PLL

phase-locked loop

PLL

(Phase-Locked Loop) An electronic circuit that compares an input frequency and phase to a reference signal. It then generates a voltage proportional to the difference between the input and the reference. PLLs are used in myriad digital and mixed mode (analog and digital) applications as regulators, demodulators, synchronizers and frequency multipliers and dividers. For example, in a superheterodyne FM radio, a PLL is used to lock the local oscillator to an accurate frequency reference such as a crystal or ceramic resonator. It can also be used to demodulate the FM audio and stereo subcarrier signals from the intermediate frequency (IF) stage. See heterodyning.

PLLs in an FM Radio

This example shows how PLLs are used for regulation and demodulation in an FM radio tuned to 101.5 MHz. The FM frequency range is 88-108 MHz, and this example uses a 10.7 MHz intermediate frequency (IF) and a 1 MHz reference frequency.

PLL

Acronym	Definition
PLL➣Phase-Locked Loop
PLL➣Parts List (TMINS)
PLL➣Polskie Linie Lotnicze (Polish Airways)
PLL➣Pretty Little Liars (TV show)
PLL➣Prolymphocytic Leukemia
PLL➣Posterior Longitudinal Ligament
PLL➣Physical Link Layer (Optical Internetworking Forum)
PLL➣Partia Lëvizja e Legalitetit (Movement of Legality Party, Albania)
PLL➣Potential Loss of Life (risk assessment)
PLL➣Phase Locked Loop
PLL➣Preselection List Length
PLL➣Prima Logic Language
PLL➣Pre Linked Library
PLL➣Pollution Legal Liability
PLL➣People's Law Library (Maryland)
PLL➣Peace, Love & Light
PLL➣Permute Last Layer (Rubik's Cube)
PLL➣Permutation of the Last Layer (Rubik's Cube)
PLL➣Prelinked Library (File Name Extension)
PLL➣Passenger Legal Liability (insurance)
PLL➣Process Liquid Level
PLL➣Parameter List Length
PLL➣Product Literature Library (Eaton)
PLL➣Plasma Lock Load
PLL➣Permanent Logical Link
PLL➣Precision Lighting Ltd. (UK)
PLL➣Programmatic Lessons Learned
PLL➣Parts Load List
PLL➣Prescribed Load Listing
PLL➣Preliminary Load List
PLL➣Production Load List (US Army)
PLL➣Primary Load List (US DoD)