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Kristen Villemez

Jupiter: The IC Danger Zone, Part 1

Kristen Villemez
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kristen.villemez
kristen.villemez
8/19/2016 10:44:07 AM
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Re: Gamma rays = electrons?
This was my mistake, thank you for pointing it out. I mixed up Beta and Gamma rays, but the implications remain the same. In both cases, there are extra charges present which affect device performance. The photons excite electrons to a higher energy state, making them more mobile (and leaving holes behind in the process).

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Andy_I
Andy_I
8/17/2016 9:30:01 AM
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Gamma rays = electrons?
> than gamma rays, which consists of just electrons.

Gee, when I was in school, they taught us that Gamma rays were pure radiation (in the E-M spectrum) which would make them photons, and did not consist of electrons.

OTOH, a flow of electrons from radioactive decay was what they called Beta "rays" (or Beta particles).

Were they wrong, all this time?

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kristen.villemez
kristen.villemez
8/11/2016 9:57:34 PM
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Re: Jupiter vs Earth-orbit-based parts spec regime
@dick_freebird, These are all excellent points and I appreciate the great input. One of the points I was attempting to get across in this post is no matter how qualified or even over-qualified a device is for earth orbit, most ICs don't stand much of a chance once completely outside of the earth's atmosphere without extra protection. Certainly not in such close proximity to Jupiter. The standards of radiation testing that are outlined for QML-V devices does provide a great springboard for discussion with those with limited experience.

I think that if a device doesn't pass some half-decent minimum that not many customers will buy the product anyway unless it offers something which nothing else on the market does and is valuable. Of course DLA doesn't care much about single event effects, but many customers do, if only to be aware that they exist. I do find SEFI effects to be the most intriguing of all the radiation effects, since solutions to the problems they create are not solely tied to process technology and IC design.

I've seen a few times where the device release has missed the design-in window, so the loss can definitely go both ways. Though with more and more private companies such as SpaceX engaging in space exploration that narrow window is beginning to be less and less of an issue. It is certainly one of the more unique aspects of the space industry.

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steve.taranovich
steve.taranovich
8/11/2016 6:19:14 PM
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Re: Jupiter vs Earth-orbit-based parts spec regime
@dick_freebird, I value audience members like yourself and your inouts with such a solid tech background. I get where you are coming from in your comments now---thanks

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dick_freebird
dick_freebird
8/11/2016 6:14:54 PM
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Teacher
Re: Jupiter vs Earth-orbit-based parts spec regime
Since you ask, I've been an IC designer doing product and technology development for rad hard parts all of my 30+ year professional career, and I've got a pretty good grasp of the environment in all its aspects. Especially the hard slog of introducing a new part with a narrow demand base and how often the market plan, not the part, fails.

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steve.taranovich
steve.taranovich
8/11/2016 12:04:32 PM
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Re: Jupiter vs Earth-orbit-based parts spec regime
@dick_freebird, I thank you for your insights, but your last comment seems a bit bitter to me. 

"And of course at about one flight per decade, there's a sizzling market for you. Especially if your product is used one per system."


Have you had bad experiences with space-qualified parts or are you against space exploration?

Think about how much electronics are on board Juno to get it to fly over 500 million km to Jupiter, enter a precise orbit pattern in order to not burn up, then orbit that Planet Jupiter for more than 18 months while employing numerous electronic systems onboard to study and explore the planet......That's a lot of electronics!! I'll bet that ADI has lots more than just one IC on Juno, even if you just consider the redundancy of ICs needed on a mission like this.

Plus, it's not always all about the money semi companies like ADI make on a rad hard IC. or selling NASA lots of space qualified, or in this case very Rad Hard ICs. It's about being a part of the adventure of exploration.

In case you are concerned with the money we spend in space, NASA/JPL Caltech recently retired director, Charles Elachi, recently told me that NASA does not spend money in space, it spends money on Earth with the equipment and ICs it buys for its programs, as well as employing the people that NASA have on projects such as Juno, and the money it pays for contractors to help develop amazing technological engineering designs, .......... That's a great deal of investment right here on our planet.

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dick_freebird
dick_freebird
8/10/2016 9:57:28 PM
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Jupiter vs Earth-orbit-based parts spec regime
Talking about DLA qualification really has nothing much to do with parts for Jovian missions. DLA does not set a radiation hardness requirement for any part, but lets the manufacturer rate it (you can find QML-V parts with 10KRad or 1MRad HDR specs). The protons will kill bipolar parts and DLA has no care for protons really. Parts with neutron ratings may get "special attention" viz ITAR and hardly anyone rates those as a result (ditto high gamma dose rate tolerance). DLA also has little care for single event effects outside of latchup.


I've never seen a part datasheet that says 20MRad (or ten, or for that matter anything above 1MRad and those are few).

And of course at about one flight per decade, there's a sizzling market for you. Especially if your product is used one per system.

 

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