Re: Using Spice models in SwitcherCad: help

Jim Thompson wrote:

> On Wed, 26 Oct 2005 01:41:28 GMT, JosephKK
> <joseph_barrett@xxxxxxxxxxxxx> 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

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