CN105763159A - Method and device for adjusting frequency offset of mobile terminal - Google Patents
Method and device for adjusting frequency offset of mobile terminal Download PDFInfo
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- CN105763159A CN105763159A CN201410791003.1A CN201410791003A CN105763159A CN 105763159 A CN105763159 A CN 105763159A CN 201410791003 A CN201410791003 A CN 201410791003A CN 105763159 A CN105763159 A CN 105763159A
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Abstract
The present invention provides a method and a device for adjusting the frequency offset of a mobile terminal. The device for adjusting the frequency offset of the mobile terminal comprises a control unit, an oscillation circuit, a clock module, a temperature detecting device and a crystal. The temperature of the crystal is obtained twice by means of the temperature detecting device, and the frequency offset of the crystal is simultaneously measured. The relationship between the temperature of the crystal and the frequency offset is determined. During the usage of the mobile terminal, the temperature of the crystal is read in real time. Based on the relationship between the temperature of the crystal and the frequency offset, the frequency offset of the mobile terminal during usage is determined. Furthermore, based on the relationship between the frequency offset of the crystal and a control code word, the frequency offset of the crystal is adjusted to be minimum through adjusting the corresponding control code word. Therefore, the frequency offset of the crystal is compensated. Meanwhile, after the mobile terminal is powered on, the temperature compensation of the frequency offset is conducted. Therefore, the compensation is obtained at one time and is independent of both the system and the frequency offset. In this way, the compensation is simple.
Description
Technical field
The present invention relates to moving communicating field, especially one mobile terminal frequency offset regulation method and device.
Background technology
Clock reference circuit conventional in the mobile terminal of communication system has TCXO (TemperatureCompensateX ' tal (crystal) Oscillator, Temp .-compensation type crystal oscillator) and DCXO (DigitalCompensateX ' tal (crystal) Oscillator, digit compensated crystal oscillator).The base when basic circuit of TCXO and DCXO all comprises oscillating circuit with reference.Oscillating circuit is made up of LC agitator, and during reference, base is generally adopted quartz crystal (crystal).The LC agitator of composition oscillating circuit is generally adopted variable capacitance (or capacitor array), by control unit or analog-digital converter (DAC), variable capacitance (or capacitor array) is adjusted, thus realizing adjusting the purpose of TCXO and DCXO output frequency.
Fig. 1 illustrates the circuit diagram of TCXO module in prior art.For TCXO module, except oscillating circuit 101 with quartz crystal 102, temperature compensation module 103 and linear compensation module 104 also it is integrated with inside it, making its frequency variation and control unit 105 (or analog-digital converter) adjustment amount be more satisfactory linear relationship, and therefore the method for its frequency adjustment is fairly simple.But the shortcoming of TCXO is, first price is of a relatively high；Secondly, when using TCXO, in the radio frequency master chip of some terminal system, oscillating circuit is still in work, wastes power consumption；Using TCXO, some system needs extra analog-digital converter, increases cost；Also some radio frequency master chip itself is provided that analog-digital converter, but is also necessary for analog-digital converter output and increases extra package pins, and one master chip of mobile terminal usually contains multiple pattern or frequency range at present, and pin resource is more limited.
Fig. 2 illustrates the circuit diagram of DCXO module in prior art.For most terminal systems, DCXO module distribution is in two devices, and oscillating circuit 201 is normally contained in the master chip of transceiver, and quartz crystal 202 is be placed in the independent component outside master chip 200.Owing to the oscillating circuit 201 of DCXO is included in master chip, therefore only need to select many quartz crystals that a price is lower than TCXO outside master chip, coordinate corresponding adjustment algorithm normally to use.
Application number be 201210585936.6 patent of invention " mobile terminal frequency regulation method and device " provide and a kind of need not realize the accurate method adjusted when temperature-compensation circuit and linearizer, however it is necessary that very complicated net algorithm of searching is as support, also can affect searching net spee and searching net success rate of mobile terminal simultaneously.
Summary of the invention
It is an object of the invention to provide a kind of mobile terminal frequency offset regulation method and device, need complexity to search net algorithm and affect the problem searching net spee He search net success rate solving mobile terminal frequency deviation adjustment
In order to achieve the above object, the present invention also provides for a kind of mobile terminal frequency offset regulation method, and this mobile terminal uses digit compensated crystal oscillator, comprises the following steps:
Under reference temperature, it is determined that the relation between frequency deviation and the control code word of crystal；
Under described reference temperature, control code word during without frequency deviation is designated as unbiased code；
When control code word is described unbiased code, obtain the different twice measurement temperature of mobile terminal and frequency deviation corresponding with described measurement temperature respectively, so that it is determined that the relation between frequency deviation and measurement temperature；
When mobile terminal uses, read the real time temperature of mobile terminal, determine frequency deviation value according to the relation between temperature and frequency deviation；
According to the relation between frequency deviation and control code word, adjust control code word and frequency deviation is adjusted minimum, complete the compensation to frequency deviation.
Preferably, in above-mentioned mobile terminal frequency offset regulation method, in above-mentioned steps S3, the step of the different twice measurement temperature and frequency deviation corresponding with described measurement temperature that obtain mobile terminal respectively includes:
Make described mobile terminal launch with minimum power minimum time fragment, read described crystal the first temperature now, measure described crystal the first frequency deviation now simultaneously；
Make described mobile terminal launch with peak power maximum time fragment, read described crystal the second temperature now, test described crystal the second frequency deviation now simultaneously.
Preferably, in above-mentioned mobile terminal frequency offset regulation method, the relation between temperature and the frequency deviation of crystal is as follows:
F (t)=c3(t-t0)3+c2(t-t0)2+c1(t-t0)+c0；
Wherein, f (t) represents that frequency deviation, t represent temperature, t0Represent reference temperature value, c0、c1、c2、c3Intrinsic parameter for crystal.
Preferably, in above-mentioned mobile terminal frequency offset regulation method, described reference temperature value t0It it is 25 DEG C.
Preferably, in above-mentioned mobile terminal frequency offset regulation method, when temperature is between-20 DEG C～70 DEG C, c2、c3On the impact of frequency deviation within +/-1ppm, obtained by producer or test acquisition.
Preferably, in above-mentioned mobile terminal frequency offset regulation method, the variations in temperature between described first temperature and described second temperature is more than 1 DEG C.
Present invention also offers a kind of mobile terminal frequency deviation adjusting apparatus, including: control unit, oscillating circuit, clock module, temperature-detecting device and crystal；
Described control unit, described oscillating circuit, described clock module are positioned on master chip, and described crystal is positioned at outside described master chip；
Described oscillating circuit is controlled by described control unit, and the output frequency of described crystal is input to described clock module by described oscillating circuit；
Described temperature-detecting device is for measuring the temperature of described crystal.
Preferably, in above-mentioned mobile terminal frequency deviation adjusting apparatus, described temperature-detecting device includes the analog-digital converter being arranged on master chip and the thermo-sensitive resistor being connected with described analog-digital converter, and described thermo-sensitive resistor is for detecting the temperature of described crystal.
Preferably, in above-mentioned mobile terminal frequency deviation adjusting apparatus, described thermo-sensitive resistor and described crystal integrate.
Preferably, in above-mentioned mobile terminal frequency deviation adjusting apparatus, described thermo-sensitive resistor is independent of described crystal.
In mobile terminal frequency offset regulation method provided by the invention and device, pass twice through temperature-detecting device and obtain the temperature of crystal, measure the frequency deviation of described crystal simultaneously, determine the relation between the temperature of crystal and frequency deviation, mobile terminal is in use, read the temperature of described crystal in real time, utilize the relation between the temperature of crystal and frequency deviation, may thereby determine that mobile terminal frequency deviation in use, further with the relation between frequency deviation and the control code word of crystal, by adjusting the corresponding code word that controls, the frequency deviation of crystal is adjusted minimum, thus realizing the compensation to crystal frequency deviation.And after described mobile terminal-opening, frequency deviation is carried out temperature-compensating, and make the disposable acquisition of compensation, unrelated with standard and frequency deviation, compensate simple
Accompanying drawing explanation
Fig. 1 is the circuit diagram of TCXO module in prior art；
Fig. 2 is the circuit diagram of DCXO module in prior art；
Fig. 3 is the flow chart of DCXO temperature compensation in the embodiment of the present invention；
Fig. 4 is the circuit diagram of DCXO temperature compensation means in the embodiment of the present invention；
In figure: 101-oscillating circuit；102 crystal；103-temperature compensation module；104-linear compensation module；105-control unit；
200-master chip；201-oscillating circuit；202-crystal；
301-master chip；302-oscillating circuit；303-crystal；304-temperature measuring equipment；305-control unit；306-clock module；307-thermo-sensitive resistor；308-analog-digital converter.
Detailed description of the invention
Below in conjunction with schematic diagram, the specific embodiment of the present invention is described in more detail.According to description below and claims, advantages and features of the invention will be apparent from.It should be noted that, accompanying drawing all adopts the form simplified very much and all uses non-ratio accurately, only in order to convenience, the purpose aiding in illustrating the embodiment of the present invention lucidly.
As shown in Figure 4, the invention provides a kind of mobile terminal frequency deviation adjusting apparatus, including: control unit 305, oscillating circuit 302, clock module 306, temperature-detecting device 304 and crystal 303；
Described control unit 305, described oscillating circuit 302, described clock module 306 are positioned on master chip 301, and described crystal 303 is positioned at outside affiliated master chip 301；
Described oscillating circuit 302 is controlled by described control unit 305, and the output frequency of described crystal 303 is input to described clock module (CLKIN) 306 by described oscillating circuit 302；
Described temperature-detecting device 304 is for measuring the temperature of described crystal 303.
Concrete, described temperature-detecting device 304 includes the analog-digital converter 308 being arranged on master chip 301 and the thermo-sensitive resistor 307 being connected with described analog-digital converter 308, and described thermo-sensitive resistor 307 is for detecting the temperature of described crystal 303.Described thermo-sensitive resistor 307 can integrate with described crystal 303, it is also possible to independent of described crystal 303, is only connected with the analog-digital converter 308 on described master chip 301.
Owing to existing mobile terminal or other communication systems generally have temperature-detecting device 304, the present invention can by existing temperature-detecting device 304, only the placement location of existing thermo-sensitive resistor 307 need to be adjusted, namely can be used to move terminal frequency offset adjustment, without still further arranging thermo-sensitive resistor, reduce further cost.
As it is shown on figure 3, present invention also offers a kind of corresponding mobile terminal frequency offset regulation method, this mobile terminal uses digit compensated crystal oscillator (DCXO), comprises the following steps:
Step S1: under reference temperature, it is determined that the relation between frequency deviation and the control code word of crystal.Concrete, the frequency deviation of described crystal is except temperature influence, the rate-adaptive pacemaker of described crystal can also be adjusted by adjusting the load capacitance that is connected with described crystal, the rate-adaptive pacemaker of described crystal can be adjusted by adjusting the variable capacitance of oscillating circuit 302 in described master chip 301.Variable capacitance in oscillating circuit 302 is adjusted typically via digital control code (representing with AFC), and preferably, in linear function relation between described variable capacitance and AFC, namely the frequency deviation of described crystal and AFC are linear function relation.
Concrete, owing to frequency deviation and the control code word AFC of described crystal are linear function relation, therefore control code word AFC can repeatedly be adjusted, then the frequency deviation of described crystal is measured, with this frequency deviation determining described crystal and the linear relationship controlled between code word AFC, say, that adjust at twice and control code word AFC, measure the frequency deviation of crystal described in twice simultaneously respectively, utilize above-mentioned two groups of data namely to can determine that linear function relation definite between frequency deviation and the AFC of described crystal.
In other embodiments of the invention, relation between frequency deviation and the described control code word AFC of described crystal is likely nonlinear, segmentation AFC strategy can be passed through, that is the relation curve between the frequency deviation of described crystal and described control code word AFC is divided into multistage, on each section, the frequency deviation of described crystal is linear function relation with control code word AFC, still can adopt and carry out the frequency deviation that described crystal is determined in segmentation and the linear relationship controlled between code word AFC with the aforedescribed process.
Step S2: under reference temperature, is designated as unbiased code AFC0 by control code word during without frequency deviation.Control code word AFC by adjusting, obtain unbiased code AFC0, a described AFC0 and the output frequency of mobile terminal is mated with the frequency of base station, be 26MHz.
Further, there is following relation between temperature and the frequency deviation of described crystal:
F (t)=c3(t-t0)3+c2(t-t0)2+c1(t-t0)+c0Formula (1)
Wherein, f (t) represents that frequency deviation, t represent temperature, t0Represent reference temperature value, c0、c1、c2、c3Intrinsic parameter for crystal.
The supplier of described crystal, when providing crystal, can provide each item data of described crystal, including c simultaneously0、c1、c2、c3.When temperature is between-20 DEG C～70 DEG C, c2、c3On the impact of frequency deviation within +/-1ppm, and c0、c1On the impact of frequency deviation within +/-10ppm, say, that at identical conditions, c0、c1The impact of frequency deviation is far longer than c2、c3Impact on frequency deviation, therefore c0、c1Degree of accuracy the impact of frequency deviation is bigger, in actual production process, it is necessary to c0、c1It is calibrated.And then relation more accurately can be obtained between temperature and the frequency deviation of described crystal.
Step S3: when control code word is described unbiased code AFC0, obtain the different twice measurement temperature of described mobile terminal and frequency deviation corresponding with described measurement temperature respectively, so that it is determined that the relation between frequency deviation and measurement temperature.
Concrete, step S31: control code word is fixed as above-mentioned unbiased code AFC0, make described mobile terminal launch with minimum power minimum time fragment, read described crystal the first temperature now, measure described crystal the first frequency deviation now simultaneously.
Step S32: make described mobile terminal launch with peak power maximum time fragment, reads described crystal the second temperature now, tests described crystal the second frequency deviation now simultaneously.
Respectively the second temperature obtained in the first temperature obtained in described step S31 and the first frequency deviation, step S32 and the second frequency deviation are brought in above-mentioned formula (1), such that it is able to obtain about c0、c1Two equations, it is hereby achieved that calibration after c0、c1Value, then by the c after calibration0、c1It is brought in formula (1), relation more accurately can be obtained between temperature and the frequency deviation of described crystal.
Variations in temperature between described first temperature and described second temperature is more than 1 DEG C.That is, after making described mobile terminal launch with minimum power minimum time fragment, after described temperature-detecting device 304 detects that the variations in temperature of described crystal 303 is more than 1 DEG C, then make affiliated mobile terminal launch with peak power maximum time fragment, carry out second time and measure.Described variations in temperature, more than 1 DEG C, is the degree of accuracy in order to improve test, if described variations in temperature is too little, influences whether testing precision.More excellent, described variations in temperature is less than 2 DEG C.It is the process time in order to reduce software less than 2 DEG C, improves efficiency.In the process of measurement, the temperature of described mobile terminal not can exceed that 40 DEG C, it is prevented that temperature too high increasing c2、c3Impact on frequency deviation.
And twice measurement is launched with minimum power minimum time fragment and peak power maximum time fragment respectively, to guarantee that described crystal 303 temperature difference in the short period of time can reach above-mentioned requirements, the temperature difference of described crystal 303 is namely made to reach more than 1 DEG C the requirement less than 2 DEG C as early as possible.
Step S4: when mobile terminal uses, reads the real time temperature of mobile terminal, determines frequency deviation value according to the relation between temperature and frequency deviation.
Described mobile terminal is in use, described master chip 301 can be initialized after start, when described master chip 301 initializes, the real time temperature of described crystal 303 is read by described temperature-detecting device 304, calculate the frequency deviation of described crystal according to above-mentioned formula (1), now corresponding control code word is AFC0.
Step S5: according to the relation between frequency deviation and control code word, adjusts control code word and frequency deviation is adjusted minimum, complete the compensation to frequency deviation.
After above-mentioned steps S4 determines the real-time frequency deviation of described crystal, the relation between frequency deviation and control code word AFC according to the described crystal determined in described step S1, adjust and control code word AFC, the frequency deviation of described crystal is adjusted minimum, completes the adjustment to described crystal frequency deviation.Finally the crystal output frequency after carrying out temperature-compensating is input in described clock module 306.
In above-mentioned steps, described reference temperature value t0It it is 25 DEG C.The supplier of described crystal, when providing the relevant parameter of described crystal, can provide the acquisition temperature conditions of relevant parameter simultaneously, also be 25 DEG C.
To sum up, in the mobile terminal frequency offset regulation method and device of embodiment of the present invention offer, pass twice through temperature-detecting device and obtain the temperature of crystal, measure the frequency deviation of described crystal simultaneously, determine the relation between the temperature of crystal and frequency deviation, mobile terminal is in use, read the temperature of described crystal in real time, utilize the relation between the temperature of crystal and frequency deviation, may thereby determine that mobile terminal frequency deviation in use, further with the relation between frequency deviation and the control code word of crystal, by adjusting the corresponding code word that controls, the frequency deviation of crystal is adjusted minimum, thus realizing the compensation to crystal frequency deviation.And after described mobile terminal-opening, frequency deviation is carried out temperature-compensating, and make the disposable acquisition of compensation, unrelated with standard and frequency deviation, compensate simple
Above are only the preferred embodiments of the present invention, the present invention is not played any restriction effect.Any person of ordinary skill in the field; without departing from the scope of technical scheme; the technical scheme that the invention discloses and technology contents are made the variations such as any type of equivalent replacement or amendment; all belong to the content without departing from technical scheme, still fall within protection scope of the present invention.
Claims (10)
1. a mobile terminal frequency offset regulation method, this mobile terminal uses digit compensated crystal oscillator, it is characterised in that comprise the following steps:
Under reference temperature, it is determined that the relation between frequency deviation and the control code word of crystal；
Under described reference temperature, control code word during without frequency deviation is designated as unbiased code；
When control code word is described unbiased code, obtain the different twice measurement temperature of mobile terminal and frequency deviation corresponding with described measurement temperature respectively, so that it is determined that the relation between frequency deviation and measurement temperature；
When mobile terminal uses, read the real time temperature of mobile terminal, determine frequency deviation value according to the relation between temperature and frequency deviation；
According to the relation between frequency deviation and control code word, adjust control code word and frequency deviation is adjusted minimum, complete the compensation to frequency deviation.
2. mobile terminal frequency offset regulation method as claimed in claim 1, it is characterised in that the step of the different twice measurement temperature and frequency deviation corresponding with described measurement temperature that obtain mobile terminal respectively includes:
Make described mobile terminal launch with minimum power minimum time fragment, read described crystal the first temperature now, measure described crystal the first frequency deviation now simultaneously；
Make described mobile terminal launch with peak power maximum time fragment, read described crystal the second temperature now, test described crystal the second frequency deviation now simultaneously.
3. mobile terminal frequency offset regulation method as claimed in claim 2, it is characterised in that the relation between temperature and the frequency deviation of described crystal is as follows:
F (t)=c3(t-t0)3+c2(t-t0)2+c1(t-t0)+c0,
Wherein, f (t) represents that frequency deviation, t represent temperature, t0Represent reference temperature value, c0、c1、c2、c3Intrinsic parameter for crystal.
4. mobile terminal frequency offset regulation method as claimed in claim 3, it is characterised in that described reference temperature value t0It it is 25 DEG C.
5. mobile terminal frequency offset regulation method as claimed in claim 3, it is characterised in that when temperature is between-20 DEG C～70 DEG C, c2、c3On the impact of frequency deviation within +/-1ppm, obtained by producer or test acquisition.
6. mobile terminal frequency offset regulation method as claimed in claim 2, it is characterised in that the variations in temperature between described first temperature and described second temperature more than 1 DEG C between.
7. one kind uses the mobile terminal frequency deviation adjusting apparatus of any one method in claim 1-6, it is characterised in that including: control unit, oscillating circuit, clock module, temperature-detecting device and crystal；
Described control unit, described oscillating circuit, described clock module are positioned on a master chip, and described crystal is positioned at outside described master chip；
Described oscillating circuit is controlled by described control unit, and the output frequency of described crystal is input to described clock module by described oscillating circuit；
Described temperature-detecting device is for measuring the temperature of described crystal.
8. mobile terminal frequency deviation adjusting apparatus as claimed in claim 7, it is characterized in that, described temperature-detecting device includes the analog-digital converter being arranged on master chip and the thermo-sensitive resistor being connected with described analog-digital converter, and described thermo-sensitive resistor is for detecting the temperature of described crystal.
9. mobile terminal frequency deviation adjusting apparatus as claimed in claim 8, it is characterised in that described thermo-sensitive resistor and described crystal integrate.
10. mobile terminal frequency deviation adjusting apparatus as claimed in claim 8, it is characterised in that described thermo-sensitive resistor is independent of described crystal.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106788556A (en) * | 2016-11-07 | 2017-05-31 | 努比亚技术有限公司 | A kind of method and device, the terminal of frequency regulation |
| CN108540417A (en) * | 2018-04-08 | 2018-09-14 | 深圳市盛路物联通讯技术有限公司 | A kind of method of Automatic Frequency Control, system and automatic frequency controller |
| CN109039574A (en) * | 2018-08-21 | 2018-12-18 | 维沃移动通信有限公司 | A kind of method and its terminal device reducing frequency deviation |
| CN110855590A (en) * | 2019-11-18 | 2020-02-28 | 紫光展锐(重庆)科技有限公司 | Frequency offset compensation method, system, electronic device and computer readable storage medium |
| CN111007710A (en) * | 2019-12-26 | 2020-04-14 | 展讯通信（上海）有限公司 | Production line calibration method, device and system of equipment clock, self-calibration method and equipment |
| CN111045317A (en) * | 2019-12-26 | 2020-04-21 | 展讯通信（上海）有限公司 | Calibration method, device and system of equipment clock, self-calibration method and equipment |
| CN111045475A (en) * | 2019-12-30 | 2020-04-21 | 上海立可芯半导体科技有限公司 | Frequency offset adjusting system and method |
| CN111045318A (en) * | 2019-12-26 | 2020-04-21 | 展讯通信（上海）有限公司 | Calibration method, device and system of equipment clock, self-calibration method and equipment |
| CN111162753A (en) * | 2020-01-07 | 2020-05-15 | Oppo广东移动通信有限公司 | Crystal oscillation device, radio frequency module and electronic equipment |
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| CN111045317B (en) * | 2019-12-26 | 2022-02-25 | 展讯通信（上海）有限公司 | Calibration method, device and system of equipment clock, self-calibration method and equipment |
| CN111045475A (en) * | 2019-12-30 | 2020-04-21 | 上海立可芯半导体科技有限公司 | Frequency offset adjusting system and method |
| CN111162753A (en) * | 2020-01-07 | 2020-05-15 | Oppo广东移动通信有限公司 | Crystal oscillation device, radio frequency module and electronic equipment |
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