Dong, bypass capacitance: in the die, as part of the PCB assembly and/or the the IC package is all that can save you from the evils of inductance. The DC/DC converter and its output capacitors becomes largely irrelevant by about 1MHz. Steve Dong Kim wrote: > My bottom-line effort is: > trying to minimize inductance between power source and a very high speed > switching component (multiple Ghz). > The 1 oz. power plane size is approximately 14”x12”. > The distance between the DC/DC power source to high speed switching IC is > about 6 inches. > The IC’s internal 256bit bus switching speed is greater than 3Ghz. > > I am concerned about the high speed noise generated by the IC switching > feedback into the power source. > As the signal switching speed gets faster, I heard not only the skin effect > kicks-in but also the signal tends to flow straight, forming a narrow strip > path on the conductor sheet. > If the signal only flows thru the narrow strip of conductor, major portion > of the large sheet of conductor is no longer a good conductor for the noise. > It may just become an inductor in the high speed noise perspective. In > another word, the large sheet of conductor is useless for the effort of > minimizing inductance. > Let me know if I am understood the concept straight. > > Please advice me with your expert opinion. > > Thanks > > Dong Kim > > > --------------------------------- > Be a better Heartthrob. Get better relationship answers from someone who > knows. > Yahoo! Answers - Check it out. > > ------------------------------------------------------------------ > 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: > http://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: > http://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: http://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: http://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