FPGAs are used in many modern systems and offer big advantages over other processing solutions in their flexibility. With shrinking process geometries, FPGAs can support ever larger amounts of digital logic. Advanced packaging techniques enable high pin counts, supporting large numbers of inputs and outputs. As a result, powering FPGAs has become more complex with different power rails, each having their own unique requirements. This product training module examines techniques and solutions to easily solve these different requirements. Each FPGA manufacturer uses its own terminology for the different rails, so the following terms will be used throughout this product training module: “Core” represents the processor and logic fabric on the FPGA. With the latest process nodes, the voltage ranges are quite low with very high accuracy requirements and robust transient performance due to the dynamic nature of the digital load. Current demand can be high when the logic fabric is large. “Auxiliary” represents the noise-sensitive analog circuits in an FPGA such as phase-locked loops. Current requirements are comparatively low, but ripple voltage must be minimized as this causes phase-locked loops to exhibit jitter. “I/O” represents the various inputs and outputs found on the chip. The external devices that the FPGA interfaces with defines the voltage level needed. Current demand varies depending on the type, number and speed of I/Os. “High-speed transceivers” are gigabit transceivers which add a low noise requirement.