Method and device for judging phase-locked loop locking state

A locked state and phase-locked loop technology, applied in the field of phase-locked loops, can solve the problems of inability to detect the narrow pulse of the phase detector and the loss of the reference clock, and achieve the effect of solving the problem of accurate detection

Active Publication Date: 2020-07-28
BEIJING VIMICRO ARTIFICIAL INTELLIGENCE CHIP TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The disadvantage of the lock detection method of the above-mentioned second phase-locked loop is: the judgment method is simple, and the result of the judgment is only two cases of lock and non-lock
There is a problem that the loss of reference clock does not report the loss of lock, and the narrow pulse of the phase detector cannot be detected.

Method used

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  • Method and device for judging phase-locked loop locking state
  • Method and device for judging phase-locked loop locking state
  • Method and device for judging phase-locked loop locking state

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Embodiment Construction

[0034] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0035] Those skilled in the art will understand that unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the word "comprising" used in the description of the present invention refers to the presence of said features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, Integers, steps, operations, elements, components, and / or groups thereof. It will be understoo...

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Abstract

The embodiments of the invention provide a method and a device for determining whether a phase-locked loop is locked. The method includes the following steps: detecting a UP pulse and a DOWN pulse output by a phase detector of a phase-locked loop, and subtracting the DOWN pulse from the UP pulse to get a net phase; and determining whether the width of the net phase is smaller than a set locking judgment threshold, and if the width of the net phase is smaller than the set locking judgment threshold, determining that the phase-locked loop is locked. A digital detection technology is adopted in the embodiments of the invention. The UP pulse and the DOWN pulse output by the phase detector are sampled, the net phase is obtained by subtracting the DOWN pulse from the UP pulse, and whether the phase-locked loop is locked is determined according to the width of the net phase. By increasing the VCO (Voltage Controlled Oscillator) frequency of the phase-locked loop, the problem on how to detect a digital narrow pulse precisely is solved.

Description

technical field [0001] The invention relates to the technical field of phase-locked loops, in particular to a method and a device for judging the locking state of the phase-locked loop. Background technique [0002] The function of PLL (Phase-Locked Loop) is to make the phase of the clock on the circuit the same as that of an external clock. The phase-locked loop is a typical feedback control circuit, which uses the reference signal input from the outside to control the loop internal The frequency and phase of the oscillating signal realize automatic tracking of the frequency of the output signal to the frequency of the input signal. Phase-locked loops are generally used in closed-loop tracking circuits, which is a method to stabilize the frequency in radio transmission. [0003] In the practical application of the phase-locked loop, it is necessary to perform lock detection on the phase-locked loop. At present, the first locking detection method of the phase-locked loop i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03L7/091
CPCH03L7/091
Inventor 杨建明夏昌盛
Owner BEIJING VIMICRO ARTIFICIAL INTELLIGENCE CHIP TECH CO LTD
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