Unfortunately Lee forgot we can't do attachments on the list. I noodled around and found the tool on Altera's website:http://www.altera.com/technology/signal/power-distribution-network/sgl-pdn.html This looks very cool. Thanks for mentioning it, Lee! Alan Hilton-Nickel Oracle, Santa Clara, CA On 1/3/2011 9:44 AM, Lee Ritchey wrote: > Dong, > I have attached a PDS design program from Altera. Notice that it does not > include any ferrite beads. same kind of thing is available from Xilinx. > > Yes, old applications notes from both Altera an Xilinx said to use ferrite > beads. This was never good advice and has finally been taken from their app > notes, but not before may engineers got conned into using ferrite beads. > > Lee > > -------------------------------------------------- > From: "Dong Kim" <kimdongsik_us@xxxxxxxxx> > Sent: Monday, December 27, 2010 4:03 PM > To: "Lee Ritchey" <leeritchey@xxxxxxxxxxxxx>; "steve weir" > <weirsi@xxxxxxxxxx>; <si-list@xxxxxxxxxxxxx> > Cc: "Istvan Novak" <istvan.novak@xxxxxxx>; "liuluping 41830" > <liuluping@xxxxxxxxxx> > Subject: [SI-LIST] anlog and digital power plane isolation with ferrite bead > good idea? > > > ------------------------------------------------------------------ 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 Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu