[SI-LIST] Re: I have a question related package parasiticextraction.
- From: "Patrick Zilaro" <pzilaro@xxxxxxxxxxxx>
- To: realbalm@xxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Mon, 8 Dec 2003 18:11:58 -0800
KD,
There is nothing wrong with the commercial solver. Even if you were to
simulate a planar structure such as a trace, you would see that the "parts"
do not add up to the "whole". For example, if you simulated a 5mm trace and
a 10mm trace using the exact same stack-up, etc. you would find the
following:
1) capacitance -> 2*5mm trace should be pretty equal to 10mm trace
2) (ac) resistance -> 2*5mm trace should be less than the 10mm trace
3) inductance -> 2*5mm trace should be even more less than the 10mm trace
This is because each segment of the structure interacts with the rest of the
segments. So be careful, when you break up a problem, especially since you
are introducing error on the optimistic side (where you usually would prefer
to be on the pessimistic side).
Regards,
Patrick
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of KD KIM
Sent: Monday, December 08, 2003 3:59 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] I have a question related package parasitic
extraction.
Dear all,
I have a question and be happy to write to you.
I have simulation the structure composed of only one bonding wire and one
lead,
using FEM commercial solver, Ansoft Spicelink like below for extraction
parasitic values,
R, L, and C.
I have simulated for below three cases.
1. the structure contained only one bonding wire
2. the structure contained only one lead
3. the structure composed of one wire and one lead
I think the value for case 3 equal to the values case 1 added case 2.
But the result was not. The difference was about 16% for the Resistance.
Of course, other parasitic values also have some differences considerably.
Is this difference resulted from the defect of the FEM commercial solver?
I want to know that what do you think about it?
Please reply to my e-mail.
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