Thanks for both posts Rolf.  I'll have a look.  I'm no Spice expert but if
some examples are there I can piece it together.

regards,

Tim Hutcheson
Research Associate
Institute for Human and Machine Cognition
University of West Florida
40 S. Alcaniz St.
Pensacola, FL 32501
USA
805-202-4461

-----Original Message-----
From: Rolf Molitor [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, August 21, 2002 1:58 PM
To: Protel EDA Forum
Subject: Re: [PEDA] Simulating with load transfer function


Tim,
the articles about modelling mechanical devices were from www.intusoft.com,
e.g. have a look at http://www.intusoft.com/articles/relaycd4.pdf. If you
search google and take the links you do not even have to register at
intusoft to view the documents.
BTW, have also a look at the math.lib in the protel sim.ddb.

Rolf Molitor
Ing.Buero i2e
Remscheid / Germany


-----Urspr ngliche Nachricht-----
Von: "Rolf Molitor" <[EMAIL PROTECTED]>
An: "Protel EDA Forum" <[EMAIL PROTECTED]>
Gesendet: Mittwoch, 21. August 2002 19:12
Betreff: Re: [PEDA] Simulating with load transfer function


> Tim,
> what about controlled sources ? With the nonlinear ones (BISRC and BVSRC)
> you can use mathematical functions to describe their behaviour. Combining
> some of them might get you the right transfer functions.
> Yes, you can write your own models or subcircuits (maybe using nonlinear
> sources) for special devices but you really have to know a little bit
about
> SPICE / XSPICE (and have proper literature). Unfortunately Protel gives
not
> much technical support for the simulator. I remember having seen models
for
> mechanical devices like motors and loudspeakers in SPICE but can't
remember
> where.
> It could have been at www.intusoft.com or  www.pspice.com (you may have to
> register to get into the support area and be aware that PSPICE is no
XSPICE
> simulator and has some functions of its own).
>
> Rolf Molitor
> Ing.Buero i2e
> Remscheid / Germany
>
>
> -----Urspr ngliche Nachricht-----
> Von: "Tim Hutcheson" <[EMAIL PROTECTED]>
> An: "peda" <[EMAIL PROTECTED]>
> Gesendet: Mittwoch, 21. August 2002 17:54
> Betreff: [PEDA] Simulating with load transfer function
>
>
> > I want to add the transfer function of my load to a simulation but can't
> > find a Protel simulation part that lets me do what I want.  I would
expect
> > to find a simulation part in the library that would let me use a table
> > lookup or a functional form.  Has anyone done this?  Perhaps I need to
> > create something like a Spice subckt to do this.  Has anyone done that?
> > This would be used to couple the mechanical response of the load to the
> > electrical circuit.
> >
> > Once I have the physical load modeled, I would want to do something
> similar
> > with the driving source, but as the compensation needed to equalize the
> > output by frequency.  This is pretty much the inverse of the load
function
> > but not exactly and the resulting function will determine a DAC lookup
> > compensation table.
> >
> > I may have completely overlooked something but I don't see how to do it
> > directly without resorting to spice programming.
> >
> > Any ideas much appreciated.
> >
> > regards,
> >
> > Tim Hutcheson
> > Research Associate
> > Institute for Human and Machine Cognition
> > University of West Florida
> > 40 S. Alcaniz St.
> > Pensacola, FL 32501
> > USA
> > 805-202-4461
> >
> >
> > ************************************************************************
> > * Tracking #: 86B90ED2BA1C79408118BE47018CEDDC805F5D1A
> > *
> > ************************************************************************

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