Hi If you are using a simulator, you can *really* get confusing and toss in detector or divider noise floors ….
Bob > On Dec 4, 2014, at 6:45 PM, John Miles <j...@miles.io> wrote: > >> See how Fig 8 and Fig 9 provides two different cross-overs between the >> noise responces, and how the higher bandwidth doesn't have a "hump" just >> because the steered oscillators noise response get's sufficiently >> high-passed by the loop PLL as for the lower PLL it humps up because of >> them having comparable power (amplitudes yes, but their power adds, as >> it is noice). >> >> Maybe it is good enough for your purposes, but yes, I agree there should >> be a better presentation about the problem. > > Another suggestion: fire up ADISimPLL and create a few different designs with > various damping factors and combinations of VCO noise and loop BW. It'll > only take a few minutes, and the resulting plots will show both the > individual and summed contributions of the different noise sources in a way > that will instantly clue people in. > > -- john, KE5FX > Miles Design LLC > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.