Hi If the objective is “phase noise -130 dbc at a 10 KHz offset” and the signal is at 25 MHz, the resultant jitter ( in a 10 KHz bandwidth ) is likely in the < 500 fs range. The CNT-91 is only a 50 ps resolution device.
Since it’s a counter, there is no practical way to vary the bandwidth. You get whatever the internal processing gives you. Even then, at 25 MHz a broadband -130 dbc/Hz phase noise ( 10 MHz bandwidth) is still below 10 ps. Still below the counter’s floor. One of *many* calculators that let you play with jitter from phase noise: https://rf-tools.com/jitter/ <https://rf-tools.com/jitter/> It’s just the first one Mr Google turned up. There may be much better ones out there. Bob > On Jun 19, 2022, at 9:58 AM, Karen Tadevosyan <[email protected]> wrote: > > Hi > >> The CNT-91 has a very high noise floor if you are trying to “see” phase >> noise. > > May be but with this Pendulum CNT-91 I can fix PN degradation in the range > -130 ... -150 dBc/Hz where R&S FSQ8 can do nothing... > > FYI: FSQ8 is not the worst SA: PN floor -130 dBc/Hz @10 kHz on 1 GHz. > > Karen, ra3apw > > > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe send an email to [email protected]
