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