CN102938633B - The control method of a kind of crystal oscillator interference and device - Google Patents
The control method of a kind of crystal oscillator interference and device Download PDFInfo
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- CN102938633B CN102938633B CN201210409943.0A CN201210409943A CN102938633B CN 102938633 B CN102938633 B CN 102938633B CN 201210409943 A CN201210409943 A CN 201210409943A CN 102938633 B CN102938633 B CN 102938633B
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Abstract
The embodiment of the invention discloses the control method of a kind of crystal oscillator interference, including: when crystal oscillator interference signal being detected, obtain the frequency being disturbed；Judge the frequency of the user received input be whether described in the frequency that is disturbed；If it is, adjust the driving electric current of crystal oscillator according to the software parameter pre-saved.The embodiment of the invention also discloses the control device of a kind of crystal oscillator interference.Use the present invention, by the way of software controls, solve crystal oscillator frequency multiplication interference problem, it is to avoid the limitation rectified and improved by hardware point of view, improve reliability and the exploitativeness of crystal oscillator driving force that crystal oscillator uses, reduce hardware development cost to a certain extent, shorten the hardware development cycle.
Description
Technical field
The present invention relates to digital TV field, particularly relate to control method and the device of the interference of a kind of crystal oscillator.
Background technology
When electric current flows through load, the most linear with added voltage, form non-sinusoidal current, then electricity
Having harmonic wave to produce in road, harmonic wave refers to the electricity of the integral multiple that frequency is first-harmonic contained in electric current.Crystal oscillator,
Full name is crystal oscillator (English for Crystal Oscillators), when being commonly used to the benchmark that offer system is run
Clock.The reference clock of crystal oscillator output is sinusoidal wave, therefore crystal oscillator can run into harmonic wave interference problem to a great extent.
Common crystal oscillator harmonic wave interference is 3 times of crystal oscillator, 5 times, 7 overtones bands.Owing to crystal oscillator disturbs just for part
Regular frequency, without impacting whole frequency range, therefore works as harmonic frequency and the effective frequency of crystal oscillator
Time identical, form harmonic wave interference.
Existing major part Set Top Box all can run into crystal oscillator frequency multiplication interference problem, existing skill when index debugging is tested
Art is processed by the amendment on hardware, such as, add filter circuit, power supply on crystal oscillator/clock circuit power line
Ripple processes；Crystal oscillator/clock circuit is close proximity to by driving chip, and Clock layout(clock circuit connects up)
Cabling is the shortest, it is to avoid via cabling, the earthing of casing of crystal oscillator；Sensitive signal source, not close to crystal oscillator；Adjust
Joint starting of oscillation electric capacity, makes crystal oscillator frequency multiplication retrodeviate from interference frequency etc..The shortcoming of prior art: the design cycle increases；
Process on power supply, the most uncontrollable, PCB(Printed circuit board, printed circuit board (PCB), again
Claim printed circuit board) area increase, Material Cost increased to a certain extent；Connected up by Layout()
Make bigger；Regulation starting of oscillation electric capacity, easily causes frequency deviation.
Summary of the invention
Embodiment of the present invention technical problem to be solved is, it is provided that a kind of crystal oscillator interference control method and
Device.By the way of software controls, solve crystal oscillator frequency multiplication interference problem, can avoid by hardware point of view whole
The limitation changed, improves reliability and the exploitativeness of crystal oscillator driving force that crystal oscillator uses.
In order to solve above-mentioned technical problem, embodiments provide the control method of a kind of crystal oscillator interference,
Including:
When crystal oscillator interference signal being detected, obtain the frequency being disturbed；
Judge the frequency of the user received input be whether described in the frequency that is disturbed；
If it is, adjust the driving electric current of crystal oscillator according to the software parameter pre-saved.
Wherein, described in detect crystal oscillator interference signal after, described method also includes:
Change described software parameter, until the sensitivity parameter of tuner meets default sensitivity parameter threshold value；
The sensitivity parameter making tuner described in preservation meets the software parameter of default sensitivity parameter threshold value.
Wherein, described software parameter is the state parameter of control circuit of crystal oscillator.Described control circuit is by least
One gate circuit composes in parallel, and the state parameter of the control circuit of described crystal oscillator includes at least one electricity described
The state being turned on and off on road.
Wherein, also include after the driving electric current of the software parameter adjustment crystal oscillator that described basis pre-sets:
The frequency deviation of regulation crystal oscillator, carries out frequency compensation.
Correspondingly, the embodiment of the present invention additionally provides the control device of a kind of crystal oscillator interference, including:
Acquisition module, when crystal oscillator interference signal being detected, for obtaining the frequency being disturbed；
Judge module, for judge the frequency of the user received input be whether described in the frequency that is disturbed；
Drive current adjusting module, if the judged result of described judge module is yes, for according to protecting in advance
The software parameter deposited adjusts the driving electric current of crystal oscillator.
Wherein, described device also includes:
Software parameter change module, is used for changing described software parameter, until the sensitivity parameter of tuner is full
The sensitivity parameter threshold value that foot is preset；
Software parameter preserves module, makes described in preserve the sensitivity parameter of tuner meet default sensitive
The software parameter of degree parameter threshold.
Wherein, described software parameter is the state parameter of control circuit of crystal oscillator.Described control circuit is by least
One gate circuit composes in parallel, and the state parameter of the control circuit of described crystal oscillator includes at least one electricity described
The state being turned on and off on road.
Wherein, described device also includes:
Frequency compensation module, for regulating the frequency deviation of crystal oscillator, carries out frequency compensation.
Implement the embodiment of the present invention, have the advantages that by the way of software controls and solve crystal oscillator times
Frequently interference problem, it is to avoid by hardware such as the limitation of the rectifications such as amendment pcb board, improve crystal oscillator and make
Reliability and the exploitativeness of crystal oscillator driving force, reduce hardware development cost to a certain extent,
Shorten the hardware development cycle.
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 some embodiments of the present invention, for those of ordinary skill in the art, do not paying
On the premise of going out creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the example structure schematic diagram controlling device of a kind of crystal oscillator interference in the embodiment of the present invention；
Fig. 2 is the control method schematic flow sheet of a kind of crystal oscillator interference in the embodiment of the present invention；
Fig. 3 is the control method schematic flow sheet of another kind of crystal oscillator interference in the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clearly
Chu, be fully described by, it is clear that described embodiment be only a part of embodiment of the present invention rather than
Whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creation
The every other embodiment obtained under property work premise, broadly falls into the scope of protection of the invention.
Fig. 1 is the example structure schematic diagram controlling device of a kind of crystal oscillator interference in the embodiment of the present invention, this
The device that controls of invention crystal oscillator interference can be implemented in the index tune such as DTV STB, crystal oscillator radiation etc.
In examination test.As a example by DTV STB, now specifically describe the control device of crystal oscillator interference.Such as Fig. 1
The control device of shown a kind of crystal oscillator of the present embodiment interference at least can include acquisition module 110, judge module
120 and drive current adjusting module 130, wherein:
Acquisition module 110, when crystal oscillator interference signal being detected, for obtaining the frequency being disturbed.Implement
In, frequency refers in a certain bandwidth, the mid frequency of its useful signal, such as: when channel width is 8M
Time, the mid frequency 80MHz corresponding to useful frequency range 76MHz to 84MHz, 80MHz now are i.e.
It it is a frequency.Concrete, the detection process of crystal oscillator interference signal is: survey with SFU(digital-TV channel
Examination instrument) detection Tuner(tuner) sensitivity, if some frequency low level threshold value deviation not
Up to standard, then by the intermediate-freuqncy signal of audiofrequency spectrometer detection Tuner, the interference signal that this frequency be can be observed occurs, will
The value of the ground capacity that shell of crystal oscillator ground connection or increasing crystal oscillator pin access, if the sensitivity of interference frequency has
The biggest improvement, then can determine that this interference is the interference caused by crystal oscillator, if this frequency is 80MHz, the most finally
May determine that the low level of the 80MHz that 5 subharmonic of the 16MHz crystal oscillator of Tuner interfere with Tuner is sensitive
Degree, detects that crystal oscillator disturbs signal, obtains the 80MHz that frequency is Tuner being disturbed.
Judge module 120, it is judged that whether the frequency of the user's input received is the frequency being disturbed.Concrete real
In Xian, during set top box testing, during search channel, there will be the prompting interface of frequency point setting, Yong Hu
This interface input frequency, it is judged that module 120 judges whether the frequency of the user received input is be disturbed
Frequency, such as user input frequency 115MHz, and the frequency being disturbed is 131MHz etc..
Drive current adjusting module 130, if it is determined that the judged result of module 120 is yes, for according in advance
The software parameter preserved adjusts the driving electric current of crystal oscillator.In implementing, call the software parameter pre-saved
Corresponding subprogram, after running this subprogram and then adjust the driving electric current of crystal oscillator.Wherein, software parameter
For the state parameter of the control circuit of crystal oscillator, control circuit is composed in parallel by least one gate circuit, crystal oscillator
The state parameter of control circuit includes the state being turned on and off of at least one gate circuit.
Concrete, control circuit is mainly buffered by Buffer() circuit constitutes, and control circuit is by least one door
Circuit in parallel form, the switch of gate circuit is under software control, the state parameter of the control circuit of crystal oscillator include to
The state being turned on and off of a few gate circuit, the corresponding different driving electric current of different software parameter, from
And different driving forces is provided.When the state parameter of gate circuit is set to 0, represent that gate circuit is opened,
This road provides and drives, and when the state parameter of gate circuit is set to 1, represents that gate circuit turns off, this Lu Buti
For driving, the electric current summation that the most total gate circuit driving electric current to be equal to 0 state that is in provides, by closing
Close gate circuit so that drive electric current summation to reduce, thus adjust the driving electric current of crystal oscillator so that driving of crystal oscillator
Kinetic force reduces, and such as, control circuit includes 4 gate circuits, respectively gate circuit 1, gate circuit 2, door
Circuit 3 and gate circuit 4, the state parameter arranging gate circuit 1 and gate circuit 2 is 0, arranges gate circuit 3 He
The state parameter of gate circuit 4 is 1, and the most total driving electric current is gate circuit 1 and gate circuit 2 place branch road
Electric current summation I provided1, total current sum I of offer when 4 gate circuits are fully open0, then I1<I0。
Further alternative, device in the present embodiment can also include software parameter change module 140 and soft
Part parameter preserves module 150, wherein:
Software parameter change module 140, is used for changing software parameter, until the sensitivity parameter of tuner meets
The sensitivity parameter threshold value preset.In implementing, the finger that sensitivity parameter threshold value is default setting preset
Mark test parameter, e.g., less than 40dBuV, more than 90dBuV etc..Tuner (Tuner) is used to receive
Outdoor tuner (satellite system), coaxial cable (cable television), exterior aerial (ground digital) input
RF(Radio Frequency, radio frequency) signal, and this signal is amplified, filters and double conversion,
Convert thereof into the second intermediate-freuqncy signal.The height of sensitivity (Sensitivity) represents that tuner receives light current ripple
The ability of signal, the height of the level value i.e. received, the radio station number that highly sensitive tuner is received is than spirit
The radio station that the tuner that sensitivity is low is received is many and the quality of reception good.The definition of sensitivity is in a certain signal to noise ratio
Under conditions of the lowest electric field strength that can receive represent.When output level and signal to noise ratio one timing, adjust
The minimum input voltage of humorous device input, is sensibility in practice, and this value is the least, and sensitivity is the highest.Software parameter
For the state parameter of the control circuit of crystal oscillator, control circuit is composed in parallel by least one gate circuit, crystal oscillator
The state parameter of control circuit includes the state being turned on and off of at least one gate circuit, is carrying out software tune
During examination, need to repeatedly change software parameter, until the sensitivity parameter of tuner meets default sensitivity parameter
Threshold value.
Software parameter preserves module 150, makes the sensitivity parameter of tuner meet default sensitivity for preserving
The software parameter of parameter threshold.In implementing, the sensitivity parameter making tuner is met default sensitive
The software parameter of degree parameter threshold is labeled as end-state, and preserves, then be set as finally revising by this parameter
Parameter.
Further alternative, the device in the present embodiment can also include:
Frequency compensation module 160, for regulating the frequency deviation of crystal oscillator, carries out frequency compensation.Adjust crystal oscillator and drive electricity
Stream so that after the driving electric current of crystal oscillator reduces, corresponding output also reduces, output=electric current × electricity
Pressure, accesses two ceramic disc capacitor ground connection at the two pins of crystal oscillator and can cut down the harmonic wave impact on circuit stability,
These two ceramic disc capacitors are starting of oscillation electric capacity, and the starting of oscillation capacitance calculation method of docking crystal is:
C1=C2=2(CL-Cstray), CstrayIt is the stray capacitance in circuit, generally 2pF ~ 5pF, CLFor load
Capacitance, when closing the driving of gate circuit branch road, the load capacitance number of its parallel connection reduces, and the most total is negative
Load capacitance reduces, and total capacitance reduces its impedance matching value and increases, in order to avoid turning off part gate circuit
The impact brought to load capacitance and coupling impedance, needs it is carried out frequency compensation, it is ensured that phaselocked loop exports
Voltage normal.The effect of phaselocked loop is detection input signal and the phase contrast of output signal, and will detect number
Phase signal be changed into voltage signal output, this signal forms voltage controlled oscillator after low-pass filtering
Control voltage, implement to control to the frequency of oscillator output signal.Frequency compensated purpose be reduce clock and
Phase contrast, makes input and output Frequency Synchronization, the frequency deviation of regulation crystal oscillator, makes frequency deviation reduce, it is ensured that phaselocked loop is defeated
The voltage gone out is normal.
Fig. 2 is the control method schematic flow sheet of a kind of crystal oscillator interference in the embodiment of the present invention, in the present embodiment
Method flow can the device in foregoing embodiments realize, the control method of crystal oscillator interference as shown in the figure
At least include:
Step S210, when crystal oscillator interference signal being detected, obtains the frequency being disturbed.In implementing, frequently
Point refers in a certain bandwidth, and the mid frequency of its useful signal such as: when channel width is 8M, has
With the mid frequency 80MHz corresponding to frequency range 76MHz to 84MHz, 80MHz now is one
Frequency.Concrete, the detection process of crystal oscillator interference signal is: with SFU(digital-TV channel tester)
Detection Tuner(tuner) sensitivity, if the low level threshold value deviation at some frequency is the most up to standard,
Then by the intermediate-freuqncy signal of audiofrequency spectrometer detection Tuner, the interference signal that this frequency be can be observed occurs, by outside crystal oscillator
The value of the ground capacity that shell ground connection or increasing crystal oscillator pin access, if the sensitivity of interference frequency has changes the most greatly
Kind, then can determine that this interference is the interference caused by crystal oscillator, if this frequency is 80MHz, then may finally be true
5 subharmonic of the 16MHz crystal oscillator determining Tuner interfere with the low level sensitivity of the 80MHz of Tuner, inspection
Measure crystal oscillator interference signal, obtain the 80MHz that frequency is Tuner being disturbed.
Step S220, it is judged that whether the frequency of the user's input received is the frequency being disturbed.Implement
In, during set top box testing, during search channel, there will be the prompting interface of frequency point setting, user is at this
Interface input frequency, it is judged that whether the frequency of the user's input received is the frequency being disturbed, such as user
Input frequency 115MHz, the frequency being disturbed is 131MHz etc..
Step S230, if it is, adjust the driving electric current of crystal oscillator according to the software parameter pre-saved.Specifically
In realization, call the subprogram corresponding to the software parameter pre-saved, after running this subprogram so that adjust
The driving electric current of crystal oscillator.Wherein, software parameter is the state parameter of the control circuit of crystal oscillator, control circuit by
At least one gate circuit composes in parallel, and the state parameter of the control circuit of crystal oscillator includes at least one gate circuit
The state being turned on and off.
Concrete, control circuit is mainly made up of Buffer circuit, and control circuit is by least one gate circuit also
Joint group becomes, and the switch of gate circuit is under software control, and the state parameter of the control circuit of crystal oscillator includes at least one
The state being turned on and off of gate circuit, the corresponding different driving electric current of different software parameter, thus provide
Different driving forces.When the state parameter of gate circuit is set to 0, representing that gate circuit is opened, this road carries
For driving, when the state parameter of gate circuit is set to 1, representing that gate circuit turns off, this road does not provide driving,
The electric current summation that the most total gate circuit driving electric current to be equal to 0 state that is in provides, by closing gate circuit,
Make to drive electric current summation to reduce, thus adjust the driving electric current of crystal oscillator so that the driving force of crystal oscillator reduces,
Such as, control circuit includes 4 gate circuits, respectively gate circuit 1, gate circuit 2, gate circuit 3 and door electricity
Road 4, the state parameter arranging gate circuit 1 and gate circuit 2 is 0, arranges gate circuit 3 and the shape of gate circuit 4
State parameter is 1, and the most total electric current driving electric current to provide for gate circuit 1 and gate circuit 2 place branch road is total
And I1, total current sum I of offer when 4 gate circuits are fully open0, then I1<I0。
Step S240, if it does not, perform normal initial program.
Further alternative, if Fig. 3 is the control method flow process of another kind of crystal oscillator interference in the embodiment of the present invention
Schematic diagram, then the control method of this invention crystal oscillator interference at least can also include:
Step S310, when crystal oscillator interference signal being detected, obtains the frequency being disturbed.Wherein, step S310
May refer to step S210 of embodiment illustrated in fig. 2, be not repeated herein.
Step S320, when crystal oscillator interference signal being detected, changes software parameter, until the sensitivity of tuner
Parameter meets default sensitivity parameter threshold value.In implementing, the sensitivity parameter threshold value preset is acquiescence
The index test parameter set, e.g., less than 40dBuV, more than 90dBuV etc..Tuner (Tuner) is
For receiving chamber outer tuner (satellite system), coaxial cable (cable television), exterior aerial (ground number
Word) the RF(Radio Frequency that inputs, radio frequency) signal, and this signal is amplified, filter and
Double conversion, converts thereof into the second intermediate-freuqncy signal.The height of sensitivity (Sensitivity) represents tuner
Receiving the ability of weak electric wave signal, the height of the level value i.e. received, highly sensitive tuner is received
The radio station that the tuner that radio station number specific sensitivity is low is received is many and the quality of reception good.The definition of sensitivity be
The lowest electric field strength that can receive under conditions of a certain signal to noise ratio represents.When output level and signal to noise ratio
One timing, the minimum input voltage of tuner input, it is sensibility in practice, this value is the least, and sensitivity is the highest.
Software parameter is the state parameter of the control circuit of crystal oscillator, and control circuit is composed in parallel by least one gate circuit,
The state parameter of the control circuit of crystal oscillator includes the state being turned on and off of at least one gate circuit, is carrying out
During software debugging, need to repeatedly change software parameter, until the sensitivity parameter of tuner meets default sensitive
Degree parameter threshold.
Step S330, preserves the software making the sensitivity parameter of tuner meet default sensitivity parameter threshold value
Parameter.In implementing, the sensitivity parameter making tuner is met the soft of default sensitivity parameter threshold value
Part parameter tags are end-state, and preserve, then be set as finally revising parameter by this parameter.
Step S340, it is judged that whether the frequency of the user's input received is the frequency being disturbed.
Step S350, if it is, adjust the driving electric current of crystal oscillator according to the software parameter pre-saved.
Wherein, step S340 and step S350, may refer to step S220 and the step of embodiment illustrated in fig. 2
Rapid S230, is not repeated herein.
Step S360, if it does not, perform normal initial program.
Step S370, the frequency deviation of regulation crystal oscillator, carry out frequency compensation.Adjust crystal oscillator and drive electric current so that be brilliant
After the driving electric current shaken reduces, corresponding output also reduces, and output=electric current × voltage, at crystal oscillator
Two pins at access two ceramic disc capacitor ground connection can cut down the harmonic wave impact on circuit stability, these two porcelain
Chip capacitor is starting of oscillation electric capacity, and the starting of oscillation capacitance calculation method of docking crystal is: C1=C2=2(CL-Cstray), Cstray
It is the stray capacitance in circuit, generally 2pF ~ 5pF, CLFor load capacitance value, when closing gate circuit branch road
Driving time, the load capacitance number of its parallel connection reduces, and the most total load capacitance value reduces, total capacitance
Reduce its impedance matching value to increase, bring to load capacitance and coupling impedance in order to avoid turning off part gate circuit
Impact, need it is carried out frequency compensation, it is ensured that phaselocked loop output voltage normal.The effect of phaselocked loop
It is detection input signal and the phase contrast of output signal, and the phase signal of detection number is changed into voltage letter
Number output, this signal forms the control voltage of voltage controlled oscillator after low-pass filtering, to agitator output letter
Number frequency implement control.Frequency compensated purpose is to reduce clock and phase contrast, makes input and output frequency same
Step, the frequency deviation of regulation crystal oscillator, make frequency deviation reduce, it is ensured that the voltage of phaselocked loop output is normal.
One of ordinary skill in the art will appreciate that all or part of flow process realizing in above-described embodiment method,
Can be by computer program and complete to instruct relevant hardware, program can be stored in a computer-readable
Taking in storage medium, this program is upon execution, it may include such as the flow process of the embodiment of above-mentioned each method.Wherein,
Storage medium can be magnetic disc, CD, read-only store-memory body (Read-Only Memory, ROM) or with
Machine store-memory body (Random Access Memory, RAM) etc..
Above disclosed be only present pre-ferred embodiments, certainly can not with this limit the present invention it
Interest field, the equivalent variations therefore made according to the claims in the present invention, still belong to the scope that the present invention is contained.
Claims (8)
1. the control method of a crystal oscillator interference, it is characterised in that described method includes:
When crystal oscillator interference signal being detected, obtain the frequency being disturbed；
Judge the frequency of the user received input be whether described in the frequency that is disturbed；
If it is, adjust the driving electric current of crystal oscillator according to the software parameter pre-saved；
Wherein, described in detect crystal oscillator interference signal after, described method also includes:
Change described software parameter, until the sensitivity parameter of tuner meets default sensitivity parameter threshold value；
Preserve the described software parameter making the sensitivity parameter of tuner meet default sensitivity parameter threshold value.
Method the most according to claim 1, it is characterised in that described software parameter is the control of crystal oscillator
The state parameter of circuit.
Method the most according to claim 2, it is characterised in that described control circuit is by least one door
Circuit in parallel forms, and the state parameter of the control circuit of described crystal oscillator includes opening of at least one gate circuit described
The state opening or closing.
Method the most according to claim 1, it is characterised in that the software ginseng that described basis pre-saves
Also include after the driving electric current of number adjustment crystal oscillator:
The frequency deviation of regulation crystal oscillator, carries out frequency compensation.
5. the control device of a crystal oscillator interference, it is characterised in that described device includes:
Acquisition module, when crystal oscillator interference signal being detected, for obtaining the frequency being disturbed；
Judge module, for judge the frequency of the user received input be whether described in the frequency that is disturbed；
Drive current adjusting module, if the judged result of described judge module is yes, for according to protecting in advance
The software parameter deposited adjusts the driving electric current of crystal oscillator；
Wherein, described device also includes:
Software parameter change module, is used for changing described software parameter, until the sensitivity parameter of tuner is full
The sensitivity parameter threshold value that foot is preset；
Software parameter preserves module, makes the sensitivity parameter of tuner meet default sensitivity ginseng for preserving
The described software parameter of number threshold value.
Device the most according to claim 5, it is characterised in that described software parameter is the control of crystal oscillator
The state parameter of circuit.
Device the most according to claim 6, it is characterised in that described control circuit is by least one door
Circuit in parallel forms, and the state parameter of the control circuit of described crystal oscillator includes opening of at least one gate circuit described
The state opening or closing.
Device the most according to claim 5, it is characterised in that described device also includes:
Frequency compensation module, for regulating the frequency deviation of crystal oscillator, carries out frequency compensation.
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| CN201210409943.0A CN102938633B (en) | 2012-10-24 | 2012-10-24 | The control method of a kind of crystal oscillator interference and device |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1314752A (en) * | 2000-03-17 | 2001-09-26 | 朗迅科技公司 | Correcting method for frequency tracking of local oscillator of radio equipment receiver |
| CN1675841A (en) * | 2002-08-12 | 2005-09-28 | Enq半导体有限公司 | Method and device for injection locking of voltage controlled oscillators using direct digital tuning |
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| US7610034B2 (en) * | 2005-10-18 | 2009-10-27 | General Instrument Corporation | Method and apparatus for selection of design parameters for double conversion tuner to prevent radiated immunity degradation |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1314752A (en) * | 2000-03-17 | 2001-09-26 | 朗迅科技公司 | Correcting method for frequency tracking of local oscillator of radio equipment receiver |
| CN1675841A (en) * | 2002-08-12 | 2005-09-28 | Enq半导体有限公司 | Method and device for injection locking of voltage controlled oscillators using direct digital tuning |
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