> 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.
The VCO tuning voltage is proportional to frequency, as the VCO acts as an integrator in a type-2 PLL like this one. (Remember that the phase detector is on the other side of the VCO.) -- john, KE5FX _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
