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passive device modelling in HSPICE (Read 3322 times)
OpAmp
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passive device modelling in HSPICE
Jan 05th, 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
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Geoffrey_Coram
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Re: passive device modelling in HSPICE
Reply #1 - Jan 6th, 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.
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Ken Kundert
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Re: passive device modelling in HSPICE
Reply #2 - Jan 9th, 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
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Andrew Beckett
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Re: passive device modelling in HSPICE
Reply #3 - Jan 9th, 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.

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Andrew.
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