Considerations for Capacitor Selection in FPGA Designs

摘要

Passive power bypass networks perform the critical system function of maintaining power rail stability in the face of IC switching currents. Traditionally, two terminal MLCC capacitors have provided an affordable and adequate bypass solution. However, FPGA capacity growth, coupled with ever decreasing power rail voltages imposes new low-impedance requirements that challenge both the economy and efficacy of traditional MLCC bypass capacitor solutions. We demonstrate economical realization of new generation low impedance power delivery, and the incomparable advantages that low-inductance capacitors offer towards: lower cost, reduced space, higher performance and improved manufacturability.