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As FPGAs increase in sophistication to provide additional features such as Phase-Locked Loops (PLLs), memory interfaces, and transceiver functionality, the power requirements and designs for FPGAs are becoming more challenging. These include multiple power rails for specialty blocks and circuitry, multiple voltage levels, and increased current requirements. This paper discusses how to identify the various rails associated with Altera devices, analyze the power requirements, and select the appropriate voltage regulator modules, then walks through a design example for a Stratix IV FPGA.
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