Start with rail requirements and load behavior. Power integrity connects the regulator, planes, interconnects and decoupling network to the voltage seen at the load. A large capacitor count does not establish that the required impedance is maintained over the relevant frequency range.
Start with these questions
- Which rail and operating mode creates the tightest voltage margin?
- Where are the largest DC drops and transient current loops?
- Which model or measurement will demonstrate the rail requirement?
Read the engineering guides
Apply a tool or checklist
What to keep in the project record
Record the rail budget, load cases, model assumptions and measurement points. Treat simple calculators as screening tools and use a suitable network model and bench validation for acceptance.