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

[Mike Monett]

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.