Power Integrity ( PI ) Analysis at System Level
Power Integrity is not a new term in high-speed digital design and analysis. Ever increasing count of PCB layout planes, form factor limitation, high IC density, cost constraint are few of many factors which results in complex electronic designs.
Power integrity ( PI ) Analysis is sometimes assumed as a sub discipline of Signal Integrity, but as they are coherently related they have distinctive features of their own which are to be done in different ways. Signal Integrity analysis is based on transmission lines whereas in Power Integrity analysis we are dealing with power distribution through transmission planes.
Power Integrity can identify the potential problems and with appropriate modifications and validations the analysis can be done again, this trial and error approach helps to identify problem on virtual prototypes and saves in turn cost of actual manufacturing and later re-spin of boards.
As explained in one of the white papers as per IEEE EMC symposium the complete definition of power integrity for a power delivery network can be defined as:
- A power delivery network (PDN) has to deliver sufficiently clean power supply to ICs.
- The PDN has to provide low noise reference path to signals.
- The PDN should not radiate excessively.
Depending on the above definition the Power Integrity analysis has different types of simulations which can be listed as:
- DC Power Integrity ( IR-Drop analysis) : Analysis of trace and plane shapes to determine how much voltage is lost due to the resistance of copper.
- Decoupling analysis : To meet low impedance requirements.
- Noise analysis : Noise analysis of IC Power pins or from via to another.
For high-speed and highly-reliable PCB design it is essential to perform pre-layout PDN analysis and Power Integrity analysis is a must for it.
Argus Systems is leader in PCB and system-level design and analysis Services offering Power Integrity Analysis, SI analysis, Thermal Analysis, Cross-talk analysis, EMI Analysis, Reliability, availability and maintainability analysis for applications like Defense, Space, Avionics, Networking,Telecom, Industrial, Medical, Semiconductor, Robotics, Computing and Automotive.