CN106571817A - Wide-band agile low-phase noise frequency integrated generator - Google Patents
Wide-band agile low-phase noise frequency integrated generator Download PDFInfo
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- CN106571817A CN106571817A CN201610987603.4A CN201610987603A CN106571817A CN 106571817 A CN106571817 A CN 106571817A CN 201610987603 A CN201610987603 A CN 201610987603A CN 106571817 A CN106571817 A CN 106571817A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
Abstract
The invention belongs to the technical field of frequency integrated generators, and particularly provides a wide-band agile low-phase noise frequency integrated generator, which comprises a high-stability crystal oscillator, a down-conversion mixed-frequency phase-locked loop module, a preset traction module and a control module. The down-conversion mixed-frequency phase-locked loop module adopts a twice down-conversion structure of coarse frequency conversion and fine frequency conversion. Therefore, the down-conversion mixed-frequency phase-locked loop module has the advantages of higher frequency output and lower phase noise, while the size of the down-conversion mixed-frequency phase-locked loop module is kept small. Meanwhile, the preset traction module completes the traction and the coarse tuning of a VCO, so that the wrong locking is avoided. Moreover, the locking speed of the phase-locked loop is remarkably improved, and the agility is realized. According to the technical scheme of the wide-band agile low-phase noise frequency integrated generator, the advantages of low phase noise, small stepping, wide bandwidth and agility are realized.
Description
Technical field
The invention belongs to comprehensive frequency generator technology, more particularly to broadband agile low phase noise frequency synthesis occur
Device.
Background technology
Radar Technology quickly grows, as one of its core technology, the requirement of comprehensive frequency generator also more and more higher.With
Stepping up for frequency, low phase noise becomes increasingly difficult to realize that conventional internal refers to crystal oscillator and list with spuious
The structure of phaselocked loop has not gradually reached technical requirements.Due to the characteristic of Radar Technology itself, except for low phase noise
With the requirement of low spurious, often also need to comprehensive frequency generator and realize wide bandwidth, little stepping, high stability, and rapid jumping.
In order to realize little stepping, low spurious, a kind of effective way is using DDS (direct digital frequency synthesiers at present
Device, Direct Digital Synthesizer) drive phaselocked loop；But such structure is by limiting that phaselocked loop itself bottom is made an uproar
System, mutually making an uproar, it is sufficiently low to be difficult to；Additionally, such structure, the frequency hopping time is still determined by phaselocked loop, thus the jump of DDS
Frequency speed cannot also be embodied, and rapid jumping cannot still be realized.In order to obtain it is sufficiently low mutually make an uproar, general method be use
High-frequency crystal oscillator makees reference to reduce the frequency multiplication times N of phaselocked loop, but for crystal oscillator, is difficult to do under too high frequency
To satisfied degree of stability；In order to obtain sufficiently fast saltus step speed, general measure is to relax loop filter, but wide ring
Road filtering can cause again for spuious degree of suppression not enough, or even bring the unstable of link.As can be seen here, under microwave frequency band
It is a thorny thing to take into account little stepping, high stability, low phase noise, wide bandwidth and agile.
The content of the invention
It is an object of the invention to provide a kind of broadband agile low phase noise comprehensive frequency generator, can realize low phase
Position noise, little stepping, wide bandwidth and agile.Technical solution of the present invention is：
A kind of broadband agile low phase noise comprehensive frequency generator, including：High stability crystal oscillator, down coversion Mixing PLL mould
Block, preset traction module and control module, the high stability crystal oscillator output produce rate-adaptive pacemaker through down coversion mixing lock phase module
Export as frequency synthesizer；Frequency information is simultaneously transmitted by the frequency of the preset traction module detection frequency synthesizer output
To control module, while receiving control module return control signal, preset voltage is provided according to control signal and down coversion is mixed
The output frequency of phase-locked loop module is drawn；Control module receives external control information and preset traction module return frequency letter
Breath, control down coversion Mixing PLL module and prefabricated traction module；Characterized in that, the down coversion Mixing PLL module
Including：4 power splitters, doubler, DDS (Direct Digital Synthesizer, Direct Digital Synthesizer), lock
Xiang Huan, loop filter, 2 adders, VCO (voltage controlled oscillator), 2 frequency mixers, 2 symmetrical band filters；High temperature
Through the first power splitter work(point two-way, wherein the reference input as phaselocked loop all the way, another road is through doubler for crystal oscillator output
High-frequency signal is produced, the high-frequency signal divides two-way through the second power splitter work(, wherein defeated with the radio frequency of the first frequency mixer all the way
Enter connected, the input then as DDS of another road of the second power splitter, the output of DDS are connected with the local oscillator end of the second frequency mixer；Lock
The output of phase ring is connected with an input of adder after loop filtering, another input preset voltage of adder, plus
The output of musical instruments used in a Buddhist or Taoist mass is connected with the input of VCO；The output of VCO is connected with the local oscillator end of the first frequency mixer；The output of the first frequency mixer
It is connected with 2 symmetrical band filters after the 3rd power splitter respectively, the first band filter selects down coversion
Frequency, exports to the second frequency mixer and is input into as radio frequency；Second band filter selects up-conversion frequency, exports to the 4th work(
Divide device work(point two-way, wherein exporting the output as frequency synthesizer all the way, another road is then exported to preset traction module；Second
The output of frequency mixer as phase demodulation radio frequency input feedback to phaselocked loop.
Further, the preset traction module includes：Frequency divider, frequency detection module and DAC (digital-to-analogue conversions
Device, Digital to analog converter), wherein frequency divider connects the output of the 4th power splitter, and the output of frequency divider connects
Frequency detection module is connect, frequency detection module connects the control module, DAC is controlled for down coversion mixing lock phase by control module
Ring module provides preset voltage.
Beneficial effects of the present invention：
Down coversion source is divided into thick frequency conversion and thin frequency conversion, and is matched somebody with somebody by improving down coversion Mixing PLL structure by the present invention
Two symmetrical symmetrical band pass filters of mid frequency are closed, following effect can be reached：
First time down coversion is completed at the first frequency mixer, this down-converts to thick frequency conversion, and the result of down coversion is generation pass
In two symmetrical frequency signals of VCO output frequencies：Fvco-F1, Fvco+F1；Due in thick frequency conversion, F1With FvcoGap is larger, Fvco
There can be very big bandwidth and not affect frequency to select；Design balanced-filter, the first wave filter select Fvco-F1, the second filtering
Device selects Fvco+F1, such benefit is：Mixing for the first time is made full use of, the phase demodulation frequency of phaselocked loop had both been reduced, and not
In the case that secondary deterioration is mutually made an uproar, rate-adaptive pacemaker is improve, i.e., relative to traditional down coversion phaselocked loop, with relatively low phase demodulation frequency
Realize higher output.
Second down coversion is completed at the second frequency mixer：DDS possesses fine stepping, can complete minimum frequency and jump
Become；As the output frequency of frequency synthesizer is taken from the output of the first frequency mixer, can be expressed as：
Fo=Fvco+F1=N*Fref+2F1+Fdds, N represents frequency multiplication of phase locked loop number of times, FddsRepresent DDS output frequencies；
Its resolution is determined by DDS resolution；As can be seen here, fine tuning mixing is independently opened, can be protected under Broadband emission
Minimum resolution is stayed, so as to realize level that many wideband frequency synthesizers are not reached.
In a word, this invention simplifies designing, so as to, under small size, realize higher rate-adaptive pacemaker and low phase noise.
Further, since possessing the signal source and frequency content of many inside frequency synthesizer, traditional frequency synthesizer there may be wrong lock
Situation；For this purpose, VCO letters then can be correctly drawn in the cooperation of the frequency detection module and VT preset module in the present invention
Number：Frequency detector detects frequency signal to exclude temperature and environment for the impact of phaselocked loop, so as to allow FPGA (to control mould
Block) calculate revised coarse-tuning voltage, be preset in adder by DAC module output, complete traction for VCO and
Coarse tuning, so as to avoid wrong lock；Also, exactly such voltage is preset, and the lock speed of phaselocked loop is significantly improved, and is realized
Agile.
Description of the drawings
Fig. 1 illustrates the modular structure block diagram of agile low phase noise comprehensive frequency generator in broadband of the present invention；
Fig. 2 is shown as the process of double conversion in comprehensive frequency generator of the present invention, the process of prefabricated traction and output
The selection of frequency；
Fig. 3 illustrate whole frequency it is comprehensive implement block diagram, represent frequency conversion and frequency-selecting details, frequency pulling details.
Specific embodiment
With reference to the accompanying drawings and examples the present invention is described in further details.
A kind of broadband agile Low phase noise frequency synthesizer of the present embodiment offer, including high stability crystal oscillator, frequency multiplication module,
DDS module, phase-locked loop module, frequency mixing module, filtration module, preset traction module, frequency detection module and control module；Its
In, frequency multiplication module, phase-locked loop module, DDS module, frequency mixing module belong to down coversion Mixing PLL mould with filtration module
Block；Preset traction module and frequency detection module belong to preset traction module, as shown in Figure 1.The present invention frequency synthesizer be
The combination of down coversion Mixing PLL and preset traction twice.
In down coversion Mixing PLL, high stable crystal oscillator is carried out into frequency multiplication, lock phase, DDS samplings and mixing, so as to
Altofrequency to Low phase noise is exported；Its implementation is：Exported as big stepping with doubler, DDS outputs as little stepping, two
Secondary lower mixing VCO frequency：Phase demodulation frequency is greatly lowered in first time down coversion, in second down coversion, is exported with DDS
Signal provides sufficiently small resolution so that the resolution of phase demodulation frequency also accordingly diminishes, so as to reduce the N values of phaselocked loop,
Obtain lower resolution.Wherein, high stability crystal oscillator is selected as 100MHz constant-temperature crystal oscillators, its degree of stability need to reach 0.001ppm with
Ensure overall degree of stability.Its output is divided into two-way output through a 3dB power splitter work(.Wherein all the way through M frequency multiplication, then
Through the 2nd 3dB power splitters work(point two-way, refer to respectively as DDS and the first mixing source.The output of DDS is used as the second mixing
Source, the input with the second mixed device are connected.Another road that the reference signal of phaselocked loop then comes from a 3dB power splitters work(point is defeated
Go out.As Fig. 2 illustrates down coversion mixing twice.
In order to ensure phase noise and spuious performance, phaselocked loop uses integer phase demodulation.Its decimal stepping is provided by DDS.Remove
Outside this, in order to obtain higher output frequency, the frequency of VCO is not directly exported, but by the product work(of first time frequency mixer
Divide output；The up-converting filter symmetrical with the down conversion filter in loop is devised on output link, so as to VCO's
Improve output frequency on the basis of output again and not secondary deterioration is mutually made an uproar, final rate-adaptive pacemaker is Fo=Fvco+F1=N*
Fref+2F1+Fdds, F is higher by than traditional down coversion Mixing PLL1Frequency.
More than module in, although frequency synthesis can be realized, but in view of the restriction of phaselocked loop itself, during its frequency hopping
Between it is very long, and due to there is other frequency components after DDS mixing, there is the risk of wrong lock in phaselocked loop, therefore devise preset leading
Draw module；Frequency detector detects frequency signal to exclude temperature and environment for the impact of phaselocked loop, so as to allow FPGA to calculate
Go out revised coarse-tuning voltage, be preset in adder by DAC module output, complete the traction and coarse tuning for VCO,
So as to avoid wrong lock.Additionally, exactly such voltage is preset, the lock speed of the first phaselocked loop is significantly improved, and realizes victory
Become.
FPGA module is then connected by control line and down coversion Mixing PLL module, and voltage preset module, mainly
There is provided and for the control of phaselocked loop N values, the control of DDS frequency words and reading frequency information and analyze, DAC is controlled with
Realize agile and lock is in right value.
The above, specific embodiment only of the invention, any feature disclosed in this specification, except non-specifically
Narration, can be replaced by other equivalent or alternative features with similar purpose；Disclosed all features or all sides
Method or during the step of, in addition to mutually exclusive feature and/or step, can be combined in any way.
Claims (2)
1. a kind of broadband agile low phase noise comprehensive frequency generator, including：High stability crystal oscillator, down coversion Mixing PLL mould
Block, preset traction module and control module, the high stability crystal oscillator output produce rate-adaptive pacemaker through down coversion mixing lock phase module
Export as frequency synthesizer；Frequency information is simultaneously transmitted by the frequency of the preset traction module detection frequency synthesizer output
To control module, while receiving control module return control signal, preset voltage is provided according to control signal and down coversion is mixed
The output frequency of phase-locked loop module is drawn；Control module receives external control information and preset traction module return frequency letter
Breath, control down coversion Mixing PLL module and prefabricated traction module；Characterized in that, the down coversion Mixing PLL module
Including：4 power splitters, doubler, DDS, phaselocked loop, loop filter, 2 adders, VCO, 2 frequency mixers, 2 are symmetrical
Band filter；The output of high temperature crystal oscillator divides two-way through the first power splitter work(, wherein the reference input as phaselocked loop all the way, separately
High-frequency signal is produced through doubler all the way, the high-frequency signal through the second power splitter work(point two-way, wherein all the way with first
The radio frequency input of frequency mixer is connected, the input then as DDS of another road of the second power splitter, the output of DDS and the second frequency mixer
Local oscillator end be connected；The output of phaselocked loop is connected with an input of adder after loop filtering, adder another
Input connection preset voltage, the output of adder are connected with the input of VCO；The output of VCO and the local oscillator end phase of the first frequency mixer
Even；The output of the first frequency mixer is connected with 2 symmetrical band filters after the 3rd power splitter respectively, the first band logical
Wave filter selects down converted frequencies, exports to the second frequency mixer and is input into as radio frequency；Second band filter selects change
Again and again rate, exports to the 4th power splitter work(point two-way, wherein exporting the output as frequency synthesizer all the way, another road then exports
To preset traction module；The output of the second frequency mixer as phase demodulation radio frequency input feedback to phaselocked loop.
2. the broadband agile low phase noise comprehensive frequency generator as described in claim 1, it is characterised in that the preset traction
Module includes：Frequency divider, frequency detection module and DAC, wherein frequency divider connect the output of the 4th power splitter, the output of frequency divider
Rate of connections detection module, frequency detection module connect the control module, control DAC for down coversion mixing lock by control module
Phase ring module provides preset voltage.
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Cited By (4)
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| CN107483049A (en) * | 2017-09-22 | 2017-12-15 | 成都菲斯洛克电子技术有限公司 | A kind of broadband frequency agility frequency source |
| CN108344977A (en) * | 2018-02-09 | 2018-07-31 | 中国科学院电子学研究所 | Frequency stepping radar signal source system |
| CN113258929A (en) * | 2021-07-15 | 2021-08-13 | 成都威频通讯技术有限公司 | Low phase noise frequency source circuit |
| CN116170009A (en) * | 2023-04-21 | 2023-05-26 | 成都世源频控技术股份有限公司 | Broadband, low phase noise and fine stepping frequency source generating circuit |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107483049A (en) * | 2017-09-22 | 2017-12-15 | 成都菲斯洛克电子技术有限公司 | A kind of broadband frequency agility frequency source |
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| CN113258929B (en) * | 2021-07-15 | 2021-09-24 | 成都威频通讯技术有限公司 | Low phase noise frequency source circuit |
| CN116170009A (en) * | 2023-04-21 | 2023-05-26 | 成都世源频控技术股份有限公司 | Broadband, low phase noise and fine stepping frequency source generating circuit |
| CN116170009B (en) * | 2023-04-21 | 2023-07-25 | 成都世源频控技术股份有限公司 | Broadband, low phase noise and fine stepping frequency source generating circuit |
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| CN106571817B (en) | 2019-11-05 |
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