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BVola's avatar
BVola
Icon for New Contributor rankNew Contributor
5 years ago

Power Delivery Network tool says I need very few capacitors.

Running PDN for Cyclone IV results show only 4 capacitors required, based on results from EPE. I can even change current to 1 amp and it still only requires 5 caps. Is this right? PDN attached.
ak6dn's avatar
ak6dn
Icon for Regular Contributor rankRegular Contributor
5 years ago

Well in that case I don't believe the spreadsheet at all. A 1.2V Vcore at 20mA and a recommended 5ohm target impedance for the power rail are completely unrealistic values. I don't know what inputs you fed into Quartus to generate this spreadsheet but I would go back to the source. Something in your core and I/O clock setup is not correct.