All, If your simulation has perfect grounds then it may not capture the resonances that are in the real system which has imperfect grounds with holes, irregularities etc. John At 02:00 PM 11/4/2004 -0500, Andrew Ingraham wrote: >> Another thing to consider is the ability to capture system resonances in >> your >> simulation. If you are trying to evaluate the system over a wide range of >> frequencies >> in order to understand where the resonances are, then I think that a >> time-domain >> simulator is a much better choice. Using a frequency-domain simulation >> engine >> is going to require that you choose your frequencies correctly. Murphy's >> law >> says that system resonant frequencies are going to be something other than >> what >> you've chosen. > >In this case, it's probably the other way around (if you even could simulate >the DDS circuit in the frequency domain, that is). > >Frequency domain analysis lets you step through several frequencies >relatively quickly. While they are still discrete steps (leaving gaps), >it's easy to do lots of them quickly. > >The output of a DDS is a sinusoid, so in the time domain you get to check >only one frequency at a time ... slowly. > >Regards, >Andy > > >------------------------------------------------------------------ >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 FAQ wiki page is located at: > http://si-list.org/wiki/wiki.pl?Si-List_FAQ > >List technical documents are available at: > http://www.si-list.org > >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 > ------------------------------------------------------------------ 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 FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org 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