Lets be here again
The material in here will report on our findings with the new EEV42
devices, eventually, enough of that - have a look at the real information.
These are just some of the pictures scanned from the photographs taken
at StingRay City and during a beach dive made by myself and Paul during
Saturday before the hard work started at lunch-time. The camera cost 8 pounds
and was useable to the dizzy depths of 12 feet, though it did survive to
60 feet but the wind-on mechanism wouldn't work at that depth.
Enjoy - for those who didnt attend - this is (part of) what
you missed. I have used Icons for the real pics which are of the order of
100kbyte each. I do have a few more of Captain Marvels Boat Dive which I will
scan and put up over the next few days along with the EEV data (of course).
For those who want to display the full images see
View Full Cayman Images
Latest Results from the EEV42 CCD Contract
Tabulated below is a summary of the details made public at the Cayman
meeting regarding the noise performance of our EEV42-10 and 42-80 devices.
These are 3-side buttable low-noise 4kx2k devices made by EEV for a
contract placed between R.G.O.(UK), A.A.T.(Australia) and Galileo(Italy).
The output stages consist of a novel design which permits high speed
sampling with good noise performance. It is also possible, by manipulating one
of the output gate structures to alter the node capacitance and hence change
the gain and signal handling capacity.
CCD Temp = -115C
OG2 LOW
Numbers in parentheses in the gain column refer to data
taken with our Iron 55 source.
This device was a FRONT-SIDE, 42-80. EEV have informed me (13/2/97)
that the noise on ANY THINNED CCD will be worse than that on an
un-thinned device due to fringing fields affecting the node capacitance.
We should expect to measure a 'slightly' higher noise on thinned devices.
I do have evidence that this is indeed the case, the latest thinned 42-80
I have do not exhibit the same performance as this device....
| CDS(Ref+Sig us) |
20 + 20 |
10 + 10 |
4 + 4 |
1 + 1 |
0.5 + 0.5 |
|---|
| Total Noise(T²adu) |
19 |
14 |
6.5 |
4.5 |
2.4 |
|---|
| System Noise(S²adu) |
4 |
3.5 |
3.5 |
2.5 |
? |
|---|
| Gain (G e/adu) |
0.5(0.6) |
0.6(0.7) |
0.94(1.05) |
0.2.4 |
2.9 |
|---|
Read Noise
(sqrt[T²-S²]xG e- rms) |
2.0 |
1.9 |
1.6 |
3.5 |
4 |
|---|
OG2 HIGH
| CDS(Ref+Sig us) |
20 + 20 |
10 + 10 |
4 + 4 |
1 + 1 |
|---|
| Total Noise(T²adu) |
18 |
12 |
4.5 |
3.5 |
|---|
| System Noise(S²adu) |
4 |
3.5 |
3.5 |
2.5 |
|---|
| Gain (G e/adu) |
1.0 |
1.2 |
1.8 |
4.6 |
|---|
Read Noise
(sqrt[T²-S²]xG e- rms) |
4.0 |
3.6 |
1.8 |
4.5 |
|---|
On-chip amp Gain = 0.4 (+/-30%)
'FET' Sensitivity = 5uV/electron (+/-50%)
I am... apo
Lets be here again