LTspice Tutorials from CMOSedu.com
Below describes how to plot Gm/Id using LTSpice and does so with some generic Mosfet models. The Mosfet models are from the Predictive Model Technology website. They are all BSIM4 models and are from 4 different technology nodes: 130nm, 65nm, 32nm and 22nm models. By Gabino Alonso LTspice IV can automatically create a symbol for a third-party model, or you can associate a third-party subcircuit with an LTspice intrinsic symbol, as long as the third-party.SUBCKT model and the intrinsic symbol share an identical pin/port netlist order.
Dn2540 Spice Model
This video demonstrates the use of LTSpice to study the transfer and drain characteristics of enhancement type MOSFET used in switching applications. The NMOS and PMOS are for monolithic FETs whereas the VDMOS is a model unique to LTSpice that models discrete MOSFETs and has a parameter for specifying NMOS or PMOS. VDMOS is what I'll cover in this post. One thing I was surprised about is that ALL of the MOSFETs in LTSpice's standard.mos library are modeled using the VDMOS type.
LTspice at CMOSedu.com (examples, downloads, links, etc.).
EE 220DLTspice discussions, examples, and even more videos for first semester circuits.
Ltspice Jfet
Video tutorial on using LTspice on the Mac is found here.
Help doing a .op sim on the Mac is here.
LTspice_video_1 | (13:50) | – installing LTspice and running an operating point (.op) simulation,CMOSedu_sim1.asc(right click these *.asc files to “Save as”) |
LTspice_video_2 | (21:43) | – dependent sources in operating point, transient, and DC sweeps,CMOSedu_sim2.asc,CMOSedu_sim3.asc,CMOSedu_sim4.asc,CMOSedu_sim5.asc, and CMOSedu_sim6.asc |
LTspice_video_3 | (21:01) | – making an ideal op–ampsubcircuitand symbol, probingsubcircuits,CMOSedu_video_3.zip |
LTspice_video_4 | (23:48) | – example simulations from Ch. 1 of the CMOS book, pages are seen inCMOSedu_SPICE_Ch_1.pdf, simulations files are found inCMOSedu_video_4.zip |
LTspice_video_5 | (27:43) | – simulating an inverter and ring oscillator, simulations files are found inCMOSedu_video_5.zip |
Tips and Examples:
1. | Using the current–controlled current source (CCCS) and the voltage–controlled voltage source (VCVS) –tip_1 |
2. | Making visible/invisible component parameters such as a MOSFET’s width/length or capacitor effective series resistance –tip_2 |
3. | Modeling a transformer –tip_3 |
4. | If the output plots are jagged add the spice directive '.options plotwinsize=0' to the schematic |
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Ltspice Mosfet Model Parameters
Videos from CMOSedu.com
Ltspice Mosfet Driver
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