Frequency Synthesis Anti-Vibration Temperature Compensated Crystal Oscillator
By adopting the design of a frequency-synthesis anti-vibration temperature-complement crystal oscillator in a quartz crystal oscillator, the voltage function generator temperature compensation and phase-locked loop technology, combined with the crystal resonator installed in parallel, the sensitivity of the quartz crystal oscillator to external vibration and other forces is solved, and higher accuracy and stability are achieved.
Patent Information
- Application Number
- CN202411738273.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-04-08
AI Technical Summary
In the prior art, quartz crystal oscillators are susceptible to external vibration, centrifugation and impact forces, resulting in a lack of high-precision quartz crystal oscillators with low acceleration sensitivity.
A frequency synthetic anti-vibration temperature-complemented crystal oscillator is adopted, including source crystal oscillator, frequency synthesizer, loop filter and voltage-controlled crystal oscillator. Through voltage function generator temperature compensation technology and phase-locked loop technology, two matching crystal resonators are connected in parallel, and the X-axis direction of the wafer is installed oppositely in the opposite direction to reduce acceleration sensitivity.
It has achieved the advantage of reducing acceleration sensitivity by one order of magnitude, with wide applicable frequency, good frequency and temperature characteristics, and low vibration phase noise, and is suitable for reference clocks in navigation, communication, radar, and electronic countermeasure systems.
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Figure CN119787978A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of time-frequency electronic components, and in particular to a frequency synthesis anti-vibration temperature-compensated crystal oscillator. Background Art
[0002] At present, quartz crystal oscillators are widely used in various systems as frequency reference sources. In navigation, communication, radar, electronic countermeasures and other systems, vibration-induced phase noise greatly affects signal capture.
[0003] However, in the prior art, the crystal oscillator is affected by external forces such as vibration, centrifugal force and impact, and usually these external forces can be attributed to the influence of acceleration. Therefore, there is a lack of high-precision quartz crystal oscillators with low acceleration sensitivity. Summary of the invention
[0004] The purpose of the present invention is to provide a frequency synthesis anti-vibration temperature compensated crystal oscillator, aiming to solve the technical problem that the crystal oscillator in the prior art is affected by external forces such as vibration, centrifugal force and impact, and usually these external forces can be attributed to the influence of acceleration, so there is a lack of high-precision quartz crystal oscillators with low acceleration sensitivity.
[0005] To achieve the above-mentioned purpose, the present invention adopts a frequency synthesis anti-vibration temperature compensated crystal oscillator, which includes a source crystal oscillator, a frequency synthesizer, a loop filter and a voltage-controlled crystal oscillator. The input end of the frequency synthesizer is connected to the output end of the source crystal oscillator, the input end of the loop filter is connected to the output end of the frequency synthesizer, the input end of the voltage-controlled crystal oscillator is connected to the output end of the loop filter, and the output end of the voltage-controlled crystal oscillator is connected to the frequency synthesizer.
[0006] The frequency synthesizer includes an R frequency divider, a phase detector and an N frequency divider, the output end of the R frequency divider is connected to the input end of the phase detector, and the output end of the N frequency divider is connected to the input end of the phase detector.
[0007] Wherein, by adopting the voltage function generator temperature compensation technology, the source crystal oscillator can reach a stable frequency temperature.
[0008] Wherein, the output frequency of the source crystal oscillator is phase-locked and synchronized to the source crystal oscillator frequency through the phase-locked loop technology.
[0009] Two matched crystal resonators are connected in parallel, and the X-axis directions of the wafers are installed in opposite directions so that the acceleration vectors are anti-parallel to each other, thereby reducing the order of magnitude of the acceleration sensitivity.
[0010] The beneficial effects of a frequency synthesis anti-vibration temperature compensated crystal oscillator of the present invention are: two matching crystal resonators are connected in parallel, and the X-axis directions of the chips are installed in opposite directions so that the acceleration vectors are anti-phase and parallel to each other, so that the acceleration sensitivity can be reduced by one order of magnitude. It has the advantages of wide applicable frequency, good frequency-temperature characteristics, and low vibration phase noise, and can be widely used in navigation, communication, radar, and electronic countermeasure systems as reference clocks. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0012] Figure 1 It is a system diagram of the frequency synthesis anti-vibration temperature compensated crystal oscillator of the present invention.
[0013] 1- source crystal oscillator, 2- frequency synthesizer, 3- loop filter, 4- voltage controlled crystal oscillator, 5- R divider, 6- phase detector, 7- N divider. DETAILED DESCRIPTION
[0014] See also Figure 1 The present invention provides a frequency synthesis anti-vibration temperature compensated crystal oscillator, comprising a source crystal oscillator 1, a frequency synthesizer 2, a loop filter 3 and a voltage-controlled crystal oscillator 4, wherein the input end of the frequency synthesizer 2 is connected to the output end of the source crystal oscillator 1, the input end of the loop filter 3 is connected to the output end of the frequency synthesizer 2, the input end of the voltage-controlled crystal oscillator 4 is connected to the output end of the loop filter 3, and the output end of the voltage-controlled crystal oscillator 4 is connected to the frequency synthesizer 2.
[0015] Furthermore, the frequency synthesizer 2 includes an R frequency divider 5, a phase detector 6 and an N frequency divider 7, the output end of the R frequency divider 5 is connected to the input end of the phase detector 6, and the output end of the N frequency divider 7 is connected to the input end of the phase detector 6.
[0016] Furthermore, by adopting the voltage function generator temperature compensation technology, the source crystal oscillator 1 can reach a stable frequency temperature.
[0017] Furthermore, the output frequency of the source crystal oscillator 1 is phase-locked and synchronized to the frequency of the source crystal oscillator 1 through a phase-locked loop technology.
[0018] Furthermore, two matched crystal resonators are connected in parallel, and the X-axis directions of the wafers are mounted in opposite directions so that the acceleration vectors are anti-parallel to each other, thereby reducing the order of magnitude of the acceleration sensitivity.
[0019] In this embodiment, the temperature compensation voltage curve of the voltage function generator in the chip is matched with the crystal temperature frequency curve in the voltage-controlled crystal oscillator 4 for temperature compensation, which can reach a level of ≤0.5ppm (-40°C to 85°C);
[0020] The reference frequency generated by the source crystal oscillator 1 is input into the phase detector 6 after passing through the R frequency divider 5, and the frequency output by the voltage-controlled crystal oscillator 4 is also input into the phase detector 6 after passing through the N frequency divider 7. The phase detector 6 compares the phases of the two signals, outputs the compared phase difference in the form of voltage, and adds it to the voltage-controlled end of the voltage-controlled crystal oscillator 4 through the loop filter 3, thereby controlling the output frequency of the voltage-controlled crystal oscillator 4;
[0021] Through repeated phase detection and adjustment, the frequency and phase of the output signal of the voltage-controlled crystal oscillator 4 and the input reference signal finally reach consistency. At this time, the phase-locked loop circuit enters a locked state, so that the oscillation output signal is synchronized to the reference signal. The output frequency can be controlled by adjusting N and R. The stability of the output signal is equal to that of the reference signal, and other indicators of the output signal depend on the voltage-controlled crystal oscillator 4.
[0022] Two matched crystal resonators are connected in parallel, and the X-axis directions of the chips are installed in opposite directions so that the acceleration vectors are anti-phase and parallel to each other. This makes the acceleration sensitivity one order of magnitude smaller. It has the advantages of wide applicable frequency, good frequency-temperature characteristics, and low vibration phase noise. It can be widely used as a reference clock in navigation, communication, radar, and electronic countermeasure systems.
[0023] What is disclosed above is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.
Claims
1. A frequency synthesis anti-vibration temperature compensated crystal oscillator, characterized in that: The invention comprises a source crystal oscillator, a frequency synthesizer, a loop filter and a voltage-controlled crystal oscillator, wherein the input end of the frequency synthesizer is connected to the output end of the source crystal oscillator, the input end of the loop filter is connected to the output end of the frequency synthesizer, the input end of the voltage-controlled crystal oscillator is connected to the output end of the loop filter, and the output end of the voltage-controlled crystal oscillator is connected to the frequency synthesizer.
2. The frequency synthesis anti-vibration temperature compensated crystal oscillator according to claim 1, characterized in that: The frequency synthesizer comprises an R frequency divider, a phase detector and an N frequency divider, wherein the output end of the R frequency divider is connected to the input end of the phase detector, and the output end of the N frequency divider is connected to the input end of the phase detector.
3. The frequency synthesis anti-vibration temperature compensated crystal oscillator according to claim 1, characterized in that: By adopting the voltage function generator temperature compensation technology, the source crystal oscillator can reach a stable frequency temperature.
4. The frequency synthesis anti-vibration temperature compensated crystal oscillator according to claim 1, characterized in that: The output frequency of the source crystal oscillator is phase-locked and synchronized to the source crystal oscillator frequency through the phase-locked loop technology.
5. The frequency synthesis anti-vibration temperature compensated crystal oscillator according to claim 1, characterized in that: Using two matched crystal resonators in parallel and mounting the wafers in opposite X-axis directions so that the acceleration vectors are anti-parallel to each other, the order of magnitude of acceleration sensitivity is reduced.