explanation

With the miniaturization of manufacturing processes and technologies, the power supply voltage required by FPGAs is becoming lower. Due to the benefits of miniaturization, the number of transistors that can be accommodated has increased dramatically, and the internal operating speed has increased.

In addition, the system bandwidth demanded by the market is becoming wider, and the circuits implemented in FPGAs are becoming larger and faster, resulting in an increase in the power consumption of FPGAs. This is driving power supply requirements to lower voltages and higher currents, and especially for FPGAs manufactured with process technology of 20nm and beyond, power supply requirements are much stricter than before. It is becoming

This document presents design considerations and measurement methods for designs that exceed 20W (20A) at a power supply voltage of 1V or less, and implements such mechanisms in advance to prevent problems from occurring and to facilitate debugging when problems occur. The purpose is to quickly identify and solve problems in Due to the low voltage and high current, it is necessary to consider the power supply selection of the latest FPGA and the measurement method in the evaluation process, which is different from the conventional phenomenon. Stricter "heat dissipation design" and "measurement method" are required.

Note that the explanations in this document assume Arria® 10 and Stratix® 10 as FPGAs, and Enpirion® as power supply devices, but with some exceptions, the explanations are generally applicable/applicable. .

<Contents>

Introduction
Design Flow
Specification confirmation
Estimated maximum power consumption
Bus selection by power supply
Check circuit diagram
layout confirmation
Examination of heat dissipation measures
Debug Flow
Initial operation check
Ripple measurement method
troubleshooting
Defect case
Appendix
Increased operation rate with increased bandwidth
PDN Tool Input
Power fluctuation tolerance for maximum current fluctuation
Voltage measurement point
Confirmation of waveform of power supply
Influence of wiring resistance
Debug Check List
Precautions for power supply separation by coil when power supply is shared
Increased power supply noise and jitter
Drop in Box
Approximate calculation of heat generation of power supply devices

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