RE: Vcc power planes

Grasso, Charles (GrassC@LOUISVILLE.STORTEK.COM)
Fri, 20 Jun 1997 14:49:44 -0600

If the tree structure adds inductance (I'm not sure I understand what a
tree
structure is...) in series with the capacitor - then NO NO do NOT listen
to him!!
Charles Grasso
EMC Engineer
StorageTek
Tel:(303)673-2908
Fax(303)661-7115

>----------
>From: Bradley L. Mendenhall[SMTP:blm@bbt.com]
>Sent: Friday, June 20, 1997 1:37 PM
>To: si-list@silab.Eng.Sun.COM
>Cc: blm@bbt.com
>Subject: Vcc power planes
>
>
>Can anyone give me advice about using my power plane as a reference for
>high speed PC board traces? I have a colleague who claims this results
>in a noisy board and that you are better off connecting Vcc to chips using
>a tree type structure with bypass caps next to each Vcc pin. Every source
>I have read advocates using power planes as a reference plane or return
>path except for VERY high speed designs. Should I listen to him?
>
>Thanks,
>
>Brad
>
>----------------------------------------------------------------
>Brad Mendenhall blm@bbt.com
>BroadBand Technologies, Inc. Phone: (919)405-4682
>4024 Stirrup Creek Drive FAX: (919)544-5356
>Research Triangle Park, NC 27709-3737
>
>