On Wed, May 22, 2013 at 11:59:23AM +0200, Orestes Mas wrote:
> I'm obtaining unexpected results (NaN) when simulating a simple circuit:
>
> [..]
> Rpb 3 4 0K
> [..]
>
> Test circuit
> #Freq vdb(5)
> 0.1 NaN
> 0.10046 NaN
> 0.10093 NaN
> 0.10139 NaN
> 0.10186 NaN
> 0.10233 NaN
Hi Orestes.
the problem is, that unlike D_RES::tr_begin, D_RES::ac_begin does not
handle zero resistance very well. NaN is caused by the zero division.
as a workaround you may want to write
> Rpb 3 4 10n,
10n is the default for OPT::short.
this should be fixed together with the following bug:
void ELEMENT::precalc_last()
{
COMPONENT::precalc_last();
//BUG// This is needed for AC analysis without doing op (or dc or tran ...)
first.
// Something like it should be moved to ac_begin.
if (_sim->is_first_expand()) {
_y[0].x = 0.;
_y[0].f0 = LINEAR;
_y[0].f1 = value();
}else{
}
}
regards
felix
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