- Analog Devices, Inc.
- NEXT Mobility
What is LTspice?
LTspice is a SPICE simulator provided free of charge by Analog Devices.
The library includes macro models for many Analog Devices products and passive components.
Demo circuits are also available.
How to Obtain LTspice Demo Circuits
From the toolbar, select Component -> Search for the device -> Select the device -> Open Example Circuit
They can also be obtained from the Analog Devices website.
SPICE Model
LTspice can also use SPICE models not registered in the library.
Device Models
Element models, including transistors, FETs, and diodes, are described with .MODEL
There are several ways to use them, but here is a simple method.
- 1. Obtain the SPICE model from the manufacturer's website, etc.
- 2. Open the SPICE model you obtained in a text editor and copy everything after ".Model ~".
- 3. Open "SPICE Directive(.)" -> Edit Text on the Schematic from the LTspice toolbar and paste the text after .Model.
- 4. Ctrl+right-click the element of the SPICE model to be used to open the Component Attribute Editor.
Enter the model name to be used in the Value field.Now the device model can be used.
Subcircuit Models
Circuit models with a hierarchical structure described with .SUBCKT
Using subcircuit models requires symbol creation, but LTspice has a function to automatically generate symbols from models.
- 1. Obtain the SPICE model from the manufacturer's website, etc.
- 2.Drag and drop the obtained SPICE model into LTspice to open it.
- 3. Right-click on the blue text ".SUBCKT..." and select "Create Symbol."
- 4.Save the automatically generated symbol to your desired directory.
- 5. Select the automatically generated model from the Component option in the toolbar.
The subcircuit model can now be used.
Inquiry
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