CN106788409A - Frequency modulation method based on phase-locked loop - Google Patents
Frequency modulation method based on phase-locked loop Download PDFInfo
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- CN106788409A CN106788409A CN201611152819.5A CN201611152819A CN106788409A CN 106788409 A CN106788409 A CN 106788409A CN 201611152819 A CN201611152819 A CN 201611152819A CN 106788409 A CN106788409 A CN 106788409A
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- 238000003780 insertion Methods 0.000 claims description 8
- 230000037431 insertion Effects 0.000 claims description 8
- 230000009514 concussion Effects 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims 1
- 238000001228 spectrum Methods 0.000 description 3
- 238000004422 calculation algorithm Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
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- 238000006073 displacement reaction Methods 0.000 description 1
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- 238000004088 simulation Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/099—Details of the phase-locked loop concerning mainly the controlled oscillator of the loop
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- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
The present invention relates to being based on phase-locked loop and being applied to the frequency modulation method of multiband voltage-controlled oscillator (VCO) system, wherein the original frequency for locking the multiband voltage-controlled oscillator (VCO) system is finite number of time.Several voltage-controlled oscillator (VCO)s are selected in multiple voltage-controlled oscillator (VCO)s to come as interpolated point.These interpolated point voltage-controlled oscillator (VCO)s are corrected with predeterminated voltage, and the frequency that is produced with it of numbering of each interpolated point voltage-controlled oscillator (VCO) is stored in internal memory in the way of matching.When system is input into a demand frequency, use multigroup (frequency, voltage-controlled oscillator (VCO) is numbered) match to find out two interpolated point voltage-controlled oscillator (VCO)s closest to demand frequency, and interpolation method is performed, followed the trail of with selecting an appropriate voltage-controlled oscillator (VCO) and lock demand frequency.
Description
Technical field
It is more particularly to a kind of to be used for the voltage-controlled shake of multiband the present invention relates to a kind of frequency modulation method based on phase-locked loop
Swing the method that device adjusts Frequency Synchronization system.
Background technology
In a Frequency Synchronization system for including multiband voltage-controlled oscillator (VCO), before a frequency f0 is followed the trail of, it is necessary to first
Adjustment multiband voltage-controlled oscillator (VCO) can cover frequency f0 to ensure the multiband voltage-controlled oscillator (VCO) being selected, and cause that the frequency is same
Step system lockable frequency f0.
The U.S. Patent No. 6,731,712 delivered by Lin De Strongs et al. discloses a kind of similar Frequency Synchronization system
System, the frequency spectrum of the Frequency Synchronization system is divided into multiple scopes, and the plurality of scope and the Frequency Synchronization system are included
Voltage-controlled oscillator (VCO) is corresponded.When the Frequency Synchronization system is adjusted, each voltage-controlled oscillator (VCO) is found out by the mode of recursive scanning
The upper bound of corresponding frequency spectrum scope and lower bound, the wherein recursive scanning are by the frequency spectrum corresponding to each voltage-controlled oscillator (VCO)
The median of scope finds out the upper bound and the lower bound with towards the corresponding upper bound of each scope with the convergent mode in the direction of lower bound two.Connect
When needing to find out a CF, select the voltage-controlled oscillator (VCO) of the scope for covering CF ownership to follow the trail of and lock
The CF.
Refer to Fig. 1.A kind of flow chart of the frequency modulation method that Fig. 1 is provided by prior art.In step 150, it is necessary to
A given demand frequency f0.Then in step 155, frequency f0 is found out using previously described method of adjustment.In step 170
In, after the voltage-controlled oscillator (VCO) that Frequency Synchronization system is included all is calibrated, Frequency Synchronization system tracks frequency f0.In step
In 180, frequency f0 is persistently locked, until frequency f0 changes in step 190.When frequency f0 occurs in step 190
After change, restarted to perform again by step 150.
Such frequency modulation method is suitable for most voltage-controlled oscillator (VCO) system, because when frequency changes,
Most voltage-controlled oscillator (VCO) system is not too high in the temporal demand of the new demand frequency consumption of locking.But for
For partial voltage-controlled oscillator (VCO) system, the Frequency Synchronization system that it is included often needs just be locked between dozens of microsecond
One demand frequency, therefore, it is impossible to the voltage-controlled oscillator (VCO) method of adjustment provided using prior art more long between locking frequency elbow
In in such voltage-controlled oscillator (VCO) system.
The content of the invention
The present invention provides a kind of frequency modulation method for being used for a voltage-controlled oscillator (VCO) system.The voltage-controlled oscillator (VCO) system includes multigroup
Voltage-controlled oscillator (VCO), and multigroup voltage-controlled oscillator (VCO) each voltage-controlled oscillator (VCO) with a voltage-controlled oscillator (VCO) number.The method is included
By selecting multiple interpolated point voltage-controlled oscillator (VCO)s in multigroup voltage-controlled oscillator (VCO)；The plurality of interpolated point voltage-controlled oscillator (VCO) is calibrated to produce
The multigroup pairing of life, wherein multigroup pairing it is each assemble it is voltage-controlled to the interpolated point comprising the plurality of interpolated point voltage-controlled oscillator (VCO)
Oscillator and a respective frequencies；One demand frequency is provided；Look for this it is multigroup match include two assemble it is right, wherein this two assemble it is right
Each there are two groups of respective frequencies closest to the demand frequency；In two groups of corresponding labels of interpolated point voltage-controlled oscillator (VCO)
The step of carrying out interpolation data, makes the numerical value of interpolation corresponding with difference on the frequency, and selects wherein one from multigroup voltage-controlled oscillator (VCO)
Voltage-controlled oscillator (VCO), for producing the demand frequency；And followed the trail of using the voltage-controlled oscillator (VCO) selected and lock the demand frequency.
Brief description of the drawings
A kind of flow chart of the frequency modulation method that Fig. 1 is provided by prior art.
Fig. 2 is each voltage-controlled oscillator (VCO) and its institute in the Frequency Synchronization system comprising multiband voltage-controlled oscillator (VCO)
The Score Map of the frequency of representative.
Fig. 3 is the flow chart of frequency modulation method provided by the present invention.
Specific embodiment
The Frequency Synchronization system that some voltage-controlled oscillator (VCO) systems are used needs the interior locking one in the very short time specific
Frequency, it is therefore necessary to which interior in the extremely short time uses a frequency modulation method.It is adapted to such voltage-controlled concussion the present invention discloses one kind
The frequency modulation method of device system, the frequency modulation method need not need each voltage-controlled shake of adjustment as the method disclosed by prior art
Swing device, it is not required that scan the frequency range corresponding to each voltage-controlled oscillator (VCO), thus can significantly reduce be locked to need
Ask the time of frequency.For conclusion, although the present invention application interpolation method selected by multiple interpolated point voltage-controlled oscillator (VCO)s for
For one demand frequency and may not be certain to be optimal selection, but the interpolated point voltage-controlled oscillator (VCO) being selected can still produce the demand
Frequency, therefore can not only meet most demand, and quite huge frequency locking time can be saved.It is provided by the present invention
Method include the plurality of interpolated point voltage-controlled oscillator (VCO) of calibration, and the plurality of interpolated point voltage-controlled oscillator (VCO) is only the voltage-controlled oscillator (VCO)
The a subset of all voltage-controlled oscillator (VCO)s that system is included is closed, also multigroup to produce in the internal memory of the voltage-controlled oscillator (VCO) system
The mode of (frequency, voltage-controlled oscillator (VCO) numbering) pairing stores the letter of the corresponding frequency of each interpolated point voltage-controlled oscillator (VCO)
Breath.After the completion of the calibration of the plurality of interpolated point voltage-controlled oscillator (VCO), to two (frequencies, voltage-controlled oscillator (VCO) near demand frequency
Numbering) voltage-controlled oscillator (VCO) is selected in pairing using interpolation method with corresponding frequency, and follow the trail of and lock with the voltage-controlled oscillator (VCO)
The fixed demand frequency.
Refer to Fig. 2.Fig. 2 is each voltage-controlled concussion in the Frequency Synchronization system comprising multiband voltage-controlled oscillator (VCO)
The Score Map of device and the frequency representated by it.As shown in Fig. 2 the longitudinal axis represents the frequency of each voltage-controlled oscillator (VCO), transverse axis represents each
Voltage-controlled oscillator (VCO) is numbered, that is, is represented by all voltage-controlled oscillator (VCO)s of VC00 to VC0n, and the voltage-controlled concussion with smaller numbering
The frequency of device is also smaller.As it is known to those skilled in the art, the frequency response that presents of all voltage-controlled oscillator (VCO)s and nonideal
Linear change, but included to square change being directly proportional of frequency, that is, a conic section, and each voltage-controlled oscillator (VCO)
The centre frequency of frequency range can be all fallen within the conic section in theory.Shown in straight line people as shown in Figure 2, in each voltage-controlled shake
Swing and appoint the frequency that takes two centre frequencies to perform obtained by interpolation method in the centre frequency representated by device and may not be certain essentially equal
In demand frequency, but the accuracy of the frequency still conforms to the actual demand of Frequency Synchronization system, and in Frequency Synchronization system
When following the trail of and lock demand frequency, the method can obtain this close to the frequency of demand frequency with quickish speed.Citing
For, the approximate frequency performed to two centre frequencies representated by voltage-controlled oscillator (VCO) VC03 and VC05 obtained by interpolation method will be compared with pressure
Centre frequency representated by control oscillator VC04 reality is slightly higher, but the approximate frequency is still in the linear of voltage-controlled oscillator (VCO) VC04
In predictable range, that is, voltage-controlled oscillator (VCO) VC04 still can produce the approximate frequency, and the approximate frequency is compared to demand frequently
The accuracy of rate meets the demand of Frequency Synchronization system.From the above, perform interpolation method and obtain the accurate of approximate frequency
Degree be the voltage-controlled oscillator (VCO) number that is included with Frequency Synchronization system and in the Frequency Synchronization system for as interpolated point
Voltage-controlled oscillator (VCO) number it is relevant.Some are for successfully following the trail of and lock the efficiency requirements Frequency Synchronization higher of demand frequency
In system, method provided by the present invention approximate frequency accuracy and obtain producing in the middle of both efficiency of approximate frequency
One optimized effect.
Fig. 3 is referred to, it is the flow chart of frequency modulation method provided by the present invention.The method is by step 300.Step
310 to step 330 describes the paragraph after in detail.The explanation of " repeating II times " shown in Fig. 3 not represents sequentially heavy
It is common n times to step 330 that step 310 is performed again, but expression all is calibrated to for the pressure as insertion point for each
For control oscillator, all there is the step of a correspondence to need to perform, that is, step 310 to step 330 represents n and corresponds in different
The step of inserting point voltage-controlled oscillator (VCO).For example, if there is three interpolated point voltage-controlled oscillator (VCO)s to be calibrated, step 310 to 330 will be wrapped
Containing individually corresponding to this three the three of interpolated point voltage-controlled oscillator (VCO) steps, and each step Exactly-once.Similarly, if having eight
Individual interpolated point voltage-controlled oscillator (VCO) is calibrated, and step 310 to 330 is by comprising individually corresponding to eight interpolated point voltage-controlled oscillator (VCO)s
Eight steps, and each step Exactly-once.
When these interpolated point voltage-controlled oscillator (VCO)s be calibrated, in step 350, Frequency Synchronization system is ready for input
One demand frequency fX.In step 360, (frequency, voltage-controlled oscillator (VCO) numbering) pairing that each has been stored is used for performing interpolation method
To find out the voltage-controlled oscillator (VCO) for being best suitable for producing demand frequency.A kind of interpolation method formula is used for obtaining one closest to demand frequency
Approximate frequency, and produce the approximate frequency voltage-controlled oscillator (VCO) number be expressed as ((VC00* (C1-Cd)+(vc01* (Cd-
C0)/(C1-C0))), it is closest and voltage-controlled less than the interpolated point of the calibrated mistake of the demand frequency that wherein VC00 represents a frequency
Oscillator, VC01 represent a frequency closest to and calibrated mistake more than the demand frequency interpolated point voltage-controlled oscillator (VCO), Cd is
The demand frequency, C0 is the frequency produced by interpolated point voltage-controlled oscillator (VCO) VC00, and C1 is interpolated point voltage-controlled oscillator (VCO) VC01 institutes
The frequency of generation.For example, if demand frequency is 50, and given two (frequency, voltage-controlled oscillator (VCO) numbering) pairing (32,
VC023) and (64, VC051), the formula according to more than will produce the voltage-controlled oscillator (VCO) numbering of approximate frequency to represent such as (23* (64-
50)+51* (50-32)/(64-32)), thus can obtain its approximate frequency closest to demand frequency voltage-controlled oscillator (VCO) numbering be
38.75, then the consideration in visual design by 38.75 it is unconditional cast out be 38 or be rounded to 39.
After being selected out during interpolation method of the appropriate voltage-controlled oscillator (VCO) more than, Frequency Synchronization system is in step
Demand frequency fX is followed the trail of in 370, demand frequency fX is then locked in step 380.The demand frequency is opened from step 380
Begin lasting locked, until can just produce change in step 390.
Referring to the part of the step 310 shown in Fig. 3 to 330, the relevant above-described calibration voltage-controlled shake of interpolated point
The part for swinging device will explain in detail in the following examples.However, presently disclosed scope and content do not receive following institute
The limitation of the content that the example stated and the example are included.That is,:The appropriate voltage-controlled concussion of calibrated interpolated point of other selections
The method of device, other are related to the other frequency ranges of property of interpolated point, or are the use of other systems and perform this hair
Bright disclosed method, all without departing from presently disclosed scope.
In this example, it is assumed that the frequency locking time of Frequency Synchronization system requirements starting must be shorter than 500 microseconds.By
Come stable simulation circuit and stabilization phase-locked loop in must again separate some times in the middle of this 500 microsecond, thus it is originally predetermined
500 microseconds can only retain about 400 microseconds to calibrate.If the circuit for being used needs at most 35 microseconds to come school with algorithm
The frequency of an accurate interpolated point voltage-controlled oscillator (VCO), then Frequency Synchronization system can process at most 400/35 about 11 voltage-controlled concussion of interpolated point
The frequency of device.Assuming that frequency range is about 1875 megahertzs to 1933 megahertzs, and frequency is spaced about 300 kilo hertzs.If desired
11 frequencies of interpolated point voltage-controlled oscillator (VCO) of adjustment, then the frequency spacing of each interpolated point voltage-controlled oscillator (VCO) is i.e. about 5.8 million
It is conspicuous.In order to simplify narration, by the frequency spacing of each insertion point voltage-controlled oscillator (VCO) by 5.8 megahertz carries to 6 megahertzs, Yi Jiyue
It is 20 times of 300 kilo hertzs of frequency spacing.The frequency spacing-visible of this 6 megahertz is the linear variation of each voltage-controlled oscillator (VCO).
For internal calculation, the demand frequency of a unit is about 150 kilo hertzs, thus can be used about 40 it is calibrated
Frequency interval simplifies above-mentioned interpolation method.However, it is more divided by the time of 40 division consumption, for the demand of hardware space
Also it is larger, used because unsuitable.If in fact, the displacement of usable cylinder list is completed into required as divisor using 2 power
Division, while also without taking any hardware space.The method of the present invention can be total in 150 kilo hertzs of frequency range
There are 32 or 64 frequency gaps of calibrated mistake.If selection there are 32 frequency gaps of calibrated mistake, 13 interpolations are had
The frequency of point voltage-controlled oscillator (VCO) needs to be calibrated, and can only calibrate 11 limitations of the frequency of voltage-controlled oscillator (VCO) by therefore exceeding.
If selection has 64 frequency gaps of calibrated mistake, having 7 frequencies of interpolated point voltage-controlled oscillator (VCO) needs to be calibrated, and frequency
The size in rate gap is 9.6 megahertzs, therefore still in the range of linearity of interpolated point voltage-controlled oscillator (VCO).
When the number of the voltage-controlled oscillator (VCO) of calibrated mistake is known (being 7 in above-mentioned example), then can be easily
Select calibrated voltage-controlled oscillator (VCO), and may be such that calibrated voltage-controlled oscillator (VCO) that these the are selected quilt in Frequency Synchronization system
Appropriate separates.These predetermined voltages of calibrated voltage-controlled oscillator (VCO) one being selected then are provided, it is real of the invention one
The value of the predetermined voltage in example is applied for 1.4 volts, but the value of the predetermined voltage can be adjusted optionally again.The predetermined voltage
Value is certain value during each interpolated point voltage-controlled oscillator (VCO) is calibrated with time-consuming.For each calibrated interpolated point
For voltage-controlled oscillator (VCO), produced frequency is combined into one with the numbering of each interpolated point voltage-controlled oscillator (VCO) under the predetermined voltage
(frequency, voltage-controlled oscillator (VCO) numbering) is matched and is stored in internal memory, and other are also used to storage such as the storage method of the class of inquiry table
Each (frequency, voltage-controlled oscillator (VCO) numbering) pairing is deposited, at this time point, the process for calibrating voltage-controlled oscillator (VCO) has been completed, and frequency
Rate synchronization system has been ready for performing step 350 and has been input into a demand frequency.
After the demand frequency is transfused to the Frequency Synchronization system, two (frequencies, voltage-controlled shake closest to the demand frequency
Swing device numbering) for performing interpolation method to obtain a voltage-controlled oscillator (VCO) numbering estimated, the voltage-controlled oscillator (VCO) that this is estimated is simultaneously for pairing
It then be used to produce the demand frequency.It is specifically noted that each voltage-controlled oscillator (VCO) in Frequency Synchronization system is all connected to one
Switch, therefore only can simultaneously have a voltage-controlled oscillator (VCO) being selected for producing demand frequency, and its at arbitrary time point
Its unselected voltage-controlled oscillator (VCO) is temporarily not connected with Frequency Synchronization system.
The frequency modulation method of present disclosure one, the method is simultaneously suitable for the quite limited multifrequency pressure of original frequency locking number of times
Control oscillator system.Demand frequency is produced in order to the voltage-controlled oscillator (VCO) being best suitable for can be found within the most short time,
Multiple voltage-controlled oscillator (VCO)s are selected in Frequency Synchronization system in advance with as interpolated point.The multiple interpolated point voltage-controlled oscillator (VCO)s being selected
Then calibrated with a predetermined voltage, and frequency produced by the plurality of interpolated point voltage-controlled oscillator (VCO) will be along with the plurality of interpolation
The numbering of point voltage-controlled oscillator (VCO) is stored in internal memory in the form of (frequency, voltage-controlled oscillator (VCO) numbering) pairing, each (frequency, pressure
Control oscillator numbering) match corresponding to single interpolated point voltage-controlled oscillator (VCO).When Frequency Synchronization system is input into a demand frequency, by
Matched and performed interpolation method by selecting two (frequencies, voltage-controlled oscillator (VCO) numbering) closest to the demand frequency and find out one most
Appropriate voltage-controlled oscillator (VCO) is producing the demand frequency.The method of the present invention need not be directed to each pressure of Frequency Synchronization system
Oscillator is controlled to calibrate, and the method for the present invention need not also check each voltage-controlled oscillator (VCO) pair in the way of recurrence search
The frequency range answered, therefore the method for the present invention saves many unnecessary times, and obtain a preferably original frequency lock
Determine number of times.The foregoing is only presently preferred embodiments of the present invention, the impartial change that all claims under this invention are done with repair
Decorations, should all belong to covering scope of the invention.
Claims (9)
1. a kind of frequency modulation method for being used for a voltage-controlled oscillator (VCO) system, the voltage-controlled oscillator (VCO) system includes multigroup voltage-controlled oscillator (VCO),
And each voltage-controlled oscillator (VCO) of multigroup voltage-controlled oscillator (VCO) is numbered with a voltage-controlled oscillator (VCO), the method is included：
By selecting multiple interpolated point voltage-controlled oscillator (VCO)s in multigroup voltage-controlled oscillator (VCO)；
To the calibration of the plurality of interpolated point voltage-controlled oscillator (VCO) to produce multigroup pairing, wherein multigroup pairing it is each assemble to comprising
One interpolated point voltage-controlled oscillator (VCO) of the plurality of interpolated point voltage-controlled oscillator (VCO) and a respective frequencies；
One demand frequency is provided；
Look for this it is multigroup match two for including and assemble right, wherein this two is assembled to each having closest to two groups of the demand frequency
Respective frequencies；
The step of insertion numerical value being carried out in two groups of corresponding labels of interpolated point voltage-controlled oscillator (VCO), from multigroup voltage-controlled concussion
A wherein voltage-controlled oscillator (VCO) is selected in device, for producing the demand frequency；And followed the trail of and lock using the voltage-controlled oscillator (VCO) selected
The fixed demand frequency.
2. the method for claim 1, wherein to the calibration of the plurality of interpolated point voltage-controlled oscillator (VCO) producing multigroup pairing bag
Containing calibrating many interpolated point voltage-controlled oscillator (VCO)s using identical predetermined voltage to each interpolated point voltage-controlled oscillator (VCO).
3. method as claimed in claim 2, the wherein value of the predetermined voltage are 1.4 volts.
4. method as claimed in claim 2, wherein multigroup pairing are stored in the inquiry table in internal memory.
5. method as claimed in claim 2, each voltage-controlled oscillator (VCO) of wherein multigroup voltage-controlled oscillator (VCO) is corresponding with one
Switch is electrically connected to the system, and when being followed the trail of using corresponding switch and locking the demand frequency, it is all not to be selected
Voltage-controlled oscillator (VCO) be not turned on the electrical connection of the system.
6. method as claimed in claim 5, wherein choosing the voltage-controlled oscillator (VCO) for being used for producing the demand frequency according to a formula
((VC00* (C1-Cd)+(vc01* (Cd-C0)/(C1-C0))), VC00 be comprising one closest to but less than the demand frequency
Insertion point voltage-controlled oscillator (VCO), VC001 be comprising one closest to but more than the insertion point voltage-controlled oscillator (VCO) of the demand frequency, Cd is
The demand frequency, C0 is the voltage-controlled oscillator (VCO) numbering produced by insertion point voltage-controlled oscillator (VCO) VC00, and is the voltage-controlled shake in C1 insertion points
Swing the voltage-controlled oscillator (VCO) numbering produced by device VC01.
7. the automatic frequency adjustment system that a kind of multiband voltage-controlled oscillator (VCO) system is used, comprising：
One selecting device, with come by selecting multiple interpolated point voltage-controlled oscillator (VCO)s in multigroup voltage-controlled oscillator (VCO), wherein this is multigroup voltage-controlled
Each voltage-controlled oscillator (VCO) of oscillator is numbered with a voltage-controlled oscillator (VCO)；
One calibrating installation, for calibrating the plurality of interpolated point voltage-controlled oscillator (VCO), and produce multigroup pairing, wherein multigroup pairing
It is each to assemble to comprising an interpolated point voltage-controlled oscillator (VCO) and a respective frequencies；And
One finding device, for looking for multigroup pairing two assemble centering with two groups of correspondence frequencies closest to a demand frequency
Rate, and insertion numerical value is carried out in two groups of corresponding labels of interpolated point voltage-controlled oscillator (VCO), from multigroup voltage-controlled oscillator (VCO)
A wherein voltage-controlled oscillator (VCO) is selected, the wherein voltage-controlled oscillator (VCO) is used for producing the demand frequency.
8. system as claimed in claim 7, wherein multigroup pairing are stored in the inquiry table in internal memory.
9. system as claimed in claim 7, each voltage-controlled oscillator (VCO) of this group of voltage-controlled oscillator (VCO) is with a corresponding switch
It is electrically connected to the system.
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| CN201611152819.5A CN106788409A (en) | 2016-12-14 | 2016-12-14 | Frequency modulation method based on phase-locked loop |
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| CN201611152819.5A CN106788409A (en) | 2016-12-14 | 2016-12-14 | Frequency modulation method based on phase-locked loop |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1630197A (en) * | 2003-12-19 | 2005-06-22 | 络达科技股份有限公司 | Method for automatically correcting frequency range of phase-locked loop and related phase-locked loop |
| CN1983818A (en) * | 2005-12-12 | 2007-06-20 | 络达科技股份有限公司 | Frequency Adjustment Method Applied to Phase Locked Loop |
-
2016
- 2016-12-14 CN CN201611152819.5A patent/CN106788409A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1630197A (en) * | 2003-12-19 | 2005-06-22 | 络达科技股份有限公司 | Method for automatically correcting frequency range of phase-locked loop and related phase-locked loop |
| CN1983818A (en) * | 2005-12-12 | 2007-06-20 | 络达科技股份有限公司 | Frequency Adjustment Method Applied to Phase Locked Loop |
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Application publication date: 20170531 |