[SI-LIST] Re: Split gnd planes - for/against?
- From: Scott McMorrow <scott@xxxxxxxxxxxxx>
- To: "Kevin G. Rhoads" <kgrhoads@xxxxxxxxxxxx>
- Date: Wed, 08 Apr 2009 14:43:39 -0400
Kevin
I'd agree with you. The key to using models and simulation is to
correlate the results with measurements, closing the loop.
Kevin G. Rhoads wrote:
>> If building multiple prototypes gets you through your day that's fine.
>> It is something we work hard to avoid the need for. The tools exist to
>> evaluate pretty much anything we want to know about layout performance
>> before we commit to fab.
>>
>
> I started out with an S.B. in theoretical mathematics, before switching
> to EE for grad. school. I've done theoretical analyses, numerical
> analyses (both with commercial and with homebrew codes) as well as building
> stuff.
>
> Simulation and analysis tools are great. But I've seen too many cases where
> reality is different enough that I don't trust predictions. That may be
> because all too often I am working with projects that are extreme in one
> way or the other. (E.g., mMeasuring conductivity of molten glass [+/-0.5%],
> dielectric constant of cryogenic organic solvent mixtures, things that
> involve
> dual electrometers, and more recently ion and electron detectors for rockets
> (those are actually fairly straightforward).)
>
> So it may be that my experience is non-typical enough not to be a good
> guideline, but I don't trust simulations. I've had too many
> cases where some critical parasitic or minor effect is not modelled
> well enough and the simulation and the reality are more orthogonal
> than similar.
>
> So just call me "once bitten, twice shy"
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Scott McMorrow
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