CN106559075B - Numerical frequency source generator - Google Patents
Numerical frequency source generator Download PDFInfo
- Publication number
- CN106559075B CN106559075B CN201510640468.1A CN201510640468A CN106559075B CN 106559075 B CN106559075 B CN 106559075B CN 201510640468 A CN201510640468 A CN 201510640468A CN 106559075 B CN106559075 B CN 106559075B
- Authority
- CN
- China
- Prior art keywords
- frequency
- coupled
- signal
- voltage
- source
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
The invention discloses a kind of numerical frequency source generators, being intended to provide one kind can be improved frequency source stability and the quick numerical frequency source generator of frequency source locking, it is unstable to solve frequency source output, lock slower problem, its key points of the technical solution are that the voltage-controlled oscillator has been also coupled to preset voltage module, the preset voltage module includes digital analog converter and single-chip microcontroller；The single-chip microcontroller is to provide digital drive signals；The digital analog converter is coupled to single-chip microcontroller to receive digital drive signals and export analog voltage signal；The voltage-controlled oscillator is coupled to digital analog converter to receive analog voltage signal to generate original frequency source in advance；The input terminal of the voltage-controlled oscillator has been also coupled to voltage buffer module, and the voltage buffer module is to absorb due to voltage spikes.Reach frequency source output to stablize, quickly, effect easy to adjust, the present invention is suitable for wireless communication technology field for locking.
Description
Technical field
The present invention relates to a kind of wireless communication technology fields, more specifically, it relates to a kind of numerical frequency source generator.
Background technique
Frequency source is the baseband signal source of electronic system (radar, communication, observing and controlling, navigation etc.), mainly includes fixed point
Two class of frequency frequency source and frequency synthesis source.Frequency synthesis source is also known as frequency synthesizer or frequency synthesizer, can by its constituted mode
It is divided into direct-type and indirect type.
Indirect frequency synthesizer uses phaselocked loop (PLL) technology, is most widely used at present.What this synthetic method used
Circuit is the closed-loop system for realizing phase feedback control by phase demodulation to realize frequency-tracking.With the hair of semiconductor technology
Exhibition, numerical frequency source generator are also constantly developing.
Frequency of phase locking source output signal in loop bandwidth mutually make an uproar mainly by reference signal, phase discriminator, frequency divider and
Frequency dividing ratio influences, and mutually making an uproar for voltage-controlled oscillator (VCO) is depended primarily on other than loop bandwidth.Select the reference of Low phase noise
Source and VCO, the phase discriminator (PD) of Low phase noise and frequency divider are also critically important to drop Low phase noise.Loop is to inside and outside noise suppressed
Characteristic, loop additional phase noise etc. are all related with loop design, therefore characteristic optimizing of mutually making an uproar is particularly significant.
Need to be converted to ultrashort signal the signal of hyper band in general signal processing, to meet each frequency range
The reception demand of reception device, for example, radar reception frequency range in 8-40GHkz, and the frequency range of artificial ionization's communication is generally 30-
144Mhz, so needing first to handle the frequency range of artificial ionization's communication by broken number frequency division synthesizer, by small
There can be the contradiction between high-resolution and low noise in number crossover frequency synthesizer treatment process, when high-resolution to be realized
When, phase demodulation frequency must be very low, and frequency dividing ratio N is very big at this time；Noise can be increased in a manner of 20lgN at the same time, greatly
It is degrading mutually making an uproar for signal, and limits loop bandwidth, is unfavorable for quick lock in, using being very limited, while also can
There are spuious.
Currently, in the market (application No. is the Chinese patents of CN200710048686.1 to disclose a kind of fractional frequency division frequency
Rate synthesizer), the second control circuit that it is made up of literal register and comparator, the input terminal of second control circuit and the
The connection of one control circuit, output end connect with pulse corrector, reduces phase noise by second control circuit, but this
Circuit structure is difficult to meet the requirements to realize for 100MHz frequency, and the signal source of electronic system is needed 100MHz
Input signal be converted to the high-frequency signal source of 6-12GHz, the design of whole system is needed to redesign.
Need to carry out again to convert could be at for obtained signal source after being handled simultaneously by broken number frequency division synthesizer
For the signal of required hyper band, still can there is a problem of mutually making an uproar in conversion process and spuious, and fractional frequency division
Obtained signal source is discrete signal source after frequency synthesizer processing, has biggish section, needs setting for different frequency range
It is standby to be corresponding to it, it is just able to achieve the function that ultra-high frequency band signal is converted to it, so needing to purchase multiple devices, cost increases
Add, and will appear inconvenience in use, need constantly to replace, so numerical frequency source generator used at present
With certain room for improvement.
For frequency source in the prior art since feed circuit has inertia, Frequency Locking speed is slower, locking
(frequency error factor) speed is related with loop bandwidth, initial frequency difference, and for numerical frequency source generator during powering on
The control voltage of voltage controlled oscillator (VCO) is unstable due to making the original frequency of frequency source output there are biggish deviation, and
And make Frequency Locking further slack-off, therefore need to be changed for accelerating frequency source frequency quick lock in and stablizing output facet
Into.
Further, the prior art is improved numerical frequency source using phaselocked loop and digital circuit in conjunction with by the way of and is occurred
Device, and there are more switch elements in digital circuit, voltage controlled oscillator (VCO), which is adjusted, by switch element can yet be regarded as
One good method, but there are one when adjusting voltage controlled oscillator (VCO) to be difficult to solve for switch element
Problem, the exactly unstable situation in frequency of occurrences source when numerical frequency source generator powers on, reason by analysis and
Research is the discovery that since switch element work is in the state of continuous alternate conduction and shutdown, is influenced on voltage controlled oscillator (VCO)
It is very big, therefore be obstructed using the research and development of the scheme of digital circuit, it needs to solve problem above using a new scheme.
Summary of the invention
In view of the deficiencies of the prior art, the present invention intends to provide one kind can be improved frequency source stability and
Frequency source locks quick numerical frequency source generator.
To achieve the above object, the present invention provides the following technical scheme that a kind of numerical frequency source generator, including wave band
Input terminal and wave band output end, the wave band input terminal access outside source, the wave band input terminal and wave band output end it
Between be coupled with phase-locked loop circuit, the phase-locked loop circuit includes first voltage control oscillator and the second phase discriminator, described first
Voltage-controlled oscillator and the second phase discriminator form loop, and the first voltage controls oscillator output frequencies source signal, described
First voltage control oscillator has been also coupled to preset voltage module, and the preset voltage module includes digital analog converter and monolithic
Machine；
The single-chip microcontroller is to provide digital drive signals；
The digital analog converter is coupled to single-chip microcontroller to receive digital drive signals and export analog voltage signal；
The first voltage control oscillator is coupled to digital analog converter to receive analog voltage signal to produce in advance
Raw original frequency source.
Preferably, the input terminal of the first voltage control oscillator has been also coupled to voltage buffer module, and the voltage is slow
Die block is to absorb surge voltage.
Preferably, the voltage buffer module includes capacitor, and described capacitor one end is connect with voltage buffer module, the other end
Ground connection.
Preferably, the phase-locked loop circuit further includes the first frequency mixer and frequency multiplier switching module；
The frequency multiplier switching module is used to switch the frequency multiplier of different multiples,
The frequency multiplier switching module is coupled to wave band input terminal to receive outside source, and exports switching frequency multiplication letter
Number；
First frequency mixer is coupled between frequency multiplier switching module and first voltage control oscillator, to receive respectively
Switch frequency-doubled signal and frequency source signal, and exports the first mixed frequency signal；
The first frequency divider is coupled between second phase discriminator and wave band input terminal；
First frequency divider is coupled to wave band input terminal to receive outside source, and exports the first fractional frequency signal；
The input terminal of second phase discriminator is coupled to the first frequency divider to receive the first fractional frequency signal, second phase demodulation
The feedback end of device is coupled to the first frequency mixer to receive the first mixed frequency signal, and the output end of second phase discriminator is to export phase demodulation
Signal；
The control terminal of the first voltage control oscillator is coupled to the output end of the second phase discriminator to receive phase discrimination signal
And oscillator output frequencies source is controlled to wave band output end to control first voltage in response to phase discrimination signal.
Preferably, the frequency source generating device further includes fractional frequency division synthesis module, the fractional frequency division synthesis module
Including frequency input, external signal source output terminal, broken number frequency division synthesizer, second voltage control oscillator, third times
Frequency device and third frequency mixer；
The frequency input accesses fixed frequency；
The frequency input is successively coupled to broken number frequency division synthesizer, second voltage control oscillator and external letter
Number source output terminal；
The broken number frequency division synthesizer is to export fractional frequency division signal；
The input terminal of the third frequency multiplier is coupled to frequency input, for receiving outside source and exporting third times
Frequency signal；
The input terminal of the third frequency mixer is coupled to the output end of third frequency multiplier, for receiving third frequency-doubled signal simultaneously
Third mixed frequency signal is exported, the local oscillations source of the third frequency mixer is provided by second voltage control oscillator；
The first phase discriminator has been also coupled between the broken number frequency division synthesizer and second voltage control oscillator；
The input terminal of first phase discriminator is coupled to the output end of broken number frequency division synthesizer, for receiving decimal point
Frequency signal, the feedback end of first phase discriminator are coupled to the output end of third frequency mixer to receive third mixed frequency signal, described
The output end of first phase discriminator is to export the first phase discrimination signal；
The control terminal of the second voltage control oscillator is coupled to the output end of the first phase discriminator, for receiving the first mirror
Phase signals simultaneously export the first oscillator signal to external signal to control second voltage control oscillator in response to the first phase discrimination signal
Source output terminal；
External signal source output terminal is coupled to wave band input terminal to provide outside source.
Preferably, the frequency multiplier switching module includes that the first switching frequency multiplier, the second switching frequency multiplier and switching switch；
The first switching frequency multiplier is the frequency multiplier of two frequencys multiplication；
The second switching frequency multiplier is the frequency multiplier of frequency tripling；
The switching switch is respectively coupled to the first switching frequency multiplier and the second switching frequency multiplier is used for the first switching times
Frequency device is switched over the second switching frequency multiplier.
Preferably, the switching switch includes the first single-pole double-throw switch (SPDT) and the second single-pole double-throw switch (SPDT) of linkage setting,
The stationary contact of first single-pole double-throw switch (SPDT) is coupled to wave band input terminal, the stationary contact coupling of second single-pole double-throw switch (SPDT)
In the first frequency mixer.
Preferably, the second frequency mixer, first frequency mixer are coupled between first frequency mixer and the second phase discriminator
The second frequency divider is coupled between wave band input terminal；
Second frequency divider is coupled to wave band input terminal to receive outside source, and exports the second fractional frequency signal；
Second frequency mixer is coupled to the second frequency divider to receive the second fractional frequency signal, and exports the second mixed frequency signal,
The local oscillations source of second frequency mixer is provided by the first mixed frequency signal that the output end of the first frequency mixer is exported；
The feedback end of second phase discriminator is coupled to the output end of the second frequency mixer to receive the second mixed frequency signal.
Preferably, the third frequency multiplier is 32 frequency multipliers.
Compared with prior art, the invention has the benefit that coupling preset electricity by controlling oscillator in first voltage
Die block enables first voltage to control the more quick starting of oscillation of oscillator, solves in power up since phase is inclined
Difference is larger, and phase-locked loop modulates the slow problem of stable frequency source, so as to shorten tune by way of preset voltage
Time processed, so that one powers on, whole device can quickly export stable frequency source.
Detailed description of the invention
Fig. 1 is the structure principle chart one of numerical frequency source generator embodiment of the present invention；
Fig. 2 is the structure principle chart two of numerical frequency source generator embodiment of the present invention；
Fig. 3 is the frequency conversion schematic diagram of numerical frequency source generator preferred embodiment of the present invention.
1 in figure, frequency multiplier switching module；2, fractional frequency division synthesis module.
Specific embodiment
It is described further referring to figs. 1 to 3 pairs of numerical frequency source generator embodiments of the present invention.
A kind of numerical frequency source generator, including wave band input terminal and wave band output end, the wave band input terminal access are outer
Portion's signal source, is coupled with phase-locked loop circuit between the wave band input terminal and wave band output end, the phase-locked loop circuit includes the
One voltage-controlled oscillator and the second phase discriminator.Voltage-controlled oscillator (VCO) refers to output frequency and input control voltage has pair
The oscillating circuit (VCO) that should be related to, frequency are the oscillation of a function device VCO of applied signal voltage, the working condition of oscillator or
Control of the component parameters of oscillation circuit by input control voltage, so that it may constitute a voltage controlled oscillator.Phase discriminator is to make to export
Phase difference between voltage and two input signals has the circuit of determining relationship.The mathematical model of sinusoidal phase discriminator PD2 are as follows:
Vi (t)=Visin (ω 0t+ θ i (t))
V0 (t)=V0sin (ω 0t+ θ 0 (t))
θ e (t)=θ i (t)-θ 0 (t)
Vd (t)=Kpsin (θ e (t))
Wherein Kp=KmViV0/2, as sinusoidal phase characteristic.When loop enters locking, phase error very little has
sin(θe(t)) ≈ θe(t).At this point, the error voltage vd (t) of phase discriminator PD2 output is proportional to phase error theta e (t),
It is i.e. linear.
Voltage-controlled oscillator VCO is the device for converting voltages into frequency, its frequency of oscillation is with input control electricity
Pressure linearly changes, it may be assumed that ω v (t)=ω 0+K0vc (t)
Wherein ω v (t) is the instantaneous angular frequency of VCO；ω 0 is the centre frequency of VCO；K0 is voltage-controlled oscillating
The voltage-controlled sensitivity of device VCO.
The control characteristic of voltage-controlled oscillator VCO in practical application only in limited range of linearity control, exceeds
After this range, voltage-controlled sensitivity will decline.Formula above formula both sides are integrated, then Laulace converts to obtain voltage-controlled oscillating
The transmission function of device VCO may be expressed as:
θ e (s)=K0ve (s)/s
The expression formula has an integrating factor 1/s, this is the integral relation formation between phase and angular frequency.This is long-pending
It is allocated as with being VCO intrinsic, commonly referred to as voltage-controlled oscillator VCO is the intrinsic integral element in phase-locked loop.This product
It is allocated as with playing considerable effect in the loop.
First voltage controls oscillator and the second phase discriminator forms loop, and the first voltage controls oscillator output frequencies
Source signal, the first voltage control oscillator have been also coupled to preset voltage module, and the preset voltage module includes that digital-to-analogue turns
Parallel operation and single-chip microcontroller.The digital quantity of parallel binary is converted to DC voltage or straight by digital analog converter, also known as D/A converter
Galvanic electricity stream is to provide for DC voltage in the present embodiment.And single-chip microcontroller is intended merely to provide digital drive signals, is driven with number
Dynamic signal drives digital analog converter to work to provide analog voltage signal, is logical not making improvements to software section
Existing singlechip equipment is crossed to be connected by conducting wire with digital analog converter to realize function possessed by its component itself, monolithic
The model STC89C51 single-chip microcontroller that machine uses, as more common single-chip microcontroller, it drives digital analog converter by single-chip microcontroller
Realize that output DC voltage is the prior art, its principle that details are not described herein, it should be understood that, pass through digital analog converter
The DC voltage of output controls oscillator for first voltage and provides preset voltage signal, so that phase-locked loop circuit can be more
Add quick starting of oscillation, is research and creative combination for the prior art.
The single-chip microcontroller is to provide digital drive signals；The digital analog converter is coupled to single-chip microcontroller to receive number
Driving signal simultaneously exports analog voltage signal；The first voltage control oscillator is coupled to digital analog converter to receive output
Analog voltage signal to generate original frequency source in advance.So that since phase deviation is larger in power up, locking phase loopback
It is slow that road modulates stable frequency source, makes to shorten the modulation time by preset voltage, solve in power up by
Larger in phase deviation, phase-locked loop modulates the slow problem of stable frequency source, to shorten by preset voltage
The time is modulated, so that one powers on, whole device can quickly export stable frequency source.First voltage controls oscillator and mirror
Capacitor has been also coupled between phase device.Capacitor can eliminate the influence that switch element exports frequency source in digital circuit, from
And the d. c. voltage signal for making power up preset is more stable.
The input terminal of first voltage control oscillator has been also coupled to voltage buffer module, and the voltage buffer module is to inhale
Receive surge voltage.Voltage buffer module includes capacitor C in the present embodiment, and the pressure stabilization function of capacitor is mainly used to can be absorbed
Surge voltage, the one end the capacitor C are connect with voltage buffer module, other end ground connection.
Phase-locked loop circuit further includes the first frequency mixer and frequency multiplier switching module 1；Frequency multiplier switching module 1 is for switching not
With the frequency multiplier of multiple, frequency multiplier switching module 1 is coupled to wave band input terminal to receive outside source, and exports switching frequency multiplication
Signal；First frequency mixer is coupled between frequency multiplier switching module 1 and first voltage control oscillator, to receive switching times respectively
Frequency signal and frequency source signal, and export the first mixed frequency signal；First point is coupled between second phase discriminator and wave band input terminal
Frequency device；First frequency divider is coupled to wave band input terminal to receive outside source, and exports the first fractional frequency signal；Second phase discriminator
Input terminal be coupled to the first frequency divider to receive the first fractional frequency signal, the feedback end of the second phase discriminator is coupled to the first frequency mixer
To receive the first mixed frequency signal, the output end of the second phase discriminator is to export phase discrimination signal；The control of first voltage control oscillator
End is coupled to the output end of the second phase discriminator to receive phase discrimination signal and control first voltage control vibration in response to phase discrimination signal
Device output frequency source is swung to wave band output end.
It is primarily served using the effect of frequency mixer and different frequency signals is subjected to mixing superposition or is subtracted each other.α is signal frequency
Rate amount, β are local frequency amount, generation and difference frequency.Cos α cos β=[cos (alpha+beta)+cos (alpha-beta)]/2, frequency mixer is usually by non-
Linear element and frequency-selective circuit are constituted, it is possible to bandpass filter in the prior art is replaced with frequency mixer, in structure and
Functionally improve the stability of phase-locked loop circuit in the prior art and PGC demodulation speed.
Frequency multiplier makes output signal frequency be equal to the circuit of frequency input signal integral multiple, and input frequency is f1, then exports
Frequency is f0=nf1, and coefficient n is any positive integer, claims frequency multiplication number, and frequency multiplier is widely used, if transmitter is using after frequency multiplier
Master oscillator oscillation can be made in lower frequency, to improve frequency stability, frequency modulation equipment increases frequency shift (FS) with frequency multiplier, in phase
In the keying communication equipment of position, frequency multiplier is an important composition unit of carrier recovery circuit；Frequency mixer, that is, output signal frequency etc.
In the sum of two frequency input signals, poor or for other combinations of the two circuit, frequency mixer is usually returned by non-linear element and frequency-selecting
Road is constituted.
Frequency multiplier switching module 1 includes that the first switching frequency multiplier, the second switching frequency multiplier and switching switch；Described first cuts
Change the frequency multiplier that frequency multiplier is two frequencys multiplication；The second switching frequency multiplier is the frequency multiplier of frequency tripling；The switching switch difference
It is coupled to the first switching frequency multiplier and the second switching frequency multiplier is used to carry out the first switching frequency multiplier and the second switching frequency multiplier
Switching.
The the first single-pole double-throw switch (SPDT) K1 and the second single-pole double-throw switch (SPDT) K2 that switch includes linkage setting are changed, described first is single
The stationary contact of double-pole double throw switch K1 is coupled to wave band input terminal, and the stationary contact of the second single-pole double-throw switch (SPDT) K2 is coupled to first
Frequency mixer.
The second frequency mixer is coupled between first frequency mixer and the second phase discriminator, between the first frequency mixer and wave band input terminal
It is coupled with the second frequency divider；Second frequency divider is coupled to wave band input terminal to receive outside source, and exports the second frequency dividing letter
Number；Second frequency mixer is coupled to the second frequency divider to receive the second fractional frequency signal, and exports the second mixed frequency signal, the second frequency mixer
The first mixed frequency signal for being exported by the output end of the first frequency mixer of local oscillations source provide；The feedback end coupling of second phase discriminator
The output end of the second frequency mixer is connected to receive the second mixed frequency signal.
It can be in the outside source (3225-3275MHz) of wave band input terminal input low-frequency band, so by above scheme
The frequency source (6-12GHz) of high band is generated from wave band output end afterwards.
This frequency source generating device further includes fractional frequency division synthesis module 2, and the fractional frequency division synthesis module 2 includes frequency
Input terminal, external signal source output terminal, broken number frequency division synthesizer, second voltage control oscillator, third frequency multiplier and the
Three-mixer；Frequency input accesses fixed frequency；The frequency input is successively coupled to broken number frequency division synthesizer,
Two voltage-controlled oscillators and external signal source output terminal；The broken number frequency division synthesizer is to export fractional frequency division letter
Number；The input terminal of the third frequency multiplier is coupled to frequency input, for receiving outside source and exporting third frequency multiplication letter
Number；The input terminal of the third frequency mixer is coupled to the output end of third frequency multiplier, for receiving third frequency-doubled signal and exporting
The local oscillations source of third mixed frequency signal, the third frequency mixer is provided by second voltage control oscillator；The fractional frequency division
The first phase discriminator has been also coupled between frequency synthesizer and second voltage control oscillator；The input terminal coupling of first phase discriminator
It is connected to the output end of broken number frequency division synthesizer, for receiving fractional frequency division signal, the feedback end coupling of first phase discriminator
The output end of third frequency mixer is connected to receive third mixed frequency signal, the output end of first phase discriminator is to export the first phase demodulation
Signal；The control terminal of the second voltage control oscillator is coupled to the output end of the first phase discriminator, for receiving the first phase demodulation
Signal simultaneously exports the first oscillator signal to outside source to control second voltage control oscillator in response to the first phase discrimination signal
Output end；External signal source output terminal is coupled to wave band input terminal to provide outside source.
Thus circuit can tentatively be converted the frequency signal that fixed frequency external signal source output terminal inputs, and be exported
The frequency band of intermediate frequency successively improves the precision of frequency source.It is to be converted into the fixed-frequency source of 100MHz in the present embodiment
The outside source of 3225-3275MHz.
As shown in figure 3, the fixed-frequency source of frequency input access is 100Mhz, by inputting the signal source of 100Mhz
Into broken number frequency division synthesizer, broken number frequency division synthesizer is allowed to export some in a 25~75Mhz
Value, while the value is 0.3 stepping, that is, has after decimal point three, and the value is input to the input terminal of the first phase discriminator PD1,
The input terminal of third frequency multiplier is coupled to frequency input so that the signal source of 100 Mhz generates 3200Mhz's after frequency multiplication
The signal source of the 3200Mhz is being input in third frequency mixer MIX3, is controlling oscillator by second voltage by signal source
For VCO1 to provide the local oscillations source of third frequency mixer, local oscillations source is the signal source of 3225~3275Mhz, mixed by third
Frequency device MIX3 exports the feedback signal of 25~75Mhz after subtracting each other, be input to the feedback end of the first phase discriminator PD1, passes through the first mirror
The effect of phase device PD1 and calculating by formula 20*logN, N are the feedback signal of feedback end divided by the decimal point of input terminal
Frequency signal may make the first phase discriminator PD1 output low that is, when the size of feedback signal is equal with fractional frequency division signal magnitude
Level, control second voltage control oscillator export value corresponding in 3225~3275Mhz in first band output
Signal source Vi, such as feedback signal are 25.001Mhz, and fractional frequency division signal is also 25.001Mhz, so that the value of N is 0, even if
Second voltage control oscillator must be controlled in the signal source Vi of first band output output 3225.001Mhz.
The outside source of wave band input terminal access can be some value in 3225~3275Mhz, double by the first hilted broadsword
Throw switch K1 and the second single-pole double-throw switch (SPDT) K2 switches over to obtain the first switching frequency multiplier and the second switching frequency multiplier
The frequency-doubled signal needed, according to be the first switching frequency multiplier, as two frequencys multiplication, while the local vibration of the first frequency mixer MIX1
Swing source by first voltage control oscillator VCO2 provide, as 6~12Ghz, by the first frequency mixer MIX1 generate one 5~
The signal source of 2200Mhz, using this signal source as the local oscillations source of the second frequency mixer MIX2, the second frequency mixer MIX2 passes through
Second frequency divider receives 800~1600Mhz, and the two generates a 50~500Mhz by the effect of the second frequency mixer MIX2,
And it is input to the feedback end of phase discriminator PD2, the input terminal of phase discriminator PD2 receives the signal of 100Mhz by the first frequency divider
Source, the effect by phase discriminator PD2 and the calculating by formula 20*logN, N are the feedback signal of feedback end divided by input terminal
The second fractional frequency signal, i.e., when the size of feedback signal and the second fractional frequency signal it is equal in magnitude when, that is, may make phase discriminator PD2 defeated
Low level out, control first voltage control oscillator VCO export the signal source of 6~12Ghz in wave band output.
Using fractional frequency division synthesis module 2, digital circuit and phase-locked loop circuit are combined, and digital circuit is mainly digital-to-analogue conversion
Device and single-chip microcontroller, therefore the performance of numerical frequency source generator greatly improves, cost is greatly reduced and has high reliability.
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (5)
1. a kind of numerical frequency source generator, including wave band input terminal and wave band output end, the wave band input terminal access is external
Signal source, is coupled with phase-locked loop circuit between the wave band input terminal and wave band output end, the phase-locked loop circuit includes first
Voltage-controlled oscillator and the second phase discriminator, first voltage control oscillator and the second phase discriminator form loop, and described the
One voltage-controlled oscillator output frequency source signal, it is characterised in that: the first voltage control oscillator has been also coupled to preset
Voltage module, the preset voltage module includes digital analog converter and single-chip microcontroller；
The single-chip microcontroller is to provide digital drive signals；
The digital analog converter is coupled to single-chip microcontroller to receive digital drive signals and export analog voltage signal；
The voltage-controlled oscillator is coupled to digital analog converter to receive analog voltage signal to generate initial frequency in advance
Rate source；
The input terminal of the first voltage control oscillator has been also coupled to voltage buffer module, and the voltage buffer module is to inhale
Receive surge voltage；
The voltage buffer module includes capacitor, and described capacitor one end is connect with voltage buffer module, other end ground connection；
The phase-locked loop circuit further includes the first frequency mixer and frequency multiplier switching module；
The frequency multiplier switching module is used to switch the frequency multiplier of different multiples,
The frequency multiplier switching module is coupled to wave band input terminal to receive outside source, and exports switching frequency-doubled signal；
First frequency mixer is coupled between frequency multiplier switching module and first voltage control oscillator, to receive switching respectively
Frequency-doubled signal and frequency source signal, and export the first mixed frequency signal；
The first frequency divider is coupled between second phase discriminator and wave band input terminal；
First frequency divider is coupled to wave band input terminal to receive outside source, and exports the first fractional frequency signal；
The input terminal of second phase discriminator is coupled to the first frequency divider to receive the first fractional frequency signal, second phase discriminator
Feedback end is coupled to the first frequency mixer to receive the first mixed frequency signal, and the output end of second phase discriminator is to export phase demodulation letter
Number；
The control terminal of the first voltage control oscillator is coupled to the output end of the second phase discriminator to receive phase discrimination signal and sound
Oscillator output frequencies source should be controlled to wave band output end to control first voltage in phase discrimination signal；
The frequency source generator further includes fractional frequency division synthesis module, and the fractional frequency division synthesis module includes frequency input
End, external signal source output terminal, broken number frequency division synthesizer, second voltage control oscillator, third frequency multiplier and third are mixed
Frequency device；
The frequency input accesses fixed frequency；
The frequency input is successively coupled to broken number frequency division synthesizer, second voltage control oscillator and outside source
Output end；
The broken number frequency division synthesizer is to export fractional frequency division signal；
The input terminal of the third frequency multiplier is coupled to frequency input, for receiving outside source and exporting third frequency multiplication letter
Number；
The input terminal of the third frequency mixer is coupled to the output end of third frequency multiplier, for receiving third frequency-doubled signal and exporting
The local concussion source of third mixed frequency signal, the third frequency mixer is provided by second voltage oscillator；
The first phase discriminator has been also coupled between the broken number frequency division synthesizer and second voltage control oscillator；
The input terminal of first phase discriminator is coupled to the output end of broken number frequency division synthesizer, for receiving fractional frequency division letter
Number, the feedback end of first phase discriminator is coupled to the output end of third frequency mixer to receive third mixed frequency signal, and described first
The output end of phase discriminator is to export the first phase discrimination signal；
The control terminal of the second voltage control oscillator is coupled to the output end of the first phase discriminator, for receiving the first phase demodulation letter
Number and corresponding to the first phase discrimination signal with control second voltage control oscillator export the first oscillator signal it is defeated to outside source
Outlet；
External signal source output terminal is coupled to wave band input terminal for providing outside source.
2. numerical frequency source generator according to claim 1, it is characterised in that: first frequency mixer and the second phase demodulation
It is coupled with the second frequency mixer between device, is coupled with the second frequency divider between first frequency mixer and wave band input terminal；
Second frequency divider is coupled to wave band input terminal to receive outside source, and exports the second fractional frequency signal；
Second frequency mixer is coupled to the second frequency divider to receive the second fractional frequency signal, and exports the second mixed frequency signal, described
The local oscillations source of second frequency mixer is provided by the first mixed frequency signal that the output end of the first frequency mixer is exported；
The feedback end of second phase discriminator is coupled to the output end of the second frequency mixer to receive the second mixed frequency signal.
3. numerical frequency source generator according to claim 1, it is characterised in that: the frequency multiplier switching module includes the
One switching frequency multiplier, the second switching frequency multiplier and switching switch；
The first switching frequency multiplier is the frequency multiplier of two frequencys multiplication；
The second switching frequency multiplier is the frequency multiplier of frequency tripling；
The switching switch is respectively coupled to the first switching frequency multiplier and the second switching frequency multiplier is used for the first switching frequency multiplier
It is switched over the second switching frequency multiplier.
4. numerical frequency source generator according to claim 3, it is characterised in that: the switching switch includes linkage setting
The first single-pole double-throw switch (SPDT) and the second single-pole double-throw switch (SPDT), it is defeated that the stationary contact of first single-pole double-throw switch (SPDT) is coupled to wave band
Enter end, the stationary contact of second single-pole double-throw switch (SPDT) is coupled to the first frequency mixer.
5. numerical frequency source generator according to claim 1, it is characterised in that: the third frequency multiplier is 32 frequencys multiplication
Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510640468.1A CN106559075B (en) | 2015-09-30 | 2015-09-30 | Numerical frequency source generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510640468.1A CN106559075B (en) | 2015-09-30 | 2015-09-30 | Numerical frequency source generator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106559075A CN106559075A (en) | 2017-04-05 |
| CN106559075B true CN106559075B (en) | 2019-11-26 |
Family
ID=58417629
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510640468.1A Active CN106559075B (en) | 2015-09-30 | 2015-09-30 | Numerical frequency source generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106559075B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110138383B (en) * | 2018-02-09 | 2023-09-05 | 海能达通信股份有限公司 | Frequency generation circuit |
| CN111431554B (en) * | 2020-03-27 | 2021-11-09 | 深圳清华大学研究院 | Transmitter and wireless transceiver having the same |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2438274Y (en) * | 2000-08-22 | 2001-07-04 | 信息产业部电子第五十四研究所 | Digital direct frequency synthesis and phase-locked loop type frequency-hopping frequency synthesizer |
| CN102751983A (en) * | 2012-07-30 | 2012-10-24 | 中国电子科技集团公司第四十一研究所 | Multi-loop synthesized local oscillation device of TD-LTE (time division-long term evolution) comprehensive test instrument |
| CN203086442U (en) * | 2012-12-31 | 2013-07-24 | 四川九洲电器集团有限责任公司 | Phase-locked fast frequency hopping source based on adder |
| CN205051679U (en) * | 2015-09-30 | 2016-02-24 | 中星联华科技（北京）有限公司 | Frequency source generator |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20060002110A (en) * | 2004-07-01 | 2006-01-09 | 유흥균 | Frequency synthesizer having the ultra-fast switching characteristic |
-
2015
- 2015-09-30 CN CN201510640468.1A patent/CN106559075B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2438274Y (en) * | 2000-08-22 | 2001-07-04 | 信息产业部电子第五十四研究所 | Digital direct frequency synthesis and phase-locked loop type frequency-hopping frequency synthesizer |
| CN102751983A (en) * | 2012-07-30 | 2012-10-24 | 中国电子科技集团公司第四十一研究所 | Multi-loop synthesized local oscillation device of TD-LTE (time division-long term evolution) comprehensive test instrument |
| CN203086442U (en) * | 2012-12-31 | 2013-07-24 | 四川九洲电器集团有限责任公司 | Phase-locked fast frequency hopping source based on adder |
| CN205051679U (en) * | 2015-09-30 | 2016-02-24 | 中星联华科技（北京）有限公司 | Frequency source generator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106559075A (en) | 2017-04-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6463112B1 (en) | Phase locked-loop using sub-sampling | |
| CN105187060B (en) | The phase-locked loop circuit and its implementation of a kind of low phase noise | |
| CN106385255B (en) | A kind of polycyclic apparatus for frequency synthesizing that low noise high-resolution is tunable and method | |
| CN201328110Y (en) | Phase-locking frequency tracking device | |
| CN103490777B (en) | low spurious frequency synthesizer | |
| CN103795410B (en) | A kind of broadband frequency agility frequency source based on two phase-locked loop | |
| KR101664634B1 (en) | Frequency signal generating system and display device | |
| CN105978562B (en) | Super Low phase noise and the high-frequency narrow-band of ultra-high frequency resolution ratio synthesis source circuit and method | |
| CN105375922B (en) | A kind of microwave signal source for miniature atomic clock | |
| CN107968652A (en) | A kind of low phase noise shortwave frequency hopping frequency synthesizer | |
| US6977556B1 (en) | Rational frequency synthesizers | |
| CN108988857A (en) | A kind of broadband low phase noise frequency synthesizer and method based on optical-electronic oscillator | |
| CN104320135A (en) | High-purity frequency source | |
| CN103975531A (en) | Frequency synthesis device and method | |
| CN106559075B (en) | Numerical frequency source generator | |
| CN110289858B (en) | Broadband fine stepping agile frequency conversion combination system | |
| CN205051679U (en) | Frequency source generator | |
| CN104836581A (en) | High-performance broadband frequency source generation circuit employing multi-harmonic reference, and generation method | |
| CN106571817A (en) | Wide-band agile low-phase noise frequency integrated generator | |
| CN104300977A (en) | Low-phase-noise high-speed frequency synthesizing system | |
| CN205647494U (en) | Ultra wide band low phase noise hangs down stray frequency synthesizer | |
| CN205356307U (en) | Frequency synthesizer of short wave receiver | |
| CN205051680U (en) | Frequency source generator | |
| CN208445546U (en) | A kind of broadband low phase noise frequency synthesizer based on optical-electronic oscillator | |
| CN108270439A (en) | A kind of compound system frequency synthesizer based on novel frequency adjusting method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |