CN106160761A - A kind of transmitting frequency calibration method and electronic equipment - Google Patents
A kind of transmitting frequency calibration method and electronic equipment Download PDFInfo
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- CN106160761A CN106160761A CN201510149738.9A CN201510149738A CN106160761A CN 106160761 A CN106160761 A CN 106160761A CN 201510149738 A CN201510149738 A CN 201510149738A CN 106160761 A CN106160761 A CN 106160761A
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Abstract
The invention discloses a kind of transmitting frequency calibration method, for solving the technical problem that frequency calibration mode is more single, calibration accuracy is relatively low of the crystal oscillator in electronic equipment.The invention discloses a kind of frequency calibration mode for crystal oscillator, i.e. in the duty that electronic equipment does not carries out speech business and data service, crystal oscillator is carried out frequency calibration, by transmitting frequency calibration method disclosed by the invention, precision and the accuracy of frequency calibration can be provided, frequency shift (FS) crystal oscillator caused due to the factor such as temperature, device aging can be reduced as far as possible, enhance the frequency stability of crystal oscillator.The invention also discloses corresponding electronic equipment.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of transmitting frequency calibration method and electronic equipment.
Background technology
Along with electronics, the development of communication technology and extensively applying, hyundai electronics and communication equipment are the most day by day
Become an indispensable part conventional in people's life, and agitator as in most of electronic equipments is
Electronic system provide system sequence vitals, be widely used in mobile communication system, broadcast, TV,
In the various electronic such as computer, remote controller, the most increasingly paid close attention to by people.Such as XO (Crystal
Oscillator, crystal oscillator), owing to it has the premium properties of high accuracy and high stability, by extensively
Be applied to the fields such as communication network, wireless data transmission, high-speed digital data transmission.
For agitator, this performance indications particular importance of frequency stability, and due to processing technology and
Raw-material restriction, the frequency accuracy of general XO is at 10ppm (part per million, 1/1000000th)
Left and right, and the frequency accuracy that mobile communication system typically requires needs less than 0.1ppm, the most common crystal
Agitator can not meet far away the requirement of communication system, in the prior art, in order to reach communication system
Frequency accuracy requirement, typically uses AFC (Automatic Frequency in the communication process of electronic equipment
Control, automatic frequency controls) technology is automatically adjusted the frequency of oscillation of XO, make it stable a certain pre-
Near the standard frequency (such as 0.1ppm) of phase, to ensure that communication system is to the frequency accuracy of XO as far as possible
Requirement.
Because the frequency accuracy of XO is typically at 10ppm, in order to reach the 0.1ppm of communication system requirements,
Before AFC calibration in communication engineering, typically can the most slightly calibrate, make the frequency of XO by 10ppm
Drop to the value of relatively 0.1ppm, so that mobile terminal device (such as mobile phone) is in communication process
AFC calibrates faster, more accurate, such as prior art is usually the most first by the frequency accuracy of XO from 10ppm
Being adjusted to 2ppm (being such as referred to as thick calibration), the purpose of do so is to ensure that the frequency of electronic equipment can be use up
Amount and base station synchronization, to ensure the normal use of electronic equipment, the mode such as generally used is e.g. at hands
The production process of machine is carried out single to mobile phone at product line by manufacturer and slightly calibrates.
But, owing to the frequency accuracy of XO is relatively big for communication performance impact, and along with communication system
Frequency range is more and more higher, such as the communication system of this transmit-receive cofrequency of TDD B41LTE system, along with
The change of temperature, the frequency shift (FS) of XO will increase, and the frequency accuracy of XO is it is possible to calibrate more than AFC
The 2ppm of front requirement, thus affect the performance of communication system.
Visible, in the prior art, the thick calibrating mode ratio before XO AFC calibration in communication process
More single, the precision of calibration also ratio is relatively low, it is impossible to reach the frequency accuracy of communication system requirements.
Summary of the invention
The embodiment of the present invention provides a kind of information processing method and electronic equipment, for solving the frequency school of XO
The technical problem that quasi-mode is more single, calibration accuracy is relatively low.
On the one hand, the embodiment of the present invention provides a kind of transmitting frequency calibration method, is applied to electronic equipment, described side
Method includes:
When described electronic equipment is in the duty not carrying out speech business and data service, receives and launch
Signal；
Demodulate described transmitting signal, obtain the first frequency, demodulation frequency；Wherein, described first frequency, demodulation frequency is and incites somebody to action
The frequency that signal that described transmitting signal obtains after being demodulated is corresponding；
Determine the frequency error between described first frequency, demodulation frequency and tranmitting frequency；Wherein, described tranmitting frequency
For transmitting the frequency of the channel of described transmitting signal；
Judge whether the frequency error between described first frequency, demodulation frequency and tranmitting frequency is preset frequently less than first
Rate error；
If it is not, adjust the first load electricity of oscillating circuit corresponding with crystal oscillator in described electronic equipment
Hold, so that the frequency error between described first frequency, demodulation frequency and tranmitting frequency is less than described first predeterminated frequency
Error；Wherein, described crystal oscillator is for providing system sequence for described electronic equipment in described electronic equipment
Parts, described first load capacitance is a part for the total load capacitance of described oscillating circuit.
Optionally, when described electronic equipment is in the duty not carrying out speech business and data service,
Receive and launch signal, specifically include:
When described electronic equipment is in the duty not carrying out speech business and data service, it is received as institute
State the paging signal that electronic equipment provides the communication base station of communication service to send.
Optionally, when described electronic equipment is in the duty not carrying out speech business and data service,
Receive and launch signal, specifically include:
When described electronic equipment is in the duty not carrying out speech business and data service, by described
Radio-frequency transmitter in electronic equipment receives the described transmitting that the radio frequency sending set in described electronic equipment is launched
Signal.
Optionally, by the radio frequency in the radio-frequency transmitter described electronic equipment of reception in described electronic equipment
Before the described transmitting signal that transmitter is launched, described method also includes:
Connect in the RF front-end module in described electronic equipment of radio-frequency transmissions loop and radio frequency reception loop
Logical, so that forming transmitting-receiving loop between described radio-frequency transmissions loop and described radio frequency reception loop；Wherein, institute
Stating radio-frequency transmissions loop is the circuit corresponding with the transmitter in described electronic equipment, described radio frequency reception loop
For the circuit corresponding with the receiver in described electronic equipment；
Described transmitting signal is sent to described radio-frequency transmitter by described radio frequency sending set.
Optionally, when described electronic equipment is in the duty not carrying out speech business and data service,
Receiving before launching signal, described method also includes:
During the debugging of described electronic equipment, at a temperature of debugging at M, M is the integer more than 1,
Perform following steps respectively:
Receive input signal；
Demodulate described input signal, obtain the second frequency, demodulation frequency；Wherein, described second frequency, demodulation frequency is for by institute
State the frequency that the signal obtained after input signal is demodulated is corresponding；
Judge whether described second frequency, demodulation frequency is less than the second predeterminated frequency by mistake with the frequency error of incoming frequency
Difference；Wherein, described incoming frequency is the frequency of the channel transmitting described input signal；
If it is not, adjust the second load capacitance of described oscillating circuit, so that described second frequency, demodulation frequency and input
The frequency error of frequency is less than described second predeterminated frequency error；Wherein, the value of described second load capacitance is big
In the value of described first load capacitance, the load that described first load capacitance is constituted with described second load capacitance
The equivalent capacity of electric capacity is described total load capacitance.
On the other hand, the embodiment of the present invention also provides for a kind of electronic equipment, including:
First receiver module, for not carrying out the work shape of speech business and data service at described electronic equipment
During state, receive and launch signal；
First demodulation module, is used for demodulating described transmitting signal, obtains the first frequency, demodulation frequency；Wherein, described
First frequency, demodulation frequency be with described transmitting signal is demodulated after frequency corresponding to the signal that obtains；
First determines module, for determining the frequency error between described first frequency, demodulation frequency and tranmitting frequency；
Wherein, described tranmitting frequency is the frequency of the channel transmitting described transmitting signal；
First judge module, for judging that the frequency error between described first frequency, demodulation frequency and tranmitting frequency is
No it is less than the first predeterminated frequency error；
First adjusting module, for if it is not, adjust vibration corresponding with crystal oscillator in described electronic equipment
First load capacitance of circuit, so that the frequency error between described first frequency, demodulation frequency and tranmitting frequency is less than
Described first predeterminated frequency error；Wherein, for described electronics during described crystal oscillator is described electronic equipment
Equipment provides the parts of system sequence, and described first load capacitance is the total load capacitance of described oscillating circuit
A part.
Optionally, described first receiver module specifically for:
When described electronic equipment is in the duty not carrying out speech business and data service, it is received as institute
State the paging signal that electronic equipment provides the communication base station of communication service to send.
Optionally, described first receiver module specifically for:
When described electronic equipment is in the duty not carrying out speech business and data service, by described
Radio-frequency transmitter in electronic equipment receives the described transmitting that the radio frequency sending set in described electronic equipment is launched
Signal.
Optionally, described electronic equipment also includes connectivity module and transmitter module:
Described connectivity module, is used at described receiver module specifically for by the radio frequency in described electronic equipment
Before receiver receives the described transmitting signal that the radio frequency sending set in described electronic equipment is launched, radio frequency is sent out
Connect in being emitted back towards road and the radio frequency reception loop RF front-end module in described electronic equipment so that described in penetrate
Frequently transmitting-receiving loop is formed between launching circuit and described radio frequency reception loop；Wherein, described radio-frequency transmissions loop
For the circuit corresponding with the transmitter in described electronic equipment, described radio frequency reception loop is for set with described electronics
The circuit that standby interior receiver is corresponding；
Described transmitter module, for sending described transmitting by described radio frequency sending set to described radio-frequency transmitter
Signal.
Optionally, described electronic equipment also includes the second receiver module, the second demodulation module, second judges mould
Block and the second adjusting module:
Described second receiver module, for during the debugging of described electronic equipment, M debugging temperature
Under degree, receive input signal respectively；
Described second demodulation module, is used for demodulating described input signal, obtains the second frequency, demodulation frequency；Wherein,
Described second frequency, demodulation frequency be described input signal is demodulated after frequency corresponding to the signal that obtains；
Described second judge module, for judging that described second frequency, demodulation frequency with the frequency error of incoming frequency is
No it is less than the second predeterminated frequency error；Wherein, described incoming frequency is to transmit the channel of described input signal
Frequency；
Described second adjusting module, is used for if it is not, adjust the second load capacitance of described oscillating circuit, so that
Described second frequency, demodulation frequency is less than described second predeterminated frequency error with the frequency error of incoming frequency；Wherein,
The value of described second load capacitance is more than the value of described first load capacitance, and described first load capacitance is with described
The equivalent capacity of the load capacitance that the second load capacitance is constituted is described total load capacitance.
Embodiments provide a kind of work not carrying out speech business and data service at electronic equipment
Transmitting frequency calibration method in state, i.e. in the use process (non-communicating process) after electronic equipment dispatches from the factory
To frequency calibration so that the frequency error of the XO in electronic equipment can all-the-time stable at the first predeterminated frequency
Near error (2ppm in such as background technology), so can reduce making due to electronic equipment as far as possible
With and the impact on XO frequency stability of the temperature that produces, can by frequency calibration compensate XO due to
Stabilizing influence and the frequency shift (FS) that produces, such that it is able to ensure the stability of XO frequency of oscillation as far as possible, reach
The communication system requirement to XO frequency stability, to improve the communication performance of electronic equipment.
Further, the transmitting frequency calibration method in the embodiment of the present invention can be that periodically timing is carried out, such as, often
Primary calibration is carried out, so, (i.e. from nothing of dispatching from the factory in the whole use cycle of electronic equipment every 3 minutes
Method use), can reduce as far as possible the parameter due to each active device in XO device aging, oscillating circuit,
The impact on XO frequency of the other factorses such as supply voltage, such that it is able to improve the precision of frequency calibration, strengthens
The frequency stability of XO.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to enforcement
In example or description of the prior art, the required accompanying drawing used is briefly described, it should be apparent that, describe below
In accompanying drawing be only the embodiment of the present invention, for those of ordinary skill in the art, do not paying creation
Property work on the premise of, it is also possible to obtain other accompanying drawing according to the accompanying drawing provided.
Fig. 1 is the broad flow diagram of embodiment of the present invention medium frequency calibration steps；
When Fig. 2 is that in the embodiment of the present invention, electronic equipment is mobile phone, each several part circuit structure frame of interior of mobile phone
The schematic diagram of figure；
Fig. 3 is the schematic diagram of crystal oscillating circuit corresponding with XO in the embodiment of the present invention；
Fig. 4 is the primary structure block diagram of electronic equipment in the embodiment of the present invention.
Detailed description of the invention
The embodiment of the present invention provides a kind of transmitting frequency calibration method, is applied in electronic equipment, and described method includes:
When described electronic equipment is in the duty not carrying out speech business and data service, receives and launch letter
Number；Demodulate described transmitting signal, obtain the first frequency, demodulation frequency；Wherein, described first frequency, demodulation frequency is and incites somebody to action
The frequency that signal that described transmitting signal obtains after being demodulated is corresponding；Determine described first frequency, demodulation frequency and send out
Frequency error between radio frequency rate；Wherein, described tranmitting frequency is the frequency of the channel transmitting described transmitting signal
Point；Judge that whether the frequency error between described first frequency, demodulation frequency and tranmitting frequency is less than the first predeterminated frequency
Error；If it is not, adjust the first load electricity of oscillating circuit corresponding with crystal oscillator in described electronic equipment
Hold, so that the frequency error between described first frequency, demodulation frequency and tranmitting frequency is less than described first predeterminated frequency
Error；Wherein, described crystal oscillator is for providing system sequence for described electronic equipment in described electronic equipment
Parts, described first load capacitance is a part for the total load capacitance of described oscillating circuit.
Embodiments provide a kind of work not carrying out speech business and data service at electronic equipment
Transmitting frequency calibration method in state, i.e. in the use process (non-communicating process) after electronic equipment dispatches from the factory
To frequency calibration so that the frequency error of the XO in electronic equipment can all-the-time stable at the first predeterminated frequency
Near error (2ppm in such as background technology), so can reduce making due to electronic equipment as far as possible
With and the impact on XO frequency stability of the temperature that produces, can by frequency calibration compensate XO due to
Stabilizing influence and the frequency shift (FS) that produces, such that it is able to ensure the stability of XO frequency of oscillation as far as possible, reach
The communication system requirement to XO frequency stability, to improve the communication performance of electronic equipment.
Further, the transmitting frequency calibration method in the embodiment of the present invention can be that periodically timing is carried out, such as, often
Primary calibration is carried out, so, (i.e. from nothing of dispatching from the factory in the whole use cycle of electronic equipment every 3 minutes
Method use), can reduce as far as possible the parameter due to each active device in XO device aging, oscillating circuit,
The impact on XO frequency of the other factorses such as supply voltage, such that it is able to improve the precision of frequency calibration, strengthens
The frequency stability of XO.
For making the object, technical solutions and advantages of the present invention clearer, real below in conjunction with the present invention
Execute the accompanying drawing in example, the technical scheme in the embodiment of the present invention be clearly and completely described, it is clear that
Described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based on this
Embodiment in bright, the institute that those of ordinary skill in the art are obtained under not making creative work premise
There are other embodiments, broadly fall into the scope of protection of the invention.Reality in the case of not conflicting, in the present invention
Executing the feature in example and embodiment can mutual combination in any.And, although show logic in flow charts
Sequentially, but in some cases, can be to be different from the step shown or described by order execution herein.
It addition, the terms "and/or", a kind of incidence relation describing affiliated partner, represent
Three kinds of relations, such as, A and/or B can be there are, can represent: individualism A, there is A simultaneously
And B, individualism B these three situation.It addition, character "/" herein, do not doing the feelings illustrated
Under condition, typically represent the forward-backward correlation relation to liking a kind of "or".
In the embodiment of the present invention, described electronic equipment may refer to smart mobile phone, TV, PAD (flat board electricity
Brain), the different electronic equipment of computer etc., for described electronic equipment specifically which type of equipment this
Bright do not limit, as long as described electronic equipment includes XO.
In order to be better understood from technique scheme, below in conjunction with Figure of description and concrete embodiment party
Technique scheme is described in detail by formula.
Referring to Fig. 1, the embodiment of the present invention provides a kind of transmitting frequency calibration method, and described method can apply to
Electronic equipment, the main flow of described method is described as follows:
Step 101: when described electronic equipment is in the duty not carrying out speech business and data service,
Receive and launch signal.
In the embodiment of the present invention, being as a example by mobile phone by electronic equipment, mobile phone does not carries out the work shape of speech business
State may refer to carry out, with other mobile phone, the talking state conversed, and mobile phone does not carries out the work shape of data service
State may refer to mobile phone and do not uses the state of communication network, the flow such as not using communications service provider to provide to enter
The state that row data are uploaded or downloaded, say, that mobile phone does not carries out the work of speech business and data service
Can be understood as mobile phone as state and do not carry out the work of data interaction with providing the communication base station of communication service for it
Make state.
Further, in the embodiment of the present invention, the duty of indication may refer to the state after mobile phone is successfully started shooting,
The most do not include state during mobile phone shutdown, so can ensure that mobile phone is able to receive that transmitting signal.And
It addition, electronic equipment can be to be periodically received transmitting signal, such as, received one every 3 minutes
Secondary, specifically it is set to the cycle of reception how long to be arranged voluntarily by user, such as, can consider electricity
Subset use duration, weather etc. because usually arranging the concrete cycle, so can try one's best according to electricity
The practical situation of subset arranges the suitable reception cycle, on the premise of ensureing calibration accuracy, it is also possible to the greatest extent
Amount reduces the power consumption of electronic equipment.Or, electronic equipment can also randomly choose and receive the moment launching signal,
Receive the most at random or all receive, etc., the present invention is not particularly limited.
It is to say, the transmitting frequency calibration method in the embodiment of the present invention be mobile phone not with corresponding communication base station
The when of carrying out data interaction, frequency calibration that the XO in electronic equipment is carried out, with reduce as far as possible due to
The impact on the frequency stability of XO of the factor such as temperature, device aging.
In specific implementation process, electronic equipment is the transmitting signal of whose transmitting received, say, that
Launch signal transmitting terminal specifically who, the embodiment of the present invention provides two kinds of different transmitting terminals.
Optionally, in the embodiment of the present invention, it is at described electronic equipment and does not carries out speech business and data industry
During the duty being engaged in, receive and launch signal, specifically may include that
When described electronic equipment is in the duty not carrying out speech business and data service, it is received as institute
State the paging signal that electronic equipment provides the communication base station of communication service to send.
It is, the transmitting terminal launching signal may refer to provide the communication base of communication service into electronic equipment
Standing, and launch signal and may refer to the paging signal that communication base station is launched, in specific implementation process, communicate base
Stand and timing electronic equipment can be sent paging signal.
Optionally, in the embodiment of the present invention, it is at described electronic equipment and does not carries out speech business and data industry
During the duty being engaged in, receive and launch signal, specifically may include that
When described electronic equipment is in the duty not carrying out speech business and data service, by described
Radio-frequency transmitter in electronic equipment receives the described transmitting that the radio frequency sending set in described electronic equipment is launched
Signal.
Also just saying, the transmitting terminal launching signal may refer to the radio frequency sending set in electronic equipment, and launches letter
Number can be to be received by the radio-frequency transmitter in electronic equipment, at specific implementation process, radio frequency sending set
By the way of timing is launched, electronic equipment can also be sent and launch signal.
Sent out by the radio frequency in electronic equipment for the ease of skilled artisan understands that in the embodiment of the present invention
Penetrate machine and transmitting signal is launched and received to equipment receiver, respectively below from describing implementation process in detail.
Optionally, in the embodiment of the present invention, described being received by the radio-frequency transmitter in described electronic equipment
Before the described transmitting signal that radio frequency sending set in electronic equipment is launched, described method can also include:
Connect in the RF front-end module in described electronic equipment of radio-frequency transmissions loop and radio frequency reception loop
Logical, so that forming transmitting-receiving loop between described radio-frequency transmissions loop and described radio frequency reception loop；Wherein, institute
Stating radio-frequency transmissions loop is the circuit corresponding with the transmitter in described electronic equipment, described radio frequency reception loop
For the circuit corresponding with the receiver in described electronic equipment；
Described transmitting signal is sent to described radio-frequency transmitter by described radio frequency sending set.
It is as a example by mobile phone by electronic equipment, refers to Fig. 2, Fig. 2 and show each several part circuit of interior of mobile phone
Signal between the schematic diagram of structured flowchart, and each several part circuit structure flows to schematically illustrate.Wherein, originally
Radio frequency sending set in inventive embodiments and radio-frequency transmitter i.e. radio-frequency transmissions path shown in corresponding diagram 2 and
Radio frequency reception path, and the crystal oscillating circuit shown in Fig. 2 is and XO pair in the embodiment of the present invention
The oscillating circuit answered.
In specific implementation process, in order to XO being carried out frequency calibration, Ke Yitong by electronic equipment self
Cross the radio-frequency transmitter in electronic equipment and receive the described transmitting letter that the radio frequency sending set in electronic equipment is launched
Number, and before this, need radio-frequency transmissions loop (circuit loop being i.e. made up of radio-frequency transmissions path)
Before radio frequency reception loop (circuit loop being i.e. made up of radio frequency reception path) radio frequency in electronic equipment
Connect in end module, so that the transmitting signal launched by radio frequency sending set can be connect by radio-frequency transmitter
Receive, by ensure can by the embodiment of the present invention in the way of XO is calibrated.
Step 102: demodulate described transmitting signal, obtain the first frequency, demodulation frequency；Wherein, described first demodulation
Frequency be with described transmitting signal is demodulated after frequency corresponding to the signal that obtains.
After receiving transmitting signal, electronic equipment can be demodulated launching signal, with according to launching letter
Number obtain the first frequency, demodulation frequency.
Step 103: determine the frequency error between described first frequency, demodulation frequency and tranmitting frequency；Wherein, institute
State the frequency that tranmitting frequency is the channel transmitting described transmitting signal.
In general, transmitting terminal, when sending transmitting signal to electronic equipment, carries out signal by channel
Transmission, and the frequency corresponding with signal transmission volume channel i.e. can be understood as launching the tranmitting frequency of signal.
Wherein, the occurrence of tranmitting frequency and the communication standard of employing are relevant with communications band.Such as, communication
Communication standard conventional in system has CDMA (Code Division Multiple Access, CDMA)
Communication standard, WCDMA (Wideband Code Division Multiple Access Wireless, broadband
CDMA) communication standard, LTE (Long Term Evolution, Long Term Evolution) communication standard, etc.
Deng.For example be the band110700 channel in WCDMA communication standard, then corresponding transmitting
Frequency is exactly 2140MHz.
In specific implementation process, concrete which kind of communication standard of employing and communications band, can be according to transmitting
Depending on the practical situation of end, the present invention is not particularly limited.
Step 104: judge that the frequency error between described first frequency, demodulation frequency and tranmitting frequency is whether less than the
One predeterminated frequency error.
First frequency, demodulation frequency and corresponding tranmitting frequency are compared, it is possible to obtain frequency error,
Again frequency error and the first predeterminated frequency error are compared, it is thus achieved that comparative result, in specific implementation process
In, the first predeterminated frequency error could be arranged to 2ppm.
When comparative result shows that frequency error is less than 2ppm, show that the frequency of XO in electronic equipment is inclined
Shifting amount is not very big, can meet the communicating requirement in communication system, then can terminate flow process.
When comparative result shows that frequency error is not less than 2ppm, show the frequency of XO in electronic equipment
Side-play amount is bigger, it is impossible to meets the communicating requirement in communication system, then continues executing with step 105.
As a example by tranmitting frequency is as 2140MHz, if the frequency error allowing XO is just 2ppm, that
The absolute difference allowing the first frequency, demodulation frequency and 2014MHZ at 2140MHZ 2/1000000ths (i.e.
Within 4280HZ), according to the frequency range that can be calculated the first frequency, demodulation frequency be [2139995720HZ,
2014004280HZ]。
Step 105: if it is not, adjust the of oscillating circuit corresponding with crystal oscillator in described electronic equipment
One load capacitance, so that the frequency error between described first frequency, demodulation frequency and tranmitting frequency is less than described first
Predeterminated frequency error；Wherein, described crystal oscillator is for providing for described electronic equipment in described electronic equipment
The parts of system sequence, described first load capacitance is a part for the total load capacitance of described oscillating circuit.
In the embodiment of the present invention, the hardware circuit corresponding with XO is properly termed as crystal oscillating circuit, typically
XO is that the form with chip is integrated, and crystal oscillating circuit can include XO and load capacitance.
The frequency of oscillation of crystal oscillating circuit for example, f, and the computing formula of frequency f is:
Wherein L is the equivalent inductance of XO, and C is load capacitance, due to the characteristic of XO self, equivalent inductance
L can cause frequency f also can change and produce frequency shift (FS), in order to support along with environment or variations in temperature
The frequency shift (FS) that the L that disappears changes and causes, can be adjusted load capacitance C so that f keeps constant.
Refer to the schematic diagram that Fig. 3, Fig. 3 are crystal oscillating circuit, wherein, electric capacity C01, C02, C11
Load capacitance C being in the embodiment of the present invention with the equivalent capacity of C12 composition, wherein, the first load electricity
Hold and may refer to the equivalent capacity that C11 and C12 is constituted.
When detecting that frequency error is less than described first predeterminated frequency error, show the frequency shift (FS) of XO relatively
Greatly, now it is likely due to L change, it is possible to C11 and C12 is adjusted, so that f
Keep constant, when adjusting C11 and C12, C01 and C02 can be allowed to keep constant.It is being embodied as
During, the capacitance of C01 and C02 can be set to pF level, and can be by C11 and C12
Capacitance be set to (1/10) pF level.
In the embodiment of the present invention, C11 and C12 repeatedly can be adjusted, until frequency error is less than the
One predeterminated frequency error, when after once adjusting at certain, frequency error has been less than the first predeterminated frequency error,
Just the capacitance of now C11 and C12 can be stored NVRAM (Non-Volatile in the electronic device
Memory, nonvolatile memory) in, then, C11 and C12 has just had the NV value of correspondence, when
In time repeatedly calibrating, NV value the most corresponding with C11 and C12 can be updated in real time.
In the embodiment of the present invention, embodiments provide a kind of electronic equipment do not carry out speech business and
Transmitting frequency calibration method in the duty of data service, i.e. the use process after electronic equipment dispatches from the factory is (non-
Communication process) in frequency calibration so that the frequency error of the XO in electronic equipment can all-the-time stable exist
Near first predeterminated frequency error (such as 2ppm), so can reduce making due to electronic equipment as far as possible
With and the impact on XO frequency stability of the temperature that produces, can by frequency calibration compensate XO due to
Stabilizing influence and the frequency shift (FS) that produces, such that it is able to ensure the stability of XO frequency of oscillation as far as possible, reach
The communication system requirement to XO frequency stability, to improve the communication performance of electronic equipment.
Further, the transmitting frequency calibration method in the embodiment of the present invention can be that periodically timing is carried out, such as, often
Primary calibration is carried out, so, (i.e. from nothing of dispatching from the factory in the whole use cycle of electronic equipment every 3 minutes
Method use), can reduce as far as possible the parameter due to each active device in XO device aging, oscillating circuit,
The impact on XO frequency of the other factorses such as supply voltage, such that it is able to improve the precision of frequency calibration, strengthens
The frequency stability of XO.
Optionally, in the embodiment of the present invention, it is at described electronic equipment and does not carries out speech business and data industry
During the duty being engaged in, receiving before launching signal, described method can also include:
During the debugging of described electronic equipment, at a temperature of debugging at M, M is the integer more than 1,
Perform following steps respectively:
Receive input signal；
Demodulate described input signal, obtain the second frequency, demodulation frequency；Wherein, described second frequency, demodulation frequency is for by institute
State the frequency that the signal obtained after input signal is demodulated is corresponding；
Judge whether described second frequency, demodulation frequency is less than the second predeterminated frequency by mistake with the frequency error of incoming frequency
Difference；Wherein, described incoming frequency is the frequency of the channel transmitting described input signal；
If it is not, adjust the second load capacitance of described oscillating circuit, so that described second frequency, demodulation frequency and input
The frequency error of frequency is less than described second predeterminated frequency error；Wherein, the value of described second load capacitance is big
In the value of described first load capacitance, the load that described first load capacitance is constituted with described second load capacitance
The equivalent capacity of electric capacity is described total load capacitance.
The embodiment of the present invention additionally provides the frequency calibration mode of a kind of XO, i.e. dispatch from the factory it at electronic equipment
During front debugging, artificially can be calibrated by the manufacturer of electronic equipment, to ensure that electronics sets as far as possible
Frequency Synchronization can be kept with communication base station rapidly for after dispatching from the factory, be user-friendly to.
Frequency calibration principle in the embodiment of the present invention is similar with step 101-105, and difference is,
Frequency calibration mode in step 101-105 is that electronic equipment is calibrated automatically, in the embodiment of the present invention is
Artificially for electronic equipment input input signal so that electronic equipment obtains incoming frequency and calibrates, and,
Step 101-105 alignment make f keep constant by adjusting electric capacity C11 and C12, and the present invention is real
Execute in example is to make f keep constant, because the value of C01 and C02 is equal by adjustment electric capacity C01 and C02
More than C11 and C12, it is possible to make the frequency error of XO rapidly by adjusting C01 and C02
It is reduced to 2ppm by 10ppm, improves the speed of frequency calibration.
In the embodiment of the present invention, the second predeterminated frequency error can be identical, the most all with the first predeterminated frequency error
For 2ppm, or 2ppm, for example, 2.5ppm can also be slightly larger than, so, dispatch from the factory at electronic equipment
Afterwards, it is possible within quickly its frequency error being calibrated to 2ppm by the calibration steps of step 101-105.
Compared with prior art, the embodiment of the present invention is to calibrate respectively, so at a temperature of multiple debugging
The calibration curve at a temperature of multiple debugging can be obtained, improve the precision of calibration.In specific implementation process,
From the operating temperature range of electronic equipment, M debugging temperature can be carried out value, as specifically taking how many
Individual debugging temperature is debugged, it is also possible to determine according to the operating temperature range of electronic equipment.Such as, in order to
Ensureing precision and the accuracy of calibration, can the value of M be arranged is more, and in M debugging temperature
Each between interval difference can arrange less.
Similar with the processing mode in step 105, by adjusting C01 and C02 at a temperature of M debugging
Value make the frequency error of XO be reduced to 2.5ppm or 2ppm after, just will now C01 and C02
Corresponding capacitance is stored in NVRAM, i.e. C01 and C02 has just had the NV value of correspondence, when
After repeatedly calibration, NV value the most corresponding with C01 and C02 can be updated in real time, then, C01
Just there is the NV value of correspondence with C02, when after repeatedly calibration, distinguished the most corresponding with C11 and C12
NV value can be updated in real time, electronic equipment actually used during, can according to the change of temperature come
In real-time calling NVRAM with the Current Temperatures C01 and C02 value under corresponding, to realize adjusting in real time,
Reduce frequency shift (FS) XO caused due to temperature as far as possible.
Referring to Fig. 4, based on same inventive concept, the embodiment of the present invention also provides for a kind of electronic equipment, institute
State electronic equipment include first receiver module the 401, first demodulation module 402, first determine module 403,
One judge module 404 and the first adjusting module 405.
First receiver module 401, for not carrying out the work of speech business and data service at described electronic equipment
When making state, receive and launch signal；
First demodulation module 402, is used for demodulating described transmitting signal, obtains the first frequency, demodulation frequency；Wherein,
Described first frequency, demodulation frequency be with described transmitting signal is demodulated after frequency corresponding to the signal that obtains；
First determines module 403, for determining the frequency between described first frequency, demodulation frequency and tranmitting frequency by mistake
Difference；Wherein, described tranmitting frequency is the frequency of the channel transmitting described transmitting signal；
First judge module 404, for judging that the frequency between described first frequency, demodulation frequency and tranmitting frequency is missed
Whether difference is less than the first predeterminated frequency error；
First adjusting module 405, for if it is not, adjust in described electronic equipment corresponding with crystal oscillator
First load capacitance of oscillating circuit, so that the frequency error between described first frequency, demodulation frequency and tranmitting frequency
Less than described first predeterminated frequency error；Wherein, for described during described crystal oscillator is described electronic equipment
Electronic equipment provides the parts of system sequence, and described first load capacitance is the total load electricity of described oscillating circuit
The part held.
Optionally, in the embodiment of the present invention, the first receiver module 401 specifically may be used for:
When described electronic equipment is in the duty not carrying out speech business and data service, it is received as institute
State the paging signal that electronic equipment provides the communication base station of communication service to send.
Optionally, in the embodiment of the present invention, the first receiver module 401 specifically may be used for:
When described electronic equipment is in the duty not carrying out speech business and data service, by described
Radio-frequency transmitter in electronic equipment receives the described transmitting that the radio frequency sending set in described electronic equipment is launched
Signal.
Optionally, in the embodiment of the present invention, described electronic equipment can also include connectivity module and transmitter module:
Described connectivity module, is used at described receiver module specifically for by the radio frequency in described electronic equipment
Before receiver receives the described transmitting signal that the radio frequency sending set in described electronic equipment is launched, radio frequency is sent out
Connect in being emitted back towards road and the radio frequency reception loop RF front-end module in described electronic equipment so that described in penetrate
Frequently transmitting-receiving loop is formed between launching circuit and described radio frequency reception loop；Wherein, described radio-frequency transmissions loop
For the circuit corresponding with the transmitter in described electronic equipment, described radio frequency reception loop is for set with described electronics
The circuit that standby interior receiver is corresponding；
Described transmitter module, for sending described transmitting by described radio frequency sending set to described radio-frequency transmitter
Signal.
Optionally, in the embodiment of the present invention, described electronic equipment can also include the second receiver module, second
Demodulation module, the second judge module and the second adjusting module:
Described second receiver module, for during the debugging of described electronic equipment, M debugging temperature
Under degree, receive input signal respectively；
Described second demodulation module, is used for demodulating described input signal, obtains the second frequency, demodulation frequency；Wherein,
Described second frequency, demodulation frequency be described input signal is demodulated after frequency corresponding to the signal that obtains；
Described second judge module, for judging that described second frequency, demodulation frequency with the frequency error of incoming frequency is
No it is less than the second predeterminated frequency error；Wherein, described incoming frequency is to transmit the channel of described input signal
Frequency；
Described second adjusting module, is used for if it is not, adjust the second load capacitance of described oscillating circuit, so that
Described second frequency, demodulation frequency is less than described second predeterminated frequency error with the frequency error of incoming frequency；Wherein,
The value of described second load capacitance is more than the value of described first load capacitance, and described first load capacitance is with described
The equivalent capacity of the load capacitance that the second load capacitance is constituted is described total load capacitance.
In the embodiment of the present invention, owing to electronic equipment and said frequencies calibration steps solve principle and the letter of problem
Breath processing method is similar, and therefore the enforcement of this electronic equipment may refer to the enforcement of method, does not repeats them here.
Embodiments provide a kind of work not carrying out speech business and data service at electronic equipment
Transmitting frequency calibration method in state, i.e. in the use process (non-communicating process) after electronic equipment dispatches from the factory
To frequency calibration so that the frequency error of the XO in electronic equipment can all-the-time stable at the first predeterminated frequency
Near error (2ppm in such as background technology), so can reduce making due to electronic equipment as far as possible
With and the impact on XO frequency stability of the temperature that produces, can by frequency calibration compensate XO due to
Stabilizing influence and the frequency shift (FS) that produces, such that it is able to ensure the stability of XO frequency of oscillation as far as possible, reach
The communication system requirement to XO frequency stability, to improve the communication performance of electronic equipment.
Further, the transmitting frequency calibration method in the embodiment of the present invention can be that periodically timing is carried out, such as, often
Primary calibration is carried out, so, (i.e. from nothing of dispatching from the factory in the whole use cycle of electronic equipment every 3 minutes
Method use), can reduce as far as possible the parameter due to each active device in XO device aging, oscillating circuit,
The impact on XO frequency of the other factorses such as supply voltage, such that it is able to improve the precision of frequency calibration, strengthens
The frequency stability of XO.
Those skilled in the art is it can be understood that arrive, for convenience and simplicity of description, only with above-mentioned
The division of each functional module is illustrated, and in actual application, can above-mentioned functions be divided as desired
Join and completed by different functional units, the internal structure of device will be divided into different functional units, with complete
Become all or part of function described above.The specific works mistake of the system of foregoing description, device and unit
Journey, is referred to the corresponding process in preceding method embodiment, does not repeats them here.
In several embodiments provided by the present invention, it should be understood that disclosed system, device and side
Method, can realize by another way.Such as, device embodiment described above is only schematically
, such as, described module or the division of unit, be only a kind of logic function and divide, actual can when realizing
There to be other dividing mode, the most multiple unit or assembly can in conjunction with or be desirably integrated into another and be
Unite, or some features can be ignored, or do not perform.Another point, shown or discussed coupling each other
Conjunction or direct-coupling or communication connection can be the INDIRECT COUPLING by some interfaces, device or unit or communication
Connect, can be electrical, machinery or other form.
The described unit illustrated as separating component can be or may not be physically separate, as
The parts that unit shows can be or may not be physical location, i.e. may be located at a place, or
Can also be distributed on multiple NE.Can select therein some or all of according to the actual needs
Unit realizes the purpose of the present embodiment scheme.
It addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit,
Can also be that unit is individually physically present, it is also possible to two or more unit are integrated in a unit
In.Above-mentioned integrated unit both can realize to use the form of hardware, it would however also be possible to employ SFU software functional unit
Form realizes.
If described integrated unit realizes and as independent production marketing using the form of SFU software functional unit
Or when using, can be stored in a computer read/write memory medium.Based on such understanding, this
Part that prior art is contributed by bright technical scheme the most in other words or this technical scheme complete
Portion or part can embody with the form of software product, and this computer software product is stored in a storage
In medium, including some instructions with so that computer equipment (can be personal computer, server,
Or the network equipment etc.) or processor (processor) perform the complete of method described in each embodiment of the present invention
Portion or part steps.And aforesaid storage medium includes: USB flash disk, portable hard drive, ROM (Read-Only
Memory, read only memory), RAM (RAM, Random Access Memory, deposit by random access memory
Reservoir), the various media that can store program code such as magnetic disc or CD.
Specifically, the computer program instructions that a kind of transmitting frequency calibration method in the embodiment of the present invention is corresponding can
To be stored in CD, hard disk, on the storage medium such as USB flash disk, when in storage medium with a kind of frequency calibration
When computer program instructions corresponding to method is read by an electronic equipment or be performed, comprise the steps:
When described electronic equipment is in the duty not carrying out speech business and data service, receives and launch
Signal；
Demodulate described transmitting signal, obtain the first frequency, demodulation frequency；Wherein, described first frequency, demodulation frequency is and incites somebody to action
The frequency that signal that described transmitting signal obtains after being demodulated is corresponding；
Determine the frequency error between described first frequency, demodulation frequency and tranmitting frequency；Wherein, described tranmitting frequency
For transmitting the frequency of the channel of described transmitting signal；
Judge whether the frequency error between described first frequency, demodulation frequency and tranmitting frequency is preset frequently less than first
Rate error；
If it is not, adjust the first load electricity of oscillating circuit corresponding with crystal oscillator in described electronic equipment
Hold, so that the frequency error between described first frequency, demodulation frequency and tranmitting frequency is less than described first predeterminated frequency
Error；Wherein, described crystal oscillator is for providing system sequence for described electronic equipment in described electronic equipment
Parts, described first load capacitance is a part for the total load capacitance of described oscillating circuit.
Optionally, in described storage medium storage and step: be at described electronic equipment and do not carry out voice
During the duty of business and data service, receiving and launch signal, corresponding computer instruction is being performed
Among process, specifically include:
When described electronic equipment is in the duty not carrying out speech business and data service, it is received as described
Electronic equipment provides the paging signal that the communication base station of communication service sends.
Optionally, in described storage medium storage and step: be at described electronic equipment and do not carry out voice
During the duty of business and data service, receiving and launch signal, corresponding computer instruction is being performed
Among process, specifically include:
When described electronic equipment is in the duty not carrying out speech business and data service, by described
Radio-frequency transmitter in electronic equipment receives the described transmitting that the radio frequency sending set in described electronic equipment is launched
Signal.
Optionally, in described storage medium storage and step: by the radio frequency reception in described electronic equipment
Machine receives the described transmitting signal that the radio frequency sending set in described electronic equipment is launched, corresponding computer instruction
Before being executed, also include:
Connect in the RF front-end module in described electronic equipment of radio-frequency transmissions loop and radio frequency reception loop
Logical, so that forming transmitting-receiving loop between described radio-frequency transmissions loop and described radio frequency reception loop；Wherein, institute
Stating radio-frequency transmissions loop is the circuit corresponding with the transmitter in described electronic equipment, described radio frequency reception loop
For the circuit corresponding with the receiver in described electronic equipment；
Described transmitting signal is sent to described radio-frequency transmitter by described radio frequency sending set.
Optionally, in described storage medium storage and step: be at described electronic equipment and do not carry out voice
During the duty of business and data service, receiving and launch signal, corresponding computer instruction is being performed it
Before, also include: during the debugging of described electronic equipment, at a temperature of debugging at M, M is more than 1
Integer, perform following steps respectively:
Receive input signal；
Demodulate described input signal, obtain the second frequency, demodulation frequency；Wherein, described second frequency, demodulation frequency is for by institute
State the frequency that the signal obtained after input signal is demodulated is corresponding；
Judge whether described second frequency, demodulation frequency is less than the second predeterminated frequency by mistake with the frequency error of incoming frequency
Difference；Wherein, described incoming frequency is the frequency of the channel transmitting described input signal；
If it is not, adjust the second load capacitance of described oscillating circuit, so that described second frequency, demodulation frequency and input
The frequency error of frequency is less than described second predeterminated frequency error；Wherein, the value of described second load capacitance is big
In the value of described first load capacitance, the load that described first load capacitance is constituted with described second load capacitance
The equivalent capacity of electric capacity is described total load capacitance.
The above, above example only in order to technical scheme is described in detail, but with
The explanation of upper embodiment is only intended to help to understand method and the core concept thereof of the present invention, and it is right to should not be construed as
The restriction of the present invention.Those skilled in the art, in the technical scope that the invention discloses, can think easily
The change arrived or replacement, all should contain within protection scope of the present invention.
Claims (10)
1. a transmitting frequency calibration method, is applied to electronic equipment, and described method includes:
When described electronic equipment is in the duty not carrying out speech business and data service, receives and launch
Signal；
Demodulate described transmitting signal, obtain the first frequency, demodulation frequency；Wherein, described first frequency, demodulation frequency is and incites somebody to action
The frequency that signal that described transmitting signal obtains after being demodulated is corresponding；
Determine the frequency error between described first frequency, demodulation frequency and tranmitting frequency；Wherein, described tranmitting frequency
For transmitting the frequency of the channel of described transmitting signal；
Judge whether the frequency error between described first frequency, demodulation frequency and tranmitting frequency is preset frequently less than first
Rate error；
If it is not, adjust the first load electricity of oscillating circuit corresponding with crystal oscillator in described electronic equipment
Hold, so that the frequency error between described first frequency, demodulation frequency and tranmitting frequency is less than described first predeterminated frequency
Error；Wherein, described crystal oscillator is for providing system sequence for described electronic equipment in described electronic equipment
Parts, described first load capacitance is a part for the total load capacitance of described oscillating circuit.
2. the method for claim 1, it is characterised in that be at described electronic equipment and do not carry out
During the duty of speech business and data service, receive and launch signal, specifically include:
When described electronic equipment is in the duty not carrying out speech business and data service, it is received as institute
State the paging signal that electronic equipment provides the communication base station of communication service to send.
3. the method for claim 1, it is characterised in that be at described electronic equipment and do not carry out
During the duty of speech business and data service, receive and launch signal, specifically include:
When described electronic equipment is in the duty not carrying out speech business and data service, by described
Radio-frequency transmitter in electronic equipment receives the described transmitting that the radio frequency sending set in described electronic equipment is launched
Signal.
4. method as claimed in claim 3, it is characterised in that by penetrating in described electronic equipment
Before frequency receiver receives the described transmitting signal that the radio frequency sending set in described electronic equipment is launched, described side
Method also includes:
Connect in the RF front-end module in described electronic equipment of radio-frequency transmissions loop and radio frequency reception loop
Logical, so that forming transmitting-receiving loop between described radio-frequency transmissions loop and described radio frequency reception loop；Wherein, institute
Stating radio-frequency transmissions loop is the circuit corresponding with the transmitter in described electronic equipment, described radio frequency reception loop
For the circuit corresponding with the receiver in described electronic equipment；
Described transmitting signal is sent to described radio-frequency transmitter by described radio frequency sending set.
5. the method as described in claim as arbitrary in claim 1-4, it is characterised in that at described electronic equipment
When being in the duty not carrying out speech business and data service, receive before launching signal, described method
Also include:
During the debugging of described electronic equipment, at a temperature of debugging at M, M is the integer more than 1,
Perform following steps respectively:
Receive input signal；
Demodulate described input signal, obtain the second frequency, demodulation frequency；Wherein, described second frequency, demodulation frequency is for by institute
State the frequency that the signal obtained after input signal is demodulated is corresponding；
Judge whether described second frequency, demodulation frequency is less than the second predeterminated frequency by mistake with the frequency error of incoming frequency
Difference；Wherein, described incoming frequency is the frequency of the channel transmitting described input signal；
If it is not, adjust the second load capacitance of described oscillating circuit, so that described second frequency, demodulation frequency and input
The frequency error of frequency is less than described second predeterminated frequency error；Wherein, the value of described second load capacitance is big
In the value of described first load capacitance, the load that described first load capacitance is constituted with described second load capacitance
The equivalent capacity of electric capacity is described total load capacitance.
6. an electronic equipment, including:
First receiver module, for not carrying out the work shape of speech business and data service at described electronic equipment
During state, receive and launch signal；
First demodulation module, is used for demodulating described transmitting signal, obtains the first frequency, demodulation frequency；Wherein, described
First frequency, demodulation frequency be with described transmitting signal is demodulated after frequency corresponding to the signal that obtains；
First determines module, for determining the frequency error between described first frequency, demodulation frequency and tranmitting frequency；
Wherein, described tranmitting frequency is the frequency of the channel transmitting described transmitting signal；
First judge module, for judging that the frequency error between described first frequency, demodulation frequency and tranmitting frequency is
No it is less than the first predeterminated frequency error；
First adjusting module, for if it is not, adjust vibration corresponding with crystal oscillator in described electronic equipment
First load capacitance of circuit, so that the frequency error between described first frequency, demodulation frequency and tranmitting frequency is less than
Described first predeterminated frequency error；Wherein, for described electronics during described crystal oscillator is described electronic equipment
Equipment provides the parts of system sequence, and described first load capacitance is the total load capacitance of described oscillating circuit
A part.
7. electronic equipment as claimed in claim 6, it is characterised in that described first receiver module is concrete
For:
When described electronic equipment is in the duty not carrying out speech business and data service, it is received as institute
State the paging signal that electronic equipment provides the communication base station of communication service to send.
8. electronic equipment as claimed in claim 6, it is characterised in that described first receiver module is concrete
For:
When described electronic equipment is in the duty not carrying out speech business and data service, by described
Radio-frequency transmitter in electronic equipment receives the described transmitting that the radio frequency sending set in described electronic equipment is launched
Signal.
9. electronic equipment as claimed in claim 8, it is characterised in that described electronic equipment also includes even
Logical module and transmitter module:
Described connectivity module, is used at described receiver module specifically for by the radio frequency in described electronic equipment
Before receiver receives the described transmitting signal that the radio frequency sending set in described electronic equipment is launched, radio frequency is sent out
Connect in being emitted back towards road and the radio frequency reception loop RF front-end module in described electronic equipment so that described in penetrate
Frequently transmitting-receiving loop is formed between launching circuit and described radio frequency reception loop；Wherein, described radio-frequency transmissions loop
For the circuit corresponding with the transmitter in described electronic equipment, described radio frequency reception loop is for set with described electronics
The circuit that standby interior receiver is corresponding；
Described transmitter module, for sending described transmitting by described radio frequency sending set to described radio-frequency transmitter
Signal.
10. the electronic equipment as described in claim as arbitrary in claim 6-9, it is characterised in that described electronics sets
Standby the second receiver module, the second demodulation module, the second judge module and the second adjusting module of also including:
Described second receiver module, for during the debugging of described electronic equipment, M debugging temperature
Under degree, receive input signal respectively；
Described second demodulation module, is used for demodulating described input signal, obtains the second frequency, demodulation frequency；Wherein,
Described second frequency, demodulation frequency be described input signal is demodulated after frequency corresponding to the signal that obtains；
Described second judge module, for judging that described second frequency, demodulation frequency with the frequency error of incoming frequency is
No it is less than the second predeterminated frequency error；Wherein, described incoming frequency is to transmit the channel of described input signal
Frequency；
Described second adjusting module, is used for if it is not, adjust the second load capacitance of described oscillating circuit, so that
Described second frequency, demodulation frequency is less than described second predeterminated frequency error with the frequency error of incoming frequency；Wherein,
The value of described second load capacitance is more than the value of described first load capacitance, and described first load capacitance is with described
The equivalent capacity of the load capacitance that the second load capacitance is constituted is described total load capacitance.
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| CN109143031A (en) * | 2018-08-06 | 2019-01-04 | 深圳市鑫研创科技有限公司 | The calibration method of wireless charging full-automatic testing mould group and wireless charging transmitter |
| CN111665392A (en) * | 2018-05-16 | 2020-09-15 | 浙江大学台州研究院 | High-precision frequency statistical calibration method for quartz wafer grinding |
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| CN106160761B (en) | 2019-01-15 |
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