Derating CCD detectors

[ChrisNeumi]

I want to use a conventional CCD Detector (e.g.E2V42-80) in a space
project. I did not find anything in the ESA derating guidelines about
derating of CCD detectors. Can anyone help me?

 

[Tim Wescott]

I want to use a conventional CCD Detector (e.g.E2V42-80) in a space
project. I did not find anything in the ESA derating guidelines about
derating of CCD detectors. Can anyone help me?

Derating against what? Poor illumination? Vibration? Temperature?
Trying to image a guy in a striped purple suit?

 

[Ian Stirling]

Derating against what? Poor illumination? Vibration? Temperature?
Trying to image a guy in a striped purple suit?

I'm guessing radiation.

 

[ChrisNeumi]

I'm guessing radiation.

Of course radiation has to be considered during the design with
additional margin. (Action for the manufacturer of the CCD to provide
a radiation tolerant design)

But I mean derating of operational (electrical) parameters:
For analog circuits you have to derate e.g. power consumption (mostly
this is done by limiting bandwidth); for digital circuits e.g. the
clock/data rates are derated.

What shall I do with CCDs?

 

[Ian Stirling]

Of course radiation has to be considered during the design with
additional margin. (Action for the manufacturer of the CCD to provide
a radiation tolerant design)

But I mean derating of operational (electrical) parameters:
For analog circuits you have to derate e.g. power consumption (mostly
this is done by limiting bandwidth); for digital circuits e.g. the
clock/data rates are derated.

What shall I do with CCDs?

Derate what?
In general, various factors can be reduced, to mitigate the effects
of external conditions, or to increase reliability.
Run a power transistor at lower temperature than the absolute limit, and
it'll last longer.
Run a CPU at a lower clock rate, and voltage, and it'll produce
less heat.
....
There are various meanings of 'derate'.

 

[Rob Gaddi]

Of course radiation has to be considered during the design with
additional margin. (Action for the manufacturer of the CCD to provide
a radiation tolerant design)

But I mean derating of operational (electrical) parameters:
For analog circuits you have to derate e.g. power consumption (mostly
this is done by limiting bandwidth); for digital circuits e.g. the
clock/data rates are derated.

What shall I do with CCDs?

Oh, you're trying to compensate for the "How much of a liar is the guy
writing the data sheet" factor. Varies by manufacturer and your skill
as an engineer.

 

[John Woodgate]

I read in sci.electronics.design that Ian Stirling

There are various meanings of 'derate'.

Technician 1 --> Technician 2. (8-O(

 

[Keith Williams]

Derate what?
In general, various factors can be reduced, to mitigate the effects
of external conditions, or to increase reliability.
Run a power transistor at lower temperature than the absolute limit, and
it'll last longer.
Run a CPU at a lower clock rate, and voltage, and it'll produce
less heat.
...
There are various meanings of 'derate'.

"Ian, you ignorant slut." ;-)
[/QUOTE]