CN106571817B - A kind of broadband agile low phase noise comprehensive frequency generator - Google Patents
A kind of broadband agile low phase noise comprehensive frequency generator Download PDFInfo
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- CN106571817B CN106571817B CN201610987603.4A CN201610987603A CN106571817B CN 106571817 B CN106571817 B CN 106571817B CN 201610987603 A CN201610987603 A CN 201610987603A CN 106571817 B CN106571817 B CN 106571817B
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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
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Abstract
The invention belongs to comprehensive frequency generator technologies, specifically providing a kind of broadband agile low phase noise comprehensive frequency generator includes: high stability crystal oscillator, down coversion Mixing PLL module, preset traction module and control module, wherein down coversion Mixing PLL module uses thick frequency conversion and thin frequency conversion down coversion structure twice, to realize higher rate-adaptive pacemaker and low phase noise under small size；Meanwhile preset traction module completes the traction and coarse tuning for VCO, so as to avoid mistake lock；Also, the lock speed of phaselocked loop significantly improves, and realizes agile.To sum up, the purpose of the present invention is to provide a kind of broadband agile low phase noise comprehensive frequency generator, low phase noise, small stepping, wide bandwidth and agile be can be realized.
Description
Technical field
The invention belongs to comprehensive frequency generator technology, in particular to broadband agile low phase noise frequency synthesis occurs
Device.
Background technique
Radar Technology is quickly grown, and as one of its core technology, the requirement of comprehensive frequency generator is also higher and higher.With
Stepping up for frequency, low phase noise be increasingly difficult to realize with spuious have become, conventional internal refer to crystal oscillator and list
Technical requirements are gradually not achieved in the structure of phaselocked loop.Due to the characteristic of Radar Technology itself, in addition to for low phase noise
With the requirement of low spurious, comprehensive frequency generator is needed to realize wide bandwidth, small stepping, high stability and rapid jumping toward contact.
In order to realize small stepping, low spurious, a kind of effective way is using DDS (direct digital frequency synthesier at present
Device, Direct Digital Synthesizer) driving phaselocked loop；But the limit that such structure is made an uproar by phaselocked loop itself bottom
System, mutually making an uproar, it is sufficiently low to be difficult to；In addition, such structure, the frequency hopping time is still determined by phaselocked loop, thus the jump of DDS
Frequency speed can not also embody, and rapid jumping still cannot achieve.It is sufficiently low in order to obtain mutually to make an uproar, general method be using
High-frequency crystal oscillator is made with reference to the frequency multiplication times N to reduce phaselocked loop, however for crystal oscillator, it is difficult to do under excessively high frequency
To satisfied stability；Sufficiently fast jump speed in order to obtain, general measure are the rings for relaxing loop filter, but wide
Road filtering will lead to inadequate for spuious degree of suppression again, or even bring the unstable of link.It can be seen that under microwave frequency band
Taking into account small stepping, high stability, low phase noise, wide bandwidth and agile is an intractable thing.
Summary of the invention
The purpose of the present invention is to provide a kind of broadband agile low phase noise comprehensive frequency generators, can be realized low phase
Position noise, small stepping, wide bandwidth and agile.Technical solution of the present invention are as follows:
A kind of broadband agile low phase noise comprehensive frequency generator, comprising: high stability crystal oscillator, down coversion Mixing PLL mould
Block, preset traction module and control module, the high stability crystal oscillator output generate rate-adaptive pacemaker by down coversion mixing locking phase module
It is exported as frequency synthesizer；The frequency of the preset traction module detection frequency synthesizer output simultaneously transmits frequency information
To control module, while control module return control signal is received, provides preset voltage 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；It is characterized in that, the down coversion Mixing PLL module
It include: 4 power splitters, frequency multiplier, DDS (Direct Digital Synthesizer, Direct Digital Synthesizer), lock
Xiang Huan, loop filter, adder, VCO (voltage controlled oscillator), 2 frequency mixers, 2 symmetrical bandpass filters；High temperature crystal oscillator
Output divides two-way by the first power splitter function, wherein all the way as the reference input of phaselocked loop, another way is generated by frequency multiplier
High-frequency signal, the high-frequency signal divide two-way by the second power splitter function, wherein inputting phase with the radio frequency of the first frequency mixer all the way
Even, the another way of the second power splitter is then used as the input of DDS, and the output of DDS is connected with the local oscillator end of the second frequency mixer；Phaselocked loop
Output after loop filtering, be connected with an input of adder, adder another input preset voltage, adder
Output be 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 first frequency mixer is passed through
It is connected respectively with described 2 symmetrical bandpass filters after third power splitter, the first bandpass filter selects down converted frequencies,
Output is inputted to the second frequency mixer as radio frequency；Second bandpass filter selects up-conversion frequency, output to the 4th power splitter
Function divides two-way, wherein output of the output as frequency synthesizer, another way are then exported to preset traction module all the way；Second mixing
The output of device 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 conversion
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, is that down coversion is mixed locking phase by control module control DAC
Ring moulds block provides preset voltage.
Beneficial effects of the present invention:
Down coversion source is divided into thick frequency conversion and thin frequency conversion, and match by improving down coversion Mixing PLL structure by the present invention
Symmetrical two symmetrical band pass filters of centre frequency are closed, can achieve following effect:
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 to generate pass
In symmetrical two frequency signals of VCO output frequency: Fvco-F1, Fvco+F1；Due in thick frequency conversion, F1With FvcoGap is larger, Fvco
There can be very big bandwidth without influencing frequency selection；Balanced-filter is designed, first filter selects Fvco-F1, the second filtering
Device selects Fvco+F1, such benefit is: making full use of and is mixed for the first time, had not only reduced the phase demodulation frequency of phaselocked loop, but also not
In the case that secondary deterioration is mutually made an uproar, rate-adaptive pacemaker is improved, i.e., relative to traditional down coversion phaselocked loop, with lower phase demodulation frequency
Realize higher output.
Second of down coversion is completed at the second frequency mixer: DDS has fine stepping, can complete minimum frequency and jump
Become；Since 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 expression frequency multiplication of phase locked loop number, FddsIndicate DDS output frequency；
Its resolution ratio is determined by DDS resolution ratio；It can be seen that fine tuning mixing is independently opened, can be protected under Broadband emission
Minimum resolution is stayed, to realize the level that many wideband frequency synthesizers are not achieved.
In short, this invention simplifies designs, to realize higher rate-adaptive pacemaker and low phase noise under small size.
Further, since having many signal source and frequency content inside frequency synthesizer, there may be mistakes to lock for traditional frequency synthesizer
The case where；For this purpose, the cooperation of frequency detection module and tuning voltage preset module in the present invention then can correctly draw VCO letter
Number: frequency detector detects frequency signal to exclude the influence of temperature and environment for phaselocked loop, so that FPGA be allowed (to control mould
Block) calculate revised coarse-tuning voltage, by DAC module output be preset in adder, complete for VCO traction and
Coarse tuning, so as to avoid mistake lock；Also, exactly such voltage is preset, and the lock speed of phaselocked loop significantly improves, and realizes
Agile.
Detailed description of the invention
Fig. 1 shows the modular structure block diagram of agile low phase noise comprehensive frequency generator in broadband of the present invention；
Fig. 2 shows the process for double conversion in comprehensive frequency generator of the present invention, the processes and output of prefabricated traction
The selection of frequency；
Fig. 3 shows the specific implementation block diagram of entire frequency synthesizer, shows frequency conversion and frequency-selecting details, frequency pulling details.
Specific embodiment
The present invention is described in further details with reference to the accompanying drawings and examples.
The present embodiment provides a kind of broadband agile Low phase noise frequency synthesizer, including high stability crystal oscillator, frequency multiplication module,
DDS module, phase-locked loop module, frequency mixing module, filter module, preset traction module, frequency detection module and control module；Its
In, frequency multiplication module, phase-locked loop module, DDS module, frequency mixing module and filter module belong to down coversion Mixing PLL mould
Block；Preset traction module and frequency detection module belong to preset traction module, as shown in Figure 1.Frequency synthesizer of the invention is
The combination of down coversion Mixing PLL and preset traction twice.
In down coversion Mixing PLL, high stable crystal oscillator is subjected to frequency multiplication, locking phase, DDS sampling and mixing, thus
High-frequency to Low phase noise exports；Its implementation is: use frequency multiplier output as big stepping, DDS, which is exported, is used as small stepping, and two
Secondary lower mixing VCO frequency: phase demodulation frequency is greatly lowered in first time down coversion, in second of down coversion, is exported with DDS
Signal provides sufficiently small resolution ratio, so that the resolution ratio of phase demodulation frequency also accordingly becomes smaller, so that the N value of phaselocked loop is reduced,
Obtain lower resolution ratio.Wherein, high stability crystal oscillator is selected as 100MHz constant-temperature crystal oscillator, stability need to reach 0.001ppm with
Guarantee overall stability.It, which is exported, is divided into two-way output by the first 3dB power splitter function.Wherein pass through M frequency multiplication all the way, then
Divide two-way by the 2nd 3dB power splitter function, respectively as DDS reference and the first mixing source.The output of DDS is as the second mixing
Source is connected with the input of the second mixed device.Another way of the reference signal of phaselocked loop then from the first 3dB power splitter function point is defeated
Out.As Fig. 2 illustrates down coversion mixing twice.
In order to guarantee that phase noise and spuious performance, phaselocked loop use integer phase demodulation.Its decimal stepping is provided by DDS.It removes
Except this, higher output frequency in order to obtain does not export the frequency of VCO directly, but by the product function of first time frequency mixer
Divide output；Devised on output link with the symmetrical up-converting filter of down conversion filter in loop, thus VCO's
Output frequency is improved on the basis of output again mutually to make an uproar without secondary deterioration, final rate-adaptive pacemaker is Fo=Fvco+F1=N*
Fref+2F1+Fdds, F is higher by than traditional down coversion Mixing PLL1Frequency.
In above module, although frequency synthesis may be implemented, in view of the limitation of phaselocked loop itself, when frequency hopping
Between it is very long, and due to there is other frequency components after DDS mixing, there is the wrong risk locked in phaselocked loop, therefore devise preset lead
Draw module；Frequency detector detects frequency signal to exclude the influence of temperature and environment for phaselocked loop, so that FPGA be allowed to calculate
Revised coarse-tuning voltage out is preset in adder by DAC module output, completes the traction and coarse tuning for VCO,
So as to avoid mistake lock.In addition, exactly such voltage is preset, the lock speed of the first phaselocked loop is significantly improved, and realizes victory
Become.
FPGA module then passes through control line and is connected with down coversion Mixing PLL module and voltage preset module, mainly
Control for phaselocked loop N value is provided, the control of DDS frequency word and reading frequency information are simultaneously analyzed, to DAC controlled with
It realizes on agile and lock to right value.
The above description is merely a specific embodiment, any feature disclosed in this specification, except non-specifically
Narration, can be replaced by other alternative features that are equivalent or have similar purpose；Disclosed all features or all sides
Method or in the process the step of, other than 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, comprising: high stability crystal oscillator, down coversion Mixing PLL mould
Block, preset traction module and control module, the high stability crystal oscillator output generate rate-adaptive pacemaker by down coversion mixing locking phase module
It is exported as frequency synthesizer；The frequency of the preset traction module detection frequency synthesizer output simultaneously transmits frequency information
To control module, while control module return control signal is received, provides preset voltage 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；It is characterized in that, the down coversion Mixing PLL module
It include: 4 power splitters, frequency multiplier, DDS, phaselocked loop, loop filter, adder, VCO, 2 frequency mixers, 2 symmetrical bands
Bandpass filter；The output of high temperature crystal oscillator divides two-way by the first power splitter function, wherein all the way as the reference input of phaselocked loop, it is another
Road generates high-frequency signal by frequency multiplier, and the high-frequency signal divides two-way by the second power splitter function, wherein mixed with first all the way
The radio frequency input of frequency device is connected, and the another way of the second power splitter is then used as the input of DDS, output and the second frequency mixer of DDS
Local oscillator end is connected；The output of phaselocked loop is connected, another of adder is defeated after loop filtering with an input of adder
Enter and connect preset voltage, the output of adder 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 first frequency mixer is connected with described 2 symmetrical bandpass filters respectively after third power splitter, the filter of the first band logical
Wave device selects down converted frequencies, and output to the second frequency mixer is inputted as radio frequency；Second bandpass filter selects up-conversion
Frequency, output divide two-way to the 4th power splitter function, wherein output of the output as frequency synthesizer all the way, another way then export to
Preset traction module；The output of second frequency mixer as phase demodulation radio frequency input feedback to phaselocked loop.
2. by broadband agile low phase noise comprehensive frequency generator described in claim 1, which is characterized in that the preset traction
Module includes: frequency divider, frequency detection module and DAC, and wherein frequency divider connects the output of the 4th power splitter, the output of frequency divider
Rate of connections detection module, frequency detection module connect the control module, are down coversion mixing lock by control module control DAC
Phase ring moulds block provides preset voltage.
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| CN107483049B (en) * | 2017-09-22 | 2023-05-02 | 成都菲斯洛克电子技术有限公司 | Broadband agile 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 |
| 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 |
| 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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| CN102332914A (en) * | 2011-08-12 | 2012-01-25 | 西安天伟电子系统工程有限公司 | C-waveband frequency comprehensive generator with low phase noise |
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| US20120112806A1 (en) * | 2010-11-09 | 2012-05-10 | Sony Corporation | Frequency synthesizer and frequency synthesizing method |
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| CN101421928A (en) * | 2006-01-26 | 2009-04-29 | 日本电波工业株式会社 | VCO driving circuit and frequency synthesizer |
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| CN102651649A (en) * | 2012-03-14 | 2012-08-29 | 北京航空航天大学 | Design method of low-phase-noise microwave wideband frequency combiner |
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