Embedded Systems Conference
Breaking News
Comments
Newest First | Oldest First | Threaded View
Bill_Higdon
User Rank
Author
Re: Too cool, literally?
Bill_Higdon   9/4/2013 7:54:39 PM
NO RATINGS
I worked at Moxtek in Orem Utah for a period of time in the lat 90's, they build low noise JFETs, assemblies containing the JFETs and other items for XRF (X-ray Fluorescence) equipment. When the JFET assemblies are operating they're cooled to a temperature close to liquid nitrogen the only reason they're not at the same temperature as the liquid nitrogen is they have a tiny heater that keeps them at their optimal operating temperature. When  not operating & turned off their temperature gets very close to the tempo of the liquid nitrogen. One of the tests I had to run was on some Honeywell Mil-Spec IR LEDs, was simulating the cold /hot cycles the equipment would go through. The diodes had to with stand being dunked into liquid nitrogen for a specified number of times. I looked at putting together a mechanical dunker for the tests, and decided I could get it done faster by doing it by hand. While the Diodes passed with flying colors any temperature color shift didn't make them visible.

Bill


kfield
User Rank
Author
Too cool, literally?
kfield   9/4/2013 3:50:02 PM
NO RATINGS
I really appreciate the irony in this comment on his website "When overclocking desktop processors one should be careful not to cool capacitors below 0°C even if it would require additional heating." 



Radio
NEXT UPCOMING BROADCAST

As we unveil EE Times’ 2015 Silicon 60 list, journalist & Silicon 60 researcher Peter Clarke hosts a conversation on startups in the electronics industry. Panelists Dan Armbrust (investment firm Silicon Catalyst), Andrew Kau (venture capital firm Walden International), and Stan Boland (successful serial entrepreneur, former CEO of Neul, Icera) join in the live debate.
Most Recent Comments
Flash Poll
Top Comments of the Week
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
Special Video Section
The LTC®4015 is a complete synchronous buck controller/ ...
10:35
The LT®3042 is a high performance low dropout linear ...
Chwan-Jye Foo (C.J Foo), product marketing manager for ...
The LT®3752/LT3752-1 are current mode PWM controllers ...
LED lighting is an important feature in today’s and future ...
Active balancing of series connected battery stacks exists ...
After a four-year absence, Infineon returns to Mobile World ...
A laptop’s 65-watt adapter can be made 6 times smaller and ...
An industry network should have device and data security at ...
The LTC2975 is a four-channel PMBus Power System Manager ...
In this video, a new high speed CMOS output comparator ...
The LT8640 is a 42V, 5A synchronous step-down regulator ...
The LTC2000 high-speed DAC has low noise and excellent ...
How do you protect the load and ensure output continues to ...
General-purpose DACs have applications in instrumentation, ...
Linear Technology demonstrates its latest measurement ...
10:29
Demos from Maxim Integrated at Electronica 2014 show ...
Bosch CEO Stefan Finkbeiner shows off latest combo and ...
STMicroelectronics demoed this simple gesture control ...
Keysight shows you what signals lurk in real-time at 510MHz ...