High-precision phase-locked loop and phase locking method

Abstract

The invention discloses a high-precision phase-locked loop comprising a frequency discriminator, a phase discriminator, a voltage-controlled oscillation module and a digital processing module. An input signal is inputted from the input ends of the phase discriminator and the frequency discriminator respectively. The output end of the frequency discriminator is connected with the digital processing module. The output end of the phase discriminator is connected with the input end of the voltage-controlled oscillation module. The input end of the voltage-controlled oscillation module is connected with the input end of the digital processing module. The output end of the digital processing module is connected with the feedback end of the phase discriminator. Frequency of an output signal is configured according to frequency of the input signal. Besides, phase difference between the input signals is adjusted via changing frequency change direction of the output signal so that the output signal is enabled to be matched with the input signal and an objective of phase locking is achieved.

Description

technical field [0001] The invention belongs to the field of electronic technology, and in particular relates to a high-precision phase-locked loop and a phase-locked method. Background technique [0002] A Phase-Lock Loop (PLL for short) is a technique for synchronizing frequency and phase by using a feedback control principle. In some applications, the frequency and phase of an output clock signal (output signal) need to be synchronized with an external reference signal (input signal). When the frequency or phase of the input signal is detected to change, the phase-locked loop will detect this change and adjust the output signal through the internal feedback system until the input signal and the output signal are resynchronized. This synchronization is also called " Phase Locked”. At present, phase-locked loops are used in various fields, including: wireless communication systems, data and clock recovery circuits, frequency synthesis circuits, frequency-hopping communica...

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Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a high-precision phase-locked loop and a phase-locked method to solve the problems of unstable phase locking and low phase-locking precision in existing analog phase-locked loops

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