CN104702214A - Crystal oscillator frequency compensation method - Google Patents
Crystal oscillator frequency compensation method Download PDFInfo
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- CN104702214A CN104702214A CN201410851670.4A CN201410851670A CN104702214A CN 104702214 A CN104702214 A CN 104702214A CN 201410851670 A CN201410851670 A CN 201410851670A CN 104702214 A CN104702214 A CN 104702214A
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Abstract
The invention discloses a crystal oscillator frequency compensation method. The method includes the steps: dividing the operating temperature range of a crystal oscillator into a plurality of temperature intervals; establishing the corresponding relationship between operating time and frequency drift of the crystal oscillator at each temperature interval during synchronization; acquiring the current operating time and operating temperature of the crystal oscillator in real time during retention; acquiring the corresponding relationship between the corresponding operating time and the frequency drift; determining aging compensation frequency needed by the crystal oscillator according to the current operating time and the corresponding relationship between the corresponding operating time and the frequency drift. The influence of the operating temperature on the frequency drift is distinguished, so that compensation is more effectively performed, too high requirements on precision of a temperature sensor for monitoring the operating temperature of the crystal oscillator in real time are omitted, compensation accuracy is improved, and cost is reduced.
Description
Technical field
The present invention relates to crystal oscillator technologies field, particularly relate to a kind of method that crystal oscillator frequency compensates.
Background technology
The compensation arrangement of existing crystal oscillator, is generally made up of crystal oscillator module, temperature sensor module, temperature-compensating processing module and oscillator control module.
In temperature sensor module near quartz crystal, thermistor perception temperature change, convert voltage signal to, input to temperature compensation module, temperature compensation module is according to the working temperature-frequency curve of crystal oscillator, generate corresponding compensating signal, to control the concussion frequency of crystal oscillator.
The compensation method of existing crystal oscillator is: in two sections of continuous print operating time sections, writing task temperature, operating time and frequency three parameters, the parameter aging according to the difference acquisition module of the frequency of two operating time sections under identical working temperature point, i.e. the relation of operating time and frequency; And in a fixing operating time section, the parameter aging according to module obtains the ageing parameter in this operating time section, again by working temperature, operating time and frequency three parameters, obtain the frequency change that working temperature causes, i.e. the relation of working temperature and frequency; Then, carry out modeling according to operating time and the relation of frequency and the relation of working temperature and frequency, the model of compensating frequency when obtaining crystal oscillator work.
Adopt the program to need to ensure that the working temperature measured value of temperature sensor is accurate, and working temperature-frequency curve in temperature-compensating processing module is correct, such temperature-compensating processing module could export correct frequency compensation value.But in large-scale application, each temperature sensor has discreteness, and also there is discreteness in the working temperature-frequency curve of crystal oscillator, need to calibrate them, this calibration in wide operating temperature range has significant impact to operating time during large-scale production and production cost.
Summary of the invention
A kind of method that the embodiment of the present invention provides crystal oscillator frequency to compensate, solves above technical problem.
For reaching this object, the present invention by the following technical solutions:
A kind of method that the embodiment of the present invention provides crystal oscillator frequency to compensate, comprising:
The operating temperature range of crystal oscillator is divided into multiple temperature range;
Between sync period, set up the operating time of the crystal oscillator of each temperature range and the corresponding relation of frequency drift;
During maintenance, the operating time that Real-time Obtaining crystal oscillator is current and working temperature;
Determine the temperature range that current working temperature is corresponding;
Corresponding operating time and the corresponding relation of frequency drift is obtained according to the temperature range determined;
The compensation of ageing frequency provided needed for current operating time and the operating time of correspondence and the corresponding relation determination crystal oscillator of frequency drift.
Preferably, described step: between sync period, set up the operating time of the crystal oscillator of each temperature range and the corresponding relation of frequency drift, specifically comprise:
Between sync period, sampling crystal oscillator, in each temperature range, frequency drift under the different operating time, obtains multiple operating time of each temperature range and the corresponding data of frequency drift;
According to multiple operating time of each temperature range and the corresponding data of frequency drift, set up the operating time of the crystal oscillator of each temperature range and the corresponding relation of frequency drift.
Preferably, described step: according to multiple operating time of each temperature range and the corresponding data of frequency drift, set up the operating time of the crystal oscillator of each temperature range and the corresponding relation of frequency drift, specifically comprise:
Respectively matching is carried out to multiple corresponding datas of each temperature range, obtain the operating time of the crystal oscillator of each temperature range and the corresponding relation of frequency drift.
Preferably, described step: after setting up the operating time of the crystal oscillator of each temperature range and the corresponding relation of frequency drift, also comprise:
The working temperature of crystal oscillator and the corresponding relation of drift frequency is set up according to the operating time of the crystal oscillator of each temperature range and the corresponding relation of frequency drift.
Preferably, described step: set up the working temperature of crystal oscillator and the corresponding relation of drift frequency according to the operating time of the crystal oscillator of each temperature range and the corresponding relation of frequency drift, specifically comprise:
According to the operating time of the crystal oscillator of each temperature range and the corresponding relation of frequency drift, obtain the multiple nominal temperature of crystal oscillator under the identical operating time and the associated data of frequency drift;
According to multiple nominal temperature of acquisition and the associated data of frequency drift, set up the working temperature of crystal oscillator and the corresponding relation of frequency drift;
Wherein, each temperature range includes a minimum temperature, a maximum temperature and a nominal temperature; Nominal temperature is the mean value of minimum temperature and maximum temperature, and the maximum temperature of each temperature range is identical with the difference of minimum temperature.
Preferably, described step: after the compensation of ageing frequency provided needed for current operating time and the operating time of correspondence and the corresponding relation determination crystal oscillator of frequency drift, also comprise:
The temperature compensating frequency provided needed for the corresponding relation determination crystal oscillator of the working temperature current according to crystal oscillator and the working temperature of crystal oscillator and frequency drift.
Preferably, described step: after the temperature compensating frequency provided needed for the corresponding relation determination crystal oscillator of the working temperature current according to crystal oscillator and the working temperature of crystal oscillator and frequency drift, also comprise: obtain the current required compensating frequency of crystal oscillator according to the compensation of ageing frequency determined and temperature compensating frequency.
The beneficial effect that the technical scheme that the embodiment of the present invention provides is brought: the present invention is by the corresponding relation of the operating time and frequency drift of setting up the crystal oscillator of each temperature range between sync period, the i.e. model of frequency aging, during keeping, first the temperature range belonging to working temperature is determined, temperature range belonging to working temperature obtains corresponding operating time and the corresponding relation of frequency drift, and then determine the compensation of ageing frequency of crystal oscillator, to distinguish the impact that working temperature is brought to frequency drift, the impact that working temperature brings to frequency drift can also be obtained by the model of each frequency aging set up, finally determine the required compensating frequency of crystal oscillator, thus better compensate, adopt the method, to the precision of the real-time temperature sensor of the working temperature of monitoring crystal oscillator without too high demand, not only increase the accuracy of compensation, and reduce cost.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing the embodiment of the present invention is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the content of the embodiment of the present invention and these accompanying drawings.
Fig. 1 is the frequency compensated method flow diagram of the crystal oscillator that the embodiment of the present invention provides.
Fig. 2 is the operating time of the crystal oscillator that the embodiment of the present invention provides and the corresponding relation curve chart of frequency drift.
Fig. 3 is the method flow diagram of the temperature-compensating of the crystal oscillator that the embodiment of the present invention provides.
Embodiment
The technical problem solved for making the present invention, the technical scheme of employing and the technique effect that reaches are clearly, be described in further detail below in conjunction with the technical scheme of accompanying drawing to the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those skilled in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Please refer to Fig. 1, Fig. 1 is the method flow diagram of the crystal oscillator frequency compensation that the embodiment of the present invention provides.The method comprises:
S110, clock synchronous.
Clock synchronous, namely by GPS (Global Positioning System, global positioning system) or upper level clock to crystal oscillator standard signal, the control circuit of crystal oscillator is according to this standard signal, the output signal of crystal oscillator and this standard signal is made to carry out synchronously, this process is called the process of clock synchronous, or is called locking GPS or upper level clock.
S120, the operating temperature range of crystal oscillator is divided into multiple temperature range.
Between sync period, gather temperature change during crystal oscillator work, obtain the operating temperature range of crystal oscillator; The operating temperature range obtained is divided into multiple temperature range; Each temperature range includes a minimum temperature, a maximum temperature and a nominal temperature; Nominal temperature is the mean value of minimum temperature and maximum temperature, and the maximum temperature of each temperature range is identical with the difference of minimum temperature.
In the present embodiment, if the operating temperature range of crystal oscillator is-25 degrees Celsius to 75 degrees Celsius, the scope of-25 degrees Celsius to 75 degrees Celsius is divided into 100 intervals, then 1 degree Celsius is a temperature range.
Temperature range can be numbered, as :-25 degrees Celsius to-24 degrees Celsius is the first temperature range, and-24 degrees Celsius to-23 degrees Celsius is the second temperature range etc.
S130, set up the operating time of the crystal oscillator of each temperature range and the corresponding relation of frequency drift.
Between sync period, the frequency drift that Real-time Obtaining crystal oscillator is current, and by timer and temperature sensor real-time sampling crystal oscillator current operating time and working temperature, obtain the multiple operating time of crystal oscillator in each temperature range and the corresponding data of frequency drift, the corresponding data of the multiple operating time obtained and frequency drift is classified according to the temperature range belonging to working temperature, as: if the first temperature range-25 degrees Celsius to-24 degrees Celsius, the multiple operating time obtain working temperature when-25 degrees Celsius to-24 degrees Celsius intervals change and the corresponding data of frequency drift are labeled as the corresponding data of the first temperature range, in like manner, if the second temperature range-24 degrees Celsius to-23 degrees Celsius, the multiple operating time obtain working temperature when-24 degrees Celsius to-23 degrees Celsius intervals change and the corresponding data of frequency drift are labeled as the corresponding data of the second temperature range, the like, complete multiple operating time and the corresponding data of frequency drift and the correspondence markings of each temperature range.
According to multiple operating time of each temperature range and the corresponding data of frequency drift, set up the operating time of the crystal oscillator of each temperature range and the corresponding relation of frequency drift, be specially:
Respectively matching is carried out to multiple corresponding datas of each temperature range, obtain the operating time of the crystal oscillator of each temperature range and the corresponding relation of frequency drift.
Each temperature range operating time and the corresponding relation of frequency drift and the numbering one_to_one corresponding of each temperature range are got up, is stored in the memory of crystal oscillator.
Please refer to Fig. 2, Fig. 2 is the operating time of the crystal oscillator that the embodiment of the present invention provides and the corresponding relation curve chart of frequency drift.
Article two, the region between the second curve is a temperature range of setting, has multiple sampled point in this temperature range, the corresponding data that this sampled point is obtained operating time and frequency drift or sampled data.First curve is the matched curve generated after carrying out matching according to multiple sampled point of this temperature range or corresponding data, and this matched curve is the operating time of crystal oscillator and the corresponding relation curve of frequency drift.In the present embodiment, all corresponding matched curve of each temperature range divided in advance, each temperature range is equipped with a unique nominal temperature, i.e. all corresponding matched curve of each nominal temperature.Matched curve y1 as corresponding in the first temperature range, the corresponding matched curve y2 of the second temperature range, the corresponding matched curve yn of N temperature range etc.
S140, cancellation or do not carry out clock synchronous.
Enter the maintenance phase.The maintenance phase is the working hour that crystal oscillator loses GPS or upper level clock, when crystal oscillator works in this period, time during namely crystal oscillator works in maintenance, output signal no longer with GPS or upper level clock real-time synchronization.
The operating time that S150, Real-time Obtaining crystal oscillator are current and working temperature.
The operating time current by the equipment such as temperature sensor, timer Real-time Obtaining crystal oscillator and working temperature.
S160, determine the temperature range that current working temperature is corresponding.
Corresponding temperature range is determined according to current working temperature.
S170, obtain corresponding operating time and the corresponding relation of frequency drift according to the temperature range determined.
After determining temperature range, search from memory according to the numbering of temperature range and obtain corresponding operating time and the corresponding relation of frequency drift.
S180, determine the compensation of ageing frequency that provides needed for crystal oscillator.
According to the corresponding relation of current operating time and the operating time corresponding with temperature range obtained from memory and frequency drift, calculate the compensation of ageing frequency obtaining and provide needed for crystal oscillator.
S190, to obtain the current required compensating frequency of crystal oscillator according to the compensation of ageing frequency determined and temperature compensating frequency.
In the present embodiment, the operating time of the crystal oscillator of each temperature range and the corresponding relation of frequency drift is set up between sync period, the i.e. model of frequency aging, comparatively accurate and convenient, after during entering maintenance, first determine the temperature range belonging to working temperature, the temperature range belonging to working temperature obtains corresponding operating time and the corresponding relation of frequency drift, thus the compensation of ageing frequency of crystal oscillator can be determined, to distinguish the impact that working temperature is brought to frequency drift; And the relation of working temperature and frequency drift is generally known, and easily obtain, the temperature compensating frequency of crystal oscillator can be obtained thus, in conjunction with operating time and working temperature on the impact of frequency drift, and then the compensating frequency obtained needed for crystal oscillator, adopt the method, not only increase the accuracy of compensation, and reduce cost.
In addition, can also be obtained the temperature compensating frequency of crystal oscillator by the model of each frequency aging of setting up, please refer to Fig. 3, Fig. 3 is the method flow diagram of the temperature-compensating of the crystal oscillator that the embodiment of the present invention provides, and the method for this temperature-compensating comprises:
After step s 130, also step S131 is comprised.
S131, set up the working temperature of crystal oscillator and the corresponding relation of drift frequency.
Set up the working temperature of crystal oscillator and the corresponding relation of drift frequency according to the operating time of the crystal oscillator of each temperature range and the corresponding relation of frequency drift, be specially:
According to the operating time of the crystal oscillator of each temperature range and the corresponding relation of frequency drift, obtain the multiple nominal temperature of crystal oscillator under the identical operating time and the associated data of frequency drift.
According to multiple nominal temperature of acquisition and the associated data of frequency drift, set up the working temperature of crystal oscillator and the corresponding relation of frequency drift.
The change that the frequency of crystal oscillator produces along with the long-term passage of operating time, generally calculate with week, the moon or year, therefore, the shorter operating time can be ignored substantially on the impact of frequency drift.Under the selected identical operating time, two corresponding frequency drifts are obtained according to two nominal temperatures, the difference of two frequency drifts and the difference of two nominal temperatures are an associated data, for expressing the variable quantity of the frequency drift under different operating variations in temperature, after getting multiple associated data, the working temperature of crystal oscillator and the corresponding relation of frequency drift can be set up.This selected operating time should not arrange long, the error caused to prevent frequency aging.
Also step S181 is comprised after step S150.
S181, determine the temperature compensating frequency that provides needed for crystal oscillator.
The temperature compensating frequency provided needed for the corresponding relation determination crystal oscillator of the working temperature current according to crystal oscillator and the working temperature of crystal oscillator and frequency drift, enters step S190.
S190, to obtain the current required compensating frequency of crystal oscillator according to the compensation of ageing frequency determined and temperature compensating frequency.
Compensation of ageing frequency and temperature compensating frequency all can obtain according to the corresponding relation set up, and the compensating frequency needed for crystal oscillator is compensation of ageing frequency and temperature compensating frequency sum.
In the present embodiment, distinguish the impact that temperature is brought to frequency, set up the model of frequency aging, and then the corresponding relation of working temperature and frequency drift is set up according to the model of frequency aging, obtain temperature compensating frequency, therefore, during keeping, monitor the precision of the temperature sensor of the working temperature of crystal oscillator in real time without too high demand, not only increase the accuracy of compensation, and reduce cost.
In the present embodiment, the device of method that the crystal oscillator frequency realizing the present embodiment compensates comprises: the control circuit of crystal oscillator, temperature sensor, timer, GPS or upper level clock, micro-control unit etc., wherein, micro-control unit comprises memory, one or more than one processor and one or more than one program; Wherein, more than one or one program is stored in memory, and is configured by more than one or one processor execution, and more than one or one program package is containing the instruction for carrying out above step.
One of ordinary skill in the art will appreciate that all or part of step realizing above-described embodiment can have been come by hardware, the hardware that also can carry out instruction relevant by program completes, this program can be stored in a computer-readable recording medium, and storage medium can comprise memory, disk or CD etc.
Above content is only preferred embodiment of the present invention, and for those of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, this description should not be construed as limitation of the present invention.
Claims (7)
1. a method for crystal oscillator frequency compensation, is characterized in that, comprising:
The operating temperature range of crystal oscillator is divided into multiple temperature range;
Between sync period, set up the operating time of the crystal oscillator of each temperature range and the corresponding relation of frequency drift;
During maintenance, the operating time that Real-time Obtaining crystal oscillator is current and working temperature;
Determine the temperature range that current working temperature is corresponding;
Corresponding operating time and the corresponding relation of frequency drift is obtained according to the temperature range determined;
The compensation of ageing frequency provided needed for current operating time and the operating time of correspondence and the corresponding relation determination crystal oscillator of frequency drift.
2. method according to claim 1, is characterized in that, described step: between sync period, sets up the operating time of the crystal oscillator of each temperature range and the corresponding relation of frequency drift, specifically comprises:
Between sync period, sampling crystal oscillator, in each temperature range, frequency drift under the different operating time, obtains multiple operating time of each temperature range and the corresponding data of frequency drift;
According to multiple operating time of each temperature range and the corresponding data of frequency drift, set up the operating time of the crystal oscillator of each temperature range and the corresponding relation of frequency drift.
3. method according to claim 2, it is characterized in that, described step: according to multiple operating time of each temperature range and the corresponding data of frequency drift, set up the operating time of the crystal oscillator of each temperature range and the corresponding relation of frequency drift, specifically comprise:
Respectively matching is carried out to multiple corresponding datas of each temperature range, obtain the operating time of the crystal oscillator of each temperature range and the corresponding relation of frequency drift.
4. method according to claim 3, is characterized in that, described step: after setting up the operating time of the crystal oscillator of each temperature range and the corresponding relation of frequency drift, also comprise:
The working temperature of crystal oscillator and the corresponding relation of drift frequency is set up according to the operating time of the crystal oscillator of each temperature range and the corresponding relation of frequency drift.
5. method according to claim 4, is characterized in that, described step: set up the working temperature of crystal oscillator and the corresponding relation of drift frequency according to the operating time of the crystal oscillator of each temperature range and the corresponding relation of frequency drift, specifically comprise:
According to the operating time of the crystal oscillator of each temperature range and the corresponding relation of frequency drift, obtain the multiple nominal temperature of crystal oscillator under the identical operating time and the associated data of frequency drift;
According to multiple nominal temperature of acquisition and the associated data of frequency drift, set up the working temperature of crystal oscillator and the corresponding relation of frequency drift;
Wherein, each temperature range includes a minimum temperature, a maximum temperature and a nominal temperature; Nominal temperature is the mean value of minimum temperature and maximum temperature, and the maximum temperature of each temperature range is identical with the difference of minimum temperature.
6. method according to claim 5, is characterized in that, described step: after the compensation of ageing frequency provided needed for current operating time and the operating time of correspondence and the corresponding relation determination crystal oscillator of frequency drift, also comprise:
The temperature compensating frequency provided needed for the corresponding relation determination crystal oscillator of the working temperature current according to crystal oscillator and the working temperature of crystal oscillator and frequency drift.
7. method according to claim 6, it is characterized in that, described step: after the temperature compensating frequency provided needed for the corresponding relation determination crystal oscillator of the working temperature current according to crystal oscillator and the working temperature of crystal oscillator and frequency drift, also comprise: obtain the current required compensating frequency of crystal oscillator according to the compensation of ageing frequency determined and temperature compensating frequency.
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| CN106953597A (en) * | 2016-01-06 | 2017-07-14 | 精工爱普生株式会社 | Circuit arrangement, oscillator, electronic equipment and moving body |
| CN108227471A (en) * | 2016-12-21 | 2018-06-29 | 展讯通信（上海）有限公司 | GPS shares the calibration method and device of clock |
| CN108613753A (en) * | 2018-01-05 | 2018-10-02 | 京东方科技集团股份有限公司 | Thermometry and device, storage medium, the temperature measuring equipment method of inspection |
| CN110336557A (en) * | 2019-06-24 | 2019-10-15 | Oppo广东移动通信有限公司 | A kind of frequency compensation method, terminal and storage medium |
| CN110544875A (en) * | 2019-09-09 | 2019-12-06 | 衢州职业技术学院 | Optical modulation device and method of vertical cavity surface laser with grating |
| CN110750124A (en) * | 2019-09-24 | 2020-02-04 | 成都恒晶科技有限公司 | Adjustable and controllable analog temperature voltage compensation method |
| CN117353732A (en) * | 2023-11-08 | 2024-01-05 | 武汉非秒迅连科技有限公司 | Constant-temperature crystal oscillator temperature compensation method and device |
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| CN117353732A (en) * | 2023-11-08 | 2024-01-05 | 武汉非秒迅连科技有限公司 | Constant-temperature crystal oscillator temperature compensation method and device |
| CN117353732B (en) * | 2023-11-08 | 2024-04-16 | 武汉非秒迅连科技有限公司 | Constant-temperature crystal oscillator temperature compensation method and device |
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