Rational Function Models, Recursive Convolution, Macromodel

[tw]

Hello!

Is there a way to interface Rational Function Matrix (.rfm) files from Xyce?

Thank you for your consideration!

[xyce-users]

Tw,

Do you mean the Rational Function Matrix (.rfm) files that are defined by HSPICE as a way to do S-parameter analysis?  If so then not directly. 

We have had requests to support Touchstone input/output file formats for doing frequency domain analyses.  So, this thread seems similar to that at least.

--the Xyce Team

[tw]

Hi Xyce Team,

sorry for not being specific.

I want to do a transient analysis.

I have a model of a multiport described by a rational function obtained using vector fitting [1].

So my multiport is described by poles and zeros, not discrete frequency samples.

I can synthesize an equivalent circuit of the rational function and run the transient analysis.

This is too time consuming for my circuits.

Instead, the macromodel can be interfaced by recursive convolution which is possible in hspice [2, p.60], also Spectre, Zuken Lightning/Design Force.

This should speed up the analysis.

Is there a way, directly or indirectly?

Thank you for your help!

[1] https://www.3ds.com/products-services/simulia/products/idem/?utm_source=redirect&utm_medium=web&utm_campaign=idemworks_products_idem

[2] http://www.ele.uri.edu/courses/ele448/HspiceRef/hspice_si.pdf