Re: effect of xray on fpga electronic circuits

Jan 18, 2008 6 Replies

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krw 18 years ago

Dear All,

> As an assignment I have to design a CCD Sensor based FPGA digital
> Camera. However, the Camera will be exposed to XRAY (It will be placed
> behind an Imaging Intensifier). Does anybody know how XRAY affects the
> electronic circuits (The CCD Sensor and the FPGA ). What type of noise
> should I expect and what should I do to prevent it.
> Thanks in advance

CMOS doesn't like X-Rays much. There is a failure mechanism that tends to harden CMOS SRAM bits in one direction. I'm not sure how bad it gets though.

Keith

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Pillock 18 years ago

On Thu, 17 Jan 2008 21:14:46 -0500, in sci.electronics.basics, krw gurgled:

THE HORRORS!

Someone need to tell Agilent & Teradyne ASAP. Millions of boards a year are run through their x-ray fault detection systems.

Digital boards quite often with memory.

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Wim Lewis 18 years ago

There's a heck of a big difference between running a board through an xray machine a few times, and having that board run for a long time being exposed to xrays of uncertain energy while it's operating.

Wim Lewis , Seattle, WA, USA. PGP keyID 27F772C1

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Pillock 18 years ago

On Sun, 27 Jan 2008 01:15:36 +0000 (UTC), in sci.electronics.basics, Wim Lewis bloviated:

And just what are those parameters? What level is safe? What level is damaging? Length of time with respect to *energy* level? Frequency domain? Studies to support that data?

Don't leave everyone hanging:

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MikeShepherd564 18 years ago

It's OK to leave me hanging. Like most people, I don't care much about the effects of X-rays. My equipment isn't subjected to any significant intensity, because it's not X-rayed while in use, nor is it likely to go into space.

If you're so interested, why not research it yourself?

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Pillock 18 years ago

On Mon, 28 Jan 2008 14:58:32 +0000, in sci.electronics.basics, snipped-for-privacy@btinternet.com bloviated:

Ah, so you didn't quite catch the quite obvious drift of the questions.

Here is a little research for you, look up the term FUD.

Follow that with "saccharine in rodents".

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Terry Given 18 years ago

better yet, look up "fundamentals of nuclear hardening of electronic equipment", L. W. Ricketts, Krieger pub.

Cheers Terry

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