This paper mainly describes several types of high precision clock sources, and the differences between the high-precision clock source and our common clock acquisition source, and illustrates the importance of providing the time synchronization and unification function of the high precision clock source.

In the construction of electronic information, the equipment invested in the long-term use is mainly electronic equipment, including PC, communication equipment, information exchange equipment, financial equipment, etc. these devices often do not own the clock signal source in the design of the devices, so a special clock circuit is needed to replace the clock signals.

For the equipment that has been applied to electronic information construction for a long time, if there is a need to invest in the system for a long time, all equipment must have a traceable chain of time tracks to ensure the precision and integrity of the data in operation. Therefore, many devices of this type are designed for easy use and cost savings through quartz crystal oscillator as the reference clock source for real-time clock circuit, display time and date, which can meet the most daily needs. However, during the independent running process, the accumulated clock error accumulated by each device will increase with each passing day.

To solve this problem, the concept of high-precision clock source is put forward, which is to achieve the demand of high-precision clock source by one or more international or national recognized time datum. Usually we call the high precision clock source first referred to the satellite time benchmark. Currently, the global positioning system (GPS), the GLONASS system, the BeiDou Navigation Satellite System (BDS), and the Galileo satellite navigation system (Galileo satellite navigation system) are the main sources. The most commonly used satellite clock sources in China are mainly based on the radar and the Beidou. With the continuous improvement of China's Beidou satellite, the Beidou satellite will dominate in the future. The use of satellite clock sources in general demand can be based on SYN2302 or SYN2306 satellite receivers.

Besides the reference satellite signal, we need to take account of the fact that some occasions can not erect satellites in long term use. For this high-precision constant temperature crystal oscillator or rubidium atomic clock, as a high-precision clock source, it can rely on the transition between energy levels to maintain relatively high time accuracy and maintain a high precision clock source state when the satellite clock source loses its lock.General requirements include SYN3204 GPS Beidou domesticated rubidium atomic clock, SYN3102 rubidium frequency standard, SYN3305 tamed high frequency crystal oscillator frequency standard and so on.

Besides the above two kinds of popular definition satellites, rubidium atomic clock and crystal oscillator, the high-precision clock source also includes the timing mode provided by the specific protocol or form to the client clock source, including the high precision clock source mode provided by NTP, PTP, IRIG-B code and PCIe.

High precision clock source is usually a high-precision clock source which can not provide a complete uniform travel time for the mechanism and equipment in the system. It is an important foundation for maintaining the order of the information system, and is indispensable for the development of information technology. For more accurate clock source, for more information, please consult our company's business people!

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