To analyze impedance on your board in OrCAD X Presto PCB Editor, do the following:
1. Go to View > Panels > Analysis Workflows.
2. From the drop down within the Analysis Workflows panel make sure Impedance Workflow is selected.
3. Under Analysis Set Up, keep Analysis Modes as Net Based, then choose Select Nets.
4. Select all the nets for analysis then click apply and OK.
5. Next, select Set Up Analysis Options. This opens the IDA Compliance Analysis Parameters Setup.
6. Turn everything on that you would want to analyze, then click Apply and OK.
7. Next, click Start Analysis. The software will analyze the design, showing a progress bar to let you know when it is finished.
8. Once the design has been analyzed, select View Impedance Visions to see a color-coded view of the analyzed nets.
The design will visually show you the impedances of every trace you added for analysis. We see that most traces fall within
the 58 Ohm to 75 Ohm impedance range while some traces are in the 110+ Ohm range.
4 www.cadence.com
OrCAD X High-Speed Digital Design Guide
