Performing EMI Analysis
This topic describes how to perform EMI Analysis, and check the results.
- On the toolbar, click
EMI Analysis. EMI analysis is performed
for all signals on the board.
When the analysis is completed, the results are displayed in the Radiation view.
- Select the EMI Frequency tab in the Radiation view. This tab shows the relation between factors causing EMI, and the frequency bands.
- The vertical axis shows the frequency bands.
- The Total E-Net column shows results for the entire board.
- The other cells show the result for each EMI factor.
- Values shown are peak values.
- To display the results as a spectrum, click Total Radiation Spectrum on the assist menu for the 66 MHz Frequency cell. The eCADSTAR Analysis Results Viewer dialog is displayed. This shows the Total Radiation Spectrum Result.
A different color is assigned to each EMI factor in the spectrum graph. The results for each factor are displayed or hidden by clicking the item in the explanatory note.
- From the Probe Set list in the eCADSTAR Analysis Result Viewer dialog, deselect the check box for IO Nets Driven By. The impact of I/O coupling noise is excluded from the result. The difference between two graphs indicates that I/O coupling noise has a significant impact, and is therefore the main factor causing radiation in this case.
- Select File > Exit to close Analysis Results Viewer.
This task is demonstrated in the following video.
