Crash Course: Resonant Modes using SIwave
Introduction
This guide will walk you through the process of analyzing resonant modes in your PCB using SIwave. We will cover file uploads, simulation setups, and result interpretation.
Step-by-Step Instructions
1. Upload Your File
- Click on the upload button.
- You will see all the supported file types, including IPC 2581 and ODB++.
2. Set Up the Simulation
- Go to the simulation tab and click on "Compute Resonant Modes".
- Provide a name for your simulation.
- Select the minimum frequency and the number of frequencies you want to analyze.
- Launch the simulation.
SIwave will calculate the resonance of all structures within your PCB.
3. Focus on Specific Structures
If you are only interested in specific structures or power planes, you can filter out the rest:
- Select the unwanted nets.
- Press the delete button to remove them from the analysis.
4. View Results
Once the simulation is complete, you can view the results:
- These results include the resonant frequencies, the value of K, Q, and the wavelength.
5. Analyze Resonant Frequencies
To see the waves:
- Select the planes and click "Compute".
- You can choose to hide structures or keep specific ones, such as the VCC.
- Scroll through the different frequencies to determine which power plane each resonance belongs to.
For example, frequency number one is located in a specific power plane, but not in the VCC. We are interested in resonances within the VCC, such as frequency number six, which is 1.168 MHz.
Conclusion
This process allows you to effectively identify and analyze resonant modes in your PCB using SIwave, ensuring optimal performance and design integrity.
Start by uploading your file. Click this button to see the standards and types of files SI Wave supports, including IPC 2581 and ODB++. Go to Simulation, click Compute, then Resonant Modes. Give it a name, select the minimum frequency and number of frequencies, and launch.
SI Wave will calculate the resonance of all structures in your PCB. If you're interested in specific structures, such as power planes, delete other nets. Select them, click Delete, and press the Delete button.
View the results, which include frequencies, resonant frequencies, K and Q values, and wavelengths. To see the waves, select Planes, click Compute, hide structures, or keep one of the VCC, and scroll through the different frequencies.
This way, you can tell which power plane the resonance belongs to. For example, number six, 1.168 MHz, is located in the VCC power plane. Look for resonances inside the VCC.
