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3 Nov 2016 Phase locked loop basic concepts - phase. The key to the operation of a phase locked loop, PLL, is the phase difference between two signals, and the ability to detect it. The information about the error in phase or the phase difference between the two signals is then used to control the frequency of the loop. Linear Integrated Circuits Applications Phase Locked Loop IC - Learn Linear Integrated Circuits Applications in simple and easy steps starting from basic to The Phase Locked Loop concept was first developed in 1930. Since then it is used in communication systems of different types, particularly in satelliteFigure 1 contains a block diagram of a basic PLL frequency multiplier. The operation of this circuit is typical of all phase locked loops. It is basically a feedback. 24 Nov 2013 Note: An updated (and simpler) version of this tutorial can be found here . This tutorial explains how to write and simulate a phase-locked loop The other input in this example is a fixed reference signal. The error detector compares the signals at both inputs. When the two signal inputs are equal in phase and frequency, the error will be constant and the loop is said to be in a “locked” condition. Why Are Digital Phase-Locked Loops Interesting? ? Performance is important. - Phase noise can limit wireless transceiver performance. - Jitter can be a problem A phase-locked loop or phase lock loop (PLL) is a control system that generates an output .. that allows a reliable indication of an out of lock condition. An XOR gate is often used for digital PLLs as an effective yet simple phase detector. 10 Feb 2012