Sounds really dated and old school, but.... check twice and cut once. It always takes longer to fix a hardware problem than to just make sure it isn't there. Actually alot less expensive too. -Mike. On Wed, Apr 8, 2009 at 1:43 PM, Scott McMorrow <scott@xxxxxxxxxxxxx> wrote: > 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" > > ------------------------------------------------------------------ > > To unsubscribe from si-list: > > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field > > > > or to administer your membership from a web page, go to: > > //www.freelists.org/webpage/si-list > > > > For help: > > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field > > > > > > List technical documents are available at: > > http://www.si-list.net > > > > List archives are viewable at: > > //www.freelists.org/archives/si-list > > or at our remote archives: > > http://groups.yahoo.com/group/si-list/messages > > Old (prior to June 6, 2001) list archives are viewable at: > > http://www.qsl.net/wb6tpu > > > > > > > > -- > Scott McMorrow > Teraspeed Consulting Group LLC > 121 North River Drive > Narragansett, RI 02882 > (401) 284-1827 Business > (401) 284-1840 Fax > > http://www.teraspeed.com > > Teraspeed® is the registered service mark of > Teraspeed Consulting Group LLC > > > > ------------------------------------------------------------------ > To unsubscribe from si-list: > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field > > or to administer your membership from a web page, go to: > //www.freelists.org/webpage/si-list > > For help: > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field > > > List technical documents are available at: > http://www.si-list.net > > List archives are viewable at: > //www.freelists.org/archives/si-list > or at our remote archives: > http://groups.yahoo.com/group/si-list/messages > Old (prior to June 6, 2001) list archives are viewable at: > http://www.qsl.net/wb6tpu > > > -- Best Regards, Michael C. Greim And all this science they don't understand Is just my job six days a week..... We will either find a way or make one -Hannibal In the middle of every difficulty lies opportunity -Al Einstein ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List technical documents are available at: http://www.si-list.net List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu