A phase-locked loop (PLL) is a control system that generates an output signal whose phase is fixed relative to the phase of an input signal. Keeping the input and output phase in lockstep also implies a constant relationship between input and output frequencies.
A phase-locked loop (PLL) is a control system that generates an output signal whose phase is fixed relative to the phase of an input signal. Keeping the input and output phase in lockstep also implies a constant relationship between input and output frequencies.
Source: Wikipedia "Phase-locked loop" · CC BY-SA 4.0
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