General
Phase-locked loop

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E328 V1 Article

General
Phase-locked loop

Author : André PACAUD

Review date: April 16, 2015 | Lire en français

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1. General

1.1 Schematic diagram

The phase-locked loop consists of three elements (figure 1). The function of the device is to slave the instantaneous phase ψs of a signal ys delivered by an oscillator to the instantaneous phase ψe of an input signal ye .

ye and ys are assumed to be sinusoidal or square wave signals, of instantaneous phase ψe and ψs respectively, and we can define the instantaneous pulsations ωe and ωs of the two signals :ωe=dψ0dt            ωs=dψsdt

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