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

[Erik Kaashoek]

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

Thanks for the excellent references, a lot to study.

Yes, one can do very advanced cross correlation things but I am doing 
this for a hobby and just needed something to check if the phase noise 
of some oscillators was good enough and could be build in a couple of 
hours using point to point wiring and a perforated board so I tried the 
least complex Phase Noise analyzer I could think of.

Erik.
On 4-7-2022 15:49, Mike Monett via time-nuts wrote:
> Thank you for your detailed description. I wonder what kind of phase
> detector you are using. I have never heard of one that required 0.01Hz
> phase offset to lock. Even the simplest Phase-Frequency Detector (PFD)
> would do orders of magnitude better. Here are some papers:
>
> 1. Motorola App. Note AN-535
> Phase-Locked Loop Design Fundamentals
> - the original mother lode on phase-frequency detectors
> - does not discuss deadband
> - I corrected this problem in my patent US3810234A
> https://www.nxp.com/files-static/rf_if/doc/app_note/AN535.pdf
>
> 2. HCT4046A phase-locked loop (PLL)
> Appendix B on Page 42: Loop Parameters and Equations
> Appendix C on Page 45: Basic Program for VCO Frequency Calculations
> https://www.ti.com/lit/an/scha003b/scha003b.pdf
>
> 3. Motorola MCK12140 Phase-Frequency Detector description
> https://pdf.dzsc.com/MCH/MCH12140.pdf
>
> 4. I prefer the filter network shown at the bottom of
> Table 2 on Page 4: Integrator Lead/lag network
> https://www.minicircuits.com/app/VCO15-10.pdf
>
> 5. You mentioned the difficulty in getting a low enough noise floor
> to measure the noise floor of the DOCXO. Rubiola has a nice paper on
> cross-correlation techniques that can easily add 20 dB to your measurement
> range:
> https://arxiv.org/pdf/1003.0113.pdf
>
> He shows some circuits in Figure 14 on Page 25: Basics schemes for the
> measurement of phase noise.
>
> Hope this helps.
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