Choosing the right power supply for your FPGA
With highly demanding supply rail requirements, FPGAs can present design engineers with a huge challenge at the system level, but help is at hand. By Viral Vaidya.Fiel
As programmable logic devices and FPGAs assume the role of a system on a chip on your board, powering these devices is comparable to powering an entire system. High-end FPGAs such as the Xilinx Virtex M series and the Altera Stratix series easily have ten to15 unique rails. Lower-density FPGAs such as the Xilinx Kintex and Spartan series, or the Altera Arria and Cyclone series, can have between two to10 rails depending on the application.
With FPGAs varying so greatly, it is critical that you choose the right power supply for each application. You must define the set of power regulators for the overall power level of each rail, the rails’ sequencing requirements, and system power-management needs. Moreover, as process technology nodes become smaller in FPGAs, tighter tolerances are needed on the voltage-supply rails. This is why regulators with 1% regulation accuracy across line/load and PVT variations are so critical.
If this abstract has piqued your interest, read the full article online in the August issue of Electronic Specifier Design, by clicking here.