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CMOS Image sensor
created by
trondgs
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(2 y)
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Sun Mar 04 2001 at 17:07:17
The
CMOS
image
sensor
has the last few
years
evolved
in to a
competitor
to the
Charged Coupled Device
. There are two
basic
designs of CMOS sensors,
passive
and
active
array
.
The
passive
CMOS
image
sensor
is basically just an
array
of
photodiodes
with a
common
amplifier
for all diodes in a column. But since the
photodiode
s have a relatively low
sensitivity
to
light
, this
system
is
sensitive
to
noise
. This problem
rises
the
further
away the
diode
is from the
amplifier
.
In the
active
sensor
a
transistor
is added to each diode, thus the
signal
is
stronger
and
less
susceptible
to
noise
. But the
addition
of a
transistor
means that each
sensor
in the
array
becoms bigger and this causes the
arrays
resolution
to fall. The
CCD
uses only one
component
and can be made with a
higher
density
. But one big
advantage
with the CMOS is that it uses
less
power. This means a
lower
power drain
on a portable device's
power source
. The
technology
to produce
CMOS
sensor
s has also fallen in price the last
years
. This has made the
active
CMOS
image
sensor
a
good
choice
in cheaper, low resolution,
digital
camera
s.
As the
technology
behind
this
type
of
sensor
advances
, it will probably have a
future
in
mobile
device
s.
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