given a set of process and imaging constraints an optimal pixel size exists. It is difficult, however, to analytically determine the optimal pixel size, because the choice depends on many factors, including the sensor parameters, imaging optics and the human perception of image quality. This paper describes a methodology, using a camera simulator and image quality metrics, for determining the optimal pixel size. The methodology is demonstrated for APS implemented in CMOS processes down to 0.18 (mu) technology. For a typical 0.35 (mu) CMOS technology the optimal pixel size is found to be approximately 6.5 micrometers at fill factor of 30%. It is shown that the optimal pixel size scales with technology, btu at slower rate than the technology itself.

Paper Details

Date Published: 15 May 2000
PDF: 9 pages
Proc. SPIE 3965, Sensors and Camera Systems for Scientific, Industrial, and Digital Photography Applications, (15 May 2000); doi: 10.1117/12.385463
Show Author Affiliations
Ting Chen, Stanford Univ. (United States)
Peter Bert Catrysse, Stanford Univ. (United States)
Abbas El Gamal, Stanford Univ. (United States)
Brian A. Wandell, Stanford Univ. (United States)


Published in SPIE Proceedings Vol. 3965:
Sensors and Camera Systems for Scientific, Industrial, and Digital Photography Applications
Morley M. Blouke; Nitin Sampat; Thomas Yeh; Nitin Sampat; George M. Williams; Thomas Yeh, Editor(s)

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