What is PLLs?

A Phase-Locked Loop (PLL) is a control system that generates an output signal whose phase is related to the phase of an input signal. It is commonly used in radio, telecommunications, computers, and other electronic devices to synchronize signals, generate stable frequencies, or recover signals from a noisy communication channel. PLLs find applications in frequency synthesis, FM demodulation, clock recovery, and various other areas where precise frequency or phase control is required.