CN1750399A - Method and device for correcting clock source ageing - Google Patents
Method and device for correcting clock source ageing Download PDFInfo
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- CN1750399A CN1750399A CN 200510117390 CN200510117390A CN1750399A CN 1750399 A CN1750399 A CN 1750399A CN 200510117390 CN200510117390 CN 200510117390 CN 200510117390 A CN200510117390 A CN 200510117390A CN 1750399 A CN1750399 A CN 1750399A
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Abstract
This invention relates to a method and a device for modifying frequency error caused by ageing of a clock source in the communication system. Said method includes: an information fetch step, a time comparison step and a frequency ageing compensation step, which is especially suitable for the UE in the mobile communication system or the base station system.
Description
Technical field
The invention belongs to a kind ofly, particularly in communication system, be used to revise, the compensating clock crystal is aging and cause the method and apparatus of frequency error clock ageing compensation of error technology in the calibration of existing automatic frequency.
Background technology
Clock unit is part and parcel in the communication system, for mobile communication terminal (UE) equipment, can be regarded as the heart of terminal, and it provides reference clock for whole terminal, and for radio frequency part, it provides the reference clock of frequency synthesizer; For baseband portion, it provides system clock for DSP and MCU and other digital units.Therefore, the performance of clock (as stability etc.) has significant effects to the performance of whole terminal.
What generally use in portable terminal (comprising mobile phone) at present is VC-TCXO (voltage-controlled compensation crystal oscillator), it is a kind of crystal oscillator by voltage (AFC) control output frequency, consider the factor of variations in temperature, so now a lot of VCXOs all have the temperature compensation function, as voltage-controlled temperature crystal oscillator, can regulate the frequency drift that causes because of variation of ambient temperature adaptively.
VC-TCXO has a lot of performance parameters, and these performance parameters have certain relevance.These parameters comprise: output frequency, output frequency are with respect to stability, output frequency control range and the ageing rate etc. of temperature, operating voltage and load.Wherein ageing rate is an important parameters among the VC-TCXO, a kind of compensates aging method because the present invention just is being based on to what the ageing rate of crystal oscillator proposed, for can clearer explanation the present invention, existing described ageing rate be done following introduction.
Under constant environmental condition, oscillator frequency and the Changing Pattern between the time are defined as ageing rate.This long-term frequency drift is that the slow variation by crystal element and pierce circuit element causes, and excessive drive level, various Johnson effect, circuit is aging etc.If the circuit design of crystal oscillator can guarantee that it works under lower operational environment and minimum drive level, will reduce the ageing rate index.The ageing rate here is a kind of long-term ageing rate index, and promptly the operating time is more than 1 year.
Ageing rate can be positive or negative numerical value.In general, the maximum when ageing rate of crystal is switched on use for the first time at it, to be higher than the ageing rate of time period thereafter initial several days that the use ageing rate indexs to several time-of-weeks, the first of ageing rate curve is known as " initial ageing rate " or " stable period ", under the fixed environment temperature, ageing rate curve and time relation are approximate can come match with logarithmic function, for an accurate crystal oscillator, can do effective estimation to this crystal oscillator ageing rate.
Be illustrated in figure 1 as ageing rate change curve in time, the solid horizontal line among Fig. 1 is the reference oscillation frequency of oscillator, and it is expressed as this oscillator in the desirable frequency of oscillation that waits without any wearing out under the situation about influencing.Bent solid line is after oscillator takes place to wear out, to produce under the situation of long-term frequency drift measured data.Shown in the dotted line result that long-term ageing rate (being bent solid line) data are carried out curve fitting.Longitudinal axis y represents the decrease of frequency, and unit is 1,000,000/(PPM:Parts Per Million), and formulate is as follows:
In the formula (1), f
0For at moment t
0First frequency of measuring, transverse axis is from t
0The elapsed time that constantly begins, f (k) be ageing rate at time t (k), k=1,2 ..., the sampling of n..
In the method for estimation of crystal ageing rate, often adopt the linear fit algorithm, logarithmic function prediction algorithm and Kalman filtering frequency predication algorithm.For VC-TCXO based on quartz oscillator, adopt the logarithmic function prediction algorithm to have good accuracy, simultaneously, the complexity of Logarithmic Algorithm also is an acceptable.
Adopt the logarithmic function prediction algorithm can be expressed as form:
y(t)＝Aln(Bt+1)+C， (2)
In formula (2), the matched curve of different coefficient A, B and C can be expressed as shown in Figure 2.
In formula (2), coefficient A, B and C can be according to the manufacturer data of VC-TCXO or user's actual measured results and match is come out.As seen, be effectively to estimate different time corresponding crystal ageing rate by above-mentioned formula.
In present mobile phone solution, what generally adopt is the discreteness that way that AFC (automatic frequency control) calibrates is eliminated the pressure-frequency characteristic of crystal oscillator, its method is to take a sample by the pressure-frequency characteristic to crystal oscillator, according to these sampling points the pressure-frequency characteristic of crystal is carried out data fitting and obtain pressure-frequency characteristic curve, terminal is exactly when proper communication according to resulting pressure-frequency characteristic curve frequency of amendment deviation of tabling look-up.These ways can be eliminated the discrete feature of VC-TCXO to a certain extent effectively.But this method is not considered the aging frequency drift that causes owing to VC-TCXO.If chosen at poor crystal oscillator aspect the ageing rate index in the middle of design, the frequency drift of being brought by ageing rate will be to taking the frequency correction of the resulting pressure of AFC calibration steps-when the frequency characteristic curve brings the proper communication of error effect mobile phone so.In fact, because the aging frequency drift that causes is relatively-stationary with respect to the time, and has good consistency.
Summary of the invention
In order to overcome the problems referred to above, the present invention proposes a kind of aging characteristics according to VC-TCXO (the time dependent characteristic of frequency drift), and the method that clock source ageing is revised.The frequency drift of aging characteristics that the present invention is based on VC-TCXO is with respect to the relative fixed of time and conforming characteristic and propose.Data and aging logarithm variation characteristic in time according to present VC-TCXO aging characteristics, can think that (chronomere is the sky at a time cycle value T, the value of T can carry out freely choosing according to the ageing rate index of crystal, according to the aging index rule of existing crystal, generally choose T=30*N, N gets natural number), owing to the aging frequency drift that causes of VC-TCXO is an acceptable.Therefore, can be worth T the time cycle for the compensation of VC-TCXO aging characteristics is least unit.
The method that clock source ageing is revised proposed by the invention mainly may further comprise the steps: the information read step, this step is used to read current time information and the time of making the product information of mobile phone and the data of compensation correction to be aging of mobile phone, for example is the aging data of revising of not doing after proofreading and correct through AFC; Current time information and time of making the product information that time comparison step, this step are used for the information read step is exported compare, and comparative result is exported; The data that the frequency compensation data that frequency aging compensation process, this step utilize the characteristic of clock source ageing to draw are treated the compensation of ageing correction are carried out compensation of ageing and the result are exported.
Wherein, described time comparison step asks difference to handle to the above-mentioned time earlier to current information of time with when the time of making the product, information compared, and the result to difference asks mould to handle again.
Wherein, described frequency compensation step can also comprise the determination frequency compensation process, and this step judges whether that according to the result who exports in the time comparison step and predefined compensation of ageing periodic quantity needs treat the data of compensation of ageing correction and carry out the compensation of ageing correction.
Wherein, described compensation of ageing periodic quantity is generally chosen T=30*N (T is the chronomere sky, and N gets natural number) according to the aging index rule of existing crystal, and the value of T can carry out freely choosing according to the ageing rate index of crystal.
Wherein, when described frequency aging compensation process carried out compensation of ageing to the frequency of input, the data that compensated were the result of calculation according to the logarithmic function prediction algorithm that adopts the crystal ageing rate.
Wherein, when described frequency aging compensation process carried out compensation of ageing to the frequency of input, the data that compensated can also be according to the linear fit algorithm that adopts the crystal ageing rate and the result of calculation of Kalman filtering frequency budget.
Wherein, when described frequency aging compensation process carries out compensation of ageing to the data of compensation correction to be aging of input, utilize the data in the ageing parameter table of preserving in advance of crystal aging characteristics, the aging of clock revised.
The present invention provide on the other hand a kind of can be according to the aging characteristics (the time dependent characteristic of frequency drift) of VC-TCXO, and the device that clock source ageing is revised.Wherein this device mainly comprises: information input unit, this information input unit is used to read current time information and the time of making the product information of mobile phone and the data of compensation correction to be aging of mobile phone, and the data of this compensation correction to be aging generally are the data after proofreading and correct through AFC; The time comparing unit; This unit is used for the current time information and the time of making the product information of information input unit output are compared, and comparative result is exported; The frequency aging compensating unit, this step is utilized the characteristic of clock source ageing, and the data of utilizing the frequency compensation data to treat the compensation of ageing correction are carried out compensation of ageing and the result are exported.
Wherein, described time comparing unit further comprises to be asked poor unit and asks form unit, describedly ask poor unit that current information of time and time of making the product information are asked the difference computing, and form unit is asked in result's input, the described form unit of asking is asked modular arithmetic to the result of the difference of input.
Wherein, described frequency compensation unit also comprises the determination frequency compensating unit, this determination frequency compensating unit judges whether that according to the result of time comparing unit output and predefined compensation of ageing periodic quantity the data of needs compensation of ageing correction carry out compensation of ageing, and determines whether to carry out the frequency aging compensation according to the result who is judged.
Wherein, the described compensation of ageing cycle is generally chosen T=30*N (T is the chronomere sky, and N gets natural number) according to the aging index rule of existing crystal, and the value of T can carry out freely choosing according to the ageing rate index of crystal.
Wherein, when described frequency aging compensating unit carried out compensation of ageing to the frequency of input, the data that compensated were the result of calculation according to the logarithmic function prediction algorithm that adopts the crystal ageing rate.
Wherein, when the frequency aging compensating unit carried out compensation of ageing to the frequency of input, the data that compensated were can also be according to the linear fit algorithm that adopts the crystal ageing rate and the result of calculation of Kalman filtering frequency budget.
Wherein, when described frequency aging compensating unit carries out compensation of ageing to the data of compensation correction to be aging of input, utilize the data in the crystal ageing parameter table of preserving in advance of crystal aging characteristics, the aging of clock revised.
By the method and apparatus of correcting clock source ageing of the present invention, overcome the shortcoming that can not realize the frequency drift brought for clock source ageing in the prior art, and realized compensation, thereby improved the performance of crystal effectively frequency shift (FS).
Description of drawings
Figure 1 shows that ageing rate change curve in time;
Figure 2 shows that the ageing rate time history plot of logarithmic function with different parameters;
Figure 3 shows that correcting clock source ageing schematic representation of apparatus of the present invention;
Figure 4 shows that the flow chart of a kind of correcting clock source ageing method of the present invention;
Figure 5 shows that the flow chart of another kind of correcting clock source ageing method of the present invention.
Embodiment
Can adopt a variety of specific implementation methods to the compensation of VC-TCXO aging characteristics, the following implementation method that provides two kinds to the compensation of VC-TCXO aging characteristics.
Be illustrated in figure 4 as the flow chart of a kind of correcting clock source ageing method of the present invention.Behind the mobile phone power-on, the information reading unit of correcting clock source ageing device shown in Figure 3 is carried out the information read step, read the factory data information of mobile phone, mobile phone sends the data after current time information and the process input process AFC correction, usually the mobile phone time of making the product is kept in the mobile phone memory, in Flash.The time of making the product of described mobile phone (T0) and current time (T1) information via L1C pass to the DSP part of mobile phone, if the base station sends current time information by broadcast to mobile phone here, T1 is exactly the current time that the base station sends so.A variable " AFC_Comp_Done " is set in Flash, and its initialization default value is " 0 ", and this default value is that the current data of " 0 " expression are not also through the ageing rate compensation, if after the compensation of process ageing rate, this default value can be changed into " 1 ".
Then, the comparing unit time of implementation time comparison step among Fig. 3 compared the time of making the product and current time of mobile phone.Concrete step is that difference operation is asked to the time of making the product and the current information of time of mobile phone in the poor unit of asking in this time comparing unit, i.e. (T1-T0) (unit: day), ask form unit to this difference T delivery then, the result is designated as Delta (T), that is: Delta (T)=[T1-T0] modeT.
Then, the determination frequency compensating unit in Fig. 3 medium frequency compensating unit judges whether that according to result and the predefined compensation of ageing periodic quantity of asking form unit output needs carry out compensation of ageing to the AFC value.Concrete Rule of judgment as shown in Figure 4, if Delta (T)=T-1, and variables A FC_Comp_Done=0, then decidable need be revised current AFC value, otherwise, need not revise current AFC value.Data and aging logarithm variation characteristic in time according to present VC-TCXO aging characteristics, the least unit of predefined compensation of ageing periodic quantity T is the sky, the value of T can carry out freely choosing according to the ageing rate index of crystal, according to the aging index rule of existing crystal, generally choose T=30*N, N gets natural number.
As shown in Figure 4, the result who judges when the determination frequency compensating unit is when the AFC value is revised, frequency compensation unit can according to the logarithmic function prediction algorithm in the method for estimation of crystal ageing rate as previously mentioned the result of calculation of formula (2) the AFC value is carried out the compensation of ageing correction.When correction is finished, the value of variables A FC_Comp_Done becomes 1, expresses these data and has carried out correction.
The aging correction of adopting this method to carry out has " Memorability ".In other words, the frequency aging of crystal oscillator compensation is had additive effect, the frequency compensation device need know whether in advance and carry out the overfrequency compensation.
It is to carry out according to the result to the logarithmic function prediction algorithm in the crystal ageing rate method of estimation that this method is carried out compensation of ageing to the AFC value, it also can adopt the result of other ageing rate methods of estimation to carry out the compensation of ageing correction, for example linear fit algorithm and Kalman filtering frequency predication algorithm or the like.
Need to prove in the frequency compensation unit in the present embodiment can not have the determination frequency compensating unit yet, according to the compensation cycle value of setting the AFC value of each input is all carried out the compensation of ageing correction.
Now another implementation method to the compensation of VC-TCXO aging characteristics of the present invention describes.Be illustrated in figure 5 as the flow chart of this method, only the part different with said method one done an explanation here, will no longer repeat for identical part.
This method and method one difference are that frequency compensation unit carries out the compensation of ageing correction to the AFC value and can transfer the calibration parameter table of AFC and the ageing parameter table of clock crystal, according to (T1-T0) calibration parameter of AFC are revised.This crystal ageing parameter is preserved in advance.Following table is the ageing rate parameter list of a typical clock crystal.
Need to prove that the sampling numerical value that the numerical value corresponding relation between this value T and the ageing rate can the actual measurement of reference crystal producer time cycle carries out the logarithmic function curve fit of formula (2) to these sampling numerical value, generates the ageing rate parameter list.
| T (my god) | Ageing rate (PPM) |
| 30 | 0.05 |
| 60 | 0.15 |
| 90 | 0.25 |
| … | … |
In this method, be in the each start of mobile phone, to realize, after the mobile phone power-on, the aging of clock revised the correction of clock source ageing.The aging correction of adopting this method to carry out is not have " Memorability ".
The foregoing description only is that what to be used for that the present invention will be described is not to be used for to limiting the present invention; for the person of ordinary skill of the art; after understanding the disclosed technology of the present invention, all be to belong to the scope that the present invention protects in the various changes that do not break away from outside the thought range of the present invention.
Claims (20)
1. the method for a correcting clock source ageing, this method be according to the aging characteristics of VC-TCXO, can be to the data of input because the frequency error that clock source ageing causes compensate and correct, and it comprises:
Information read step, this step are used to read current time information and the time of making the product information of mobile phone and the data of compensation correction to be aging of mobile phone;
Current time information and time of making the product information that time comparison step, this step are used for the information read step is exported compare, and comparative result is exported;
Frequency aging compensation process, this step utilize the characteristic of clock source ageing to carry out frequency compensation data that match draws and treat the data of compensation of ageing correction and carry out compensation of ageing and the result is exported.
2. the method for correcting clock source ageing as claimed in claim 1, the data of wherein said compensation correction to be aging are the data after proofreading and correct through AFC.
3. the method for correcting clock source ageing as claimed in claim 1 or 2, wherein said time comparison step is to current information of time with when the time of making the product, information compared, ask difference to handle to the above-mentioned time earlier, the result to difference asks mould to handle again.
4. the method for correcting clock source ageing as claimed in claim 1 or 2, wherein said frequency compensation step can also comprise the determination frequency compensation process, and this determination frequency compensation process judges whether that according to the result who exports in the time comparison step and predefined compensation of ageing periodic quantity needs treat compensation of ageing correction data and carry out compensation of ageing.
5. the method for correcting clock source ageing as claimed in claim 4, wherein said compensation of ageing periodic quantity can freely be chosen according to the ageing rate index of crystal.
6. the method for correcting clock source ageing as claimed in claim 4, wherein said compensation of ageing periodic quantity is generally chosen T=30*N according to the aging index rule of existing crystal, and T is the chronomere sky, and N gets natural number.
7. the method for correcting clock source ageing as claimed in claim 1 or 2, when wherein said frequency aging compensation process carried out compensation of ageing to the data of the compensation correction to be aging of input, the data that compensated were the result of calculation according to the logarithmic function prediction algorithm that adopts the crystal ageing rate.
8. the method for correcting clock source ageing as claimed in claim 1 or 2, when wherein the frequency aging compensation process carried out compensation of ageing to the data of the compensation correction to be aging of input, the data that compensated can also be according to the linear fit algorithm that adopts the crystal ageing rate and the result of calculation of Kalman filtering frequency budget.
9. the method for correcting clock source ageing as claimed in claim 1 or 2, when wherein said frequency aging compensation process carries out compensation of ageing to the data of the compensation correction to be aging of input, utilize the ageing parameter table of preserving in advance of crystal aging characteristics, the aging of clock source revised.
10. the method for correcting clock source ageing as claimed in claim 9, wherein said aging correction chart shows the numerical value corresponding relation between time cycle value and the ageing rate, described ageing rate is the sampling numerical value of reference crystal producer actual measurement, and these sampling numerical value are carried out the pre-measuring and calculating of logarithmic function and generate.
11. the correction that the device that clock source ageing is revised, this correcting device carry out according to the aging characteristics of VC-TCXO and to the data of input, wherein this device mainly comprises:
Information input unit, this information input unit are used to read current time information and the time of making the product information of mobile phone and the data of compensation correction to be aging of mobile phone;
Time comparing unit, this unit are used for the current time information and the time of making the product information of information input unit output are compared, and comparative result is exported;
The frequency aging compensating unit, this step is utilized the characteristic of clock source ageing, and the data of utilizing the frequency compensation data to treat the compensation of ageing correction are carried out compensation of ageing and the result are exported.
12. the method for correcting clock source ageing as claimed in claim 1, the data of wherein said compensation correction to be aging are the data after proofreading and correct through AFC.
13. as claim 11 or the 12 described devices that clock source ageing is revised, wherein said time comparing unit further comprises to be asked poor unit and asks form unit, describedly ask poor unit that current information of time and time of making the product information are asked the difference computing, and form unit is asked in result's input; The described form unit of asking is asked modular arithmetic to the result of difference of input.
14. as claim 11 or the 12 described devices that clock source ageing is revised, wherein said frequency compensation unit also comprises the determination frequency compensating unit, this determination frequency compensating unit judges whether that according to the result of time comparing unit output and predefined compensation of ageing periodic quantity the data of needs compensation of ageing correction carry out compensation of ageing, and determines whether to carry out the frequency aging compensation according to the result who is judged.
15. as claim 11 or the 12 described devices that clock source ageing is revised, wherein said compensation of ageing periodic quantity can carry out freely choosing according to the ageing rate index of crystal.
16. as claim 11 or the 12 described devices that clock source ageing is revised, wherein said compensation of ageing periodic quantity is chosen T=30*N according to the aging index rule of existing crystal, T is the chronomere sky, and N gets natural number.
17. as claim 11 or the 12 described devices that clock source ageing is revised, when wherein said frequency aging compensating unit carried out compensation of ageing to the data of the compensation correction to be aging of input, the data that compensated were the result of calculation according to the logarithmic function prediction algorithm that adopts the crystal ageing rate.
18. as claim 11 or the 12 described devices that clock source ageing is revised, when wherein the frequency aging compensating unit carried out compensation of ageing to the data of the compensation correction to be aging of input, the data that compensated can also be according to the linear fit algorithm that adopts the crystal ageing rate and the result of calculation of Kalman filtering frequency budget.
19. the method for correcting clock source ageing as claimed in claim 1 or 2, when wherein the frequency aging compensating unit carries out compensation of ageing to the data of the compensation correction to be aging of input, utilize the ageing parameter table of preserving in advance of crystal aging characteristics, the aging of clock source revised.
20. the method for correcting clock source ageing as claimed in claim 19, wherein said aging correction chart shows the numerical value corresponding relation between time cycle value and the ageing rate, described ageing rate is the sampling numerical value of reference crystal producer actual measurement, and these sampling numerical value are carried out the pre-measuring and calculating of logarithmic function and generate.
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| WO2007143936A1 (en) * | 2006-06-12 | 2007-12-21 | Huawei Technologies Co., Ltd. | System, device and method for implementing rubidium clock aging compensation |
| CN1870479B (en) * | 2006-06-12 | 2010-08-04 | 华为技术有限公司 | System and method for implementing rubidium clock aging compensation |
| CN101573870B (en) * | 2006-12-26 | 2011-12-21 | 松下电器产业株式会社 | PLL burn-in circuit and semiconductor integrated circuit |
| CN101645718B (en) * | 2008-08-07 | 2013-08-07 | 中兴通讯股份有限公司 | Method and device for holding clock |
| CN103501178B (en) * | 2013-09-27 | 2017-05-24 | 中国电子科技集团公司第四十一研究所 | High-stability time base oscillator automatic calibration circuit and method |
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| CN105722210A (en) * | 2016-03-02 | 2016-06-29 | 广东欧珀移动通信有限公司 | Crystal oscillator static frequency error calibration method and system |
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| CN106851818A (en) * | 2017-03-30 | 2017-06-13 | 博威通讯系统(深圳)有限公司 | The calibration method of micro-base station frequency deviation |
| CN106851818B (en) * | 2017-03-30 | 2020-05-19 | 博威通讯系统(深圳)有限公司 | Method for calibrating frequency offset of micro base station |
| CN107566105A (en) * | 2017-08-07 | 2018-01-09 | 南方电网科学研究院有限责任公司 | Time synchronism equipment compensation method, device, storage medium and its computer equipment |
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