[Orcnet] 165C -- anybody got _really_ high temp circuit experience?

[Tim Wescott]

I'm looking for a warm body, not cold theory.

Current commercial practice is to use parts rated for the temperature 
where possible, and otherwise use off the shelf parts that have been 
re-specified as necessary to work.  Vacuum tubes are not used, to my 
knowledge, nor are super-custom silicon carbide ICs.  Instead, people 
buy lots of parts from lots of manufacturers, and test them out at 
elevated temperatures to see which ones actually work.

On 10/22/2010 10:54 AM, Brian Conley wrote:
> Related Sidebar Information:
> Back in 1984 when I was taking my comprehensive exam for my masters I was asked
> several questions about triodes.
> This surprised me because all of my physical device theory up to that point had been
> solid state.
> The reason I was asked is that University of Arizona had some sort of grant
> from an undisclosed agency to develop "Thermionic Integrated Circuits",
> essentially chip vacuum tubes or vacuum tubes on a chip.
> The reasons were for the conditions you describe.
> Perhaps this can give you two other things to search on.
> (U of A&  Thermionic ICs)
>
> -----Original Message-----
>    
>> From: Steve Wetterling<stevewetterling at comcast.net>
>> Sent: Oct 22, 2010 10:02 AM
>> To: 'Tim Wescott'<tim at wescottdesign.com>, 'orcnet'<orcnet at eeconsult.org>
>> Subject: Re: [Orcnet] 165C -- anybody got _really_ high temp circuit	experience?
>>
>> The Anadigm switched capacitor analog signal processor IC is represented to
>> be particularly well suited to high temp environments like this based on
>> existing successful applications.  What kind of analog frequencies are being
>> talked about?  The Anadigm technology is good for milli-Hertz bandwidths at
>> very low frequencies.
>>
>> Please tell me more.
>>
>> Steve Wetterling
>> Cell 503-860-5594
>>
>>
>> -----Original Message-----
>> From: orcnet-bounces at eeconsult.org [mailto:orcnet-bounces at eeconsult.org] On
>> Behalf Of Tim Wescott
>> Sent: Friday, October 22, 2010 9:49 AM
>> To: orcnet
>> Subject: [Orcnet] 165C -- anybody got _really_ high temp circuit experience?
>>
>> I've got a prospect who wants some work done, combining software,
>> hardware, and signal processing.  The business end of this is going to
>> be down in an oil well, where things are hot.  It needs to work at 150C,
>> and he likes to test things at 165C.  Furthermore it's attached to a
>> drilling head, so it's a high vibration/shock environment.  There are a
>> lot of kinks and quirks to this (not least of which is using off the
>> shelf components well beyond their maximum ratings).
>>
>> I'm figuring that I'll be doing the signal processing and possibly the
>> firmware.  But I don't think the customer is going to be eager to pay me
>> to learn how to do the high-temp circuit design.  So if you have similar
>> high temperature circuits experience, or if you know someone who has,
>> let me know or point them to me.
>>
>> Thanks in advance.
>>
>> -- 
>> Tim Wescott
>> Wescott Design Services
>> Voice: 503-631-7815
>> Cell:  503-349-8432
>> http://www.wescottdesign.com
>>
>>
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>
> Brian Conley, PE
> Circuitsville Engineering LLC
> www.circuitsvilleeng.com
> Voice -  503-530-6520
> FAX - 503-574-2066
> bconley at circuitsvilleeng.com
>
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>    


-- 
Tim Wescott
Wescott Design Services
Voice: 503-631-7815
Cell:  503-349-8432
http://www.wescottdesign.com