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Simulators >> Circuit Simulators >> passive device modelling in HSPICE
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Message started by OpAmp on Jan 5^th, 2006, 10:12pm

Title: passive device modelling in HSPICE
Post by OpAmp on Jan 5^th, 2006, 10:12pm

Hi,

How can I define a passive element in HSPICE with the following impedance: 1/(Y(j*2*pi*f)^0.5) where Y is a constant and f is frequency. Note that this is an impedance of a Warburg element. It is very similar to the impedance of a capacitor but it is inversely proportional to the root-squared of frequency.

Thanks
OpAmp

Title: Re: passive device modelling in HSPICE
Post by Geoffrey_Coram on Jan 6^th, 2006, 5:18am

I'd suggest you read through this document http://www.designers-guide.org/Modeling/ind.pdf on modeling skin effect, which also has a non-integral power of frequency, to see what sorts of things you may have to consider.

Title: Re: passive device modelling in HSPICE
Post by Ken Kundert on Jan 9^th, 2006, 1:38pm

You'll also want to take a look at the fracpole program in http://www.designers-guide.org/Modeling/fracpole.zip.

-Ken

Title: Re: passive device modelling in HSPICE
Post by Andrew Beckett on Jan 9^th, 2006, 10:34pm

Not that this answers the original poster's question, but just a note that fracpole is now (since MMSIM60) a built in component in spectre. See spectre -h fracpole for more details.

Regards,

Andrew.