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Flipped bits

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Conundrum
Sun Jun 27 2010, 10:52AM Print
Conundrum Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062
Link2

heh.. you'd think that the new multi-GB chips would be more sensitive to this.

Interestingly it seems that ESD can cause very similar problems, for example making a chip more sensitive to temperature rises etc.

Having had at least one failed RAM chip (worked fine for months then PC kept BSOD'ing) I wonder if it was damaged when originally installed at the factory.. ?

when i get time i might try and run a read/write algorithm on a '4164 RAM chip to see how many bit flips a known radiation source causes.

-A
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Proud Mary
Sun Jun 27 2010, 11:40AM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
There is an interesting report on the appearance of radiation-induced white blemishes in CCD cameras here:

TH-1087 Date: 12/21/01

Link2

and a rather good, if basic, multi-part guide here:

Radiation Hardening in Electronics

Link2

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MinorityCarrier
Mon Jun 28 2010, 12:24AM
MinorityCarrier Registered Member #2123 Joined: Sat May 16 2009, 03:10AM
Location: Bend, Oregon
Posts: 312
I had a Canon EOS10D SLR camera purchased in 2003 that developed lit pixels with long exposures, and I still have a Sony VX2000 DV that started displaying a single lit pixel when the camera was used on a hot day. Wonder if these are radiation-induced.
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Proud Mary
Mon Jun 28 2010, 06:35PM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
MinorityCarrier wrote ...

I had a Canon EOS10D SLR camera purchased in 2003 that developed lit pixels with long exposures, and I still have a Sony VX2000 DV that started displaying a single lit pixel when the camera was used on a hot day. Wonder if these are radiation-induced.

It would seem quite possible according to TH-1087, wouldn't it, but I s'pose there's no way of establishing that any particular blemish occurred in this way, which may well be a tempting let-out for careless quality controllers.
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