LT SPICE IV

LTspice IV is a high performance SPICE simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators. Our enhancements to SPICE have made simulating switching regulators extremely fast compared to normal SPICE simulators, allowing the user to view waveforms for most switching regulators in just a few minutes. Included in this download are LTspice IV, Macro Models for 80% of Linear Technology's switching regulators, over 200 op amp models, as well as resistors, transistors and MOSFET models.

Also, you can import model for any other component, create symbol for it and use it in your schematics. In LT Spice there are symbols for vacuum tubes, but you should provide by yourself a spice models for them.

As a free software, LT Spice is very useful for design of schematics, graphic view of the transient mode in circuits, watching all the values of the critical parameters, etc. Is good to predict the work of your new circuit or see in details how works already implemented circuit.

Picture 1: LT Spice IV simulation circuit


You can download the LT Spice IV for free here.



Source: Linear Technology.