[SI-LIST] Re: DC resistance calculation of returen path_equivalent width?
- From: "John Lin (???)" <John@xxxxxxxxxxxx>
- To: <sghsu55@xxxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Tue, 5 Nov 2002 13:24:44 +0800
Sogo,
Nice to hear you again on this list.
if the DC resistance is what you mentioned, then the whole ground plane =
will be your return path. For low frequency, the return current =
distributes widely all over the ground plane.=20
Best Regards,
John Lin
Quanta Computer Inc.,Taiwan, R.O.C.
Email: John@xxxxxxxxxxxx
Tel: 886+3+3272345 ext. 5183
-----Original Message-----
From: Sogo Hsu [mailto:sghsu55@xxxxxxxxxxxx]
Sent: Monday, November 04, 2002 10:22 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] DC resistance calculation of returen path_equivalent =
width?
Hi SI gurus,
I have a question regarding DC resistance calculation of return=20
current path. It is said the return current path would be the least-
length path between driver and receiver. At this moment, I would like=20
to estimate the required trace with to match voltage drop spec, for=20
instance, USB 2.0. For conductor signal trace, the DC resistance=20
would be
Rho * L/ (W*t),=20
but what=3DA1=3DA6s the equivalent width for return path? Thank you in=20
advance.=20
Best regards,
Sogo Hsu
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