CN101399794B - Reference clock generating method and device for supporting multi-transceiving system - Google Patents
Reference clock generating method and device for supporting multi-transceiving system Download PDFInfo
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Abstract
A generation method for a reference clock of a multi-transceiver supporting system is used for the generation of a reference clock in a multi-transceiver system and the frequency offset control of each simultaneous working transceiver system; the method comprises the following steps: an adjusting frequency offset is obtained from the obtained initial frequency offset of each transceiver system according to a set mapping relationship; a reference clock which is arranged in the transceiver system and used by each transceiver system is adjusted according to the adjusting frequency offset, when the output frequency of the reference clock is kept unchanged; by taking the output frequency of the reference clock as the standard value, the frequency division parameter within the permission of the phase-locked loop frequency offset of each transceiver system is calculated, the frequency is locked and the frequency offset is controlled according to the frequency division parameter. The invention also discloses a generation device for the reference clock of the multi-transceiver supporting system. The invention reduces the production cost of the multi-transceiver system, can reduce the production size of the multi-transceiver system terminal equipment and improve the system stability of the multi-transceiver system terminal equipment.
Description
Technical field
The present invention relates to a kind of communication technology, especially support the reference clock generating method of multi-transceiving system and support that the reference clock generation device of multi-transceiving system is relevant with a kind of
Background technology
Along with the development of terminal technology, the function of mobile phone terminal from strength to strength, increasing functional requirement and mobile phone communication can carry out simultaneously.(comprise China Mobile multimedia broadcasting (ChinaMobile Multimedia Broadcasting like mobile TV; Be called for short CMMB) or Single Frequency Network multimedia broadcast multicast services (Single Frequency Network Multimedia Broadcast Multicast Service is called for short SFN-MBMS)).Mobile TV requires mobile phone terminal when supporting mobile phone TV services, does not influence other basic telecom services such as normal talk business.Therefore, require mobile phone terminal can support two to overlap even overlap professional receive-transmit system more and carry out transmitting-receiving work simultaneously.
In the terminal that two traditional cover systems are worked simultaneously,, need through phase-locked loop (Phase-lock loop is called for short PLL) two cover systems to be carried out frequency locking and frequency deviation control respectively because the system reference source of two cover receive-transmit systems is different.In order to reach the purpose that two cover receive-transmit systems are worked simultaneously and satisfied the frequency deviation requirement, generally need two cover reference clocks, two cover receive-transmit systems of operation are simultaneously provided the reference frequency of reference clock respectively.For this many reference clocks system, its limitation and shortcoming are:
Two covers or the existence of overlapping reference clock will inevitably increase the terminal equipment cost more, strengthen its printed circuit board (PCB) area of (Printed circuit board is called for short PCB), and then terminal volume is increased, and are not easy to the use of user to this terminal.This certainly will run in the opposite direction with the commercialization development trend at the terminal that comprises mobile phone.
Owing to two covers are arranged or overlap reference clock more and exist simultaneously, probably cause between two or more receive-transmit systems to interact, thereby influence the stability of systematic function; And stable for the maintenance system performance then can cause hardware designs complicated.
Summary of the invention
To the problem that exists in the prior art; The object of the present invention is to provide a kind of reference clock generating method of supporting multi-transceiving system; With the production cost of further reduction multi-transceiving system and the production size that reduces the multi-transceiving system terminal equipment, improve the stability of a system of multi-transceiving system terminal equipment.
The reference clock generation device of the support multi-transceiving system of the reference clock generating method that second purpose of the present invention is to provide a kind of the present invention of realization to support multi-transceiving system.
For realizing above-mentioned purpose, technical scheme of the present invention is following:
A kind of reference clock generating method of supporting multi-transceiving system, the reference clock that is used for multi-transceiving system produces with the frequency deviation of each receive-transmit system of working simultaneously to be controlled, and comprising:
Step S1:, obtain an adjustment frequency deviation according to the mapping relations of setting with the initial frequency deviation of said each receive-transmit system that is obtained;
Step S2: adjust the shared reference clock of said each receive-transmit system that is provided with in the said receive-transmit system according to said adjustment frequency deviation, keep the output frequency of said reference clock constant;
Step S3: the output frequency with said reference clock is as the criterion, and calculates that the frequency deviation of said each receive-transmit system phase-locked loop allows interior frequency division parameter, and carries out frequency locking and frequency deviation control according to said frequency division parameter.
The reference clock generating method of support multi-transceiving system of the present invention; Preferably; Said multi-transceiving system comprises that initial frequency deviation is first receive-transmit system of first frequency deviation and second receive-transmit system that initial frequency deviation is second frequency deviation, and said mapping is the said adjustment frequency deviation of picked at random between said first frequency deviation and said second frequency deviation.
The reference clock generating method of support multi-transceiving system of the present invention, preferred, said mapping is that to get the mean value of first frequency deviation and second frequency deviation be said adjustment frequency deviation.
The reference clock generating method of support multi-transceiving system of the present invention, preferred, through integral frequency divisioil formula or the said frequency division parameter of fractional frequency division formula to calculating.
The reference clock generating method of support multi-transceiving system of the present invention, preferred, said multi-transceiving system comprises that initial frequency deviation is first receive-transmit system of first frequency deviation, said mapping is that to get said first frequency deviation be said adjustment frequency deviation.
The reference clock generating method of support multi-transceiving system of the present invention, preferred, said reference clock is TCXO.
A kind of the present invention of realization supports the reference clock generation device of support multi-transceiving system of the reference clock generating method of multi-transceiving system; The generation that is used for the reference clock of multi-transceiving system is controlled with the frequency deviation of each receive-transmit system of working simultaneously, comprises mapping block, reference clock adjusting module and calculates module;
Said mapping block with the initial frequency deviation of said each receive-transmit system that is obtained, obtains an adjustment frequency deviation according to the mapping relations of setting;
Said reference clock adjusting module comprises the reference clock that each receive-transmit system is shared, according to the said adjustment frequency deviation that said mapping block transmits, adjusts said reference clock and keeps the output frequency of said reference clock constant;
Said reckoning module is as the criterion with the output frequency of said reference clock, extrapolates the frequency division parameter in frequency deviation allows of each said receive-transmit system phase-locked loop, exports said frequency division parameter.
Reference clock generation device of the present invention, preferred, said mapping block comprises input unit, map unit and output unit;
Said input unit receives first frequency deviation of first receive-transmit system and second frequency deviation of said second receive-transmit system;
Said map unit; Store said mapping relations, and the mean value or the random value between first frequency deviation and second frequency deviation that are mapped as first frequency deviation, second frequency deviation, first frequency deviation and second frequency deviation to said first frequency deviation of input and second frequency deviation according to said mapping relations;
Said output unit is exported the mapping result of said map unit as the adjustment frequency deviation.
Can know by technique scheme; The present invention has following beneficial effect: the reference clock generating method of support multi-transceiving system of the present invention and the reference clock generation device of supporting multi-transceiving system; The multi-transceiving system terminal equipment of a kind of multiple mobile communication technology of supporting to comprise TD-SCDMA that is based on that problem that prior art exists proposes and support the reference clock generating method and the reference clock generation device of supporting multi-transceiving system of multi-transceiving system especially adopts a reference clock to support simultaneously the structure of multi-transceiving system in terminal equipment.Simultaneously, the reference clock generating method of support multi-transceiving system of the present invention, the reference clock generation device of support multi-transceiving system and the terminal equipment of multi-transceiving system of the present invention also can be used for any multi-transceiving system, have very strong flexibility.The present invention has further reduced the production cost of multi-transceiving system terminal equipment, and has reduced the production size at terminal, has promptly reduced the volume of terminal equipment, has improved the stability of a system.
Through accompanying drawing and embodiment, technical scheme of the present invention is done further detailed description below.
Description of drawings
Fig. 1 is the flow chart of the reference clock generating method of support multi-transceiving system of the present invention;
Fig. 2 is the sketch map of the reference clock generating method of support multi-transceiving system of the present invention;
Fig. 3 is the reference clock generating method flow chart of the support multi-transceiving system of first embodiment of the invention;
Fig. 4 is the reference clock generating method flow chart of the support multi-transceiving system of second embodiment of the invention;
Fig. 5 is the sketch map of reference clock generation device of the support multi-transceiving system of the embodiment of the invention;
Fig. 6 is applied to the sketch map of multi-transceiving system terminal equipment for the reference clock generation device of the support multi-transceiving system of the embodiment of the invention;
Fig. 7 is applied to a kind of reference clock framework of multi-transceiving system terminal equipment for the reference clock generation device of the support multi-transceiving system of the embodiment of the invention;
Fig. 8 is applied to the another kind of reference clock framework of multi-transceiving system terminal equipment for the reference clock generation device of the support multi-transceiving system of the embodiment of the invention.
Embodiment
To combine accompanying drawing and specific embodiment that the present invention is described further below.
The reference clock generation device of the reference clock generating method of support multi-transceiving system of the present invention and support multi-transceiving system; Be used for the frequency deviation control of generation and each receive-transmit system of the reference clock of multi-transceiving system, the terminal equipment of said multi-transceiving system can be mobile terminal devices such as mobile phone.
As depicted in figs. 1 and 2, the reference clock generating method of support multi-transceiving system of the present invention is used for the frequency deviation control of generation and each receive-transmit system of the reference clock of multi-transceiving system, comprising:
Step S1:, obtain an adjustment frequency deviation according to the mapping relations of setting with the initial frequency deviation of said each receive-transmit system that is obtained;
Step S2: adjust the shared reference clock of said each receive-transmit system that is provided with in the said receive-transmit system according to said adjustment frequency deviation, keep the output frequency of said reference clock constant;
Step S3: the output frequency with said reference clock is as the criterion, and calculates that the frequency deviation of said each receive-transmit system phase-locked loop allows interior frequency division parameter, and carries out frequency locking and frequency deviation control according to said frequency division parameter.
Working simultaneously with two cover system TD-SCDMA and MBSFN below is example, specifically sets forth the reference clock generating method of support multi-transceiving system of the present invention.As shown in Figure 7, under the situation that two cover system TD-SCDMA and MBSFN work simultaneously, this multi-transceiving system comprises that promptly initial frequency deviation is first receive-transmit system of first frequency deviation, i.e. TD-SCDMA system; With initial frequency deviation be second receive-transmit system of second frequency deviation, i.e. MBSFN system.Simultaneously, the reference clock generating method of support multi-transceiving system of the present invention equally also can be as shown in Figure 8, is applicable to that TD-SCDMA and CMMB work simultaneously and the application scenario of other multi-transceiving systems.
As shown in Figure 3, the reference clock generating method of the support multi-transceiving system of first embodiment of the invention, step S1 can be refined as step S11, S12; Step S2 can be refined as step S21, S22; Step S3 can be refined as step S31, S32, S33.Division is following:
Step S11: the initial frequency deviation of obtaining first receive-transmit system and second receive-transmit system; The working frequency points of receive-transmit system and initial frequency deviation all are that terminal equipments such as mobile phone can obtain its working frequency points and initial frequency deviation value through the base station when this service of access by the decision of the character of receive-transmit system self.The initial frequency deviation value of first receive-transmit system is first frequency deviation (being designated as Δ f1), and the initial frequency deviation value of second receive-transmit system is second frequency deviation (being designated as Δ f2).The working frequency points f1=2017MHz of first receive-transmit system for example, the working frequency points f1=1880MHz of second receive-transmit system.For example first frequency deviation is Δ f1=100Hz, and second frequency deviation is Δ f2=200Hz.
Step S12: first frequency deviation of getting first receive-transmit system is the adjustment frequency deviation.At this, the present invention supports the mapping relations of the reference clock generating method of multi-transceiving system to be that { Δ f1, Δ f2} are mapped as Δ f1 input collection.In first frequency deviation is 100Hz, and second frequency deviation is under the situation of 200Hz, adjustment frequency deviation Δ f=100Hz.
Step S21: according to said adjustment frequency deviation adjustment reference clock; Reference clock is provided with in multi-transceiving system; Shared this reference clock of first receive-transmit system and second receive-transmit system; Reference clock can be selected temperature compensating type quartz-crystal resonator (Temperature Compensate X ' tal (crystal) Oscillator is called for short TCXO) for use.In the frequency division formula, choosing 26MHz usually is reference frequency (f
Ref), therefore, with the output frequency adjustment f of reference clock
RefΔ f/f1.
Step S22: keep the output frequency of the said reference clock that step S21 adjusts constant, reference clock will provide reference frequency for first receive-transmit system and second receive-transmit system.
Step S31: according to the frequency division parameter of frequency division formula to calculating first receive-transmit system and second receive-transmit system.Because the initial frequency deviation of first receive-transmit system is chosen to be the adjustment frequency deviation, therefore, the phase-locked loop of first receive-transmit system can directly carry out frequency locking and frequency deviation control according to the reference frequency of reference clock output.For second receive-transmit system, then need at first calculate its frequency deviation with respect to adjusted reference clock, utilize the frequency division formula to calculate its frequency division parameter then.Employed frequency division formula can be integral frequency divisioil formula and fractional frequency division formula, if when the output frequency of reference clock becomes integral multiple to concern with the required working frequency points of receive-transmit system work, adopts the integral frequency divisioil formula; An odd lot multiple relation, then adopt the fractional frequency division formula.The selection of frequency division formula is to select in advance according to the actual conditions of system.
Step S32: through three buses the value of frequency division parameter register is set, will calculates that just the frequency division parameter of gained writes the frequency division parameter register.。
Step S33: second receive-transmit system carries out frequency locking and frequency deviation control according to frequency division parameter.Said frequency division parameter obtains through reading the frequency division parameter register.
As shown in Figure 4, the reference clock generating method of the support multi-transceiving system of second embodiment of the invention, its step S1 can be refined as step S11, S12; Step S2 can be refined as step S21, S22; Step S3 can be refined as step S31, S32, S33.Division is following:
Step S11: the initial frequency deviation of obtaining first receive-transmit system and second receive-transmit system; The working frequency points of each receive-transmit system and initial frequency deviation all are that mobile phone terminal equipment can obtain its initial frequency deviation value through the base station when this service of access by the decision of the character of each receive-transmit system self.The initial frequency deviation value of first receive-transmit system is first frequency deviation, and the initial frequency deviation value of second receive-transmit system is second frequency deviation.Suppose the working frequency points f1=2017MHz of first receive-transmit system, the working frequency points f2=1880MHz of second receive-transmit system; The first frequency deviation Δ f1=100Hz for example, the second frequency deviation Δ f2=200Hz.
Step S12: the mean value of getting first frequency deviation and second frequency deviation is the adjustment frequency deviation.At this, the present invention supports the mapping relations of the reference clock generating method of multi-transceiving system to be that { Δ f1, Δ f2} are mapped as (Δ f1+ Δ f2)/2 input collection.In first frequency deviation is 100Hz, and second frequency deviation is under the situation of 200Hz, its adjustment frequency deviation Δ f=150Hz.
Step S21: according to said adjustment frequency deviation adjustment reference clock; Reference clock is provided with in multi-transceiving system, the reference clock that a plurality of receive-transmit systems are shared.In the frequency division formula, choosing 26MHz usually is reference frequency (f
Ref), therefore, with the output frequency adjustment f of reference clock
RefΔ f/f1.
Step S22: keep the output frequency of the said reference clock that step S21 adjusts constant, reference clock will provide reference frequency for first receive-transmit system and second receive-transmit system.
Step S31: calculate the frequency deviation of first receive-transmit system earlier, according to the frequency division parameter of frequency division formula to calculating first receive-transmit system and second receive-transmit system with respect to adjusted reference clock.For first receive-transmit system, be working frequency points with f1-(Δ f-Δ f1) at first, promptly 2017MHz-50Hz is a working frequency points, brings the left end of frequency division formula (formula 1) into.Extrapolate the value of N and K, be the frequency division parameter of first receive-transmit system.
The reckoning way and first receive-transmit system of the frequency division parameter of second receive-transmit system are similar.Resulting frequency division parameter is the frequency division parameter in the corresponding receive-transmit system frequency deviation allowed band.
Step S32: through three buses the value of frequency division parameter register is set, the frequency division parameter of calculating gained is write the frequency division parameter register.
Step S33: first receive-transmit system and second receive-transmit system carry out frequency locking and frequency deviation control according to frequency division parameter.Said frequency division parameter obtains through reading the frequency division parameter register.
The reference clock generating method of support multi-transceiving system of the present invention two kinds of mapping relations in the first embodiment of the invention and second embodiment, mentioning, can also be to get the mapping relations that second frequency deviation is said adjustment frequency deviation.Or between said first frequency deviation and said second frequency deviation said adjustment frequency deviation of picked at random; This picked at random mode also can be expressed as certain proportionate relationship Δ f=k1* Δ f1+k2* Δ f2 that gets first frequency deviation and second frequency deviation; (k1+k2=1, k1>0, k2 0) for the adjustment frequency deviation.Comprehensive four kinds of above mapping relations in fact all are that being taken at the value of adjusting frequency deviation by first frequency deviation and second frequency deviation is in the open interval of two-end-point, and promptly Δ f is a value that belongs to [Δ f1, Δ f2].In this interval adjustment frequency deviation value, can reduce the complexity that two receive-transmit systems carry out the frequency adjustment on the whole.
The reference clock generating method of support multi-transceiving system of the present invention except being used in the application scenario with two receive-transmit systems of working simultaneously, also can be used in the application scenario that the receive-transmit system more than three is worked simultaneously.Its mapping relations can be that first frequency deviation of getting its first receive-transmit system is the adjustment frequency deviation.Or between its maximum initial frequency deviation and minimum initial frequency deviation the said adjustment frequency deviation of picked at random.Working simultaneously with three receive-transmit systems is example (initial frequency deviation of the 3rd receive-transmit system is recorded as Δ f3); Can pass through certain proportionate relationship; Be Δ f=k1* Δ f1+k2* Δ f2+k3* Δ f3; (k1+k2+k3=1, k1>0, k2 0, k3 0) come to confirm that adjustment frequency deviation, the value of k1, k2, k3 can reflect the relative weighting relation between each system.
Introduce the reference clock generation device of the support multi-transceiving system of the embodiment of the invention below again.
As shown in Figure 5; Realize that the present invention supports the reference clock generation device of support multi-transceiving system of the reference clock generating method of multi-transceiving system; Be used for the generation of multi-transceiving system reference clock and the frequency deviation control of each receive-transmit system, comprise mapping block, reference clock adjusting module and calculate module;
Said mapping block with the initial frequency deviation of said each receive-transmit system that is obtained, obtains an adjustment frequency deviation according to the mapping relations of setting;
Said reference clock adjusting module comprises a reference clock, according to the said adjustment frequency deviation that said mapping block transmits, adjusts said reference clock and keeps the output frequency of said reference clock constant;
Said reckoning module is as the criterion with the output frequency of said reference clock, extrapolates the frequency division parameter in frequency deviation allows of each said receive-transmit system phase-locked loop, exports said frequency division parameter.
Working simultaneously with first receive-transmit system and second receive-transmit system is example, describes each concrete module below more respectively.
Mapping block comprises input unit, map unit and output unit.Said input unit; Receive the initial frequency deviation value of each receive-transmit system that is obtained, promptly receive first frequency deviation of first receive-transmit system and second frequency deviation of said second receive-transmit system, be transmitted in connected map unit; Be used for map unit through mapping relations, draw the adjustment frequency deviation value.
Said map unit is stored said mapping relations, and the mean value or the random value between first frequency deviation and second frequency deviation that are mapped as first frequency deviation, second frequency deviation, first frequency deviation and second frequency deviation to said first frequency deviation and second frequency deviation of input;
Said output unit is exported the mapping result of said map unit as the adjustment frequency deviation.
Said reference clock adjusting module comprises adjustment unit, reference clock and frequency output unit;
Said adjustment unit is used to receive the adjustment frequency deviation of the output unit output of mapping block, reference clock is adjusted, and the frequency output of the reference clock that keeps adjusting is constant.
Said frequency output unit detects the frequency of said reference clock, and this reference frequency of phase-locked loop output to each receive-transmit system to calculating module output, is used to calculate frequency division parameter simultaneously.
Said reckoning module comprises the formula unit, calculates unit and parameter output unit;
Said reckoning unit receives the reference frequency that said frequency output unit transmits, and through the frequency division parameter of each receive-transmit system of frequency division formula to calculating, will calculate that the gained frequency division parameter is transmitted in the parameter output unit.
The frequency division formula of in the light of actual conditions choosing is stored in said formula unit, and for said reckoning unit said frequency division formula is provided.
Said parameter output unit is used for the output frequency division parameter.
Introduce the application of reference clock generation device in the multi-transceiving system terminal equipment of the support multi-transceiving system of the embodiment of the invention below.
As shown in Figure 6; In the multi-transceiving system terminal equipment; Reference clock generation device with support multi-transceiving system of the embodiment of the invention; The reference clock of the reference clock generation device of said support multi-transceiving system is each the receive-transmit system output reference frequency in the said multi-transceiving system, and the frequency division parameter that the phase-locked loop of said each receive-transmit system is extrapolated according to the reference clock generation device of said support multi-transceiving system carries out frequency locking and frequency deviation control.
The multi-transceiving system terminal equipment can be intelligent mobile terminal equipment such as mobile phone.
Said terminal equipment mainboard is provided with the frequency division parameter register; The reference clock generation device of said support multi-transceiving system is output in said frequency division parameter register with said frequency division parameter, and said each receive-transmit system obtains said frequency division parameter through reading said frequency division parameter register.
Above-describedly be merely preferable possible embodiments of the present invention; Said embodiment is not in order to limit scope of patent protection of the present invention; Therefore the equivalent structure done of every utilization specification of the present invention and accompanying drawing content changes, and in like manner all should be included in the protection model of the present invention.
Claims (8)
1. a reference clock generating method of supporting multi-transceiving system is used for the generation of multi-transceiving system reference clock and the frequency deviation control of each receive-transmit system of working simultaneously, comprising:
Step S1:, obtain an adjustment frequency deviation according to the mapping relations of setting with the initial frequency deviation of said each receive-transmit system that is obtained;
Step S2: adjust the shared reference clock of said each receive-transmit system that is provided with in the said receive-transmit system according to said adjustment frequency deviation, keep the output frequency of said reference clock constant;
Step S3: the output frequency with said reference clock is as the criterion, and calculates that the frequency deviation of said each receive-transmit system phase-locked loop allows interior frequency division parameter, and carries out frequency locking and frequency deviation control according to said frequency division parameter.
2. the reference clock generating method of support multi-transceiving system as claimed in claim 1; It is characterized in that; Said multi-transceiving system comprises that initial frequency deviation is first receive-transmit system of first frequency deviation and second receive-transmit system that initial frequency deviation is second frequency deviation, and said mapping is the said adjustment frequency deviation of picked at random between said first frequency deviation and said second frequency deviation.
3. the reference clock generating method of support multi-transceiving system as claimed in claim 2 is characterized in that, said mapping is that to get the mean value of first frequency deviation and second frequency deviation be said adjustment frequency deviation.
4. like the reference clock generating method of claim 1 or 3 described support multi-transceiving systems, it is characterized in that, through integral frequency divisioil formula or the said frequency division parameter of fractional frequency division formula to calculating.
5. the reference clock generating method of support multi-transceiving system as claimed in claim 1 is characterized in that, said multi-transceiving system comprises that initial frequency deviation is first receive-transmit system of first frequency deviation, and said mapping is that to get said first frequency deviation be said adjustment frequency deviation.
6. the reference clock generating method of support multi-transceiving system as claimed in claim 4 is characterized in that, said reference clock is TCXO.
7. reference clock generation device of supporting multi-transceiving system, the frequency deviation of each receive-transmit system of work control when being used for multi-transceiving system comprises mapping block, reference clock adjusting module and calculates module;
Said mapping block with the initial frequency deviation of said each receive-transmit system that is obtained, obtains an adjustment frequency deviation according to the mapping relations of setting;
Said reference clock adjusting module comprises the reference clock that each receive-transmit system is shared, according to the said adjustment frequency deviation that said mapping block transmits, adjusts said reference clock and keeps the output frequency of said reference clock constant;
Said reckoning module is as the criterion with the output frequency of said reference clock, extrapolates the frequency division parameter in frequency deviation allows of each said receive-transmit system phase-locked loop, exports said frequency division parameter.
8. the reference clock generation device of support multi-transceiving system as claimed in claim 7 is characterized in that said mapping block comprises input unit, map unit and output unit;
Said input unit receives first frequency deviation of first receive-transmit system and second frequency deviation of said second receive-transmit system;
Said map unit; Store said mapping relations, and the mean value or the random value between first frequency deviation and second frequency deviation that are mapped as first frequency deviation, second frequency deviation, first frequency deviation and second frequency deviation to said first frequency deviation of input and second frequency deviation according to said mapping relations;
Said output unit is exported the mapping result of said map unit as the adjustment frequency deviation.
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| CN105052100B (en) * | 2013-04-17 | 2019-08-16 | 意法-爱立信有限公司 | For adjusting method, apparatus, the mobile communication terminal of terminal frequency error |
| CN104092529B (en) * | 2014-07-24 | 2018-05-01 | 上海寰视网络科技有限公司 | A kind of clock is adjusted in synchronism system and its adjusting method |
| CN105721094B (en) * | 2016-01-29 | 2018-12-21 | 努比亚技术有限公司 | Binary channels mobile terminal and double-channel data synchronous method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7349515B1 (en) * | 2003-09-22 | 2008-03-25 | Cypress Semiconductor Corporation | Method and an apparatus to improve production yield of phase locked loops |
| CN101150819A (en) * | 2007-11-12 | 2008-03-26 | 北京天碁科技有限公司 | An automatic multi-mode mobile communication terminal and its automatic frequency control method |
| CN101286741A (en) * | 2007-04-13 | 2008-10-15 | 爱特梅尔公司 | Method and apparatus for generating synchronous clock signals from a common clock signal |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7349515B1 (en) * | 2003-09-22 | 2008-03-25 | Cypress Semiconductor Corporation | Method and an apparatus to improve production yield of phase locked loops |
| CN101286741A (en) * | 2007-04-13 | 2008-10-15 | 爱特梅尔公司 | Method and apparatus for generating synchronous clock signals from a common clock signal |
| CN101150819A (en) * | 2007-11-12 | 2008-03-26 | 北京天碁科技有限公司 | An automatic multi-mode mobile communication terminal and its automatic frequency control method |
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