Method and equipment for outputting clock signals

Abstract

The embodiment of the invention relates to the technical field of communication, in particular to a device and equipment for outputting clock signals, which are used for solving the problem that the clock signals are difficult to output after a reference signal is lost in the prior art. The method disclosed by the embodiment comprises the following steps of: determining a digital value, which determined at the last time before the reference signal is lost, for controlling voltage output of a digital-to-analog converter DA and a regulation parameter value which is determined at the last time; in each interrupt time, determining the actual frequency value of a voltage controlled crystal oscillator according to the digital value and the regulation parameter value; and when the difference value of two adjacent determined actual frequency values of the voltage controlled crystal oscillator is equal to the change frequency value with minimum resolution of the DA, regulating the digital value in the current interrupt time according to the minimum step size of the DA, and outputting the clock signals according to the digital value. According to the method disclosed by the embodiment of the invention, the accuracy in outputting the clock signal after the reference signal is lost can be improved.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a method and device for outputting a clock signal. Background technique [0002] For a digital communication network, it needs to provide a variety of services for different applications, from common services to intelligent value-added services, from voice services to comprehensive services such as data and images. The coexistence of multiple services makes the system clock more and more important . [0003] A stable clock signal is the basis for ensuring the normal operation of various devices in the communication network. If there is no accurate clock signal, digital information will inevitably have errors and slippages during the transmission process, resulting in a decline in communication quality. [0004] The commonly used clock holding method is to use a high-temperature voltage-controlled crystal oscillator or a rubidium clock to output a clock signal according to ...

AI Technical Summary

Problems solved by technology

[0007] Embodiments of the present invention provide a method and device for outputting a clock signal to solve the problem in the prior art that it is difficult to output an accurate clock signal after the reference signal is lost

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