LTspice® is a powerful, fast, and free SPICE simulator software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits. Its graphical schematic capture interface allows you to probe schematics and produce simulation results, which can be explored further through the built-in waveform viewer.
Learn how to use LTspice with our tutorials below or dive deeper with our selection of helpful tips and articles. You can also browse our library of macromodels and demo circuits for select Analog Devices products.
The key to most circuit designs is the speed with which you can reach an understanding of your circuit, its correctness, and its limitations. LTspice outperforms many other simulation tools and enables you to iterate your designs in minimal time.
Circuit design is the first step for every electronics design project. This requires the creation of a schematic diagram which defines how electronic components are logically connected on a printed circuit board (PCB). When the circuit design is complete, engineers can perform SPICE simulations or translate their schematic into a PCB design software.
The creation of accurate electrical component symbols forms the foundation to a successful circuit design. Symbols provide all the parametric data needed to run accurate simulations, order manufacturable parts, and provide connectivity on electronic circuits.
Multi-sheet schematics help to manage and organize the complexity of advanced circuit designs. Multiple circuit designs can be hierarchically linked together with symbols to improve circuit readability and structure.
SPICE simulation allows you to simulate and analyze the behavior of a circuit design. Performing operating point, AC/DC sweep, or transient analysis simulations identify circuit performance issues without requiring a PCB prototype.
TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages and waveforms. TINA's schematic capture is truly intuitive - a real "quickstart."TINA-TI installation requires approximately 500MB. Installation is straight-forward and it can be uninstalled easily, if you wish. We bet that you won't.
When you build an arbitrary circuit, EveryCircuit shows you how it works, even if you have just invented a new design. This is made possible by a custom-built circuit simulation engine under the hood.
MacSpice simulates and analyses electronic circuits that can range in complexity from a singleresistor to an integrated circuit comprising tens-of-thousands of devices. It hasusers who range in experience from novices to retired integrated circuit designers.It is used at various universities internationally for research and teaching.
Circuit simulation is a way of building and testing virtual models of electronic devices. It isusually cheaper and quicker to simulate a design than to build a prototype.MacSpice requires a text-file description of the circuit as input. This 'netlist'is a list of components and the nodes they connect to. Users may prepare netlists with atext editor, or derive them from a circuit diagram using a third-partyschematic-capture application. MacSpice then builds a numerical model of the circuit and analyses this.
A macOS release is currently not available from the ngspice web pages. You may refer to Homebrew or MacPorts for an executable. For Linux we do not offer pre-compiled packages. You may either resort to your Linux distributor und use their installation manager for a pre-compiled package. Some are listed here. However these may not yet contain the current release version. So you might want to compile ngspice by yourself. Then download and extract the sources from the ngspice-39 tarball. Please see file INSTALL or the ngspice manual (chapt. 32) for instructions on compilation and installation of ngspice. Installation on RedHat or similar OSs is described here.
Using 'git' offers you a way to get access to all branches and to manage them. The following command will download the complete sources from the ngspice git repository via anonymous access. You will find the ngspice top level directory as [actual directory]/ngspice, containing a complete local git repository.
While doing a circuit simulation in KiCad for another article (Performing A Circuit Simulation In KiCad) and getting some strange results, I wanted to verify those results with a different SPICE simulator. While doing some research on what packages were available, LTspice kept popping up. I decided to download it and give it a try. By the way, the strange KiCad results I was getting turned out to be user error.
LTspice is a high performance SPICE simulator, schematic capture, and waveform viewer with enhancements and models for making simulation of analog circuits easier. It was originally created by Linear Technology, hence the LT in its name, and was later acquired by Analog Devices who continues to support it. LTspice is known for being the most widely used free SPICE simulator in the industry.
Open the LTspice application by double-clicking the LTspice.app application within your /Applications folder. You should see a notification that it was an app downloaded from the internet and asking if you are sure you want to open it.
Click the Open button to continue opening the application. NOTE: Sometimes you may need to right-click the application and open it from the contextual menu if the system states it was not able to open the application due to it being downloaded from the internet or from an unidentified developer. Once opened, you will be presented with a welcome window asking how you want to proceed.
Upon initial launch of the LTspice application, it will automatically create the ~/Documents/LTspice folder where your LTspice files will be stored. It will also add an examples folder within the LTspice folder that contains Educational and test jigs example circuits. These same example circuits are also located in the /Applications/LTspice.app/Contents/examples folder.
Our circuit is looking good, but to run a simulation, we need to add power supplies and let LTspice know what type of simulation we want to perform. Our updated schematic will eventually look like the one shown below.
To add a voltage source, select and place (Draft > Component) a voltage/Voltage Source component in an empty area of the schematic and then change its DC value (right-click on the voltage component) to 20 volts. You can ignore the Series Resistance[Ω] field. Add a GND net name to its negative terminal and a Vcc (Output Port Type) net name to its positive terminal. These net names will virtually connect those named terminals to the same named terminals of our amplifier. This voltage source will supply DC power to the amplifier circuit.
We could have just connected the positive terminals of the voltage sources to the appropriate connections on the amplifier circuit, but I wanted to illustrate the use of named nets for connecting across circuits and this is also a common practice for connecting power supplies.
We are done adding components and wiring up our schematic. It is now time to tell LTspice what kind of simulation we want to perform. To add a SPICE command, select Draft > Spice directive from the contextual menu, enter .op in the text box, click the OK button, and then click somewhere in the schematic to place the text. The .op directive requests that an Operating Point Analysis be performed. It is the simplest SPICE simulation that can be performed and will only look at the DC domain ignoring any AC attributes. It will provide us the various DC based node voltages and component currents in the circuit.
Glad to hear you got it working. I believe what you are looking for is described on the help page located at Main Menu > Help > LTspice Help > Frequently Asked Questions (FAQ) > Third-party Models. I tested it with the TL072 SUBCKT downloaded from the LTwiki and it seemed to work fine.
I have only limited experience in updating models and subcircuits in LTspice. Check out the help page located at Main Menu > Help > LTspice Help > Frequently Asked Questions (FAQ) > Third-party Models; hopefully it will point you in the right direction. Also, try putting your subcircuit file in the same directory as your schematic and point to it directly with your .include statement. I have also been able to put a subcircuit in the same directory hierarchy with .include lib/sub/TL072.sub.
MacSpice is an electronic circuit simulator. Circuit simulation is a way of building and testing virtual models of electronic devices. It is usually cheaper and quicker to simulate a design than to build a prototype.
McCAD Schematics Lite (Scholastic Edition) is a sophisticated engineering database management system that allows the electronic designer to easily create and revise electronic circuit designs (digital or analog).
Qucs is an integrated circuit simulator which means you are able to setup a circuit with a graphical user interface (GUI) and simulate the large-signal, small-signal and noise behaviour of the circuit.
This software is an electrical circuit analysis and resolution in AC and DC Circuit drawing, values and formulas for currents and voltages, equations verification, graphs drawing, equivalent circuits, filter analysis, frequency response graphs.
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