Phase-locked loop (PLL)

A Phase-Locked Loop (PLL) is an electronic control system that synchronizes an output signal's frequency and phase with a reference signal. It works by comparing the phase of these signals and adjusting the output to keep them aligned. PLLs are commonly used in radio communications, television, and various electronic devices to stabilize frequencies and demodulate signals. Essentially, they ensure that different frequency signals can work together smoothly, enhancing performance and reducing noise or interference. This technology plays a critical role in many modern electronic systems.