jfor at quik.com
Sat Aug 14 13:52:40 UTC 2010
I have ALWAYS distrusted simulation and computer modeling. And I used to
teach the stuff. GIGO.
"Neither the voice of authority nor the weight of reason and argument are
as significant as experiment, for thence comes quiet to the mind."
> Simply a few stories I thought I would share.
> Simulate design. Use manufacturer's published models. Build design. Note
> differences. Call manufacturer. Answer - switched die three years ago, Ft
> is now " much better " ( now 3x old parts ).
> Odd they never mentioned that to people who work for the same company.
> Simulate design, Build design, verify design, ship it for a few years. Odd
> things start to happen. Look at some parts. Package looks different. Ask
> around..... Line got moved to other side of big ocean. Process got "
> tweaked" beta is now 4x what it was.
> Again all inside the same company. Both cases were excused by industry
> standard specs that had no upper limit.
> We had whole departments devoted to tracking this sort of stuff. It still
> happened on a regular basis. 30 years later the specs on the devices and
> their published models are still the " old version " ones.
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