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[OM] OT: Digi CMOS vs CCD

Subject: [OM] OT: Digi CMOS vs CCD
From: Tim Hughes <timhughes@xxxxxxxx>
Date: Fri, 18 Jun 2004 02:20:59 -0700 (PDT)
For those interested in the pros and cons of "professional" CCD versus CMOS 
sensors, there is a brief (marketing style!) article in the latest professional 
magazine Photonics Spectra. (available from most university libraries). Only 
available as partial abstract online:
http://www.photonics.com/spectra/features/XQ/ASP/artabid.804/QX/read.htm
 
This is likely biased because the author works for Dalsa that makes mainly CCD 
devices for industrial applications. A few claims : the CMOS sensors generally 
have lower fill factors because of higher on chip complexity.  The added 
metalization layers are thicker putting the sensor at the bottom of a deeper 
and narrower well.  This leads to more color shifts and more stringent lens 
requirements. This is true even when on chip micro-lenses are used.  A pity the 
article is not better written with a bit more detail.
Tim Hughes


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