Using Spice models in SwitcherCad: help

O

Oriarso

Guest
Hallo,
I'm a student and I've a problem using Spice models into SwitcherCad.
I downloaded the models from Internet, but I'm not sure I used those
correctly since the simulation results are unreliable.

Can someone explain to me how to insert/put spice models into
SwitcherCad? Or the rason for which a Spice model downloaded fron
Internet cause many errors and/or give unrealiable resultrs.

Thanks! Oriarso.
 
Oriarso wrote:

Hallo,
I'm a student and I've a problem using Spice models into SwitcherCad.
I downloaded the models from Internet, but I'm not sure I used those
correctly since the simulation results are unreliable.

Can someone explain to me how to insert/put spice models into
SwitcherCad? Or the rason for which a Spice model downloaded fron
Internet cause many errors and/or give unrealiable resultrs.

Thanks! Oriarso.
Click to expand...
Probably because they use very different models and a spice model for a
transistor may look like a bizarre collection of sources, admittances, and
susceptances.
--
JosephKK
 
On Wed, 26 Oct 2005 01:41:28 GMT, JosephKK
<joseph_barrett@sbcglobal.net> wrote:

Oriarso wrote:

Hallo,
I'm a student and I've a problem using Spice models into SwitcherCad.
I downloaded the models from Internet, but I'm not sure I used those
correctly since the simulation results are unreliable.

Can someone explain to me how to insert/put spice models into
SwitcherCad? Or the rason for which a Spice model downloaded fron
Internet cause many errors and/or give unrealiable resultrs.

Thanks! Oriarso.

Probably because they use very different models and a spice model for a
transistor may look like a bizarre collection of sources, admittances, and
susceptances.
Click to expand...
Spice models are pretty standard for all flavors of Spice.

What does "simulation results are unreliable" mean? That usually
implies ESTO (equipment smarter than operator :)

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
Jim Thompson wrote:

On Wed, 26 Oct 2005 01:41:28 GMT, JosephKK
joseph_barrett@sbcglobal.net> wrote:

Oriarso wrote:

Hallo,
I'm a student and I've a problem using Spice models into SwitcherCad.
I downloaded the models from Internet, but I'm not sure I used those
correctly since the simulation results are unreliable.

Can someone explain to me how to insert/put spice models into
SwitcherCad? Or the rason for which a Spice model downloaded fron
Internet cause many errors and/or give unrealiable resultrs.

Thanks! Oriarso.

Probably because they use very different models and a spice model for a
transistor may look like a bizarre collection of sources, admittances, and
susceptances.

Spice models are pretty standard for all flavors of Spice.

What does "simulation results are unreliable" mean? That usually
implies ESTO (equipment smarter than operator :)

...Jim Thompson
Your reply indicates that this is a version of Spice. Further reading of
Click to expand...
this ng verifies it. (hey i just started here tonight.) Since all the
versions of Spice i know of are derived from Berkeley (BSD) Spice. This
explicitly includes Pspice, Hspice, Isspice, ngspice and many others.
Similarly all of the secondary vendors have proprietary extensions which
they merge with their favorite improvements from BSD. So i was in error as
SwitcherCad (LTspice) is derived from BSD spice, and should have compatible
device model formats (especially the subcircuit variety, binary versions
may be expected to have problems though {big endian vs little endian,
string formats, binary float formats and widths, etc}).
--
JosephKK
 
Hello Joseph,

I have seen this evening that you jumped into many SPICE questions.

Oriarso has asked as adviced in the Yahoo group and has got
a comprehensive answer.

LTspice has become the most widely used SPICE in many areas
because it's very fast, very stable, very compatible to
PSPICE syntax and everybody can afford it.
LTspice and SwitcherCAD is the same program.

It's free.
It's not a only a demo version.
It's a full blown SPICE simulator.

You can run it with thousands components when you need that.

http://www.linear.com/designtools/softwareRegistration.jsp



There is a powerful LTspice user group with nearly 4000 members.
The author of LTspice also answers question in this group.

http://groups.yahoo.com/group/LTspice

There are also hundred of ciruit examples for simulation
available from the Files section of this group.

Best regards,
Helmut

Moderator of the mentioned group



"JosephKK" <joseph_barrett@sbcglobal.net> schrieb im Newsbeitrag
news:OZD7f.9239$Zv5.2671@newssvr25.news.prodigy.net...
Jim Thompson wrote:

On Wed, 26 Oct 2005 01:41:28 GMT, JosephKK
joseph_barrett@sbcglobal.net> wrote:

Oriarso wrote:

Hallo,
I'm a student and I've a problem using Spice models into SwitcherCad.
I downloaded the models from Internet, but I'm not sure I used those
correctly since the simulation results are unreliable.

Can someone explain to me how to insert/put spice models into
SwitcherCad? Or the rason for which a Spice model downloaded fron
Internet cause many errors and/or give unrealiable resultrs.

Thanks! Oriarso.

Probably because they use very different models and a spice model for a
transistor may look like a bizarre collection of sources, admittances,
and
susceptances.

Spice models are pretty standard for all flavors of Spice.

What does "simulation results are unreliable" mean? That usually
implies ESTO (equipment smarter than operator :)

...Jim Thompson
Your reply indicates that this is a version of Spice. Further reading of
this ng verifies it. (hey i just started here tonight.) Since all the
versions of Spice i know of are derived from Berkeley (BSD) Spice. This
explicitly includes Pspice, Hspice, Isspice, ngspice and many others.
Similarly all of the secondary vendors have proprietary extensions which
they merge with their favorite improvements from BSD. So i was in error
as
SwitcherCad (LTspice) is derived from BSD spice, and should have
compatible
device model formats (especially the subcircuit variety, binary versions
may be expected to have problems though {big endian vs little endian,
string formats, binary float formats and widths, etc}).
--
JosephKK
Click to expand...
 
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