Estimating Phase Noise Using a Phase-Domain PLL Model

Learn how to leverage a phase-domain PLL model in Simulink® to estimate phase noise. The linearization capability in Simulink Control Design™ is used to compute a coupled set of transfer functions in the form of a state-space object. The phase-domain model is treated as a multi-input single-output (MISO) system. The inputs model perturbations at various nodes in the PLL. The effect of noise disturbances on the reference input, charge pump, loop filter, and VCO is analyzed to see what effect such noises have on the PLL’s overall phase noise.
The advantage of this approach is that no transfer functions need to be manually computed. Further, all system connections can be described quickly in graphical form making the model easy to create, modify, and share across teams.
You can download the R2022b example used in this video here:
github.com/ksc...
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[@soon-giljung1242]

Hi Kerry, Do i need to install Mathwork R2024a verison than R2023b(I installed) for your example of Simulink file? How can i get two of *.m file as the reference?!?

[@mehdiAbderezai]

There is a fault here. The VCO phase noise that is hard coded is actually filtered values. A stand alone phase noise for a VCO has its noise power drop by 30dB per dec at low freq and then 20dB after the knee freq, and then thermal noise takes over with white noise. In the example the phase noise of VCO is raised by 30dB per decade. Then the transfer function that is applied to it is VCO to VCO which is 1. In practice, you would measure or simulate the stand alone VCO noise and then put it in Matlab and the loop will suppress the phase noise for you. I don't think the method described here is correct.

[@JackChen-ot2dz]

where can I get this ".m" example?

[@kerryon1213]

There is now a github link in the description which was originally missing. Now it's there. My apologies for the initial oversight.