Re: gEDA-user: Model problem?

[John Coppens <john@xxxxxxxxxxxx>]

On Thu, 21 Jul 2005 22:17:13 -0400 (EDT)
sdb@xxxxxxxxxx (Stuart Brorson) wrote:

> > Is there some elegant way to know the node numbers on beforehand (i.e.
> > without having to open the spice file and deduce them)? Maybe
> > assigning numbers or labels to the nodes on the schematic?
> 
> Just double click on the net, and assign the "netname" attrib to what
> you want to use.  Then, if you are netlisting with spice-sdb, the
> netname you assign will appear as the node name in the SPICE netlist.

Thanks Stuart!

Of course that works - except if the line segment is short, and the line
handles cover the entire line. Then you can't get to it.

For some reason, the libraries that came with gEDA didn't include njfet
symbols (nor nfet, pjfet, pfet etc). (looked in several of the libraries-
analog, etc) I edited a symbols, assigned D, S, G to the pins (as
pinlabel, and pinnumber), added pinseq numbers, tried to include it and
got:

  Invalid wanted_pin passed to get-nets [unknown]

The spice net file includes:

  QJ1 Vout 3 5 BF256C  (see? netnaming worked...)

The refdes is J?, set to J1 (as per the HOWTO), but the Q is added by
gnetlist. I suppose that's ok? Anyway, tried to run the circuit resulted
in:

Warning -- Level not specified on line "(beta=1.4m betatce=-.5 rd=1 rs=1
lambda=4.6m vto=-3.1            vtotc=-2.5m is=33.57f isr=322.4f n=1 nr=2
xti=3 alpha=311.7u             vk=243.6 cgd=2.132p m=.3622 pb=1 fc=.5
cgs=2.104p kf=23.06e-18  af=1)" Using level 1.

Error on line 19 : 
.model bf256c        njf(beta=1.4m betatce=-.5 rd=1
rs=1 lambda=4.6m vto=-3.1 vtotc=-2.5m is=33.57f
isr=322.4f n=1 nr=2 xti=3 alpha=311.7u  vk=243.6 cgd=2.132p
m=.3622 pb=1 fc=.5 cgs=2.104p kf=23.06e-18 af=1) 

        unrecognized parameter (betatce) - ignored
        unrecognized parameter (-.5) - ignored 
        unrecognized parameter (vtotc) - ignored 
        unrecognized parameter (-2.5m) - ignored 
        unrecognized parameter (vtotc) - ignored 
        unrecognized parameter (-2.5m) - ignored 
        unrecognized parameter (isr) - ignored

etc...

The model doesn't seem to work at all. All nodes show 0V ('xcept for the
power supply)

The only reference I foudn to the 'Level not specified on line' is about
a problem with ngspice. Is the -rework-15 version not correct and should
I download CVS?

Sorry for all the q's...

John

---------
This is the net (there are ^M's at the end of the lines in the included
model, which are not in the model file - I suppose these are generated
by some DOS-minded program?):

* gnetlist -g spice-sdb pre_fet.sch
*********************************************************
* Spice file generated by gnetlist                      *
* spice-sdb version 10.9.2004 by SDB --                 *
* provides advanced spice netlisting capability.        *
* Documentation at http://www.brorson.com/gEDA/SPICE/   *
*********************************************************
V2 1 0 DC 5V
R4 0 5 330
V1 4 0 dc 0 ac .01
R3 3 2 50
R2 0 3 330
.ac dec 100 1e6 1e8
R1 Vout 1 1k
C1 0 5 100n
QJ1 Vout 3 5 BF256C
*vvvvvvvv  Included SPICE model from /opt/gnome/share/gEDA/models/
BF256C.mod vv .model BF256C   NJF(Beta=1.4m Betatce=-.5 Rd=1 Rs=1
Lambda=4.6m Vto=-3.1^M
+               Vtotc=-2.5m Is=33.57f Isr=322.4f N=1 Nr=2 Xti=3
Alpha=311.7u^M
+               Vk=243.6 Cgd=2.132p M=.3622 Pb=1 Fc=.5 Cgs=2.104p
Kf=23.06E-18^M
+               Af=1)^M