A fractional sequence generator having a plurality of cascaded accumulators whose carry-outs-upon-overflow are provided over a plurality of recombination paths and selective delays to an adder, the pattern of selective delays being modified by the addition of delay elements in all recombination paths...http://www.google.com/patents/US6693468?utm_source=gb-gplus-sharePatent US6693468 - Fractional-N synthesizer with improved noise performance
