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Subject: Re: pspice problem
NNTP-Posting-Date: Fri, 27 Dec 2002 17:33:25 GMT
Organization: AT&T Broadband
Date: Fri, 27 Dec 2002 17:33:25 GMT
Reiner Goetz wrote in part:
> I want to simulate a resistance depending of frequencies Rx=Rx(f).
> example: Rx=R/f
> I can't find any way to do this with spice.
Anything that is realizable is generally possible to model in spice.
Troubles building a model can sometimes be a red flag that the concept
for the model is too unrealistic. And if you are not at least
attempting to model reality then what's the point?
Specifically, what real world device has the characteristic you are
trying to model?
> I tried it with the current behaviour sources, but "f" as an Input
> (variable) is not possible.
To construct a non-linear resistor, one can set up a voltage dependent
current source as a non-linear function of its own terminal voltage.
I've never tried it, but believe a behavioral source's describing
function can include frequency. But even if you could, why would you
wish to model a non realizable component?
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