Spice model extraction software

Resistor, Capacitor. Attaching these types of models to a component is straigthforward and simply a process of select-and-enter select the model type and enter the parameter values directly in an associated dialog. Creation of this model file by hand and then linking it manually to the required schematic component can be quite laborious. Using the Wizard the characetristics of such a device can be defined based on user-acquired data. The parameters — entered either directly or extracted from supplied data — are automatically written to a model file and that file linked to the nominated schematic component.

For more information on linking a model file, refer to the Linking a Simulation Model to a Schematic Component application note. For detailed information on defining a digital simulation model, refer to the Creating and Linking a Digital SimCode Model application note. The behavioral characteristics of the model are defined based on information you supply to the Wizard. The extent of this information depends on the device type you wish to create a model for — ranging from the simple entry of model parameters, to the entry of device data obtained from a manufacturer's data sheet or by measurements gained from the physical device itself.

The following sections discuss the use of the Wizard — from access to verification. A model can be added:. If you are unsure of the device you wish to model, access the Wizard by choosing Tools » XSpice Model Wizard from the main menus.

By accessing the Wizard in this way, you will be able to choose:. This is made especially evident when accessing the Wizard from the Sim Model dialog. Figure 2. Access the Wizard directly from the Sim Model dialog. The Sim Model dialog itself can be accessed from a schematic library document in one of the following ways:.

If you are editing an existing linked simulation model, using the Wizard will replace the existing model with the newly created one. The Wizard can also be accessed when defining the simulation model link for a placed component on a schematic sheet. Again, access is made from the Sim Model dialog by clicking the Create button — provided of course that the model type is one of those for which a dedicated Wizard is available. Figure 3. Accessing the Wizard for a placed schematic component.

When using the Wizard to add a model to a new library component, the name specified for the model will be used to name the component also. One of the most important steps as you follow the pages of the Wizard, is to provide a name for the model you are creating. In fact, you will not be able to proceed to the parameter definition stage of the Wizard until you have entered a name. After creation, this name will appear in the Model Name field of the Sim Model dialog.

The model file itself is also created using this name ModelName. Figure 4. Define a meaningful name for the model. When naming the model, you also have the option to enter a short description for it. This could be the function of the model e. Semiconductor Resistor , or a more specific reference to a value or configuration e.

After giving the model a name, you will proceed to one or more pages dealing with the characteristics to be modeled. The model types supported by the Wizard can be categorized into the following two groups:. A parameter specified in the model file for a device will override its default value inherent to the SPICE engine. This is the content that will be saved to the MDL file. Figure 5. Previewing the generated model file content.

Editing of the model can be carried out directly on this page, giving you the utmost control over model specification. Once you are satisfied with the model definition, simply click Next to pass to the end of the Wizard. Clicking Finish will allow you to save the model. By default, the file will be saved to the same directory as the schematic library document. You can also change the name of the file at this stage, should you wish.

If you have requested the model be attached to a new component, that component will be created and added to the library document.

Although the model is linked automatically to the component — new or existing — you should make a habit of verifying the mapping of schematic component pins to pins of the model. Simply access the Sim Model dialog for the attached model, click on the Port Map tab, and check the pin mapping — making any changes if required. Figure 6. Verify the component-to-model mapping. Define any additional parameters available for the model — on the Parameters tab of the Sim Model dialog — as required.

For the following device models the Wizard does not extract parameter information from entered data. Rather, the models are created based on direct entry of values for their associated parameters. When entering parameter values, there are a couple of things to bear in mind:. Already own one of these products?

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View All Resources. These demanding applications require a solid understanding of the end application and design-centered approach to model extraction and accuracy. Logix's strength lies in the company's ability to provide custom solutions tailored to their partners needs.

Different process technologies require a variety of models that can be quickly adapted to the unique processes. With modeling measurements taking hours or even days, measurement control software must also work with probers and instruments to allow automated measurements across temperature. Utmost IV includes the following components:. This module is used to measure physical devices directly, using various types of electrical test equipment. This module is used to extract and optimize SPICE model parameters to obtain an accurate fit between simulated and measured device characteristics.

The datasets stored in the database are used as targets for the model extraction. Compact, macro subcircuit , and Verilog-A models can be generated for all device types.

This module provides a scripting interface that allows the user to write custom JavaScript-based scripts to measure, extract, optimize, and store the results.