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Phase-locked loop control circuit and method

A control circuit and control method technology, applied in the direction of automatic power control, electrical components, etc., can solve the problems of poor stability of phase-locked loop circuits, and achieve the effects of improving response, improving stability, and improving phase-locking range and speed.

Active Publication Date: 2019-01-22
NO 24 RES INST OF CETC
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] The invention provides a phase-locked loop control circuit and method to solve the problem of poor stability of the current phase-locked loop circuit

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  • Phase-locked loop control circuit and method
  • Phase-locked loop control circuit and method

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Embodiment Construction

[0028] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention, and to make the above-mentioned objectives, features, and advantages of the embodiments of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention are described below with reference to the accompanying drawings. Give further details.

[0029] In the description of the present invention, unless otherwise specified and limited, it should be noted that the term "connection" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be a communication between two components, which can be It is directly connected or indirectly connected through an intermediary. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0030] See figure 1 ...

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Abstract

The invention provides a phase-locked loop control circuit and method. The phase-locked loop control circuit comprises a control device, a phase discriminator, a filter and a voltage controlled oscillator, wherein the control device, the phase discriminator, the filter and the voltage controlled oscillator are successively connected; the control device is used for detecting frequencies of a first signal inputted into the phase discriminator and a second signal outputted by the voltage controlled oscillator and controlling and enabling the phase discriminator according to the frequencies of the first signal and the second signal. The phase-locked loop control circuit and method controls and enables the phase discriminator through detecting frequencies of the input signal and the output signal of the phase-locked loop circuit and according to the frequencies of the input signal and output signal, realizes the control of phase-locked loop circuit working based on the input signal and the output signal, improv the capability of handling the abnormal condition of the phase-locked loop circuit, and improve the stability of the phase-locked loop circuit.

Description

Technical field [0001] The invention belongs to the field of integrated circuits, and specifically relates to a phase-locked loop control circuit and method. Background technique [0002] With the continuous development of power electronics, communication, automation and other technologies, phase-locked loop technology is widely used in a large number of electronic communication equipment, automatic control of motor speed, and synchronous collection of data signals and synchronous clocks. However, the phase detector in the traditional phase-locked loop circuit is usually always in working state, that is, the phase-locked loop circuit is always in working state, which causes the phase-locked loop circuit to be unable to deal with the situation that may cause damage to its components, so the current lock The phase loop circuit has the problem of poor stability. Summary of the invention [0003] The present invention provides a phase-locked loop control circuit and method to solve t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03L7/099
CPCH03L7/099
Inventor 宋超廖建军黄超张恒浩刘洋李永
Owner NO 24 RES INST OF CETC
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