[time-nuts] How to measure phase noise of HCMOS oscillators?

Magnus Danielson magnus at rubidium.dyndns.org
Tue Mar 11 07:02:17 EDT 2014

On 10/03/14 16:33, Anders Time wrote:
> A while a go i bought some low phase noise Crystek CVHD-950 and now I want
> to meas the phase noise of the oscillators.
> Is it best to try to impedance match the output signal and filter and
> amplify the hcmos before i feed it in to the phase detector? or Just hope
> that the signal is high enough to drive the mixer? What about all the
> harmonics? Does it alter the phase noise result?

What phase detector do you have? It depends.

For a DBM you don't want to overdrive it, I expect that to give you 
excess flicker noise. I expect overtones to mix with white noise.

What frequency and by the way, what is the rest of the setup?


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