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.

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 <time-nuts@lists.febo.com> 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 -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-leave@lists.febo.com