If I use LTspice do I have to modify the SPICE models that I download from MOSIS?
The models I download from CMOSedu.com work great with LTspice but I want to try some other technologies.
Yes, but you will have to change the
- Change Level = 49 to Level = 8 for the BSIM3 models you download from MOSIS at: http://www.mosis.com/requests/test-data.
- For the BSIM4 models LTspice uses Level = 54 which is what MOSIS supplies so no change is needed.
​In any case I would download the models, draft a ring oscillator, and compare the simulated oscillation frequency to the measured value reported by MOSIS in these files to verify that the models are working correctly.
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Archive: The LTSPICE library file made up from MOSIS files and LTSPICE test analysis .asc file: 180nM-NMOS-PMOS-T92Y-MOSIS-LTSPICE-Files-V2.7z The archive file should work straight out of the box after extraction. Make a directory and extract to it. It has the library file, symbols and an LTSPICE test circuit. NOTE: When I vary the threshold voltage of the models with this version I do not see any changes in FET analysis. I suspect something is not quite right with this setup. No errors are flagged and everything runs. |
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Archive: This LTSPICE archive has model files that are used by using an nmos4 and pmos4 symbol. Thus there is no subcircuit statements used in the library file. NOTE: With this version when I vary the threshold voltages I see the expected resultant change in the analysis output. 180nm analysis and model files The archive file should work straight out of the box after extraction. Make a directory and extract to it. It has the library file, symbols and an LTSPICE test circuit. |
Notes from the process follow. If you want to recreate the process for other MOSIS files they will be helpful.
Research Links
- Using TSMC Transistor Models from MOSIS in LT Spice – shows the few steps involved in setting up the MOSIS files for use with LTSPICE. It is minimal procedure
- Adding New Models to LTSPICE – This page will show you how to make your own part so you do not have to share the MOSFET symbol. Helps when you do not want to have to remember as much. Faster starts when you come back after not working with for a while
- MOSIS Test Data Page
- Tips for Converting Level 49 HSPICE models to Level 7 PSpice models
- BSIM3 Parameter Table
- Model Parameter Binning
Model Files – No modifications. As is from MOSIS
- MOSIS T92Y 180nm SPICE file – the file I want to use
- MOSIS N99Y 0.25 uM SPICE file – the file used in the example of how to adapt MOSIS files. See first link above.
- tsmc180nmcmos.lib – uses tsmc-018/t92y_mm_non_epi_thk_mtl_params.txt
Notes
- To bring up the components attributes editor for a part hold control button down and right click on the part. Set the Prefix = X to set the components attributes editor to come up each time you right click on the part.
Auxiliary Links
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