[SI-LIST] Re: Capacitance Formula
- From: "Fabrizio Zanella" <fabrizioz@xxxxxxxxxxxx>
- To: <scott@xxxxxxxxxxxxx>, <sukhui@xxxxxx>
- Date: Tue, 5 Nov 2002 16:28:29 -0500
What is the preferred method by SI engineers for creating Wline models
for Hspice? Is it using the RLGC outputs of the Hspice internal field
solver or using an external field solver? Has anyone verified the
accuracy of the Hspice field solver?
Thanks and regards,
Fabrizio Zanella
Signal Integrity Engineer
Broadbus Technologies
fabrizioz@xxxxxxxxxxxx
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Scott McMorrow
Sent: Monday, November 04, 2002 2:05 PM
To: sukhui@xxxxxx
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Capacitance Formula
Suk Hui,
Personally, rather than trust the equations, I would use a commercially
available field solver to solve for the geometry. If you have Hspice,
you can use the built-in field solver to calculate just what you want.
Ultimately, individual values of L and C are fairly meaningless for a
package. What you want to know is the characteristic impedance of the
trace. Some low cost field solvers like Linpar will also give you what
you need.
regards,
scott
--
Scott McMorrow
Teraspeed Consulting Group LLC
2926 SE Yamhill St.
Portland, OR 97214
(503) 239-5536
http://www.teraspeed.com
Suk Hui Teh wrote:
>Hi,
>
>I am currently analysing some package design traces and
>I have come about a couple of microstrip traces where,
>0.1< W/H < 3.0
>
>What are the formulas for calculating capacitance, Zo and inductance
>for these type of traces?
>
>Many thanks,
>Suk Hui
>
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