CN205051679U - Frequency source generator - Google Patents
Frequency source generator Download PDFInfo
- Publication number
- CN205051679U CN205051679U CN201520770368.6U CN201520770368U CN205051679U CN 205051679 U CN205051679 U CN 205051679U CN 201520770368 U CN201520770368 U CN 201520770368U CN 205051679 U CN205051679 U CN 205051679U
- 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 utility model discloses a frequency source generator, aim at providing one kind can the increase of frequency source stability and the quick frequency source generator of frequency source locking, it is slow to have solved the frequency locking, the problem of output unstability, its technical scheme main points are voltage -controlled oscillator still has been coupled and has preset the voltage module, it includes digital analog converter and singlechip to preset the voltage module, the singlechip is used for providing digital drive signal, digital analog converter is coupled and is used for receiving digital drive signal and analog output voltage signal in the singlechip, voltage -controlled oscillator is coupled and is used for receiving analog output voltage signal for to produce initial frequency source in advance in digital analog converter. The mesh of stabilizing quick output frequence source has been reached, the utility model is suitable for a wireless communication technology field.
Description
Technical field
The utility model relates to a kind of wireless communication technology field, and more particularly, it relates to a kind of frequency source generator.
Background technology
Frequency source is the baseband signal source of electronic system (radar, communication, observing and controlling, navigation etc.), mainly comprises fixing point frequency source and frequency synthesis source two class frequently.Frequency synthesis source, also known as frequency synthesizer or frequency synthesizer, can be divided into direct-type and indirect type by its constituted mode.
Indirect frequency synthesizer adopts phase-locked loop (PLL) technology, is most widely used at present.The circuit that this synthetic method uses realizes phase feedback by phase demodulation to control thus the closed-loop system realizing frequency-tracking.Simulaed phase locked loop is additional make an uproar mutually very low.Along with the development of semiconductor technology, frequency source generator is also in continuous development.
Frequency of phase locking source output signal making an uproar mutually in loop bandwidth mainly affects by reference signal, phase discriminator, frequency divider and frequency dividing ratio, depends primarily on making an uproar mutually of voltage-controlled oscillator (VCO) beyond loop bandwidth.The reference source of Low phase noise and VCO, the phase discriminator (PD) of Low phase noise and frequency divider is selected also to be very important to falling Low phase noise.Loop is all relevant with loop design to band inside and outside noise suppression feature, loop additional phase noise etc., and characteristic optimizing of therefore making an uproar mutually is very important.
For frequency source of the prior art because feedback circuit has inertia, its Frequency Locking speed is slower, its locking (frequency error factor) speed is correlated with loop bandwidth, initial frequency difference, and the original frequency making frequency source export owing to there is larger deviation for the control voltage of frequency source generator voltage controlled oscillator (VCO) in the process powered on is unstable, and make Frequency Locking slack-off further, therefore also output facet is stablized for quickening frequency source frequency quick lock in and have much room for improvement.
Utility model content
For the deficiency that prior art exists, the purpose of this utility model is to provide one can improve frequency source stability and frequency source locks frequency source generator fast.
For achieving the above object, the utility model provides following technical scheme: a kind of frequency source generator, wave band input and wave band output, described wave band input access outside source, phase-locked loop circuit is coupled with between described wave band input and wave band output, described phase-locked loop circuit comprises voltage-controlled oscillator and phase discriminator, described voltage-controlled oscillator and phase discriminator form loop, described voltage-controlled oscillator output frequency source signal, described voltage-controlled oscillator is also coupled with preset voltage module, described preset voltage module comprises digital to analog converter and single-chip microcomputer,
Described single-chip microcomputer is in order to provide digital drive signals;
Described digital to analog converter is coupled to single-chip microcomputer in order to receive digital drive signals and to export analog voltage signal;
Described voltage-controlled oscillator is coupled to digital to analog converter and exports analog voltage signal in order to produce original frequency source in advance in order to receive.
Preferably, described phase-locked loop circuit also comprises the first frequency mixer and frequency multiplier handover module;
Described frequency multiplier handover module for switching the frequency multiplier of different multiples,
Described frequency multiplier handover module is coupled to wave band input to receive outside source, and output switching frequency-doubled signal;
Described first frequency mixer is coupled between frequency multiplier handover module and voltage-controlled oscillator, switches frequency-doubled signal and frequency source signal, and export the first mixed frequency signal to receive respectively;
The first frequency divider is coupled with between described phase discriminator and wave band input;
Described first frequency divider is coupled to wave band input to receive outside source, and exports the first fractional frequency signal;
The input of described phase discriminator is coupled to the first frequency divider to receive the first fractional frequency signal, and the feedback end of described phase discriminator is coupled to the first frequency mixer to receive the first mixed frequency signal, and the output of described phase discriminator is to export phase discrimination signal;
The control end of described voltage-controlled oscillator is coupled to the output of phase discriminator to receive phase discrimination signal and to control oscillator output frequencies source to wave band output in response to phase discrimination signal with control voltage.
Preferably, described frequency multiplier handover module comprises the first switching frequency multiplier, the second switching frequency multiplier and diverter switch;
Described first switches the frequency multiplier that frequency multiplier is two frequencys multiplication;
Described second switching frequency multiplier is the frequency multiplier of frequency tripling;
Described diverter switch is respectively coupled to the first switching frequency multiplier and second and switches frequency multiplier and switch frequency multiplier switch for switching frequency multiplier and second to first.
Preferably, described diverter switch comprises the first single-pole double-throw switch (SPDT) and second single-pole double-throw switch (SPDT) of interlock setting, and the fixed contact of described first single-pole double-throw switch (SPDT) is coupled to wave band input, and the fixed contact of described second single-pole double-throw switch (SPDT) is coupled to the first frequency mixer.
Preferably, between described first frequency mixer and phase discriminator, be coupled with the second frequency mixer, between described first frequency mixer and wave band input, be coupled with the second frequency divider;
Described second frequency divider is coupled to wave band input to receive outside source, and exports the second fractional frequency signal;
Described second frequency mixer is coupled to the second frequency divider to receive the second fractional frequency signal, and exports the second mixed frequency signal, and the first mixed frequency signal that the local oscillations source of described second frequency mixer is exported by the output of the first frequency mixer provides;
The feedback end of described phase discriminator is coupled to the output of the second frequency mixer to receive the second mixed frequency signal.
Compared with prior art, the beneficial effects of the utility model are: by coupling preset voltage module at voltage-controlled oscillator, make voltage-controlled oscillator can starting of oscillation more fast, solve in power up because phase deviation is larger, phase-locked loop modulates the slow problem of stable frequency source, make to shorten modulating time by preset voltage, make one to power on, whole device can the frequency source of stable output fast.
Accompanying drawing explanation
Fig. 1 is the structure principle chart of the utility model frequency source generator embodiment.
Embodiment
With reference to Fig. 1, the utility model frequency source generator embodiment is described further.
A kind of frequency source generator, wave band input and wave band output, described wave band input access outside source, be coupled with phase-locked loop circuit between described wave band input and wave band output, described phase-locked loop circuit comprises voltage-controlled oscillator and phase discriminator.Voltage-controlled oscillator (VCO) refers to that output frequency and input control voltage have the oscillating circuit (VCO) of corresponding relation, frequency is the oscillation of a function device VCO of applied signal voltage, the operating state of oscillator or the component parameters of oscillation circuit, by the control of input control voltage, just can form a voltage controlled oscillator.Phase discriminator makes the phase difference between output voltage and two input signals have the circuit determining relation.The Mathematical Modeling of sinusoidal phase discriminator PFD is:
vi(t)＝Visin(ω0t+θi(t))
v0(t)＝V0sin(ω0t+θ0(t))
θe(t)＝θi(t)-θ0(t)
vd(t)＝Kpsin(θe(t))
Wherein Kp=KmViV0/2, is sinusoidal phase characteristic.When loop enters locking, phase error is very little, has sin (θ e (t)) ≈ θ e (t).Now, error voltage vd (t) that phase discriminator PFD exports is proportional to phase error theta e (t), namely linear.
Voltage-controlled oscillator VCO is the device of frequency voltage transitions, and its frequency of oscillation changes linearly along with input control voltage, that is: 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 the voltage-controlled sensitivity of voltage-controlled oscillator VCO.
The control characteristic of the voltage-controlled oscillator VCO in practical application is only in limited range of linearity control, and surpass after going beyond the scope, voltage-controlled sensitivity will decline.To formula above formula both sides integration, then the transfer function that Laulace conversion obtains voltage-controlled oscillator VCO can be expressed as:
θe(s)＝K0ve(s)/s
This expression formula has an integrating factor 1/s, and this is the integral relation formation between phase place and angular frequency.This is integral action is that VCO is intrinsic, and title voltage-controlled oscillator VCO is the intrinsic integral element in phase-locked loop usually.This integral action plays considerable effect in the loop.
Voltage-controlled oscillator and phase discriminator form loop, and described voltage-controlled oscillator output frequency source signal, described voltage-controlled oscillator is also coupled with preset voltage module, and described preset voltage module comprises digital to analog converter and single-chip microcomputer.Digital to analog converter, also known as D/A converter, is converted to direct voltage or direct current by the digital quantity of parallel binary, is to provide direct voltage in the present embodiment.And single-chip microcomputer is just in order to provide digital drive signals, drive digital to analog converter work to provide analog voltage signal by digital drive signals, it does not make improvements software section, be connected with digital to analog converter the function realizing its components and parts and self have by existing singlechip equipment by wire, the model that single-chip microcomputer uses is STC89C51 single-chip microcomputer, as more common single-chip microcomputer, it drives digital to analog converter to realize output dc voltage by single-chip microcomputer is prior art, do not repeat them here its principle, but it should be noted that, the direct voltage exported by digital to analog converter provides preset voltage signal for voltage-controlled oscillator, thus make phase-locked loop circuit can starting of oscillation more fast, the research for prior art and creationary combination.
Described single-chip microcomputer is in order to provide digital drive signals; Described digital to analog converter is coupled to single-chip microcomputer in order to receive digital drive signals and to export analog voltage signal; Described voltage-controlled oscillator is coupled to digital to analog converter and exports analog voltage signal in order to produce original frequency source in advance in order to receive.Make in power up because phase deviation is larger, it is slow that phase-locked loop modulates stable frequency source, make to shorten modulating time by preset voltage, solve in power up because phase deviation is larger, phase-locked loop modulates the slow problem of stable frequency source, make to shorten modulating time by preset voltage, make one to power on, whole device can the frequency source of stable output fast.
Phase-locked loop circuit also comprises the first frequency mixer and frequency multiplier handover module; Described frequency multiplier handover module is for switching the frequency multiplier of different multiples, and described frequency multiplier handover module is coupled to wave band input to receive outside source, and output switching frequency-doubled signal; Described first frequency mixer is coupled between frequency multiplier handover module and voltage-controlled oscillator, switches frequency-doubled signal and frequency source signal, and export the first mixed frequency signal to receive respectively; The first frequency divider is coupled with between described phase discriminator and wave band input; Described first frequency divider is coupled to wave band input to receive outside source, and exports the first fractional frequency signal; The input of described phase discriminator is coupled to the first frequency divider to receive the first fractional frequency signal, and the feedback end of described phase discriminator is coupled to the first frequency mixer to receive the first mixed frequency signal, and the output of described phase discriminator is to export phase discrimination signal; The control end of described voltage-controlled oscillator is coupled to the output of phase discriminator to receive phase discrimination signal and to control oscillator output frequencies source to wave band output in response to phase discrimination signal with control voltage.
Adopt the effect of frequency mixer mainly to play and different frequency signals carried out mixing superposition or subtracts each other.α is signal frequency amount, and β is local frequency amount, produces and difference frequency.Cos α cos β=[cos (alpha+beta)+cos (alpha-beta)]/2, frequency mixer is made up of non-linear element and frequency-selective circuit usually, so band pass filter of the prior art can be replaced with frequency mixer, 26S Proteasome Structure and Function improves stability and the PGC demodulation speed of phase-locked loop circuit in prior art.
Frequency multiplier makes output signal frequency equal the circuit of frequency input signal integral multiple, incoming frequency is f1, then output frequency is f0=nf1, and coefficient n is any positive integer, claims frequency multiplication number of times, frequency multiplier is of many uses, as master oscillator made to vibrate at lower frequency after transmitter employing frequency multiplier, to improve frequency stability, frequency modulation equipment frequency multiplier increases frequency shift (FS), in phase keying communication equipment, frequency multiplier is an important composition unit of carrier recovery circuit; Frequency mixer and output signal frequency equal two frequency input signal sums, difference or the circuit for both other combinations, and frequency mixer is made up of non-linear element and frequency-selective circuit usually.
Frequency multiplier handover module comprises the first switching frequency multiplier, second and switches frequency multiplier and diverter switch; Described first switches the frequency multiplier that frequency multiplier is two frequencys multiplication; Described second switching frequency multiplier is the frequency multiplier of frequency tripling; Described diverter switch is respectively coupled to the first switching frequency multiplier and second and switches frequency multiplier and switch frequency multiplier switch for switching frequency multiplier and second to first.
Diverter switch comprises the first single-pole double-throw switch (SPDT) K1 and the second single-pole double-throw switch (SPDT) K2 of interlock setting, and the fixed contact of described first single-pole double-throw switch (SPDT) K1 is coupled to wave band input, and the fixed contact of described second single-pole double-throw switch (SPDT) K2 is coupled to the first frequency mixer.
Be coupled with the second frequency mixer between first frequency mixer and phase discriminator, between described first frequency mixer and wave band input, be coupled with the second frequency divider; Described second frequency divider is coupled to wave band input to receive outside source, and exports the second fractional frequency signal; Described second frequency mixer is coupled to the second frequency divider to receive the second fractional frequency signal, and exports the second mixed frequency signal, and the first mixed frequency signal that the local oscillations source of described second frequency mixer is exported by the output of the first frequency mixer provides; The feedback end of described phase discriminator is coupled to the output of the second frequency mixer to receive the second mixed frequency signal.
The outside source of wave band input access can be certain value in 3225 ~ 3275Mhz, switch frequency multiplier by the first single-pole double-throw switch (SPDT) K1 and the second single-pole double-throw switch (SPDT) K2 to the first switching frequency multiplier and second to switch to obtain required frequency-doubled signal, according to be the first switching frequency multiplier, be two frequencys multiplication, the local oscillations source of the first frequency mixer MIX1 is provided by voltage-controlled oscillator VCO simultaneously, be 6 ~ 12Ghz, the signal source of a 5 ~ 2200Mhz is produced by the first frequency mixer MIX1, in the local oscillations source using this signal source as the second frequency mixer MIX2, second frequency mixer MIX2 receives 800 ~ 1600Mhz by the second frequency divider, both produce a 50 ~ 500Mhz by the effect of the second frequency mixer MIX2, and be input to the feedback end of phase discriminator PFD, the input of phase discriminator PFD receives the signal source of 100Mhz by the first frequency divider, effect by phase discriminator PFD and the calculating by formula 20*logN, N is second fractional frequency signal of feedback signal divided by input of feedback end, namely when size and the second fractional frequency signal equal and opposite in direction of feedback signal, phase discriminator PFD output low level can be made, control voltage controls oscillator VCO exports 6 ~ 12Ghz signal source at wave band output.
Adopt frequency divider and phase-locked loop circuit to combine, the performance of frequency source generator significantly improves, cost significantly reduces and have high reliability.
The above is only preferred implementation of the present utility model, protection range of the present utility model be not only confined to above-described embodiment, and all technical schemes belonged under the utility model thinking all belong to protection range of the present utility model.It should be pointed out that for those skilled in the art, do not departing from the some improvements and modifications under the utility model principle prerequisite, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (5)
1. a frequency source generator, wave band input and wave band output, described wave band input access outside source, phase-locked loop circuit is coupled with between described wave band input and wave band output, described phase-locked loop circuit comprises voltage-controlled oscillator and phase discriminator, described voltage-controlled oscillator and phase discriminator form loop, described voltage-controlled oscillator output frequency source signal, it is characterized in that: described voltage-controlled oscillator is also coupled with preset voltage module, described preset voltage module comprises digital to analog converter and single-chip microcomputer;
Described single-chip microcomputer is in order to provide digital drive signals;
Described digital to analog converter is coupled to single-chip microcomputer in order to receive digital drive signals and to export analog voltage signal;
Described voltage-controlled oscillator is coupled to digital to analog converter and exports analog voltage signal in order to produce original frequency source in advance in order to receive.
2. frequency source generator according to claim 1, is characterized in that: described phase-locked loop circuit also comprises the first frequency mixer and frequency multiplier handover module;
Described frequency multiplier handover module for switching the frequency multiplier of different multiples,
Described frequency multiplier handover module is coupled to wave band input to receive outside source, and output switching frequency-doubled signal;
Described first frequency mixer is coupled between frequency multiplier handover module and voltage-controlled oscillator, switches frequency-doubled signal and frequency source signal, and export the first mixed frequency signal to receive respectively;
The first frequency divider is coupled with between described phase discriminator and wave band input;
Described first frequency divider is coupled to wave band input to receive outside source, and exports the first fractional frequency signal;
The input of described phase discriminator is coupled to the first frequency divider to receive the first fractional frequency signal, and the feedback end of described phase discriminator is coupled to the first frequency mixer to receive the first mixed frequency signal, and the output of described phase discriminator is to export phase discrimination signal;
The control end of described voltage-controlled oscillator is coupled to the output of phase discriminator to receive phase discrimination signal and to control oscillator output frequencies source to wave band output in response to phase discrimination signal with control voltage.
3. a kind of frequency source generating means according to claim 2, is characterized in that: described frequency multiplier handover module comprises the first switching frequency multiplier, second and switches frequency multiplier and diverter switch;
Described first switches the frequency multiplier that frequency multiplier is two frequencys multiplication;
Described second switching frequency multiplier is the frequency multiplier of frequency tripling;
Described diverter switch is respectively coupled to the first switching frequency multiplier and second and switches frequency multiplier and switch frequency multiplier switch for switching frequency multiplier and second to first.
4. frequency source generator according to claim 2, it is characterized in that: described diverter switch comprises the first single-pole double-throw switch (SPDT) and second single-pole double-throw switch (SPDT) of interlock setting, the fixed contact of described first single-pole double-throw switch (SPDT) is coupled to wave band input, and the fixed contact of described second single-pole double-throw switch (SPDT) is coupled to the first frequency mixer.
5. the frequency source generator according to Claims 2 or 3 or 4, is characterized in that: be coupled with the second frequency mixer between described first frequency mixer and phase discriminator, is coupled with the second frequency divider between described first frequency mixer and wave band input;
Described second frequency divider is coupled to wave band input to receive outside source, and exports the second fractional frequency signal;
Described second frequency mixer is coupled to the second frequency divider to receive the second fractional frequency signal, and exports the second mixed frequency signal, and the first mixed frequency signal that the local oscillations source of described second frequency mixer is exported by the output of the first frequency mixer provides;
The feedback end of described phase discriminator is coupled to the output of the second frequency mixer to receive the second mixed frequency signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520770368.6U CN205051679U (en) | 2015-09-30 | 2015-09-30 | Frequency source generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520770368.6U CN205051679U (en) | 2015-09-30 | 2015-09-30 | Frequency source generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205051679U true CN205051679U (en) | 2016-02-24 |
Family
ID=55345221
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520770368.6U Active CN205051679U (en) | 2015-09-30 | 2015-09-30 | Frequency source generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205051679U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106559075A (en) * | 2015-09-30 | 2017-04-05 | 中星联华科技（北京）有限公司 | Numerical frequency source generator |
| CN113676199A (en) * | 2021-08-25 | 2021-11-19 | 福建科立讯通信有限公司 | Solution method for receiver reference frequency source frequency multiplication interference and receiver |
| CN114844619A (en) * | 2022-05-13 | 2022-08-02 | 南京尤尼泰信息科技有限公司 | Frequency signal generating device and method based on satellite navigation signal |
-
2015
- 2015-09-30 CN CN201520770368.6U patent/CN205051679U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106559075A (en) * | 2015-09-30 | 2017-04-05 | 中星联华科技（北京）有限公司 | Numerical frequency source generator |
| CN106559075B (en) * | 2015-09-30 | 2019-11-26 | 中星联华科技（北京）有限公司 | Numerical frequency source generator |
| CN113676199A (en) * | 2021-08-25 | 2021-11-19 | 福建科立讯通信有限公司 | Solution method for receiver reference frequency source frequency multiplication interference and receiver |
| CN114844619A (en) * | 2022-05-13 | 2022-08-02 | 南京尤尼泰信息科技有限公司 | Frequency signal generating device and method based on satellite navigation signal |
| CN114844619B (en) * | 2022-05-13 | 2023-12-22 | 南京尤尼泰信息科技有限公司 | Frequency signal generating device and method based on satellite navigation signal |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102769462A (en) | Direct digital frequency phase-locked frequency multiplier circuit | |
| CN103490777A (en) | Low spurious frequency synthesizer | |
| CN104320137B (en) | A kind of phase-locked loop frequency synthesizer | |
| CN205051679U (en) | Frequency source generator | |
| CN102882520B (en) | Based on clock-frequency difference divider and the method for sigma-delta phase-locked loop | |
| CN204131498U (en) | A kind of phase-locked loop frequency synthesizer | |
| CN204669344U (en) | A kind of phase-locked loop frequency prewired circuit | |
| CN101694998A (en) | Locking system and method | |
| CN108964660A (en) | A kind of high-resolution low-power consumption spread spectrum control circuit based on phase delay compensation | |
| CN105375922B (en) | A kind of microwave signal source for miniature atomic clock | |
| CN104467835A (en) | Frequency-agile and low-phase-noise frequency source | |
| CN104393871A (en) | Frequency synthesizer for driving phase-locked loop after up-converting DDS | |
| CN108055035A (en) | A kind of wideband frequency expanding unit of optical-electronic oscillator | |
| CN104320135A (en) | High-purity frequency source | |
| CN103178840A (en) | Phase-locked loop circuit and working method thereof | |
| CN105634443A (en) | Clock generating device and fractional frequency divider thereof | |
| CN205320060U (en) | High -speed frequency hopping frequency synthesizer in broadband | |
| CN106559075B (en) | Numerical frequency source generator | |
| CN205051680U (en) | Frequency source generator | |
| CN205647494U (en) | Ultra wide band low phase noise hangs down stray frequency synthesizer | |
| CN204103898U (en) | A kind of frequency synthesizer | |
| CN204836137U (en) | Frequency synthesizer | |
| CN208316704U (en) | A kind of C-band radar high stable high isolation multiple signals source circuit | |
| CN205070979U (en) | Frequency source generating device | |
| CN202978896U (en) | Combined broadband rapid frequency hopping source |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |