CN108418583A  The thin stepping frequency agility apparatus for frequency synthesizing in broadband and method based on cascade mixing  Google Patents
The thin stepping frequency agility apparatus for frequency synthesizing in broadband and method based on cascade mixing Download PDFInfo
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 CN108418583A CN108418583A CN201810228690.4A CN201810228690A CN108418583A CN 108418583 A CN108418583 A CN 108418583A CN 201810228690 A CN201810228690 A CN 201810228690A CN 108418583 A CN108418583 A CN 108418583A
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 frequency
 signal
 vibration source
 local vibration
 output
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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 phaselocked loop
 H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency or phaselocked loop
Abstract
The present invention relates to a kind of thin stepping frequency agility apparatus for frequency synthesizing in broadband and method based on cascade mixing, which carries out multistage with the pointfrequency signal of thick stepping using the DDS signals of thin stepping and is mixed, and generates broadband, thin step frequency.Under existing device level, by suitable type selecting, which has the characteristics that broadband, thin stepping, frequency agility, low phase noise, low spurious and miniaturization.
Description
Technical field
The invention belongs to microwave technical fields, are related to a kind of highperformance designs of Microwave Frequency Source, and in particular to for based on
Cascade the thin stepping frequency agility apparatus for frequency synthesizing in broadband and method of mixing.
Background technology
Microwave Frequency Source is critical component in microwave circuit, especially in application scenarios such as radar, interference confrontation, microwave imagings
Under, performance indicator is particularly harsh.Some existing frequency combining methods are more traditional, it is difficult to take into account broadband, thin stepping, agile
Frequently, low phase noise, low spurious and the requirement of miniaturization.The present invention proposes a kind of frequency combining method based on cascade mixing,
Under existing device level, by suitable type selecting, which there is broadband, thin stepping, frequency agility, low phase to make an uproar
The characteristics of sound, low spurious and miniaturization.
Invention content
Technical problems to be solved
It is further harsh to the index request of frequency source under the application scenarios such as radar, interference confrontation, microwave imaging.It is existing
Frequency combining method is difficult to take into account broadband, low phase noise, thin stepping, the requirement of frequency agility, low spurious and miniaturization.The present invention
A kind of novel microwave synthesizer device and method is proposed, this method is based on current device level, can meet simultaneously micro
The high target and miniature requirement in wave frequency rate source.
Technical solution
A kind of thin stepping frequency agility apparatus for frequency synthesizing in broadband based on cascade mixing, including the first local vibration source, DDS, the
Two local vibration sources, M grade frequency mixer, two road power splitter of M1 grades, the roads M1 power splitter and hilted broadsword M throw switches, wherein M are just more than 1
Integer；First local vibration source generates F_{1}、F_{2}、...、F_{N}Point frequency, wherein F_{2}F_{1}=F_{3}F_{2}==F_{N}F_{N1}=
BW_{0}, N is positive integer；It is F that DDS, which generates frequency range,_{a}~F_{b}, bandwidth BW_{0}Thin stepping intermediatefreuqncy signal, frequency stepping is reachable
0.1Hz；It is N × BW that second local vibration source, which generates frequency,_{0}Single pointfrequency signal；First local vibration source connects the ends LO of first order frequency mixer
Mouthful, the second local vibration source connects the ports IF of first order frequency mixer, first order frequency mixer output connection two road power splitter of the first order；The
Two local vibration sources separate the second local oscillation signal of the roads M1 by the roads M1 power splitter work(, equal per the second local oscillation signal that work(separates all the way
Connect the ports IF of a frequency mixer；After two road power splitter of the first order is divided into two, all the way with the second roads local vibration source work(Fen M1
Two road power splitter of the second level is input to after being mixed, another way is directly inputted to hilted broadsword M throw switches, two road power splitter of the second level
Connection relation to two road power splitter of M1 grades is identical as two road power splitter of the first order, and the output of M grades of frequency mixers is connected to list
Knife M throw switches.
The thin stepping frequency agility frequency combining method in broadband that abovementioned synthesizer is realized, when the first local vibration source provides F1
Point frequency when, take frequency mixer export and frequency, output frequency F_{1}+ Fa~F_{1}+F_{b}, bandwidth BW_{0}；When the first local vibration source provides F_{2}'s
When point frequency, frequency mixer output and frequency, output frequency F are taken_{2}+F_{a}~F_{2}+F_{b}, bandwidth BW_{0}；And so on, when the first local vibration source
F is provided_{N}Point frequency when, take frequency mixer export and frequency, output frequency F_{N}+F_{a}~F_{N}+F_{b}, bandwidth BW_{0}；First order mixing is defeated
The frequency range gone out is F_{1}+ Fa~F_{N}+F_{b}, bandwidth is N × BW_{0}；If F_{A}=F_{1}+F_{a}, F_{B}=F_{N}+F_{b}, BW_{N}=N × BW_{0}；The signal
Enter hilted broadsword M throw switches after into two road power splitters, when gating the road, final exportable F_{A}~F_{B}Frequency signal, bandwidth are
BW_{N}；
F_{A}~F_{B}Signal is output to second level frequency mixer from two road power splitters, with the second local oscillator point frequency BW_{N}Signal is mixed
Frequently, mixed frequency signal difference frequency is F_{A}BW_{N}~F_{B}BW_{N}And frequency signal is F_{A}+BM_{N}~F_{B}+BW_{N}, and frequency and difference frequency bandwidth are BW_{N}；
The signal enters hilted broadsword M throw switches after entering two road power splitters, when gating the road, final exportable F_{A}BW_{N}~F_{B}BW_{N}And F_{A}
+BW_{N}~F_{B}+BW_{N}；Output signal frequency range is F after first order mixing_{A}~F_{B}, the second tunnel can export F jointly with the first via_{A}BW_{N}
~F_{B}+BW_{N}；And so on, it is finally F from the exportable frequency range of hilted broadsword M throw switches when cascade mixing link reaches M grades_{A}
(M1)×BW_{N}~F_{B}+(M1) ×BW_{N}；Work as F_{A}(M1)×BW_{N}When frequency is less than or equal to 0, it is necessary to which stopping takes difference frequency, only takes
And frequency.
Advantageous effect
A kind of thin stepping frequency agility apparatus for frequency synthesizing in broadband and method based on cascade mixing proposed by the present invention, the frequency
Rate synthetic method is based on cascade and is mixed, and can realize broadband, thin stepping, frequency agility, low phase noise, low spurious and miniaturization etc.
Advantage.
Description of the drawings
Frequency combining method block diagrams of the Fig. 1 based on cascade mixing
3~8GHz frequency source schemes of the Fig. 2 based on cascade mixing
Specific implementation mode
In conjunction with embodiment, attached drawing, the invention will be further described：
Based on the frequency combining method of cascade mixing, its signal flow graph is as shown in Figure 1.Wherein 1 is the first local vibration source, letter
Number have the characteristics that low phase noise, thick stepping, broadband, it is possible to provide F_{1},F_{2}...F_{N}The point frequency of (N is positive integer), wherein F_{2}F_{1}
=F_{3}F_{2}==F_{N}F_{N1}=BW_{0}；2 be the thin stepping intermediatefreuqncy signal based on DDS, provides the frequency range F of signal_{a}~
F_{b}, bandwidth BW_{0}, frequency stepping is up to 0.1Hz；3 be the second local vibration source, is single pointfrequency signal, and frequency is N × BW_{0}；4 and with 4
Identical graphical symbol is frequency mixer；5 and graphical symbol identical with 5 be two road power splitters；6 be that (M is just whole more than 1 to M1
Number) road power splitter；7 be hilted broadsword M throw switches.The ports LO of first local vibration source, 1 input mixer, the second local vibration source 2 and intermediate frequency letter
The ports IF of number 3 input mixers.Second local vibration source 2 separates the second local oscillation signal of the roads M1 by the roads M1 power splitter.Arrow side
To expression signal transmission direction.
When the first local vibration source provides F_{1}Point frequency when, take frequency mixer export and frequency, output frequency F_{1}+F_{a}~F_{1}+F_{b}, bandwidth
For BW_{0}；When the first local vibration source provides F_{2}Point frequency when, take frequency mixer export and frequency, output frequency F_{2}+F_{a}~F_{2}+F_{b}, bandwidth
For BW_{0}；And so on, when the first local vibration source provides F_{N}Point frequency when, take frequency mixer export and frequency, output frequency F_{N}+F_{a}~F_{N}+
F_{b}, bandwidth BW_{0}.Due to F_{1},F_{2}...F_{N}Between frequency point differ BW_{0}, it is seen that the frequency range of first order mixing output is F_{1}
+F_{a}~F_{N}+F_{b}, bandwidth is N × BW_{0}.For convenience of expression, if F_{A}=F_{1}+F_{a}, F_{B}=F_{N}+F_{b}, BW_{N}=N × BW_{0}.The signal enters
Enter hilted broadsword M throw switches after two road power splitters, when gating the road, final exportable F_{A}~F_{B}Frequency signal, bandwidth BW_{N}。
F_{A}~F_{B}Signal is output to second level frequency mixer (M=2 at this time) from two road power splitters, with the second local oscillator point frequency BW_{N}Letter
It number is mixed, mixed frequency signal difference frequency is F_{A}BW_{N}~F_{B}BW_{N}, and frequency signal is F_{A}+BM_{N}~F_{B}+BW_{N}, it is seen that and frequency and
Difference frequency bandwidth is BW_{N}.The signal enters hilted broadsword M throw switches after entering two road power splitters, final exportable when gating the road
F_{A}BW_{N}~F_{B}BW_{N}And F_{A}+BW_{N}~F_{B}+BW_{N}.Output signal frequency range is F after first order mixing_{A}~F_{B}, the second tunnel is total to the first via
It is same to export F_{A}BW_{N}~F_{B}+BW_{N}。
And so on, it is finally F from the exportable frequency range of hilted broadsword M throw switches when cascade mixing link reaches M grades_{A}
(M1)×BW_{N}~F_{B}+(M1)×BW_{N}。
It is noted that working as F_{A}(M1)×BW_{N}Frequency be less than or equal to 0 when, it is necessary to stopping take difference frequency, only take and frequency because
Frequency cannot be negative.
Specific frequency source scheme is as shown in Fig. 2, set N=5, M=3, BW_{0}=200MHz.1 is the first local vibration source, is
4.7GHz, 4.9GHz...5.5GHz point frequency；2 be the second local vibration source, is 1GHz point frequencies；3 be the thin stepping intermediate frequency letter based on DDS
Number, frequency range is 300MHz~500MHz, stepping 0.1Hz；4 and graphical symbol identical with 4 be frequency mixer；5 and identical with 5
Graphical symbol is two road power splitters；6 be 2 road power splitters；7 be 3 throw switch of hilted broadsword.The ends LO of first local vibration source, 1 input mixer
Mouthful, the ports IF of 3 input mixer of the second local vibration source 2 and intermediatefreuqncy signal.
The first order is mixed：Frequency mixer output and frequency, exportable frequency model are taken after intermediatefreuqncy signal and the mixing of the first local oscillation signal
Enclose 5GHz~6GHz.The second level is mixed：First order output signal is mixed with the second local oscillator, difference frequency signal be 4GHz~
5GHz and frequency signal are 6GHz~7GHz, and exportable 4GHz~7GHz signals are merged with the first order.The third level is mixed：The second level
Output signal is mixed with the second local oscillator, and difference frequency signal is 3GHz~4GHz and frequency signal is 7GHz~8GHz, with preceding twostage
Exportable 3GHz~8GHz signals after signal merges, signal flow diagram refer to Fig. 2.
Claims (2)
1. a kind of thin stepping frequency agility apparatus for frequency synthesizing in broadband based on cascade mixing, it is characterised in that including the first local vibration source
(1), DDS (2), the second local vibration source (3), M grades of frequency mixers (4), two road power splitter (5) of M1 grades, the roads M1 power splitter (6) and hilted broadsword
M throw switches (7), wherein M are the positive integer more than 1；First local vibration source (1) generates F_{1}、F_{2}、...、F_{N}Point frequency, wherein
F_{2}F_{1}=F_{3}F_{2}==F_{N}F_{N1}=BW_{0}, N is positive integer；It is F that DDS (2), which generates frequency range,_{a}~F_{b}, bandwidth BW_{0}
Thin stepping intermediatefreuqncy signal, frequency stepping is up to 0.1Hz；It is N × BW that second local vibration source (3), which generates frequency,_{0}Single pointfrequency signal；
First local vibration source (1) connects the ports LO of first order frequency mixer, and the second local vibration source (3) connects the ports IF of first order frequency mixer,
First order frequency mixer output connection two road power splitter of the first order；Second local vibration source (2) separates the roads M1 by the roads M1 power splitter work(
Second local oscillation signal is all connected with the ports IF of a frequency mixer per the second local oscillation signal that work(separates all the way；Two road work(of the first order
After dividing device to be divided into two, two road work(of the second level point is input to after being mixed all the way with the roads the second local vibration source (2) work(Fen M1
Device, another way are directly inputted to hilted broadsword M throw switches (7), and the connection of two road power splitter of the second level to two road power splitter of M1 grades is closed
System is identical as two road power splitter of the first order, and the output of M grades of frequency mixers is connected to hilted broadsword M throw switches (7).
2. the thin stepping frequency agility frequency combining method in broadband that synthesizer according to claim 1 is realized, feature exist
In：When the first local vibration source (1) provides the point frequency of F1, frequency mixer output and frequency, output frequency F are taken_{1}+ Fa~F_{1}+F_{b}, bandwidth
For BW_{0}；When the first local vibration source provides F_{2}Point frequency when, take frequency mixer export and frequency, output frequency F_{2}+F_{a}~F_{2}+F_{b}, bandwidth is
BW_{0}；And so on, when the first local vibration source provides F_{N}Point frequency when, take frequency mixer export and frequency, output frequency F_{N}+F_{a}~F_{N}+
F_{b}, bandwidth BW_{0}；The frequency range of first order mixing output is F_{1}+ Fa~F_{N}+F_{b}, bandwidth is N × BW_{0}；If F_{A}=F_{1}+F_{a}, F_{B}
=F_{N}+F_{b}, BW_{N}=N × BW_{0}；The signal finally may be used into hilted broadsword M throw switches when gating the road after entering two road power splitters
Export F_{A}~F_{B}Frequency signal, bandwidth BW_{N}；
F_{A}~F_{B}Signal is output to second level frequency mixer from two road power splitters, with the second local oscillator point frequency BW_{N}Signal is mixed, and is mixed
Frequency signal difference frequency is F_{A}BW_{N}~F_{B}BW_{N}And frequency signal is F_{A}+BM_{N}~F_{B}+BW_{N}, and frequency and difference frequency bandwidth are BW_{N}；The signal
Enter hilted broadsword M throw switches after into two road power splitters, when gating the road, final exportable F_{A}BW_{N}~F_{B}BW_{N}And F_{A}+BW_{N}~
F_{B}+BW_{N}；Output signal frequency range is F after first order mixing_{A}~F_{B}, the second tunnel can export F jointly with the first via_{A}BW_{N}~F_{B}+
BW_{N}；And so on, it is finally F from the exportable frequency range of hilted broadsword M throw switches when cascade mixing link reaches M grades_{A}(M1)
×BW_{N}~F_{B}+(M1)×BW_{N}；Work as F_{A}(M1)×BW_{N}Frequency be less than or equal to 0 when, it is necessary to stopping take difference frequency, only take and frequency.
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