CN106209089A - A kind of single loop frequency division type broadband frequency synthesizer of phase locking - Google Patents
- ️Wed Dec 07 2016
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Publication number
- CN106209089A CN106209089A CN201610624496.9A CN201610624496A CN106209089A CN 106209089 A CN106209089 A CN 106209089A CN 201610624496 A CN201610624496 A CN 201610624496A CN 106209089 A CN106209089 A CN 106209089A Authority
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- China Prior art keywords
- frequency
- phase
- broadband
- signal
- loop Prior art date
- 2016-08-02 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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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
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
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- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
A kind of single loop frequency division type ultra broadband frequency synthesizer of phase locking, including crystal oscillator, phase-locked chip, loop filter, voltage controlled oscillator, broadband two power splitter, belt variable frequency divider, wideband switch wave filter.The outfan of crystal oscillator is connected with the input of phase-locked chip；The outfan of phase-locked chip is connected with the input of loop filter；The outfan of loop filter is connected with the input of voltage controlled oscillator；The outfan of voltage controlled oscillator is connected with broadband two power splitter；Broadband two power splitter output two paths of signals, a road is connected with phase-locked chip, and another road is connected with variable bandwidth frequency divider；Variable bandwidth frequency divider is connected with wideband switch wave filter；Wideband switch filter output is the outfan of frequency synthesizer.The invention have the advantages that employing broadband list phase-locked loop, and by variable bandwidth frequency splitting technology, the frequency of output signal is extended, simplify the circuit of realization, reduce equipment amount, reduce cost.
Description
Technical field
The present invention relates to ultra broadband phase-locked Frequency Synthesis Technique Controlled, particularly relate to a kind of novel single loop frequency division type ultra broadband Phase locking frequency synthesis method.
Background technology
Frequency synthesizer is a kind of signal source producing multi-frequency from one or more reference frequencies, at radar, instrument Device test, computer utility, television broadcasting, electronic reconnaissance obtain in uniting with antagonism, navigation, spaceflight and communication isoelectronic series Being widely applied, be commonly called " heart " of electronic system, its performance directly affects whole electronics to a great extent The performance of system.Along with developing rapidly of electronic technology, the especially development of microelectronics integrated technology, electronic system is to frequency synthesis The requirement of device is also gradually stepping up, super large broadband, fast frequency agile, low phase noise, high-resolution, small size and low-power consumption Deng the study hotspot being all frequency synthesizer.
Ultra-wideband (UWB) frequency synthesizer is at wideband radar, electronic reconnaissance and antagonism, instrument and meter and microwave measurement isoelectronic series System plays very important role.The most conventional ultra-wideband (UWB) frequency synthesizer generally uses following two mode to realize: One be by phase-locked generation low frequency signal after, then carry out the mode of multichannel frequency multiplication to realize the broadening of frequency, switched by switch Different frequency multiplication links is selected to realize the generation of ultra-broadband signal；Two is the letter being produced different frequency by multichannel phase lock circuitry Number, then the mode switched by switch is to realize the splicing broadening of frequency spectrum, thus realize the generation of ultra-broadband signal.
The ultra wide band frequency synthesis mode that above two is conventional, owing to have employed multichannel frequency multiplication link, multichannel phase-locked loop Carrying out the frequency of broadening output signal, select a switch to carry out selection and the broadening of frequency by four, circuit realiration is relatively complicated, set Standby amount is bigger, relatively costly, is not easy to the Integrated design of miniaturization.
Summary of the invention
The technical problem to be solved there are provided and a kind of realizes the monocycle that circuit is simple and equipment amount is less Frequency division type broadband, road Phase locking frequency synthesis method.
The present invention is to solve above-mentioned technical problem by the following technical programs: a kind of single loop frequency division type ultra broadband is phase-locked Frequency synthesizer, including crystal oscillator (1), phase-locked chip (2), loop filter (3), voltage controlled oscillator (4), broadband two merit Divide device (5), also include variable bandwidth frequency divider (6), wideband switch wave filter (7)；Wherein, the outfan of crystal oscillator (1) It is connected with the input of phase-locked chip (2)；The outfan of phase-locked chip (2) is connected with the input of loop filter (3)；Loop The outfan of wave filter (3) is connected with the input of voltage controlled oscillator (4)；The outfan of voltage controlled oscillator (4) and broadband two merit Device (5) is divided to be connected；Broadband two power splitter (5) output two paths of signals, a road is connected with phase-locked chip (2), and another road and broadband can Become frequency divider (6) to be connected；Variable bandwidth frequency divider (6) is connected with wideband switch wave filter (7)；Wideband switch wave filter (7) is defeated Go out the end outfan for this novel single loop frequency division type ultra broadband frequency synthesizer of phase locking.
Concrete, the synthetic method of described single loop frequency division type ultra broadband frequency synthesizer of phase locking includes:
The base reference signal that crystal oscillator (1) exports is sent to phase-locked chip (2) as base reference signal, phase-locked core The signal that broadband two power splitter (5) is brought is carried out corresponding scaling down processing by sheet (2), the signal of generation and crystal oscillator (1) base reference signal sent into carries out phase demodulation, and the phase contrast between the two signal is converted into magnitude of voltage by phase-locked chip (2), Being sent to loop filter (3), loop filter (3) is by high fdrequency component therein and noise filtering, and this DC component is given Voltage controlled oscillator (4), voltage controlled oscillator (4) produces the signal of corresponding frequencies according to the magnitude of voltage sent into, and frequency range covers F1 ～F2, this signal is divided into the two paths of signals that amplitude is equal, a road to send phase-locked chip (2) to reflect through broadband two power splitter (5) Phase, another road is sent variable bandwidth frequency divider (6), is changed frequency dividing ratio according to control signal, exports different frequency signals and send broadband to open Closing wave filter (7), frequency dividing ratio is N1Time, the frequency of output signal is F1/N1～F2/N1, frequency dividing ratio is N2Time, the frequency of output signal Rate is F1/N2～F2/N2, by that analogy, frequency dividing ratio is NnTime, the frequency of output signal is F1/Nn～F2/Nn, according to controlling letter Number, the wideband switch wave filter (7) signal to receiving carries out low-pass filtering, filters the clutter letter of other frequencies unwanted Number, output signal is the output signal of single loop frequency division type ultra broadband frequency synthesizer of phase locking, and frequency coverage is F1/Nn ～F2/N1。
Optimizing further, the signal cover of the frequency that described voltage controlled oscillator (4) produces is 10GHz～20GHz, Variable bandwidth frequency dividing ratio is 1,2,4,8, and output frequency coverage is 1.25GHz～20GHz.
Optimizing further, it is brilliant that described crystal oscillator (1) uses the low phase noise constant temperature that frequency is 100MHz Shake.
Optimizing further, described phase-locked chip (2) is charge pump type digital phase-locked loop device, and radio frequency incoming frequency is the highest Reaching 20GHz, the maximum phase demodulation frequency of internal phase-locked chip is 100MHz, and normalization phase noise is-230dBc/Hz, by control Signal processed carries out corresponding parameter configuration.
Optimizing further, described loop filter (3) uses active loop wave filter, and loop bandwidth is 200kHz。
Optimizing further, described voltage controlled oscillator (4) uses frequency range and is covered as the width of 10GHz～20GHz Band voltage controlled oscillator.
Optimizing further, described broadband two power splitter (5) uses passive two merits of frequency coverage 5GHz～30GHz Dividing device, the broadband signal that voltage controlled oscillator (4) exports is divided into two-way, a road is given phase-locked chip (2) and is carried out radio-frequency (RF) FEEDBACK, separately One tunnel is given variable bandwidth frequency divider (6) and is carried out variable division.
Optimizing further, the operating frequency of described variable bandwidth frequency divider (6) covers DC～20GHz, and frequency dividing ratio is passed through It is configured to 1,2,4 and 8 four kind.
Optimizing further, the operating frequency of described wideband switch wave filter (7) is 1.25GHz～20GHz.
The present invention has the advantage that employing broadband list phase-locked loop compared to existing technology, and is divided by variable bandwidth Technology, is extended the frequency of output signal, simplifies the circuit of realization, reduces equipment amount, reduces cost, and is more easy to Integrated design in miniaturization.
Accompanying drawing explanation
Fig. 1 is the structure chart of a kind of novel single loop frequency division type ultra broadband phase locked synthesizer of the present invention.
Detailed description of the invention
Elaborating embodiments of the invention below, the present embodiment is carried out under premised on technical solution of the present invention Implement, give detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following enforcement Example.
Seeing Fig. 1, a kind of novel single loop frequency division type ultra broadband frequency synthesizer of phase locking of the present invention, including crystal oscillation Device 1, phase-locked chip 2, loop filter 3, voltage controlled oscillator 4, broadband two power splitter 5, variable bandwidth frequency divider 6, wideband switch Wave filter 7.Wherein:
The outfan of crystal oscillator 1 is connected with the input of phase-locked chip 2, and the outfan of phase-locked chip 2 is filtered with loop The input of ripple device 3 is connected, and the outfan of loop filter 3 is connected with the input of voltage controlled oscillator 4, voltage controlled oscillator 4 Outfan is connected with broadband two power splitter 5, and broadband two power splitter 5 exports two paths of signals, and a road is connected with phase-locked chip 2, another Road is connected with variable bandwidth frequency divider 6, and variable bandwidth frequency divider 6 is connected with wideband switch wave filter 7, wideband switch wave filter 7 Outfan is the outfan of this novel single loop frequency division type ultra broadband frequency synthesizer of phase locking.
Furtherly, the model of crystal oscillator 1 is SOXO17AF100MDSGC, output signal frequency F0For 100MHz, Output amplitude P1Being about 13dBm, phase noise is better than-155dBc/Hz@1kHz for producing high-quality 100MHz with reference to letter Number.
Phase-locked chip 2 is High Performance Charge Pumps formula digital phase-locked loop device, and model is GM4705A, the highest phase demodulation frequency Reaching 20GHz for 100MHz, firing frequency incoming frequency, normalization phase noise is better than-230dBc/Hz, can pass through control signal Carry out corresponding parameter configuration.
Loop filter 3 uses active loop wave filter, and loop bandwidth is about 200kHz, is filtering phase demodulation error While high fdrequency component in voltage and noise, the voltage of input is exaggerated.
Voltage controlled oscillator 4 uses wideband voltage controlled oscillator, and model is HMC733LC4B, and frequency range covers 10GHz ～20GHz, phase noise is better than-90dBc/Hz@100kHz, carries out the defeated of corresponding frequencies according to the voltage of loop filter input Go out.
Broadband two power splitter 5 uses passive two power splitters of ultra broadband, and model is PD-0530SMG, frequency coverage 5GHz ～30GHz, insertion loss is less than 3dB, and isolation is about 25dBc, and the broadband signal that voltage controlled oscillator exports is divided into two-way, and one Road is given phase-locked chip 2 and is carried out radio-frequency (RF) FEEDBACK, and another road is given variable bandwidth frequency divider 6 and carried out variable division.
The model of variable bandwidth frequency divider 6 is UXD20P, and operating frequency covers DC～20GHz, and frequency dividing ratio can be by configuring Being 1,2,4 and 8 four kind, phase noise is better than-153dBc/Hz@10kHz.
The operating frequency of wideband switch wave filter 7 is 1.25GHz～20GHz, mainly enters the broadband signal after frequency dividing Row region filtering, suppresses first-harmonic and each harmonic signal of the output of variable bandwidth frequency divider, and output spectrum is pure Ultra-broadband signal.
Furtherly, crystal oscillation 1 exports the high-quality crystal oscillation signal of 100MHz high stable, send phase-locked chip 2 as lock The reference clock signal of phase loop, it is 100MHz that phase-locked chip 2 configures phase demodulation frequency, the frequency dividing ratio of Fractional-N frequency device be configured to 100～ 200,10GHz～the 20GHz signal that voltage controlled oscillator 4 is brought, divided to 100MHz by the Fractional-N frequency device of variable dividing radio (frequency dividing ratio corresponding for 10GHz is 100, and frequency dividing ratio corresponding for 20GHz is 200, by that analogy), enters with the crystal oscillation signal of 100MHz Row phase demodulation, is converted into phase contrast between the two voltage output and send loop filter 3, by loop filter 3 by its high frequency Component and noise filtering, and its DC component is sent voltage controlled oscillator 4, voltage controlled oscillator 4 is according to the unidirectional current of loop filter 3 Pressure value exports corresponding frequency signal, and frequency range covers 10GHz～20GHz, and this signal is divided into after broadband two power splitter 5 The two paths of signals that amplitude is equal, a road send phase-locked chip 2 to carry out Fractional-N frequency and phase demodulation processes, and variable bandwidth frequency divider is sent on another road 6, the input signal frequency range of variable bandwidth frequency divider 6 is 10GHz～20GHz, obtains required surpassing by changing frequency dividing ratio Broadband signal, furtherly, when variable bandwidth frequency divider 6 setting of divider is 1, variable bandwidth frequency divider 6 output signal frequency For 10GHz～20GHz；When setting of divider is 2, output signal frequency is 5GHz～10GHz；When setting of divider is 4, Output signal frequency is 2.5GHz～5GHz；When setting of divider is 8, output signal frequency is 1.25GHz～2.5GHz.Wide The broadband signal of belt variable frequency divider 6 output send wideband switch wave filter 7 to be filtered processing, and is divided the clutter produced after frequency dividing Amount filters, and furtherly, owing to the frequency dividing ratio of variable bandwidth frequency divider 6 is 4 kinds of configurations, the signal of frequency divider output is 1.25GHz～2.5GHz, 2.5GHz～5GHz, 5GHz～10GHz and 10GHz and 20GHz totally 4 sections, frequency coverage 1.25GHz ～20GHz.Owing to 4 sections have all been across octave, 2 subharmonic of low end frequency are in the band of output frequency or high-end in frequency Near, it is impossible to it is filtered processing, so each section is required for points 2 sections and carries out low-pass filtering.Filtering the same of fundametal compoment Time, produce the harmonic component of signal after having also filtered out frequency dividing.
1.25GHz～20GHz ultra-broadband signal produces, and owing to using single phase-locked loop, and divides skill by variable bandwidth Art extends the frequency range of output signal, and compare many times frequency multiplication and the phase-locked implementation of multichannel, and the present invention proposes one Novel monocycle frequency dividing ultra broadband Phase locking frequency synthesis method, greatly simplify implementation, reduces circuit arrangement amount, reduction Cost, and it is easier to the Integrated design of miniaturization, the technical advantage of the present invention is obvious.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention Any amendment, equivalent and the improvement etc. made within god and principle, should be included within the scope of the present invention.
Claims (10)
1. a single loop frequency division type ultra broadband frequency synthesizer of phase locking, including crystal oscillator (1), phase-locked chip (2), loop Wave filter (3), voltage controlled oscillator (4), broadband two power splitter (5), it is characterised in that also include variable bandwidth frequency divider (6), width Belt switch wave filter (7)；Wherein, the outfan of crystal oscillator (1) is connected with the input of phase-locked chip (2)；Phase-locked chip (2) outfan is connected with the input of loop filter (3)；The outfan of loop filter (3) and voltage controlled oscillator (4) Input is connected；The outfan of voltage controlled oscillator (4) is connected with broadband two power splitter (5)；Broadband two power splitter (5) output two-way Signal, a road is connected with phase-locked chip (2), and another road is connected with variable bandwidth frequency divider (6)；Variable bandwidth frequency divider (6) with Wideband switch wave filter (7) is connected；Wideband switch wave filter (7) outfan is this novel single loop phase-locked frequency of frequency division type ultra broadband The outfan of rate synthesizer.
A kind of single loop frequency division type ultra broadband frequency synthesizer of phase locking the most according to claim 1, it is characterised in that described The synthetic method of single loop frequency division type ultra broadband frequency synthesizer of phase locking includes:
The base reference signal that crystal oscillator (1) exports is sent to phase-locked chip (2) as base reference signal, phase-locked chip (2) signal that broadband two power splitter (5) is brought is carried out corresponding scaling down processing, the signal of generation and crystal oscillator (1) The base reference signal sent into carries out phase demodulation, and the phase contrast between the two signal is converted into magnitude of voltage, is sent to by phase-locked chip (2) Loop filter (3), loop filter (3) is by high fdrequency component therein and noise filtering, and gives voltage-controlled by this DC component Agitator (4), voltage controlled oscillator (4) produces the signal of corresponding frequencies according to the magnitude of voltage sent into, and frequency range covers F1～F2, This signal is divided into the two paths of signals that amplitude is equal, a road to send phase-locked chip (2) to carry out phase demodulation, separately through broadband two power splitter (5) Variable bandwidth frequency divider (6) is sent on one tunnel, changes frequency dividing ratio according to control signal, and output different frequency signals send wideband switch to filter Device (7), frequency dividing ratio is N1Time, the frequency of output signal is F1/N1～F2/N1, frequency dividing ratio is N2Time, the frequency of output signal is F1/N2～F2/N2, by that analogy, frequency dividing ratio is NnTime, the frequency of output signal is F1/Nn～F2/Nn, according to control signal, wide The belt switch wave filter (7) signal to receiving carries out low-pass filtering, filters the noise signal of other frequencies unwanted, output Signal is the output signal of single loop frequency division type ultra broadband frequency synthesizer of phase locking, and frequency coverage is F1/Nn～F2/N1。
A kind of single loop frequency division type ultra broadband frequency synthesizer of phase locking the most according to claim 2, it is characterised in that described The signal cover of the frequency that voltage controlled oscillator (4) produces is 10GHz～20GHz, and variable bandwidth frequency dividing ratio is 1,2,4,8, Output frequency coverage is 1.25GHz～20GHz.
A kind of single loop frequency division type ultra broadband frequency synthesizer of phase locking the most according to claim 1, it is characterised in that described Crystal oscillator (1) uses the low phase noise constant-temperature crystal oscillator that frequency is 100MHz.
A kind of single loop frequency division type ultra broadband frequency synthesizer of phase locking the most according to claim 1, it is characterised in that described Phase-locked chip (2) is charge pump type digital phase-locked loop device, and radio frequency incoming frequency is up to 20GHz, and internal phase-locked chip is Big phase demodulation frequency is 100MHz, and normalization phase noise is-230dBc/Hz, carries out corresponding parameter configuration by control signal.
A kind of single loop frequency division type ultra broadband frequency synthesizer of phase locking the most according to claim 1, it is characterised in that described Loop filter (3) uses active loop wave filter, and loop bandwidth is 200kHz.
A kind of single loop frequency division type ultra broadband frequency synthesizer of phase locking the most according to claim 1, it is characterised in that described Voltage controlled oscillator (4) uses frequency range and is covered as the wideband voltage controlled oscillator of 10GHz～20GHz.
A kind of single loop frequency division type ultra broadband frequency synthesizer of phase locking the most according to claim 1, it is characterised in that described Broadband two power splitter (5) uses passive two power splitters of frequency coverage 5GHz～30GHz, is exported by voltage controlled oscillator (4) Broadband signal be divided into two-way, a road is given phase-locked chip (2) and is carried out radio-frequency (RF) FEEDBACK, and variable bandwidth frequency divider is given on another road (6) variable division is carried out.
A kind of single loop frequency division type ultra broadband frequency synthesizer of phase locking the most according to claim 1, it is characterised in that described The operating frequency of variable bandwidth frequency divider (6) covers DC～20GHz, and frequency dividing ratio is by being configured to 1,2,4 and 8 four kind.
A kind of single loop frequency division type ultra broadband frequency synthesizer of phase locking the most according to claim 1, it is characterised in that institute The operating frequency stating wideband switch wave filter (7) is 1.25GHz～20GHz.
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| 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 |
| CN109039309A (en) * | 2018-08-06 | 2018-12-18 | 电子科技大学 | High flat degree broadband comb spectrum generator and method for generation based on phaselocked loop mechanism |
| CN109245763A (en) * | 2018-08-21 | 2019-01-18 | 成都天奥电子股份有限公司 | A kind of nearly carrier frequency Frequency Synthesizer with Low Phase Noise |
| 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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