| 摘要 |
<p>A method and a device for controlling a crystal oscillator output clock are provided, and the method includes: when the crystal oscillator is in a normal control state, the crystal oscillator voltage-controlled voltage for controlling the crystal oscillator is stored; when the external reference clock is lost, the stored crystal oscillator voltage-controlled voltage is used to control the crystal oscillator. Using the present solution, in the case of losing the reference clock of one second output by a Global Positioning System (GPS) receiver, the crystal oscillator can still control the crystal oscillator voltage-controlled voltage, so as to achieve the effect that the clock is output as stably as possible, and the reliability of the system is improved. The method of the present solution is simple and clear, it is easy to be implemented and without additional hardware and software resource requirements, it can be as a general method, which is used by the Oven Controlled Crystal Oscillator (OCXO) and the Temperature Compensate crystal Oscillator (TCXO) having the GPS reference to continue to output the clock stably when the reference is lost, and the method of the present solution is important for a system which is very strict to the clock, such as Worldwide Interoperability for Microwave Access (WIMAX), etc.</p> |
