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Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
Get a Spice file from the manufacturer (usually "design resources" or somesuch), then RTFM for LTSpice about how to install the model, it should be fairly straightforward. Usually, if the file uses a standard pinning format (most do) and the simulator recognises it (most do), then the install just runs itself and you can use it straight away. If for some reason the pinning format doesn't get recognised, then there will usually be some dialgoue you can use to assign the model a symbol, and map symbol to model pins, a PITA but rarely needed.
For Simetrix, the model install consists of dragging the model file out of an explorer window and dropping it onto the simulator command window. Job done.
Registered Member #1621
Joined: Tue Aug 05 2008, 05:26AM
Location:
Posts: 19
Personally I love Simmetrix. Key point with any simulator is good models. I have used simulation to successfully design a very sensitive laser pulse detecting amplifier (discretes) that ran on just 150uA. Real device worked just like the sim. Also recently been doing some chip level CMOS design, for which there is no alternative to simulation.
Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
Is Simmetrix free? I tried to search for it, but I got a lot of other unrelated sites.
I went to irf.com and found their spice models, but many of the chips I desired are lacking packages. I could not find one for the irs21844 half-bridge chip. How do people here work around not finding spice models for chips they require?
Registered Member #1621
Joined: Tue Aug 05 2008, 05:26AM
Location:
Posts: 19
There is a demo version of simetrix - limited nodes (not too limited, but using opamps will chew them up pretty fast). Unfortunately the full version has become rather pricey. Simetrix only has one 'm' - that may be why you had trouble - sorry. link to demo version (you have to register)
Registered Member #53
Joined: Thu Feb 09 2006, 04:31AM
Location: Ontario, Canada
Posts: 638
This is simple but free. It will simulate ideal components so it might be good for initial design, the only down side is that it does not simulate in real time.
Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
I copied the IR21084.sub file from International Rectifier into my ../LIB/SUB directory for LTSPICE. What do I do now? I can't find a way to access this file.
Registered Member #2390
Joined: Sat Sept 26 2009, 02:04PM
Location: Milwaukee Wisconsin
Posts: 381
I have a multi-license copy of multisim if you are interested. I took a look at Simetrix, looks like a student version of multisim. Plus you get all the generators, scopes, and such. Its like a lab on your desk. You can also create your own footprints and set them up to copy any component, or just make up your own.
Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
I copied the IR21084.sub file from International Rectifier into my ../LIB/SUB directory for LTSPICE. What do I do now? I can't find a way to access this file.
Which bit of RTFM didn't you understand?
(hint p191, <gloat> much more complicated than Simetrix </gloat> )
Registered Member #1334
Joined: Tue Feb 19 2008, 04:37PM
Location: Nr. London, UK
Posts: 615
Dr. Slack wrote ...
I copied the IR21084.sub file from International Rectifier into my ../LIB/SUB directory for LTSPICE. What do I do now? I can't find a way to access this file.
Which bit of RTFM didn't you understand?
(hint p191, <gloat> much more complicated than Simetrix </gloat> )
Apples vs. Pears - LTspice is free and is developed & used by Linear Tech internally with many many 10s of 1000s of external users - Kudos to LT for making it publicly available for FREE. Simetrix is a cost option.
This is not the place for LTspice support - there is a hugely active Yahoo! group called, unsurprisingly, LTspice , where the developers hang out as do a whole bunch of serious users. You can easily get help there - the files section there also holds loads of useful libraries, including models for many digital ICs (74HCxxx etc.) [some of which I've written].
"My SPICE is better than Your SPICE" is a futile discussion - LTspice can handle most if not all PSPICE models, is free, pretty good (I've found it very accurate vs. real world), very fast and very actively maintained & updated. If it doesn't suit your needs, you can always pay money for something else.
Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
Kudos to LT for making it publicly available for FREE. Simetrix is a cost option.
No, it's free, well up to 150 nodes anyway.
Groking the GUI is probably the most important part of choosing a simulator. Some people at my work use LTSpice, it's always seemed a little more clunky to me than Simetrix, so I stick with (and stick up for) my favourite toy. These two camps drive the engineering manager potty from time to time, he's always asking us to settle on one simulator, and nobody will switch to the other. Of course if we need more than a toy can deliver, then we crank up ADS, Momentum, or HFSS (mega bucks and mega brain-ache).
"My SPICE is easier to use than your SPICE" is a useful discussion, download both and see which you get productive with first.
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