Loop release
Phase-locked loop

Let's assume the loop is hooked and subjected to an input phase ϕ_e . If the variations in the phase ϕ_e are too great, the loop no longer follows and stalls: we then lose synchronism between the signals y_e and y_s .

Often, we're interested in pulsation stall: with the loop hooked, we slowly vary the pulsation of the input signal and watch when we lose synchronism.

The pulsation stall (or synchronization) range is the maximum pulsation deviation Δω_max (on either side of pulsation ω₀ ), from the loop's rest pulsation ω₀, that a previously hooked loop can follow.