Nonlinear parameter regulating phase-locked loop method and device

Abstract

The present invention provides a method and a device for regulating the phase-locked loop with non-linear parameter; the present invention is used for realizing the clock synchronization between the local clock and the network clock; the method comprises that the function list of a non-linear PI regulator is prefabricated and the function calculation data list is stored in a non-volatile memory in advance; the phase difference between the reference clock and the local output clock is detected cyclically. The gain parameter of the present PI control link obtained by the data list stored in advance is consulted according to the phase difference and the parameter is substituted into the PI control link to calculate the controlling quantity. The method and the device of the present invention, by presetting the non-linear algorithm parameter list, obtains the gain parameter value of the PI control link at every phase error point; the anti-interference capability is greatly increased compared with the original one; the dynamic response capability of the phase-locked loop is promoted, the regulating time and the overshoot are further reduced; moreover, the robust property of the phase-locked loop is enhanced.

Description

technical field [0001] The invention relates to the technology in the field of digital communication, more specifically, a method and a device for realizing clock synchronization between a local clock and a network. Background technique [0002] With the rapid development of the communication network, especially the development of the clock synchronization private network, the timing equipment based on PLL technology has also been greatly developed, and various algorithms and devices for adjusting the phase-locked loop have also emerged as the times require, which greatly improves the performance of conventional phase-locked loops. [0003] Usually, in the field of communication, the transmission and exchange of information is accomplished through frequency bearing and time division multiplexing. Therefore, various indicators such as frequency and timing accuracy are crucial to both transmission efficiency and transmission quality. Almost all communication devices rely on ...

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Problems solved by technology

[0005] The patent documents in the prior art include: the Chinese patent application whose patent application number is 200710000194.5 "a method for adjusting a phase-locked loop and a method for adjusting a phase-locked loop device”, the patent application has the following deficiencies: 1. The patent uses fixed adjustment parameters to substitute into the algorithm for calculation. Oscillation of the loop; 2. In the implementation of this patent, when the degraded judgment is made on the reference reference source, the phase drift under normal conditions of the input reference is not considered, and the conditions for degraded judgment are not considered at the same time, it is possible introduce misjudgment

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