Assigning Vendor Models to Components
This short tutorial explains how to assign vendor models to components in SI-Wave. When you upload any model from an ECAD tool, the components such as capacitors and inductors often have ideal numbers. For instance, capacitors may only have a capacitance value without ESL (Equivalent Series Inductance) or ESR (Equivalent Series Resistance). While this is sufficient for initial studies, a more accurate model is required for detailed analysis.
Model Replacement
The best approach is to use an S-parameters model. However, you can also use an equivalent circuit model with ESL and ESR values derived from the vendor. Here's how you can do it:
Steps to Assign Vendor Models
- Go to the Tools menu.
- Select SPICE S-parameter Vendor Model Assignment.
- Choose a component, for example, a capacitor.
- Select Assign SPICE S-parameter Model.
Filtering Options
SI-Wave will display all available models for the selected component. You can filter these models by:
- Supplier Name: For example, select "Murata".
- Size: Ensure you select the exact size, such as 1206, to match the pad size.
- Series: You can choose a specific series or leave it open to see more options.
Selecting the Model
Once you have filtered the list:
- Review the ESL and ESR values.
- Select the model that best fits your requirements.
- Click OK to populate the model in your circuit.
Once assigned, this model will be used throughout your circuit analysis, ensuring consistent and accurate results.
Thank you for watching!
Hi, this short tutorial is about assigning vendor models to components. As you know, when you upload any model from any ECAD, the models, components, capacitors, and inductors typically have ideal numbers. So, if it's capacitors, it has only a capacitor number, not ESL or ESR.
This is good enough for some initial studies, but at the end, you need to replace that with a better model. The best thing is to have an S-parameters model, but sometimes you can get away with a simple equivalent circuit, which has ESL and ESR derived from the vendor.
The way to do that is to go to Tools, and from Tools, select SPICE S-parameter vendor model assignment. From there, for example, if you select a capacitor, then select Assign SPICE S-parameter model, SI-Wave will show you all the different possibilities for that kind of capacitor model.
You can filter them by the name of the supplier. For example, in this case, I just selected Murata. The size, you can see it from the dropdown, here you have to select exactly the same size, which is 12 or 6 in our case, because you don't want to change the size of the pads.
For the series, you have several options; you can select one or keep it open. You can also select a series if you want, but most of the time, I don't. I usually keep it open and look at how many possibilities I have. If I have many, then I start filtering even more.
So, we'll keep it open and see how many possibilities we have. Now, I can look at them, check the ESL, ESR, and select, for example, this one and go ahead with it. And I say, "This is the one I want." The moment you press okay, it gets populated here.
So, now this capacitor, of course, this model will be used many times in your circuit, but everywhere it's used, these are the numbers that will be used in the analysis. And that's it. Thank you for watching.
