# [SI-LIST] Current Return Vias

*From*: Kenny Frohlich <kenny_frohlich@xxxxxxxxx>*To*: si-list@xxxxxxxxxxxxx*Date*: Sat, 22 Jul 2006 06:45:56 -0700 (PDT)

Dear Experts, I understand that I need to provide ground vias next to via explictly for the purpose of letting return currents jump between layers. I know it's a requirement for high speed signals, especially differrential signals. Is this also required for low speed single-ended signals (133Mhz or slower)? If this is a requirement, what would be a good signal via to ground via ratio? For example, there are five signal vias within a 1 inch area, how many ground vias do I need? Thank you Kenny __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ------------------------------------------------------------------ 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 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: 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

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