Using Spice models in SwitcherCad: help

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Oriarso - 16 Sep 2005 08:34 GMT

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.

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JosephKK - 26 Oct 2005 02:41 GMT

> Hallo,
> I'm a student and I've a problem using Spice models into SwitcherCad.
[quoted text clipped - 6 lines]
>
> 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.

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JosephKK

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Jim Thompson - 26 Oct 2005 02:58 GMT

>> Hallo,
>> I'm a student and I've a problem using Spice models into SwitcherCad.
[quoted text clipped - 10 lines]
>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

I love to cook with wine. Sometimes I even put it in the food.

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JosephKK - 26 Oct 2005 05:54 GMT

>>> Hallo,
>>> I'm a student and I've a problem using Spice models into SwitcherCad.
[quoted text clipped - 17 lines]
>
> ...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}).

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JosephKK

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Helmut Sennewald - 26 Oct 2005 21:41 GMT

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

>>>> Hallo,
>>>> I'm a student and I've a problem using Spice models into SwitcherCad.
[quoted text clipped - 30 lines]
> may be expected to have problems though {big endian vs little endian,
> string formats, binary float formats and widths, etc}).

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Choong Keat Yian - 29 Oct 2005 13:50 GMT

Disregard this test.

Choong

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Electronics Forum / CAD / October 2005

Using Spice models in SwitcherCad: help