More stuff,
http://www.machinevisiononline.org/public/articles/Mark_Butler.pdf
Slide 16 reads....
Robots and Vision 2003
CMOS Imaging and Application in Machine Vision
Impact of Shrinking Design Rules
Forced upon machine vision by foundries
satisfying the needs of the consumer market
leads to greater pixel resolutions in
smaller packages
leads to smaller pixel sizes (3um-5um)
leads to lower operating voltages (2.5V or
3.3V)
leads to poorer dynamic range
Slide 19 reads....
Robots and Vision 2003
CMOS Imaging and Application in Machine Vision
Impact to Dynamic Range
Lower operating voltages reduce the
output voltage of the sensor amplifier
hence the electron storage capacity (full
well) of the device becomes smaller
A reduction in full well leads to poorer
signal to noise or dynamic range because
shot noise reduces at a slower rate
The relationship of full well to lower
operating voltages is sub-linear
Slide 21....
Robots and Vision 2003
CMOS Imaging and Application in Machine Vision
Conclusions
There is a trade off between speed and
windowing (parallel, single sloped ADC vs.
serial ADC)
~7um pixel size provides good MTF, consider
this when selecting smaller pixel devices
Shrinking design rules improve fill factor, but
lower operating voltages decrease dynamic
range
Consider S:N ratios when using small full wells
From a marketing spiel...
http://www.pulnix.com/Imaging/i-techA.html
Quote--> "The design of the 1" imager used in the PULNiX cameras will not saturate as quickly as the 2/3" imager used in the other cameras, allowing a higher dynamic range."
Zerstorer?