LTSpice

LTSpice is a schematic editor and circuit simulator. Once a schematic is created and the type of simulation is chosen, the circuit can be simulated. Next, by clicking on nodes or elements in the schematic, signals (voltage or current) can be displayed and analyzed.

Install Files for LTSpice XVII

Windows version of LTspice: (for Windows 7,8 and 10) LTspiceXVII.exe

Mac os x version of LTspice: (for OS X 10.7+) LTspice.dmg ----- For OS X, there is a needed LTSpice Shortcuts Page

Quick tips on LTspice:

- Right click (not double click) on an item to edit its property.

- You can choose the type of simulation (transcient, ac analysis, dc sweep, etc) under "simulate" - "edit simulation cmd"
(For OSX users, use shortcut "s" to add a spice directive then right click in text box and choose "Help me edit")

- After a simulation, click on a net or device terminal of interest to plot the voltage or current, respectively.

- A single voltage source can be used as different kinds voltage sources by changing its property.

- Label important nets such as input and output

- You can view the spice netlist under "view" - "spice netlist".
(For OSX users, right click on schematic and look under "view")

Useful shortcuts:

F2: add a component

F3: draw a line

F4: label a wire net

F5: delete

F6: duplicate

F7: move (Ctrl+R: rotate, Ctrl+E: mirror)

F8: drag

F9: undo

ESC: cancel


More Details on LTSpice

There is a LTspice tutorial website located at http://denethor.wlu.ca/ltspice/ and http://ltwiki.org/index.php5?title=SPICE_and_LTspice_Courseware_and_Tutorials

and also some LTspice tutorials available here: scad3.pdf and LTSpiceShortGuide.pdf

(it used to be called switcherCAD)

Schematic Hierachy in LTSpice

To use hierarchy in LTspice as well as passing parameters through hierachy, look here: Hiearchy in LTspice and passing parameters in hierarchy

Generic Spice Manual

A generic spice manual can be found at http://www.eecg.utoronto.ca/~johns/spice/SPICE_Circuit_Simulator_Reference_Manual.html

Plotting Gm/Id using LTSpice

It is sometimes useful to plot Gm/Id for transistors to help with choosing how to bias a transistor. It is not straightforward in LTSpice since Gm is not an output parameter in LTSpice. The link below describes how to plot Gm/Id using LTSpice and does so with some generic Mosfet models

Plotting Gm/Id with LTSpice