Software download: http://www.linear.com/designtools/software/#LTspice

• Short but effective guide to LTspice at ltwiki.org

• Switcher CAD 3 manual, the last official manual by Linear Technology of the LTSpice IV predecessor. Mostly used as reference.

• Great tutorial by Gunthard Kraus, e.g. lossy transmission lines, S-parameters, filters, …

• RF Special Edition: Complete Simulation of a 137MHz Weather Satellite Converter using LTspice IV by Gunthard Kraus

• Tspice IV Getting Started Guide, Linear Technology presentation

• Undocumented LTspice

• Simulating Ideal Opamp (pdf)

• LTwiki: Courseware and Tutorials

• LTSpice - Voltage Controlled Switch (youtube video)

• LTSpice Parameter Sweep Tutorial Andrew Herdrich, Department of Electrical and Computer Engineering, Portland State University, January 7, 2007, Version 2

Parameters and parameter sweep are defined by directives (commands starting with at dot).

Constant parameter:

.param C=1uF

Common loop expression, e.g. to test capacitors from 1μF to 10μF in 2μF steps:

.step param C 1uF 10uF 2uF

Parameters from a list:

.step param C list 0.47uF 1uF 2.2uF 10uF

Logarithmic (common log, base 10) parameter variation, e.g. 8 steps from 100nF to 1uF:

.step dec param C 100nF 1uF 8

logarithmic (base 10) AC sweep from 1 Hz to 100kHz with 10 steps per decade:

.ac dec 10 1 100k