CN103888134A - Frequency synthesizer capable of achieving low phase noise, low stray and quick change - Google Patents
Frequency synthesizer capable of achieving low phase noise, low stray and quick change Download PDFInfo
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- CN103888134A CN103888134A CN201410140234.6A CN201410140234A CN103888134A CN 103888134 A CN103888134 A CN 103888134A CN 201410140234 A CN201410140234 A CN 201410140234A CN 103888134 A CN103888134 A CN 103888134A
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Abstract
The invention provides a frequency synthesizer capable of achieving low phase noise, low stray and quick change. An innovative phase noise prediction method is adopted, devices are reasonably selected, and the low phase noise is achieved; by means of phase-locked loop frequency presetting and microwave switch switching, frequency is quickly changed; meanwhile, a special isolation structure is adopted, reasonable distribution of the signal amplitude in a cavity structure is utilized, and accordingly low stray of the frequency synthesizer is guaranteed. The frequency synthesizer achieving multi-frequency output meets the requirements of the low phase noise, low stray and quick change.
Description
Technical field
The present invention relates to frequency synthesizer field, relate in particular to a kind of low low spuious quick change Microwave Frequency Synthesizer of making an uproar mutually.
Background technology
Frequency synthesizer is the core component of radar and electronic equipments such as communicating by letter, and its main technical indicator comprises phase noise, spuious inhibition, frequency hopping speed etc.The height of frequency synthesizer phase noise directly determines the size of the sideband signals amplitude of emission spectrum, and the secondary lobe of high sideband signals after pulse compression can be covered dim targets detection, reduces the distance measurement performance of radar; In the time that the spurious level of frequency synthesizer is higher, can produce paired spurious signal receiving in echo, and widen main lobe width, reduce the range resolution ratio of radar; Modern radar faces complicated electromagnetic environment, and its interference free performance determines the battlefield survival of radar, and frequency agility is a kind of effectively interference protection measure, and frequency hopping speed is one of important indicator of frequency-agile radar.
The main method of current frequency synthesis has: simulate direct frequency synthesis, phase-locked loop (PLL) and Direct Digital frequency synthesis (DDS).In practical engineering application, good phase noise be can obtain with traditional Direct Digital frequency synthesis, but a large amount of mixing and frequency multiplication link needed, introduce nonlinear component, circuit complexity, spuious index is difficult to control; PLL mode can obtain higher spuious inhibition, but frequency hopping speed is conventionally in 100 s magnitudes, is difficult to meet the requirement of frequency agility; If adopt Direct Digital synthesis mode, frequency hopping speed can meet the demands, but spuious index is difficult to control.
Summary of the invention
For addressing the above problem, the invention provides a kind of low low spuious quick change Microwave Frequency Synthesizer of making an uproar mutually, comprise constant-temperature crystal oscillator, the first power splitter, the second power splitter, the first primary radar local oscillator ring, the second primary radar local oscillator ring, secondary radar local oscillator ring, modulator, amplifier, some microwave switches, the first either-or microwave switch, the second either-or microwave switch; Their annexation is:
The first power splitter input is connected with constant-temperature crystal oscillator, and output connects respectively the first primary radar local oscillator ring, the second primary radar local oscillator ring; The output of described the first primary radar local oscillator ring, the second primary radar local oscillator ring is connected on the joint of the first either-or microwave switch by a microwave switch respectively, and this first either-or microwave switch is connected with the second power splitter input again;
The second one of power splitter output is connected in turn with modulator, amplifier, output modulation signal, after a microwave switch of another output connection, connect a joint of the second either-or microwave switch, another joint of described the second either-or microwave switch is by a microwave switch connecting secondary Radar Local-oscillator ring, and described the second either-or microwave switch is exported local oscillation signal.
Further, described the first primary radar local oscillator ring, the second primary radar local oscillator ring are constructed identical: all comprise attenuator, pressure alternator, phase discriminator, loop filter, single-chip microcomputer; Described single-chip microcomputer is connected with phase discriminator input, for work control code is frequently provided; Described phase discriminator and loop filter, voltage controlled oscillator, attenuator connect and compose loop in turn, and the output of loop filter connects attenuator, and described attenuator is connected with a microwave switch.
Further, described the first primary radar local oscillator ring and/or second primary radar local oscillator ring the first primary radar local oscillator ring, the second primary radar local oscillator ring, secondary radar local oscillator ring are placed in different metal isolated chambers.
Further, also comprise the reeded parting bead of some bottoms tool, each microwave switch and/or each either-or microwave switch are placed in the groove of its corresponding parting bead.
Further, the phase noise estimated value formula of phase discriminator is:
P
N=P
floor+20logN+10logF
r
Wherein: P
nfor phase noise estimated value; P
oCXOfor the phase noise of crystal oscillator; N is frequency; P
floorfor phase discriminator phase noise floor; Fr is phase demodulation frequency.
Further, phase discriminator chip model is ADF4106.
The invention has the beneficial effects as follows:
1. realize first and second radar frequency synthesizer and merge design, changed the independently design of frequency synthesizer of traditional need two;
2. adopt the low frequency of phase locking synthesis type design of making an uproar mutually, realized higher phase noise index; It is fast frequency-hopped that primary radar local oscillator has adopted dicyclo " table tennis " pattern to switch to have realized;
3. switch by rational topology layout and suitable level, each local oscillator ring adopts independently shielding cavity, and microwave switch is fixed in parting bead, makes spuiously better to be suppressed;
4. index of the present invention is as follows: the index of making an uproar is mutually-105dBc/Hz@1KHz, and spuious inhibition is >=70dBc, frequency agility speed≤1 s.
Accompanying drawing explanation
Fig. 1 is system block diagram of the present invention.
Fig. 2 is parting bead schematic diagram of the present invention.
Embodiment
Design concept of the present invention is: by the phase noise method for predicting of innovation, choose reasonable device, realizes low phase noise; , microwave switch preset by phase-locked loop frequency switches, and realizes frequency and fast becomes; Adopt special isolation structure simultaneously, and the reasonable distribution of signal amplitude in cavity body structure, the low spuious of frequency synthesizer guaranteed.The frequency synthesizer of realizing multi-frequency output meets the requirement of the low low spuious quick change of making an uproar mutually.
Below technical scheme of the present invention is elaborated.
As shown in Figure 1, the present invention includes constant-temperature crystal oscillator, the first power splitter, the second power splitter, the first primary radar local oscillator ring, the second primary radar local oscillator ring, secondary radar local oscillator ring, modulator, amplifier, some microwave switches, the first either-or microwave switch, the second either-or microwave switch.Their annexation is:
The first power splitter input is connected with constant-temperature crystal oscillator, and output connects respectively the phase discriminator of the first primary radar local oscillator ring, the second primary radar local oscillator ring; The output of described the first primary radar local oscillator ring, the second primary radar local oscillator ring is connected on the joint of the first either-or microwave switch by a microwave switch respectively, and this first either-or microwave switch is connected with the second power splitter input again;
The second one of power splitter output is connected in turn with modulator, amplifier, output modulation signal, after a microwave switch of another output connection, connect a joint of the second either-or microwave switch, another joint of described the second either-or microwave switch is by a microwave switch connecting secondary Radar Local-oscillator ring, and described the second either-or microwave switch is exported local oscillation signal.
Described the first primary radar local oscillator ring, the second primary radar local oscillator ring are constructed identical: all comprise attenuator, pressure alternator, phase discriminator, loop filter, single-chip microcomputer; Described single-chip microcomputer is connected with phase discriminator input, for work control code is frequently provided; Described phase discriminator and loop filter, voltage controlled oscillator, attenuator connect and compose loop in turn, and the output of loop filter is also connected in turn with attenuator, a microwave switch.The microwave switch other end of described the first primary radar local oscillator ring, the second primary radar local oscillator ring is connected to first alternative and switches on microwave switch joint, this first either-or microwave switch is connected with the second power splitter input again, the second one of power splitter output is connected in turn with modulator, amplifier, output modulation signal; A joint that connects an either-or microwave switch after a microwave switch of another output connection, another joint of this either-or microwave switch is by a microwave switch connecting secondary Radar Local-oscillator ring, and this either-or microwave switch is exported local oscillation signal.
Below operation principle of the present invention is described.
First and second source has been merged in the present invention, and first and second radar receives local oscillator and switches from same port output by the second either-or microwave switch, and first and second radar emission modulation signal is switched from same port and exported by microwave switch.
Primary radar local oscillator ring and secondary radar local oscillator ring all adopt PLL(phase-locked loop or phase-locked loop) mode.
For guaranteeing the quick change of primary radar local oscillator, the present invention adopts two phase-locked loops by " table tennis mode of operation ", specific works flow process is as follows: in the time that radar is operated in the first primary radar local oscillator ring, and preset next work of the pin of the single-chip microcomputer to the second primary radar local oscillator ring control code frequently; Otherwise, in the time that radar is operated in the second primary radar local oscillator ring, preset next work of pin control code frequently of the single-chip microcomputer to the first primary radar local oscillator ring, exports microwave switch and first either-or microwave switch of two primary radar local oscillator rings and selects output, fast frequency-hopped to realize.
As another contribution to prior art, the present invention proposes new phase noise evaluation method: traditional phase noise only considers that the frequency multiplication on crystal oscillator worsens (seeing formula 1), and in the phase noise of frequency synthesizer of the present invention is estimated, for guaranteeing the low phase noise index request of this frequency synthesizer, singly do not consider the impact that traditional crystal oscillator noise floor frequency multiplication worsens, also taken the impact (seeing formula 2) of the phase noise floor frequency multiplication deterioration of the phase discriminator of synthesizer chip into consideration
P N =P
OCXO+20logN……………………..?(1)
P
N=P
floor+20logN+10logF
r……………..(2)
Wherein: P
nfor phase noise estimated value (dBc/Hz);
P
oCXOfor the phase noise (dBc/Hz) of crystal oscillator;
N is frequency;
P
floorfor phase discriminator phase noise floor (dBc/Hz);
Fr is phase demodulation frequency (Hz).
Therefore, realizing the present invention need to have under the prerequisite of constant-temperature crystal oscillator of low phase noise selecting, and also needs the phase discriminator chip of selecting noise floor lower, as ADF4106 (219dBc/Hz); In phase lock circuitry principle, the phase noise of voltage controlled oscillator only has stack to the far-end noise of frequency, and this is to be equivalent to a high pass filter based on loop filter for the noise of voltage controlled oscillator.In the present invention's design, for guaranteeing the higher phase noise index of frequency source, take into full account loop filter impact on frequency source phase noise on VCO near-end noise rejection, in voltage controlled oscillator type selecting, the phase noise of its near-end is also proposed to higher requirement, to guarantee that this frequency synthesizer meets low phase noise index request.
Because frequency synthesizer medium frequency composition is more, high spuious inhibition is also crucial.Preferably, the present invention, for reducing spurious level, meeting under the prerequisite of frequency step (10MHz) requirement, chooses maximum phase demodulation frequency (Fr:10MHz); In order to prevent crosstalking, superposeing of each frequency content, different local oscillator rings is placed in different metal isolated chambers, prevents space radiation; Simultaneously, switch from the isolation of same port output for guaranteeing first and second Radar Local-oscillator, adopt two-stage microwave switch to switch (microwave switch and the first either-or microwave switch that the first primary radar local oscillator ring is its connection, microwave switch and the first either-or microwave switch that the second primary radar local oscillator ring is its connection).Before switching, adopt small-signal as far as possible, and by each microwave switch be placed on similar as shown in Figure 2, in the reeded parting bead of bottom tool, the radiation that reduces the two ends of switching microwave switch is crosstalked.
In addition, in the present invention, for guaranteeing spuious index, also taked following measure: the one, strengthen the electric source filter circuit design of each active device, allow the power pin of filter circuit near device.When physical circuit design, at phase discriminator, VCO and microcontroller power supply pin LC filter circuit, prevent that scattered signal string assorted in each active device, around to power supply, is finally modulated on local oscillation signal, form spurious signal; The 2nd, adopt large area ground connection, reduce earth connection impedance.When printed board design, all devices are contained in the one side of double sided board, and another side is ground plane entirely, are fixed in metallic cavity, form large area ground connection; The 3rd, in the time of track layout, single-chip microcomputer control frequently waits the power line of data wire and other active device to avoid parallel cabling, and cabling adopts vertical layout, reduces low frequency signal to be crosstalked on power supply, avoid digital low frequency signal to be modulated in radiofrequency signal, form the near-end spurious signal of local oscillation signal.
Frequency synthesizer of the present invention is used to and merges the complete machine of first and second radar and transmitting modulation signal is provided and receives local oscillation signal, for complete machine provides the clock signal of coherent, internal frequency complicated component; The local oscillation signal of first and second radar is by switching from same port output, and the modulation signal of first and second radar is switched from same port and switched output by microwave microwave switch equally, and this just increases the difficulty of spuious control.
The invention has the beneficial effects as follows:
1. realize first and second radar frequency synthesizer and merge design, changed independently Design of Frequency Synthesizer of traditional need two;
2. adopt the low frequency of phase locking synthesis type design of making an uproar mutually, realized higher phase noise index; It is fast frequency-hopped that primary radar local oscillator has adopted dicyclo " table tennis " pattern to switch to have realized;
3. switch by rational topology layout and suitable level, each local oscillator ring adopts independently shielding cavity, and microwave switch is installed in fixing parting bead, makes spuiously better to be suppressed;
4. index of the present invention is as follows: the index of making an uproar is mutually-105dBc/Hz@1KHz, and spuious inhibition is >=70dBc, frequency agility speed≤1 s.
Claims (6)
1. the one kind low low spuious quick change Microwave Frequency Synthesizer of making an uproar mutually, it is characterized in that, comprise constant-temperature crystal oscillator, the first power splitter, the second power splitter, the first primary radar local oscillator ring, the second primary radar local oscillator ring, secondary radar local oscillator ring, modulator, amplifier, some microwave switches, the first either-or microwave switch, the second either-or microwave switch; Their annexation is:
The first power splitter input is connected with constant-temperature crystal oscillator, and output connects respectively the first primary radar local oscillator ring, the second primary radar local oscillator ring; The output of described the first primary radar local oscillator ring, the second primary radar local oscillator ring is connected on the joint of the first either-or microwave switch by a microwave switch respectively, and this first either-or microwave switch is connected with the second power splitter input again;
The second one of power splitter output is connected in turn with modulator, amplifier, output modulation signal, after a microwave switch of another output connection, connect a joint of the second either-or microwave switch, another joint of described the second either-or microwave switch is by a microwave switch connecting secondary Radar Local-oscillator ring, and described the second either-or microwave switch is exported local oscillation signal.
2. the low low spuious quick change Microwave Frequency Synthesizer of making an uproar mutually as claimed in claim 1, it is characterized in that, described the first primary radar local oscillator ring, the second primary radar local oscillator ring are constructed identical: all comprise attenuator, pressure alternator, phase discriminator, loop filter, single-chip microcomputer; Described single-chip microcomputer is connected with phase discriminator input, for work control code is frequently provided; Described phase discriminator and loop filter, voltage controlled oscillator, attenuator connect and compose loop in turn, and the output of loop filter connects attenuator, and described attenuator is connected with a microwave switch.
3. the low low spuious quick change Microwave Frequency Synthesizer of making an uproar mutually as claimed in claim 1 or 2, it is characterized in that, described the first primary radar local oscillator ring and/or second primary radar local oscillator ring the first primary radar local oscillator ring, the second primary radar local oscillator ring, secondary radar local oscillator ring are placed in different metal isolated chambers.
4. the low low spuious quick change Microwave Frequency Synthesizer of making an uproar mutually as claimed in claim 1 or 2, is characterized in that, also comprise the reeded parting bead of some bottoms tool, each microwave switch and/or each either-or microwave switch are placed in the groove of its corresponding parting bead.
5. the low low spuious quick change Microwave Frequency Synthesizer of making an uproar mutually as claimed in claim 1, is characterized in that, the phase noise estimated value formula of phase discriminator is:
P
N=P
floor+20logN+10logF
r
Wherein: P
nfor phase noise estimated value; P
oCXOfor the phase noise of crystal oscillator;
N is frequency; P
floorfor phase discriminator phase noise floor; Fr is phase demodulation frequency.
6. the low low spuious quick change Microwave Frequency Synthesizer of making an uproar mutually as claimed in claim 1, is characterized in that, the phase noise estimated value formula of phase discriminator is:
P
N=P
floor+20logN+10logF
r
Wherein: P
nfor phase noise estimated value; P
oCXOfor the phase noise of crystal oscillator;
N is frequency; P
floorfor phase discriminator phase noise floor; Fr is phase demodulation frequency.
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Cited By (9)
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| CN104849700A (en) * | 2015-05-07 | 2015-08-19 | 清华大学 | Software channelized coherent frequency-agile radar receiver and receiving method |
| CN105227183A (en) * | 2015-11-16 | 2016-01-06 | 中国电子科技集团公司第四十三研究所 | A kind of frequency agility rate source of low spurious |
| CN105897257A (en) * | 2016-05-13 | 2016-08-24 | 天津光电通信技术有限公司 | Frequency-extendable signal generation device and implementation method |
| CN108075771A (en) * | 2017-12-15 | 2018-05-25 | 南京熊猫电子股份有限公司 | A kind of high-performance staggered synthesizer and its frequency calculation method |
| CN108089168A (en) * | 2017-12-16 | 2018-05-29 | 贵州航天电子科技有限公司 | A kind of Echo Doppler Frequency simulator based on orthogonal modulation |
| CN108418583A (en) * | 2018-03-20 | 2018-08-17 | 西安电子工程研究所 | The thin stepping frequency agility apparatus for frequency synthesizing in broadband and method based on cascade mixing |
| CN109508477A (en) * | 2018-10-09 | 2019-03-22 | 南京沁智电子科技有限公司 | It mutually makes an uproar under a kind of vibration environment and deteriorates low clock distribution block |
| CN112422125A (en) * | 2021-01-25 | 2021-02-26 | 成都市克莱微波科技有限公司 | Agile frequency source |
| CN114070308A (en) * | 2022-01-17 | 2022-02-18 | 中国电子科技集团公司第二十九研究所 | Broadband low-phase noise frequency synthesis circuit |
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| CN108075771A (en) * | 2017-12-15 | 2018-05-25 | 南京熊猫电子股份有限公司 | A kind of high-performance staggered synthesizer and its frequency calculation method |
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| CN108089168A (en) * | 2017-12-16 | 2018-05-29 | 贵州航天电子科技有限公司 | A kind of Echo Doppler Frequency simulator based on orthogonal modulation |
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| CN108418583B (en) * | 2018-03-20 | 2021-07-16 | 西安电子工程研究所 | Broadband fine stepping frequency agility frequency synthesis device and method based on cascade frequency mixing |
| CN109508477A (en) * | 2018-10-09 | 2019-03-22 | 南京沁智电子科技有限公司 | It mutually makes an uproar under a kind of vibration environment and deteriorates low clock distribution block |
| CN109508477B (en) * | 2018-10-09 | 2023-08-18 | 南京沁智电子科技有限公司 | Clock distribution module with low phase noise degradation in vibration environment |
| CN112422125A (en) * | 2021-01-25 | 2021-02-26 | 成都市克莱微波科技有限公司 | Agile frequency source |
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Application publication date: 20140625 |