Tutorials relevant to Design and Modelling
From LTwiki-Wiki for LTspice
EMI Modelling using LTspice Hints
Pure Inductor and Voltage Source Modelling (and how to speed up simulations with them) using LTspice
Erno Borbely JFET Article No. 1 Operation and Practical Considerations
Erno Borbely JFET Article No. 2 Operation and Practical Considerations
File:PWM Filters.pdf Jim Wagner's white paper on PWM filtering
The Pulse-Width Modulator with an emphasis on the post-modulator lowpass filter
Loop Gain by Voltage Injection
Fundamental Characteristics of Thyristors
Pass Transistor Logic
LTspice has a built in Triangle Wave