FreeLists / si-list / [SI-LIST] Re: How to get RLC matrix from spice model

["Jason R. Miller" <Jason.R.Miller@xxxxxxx>]

Tadashi,

The F element is used in Q3D to handle coupling, similar to the K 
element. The F element in Spice corresponds to a current-controlled 
current source. The syntax is

Fname N1 N2 Vsource gain

where N1 and N2 are the positive and negative reference nodes for the 
dependent source, Vsource is the name of the independent voltage source, 
and the gain is the ratio of the current in the controlled source to 
that of the controlling voltage source. The independent voltage source 
is often chosen to be a zero-valued source. This is equivalent to an 
ideal short circuit. The zero-valued voltage source can then serve as an 
ideal ammeter in series with an inductor. The gain of the current 
controlled current source elements are then adjusted to model the mutual 
inductances based on the ratio of Lij/Lii. The sign of the gain can be 
either positive or negative. This fact can be used to create negative 
mutual inductances.

If you can't go back and get the RLC matrix directly from the vendor, I 
thought this info might be a good starting point for obtaining the 
matrix from the Spice model.

Thanks
Jason


Arai, Tadashi wrote:
> Gurus,
>  
> Can someone tell me how to extract RLC matrix from connector spice
> model?
>  
> I am trying to extract RLC matrix of a connector from a vendor spice
> model crated by Q3D. It was easy for me to get R matrix (only diagonal
> part) and C matrix, however, L matrix seemed a little complex.
> The spice model has L-elements which were diagonal part. And it seems to
> be able to calculate the off-diagonal part of L matrix from K-elements;
> Lij = Kij * SQRT(Lii * Ljj). But how to handle the F-elements? That is
> my question.
>  
> Regards,
> ---- 
> Tadashi ARAI / MTS Application Engineer 
> Hardware Support Engineering, Customer Support Services 
> Japan Engineering Lab., AMD Japan Limited 
> +81-3-3346-7687 / +81-3-3342-5196 (fax) 
>
>  
>
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