Derating CCD detectors

C

ChrisNeumi

Guest
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?
 
ChrisNeumi wrote:

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?
Click to expand...
Trying to image a guy in a striped purple suit?

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com
 
Tim Wescott <tim@wescottnospamdesign.com> wrote:
ChrisNeumi wrote:

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?
Click to expand...
I'm guessing radiation.
 
Ian Stirling <root@mauve.demon.co.uk> wrote in message news:<42404ff4$0$16010$ed2619ec@ptn-nntp-reader02.plus.net>...
Tim Wescott <tim@wescottnospamdesign.com> wrote:
ChrisNeumi wrote:

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?

I'm guessing radiation.
Click to expand...
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?
 
ChrisNeumi <ChrisNeumi@gmx.de> wrote:
Ian Stirling <root@mauve.demon.co.uk> wrote in message news:<42404ff4$0$16010$ed2619ec@ptn-nntp-reader02.plus.net>...
Tim Wescott <tim@wescottnospamdesign.com> wrote:
ChrisNeumi wrote:

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?

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?
Click to expand...
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'.
 
I read in sci.electronics.design that Ian Stirling
<root@mauve.demon.co.uk> wrote (in
<4242eb21$0$94485$ed2619ec@ptn-nntp-reader01.plus.net>) about 'Derating
CCD detectors', on Thu, 24 Mar 2005:

There are various meanings of 'derate'.
Click to expand...
Technician 1 --> Technician 2. (8-O(
--
Regards, John Woodgate, OOO - Own Opinions Only.
There are two sides to every question, except
'What is a Moebius strip?'
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
 
In article <4242eb21$0$94485$ed2619ec@ptn-nntp-reader01.plus.net>,
root@mauve.demon.co.uk says...
ChrisNeumi <ChrisNeumi@gmx.de> wrote:
Ian Stirling <root@mauve.demon.co.uk> wrote in message news:<42404ff4$0$16010$ed2619ec@ptn-nntp-reader02.plus.net>...
Tim Wescott <tim@wescottnospamdesign.com> wrote:
ChrisNeumi wrote:

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?

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?

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'.
Click to expand...
"Ian, you ignorant slut." ;-)

--
Keith
>
 
ChrisNeumi wrote:
Ian Stirling <root@mauve.demon.co.uk> wrote in message news:<42404ff4$0$16010$ed2619ec@ptn-nntp-reader02.plus.net>...

Tim Wescott <tim@wescottnospamdesign.com> wrote:

ChrisNeumi wrote:


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?

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?
Click to expand...
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.
 
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