A) Color is a function of the filter (array) in front of the sensor
cells. These filter arrays can be put in front of CCDs or CMOS sensors
with little change in output color from the CCD versus CMOS
architecture of the cells.

B) CMOS sensors need to have the voltage turned on durring the charge
accumulation stage or the charge can leak away. This only takes
leakage amounts of power (small). However, since camera CMOS sensors
are designed for short duration imaging, the A/D channels are left
powered on and these do burn power and heat up one corner (or two) of
the sensor chips durring the charge accumulation phase. In principle,
one COULD design a CMOS sensor that was power competitive wrih CCD
sensors during the charge accumlatin phase--its just not been done
(yet). Most ofthe power of CMOS sensors are in the A/D channels.

C) There are situations where CMOS devices would not take to being
chilled to N2 temperatures, I don't know the doping profies used in
CMOS transistors, but some are not as tollerant of liquid N2 temps as
are CCDs. Thermo-electric coolers don't get cold enough to encounter
there transistor operating environments. In principle this could be
engineered away at some cost in ease of fabrication (i.e. yield).

D) CMOS sensors have faster readout times due to having a
transconductance amplifier in* the sensor cell (*)or shared between 2
or 4 cells. This is a single transistor that takes the stored charge
uses it as a voltage and this voltage in turn causes the transistor to
opeate as a current source. The column receiver supplies the current
and converts the current from the cell back to a voltage for the A/D
converters. Thus the stored charge does ot have to compete with the
heavlily loaded colum wire making the job of sensing the stored charge
much easier.

E) Camera sensors have A/D systems where the first 5%-ish and the last
5%-ish of the potential voltage range are not used. This means that
there does not have to be any temperature stabilization in the A/D
channels--and this causes a loss of 0.3-bits of A/D resolution. So a
12-bit A/D sensor ends up with a dynamic range of 11.2-bits rather
than the Nyquist 11.5-bits. I suspect the better CCD A/Ds COULD
temperature stabilize and gain most of this minor loss in S/N back.
Whether they do or not is not known to me.

F) depending on what KIND of noise one is talking about, either CMOS
or CCD sensors would win. Readout noise is won by CMOS sensors because
all the tricky logic is on the same chip (double sampling correlated
readout), overall noise is won by CCD converters because (typically)
more money is spent on getting the A./D right--and running it slower
so the flicker (1/f) noise is better. CCD win handily once dark
current noise is included (more than dozens of seconds of exposure) as
is typical for astronomical sensors.

Thus, CMOS make for better sensors when the duraton of the image
capture is short and there may be multiple images taken in a short
amoung of time, while CCD sensors are better when the durratiion of
image capture is long.

mitch