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
On Tue, Jul 5, 2022, 18:20 Mike Monett via time-nuts < time-nuts@lists.febo.com> wrote: > You stated: > > Mike, > The phase detector is an ADE-1 mixer, the IF output of the mixer goes > into a loop filter that has a corner frequency of about 0.2Hz to enable > Phase noise measurements down to 1Hz offset > > That is your problem. A double balanced mixer is an exclusive-or phase > detector. The lock range is determined by the loop bandwidth, as you have > found. > > The phase-frequency detector is completely different. It will lock to any > signal in the lock range, independent of loop bandwidth. You can have a > bandwidth of 0.001 Hz, and it will still lock. Think of what this could do > for your phase measurements. > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-le...@lists.febo.com > _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send an email to time-nuts-le...@lists.febo.com
