A method for improving the aging drift rate of a crystal oscillator
A crystal oscillator and crystal resonator technology, applied in power oscillators, electrical components, etc., can solve the problems of different aging drift rates and different aging drift laws, and achieve the improvement of aging drift rate and long-term frequency stability. , the effect of high reliability
Inactive Publication Date: 2019-05-10
XIDIAN UNIV
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However, different crystal oscillators have different aging drift rates and turning points. They are not the same batch of crystal oscillators, and their aging drift laws are quite different when their materials and structures are significantly different.
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[0042] according to Figure 1-5 A method for improving the aging drift rate of the crystal oscillator includes the following steps
[0043] Step 1: Collect data
[0044] Synchronously collect the phase difference ΔT and the output frequency f of the resonator of the crystal oscillator;
[0045] Step 2: Establish the functional relationship between the output frequency of the crystal resonator and the running time
[0046] According to the data collected in step 1, the functional relationship between the phase difference ΔT and the running time t, and the relationship between the output frequency f and the running time t are established, and the time factor t is eliminated to obtain the f function relationship between the phase difference change ΔT of the resonator and the output frequency;
[0047] Step 3: Establish the functional relationship between voltage control terminal voltage and frequency
[0048] Control the output voltage to the voltage control terminal of the cr...
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The invention belongs to the technical field of time frequency measurement and control and precision frequency standards, and particularly relates to a method for improving the aging drift rate of a crystal oscillator. The method comprises the following five steps of: collecting data, establishing a function relation between the output frequency and the operation time of the crystal resonator, establishing a function relation between the voltage control end voltage and the frequency, transmitting data and changing the output frequency of the crystal resonator, and calculating a phase difference change according to collected signal data at the two ends of the resonator through trigonometric function operation. No external high-performance frequency source needs to be introduced, and the design is simple and convenient. Long-term frequency change of an oscillator and change correlation between resonance parameters of the oscillator are considered. Changes of resonance parameters of the crystal resonator are derived through changes of the signal phase difference between the two ends of the crystal resonator, then changes of the frequency of the oscillator are calculated, the frequencychanges of the oscillator are adjusted and improved in a feedback mode, and the aging drift index of the crystal oscillator is improved.
Description
technical field [0001] The invention belongs to the technical field of time frequency measurement and control and precision frequency standard, and in particular relates to a method for improving the aging drift rate of a crystal oscillator. Background technique [0002] Time and frequency are the most basic physical quantities, and all aspects of our lives are closely related to time and frequency. Devices capable of generating high-precision frequency signals are called standard frequency sources, including high-precision atomic frequency standards, lower-precision oscillating circuits, and crystal oscillators with quartz crystals as the main resonant device. At present, the quartz crystal oscillator is most widely used in the market because of its low price, high frequency stability and long service life. However, crystal aging has become the main factor limiting the further improvement of high-stability quartz crystal oscillators. The method of correcting the frequency ...
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IPC IPC(8): H03B5/04
Inventor 李智奇周渭吴豪苗苗范凡
Owner XIDIAN UNIV