Phase-locked Loop

A phase-locked loop (PLL) is a control system that synchronizes an output signal with a reference signal in frequency and phase. It continuously compares the output's phase with the input, and adjusts itself to keep them aligned. PLLs are widely used in electronic devices for tasks like tuning radio signals, stabilizing clock signals in computers, and data synchronization. Essentially, it acts like a smart, automatic tuner that ensures signals stay in sync, maintaining accurate timing and frequency without manual adjustments.