[SI-LIST] How to handle RLGC matrix in w-element?

From: Janice Chen <pollychen58@xxxxxxxxx>
To: si-list@xxxxxxxxxxxxx
Date: Tue, 10 Jan 2012 14:28:33 +0800

Dear friends,
I am working on converting w element to S parameters. First I have to
handle the RLGC matrix. That is, originally the diagonal in C matrix Cii
equals the sum of Cig and Cik, therefore value Cik must be removed.
My question is, how about the G matrix? The off diagonal terms in G matrix
might be positive or negative, how could I subtract Gik from Gii to get Gig?
I think there is no need to do the same action for R and L matrix, is it
correct? (Because they are series components in distributed transmission
line model.)
Currently, my program works for 1 conductor case (2 ports), and it had good
correlation with the S parameter extracted by using p-element in spice, but
it is wrong when trace number geater than 1. I think the problem is the
RLGC matrix handling, since when trace number greater than 1, mutual terms
present.


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[SI-LIST] How to handle RLGC matrix in w-element?

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