[SI-LIST] Re: I have a question related package parasitic extraction
- From: Jayaprakash <edpc108@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Tue, 9 Dec 2003 14:11:09 +0000 (GMT)
Hello Patrick,
Then the same argument should hold good even for
Transmission line model described using telegrapher's
equation?
By telegrapher's equation, Transmission line has
uniform RLGC per unit length. The output voltage is
given by
Vo = exp(-gamma*Line_length)*vin (for a perfectly
matched system)
Is this description of Transmission line not really
scalable? (Going by the explanation given below, I
expect over projection of loss for longer lines than
actually it is)
Thanks and regards,
Jayaprakash.
--- Patrick Zilaro <pzilaro@xxxxxxxxxxxx> wrote: >
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.
=====
Balachandran Jayaprakash
Celestijnenlaan,
3/61, 3001, Heverlee,
Leuven, Belgium.
Mobile: +32-472-630120
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