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A phase-locked loop or phase lock 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 keeping the input and output frequencies the same, thus a phase-locked loop can also track an input frequency.
At its simplest, a phase-locked loop is a closed-loop feedback control circuit that's both frequency- and phase-sensitive. A PLL is not a single component, but a system that consists of both analog and digital components -- interconnected in a " negative feedback " configuration.
Phase-locked loop (PLL) circuits exist in a wide variety of high frequency applications, from simple clock clean-up circuits, to local oscillators (LOs) for high performance radio communication links, and ultrafast switching frequency synthesizers in vector network analyzers (VNA).
The phase locked loop or PLL is an electronic circuit with a voltage controlled oscillator, whose output frequency is continuously adjusted according to the input signal’s frequency. A Phase locked loop is used for tracking phase and frequency of the input signal. It is a very useful device for synchronous communication.
Phase Locked Loop (PLL) is one of the vital blocks in linear systems. It is useful in communication systems such as radars, satellites, FMs, etc. This chapter discusses about the block diagram of PLL and IC 565 in detail.
Mar 9, 2018 · This article introduces a phase-based feedback system that plays an important role in many applications. Most of us have seen the phrase “phase-locked loop” (or its abbreviation, PLL).
The phase-locked loop detector compares the input frequency and the output frequency of the VCO to produces a DC voltage which is directly proportional to the phase distinction of the two frequencies.
A phase-locked loop is a feedback system combining a voltage controlled oscillator (VCO) and a phase comparator so connected that the oscillator maintains a constant phase angle relative to a reference signal. Phase-locked loops can be used, for example, to generate stable output high frequency signals from a fixed low-frequency signal.
Phase-locked loops. By Prof. Saurabh Saxena | IIT Madras. Learners enrolled: 1097. ABOUT THE COURSE: This course will emphasize on developing intuition behind frequency synthesizer design, learning mathematical basis behind operation, and realizing PLLs at architecture and circuit level.
May 22, 2022 · A phase-locked loop (PLL) is a feedback system in which the frequency and phase of an output signal is related to the frequency and phase of an input signal. The block diagram of a PLL is shown in Figure \(\PageIndex{1}\).
