Help with PSpice error

[Joe]

Hi guys,

I'm running a PSpice simulation of a simple one-stage common cathode
amp circuit. I have two triode models which I've downloaded from the
Internet, and model works as expected. When I use the second model,
however, Orcad displays a message box with this error:

There are no data values in section number one - Ignoring this
section.

Then the simulation terminates, and the output file includes this
error message:

INTERNAL ERROR -- Overflow, Convert


As a beginning electronics student, I'm having trouble understanding
what these messages indicate and haven't found any information on the
Internet relating to them.

Does anyone know what these errors mean? The biggest difference
between the models seems to be the use of the poly statement in the
second one.


Any suggestions are much appreciated.

Thanks,
Joe

 

[Joe]

Thanks a lot for the reply. I was able to find out that the models
were originally written for Intusoft PSpice 5.0. I'm using them with
Orcad PSpice 10, and it was suggested that perhaps the command syntax
is different.

The only real difference between this model and the one that works is
the use of the POLY statement - which I'm finding to be rather
confusing. Here are a couple of those statements:


eG0 10 0 poly(1) <2,3> -3.7694e+00 1.9947e+00 5.9432e-02
eG1 11 0 poly(1) <2,3> -3.2024e-02 -4.1443e-02 -4.8236e-03
eG2 12 0 poly(1) <2,3> 1.9127e-02 -1.2189e-02 -1.5526e-03
eG3 13 0 poly(1) <2,3> -1.1354e-02 4.9339e-03 6.1016e-04



eP0 110 0 poly(1) <2,3> -9.9158e+0 1.9145e+0 -2.8135e+0 1.8661e+0
+ 1.5643e+0 4.7240e-1 6.4276e-2 3.3101e-3

eP1 111 0 poly(1) <2,3> 9.5428e-1 3.2558e-2 -8.3349e-1 -4.8578e-2
+ 2.6213e-1 1.0492e-1 1.8921e-2 1.3632e-3

eP2 112 0 poly(1) <2,3> 9.5766e-2 2.5192e-2 2.2391e-1 -1.7040e-1
+ -2.4952e-1 -1.0960e-1 -2.0981e-2 -1.4882e-3

eP3 113 0 poly(1) <2,3> -6.6107e-2 -3.9657e-2 7.5560e-2 3.1025e-2
+ 2.4265e-2 1.7002e-2 4.2512e-3 3.4761e-4

eP4 114 0 poly(1) <2,3> 8.4148e-3 4.7989e-3 -1.3258e-2 -1.9288e-3
+ 5.2888e-4 -5.6853e-4 -2.4727e-4 -2.4359e-5



I can't tell if there are any glaring syntax problems or not, but from
the reading I've don, I think these lines are okay for use with Orcad.


On 5 Nov 2004 11:57:42 -0800, geert@user1.be (Pinchy) wrote:

Joe <joe@emailserver.net> wrote in message news:<knh8o0h2e1n14hfnmo8esaqdb0etrlscca@4ax.com>...
Hi guys,

I'm running a PSpice simulation of a simple one-stage common cathode
amp circuit. I have two triode models which I've downloaded from the
Internet, and model works as expected. When I use the second model,
however, Orcad displays a message box with this error:

There are no data values in section number one - Ignoring this
section.

Then the simulation terminates, and the output file includes this
error message:

INTERNAL ERROR -- Overflow, Convert


As a beginning electronics student, I'm having trouble understanding
what these messages indicate and haven't found any information on the
Internet relating to them.

Does anyone know what these errors mean? The biggest difference
between the models seems to be the use of the poly statement in the
second one.


Any suggestions are much appreciated.

Thanks,
Joe

I think the models you have downloaded from internet are not complete
and missing numerical values. I think the error is caused by a
division through zero. Another option is that the iterative algoritm
used by spice is not converting to a solution. This is mostly the
case when there is no DC-path to ground. Try adding a resistor of
high value to ground (ground should have a zero as node number)

Geert

 

[Joe]

I took a closer look at the PSpice manual section below, and realized
it related to the VALUE statement also - which does exist once in this
model as follows:

eGIogVpc 20 0 value={log(v(1,3))}

I tried rephrasing this as

eGIogVpc 20 0 value={1}

and the simulation error disappeared! The results are entirely
inaccurate, but I think this confirms that the problem is with VALUE
and not POLY.

Now it's just a matter of figuring out why...





On Mon, 08 Nov 2004 04:02:19 GMT, Joe <joe@emailserver.net> wrote:

Thanks a lot for the reply. I was able to find out that the models
were originally written for Intusoft PSpice 5.0. I'm using them with
Orcad PSpice 10, and it was suggested that perhaps the command syntax
is different.

The only real difference between this model and the one that works is
the use of the POLY statement - which I'm finding to be rather
confusing. Here are a couple of those statements:


eG0 10 0 poly(1) <2,3> -3.7694e+00 1.9947e+00 5.9432e-02
eG1 11 0 poly(1) <2,3> -3.2024e-02 -4.1443e-02 -4.8236e-03
eG2 12 0 poly(1) <2,3> 1.9127e-02 -1.2189e-02 -1.5526e-03
eG3 13 0 poly(1) <2,3> -1.1354e-02 4.9339e-03 6.1016e-04



eP0 110 0 poly(1) <2,3> -9.9158e+0 1.9145e+0 -2.8135e+0 1.8661e+0
+ 1.5643e+0 4.7240e-1 6.4276e-2 3.3101e-3

eP1 111 0 poly(1) <2,3> 9.5428e-1 3.2558e-2 -8.3349e-1 -4.8578e-2
+ 2.6213e-1 1.0492e-1 1.8921e-2 1.3632e-3

eP2 112 0 poly(1) <2,3> 9.5766e-2 2.5192e-2 2.2391e-1 -1.7040e-1
+ -2.4952e-1 -1.0960e-1 -2.0981e-2 -1.4882e-3

eP3 113 0 poly(1) <2,3> -6.6107e-2 -3.9657e-2 7.5560e-2 3.1025e-2
+ 2.4265e-2 1.7002e-2 4.2512e-3 3.4761e-4

eP4 114 0 poly(1) <2,3> 8.4148e-3 4.7989e-3 -1.3258e-2 -1.9288e-3
+ 5.2888e-4 -5.6853e-4 -2.4727e-4 -2.4359e-5



I can't tell if there are any glaring syntax problems or not, but from
the reading I've don, I think these lines are okay for use with Orcad.


On 5 Nov 2004 11:57:42 -0800, geert@user1.be (Pinchy) wrote:

Joe <joe@emailserver.net> wrote in message news:<knh8o0h2e1n14hfnmo8esaqdb0etrlscca@4ax.com>...
Hi guys,

I'm running a PSpice simulation of a simple one-stage common cathode
amp circuit. I have two triode models which I've downloaded from the
Internet, and model works as expected. When I use the second model,
however, Orcad displays a message box with this error:

There are no data values in section number one - Ignoring this
section.

Then the simulation terminates, and the output file includes this
error message:

INTERNAL ERROR -- Overflow, Convert


As a beginning electronics student, I'm having trouble understanding
what these messages indicate and haven't found any information on the
Internet relating to them.

Does anyone know what these errors mean? The biggest difference
between the models seems to be the use of the poly statement in the
second one.


Any suggestions are much appreciated.

Thanks,
Joe

I think the models you have downloaded from internet are not complete
and missing numerical values. I think the error is caused by a
division through zero. Another option is that the iterative algoritm
used by spice is not converting to a solution. This is mostly the
case when there is no DC-path to ground. Try adding a resistor of
high value to ground (ground should have a zero as node number)

Geert