LTspice IV: Importing & Exporting Data
Jul 18th 2013The LTspice IV waveform viewer is a handy way to perform basic measurements, but there are times when you need to export data from, or import data into LTspice to further evaluate a circuit. To export waveform data to an ACSII text file: Click to select the waveform viewer Choose Export from the File menu. Select the traces ...
LTspice IV: Noise Simulations
Jul 1st 2013LTspice IV can perform frequency domain noise analysis which takes into account shot, thermal and flicker (1/f) noise. The resulting noise density (in units of volts per square root hertz) can then be plotted to aid in circuit analysis and understanding. This video covers how to setup a .noise simulation in LTspice to view ...
LTspiceIV: Piecewise Linear (PWL) Functions for Voltage & Current Sources
Jun 10th 2013Piecewise linear (PWL) functions are used to construct a waveform from a series of straight line segments connecting points defined by the user in LTspice IV. Since PWL functions are useful in creating custom waveforms, they are typically used in defining voltage or current sources. To add a PWL function to a voltage or current ...
LTspice IV: Undocumented Shortcuts
May 1st 2013There are several undocumented shortcuts in LTspice IV that you might find useful: Alt + left-click on a label, V(n008), in the waveform viewer to highlight that particular net in the schematic editor. To route wires at an angle, hold down Ctrl key as you draw them. Text with a preceding underscore character, e.g., “_FAULT”, ...
LTspice IV: Keyboard Shortcuts
Apr 15th 2013Keyboard shortcuts are an alternate way to invoke one or more commands in LTspice IV that would otherwise only be accessible by clicking through the menu or toolbar. You can view these shortcuts for the schematic editor by choosing: Tools > Control Panel > Drafting Options and clicking Hot Keys. Hot Keys can be reprogrammed ...
Simulating Power Planes with LTspice IV
Apr 8th 2013When designing Power Distribution Networks (PDN) it is common to use SPICE models to represent the planes. High-end designs use 2D/3D electronic magnetic modeling tools to extract SPICE models. However, there are times when a simple spice model will suffice, or you may not always have access to very expensive 2D/3D modeling ...
LTspice IV: Evaluating Electrical Quantities
Apr 4th 2013Utilizing LTspice IV waveform viewer to analyze a circuit and perform basic measurements is very useful. However there are times where you need to evaluate a circuit with a numerical analysis. For these circumstances .MEASURE statements can be very powerful in evaluating user-defined electrical quantities. .MEASURE statements ...
LTspice IV: Stepping Parameters
Mar 18th 2013Plotting voltages or currents in a simulation is important but so is varying a parameter in a device or model so that you can compare performance and develop your circuit intuition. There are two ways to examine a circuit in LTspice IV by changing the value of a parameter. You can either manually enter each value then re-simulate ...
LTspice IV: Adding Third-Party Models
Mar 3rd 2013LTspice IV supplies many device models to include discrete like transistors and MOSFET models. Nevertheless, there are also many third-party models from manufacturers that are available that you could add to your LTspice IV circuit simulations. These third-party SPICE models are described with a .MODEL and .SUBCKT statements. ...
LTspice IV: Using Transformers
Feb 16th 2013Transformers and coupled inductors are key components in many switching regulator designs to include flyback, forward and SEPIC converters. They perform critical function in providing an isolation barrier, enabling high step-down or step-up ratios and accommodating multiple or inverting outputs. Although it is possible to make ...
LTspice IV: Waveform Viewer
Feb 2nd 2013LTspice IV includes an integrated waveform viewer that in combination with the schematic editor provides an easy way to display and review simulation data. This means that if you click on an object in the schematic editor, the voltage on that wire or current through that component will be plotted on a waveform viewer and some ...
LTspice IV: Schematic Editor
Jan 15th 2013Unlike many schematic capture programs, LTspice IV schematic editor was written explicitly for running SPICE simulations. This means that if you click on an object, the default behavior is to plot the voltage on that wire or current through that component, not select the object for editing. Hence, the first couple of times you ...
LTspice IV: Overview
Jan 1st 2013LTspice IV is a high performance Spice III 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 ...
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