CN108512549A - A kind of Frequency Hopping Synthesizer - Google Patents
A kind of Frequency Hopping Synthesizer Download PDFInfo
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- CN108512549A CN108512549A CN201810581406.1A CN201810581406A CN108512549A CN 108512549 A CN108512549 A CN 108512549A CN 201810581406 A CN201810581406 A CN 201810581406A CN 108512549 A CN108512549 A CN 108512549A
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- 230000003321 amplification Effects 0.000 claims abstract description 116
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 116
- 230000011664 signaling Effects 0.000 claims abstract description 16
- 230000006870 function Effects 0.000 claims description 20
- 238000007493 shaping process Methods 0.000 claims description 15
- 230000009131 signaling function Effects 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 6
- 230000003993 interaction Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 7
- 230000017525 heat dissipation Effects 0.000 abstract description 7
- 238000002955 isolation Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 5
- 238000004891 communication Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000306 component Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 208000002925 dental caries Diseases 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Classifications
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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
- H03L7/08—Details of the phase-locked loop
- H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
- H03L7/093—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal using special filtering or amplification characteristics in the loop
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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
- H03L7/08—Details of the phase-locked loop
- H03L7/10—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range
- H03L7/107—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using a variable transfer function for the loop, e.g. low pass filter having a variable bandwidth
- H03L7/1075—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using a variable transfer function for the loop, e.g. low pass filter having a variable bandwidth by changing characteristics of the loop filter, e.g. changing the gain, changing the bandwidth
Abstract
The present invention provides a kind of Frequency Hopping Synthesizers, including cavity；It is equipped with Channel Elements in the cavity, cover board is equipped on cavity, the both sides of cavity are externally provided with power supply and control signaling interface and radiofrequency signal output interface；The Channel Elements are connect with power supply and control signaling interface and radiofrequency signal output interface respectively；It is equipped with amplification module III, DDS module, frequency division module in the Channel Elements, bandpass filter and amplitude limiter circuit are equipped in amplification module III, DDS chips are equipped in DDS module, frequency divider is equipped in frequency division module.The present invention uses double-layer shielding structure, each module is embedded in cavity and installs minor flaps additional, then large cover is installed additional again, form double layer screen, in this way while improving electromagnet shield effect and each module isolation, heat dissipation effect is also improved, the heat dissipation problem between each module printed board is efficiently solved.
Description
Technical field
The present invention relates to a kind of Frequency Hopping Synthesizers, belong to wireless communication Hopping frequencies technical field.
Background technology
Frequency synthesizer is one of the key core component technology in frequency-hopping communication system, but frequency synthesizer be related to it is a variety of
Frequency, easy tos produce a variety of harmonic waves, and frequency switching time, frequency resolution, frequency range and output factors directly affect
The interference free performance of High-speed frequency hopping communication system and the stability of system, reliability etc., however, the locking time of frequency synthesizer
It is mutually restricted with other technical indicators.
A variety of methods are provided to the spurious reduction ability of frequency synthesizer in the prior art, such as application No. is
A kind of loop filter of rapid wideband frequency hopping source module, the device disclosed in 201510963419.1 Chinese patent pass through
Increase switched resistor network, clamper loop filter output voltage, and increases loop current to realize spurious reduction performance, reduce
Looped phase locking time and increase frequency hopping synthesizer frequency hopping speed, but it is bad bad with spurious reduction to remain heat dissipation in that patent
The problems such as.
Invention content
In order to solve the above technical problems, the present invention provides a kind of Frequency Hopping Synthesizer, which carries
High spurious reduction ability, ensure that accurate frequency accuracy, low phase noise and wide frequency range.
The present invention is achieved by the following technical programs.
A kind of Frequency Hopping Synthesizer provided by the invention, including cavity；Channel Elements are equipped in the cavity, in cavity
It is equipped with cover board, the both sides of cavity are externally provided with power supply and control signaling interface and radiofrequency signal output interface；The channel
Unit is connect with power supply and control signaling interface and radiofrequency signal output interface respectively；Amplification module is equipped in the Channel Elements
III, DDS module, frequency division module, amplification module III is interior to be equipped with bandpass filter and shaping circuit, and DDS cores are equipped in DDS module
Piece, frequency division module is interior to be equipped with frequency divider；The bandpass filter completes the function of DDS output sinusoidal clock waveform filtering, using 7
Rank elliptic filter；The shaping circuit completes sinusoidal clock shaping, exports square-wave signal function.
Institute's Channel Elements further include interface module, phase demodulation module, amplification module II, VCO modules, amplification module I, output mould
Block, interface module, phase demodulation module, amplification module III, DDS module, amplification module II, frequency division module, VCO modules, amplification module
I, output module is inlayed in the cavity successively；The phase demodulation module, amplification module III, DDS module, amplification module II, frequency dividing mould
Block, VCO modules, amplification module I, output module are connect by interface module with power supply and control signaling interface；The phase demodulation
Module, amplification module III, DDS module, amplification module II, frequency division module, VCO modules, amplification module I, output module connect successively
It connects；The phase demodulation module, amplification module III, DDS module, amplification module II, frequency division module, VCO modules, amplification module I, output
Module is connect with radiofrequency signal output interface.
The cavity and cover board are double-layer shielding structure, form double electromagnetic shielding cavity.
The interface module, phase demodulation module, amplification module III, DDS module, amplification module II, frequency division module, VCO modules,
Amplification module I, output module are independently mounted in double electromagnetic shielding cavity.
The interface module is for completing and host power supply, control signal interaction and signaling transfer point；The phase demodulation module is used
In completion backfeed loop frequency signal and reference clock signal phase discrimination function；The amplification module III is defeated for completing DDS module
Go out frequency signal enlarging function；The DDS module is used to generate frequency signal function according to frequency control word；The amplification module
II for completing feedback frequency divided signal enlarging function；The frequency division module is for completing feedback frequency division function；Institute
State VCO modules for complete required frequency signal function generated according to driving voltage；The amplification module I is for completing VCO moulds
The enlarging function of block output frequency signal；The output module is for completing local frequency filter function.
The phase demodulation module, amplification module III, DDS module, amplification module II, frequency division module, VCO modules, amplification module
I, it is sequentially connected by radiofrequency signal between output module；The interface module, phase demodulation module, amplification module III, DDS module,
Amplification module II, frequency division module, VCO modules, amplification module I, output module are exported by EMI punchings filter and radiofrequency signal
Interface connects.
The interface module, phase demodulation module, amplification module III, DDS module, amplification module II, frequency division module, VCO modules,
Amplification module I, output module are arranged in the printed board of FRA materials, one side not mounting related components of the printed board close to cavity.
The one side of the printed board close to cavity is coated with group layer, and the cavity of printed board close to the one side of cavity is connect
Ground.
The phase demodulation module, amplification module III, DDS module, amplification module II, frequency division module, VCO modules, amplification module
I, it is sequentially connected using radio-frequency cable between output module, the radio-frequency cable is all made of to be penetrated without the semi-rigid of insulating outer protective cover
Frequency cable.
It is equipped with clock source, phase discriminator and loop filter in the phase demodulation module, amplifier is equipped in amplification module II,
It is equipped with voltage controlled oscillator in VCO modules, output filter is equipped in output module.
The beneficial effects of the present invention are：
1. using double-layer shielding structure, each module is embedded in cavity and is installed additional minor flaps, then installs big lid additional again
Plate forms double layer screen, in this way while improving electromagnet shield effect and each module isolation, also improves heat dissipation effect,
Efficiently solve the heat dissipation problem between each module printed board；
2. not only having met fast frequency-hopped response but also smaller spuious, the accurate frequency accuracy of guarantee, low phase noise and width
Frequency range；
3. the cavity large area ground connection of the corresponding mounting surface of each module printed board, increases module printed board contact area, has
Effect solves module and the Electro Magnetic Compatibility of module-cascade.
Description of the drawings
Fig. 1 is the structural schematic diagram of the present invention；
Fig. 2 is the fundamental diagram of the present invention；
Fig. 3 is DDS control timing diagrams of the present invention；
Fig. 4 is the schematic diagram of bandpass filter of the present invention；
Fig. 5 is the schematic diagram of shaping circuit of the present invention；
In figure：1- interface modules, 2- phase demodulation modules, 3- amplification modules III, 4-DDS modules, 5- amplification modules II, 6- frequency dividings
Module, 7-VCO modules, 8- amplification modules I, 9- output modules, 10- power supplys and control signaling interface, the output of 11- radiofrequency signals connect
Mouthful, 12- cavitys, 13- cover boards.
Specific implementation mode
Be described further below technical scheme of the present invention, but claimed range be not limited to it is described.
As shown in Figure 1, a kind of Frequency Hopping Synthesizer, including cavity 12；Channel Elements are equipped in the cavity 12, in chamber
Body 12 is equipped with cover board 13, and the both sides of cavity 12 are externally provided with power supply and control signaling interface 10 and radiofrequency signal output interface
11；The Channel Elements are connect with power supply and control signaling interface 10 and radiofrequency signal output interface 11 respectively；The channel list
It is equipped with amplification module III 3, DDS module 4, frequency division module 6 in first, bandpass filter (as shown in Figure 4) is equipped in amplification module III 3
With shaping circuit (as shown in Figure 5), any type in the prior art, institute can be used in the bandpass filter and shaping circuit
State the OUT terminal connection of the OUT terminal and bandpass filter in shaping circuit, the ends IN at the ends IN and bandpass filter in shaping circuit
Connection, DDS module 4 is interior to be equipped with DDS chips, and frequency divider is equipped in frequency division module 6；The model of the DDS chips
AD9854ASQ。
The bandpass filter completes the function of DDS output sinusoidal clock waveform filtering, is designed using 7 rank elliptic filters
It forms, is separately connected with DDS module 4 and shaping circuit 3.
The shaping circuit completes sinusoidal clock shaping, square-wave signal function is exported, using SM5009AL1 chips and periphery
Capacitor forms, as shown in Figure 5.
Institute's Channel Elements further include interface module 1, phase demodulation module 2, amplification module II 5, VCO modules 7, amplification module I 8,
Output module 9, interface module 1, phase demodulation module 2, amplification module III 3, DDS module 4, amplification module II 5, frequency division module 6, VCO
Module 7, amplification module I 8, output module 9 are embedded in successively in cavity 12；The phase demodulation module 2, amplification module III 3, DDS moulds
Block 4, amplification module II 5, frequency division module 6, VCO modules 7, amplification module I 8, output module 9 pass through interface module 1 and power supply
And control signaling interface 10 connects；The phase demodulation module 2, amplification module III 3, DDS module 4, amplification module II 5, frequency division module
6, VCO modules 7, amplification module I 8, output module 9 are sequentially connected；The phase demodulation module 2, DDS module 4, is put amplification module III 3
Big module II 5, frequency division module 6, VCO modules 7, amplification module I 8, output module 9 are connect with radiofrequency signal output interface 11.
The cavity 12 and cover board 13 are double-layer shielding structure, effectively improve Frequency Hopping Synthesizer spurious reduction energy
Power also improves heat dissipation effect while improving electromagnet shield effect and each module isolation, forms double electromagnetic shielding cavity
Body.
The interface module 1, phase demodulation module 2, amplification module III 3, DDS module 4, amplification module II 5, frequency division module 6,
VCO modules 7, amplification module I 8, output module 9 are independently mounted in double electromagnetic shielding cavity.
The interface module 1 is for completing and host power supply, control signal interaction and signaling transfer point；The phase demodulation module 2
For completing backfeed loop frequency signal and reference clock signal phase discrimination function；The amplification module III 3 is for completing DDS module
4 output frequency signals amplify filter shape function；The DDS module 4 is used to generate frequency signal function according to frequency control word；
The amplification module II 5 is for completing feedback frequency divided signal enlarging function；The frequency division module 6 is for completing feedback frequency
Rate division function；The VCO modules 7 generate required frequency signal function for completing according to driving voltage；The amplification module I
8 enlarging function for completing 7 output frequency signal of VCO modules；The output module 9 is for completing local frequency filtering work(
Energy.
The phase demodulation module 2, DDS module 4, amplification module II 5, frequency division module 6, VCO modules 7, is put amplification module III 3
It is sequentially connected by radiofrequency signal between module I 8, output module 9 greatly；The interface module 1, phase demodulation module 2, amplification module III
3, DDS module 4, amplification module II 5, frequency division module 6, VCO modules 7, amplification module I 8, output module 9 are worn by microminiature EMI
Heart filter is connect with radiofrequency signal output interface 11.
The interface module 1, phase demodulation module 2, amplification module III 3, DDS module 4, amplification module II 5, frequency division module 6,
VCO modules 7, amplification module I 8, output module 9 are arranged in the printed board of FRA materials, printed board close to cavity 12 one side not
Mounting related components.
The one side of the printed board close to cavity 12 is coated with group layer, and the heating element heat in each printed board passes through
Printed board solder mask is transferred to 12 mounting surface of cavity, then is transferred to Channel Elements, efficiently solves the heat dissipation problem of each printed board,
And the cavity 12 of printed board close to the one side of cavity 12 is grounded, increase printed board contact area, what is effectively solved solves module
And module-cascade Electro Magnetic Compatibility.
The phase demodulation module 2, DDS module 4, amplification module II 5, frequency division module 6, VCO modules 7, is put amplification module III 3
It is sequentially connected using radio-frequency cable between module I 8, output module 9 greatly, the radio-frequency cable is all made of without insulating outer protective cover
Semi-rigid radio-frequency cable, it is ensured that between radio-frequency cable external shielding layer and conductive trough adequately grounded, improve Electro Magnetic Compatibility.
It is equipped with clock source, phase discriminator and loop filter in the phase demodulation module 2, amplifier is equipped in amplification module II 5,
It is equipped with voltage controlled oscillator in VCO modules 7, output filter is equipped in output module 9.
Further, working principle of the present invention is as follows：
The power supply and control signal that host provides are transferred to interface module 1 by power supply and control signaling interface 10, pass through
Interface module 1 is transmitted to phase demodulation module 2, amplification module I 8, amplification module II 5, amplification module III 3, DDS module 4, VCO modules
7, frequency division module 6, output module 9, then each module start-up operation, as shown in Figure 2.The sequential of host according to Fig.3, is sent out
Frequency control signal be transmitted to the DDS chips in DDS module 4 through interface module 1, DDS chips in DDS module 4 generate phase
The frequency answered is sent to phase demodulation module 2 and reference clock after the amplification of amplification module III 3, filtering, shaping and is carried out at phase demodulation and filtering
The signal of reason, phase demodulation is sent to the local frequency needed for the voltage controlled oscillator generation host in VCO modules 7, and VCO modules 7 receive production
Raw local frequency simultaneously breaks it into two, and is sent after the amplification of amplification module I 8 is sent to output module 9 and is filtered all the way
To receiver or transmitter, another way sent after the amplification of amplification module II 5 after being divided as the divided module 6 of feedback frequency to
DDS module.
In conclusion the present invention provides it is a kind of meet frequency switching time is short, frequency resolution is high, output phase connect
Continue, phase noise is ultralow, frequency spectrum clarity superelevation, the Frequency Hopping Synthesizer for controlling flexible and convenient quick response, frequency
Synthetic technology uses PLL (phaselocked loop)+DDS Direct Digitals, adapts to fast frequency-hopped, meets jamproof want
It asks, moreover it is possible to which locking time quickly such as a few microseconds ensure smaller spuious, accurate frequency accuracy, low to tens microseconds
Phase noise and wide frequency range.
Claims (10)
1. a kind of Frequency Hopping Synthesizer, including cavity (12), it is characterised in that：Channel Elements are equipped in the cavity (12),
Cover board (13) is equipped on cavity (12), the both sides of cavity (12) are externally provided with power supply and control signaling interface (10) and radio frequency
Signal output interface (11)；The Channel Elements respectively with power supply and control signaling interface (10) and radiofrequency signal output interface
(11) it connects；Amplification module III (3), DDS module (4), frequency division module (6), amplification module III (3) are equipped in the Channel Elements
It is interior to be equipped with bandpass filter and shaping circuit；It is equipped with DDS chips in DDS module (4), frequency divider is equipped in frequency division module (6)；Institute
The function that bandpass filter completes DDS output sinusoidal clock waveform filtering is stated, using 7 rank elliptic filters；The shaping circuit
Sinusoidal clock shaping is completed, square-wave signal function is exported.
2. Frequency Hopping Synthesizer as described in claim 1, it is characterised in that：Institute's Channel Elements further include interface module (1),
Phase demodulation module (2), amplification module II (5), VCO modules (7), amplification module I (8), output module (9), interface module (1), mirror
Phase module (2), amplification module III (3), DDS module (4), amplification module II (5), frequency division module (6), VCO modules (7), amplification
Module I (8), output module (9) are embedded in successively in cavity (12)；The phase demodulation module (2), amplification module III (3), DDS moulds
Block (4), amplification module II (5), frequency division module (6), VCO modules (7), amplification module I (8), output module (9) pass through interface
Module (1) is connect with power supply and control signaling interface (10)；The phase demodulation module (2), amplification module III (3), DDS module (4),
Amplification module II (5), frequency division module (6), VCO modules (7), amplification module I (8), output module (9) are sequentially connected；The mirror
Phase module (2), amplification module III (3), DDS module (4), amplification module II (5), frequency division module (6), VCO modules (7), amplification
Module I (8), output module (9) are connect with radiofrequency signal output interface (11).
3. Frequency Hopping Synthesizer as described in claim 1, it is characterised in that：The cavity (12) and cover board (13) are double
Layer shielding construction, forms double electromagnetic shielding cavity.
4. Frequency Hopping Synthesizer as claimed in claim 3, it is characterised in that：The interface module (1), phase demodulation module (2),
It is amplification module III (3), DDS module (4), amplification module II (5), frequency division module (6), VCO modules (7), amplification module I (8), defeated
Go out module (9) to be independently mounted in double electromagnetic shielding cavity.
5. Frequency Hopping Synthesizer as claimed in claim 2, it is characterised in that：The interface module (1) is for completing and master
Electromechanical source, control signal interaction and signaling transfer point；When the phase demodulation module (2) is for completing backfeed loop frequency signal with reference
Clock signal phase discrimination function；The amplification module III (3) is for completing DDS module (4) output frequency signal enlarging function；It is described
DDS module (4) is used to generate frequency signal function according to frequency control word；The amplification module II (5) is for completing feedback frequency
Rate divided signal enlarging function；The frequency division module (6) is for completing feedback frequency division function；The VCO modules (7) are used
Required frequency signal function is generated according to driving voltage in completion；The amplification module I (8) is for completing VCO modules (7) output
The enlarging function of frequency signal；The output module (9) is for completing local frequency filter function.
6. Frequency Hopping Synthesizer as claimed in claim 2, it is characterised in that：The phase demodulation module (2), amplification module III
(3), DDS module (4), amplification module II (5), frequency division module (6), VCO modules (7), amplification module I (8), output module (9)
Between be sequentially connected by radiofrequency signal；The interface module (1), phase demodulation module (2), amplification module III (3), DDS module
(4), amplification module II (5), frequency division module (6), VCO modules (7), amplification module I (8), output module (9) pass through EMI punchings
Filter is connect with radiofrequency signal output interface (11).
7. Frequency Hopping Synthesizer as claimed in claim 2, it is characterised in that：The interface module (1), phase demodulation module (2),
It is amplification module III (3), DDS module (4), amplification module II (5), frequency division module (6), VCO modules (7), amplification module I (8), defeated
Go out module (9) to be arranged in the printed board of FRA materials, one side not mounting related components of the printed board close to cavity (12).
8. Frequency Hopping Synthesizer as claimed in claim 7, it is characterised in that：One side of the printed board close to cavity (12)
It is grounded coated with a group layer, and the cavity (12) of printed board close to the one side of cavity (12).
9. Frequency Hopping Synthesizer as claimed in claim 2, it is characterised in that：The phase demodulation module (2), amplification module III
(3), DDS module (4), amplification module II (5), frequency division module (6), VCO modules (7), amplification module I (8), output module (9)
Between be sequentially connected using radio-frequency cable, the radio-frequency cable is all made of the semi-rigid radio-frequency cable without insulating outer protective cover.
10. Frequency Hopping Synthesizer as claimed in claim 2, it is characterised in that：Clock is equipped in the phase demodulation module (2)
Source, phase discriminator and loop filter, amplification module II (5) is interior to be equipped with amplifier, and voltage controlled oscillator is equipped in VCO modules (7), defeated
Go out and is equipped with output filter in module (9).
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| CN201810581406.1A CN108512549A (en) | 2018-06-07 | 2018-06-07 | A kind of Frequency Hopping Synthesizer |
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| CN201810581406.1A CN108512549A (en) | 2018-06-07 | 2018-06-07 | A kind of Frequency Hopping Synthesizer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110224697A (en) * | 2019-06-18 | 2019-09-10 | 苏州兆凯电子有限公司 | A kind of phase lock loop locks method, circuit and transceiver communication system |
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| CN102545959A (en) * | 2012-02-09 | 2012-07-04 | 成都中亚通茂科技有限公司 | Multi-frequency-point broadband signal generator and signal processing method |
| CN104467832A (en) * | 2013-09-13 | 2015-03-25 | 贵州航天天马机电科技有限公司 | A wireless communication apparatus frequency synthesizer |
| CN103647553A (en) * | 2013-12-13 | 2014-03-19 | 中国电子科技集团公司第四十一研究所 | Direct current frequency modulation reference source circuit of broadband ultra low phase noise |
| CN204046573U (en) * | 2014-06-18 | 2014-12-24 | 成都九洲迪飞科技有限责任公司 | Parallel DDS encourages PLL frequency synthesizer |
| CN104518795A (en) * | 2014-12-30 | 2015-04-15 | 武汉中元通信股份有限公司 | Atomic clock module for BD/GPS time signal communication network time service equipment |
| CN105610437A (en) * | 2015-12-18 | 2016-05-25 | 中国电子科技集团公司第四十一研究所 | Loop filtering apparatus for fast broadband frequency hopping synthesizer module |
| CN207251601U (en) * | 2017-09-18 | 2018-04-17 | 贵州航天天马机电科技有限公司 | A kind of radio-frequency channel cell arrangement |
| CN107947788A (en) * | 2017-12-19 | 2018-04-20 | 湖南迈克森伟电子科技有限公司 | Frequency hopping synthesizer, frequency hopping operated control method and its wireless telecom equipment |
| CN208226993U (en) * | 2018-06-07 | 2018-12-11 | 贵州航天天马机电科技有限公司 | A kind of fast frequency-hopped response synthesizer of super Low phase noise |
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| CN110224697A (en) * | 2019-06-18 | 2019-09-10 | 苏州兆凯电子有限公司 | A kind of phase lock loop locks method, circuit and transceiver communication system |
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Application publication date: 20180907 |