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New LTspice②: How to Use SPICE Models | Analog Devices
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アナログ・デバイセズ
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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

LTspiceのデモ回路をツールバーの「Component」→Searchからデバイスを検索しデバイスを選択→「Open Example Circuit」で入手する画面イメージ

They can also be obtained from the Analog Devices website.

LTspiceのデモ回路をアナログ・デバイセズのWebサイトから入手する画面イメージ

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 obtained SPICE model in a text editor and copy the text starting from ".Model ~".
入手したSPICEモデルをテクストエディタで開き、「.Model ~」以降をコピーする際に、コピーする文言のイメージ
  • 3. Open "SPICE Directive(.)" -> Edit Text on the Schematic from the LTspice toolbar and paste the text after .Model.
LTspiceツールバーの「SPICE Directive(.)」→Edit Text on the Schematicを開き、.Model以降をペーストする場所
  • 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.

LTspiceツールバーの「SPICE Directive(.)」→Edit Text on the Schematicを開き、.Model以降をペーストする場所

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"
サブサーキットモデル、青文字になっている「.SUBCKT …」の画像
  • 4 . Save the automatically generated symbol to your desired directory.
自動生成されるシンボルを任意のディレクトリに保存する際の画面イメージ
  • 5 . Select the automatically generated model from the Component option in the toolbar.

The subcircuit model can now be used.

ツールバーの「Component」から自動生成したモデルを選択する画面

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