Hidden oscillations in PLL

This example reveals limitations of MATLAB simulation of PLLs.

This examples demonstrates limitations of PLL simulation in MATLAB. Simulation of the same model of 2-phase PLL gives qualitatively wrong (false) results with default simulation step (sampling step).
Complete description of the model and mathematical explanation can be found in arxiv.org/pdf/1506.02484
How to run this example:
1. Open "phase_portret_pll_hidden.m" file in MATLAB. Run this script.
This script initialize parameters and plots phase portrait of 2-phase PLL. Phase portrait consists of three trajectories with different initial conditions of filter.
2. Open "pll_hidden_new.slx". Run simulation. Change simulation step to "auto" and back to "1e-3". You should see different results in the output of filter.