[SI-LIST] Re: laplace errors

Alicia,

you are likely to have a function in the Laplace-domain with poles in
the right-half of the complex plane. You should eliminate them, in order
to make your system stable and causal.
NB: I supposed that the system you describe with the Laplace element is
LTI (linear and time-invariant) and passive.

Hope it helps,
Luca



On Thu, 27 Mar 2003 09:48:13 -0500
"Ingraham, Andrew" <Andrew.Ingraham@xxxxxx> wrote:

> "Non-causal" means the output starts appearing before the input is
> applied.  Apparently the functions or data that describe your laplace
> element have a response that does this.
> 
> To make it "causal," you would need to add some delay to the element.
> But that doesn't necessarily fix the problem.
> 
> (Note: I haven't used laplace elements.)
> 
> Regards,
> Andy
> 
> 
> > I use ORCAD-PSpice 9.2, Can any body help me? I don't know the meaning
> > os this messages:
> > 
> > 
> > 49.901 percent of X_signo_ABM.E_LAPLACE1 impulse response is
> > non-causal.
> > 
> > 49.901 percent of X_signo_ABM.E_LAPLACE1 impulse response is
> > non-causal.
> > 
> > It should be delayed by at least 7.84424e-005 sec.
> > 
> > Thanyou for your help.
> > 
> > 
> > 
> 
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-- 
Luca Giacotto <lgiacott@xxxxxxxxx>

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