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 PDF

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Publication number
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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CN201810228690.4A
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CN108418583B (en
Inventor
王栋
常进
芦嘉
李昂
刘洪升
糜光璞
杨俐
李良
余铁军
段军
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Xian Electronic Engineering Research Institute
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Xian Electronic Engineering Research Institute
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    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03LAUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00Automatic control of frequency or phase; Synchronisation
    • H03L7/06Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/16Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked 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 point-frequency 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

The thin stepping frequency agility apparatus for frequency synthesizing in broadband and method based on cascade mixing
Technical field
The invention belongs to microwave technical fields, are related to a kind of high-performance 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 M-1 grades, the roads M-1 power splitter and hilted broadsword M throw switches, wherein M are just more than 1 Integer;First local vibration source generates F1、F2、...、FNPoint frequency, wherein F2-F1=F3-F2==FN-FN-1= BW0, N is positive integer;It is F that DDS, which generates frequency range,a~Fb, bandwidth BW0Thin stepping intermediate-freuqncy signal, frequency stepping is reachable 0.1Hz;It is N × BW that second local vibration source, which generates frequency,0Single point-frequency 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 M-1 by the roads M-1 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 M-1 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 M-1 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 above-mentioned synthesizer is realized, when the first local vibration source provides F1 Point frequency when, take frequency mixer export and frequency, output frequency F1+ Fa~F1+Fb, bandwidth BW0;When the first local vibration source provides F2's When point frequency, frequency mixer output and frequency, output frequency F are taken2+Fa~F2+Fb, bandwidth BW0;And so on, when the first local vibration source F is providedNPoint frequency when, take frequency mixer export and frequency, output frequency FN+Fa~FN+Fb, bandwidth BW0;First order mixing is defeated The frequency range gone out is F1+ Fa~FN+Fb, bandwidth is N × BW0;If FA=F1+Fa, FB=FN+Fb, BWN=N × BW0;The signal Enter hilted broadsword M throw switches after into two road power splitters, when gating the road, final exportable FA~FBFrequency signal, bandwidth are BWN
FA~FBSignal is output to second level frequency mixer from two road power splitters, with the second local oscillator point frequency BWNSignal is mixed Frequently, mixed frequency signal difference frequency is FA-BWN~FB-BWNAnd frequency signal is FA+BMN~FB+BWN, and frequency and difference frequency bandwidth are BWN; The signal enters hilted broadsword M throw switches after entering two road power splitters, when gating the road, final exportable FA-BWN~FB-BWNAnd FA +BWN~FB+BWN;Output signal frequency range is F after first order mixingA~FB, the second tunnel can export F jointly with the first viaA-BWN ~FB+BWN;And so on, it is finally F from the exportable frequency range of hilted broadsword M throw switches when cascade mixing link reaches M gradesA- (M-1)×BWN~FB+(M-1) ×BWN;Work as FA-(M-1)×BWNWhen 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 F1,F2...FNThe point frequency of (N is positive integer), wherein F2-F1 =F3-F2==FN-FN-1=BW0;2 be the thin stepping intermediate-freuqncy signal based on DDS, provides the frequency range F of signala~ Fb, bandwidth BW0, frequency stepping is up to 0.1Hz;3 be the second local vibration source, is single point-frequency signal, and frequency is N × BW0;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 M-1 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 M-1 by the roads M-1 power splitter.Arrow side To expression signal transmission direction.
When the first local vibration source provides F1Point frequency when, take frequency mixer export and frequency, output frequency F1+Fa~F1+Fb, bandwidth For BW0;When the first local vibration source provides F2Point frequency when, take frequency mixer export and frequency, output frequency F2+Fa~F2+Fb, bandwidth For BW0;And so on, when the first local vibration source provides FNPoint frequency when, take frequency mixer export and frequency, output frequency FN+Fa~FN+ Fb, bandwidth BW0.Due to F1,F2...FNBetween frequency point differ BW0, it is seen that the frequency range of first order mixing output is F1 +Fa~FN+Fb, bandwidth is N × BW0.For convenience of expression, if FA=F1+Fa, FB=FN+Fb, BWN=N × BW0.The signal enters Enter hilted broadsword M throw switches after two road power splitters, when gating the road, final exportable FA~FBFrequency signal, bandwidth BWN
FA~FBSignal is output to second level frequency mixer (M=2 at this time) from two road power splitters, with the second local oscillator point frequency BWNLetter It number is mixed, mixed frequency signal difference frequency is FA-BWN~FB-BWN, and frequency signal is FA+BMN~FB+BWN, it is seen that and frequency and Difference frequency bandwidth is BWN.The signal enters hilted broadsword M throw switches after entering two road power splitters, final exportable when gating the road FA-BWN~FB-BWNAnd FA+BWN~FB+BWN.Output signal frequency range is F after first order mixingA~FB, the second tunnel is total to the first via It is same to export FA-BWN~FB+BWN
And so on, it is finally F from the exportable frequency range of hilted broadsword M throw switches when cascade mixing link reaches M gradesA- (M-1)×BWN~FB+(M-1)×BWN
It is noted that working as FA-(M-1)×BWNFrequency 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, BW0=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 intermediate-freuqncy signal.
The first order is mixed:Frequency mixer output and frequency, exportable frequency model are taken after intermediate-freuqncy 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 two-stage 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 M-1 grades, the roads M-1 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 F1、F2、...、FNPoint frequency, wherein F2-F1=F3-F2==FN-FN-1=BW0, N is positive integer;It is F that DDS (2), which generates frequency range,a~Fb, bandwidth BW0 Thin stepping intermediate-freuqncy signal, frequency stepping is up to 0.1Hz;It is N × BW that second local vibration source (3), which generates frequency,0Single point-frequency 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 M-1 by the roads M-1 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 M-1 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 M-1 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 taken1+ Fa~F1+Fb, bandwidth For BW0;When the first local vibration source provides F2Point frequency when, take frequency mixer export and frequency, output frequency F2+Fa~F2+Fb, bandwidth is BW0;And so on, when the first local vibration source provides FNPoint frequency when, take frequency mixer export and frequency, output frequency FN+Fa~FN+ Fb, bandwidth BW0;The frequency range of first order mixing output is F1+ Fa~FN+Fb, bandwidth is N × BW0;If FA=F1+Fa, FB =FN+Fb, BWN=N × BW0;The signal finally may be used into hilted broadsword M throw switches when gating the road after entering two road power splitters Export FA~FBFrequency signal, bandwidth BWN
FA~FBSignal is output to second level frequency mixer from two road power splitters, with the second local oscillator point frequency BWNSignal is mixed, and is mixed Frequency signal difference frequency is FA-BWN~FB-BWNAnd frequency signal is FA+BMN~FB+BWN, and frequency and difference frequency bandwidth are BWN;The signal Enter hilted broadsword M throw switches after into two road power splitters, when gating the road, final exportable FA-BWN~FB-BWNAnd FA+BWN~ FB+BWN;Output signal frequency range is F after first order mixingA~FB, the second tunnel can export F jointly with the first viaA-BWN~FB+ BWN;And so on, it is finally F from the exportable frequency range of hilted broadsword M throw switches when cascade mixing link reaches M gradesA-(M-1) ×BWN~FB+(M-1)×BWN;Work as FA-(M-1)×BWNFrequency be less than or equal to 0 when, it is necessary to stopping take difference frequency, only take and frequency.
CN201810228690.4A 2018-03-20 2018-03-20 Broadband fine stepping frequency agility frequency synthesis device and method based on cascade frequency mixing Active CN108418583B (en)

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