CN204180052U - The phase-locked frequency hopping synthesizer of a kind of X-band shift frequency - Google Patents
The phase-locked frequency hopping synthesizer of a kind of X-band shift frequency Download PDFInfo
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- CN204180052U CN204180052U CN201420520834.0U CN201420520834U CN204180052U CN 204180052 U CN204180052 U CN 204180052U CN 201420520834 U CN201420520834 U CN 201420520834U CN 204180052 U CN204180052 U CN 204180052U
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Abstract
The utility model relates to the phase-locked frequency hopping synthesizer of a kind of X-band shift frequency, comprise digital control circuit and radio circuit, the two shares a 80MHz crystal oscillator, described radio circuit comprises phase demodulation unit, digital control circuit output frequency division ratio controls signal to phase demodulation unit, phase demodulation unit, loop filter, voltage controlled oscillator, frequency mixer and low pass filter composition phase-locked loop, the output frequency of voltage controlled oscillator is 9260 ~ 9360MHz.The utility model is to insert frequency mixer and low pass filter in phase-locked loop, instead of the preposition fixed frquency divider of former high speed, constitute down-conversion type monocycle digital servo-control formula frequency synthesizer circuit, due to adding of frequency mixer, greatly reduce the operating frequency of frequency divider in ring, both improve the output frequency of frequency synthesizer, again reduce the phase noise of output signal.
Description
Technical field
The utility model relates to technical field of radar communication, the phase-locked frequency hopping synthesizer of especially a kind of X-band shift frequency.
Background technology
Along with the development of Radar Technology, requirements at the higher level are proposed to the frequency stability of frequency synthesizer, spectral purity, frequency range and frequency agility speed.Frequency synthesis is divided into direct modeling frequency synthesis, Phase locking frequency synthesis and direct digital synthesizers three kinds, wherein frequency synthesizer of phase locking is primarily of compositions such as phase discriminator, loop filter, voltage controlled oscillator, frequency dividers, because existing phase discriminator frequency dividing ratio when phase demodulation high-frequency signal is larger, cause the deterioration of phase noise, cause the output raising of frequency synthesis and the reduction of phase noise to condition each other, the design of high frequency Low phase noise frequency synthesizer of phase locking cannot be realized.
Utility model content
The purpose of this utility model is to provide one can improve output frequency synthesis, can reduce again the phase-locked frequency hopping synthesizer of X-band shift frequency of phase of output signal noise.
For achieving the above object, the utility model have employed following technical scheme: the phase-locked frequency hopping synthesizer of a kind of X-band shift frequency, comprise digital control circuit and radio circuit, the two shares a 80MHz crystal oscillator, described radio circuit comprises phase demodulation unit, digital control circuit output frequency division ratio controls signal to phase demodulation unit, and phase demodulation unit, loop filter, voltage controlled oscillator, frequency mixer and low pass filter composition phase-locked loop, the output frequency of voltage controlled oscillator is 9260 ~ 9360MHz.
Described digital control circuit comprises power splitter, its input is connected with 80MHz crystal oscillator, its output respectively with for exporting the wave detector of fault detection signal, the input of frequency divider is connected, frequency divider exports 20MHz signal to FPGA controller as clock signal, the input of FPGA controller is connected with toggle switch, and the output of FPGA controller is connected with phase demodulation unit.
Described phase demodulation unit adopts integrated phase lock frequency synthesis chip ADF4106, this chip is by reference divider, phase discriminator and for receive frequency dividing ratio control signal ring in frequency divider composition, the input termination 80MHz crystal oscillator of reference divider, the output of reference divider is connected with the input of phase discriminator, the output of phase discriminator is connected with the input of loop filter, the output of loop filter is connected with the input of voltage controlled oscillator, first output of voltage controlled oscillator exports the frequency synthesis of 9260 ~ 9360MHz, second output of voltage controlled oscillator exports two divided-frequency signal to frequency mixer, 80MHz crystal oscillation signal produces 4GHz signal to frequency mixer through push-push multiplier and two-stage bandpass filter, two divided-frequency signal and 4GHz signal down-conversion in frequency mixer, the output of frequency mixer is connected with the input of low pass filter, the output of low pass filter is connected with the input of frequency divider in ring, in ring, the output of frequency divider is connected with the input of phase discriminator, phase discriminator, loop filter, voltage controlled oscillator, frequency mixer, frequency divider composition phase-locked loop in low pass filter and ring.
Described push-push multiplier is the first frequency multiplier and the second frequency multiplier, described two-stage bandpass filter is the first band pass filter and the second band pass filter, the input termination 80MHz crystal oscillator of the first frequency multiplier, the output of the first frequency multiplier is connected with the input of the first band pass filter, the output of the first band pass filter is connected with the input of the second frequency multiplier, the output of the second frequency multiplier is connected with the input of the second band pass filter, and the output of the second band pass filter is connected with frequency mixer.
Described FPGA controller adopts chip EP1C3T100I7, and described voltage controlled oscillator adopts HMC511LP5 chip.
It is 4630 ~ 4680MHz that second output of described voltage controlled oscillator exports two divided-frequency signal frequency, and it is 630MHz ~ 680MHz that frequency mixer down-conversion produces signal frequency.
Described first band pass filter is 400MHz band pass filter, and the second band pass filter is 4GHz band pass filter.
As shown from the above technical solution, the utility model is to insert frequency mixer and low pass filter in phase-locked loop, instead of the preposition fixed frquency divider of former high speed, constitute down-conversion type monocycle digital servo-control formula frequency synthesizer circuit, due to adding of frequency mixer, greatly reduce the operating frequency of frequency divider in ring, both improve the output frequency of frequency synthesizer, again reduce the phase noise of output signal; Adopt large-scale integrated PLL frequency synthesizer ADF4106, design and made the bandwidth agility scheme synthesizer that has the X-band of multiple frequency, this frequency synthesizer has been successfully applied to certain type radar, radiofrequency signal static state is made an uproar-95dBc/Hz@1kHz mutually, power+5dBm, spuious-75dBc, state meets system requirements and operational excellence.
Accompanying drawing explanation
Fig. 1 is circuit block diagram of the present utility model.
Fig. 2 is Control timing sequence analogous diagram of the present utility model.
Embodiment
The phase-locked frequency hopping synthesizer of a kind of X-band shift frequency, comprise digital control circuit 1 and radio circuit 2, the two shares a 80MHz crystal oscillator, described radio circuit 2 comprises phase demodulation unit 3, digital control circuit 1 output frequency division ratio controls signal to phase demodulation unit 3, phase demodulation unit 3, loop filter, voltage controlled oscillator, frequency mixer 5 and low pass filter 4 form phase-locked loop, the output frequency of voltage controlled oscillator is 9260 ~ 9360MHz, as shown in Figure 1, the reference clock of whole synthesizer adopts 80M constant-temperature crystal oscillator, + 12V powers, phase noise-155dBc/Hz@100KHz.
As shown in Figure 1, described digital control circuit 1 comprises power splitter, its input is connected with 80MHz crystal oscillator, its output respectively with for exporting the wave detector of fault detection signal, the input of frequency divider is connected, frequency divider exports 20MHz signal to FPGA controller as clock signal, the input of FPGA controller is connected with toggle switch, and the output of FPGA controller is connected with phase demodulation unit 3, and described FPGA controller adopts chip EP1C3T100I7.Crystal oscillator produces 80MHz reference signal and is divided into two paths of signals through power splitter, one tunnel is divided into 20MHz signal to give FPGA controller through frequency divider 74F74SC making clock signal, control FPGA controller by the toggle switch of outside and export control signal, deliver to ADF4106 chip and change frequency dividing ratio; Whether another road 80MHz signal carries out fault detect BITE output after wave detector, namely detect 80MHz reference signal and normally work.
As shown in Figure 1, described phase demodulation unit 3 adopts integrated phase lock frequency synthesis chip ADF4106, this chip is by reference divider, phase discriminator and for receive frequency dividing ratio control signal ring in frequency divider composition, the input termination 80MHz crystal oscillator of reference divider, the output of reference divider is connected with the input of phase discriminator, the output of phase discriminator is connected with the input of loop filter, the output of loop filter is connected with the input of voltage controlled oscillator, first output of voltage controlled oscillator exports the frequency synthesis of 9260 ~ 9360MHz, second output of voltage controlled oscillator exports two divided-frequency signal to frequency mixer 5, 80MHz crystal oscillation signal produces 4GHz signal to frequency mixer 5 through push-push multiplier and two-stage bandpass filter, two divided-frequency signal and 4GHz signal down-conversion in frequency mixer 5, the output of frequency mixer 5 is connected with the input of low pass filter 4, the output of low pass filter 4 is connected with the input of frequency divider in ring, in ring, the output of frequency divider is connected with the input of phase discriminator, phase discriminator, loop filter, voltage controlled oscillator, frequency mixer 5, frequency divider composition phase-locked loop in low pass filter 4 and ring.It is 4630 ~ 4680MHz that second output of described voltage controlled oscillator exports two divided-frequency signal frequency, and it is 630MHz ~ 680MHz that frequency mixer 5 down-conversion produces signal frequency.
As shown in Figure 1, the ADF4106 integrated chip multiple vitals of phase-locked loop frequency synthesizer, only need simple peripheral circuit, the very high frequency synthesizer of reliability of a complete low noise, low-power consumption, high stability can be formed, its simplicity of design is flexible, and be easy to reduce system bulk, ADF4106 chip has the ultra wide bandwidth of 6GHz, works under 2.7 ~ 3.3V Power supply.Voltage controlled oscillator uses chip HMC511LP5, this chip+5V single power supply, and built-in chip type removes 2 frequency dividers, output frequency: FO=9.05-10.15GHz; F/2=4.525-5.075 GHz; Power output+13dBm; Phase noise-115dBc/Hz@100KHz.Loop filter adopts active loop filtering mode to carry out filtering, uses the devices such as OP27GS operational amplifier, effectively raise the stability of loop bandwidth and loop in circuit.The 80MHz that crystal oscillator produces sends into ADF4106 chip, after built-in reference divider, carry out phase demodulation with loop feedback signal; Produce calibration voltage by phase discriminator after loop filter, send into voltage controlled oscillator generation output frequency; Meanwhile, another road 80MHz reference signal produces 4GHz signal by push-push multiplier and two-stage bandpass filter, sends into the two divided-frequency output signal of frequency mixer to voltage controlled oscillator and carries out down-conversion; Frequency mixer down-conversion generation 630MHz ~ 680MHz delivers to phase discriminator after frequency divider in low pass filter and ring and reference signal carries out phase demodulation; After loop-locking, by frequency divider frequency dividing ratio in digital control circuit 1 control ring, final output 10MHz stepped-frequency interval one local oscillation signal 9260 ~ 9360MHz.When there is error in the signal that frequency divider exports in the 5M signal that reference divider exports and ring, the output frequency of voltage controlled oscillator also can depart from 9260 ~ 9360MHz, therefore, go to regulate by the toggle switch of outside, make the output frequency of frequency divider in last ring equal 5V, the output frequency of final voltage controlled oscillator is 9260 ~ 9360MHz.
As shown in Figure 1, described push-push multiplier is the first frequency multiplier and the second frequency multiplier, described two-stage bandpass filter is the first band pass filter and the second band pass filter, the input termination 80MHz crystal oscillator of the first frequency multiplier, the output of the first frequency multiplier is connected with the input of the first band pass filter, the output of the first band pass filter is connected with the input of the second frequency multiplier, the output of the second frequency multiplier is connected with the input of the second band pass filter, and the output of the second band pass filter is connected with frequency mixer 5.Described first band pass filter is 400MHz band pass filter, and the second band pass filter is 4GHz band pass filter.
As shown in Figure 2, FPGA controller works when CP rising edge clock signal triggers, and changes the operating state of ADF4106 chip by exporting CLK, LE, DATA signal, controls output frequency.
In sum, the utility model is to insert frequency mixer and low pass filter in phase-locked loop, instead of the preposition fixed frquency divider of former high speed, constitute down-conversion type monocycle digital servo-control formula frequency synthesizer circuit, due to adding of frequency mixer, greatly reduce the operating frequency of frequency divider in ring, both improve the output frequency of frequency synthesizer, again reduce the phase noise of output signal.
Claims (7)
1. the phase-locked frequency hopping synthesizer of X-band shift frequency, comprise digital control circuit (1) and radio circuit (2), the two shares a 80MHz crystal oscillator, it is characterized in that: described radio circuit (2) comprises phase demodulation unit (3), digital control circuit (1) output frequency division ratio controls signal to phase demodulation unit (3), phase demodulation unit (3), loop filter, voltage controlled oscillator, frequency mixer (5) and low pass filter (4) composition phase-locked loop, the output frequency of voltage controlled oscillator is 9260 ~ 9360MHz.
2. the phase-locked frequency hopping synthesizer of a kind of X-band shift frequency according to claim 1, it is characterized in that: described digital control circuit (1) comprises power splitter, its input is connected with 80MHz crystal oscillator, its output respectively with for exporting the wave detector of fault detection signal, the input of frequency divider is connected, frequency divider exports 20MHz signal to FPGA controller as clock signal, the input of FPGA controller is connected with toggle switch, and the output of FPGA controller is connected with phase demodulation unit (3).
3. the phase-locked frequency hopping synthesizer of a kind of X-band shift frequency according to claim 1, it is characterized in that: described phase demodulation unit (3) adopts integrated phase lock frequency synthesis chip ADF4106, this chip is by reference divider, phase discriminator and for receive frequency dividing ratio control signal ring in frequency divider composition, the input termination 80MHz crystal oscillator of reference divider, the output of reference divider is connected with the input of phase discriminator, the output of phase discriminator is connected with the input of loop filter, the output of loop filter is connected with the input of voltage controlled oscillator, first output of voltage controlled oscillator exports the frequency synthesis of 9260 ~ 9360MHz, second output of voltage controlled oscillator exports two divided-frequency signal to frequency mixer (5), 80MHz crystal oscillation signal produces 4GHz signal to frequency mixer (5) through push-push multiplier and two-stage bandpass filter, two divided-frequency signal and 4GHz signal down-conversion in frequency mixer (5), the output of frequency mixer (5) is connected with the input of low pass filter (4), the output of low pass filter (4) is connected with the input of frequency divider in ring, in ring, the output of frequency divider is connected with the input of phase discriminator, phase discriminator, loop filter, voltage controlled oscillator, frequency mixer (5), frequency divider composition phase-locked loop in low pass filter (4) and ring.
4. the phase-locked frequency hopping synthesizer of a kind of X-band shift frequency according to claim 3, it is characterized in that: described push-push multiplier is the first frequency multiplier and the second frequency multiplier, described two-stage bandpass filter is the first band pass filter and the second band pass filter, the input termination 80MHz crystal oscillator of the first frequency multiplier, the output of the first frequency multiplier is connected with the input of the first band pass filter, the output of the first band pass filter is connected with the input of the second frequency multiplier, the output of the second frequency multiplier is connected with the input of the second band pass filter, the output of the second band pass filter is connected with frequency mixer (5).
5. the phase-locked frequency hopping synthesizer of a kind of X-band shift frequency according to claim 2, is characterized in that: described FPGA controller adopts chip EP1C3T100I7, and described voltage controlled oscillator adopts HMC511LP5 chip.
6. the phase-locked frequency hopping synthesizer of a kind of X-band shift frequency according to claim 3, it is characterized in that: it is 4630 ~ 4680MHz that the second output of described voltage controlled oscillator exports two divided-frequency signal frequency, and it is 630MHz ~ 680MHz that frequency mixer (5) down-conversion produces signal frequency.
7. the phase-locked frequency hopping synthesizer of a kind of X-band shift frequency according to claim 4, it is characterized in that: described first band pass filter is 400MHz band pass filter, the second band pass filter is 4GHz band pass filter.
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| CN104682955A (en) * | 2015-03-02 | 2015-06-03 | 成都宝通天宇电子科技有限公司 | Frequency-mixed phase-locking high phase-noise broadband microwave source |
| CN104993821A (en) * | 2015-07-09 | 2015-10-21 | 宁波成电泰克电子信息技术发展有限公司 | Low phase noise phase-locked loop circuit |
| CN105306080A (en) * | 2015-11-30 | 2016-02-03 | 上海航天测控通信研究所 | X-band satellite-borne phase-locked receiver |
| CN105577182A (en) * | 2015-12-15 | 2016-05-11 | 成都九洲迪飞科技有限责任公司 | W-band low phase noise phase-locked source and use method thereof |
| CN105634482A (en) * | 2015-12-28 | 2016-06-01 | 北京遥测技术研究所 | Satellite SRD-based frequency multiplication phase locking frequency source |
| CN106571817A (en) * | 2016-11-10 | 2017-04-19 | 电子科技大学 | Wide-band agile low-phase noise frequency integrated generator |
| CN106788421A (en) * | 2016-12-30 | 2017-05-31 | 陕西烽火电子股份有限公司 | A kind of frequency synthesizer |
| CN106849969A (en) * | 2016-12-29 | 2017-06-13 | 中国电子科技集团公司第二十七研究所 | The K-band frequency synthesizer that a kind of aerospace electron is scouted in Five-channel receiver |
| CN106899293A (en) * | 2017-03-13 | 2017-06-27 | 广州海格通信集团股份有限公司 | Frequency synthesizer |
| CN107925413A (en) * | 2016-08-05 | 2018-04-17 | 亚库蒂尔·约瑟夫斯伯格 | Ultralow phase noise frequency synthesizer |
| CN108169720A (en) * | 2018-02-08 | 2018-06-15 | 上海广电通信技术有限公司 | X-band low phase noise navigation frequency modulated continuous wave radar emission system |
| CN108494398A (en) * | 2018-03-30 | 2018-09-04 | 广东圣大电子有限公司 | A kind of design method and source of X-band ultralow phase noise frequency source |
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- 2014-09-12 CN CN201420520834.0U patent/CN204180052U/en not_active Expired - Fee Related
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104682955A (en) * | 2015-03-02 | 2015-06-03 | 成都宝通天宇电子科技有限公司 | Frequency-mixed phase-locking high phase-noise broadband microwave source |
| CN104993821A (en) * | 2015-07-09 | 2015-10-21 | 宁波成电泰克电子信息技术发展有限公司 | Low phase noise phase-locked loop circuit |
| CN105306080A (en) * | 2015-11-30 | 2016-02-03 | 上海航天测控通信研究所 | X-band satellite-borne phase-locked receiver |
| CN105306080B (en) * | 2015-11-30 | 2017-08-25 | 上海航天测控通信研究所 | A kind of spaceborne phase-locked receive of X frequency ranges |
| CN105577182B (en) * | 2015-12-15 | 2019-04-16 | 成都九洲迪飞科技有限责任公司 | W-waveband Low phase noise phase locked source and its application method |
| CN105577182A (en) * | 2015-12-15 | 2016-05-11 | 成都九洲迪飞科技有限责任公司 | W-band low phase noise phase-locked source and use method thereof |
| CN105634482A (en) * | 2015-12-28 | 2016-06-01 | 北京遥测技术研究所 | Satellite SRD-based frequency multiplication phase locking frequency source |
| CN107925413A (en) * | 2016-08-05 | 2018-04-17 | 亚库蒂尔·约瑟夫斯伯格 | Ultralow phase noise frequency synthesizer |
| CN106571817A (en) * | 2016-11-10 | 2017-04-19 | 电子科技大学 | Wide-band agile low-phase noise frequency integrated generator |
| CN106571817B (en) * | 2016-11-10 | 2019-11-05 | 电子科技大学 | A kind of broadband agile low phase noise comprehensive frequency generator |
| CN106849969A (en) * | 2016-12-29 | 2017-06-13 | 中国电子科技集团公司第二十七研究所 | The K-band frequency synthesizer that a kind of aerospace electron is scouted in Five-channel receiver |
| CN106788421A (en) * | 2016-12-30 | 2017-05-31 | 陕西烽火电子股份有限公司 | A kind of frequency synthesizer |
| CN106899293A (en) * | 2017-03-13 | 2017-06-27 | 广州海格通信集团股份有限公司 | Frequency synthesizer |
| CN108169720A (en) * | 2018-02-08 | 2018-06-15 | 上海广电通信技术有限公司 | X-band low phase noise navigation frequency modulated continuous wave radar emission system |
| CN108169720B (en) * | 2018-02-08 | 2024-01-05 | 上海广电通信技术有限公司 | X-band low-phase noise navigation frequency modulation continuous wave radar transmitting system |
| CN108494398A (en) * | 2018-03-30 | 2018-09-04 | 广东圣大电子有限公司 | A kind of design method and source of X-band ultralow phase noise frequency source |
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Granted publication date: 20150225 Termination date: 20200912 |