Re: [Help-gnucap] gnucap error

[Ramiro Aceves]

Yes Andy, you are right. Thanks for the tip!
I seems that gnucap confuses part instance with model if name is the same.
I have changed to:

DV1      501     0       Dvnoise

Then gnucap showed same error for de DInoise diodes

I changed to:

DI1             502     0       DInoise1
DI2             503     0       DInoise2

Now the error about the diodes disappeard. I can enter gnucap and have 
the warnings:

$ gnucap prueba_ada4898.cir
Gnucap 0.35
The Gnu Circuit Analysis Package
Never trust any version less than 1.0
Copyright 1982-2006, Albert Davis
Gnucap comes with ABSOLUTELY NO WARRANTY
This is free software, and you are welcome
to redistribute it under certain conditions
according to the GNU General Public License.
See the file "COPYING" for details.
*prueba del ADA4898
Rc1.X1: Rideal: effective length is negative or zero
Rc2.X1: Rideal: effective length is negative or zero
Re1.X1: Rideal: effective length is negative or zero
Re2.X1: Rideal: effective length is negative or zero
Rcm1.X1: Rideal: effective length is negative or zero
Rcm2.X1: Rideal: effective length is negative or zero
Rcmr1.X1: Rideal: effective length is negative or zero
Rcmr2.X1: Rideal: effective length is negative or zero
Rpsr1.X1: Rideal: effective length is negative or zero
Rpsr2.X1: Rideal: effective length is negative or zero
Rpsr3.X1: Rideal: effective length is negative or zero
Rpsr4.X1: Rideal: effective length is negative or zero
Rslew.X1: Rideal: effective length is negative or zero
Rp1.X1: Rideal: effective length is negative or zero
Rp2.X1: Rideal: effective length is negative or zero
Rp3.X1: Rideal: effective length is negative or zero
Rp4.X1: Rideal: effective length is negative or zero
Rp5.X1: Rideal: effective length is negative or zero
Rz1.X1: Rideal: effective length is negative or zero
Rz2.X1: Rideal: effective length is negative or zero
Rz3.X1: Rideal: effective length is negative or zero
Rbuf.X1: Rideal: effective length is negative or zero
Rout.X1: RIDEAL: effective length is negative or zero
Rref1.X1: Rideal: effective length is negative or zero
Rref2.X1: Rideal: effective length is negative or zero
gnucap>

When I simulate the circuit I get:

gnucap> tran

#Time
open circuit: internal node 54
did not converge
 0.
very backward time step
convergence failure, reducing (itl4)
newtime=9.155273e-13  rejectedtime=1.831055e-12  oldtime=0.000000e+00 
using=1.000000e-12
tried everything, still doesn't work, giving up
gnucap>

Do not know what node is 54, I cant find it in the circuit.

Thanks for your help.

Ramiro.








El 06/07/11 23:40, Andy Fierman escribió:
> I'm not experienced with Gnucap so please excuse me if this is nonsense.
>
> Is the
>
> DVnoise.X1, Dvnoise is not a .model
>
> part of the error message is trying to tell you that the line under
>
> ***Voltage Noise Generation
>
> DVnoise 501     0       Dvnoise
>
> is confusing the parsing process (not sure if that's the right
> terminology but I hope you get the idea)?
>
> Maybe the net name "DVnoise" at the start of the line is being read as
> the diode component "Dvnoise". This could cause a problem.
>
> If Gnucap is case sensitive when reading netlists then a component
> called DVnoise would not be the same as Dvnoise and so the .model
> Dvnoise would not be seen as applying to the wrongly identified
> DVnoise component.
>
> Cheers,
>
>           Andy.