[time-nuts] Re: DIY Low offset Phase Noise Analyzer (Erik Kaashoek)

[Bob kb8tq]

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 at 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>_______________________________________________
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