Fact #1) the TPLL uses Freq not phase,
Warren, can you please clarify. From what I can see it actually uses a Minicircuits phase detector, right? That suggests what is being observed is a phase difference between the DUT and the REF, not a frequency difference. That analog phase measurement is then filtered and amplified into a pre-calibrated EFC correction to the REF which over a short time reduces the phase difference as seen by the phase detector. The digital stream comes from an ADC is connected to the EFC. So what does it mean to say "TPLL uses Freq not phase"? It looks to me like it uses both. /tvb _______________________________________________ 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.