Clock-synchronization digital phase-locking method and device

Abstract

The invention relates to the technical field of phase locking, in particular to a clock-synchronization digital phase-locking method and a device. The method comprises the following steps: firstly, comparing the phases of a reference signal and a feedback signal according to a gliding window; judging that the phase of the feedback signal is a leading phase, a lagging phase or an identical phase relative to the phase of the reference signal; generating an error signal for presenting the three messages; secondly, adjusting the phases of the error signal and the feedback signal and outputting the signals with the adjusted phases as a first output signal; thirdly, processing the first output signal by frequency division, generating the feedback signal, the gliding window for comparing the phases of the reference signal and the feedback signal and the second output signal output to the exterior; and continuing the first step. The technical scheme of the invention occupies less logic units and can rapidly lock up the phases and effectively prevent the feedback signal to approach to the reference signal in a damped oscillation mode.

Description

technical field [0001] The present invention relates to the technical field of signal phase locking, in particular to a clock synchronous digital phase locking method and device. Background technique [0002] In the fields of communication, instrumentation, automatic control, etc., it is often necessary to use signal phase-locking technology to process various input signals. The signal phase-locked loop circuit is a commonly used signal phase-locking technology, such as clock synchronization in data reception. attached figure 1 is a block diagram of an existing digital phase-locked loop, as attached figure 1 As shown, a general digital phase-locked loop includes: a phase detector, which is used to compare the phase difference between the input reference signal and the feedback signal, and outputs an error signal representing the phase difference; low-pass filter, low-pass filter Immediately after the phase detector, it is used to filter out the low-frequency signal in the...

AI Technical Summary

Problems solved by technology

The method of adding no-operation can play a very good role when the phase difference between the reference signal and the feedback signal is not large. When the phase difference between the reference signal and the feedback signal is relatively large, the locking time will be increased.

Moreover, there are a large number of no-operation instructions, which will reduce the sensitivity of the phase-locked loop

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