Quote:in the other way do you mean if you have lesser frequency then accumulated period is more?
Exactly.
Quote:Accumulation jitter by its very definition of being an average over time represents low frequency component of the PLL phase noise.
Yes, accumulated jitter is a type of long-term period jitter,
which is an average over time,
which represents low-frequency part of Phase noise spectrum, but of the oscillator & not the in-band noise from CP/PFD/FDN/LF et al.
Reason -- because only VCO jitter is accumulating jitter. Rest is synchronous/edge-to-edge jitter.
Reason -- Because VCO jitter once introduced accumulates & gets corrected only after Tcomp, while edge-to-edge jitter from Driven Blocks like PFD/CP/FDN is a short term jitter whose rms value over a long-term is not so huge. Both accumulated Jitter from VCO + some rms contribution from E-to-E jitter of PFD/CP/FDN gets corrected at Tcomp.
Quote:A higher loop BW results in lower close in phase noise - resulting in lower accumulation jitter : would you agree?
Wrong.
Close-In phase noise / InBand Phase Noise / Noise from PFD/CP/FDN/LF etc. is totally component dependent.
There is an optimum pt. for BW where In-Band Noise cuts Osc. Pnoise.
Any deviations in +- directions from that pt. will result in an increase in Jitter.
--M