I have wanted to use the SPICE MOSFET model more closely for while and found this guide: MOSFET Simulation Guide
With it I hope to be able to finally crack the problem of changing the threshold voltage. Up till now when I have gone into the text of the model files for MOSFETs and altered Vth0 I have not seen any material change in the threshold voltage. Obviously I am doing something wrong or do not understand how the SPICE simulator is going about its business.
Research Links
- PDF: MOSFET Simulation Guide – Self Defined MOSFET
- SPICE MOSFET model parameters
- A 180 Nanometer MOSFET Model – Using TSMC Transistor Models from MOSIS in LT Spice
- LTspice Tutorial explains how to import third party models into LTspice
- Creating LTSPICE MOSFET Models
Partial solution to change threshold voltage:
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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
- The unaltered diode connected voltages with 10uAmps agrees with both methodologies.
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