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.
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