|
|
Hi Patrick,
> Thank you again for the excellent insight.
>
> We are not doing strict CDS, because of the nature of the CMOS device.
> The reset and video levels are sampled and stored at different times
> on the device (as in most CMOS imagers). Also, there is only one
> output on the device.
Ok, i am not very familiar with cmos devices, so my insight belongs
more to CCDs.
Nevertheless (is this a english word?), readout noise should be lower.
> As far as acquisition board goes, I think you are exactly right, the
> acquisition board may be what is limiting me. I will be moving to a
> more sophistiated setup soon.
So the readout noise is more a quantization noise.
> But does what I see so far at least advance the theory that I'm never
> in a shot-noise limited region because at maximum signal, my noise is
> only 2.7 times the read noise?
My not very professional diagram, depending on 280e readout noise and
500ke fullwell looks like this:
http://freenet-homepage.de/JDierks/curve.gif
I dont know how much saturation can flatten the slope, but 0.2?
But im quite sure that a lower noise level should give you a much
better approximization.
Best regards,
Jens
|
|
