Hi The idea is partly to lock the two devices. The bigger objective is to hold the mixer output at the correct zero volt operating point.
Cabling things to a different device and then doing phase correction to keep things at zero would be a major pain. Bob > On Jul 7, 2022, at 5:52 AM, Mike Monett via time-nuts > <[email protected]> wrote: > > You wrote: > >> Mike. >> One concern I have with active components as mixer is noise. For an SA I >> designed only a passive DB diode mixer had low enough output noise. Would a >> PF detector as being an active component, not create more noise as output? >> Erik > > Eric, you do not have to give up your double balanced mixer. You can use a > phase/frequency detector to lock the reference to the DUT, and still use > the DBM to do the phase noise analysis. > > Here is a block diagram of the circuit: pna.png > > I don't know if this is going to work, so I will send this email and wait > for it to show up in the lists. If it does, I have a lot more information > for you. > > > > > > > > > <PNA.png>_______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe send an email to [email protected] _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe send an email to [email protected]
