Videos > Crash course: Power integrity of power planes using SIwave.
Nov 2, 2023

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Crash Course: Power Integrity of Power Planes using SIwave

This is a crash course in power integrity. Follow these steps to perform power integrity analysis using SIwave:

Step 1: Import Your File

Start by importing your file using any of the following supported formats:

  • SIwave
  • IPC 2581
  • ODB++

Step 2: Launch the PI Analysis

  1. Select your power plane.
  2. SIwave only solves what we call passive links.

A passive link can have only one net or a group of nets connected using passive components such as:

  • Capacitors
  • Inductors
  • Resistors

Usually, between nets of one power plane, you only have inductors or resistors. For example, consider a link between a VRM and a load.

Step 3: Setup and Configuration

  1. Place a port at the load and configure the equivalent circuit of your VRM.
  2. Assign a port on the CPU side.
  3. Configure and validate the setup, but do not simulate yet.

Step 4: Generate Circuit Elements

  1. Go to Tools > Generate > Circuit Element on Components.
  2. Select the component, in this case, your VRM.
  3. Connect the 1.2-volt line to ground using an inductor.
  4. Enter a name and modify values as needed, then confirm.

Once done, go to Home > Circuit Element to find the component you added. It should be active.

Step 5: Simulation

  1. Return to PI setup. Ensure the setup hasn't changed.
  2. Proceed to simulate from 0 to 1 GHz and launch the simulation.

Step 6: Analyze Results

  1. Once you have a solution, plot the magnitude.
  2. Focus on the self-terms and go to the Z plot.
  3. This plot shows the impedance seen from the load.

For more detailed guidance, consider consulting resources from Ozen Engineering, Inc.

[This was auto-generated. There may be mispellings.]

Title: Crash Course: Power Integrity of Power Planes Using SIwave This is a crash course in power integrity. Start by importing your file using any of these forms that are supported by SI Wave: IPC 2581 or ODB++. Go immediately and launch the PI analysis. Select your power plane.

SI Wave only solves what we call passive links. A passive link can have only one net or group of nets connected using what we call passive components. Passive components include capacitors, inductors, and resistors. Usually, between nets of one power plane, you only have inductors or resistors.

For example, we have a link here between a VRM and a load. The way we do the setup is we put a port at the load and we put the equivalent circuit of our VRM. So we assign a port here on the CPU side. Configure. Validate. Do not simulate. You close this. Now we go to Tools. Generate.

Circuit element on components. You select the component. In this case, it's our VRM. We want the 1.2 volt connected to ground and we want an inductor. Create. It's going to ask me about the name. So that's the value. These are the values. You can modify them. You say yes.

So you can enter any value you want. I'm going to use these values. You can go to Home. You can go to Circuit Element, and you're going to find this. This is the component that we added. And it's active. We go back to PI. Same setup. Didn't change. Now we can proceed and simulate.

So we want to simulate from 0 to 1 gigahertz and launch. Once we have a solution, we go here and we plot magnitude. And the thing you care about is the self terms. And you go to Z plot. That's the impedance seen from the load.

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