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Typically DC-DC convertor will have one dominant tone output like 3rd or 5th harmonic, etc. Given today efficient DC-DC convertors operates at > 1MHz
it is much easier to filter the spurs with reasonable size low-ESR capacitor, which was not the case when DC-DC convertors operated at 50 KHz!
Obviously >1 MHz DC-DC convertor can’t generate multiple of UIs into SerDes output and pass limits we already have in place!