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A synchronous clock device

A technology for synchronizing clocks and synchronizing signals, applied in synchronous devices, time-division multiplexing systems, digital transmission systems, etc., can solve problems such as inaccurate output clock signals, improve stability and reliability, improve accuracy, The effect of improving reliability

Active Publication Date: 2021-07-13
INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The embodiment of the present invention provides a synchronous clock device, which solves the technical problem of inaccurate clock signal output by the synchronous clock device in the prior art after the GPS module is lost

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Embodiment Construction

[0060] The embodiment of the present invention provides a synchronous clock device. In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0061] refer to figure 1 As shown, the embodiment of the present invention provides a synchronous clock device, including: positioning module 1, digital frequency synthesizer 2, constant temperature crystal oscillator 3, FPGA (Field-Programmable Gate Array, Field Programmable Gate Array) 4, temperature sensor 5.

[0062] The positioning module 1 is used to receive a positioning signal from a positioning service system, and generates a synchronization signal source based on the positioning signal; a digital frequency synthesizer 2 is used to lock the synchronization signal source; a constant temperature crystal oscillator 3 is used to provide The digital frequency synthesizer 2 provides the...

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Abstract

The invention discloses a synchronous clock device, comprising: a positioning module, which receives a positioning signal from a positioning service system, and generates a synchronization signal source based on the positioning signal; a digital frequency synthesizer, which locks the synchronization signal source; a constant temperature crystal oscillator, which provides The digital frequency synthesizer provides the original system clock signal; the field programmable gate array, in the time period when the positioning signal is lost, outputs the predicted frequency adjustment word that drives the DDS in the digital frequency synthesizer until the positioning signal is found again; Before the synchronization signal source, provide the DDS with the preset frequency adjustment word for driving the DDS, and output the first frequency adjustment word for driving the DDS under the action of the synchronization signal source during the time period when the synchronization signal source exists; the digital frequency synthesizer output The word first target clock signal is adjusted according to the frequency. The technical problem of inaccurate clock signal output by the synchronous clock device in the prior art after the GPS module is lost is solved.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a synchronous clock device. Background technique [0002] For a wireless communication system in a TDD (Time-division Duplex, time-division duplex) mode, accurate clock synchronization is crucial to the realization of system functions and the improvement of performance. The synchronization of the system mainly includes the synchronization between the base station and the controller, between the base station and the base station, and between the base station and the terminal. For example: for TD-LTE (Time Division Long Term Evolution, Time Division Long Term Evolution) base stations, all base stations need to meet the time synchronization accuracy of 3us and the frequency accuracy of 0.05ppm. [0003] The current solution for synchronization technology is to receive the 1PPS signal on the satellite through the GPS module, and then pass the 1PPS signal on the satellite and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L7/033H04J3/06
CPCH04J3/0644H04L7/033
Inventor 戴鹏飞柴旭荣邱昕慕福奇
Owner INST OF MICROELECTRONICS CHINESE ACAD OF SCI