Power integrity or PI is an analysis to check whether the desired voltage and current are met from source to destination. Today, power integrity plays a major role in the success and failure of new electronic products. There are several coupled aspects of PI: on the chip, in the chip package, on the circuit board, and in the system. Three main issues must be resolved to ensure power integrity at the printed circuit board level:
- Keep the voltage ripple at the chips pads lower than the specification (e.g. less than +/-50 mV variation around 1V)
- Control ground bounce (also called synchronous switching noise, simultaneous switching noise, or simultaneous switching output (SSN or SSO))
- Control electromagnetic interference (EMI) and maintain electromagnetic compatibility (EMC): the power distribution network (PDN) is generally the largest set of conductors on the circuit board and therefore the largest (unwanted) antenna for emission and reception of noise.
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Power integrity Wikipedia(Text) CC BY-SA