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Re: gEDA-user: encrytped models on gnucap or ngspice



Bummer :(

Fairchild offers some on-line tools for selecting and testing mosfet (and some other stuff as well).  Problem is, it's not my circuit and does not show what I am looking for.  I'm interested in THD performance of my entire circuit - something they can't provide.  I don't have the personal resources (or time) to build up a circuit, or circuits, for every device that is on my 'possible fit' list.  That's where the simulators shine, in this case.  Without the model, I won't purchase the part - it's that simple.

Anyway, I posed the question to Fairchild.  If they reply favorably, I'll post the answer here.

gene
----- Original Message -----
From: Stuart Brorson
Date: Friday, April 25, 2008 9:49 am
Subject: Re: gEDA-user: encrytped models on gnucap or ngspice
To: gEDA user mailing list

> > Can either of these simulators handle an encrytped model? �I have
> >some from fairchild that are hspice format, using ".prot
> FREELIB" ,
> >which is encrypted.
>
> The short answer is no.
>
> To expound on this answer, if the HSpice folks were to release details
> about their encryption algorithm, then we could implement
> reading of
> encrypted models in ngspice/gnucap. However, then you'd have no
> incentive to pay $$$ to purchase HSpice. Therefore, I doubt
> that the
> owners of HSpice (is it Cadence these days?) will every release the
> details of their encryption.
>
> What you could do is approach Fairchild and ask them for an
> unencrypted version of their model. They have no reason to disappoint
> a customer simply to keep the HSpice encryption algorthm sekrit, so
> unless they have a reason to hide their own IP in their model, I don't
> see why they would want to keep it encrypted.
>
> Stuart
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