by Hany Fahmy and Colin Warwick of Agilent Technologies, Inc. and Jack Carrel, Ray Anderson, Harry Fu, and Romi Mayder of Xilinx, Inc.
Xilinx

The purpose of a Power Distribution Network (PDN) is to provide power to electrical devices in a system. Each devicein a system not only has its own power requirements for its internal operation, but also  a requirement for the input voltage fluctuation of that power rail. For Xilinx Kintex™-7 and Virtex®-7 FPGAs, the analog power rails have an input voltage fluctuation requirement of not more than 10 mV peak-to-peak from the 10 kHz to the 80 MHz frequency range. The self- generated voltage fluctuation on the power rails is a function of frequency and can be described by Ohm's Law: Voltage (frequency) = Current (frequency) * Self-Impedance (frequency).

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