CN102522956A - Expansion method for continuous operation bandwidth of frequency synthesizer and mixing system - Google Patents

Expansion method for continuous operation bandwidth of frequency synthesizer and mixing system Download PDF

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CN102522956A
CN102522956A CN2012100130379A CN201210013037A CN102522956A CN 102522956 A CN102522956 A CN 102522956A CN 2012100130379 A CN2012100130379 A CN 2012100130379A CN 201210013037 A CN201210013037 A CN 201210013037A CN 102522956 A CN102522956 A CN 102522956A
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frequency
mixing
adjustable
delta
mixer
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CN102522956B (en
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张祖舜
沈春乐
胡景一
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NANJING XINXUAN ELECTRONIC SYSTEM ENGINEERING Co Ltd
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NANJING XINXUAN ELECTRONIC SYSTEM ENGINEERING Co Ltd
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Abstract

The invention discloses an expansion method for the continuous operation bandwidth of a frequency synthesizer and a mixing system. The method comprises the following steps of: performing mixing twice by using the frequency synthesizer, wherein a first frequency source F1 and a second frequency source F2 perform primary mixing, and output frequency obtained by the primary mixing and a third frequency source F3 perform secondary mixing; selecting an upper sideband and a lower sideband generated by frequency conversion for the primary mixing, and selecting the upper sideband generated by the frequency conversion for the secondary mixing; in order to obtain a continuously adjustable frequency range, filling a gap between the upper sideband and the lower sideband after the primary mixing and the secondary mixing, and then determining value relations among the frequency sources F1, F2 and F3 and among the adjustable frequency ranges of the F1, the F2 and the F3; and valuing the F1, the F2, the F3 and the adjustable frequency ranges thereof according to the value relations to expand the adjustable frequency range of the output frequency Fout of the frequency synthesizer. Moreover, by the mixing system based on the expansion method for the continuous operation bandwidth, the addition of equipment is not required, and cost is low.

Description

The extended method and the mixing system of frequency synthesizer continuous operation bandwidth
Technical field
The present invention relates to microwave signal frequency generator technical field, particularly a kind of extended method and mixing system of frequency synthesizer continuous operation bandwidth.
Background technology
Frequency stabilization, steady phase (coherent) frequency source are the key components of electronic equipment.Along with the development of technology such as telecommunication, radar, antiaircraft weapon, Atmospheric Survey, frequency source is had higher requirement, as making that work (adjustable) frequency range is wideer, (victory becomes), frequency step are thinner sooner, spectral purity is more high for shift frequency.And the method that adopts mixing between a plurality of coherents source is the common method that reaches above-mentioned requirements.
General; Each coherent source can be by three kinds of frequency synthesis techniques: directly frequency synthesis, the frequency synthesis of lock phase frequency, Direct Digital frequency synthesis, and especially preceding two kinds, for through a plurality of crystal oscillators; A plurality of single-frequency phase-locked loop chips, phase locked source produce through frequency division, frequency multiplication.And usually when adopting the mixing of a plurality of coherents source, often only utilizing in lower sideband that mixing produces, the upper sideband, this just makes whole frequency source continuous promptly becomes adjustable bandwidth of operation and narrows down.Guarantee the bandwidth of operation of broad if desired, then need increase equipment, not only improved the cost of system, also make system architecture very loaded down with trivial details.
Summary of the invention
The objective of the invention is; To the defective of prior art, a kind of extended method of frequency synthesizer continuous operation bandwidth is provided and based on the mixing system of this method, through in two-stage or more multistage mixing; Suitably select the frequency relation between a plurality of coherents source; Make the continuous operation bandwidth expansion of steady phase, the prompt frequency source that becomes, carefully advances more than one times, perhaps on the basis that guarantees former required bandwidth of operation, the tuning range in each coherent source is reduced; Be convenient to filtering, thereby make the frequency of output purer, still less spuious.
For realizing above-mentioned purpose, the technical scheme that the present invention takes is: a kind of extended method of frequency synthesizer continuous operation bandwidth, and frequency synthesizer carries out the two-stage mixing, and the first frequency source in the mixing of definition two-stage is F 1, the second frequency source is F 2, the 3rd frequency source is F 3F wherein 1The adjustable frequency scope be Δ F 1, F 2The adjustable frequency scope be Δ F 2, F 3The adjustable frequency scope be Δ F 3F 1With F 2Frequency of after first order mixing, exporting and F 3Carry out second level mixing, the centre frequency of output is F Out, F OutThe adjustable frequency scope be Δ F ∑Wherein:
Upper sideband and lower sideband that frequency conversion produces are chosen in first order mixing; The upper sideband that frequency conversion produces is chosen in second level mixing; At this moment, the centre frequency of exporting after the two-stage mixing is:
F out＝F 2+F 3 (1)；
At this moment, constitute above-mentioned F OutContinuous adjustable frequency range delta F ∑, then need upper sideband after the two-stage mixing and the crack between the lower sideband be filled up, that is:
F 3 + ΔF 3 2 + [ ( F 2 + ΔF 2 2 ) - ( F 1 - ΔF 1 2 ) ] = F 3 - ΔF 3 2 + [ ( F 2 - ΔF 2 2 ) + ( F 1 - ΔF 1 2 ) ] - - - ( 2 ) ;
Can get by formula (2): Δ F 1+ Δ F 2+ Δ F 3=2F 1(3);
Can get by formula (3): adjustable frequency range delta F ∑=2 (Δ F 1+ Δ F 2+ Δ F 3)=4F 1(4);
According to formula (1), formula (3) and formula (4), choose F 1, F 2, F 3And Δ F 1, Δ F 2, Δ F 3Value, can make the continuous operation bandwidth of frequency synthesizer obtain expansion.
Further, select the F1 frequency values according to the method described above after, that divides between the upper and lower sideband that can make first order mixing produce opens very much; Second level mixing is again to select for use its Intermediate Side Band to carry out mixing output through switch and filtering channel, has so just avoided the interference between the upper and lower sideband.
Based on the mixing system of said method, the first frequency source F that comprises first frequency mixer, second frequency mixer, carries out mixing through first frequency mixer 1With second frequency source F 2, and the 3rd frequency source F that carries out mixing through second frequency mixer with the output frequency of first order frequency mixer 3
Be provided with upper sideband filtering channel and lower sideband filtering channel between the input of the output of first frequency mixer and second frequency mixer; The input of the output of first frequency mixer and second frequency mixer connects upper sideband filtering channel and lower sideband filtering channel through single-pole double-throw switch (SPDT) respectively;
Be provided with the frequency selector channel between the output of second frequency mixer and the mixing system output, all be provided with filter in frequency selector channel, upper sideband filtering channel and the lower sideband filtering channel.
Further, F 1, F 2, F 3Be input in first frequency mixer or second frequency mixer through isolator respectively, isolator is a prior art, can guarantee that frequency source is not disturbed.
Further, the filter in frequency selector channel, upper sideband filtering channel and the lower sideband filtering channel is all the squareness factor design; First frequency mixer and second frequency mixer all adopt two balancing circuitry designs; Make the signal in other coherent source just can not produce interference to second mixing.The frequency mixer of the filter of squareness factor design and the design of two balancing circuitry is all prior art.
Beneficial effect of the present invention does; In a plurality of coherents source during mixing; On the working method basis that lower sideband all utilizes on first order mixing is produced, in conjunction with the crack between two sidebands after the mixing of the second level is filled up, to constitute the technology of continuously adjustable frequency range; Thereby confirm the frequency relation between each coherent source, and the adjustable frequency scope in each coherent source.When using; Only need to select each coherent source according to method of the present invention; Make each coherent source meet frequency relation of the present invention and adjustable frequency scope, just can be on output is realized in the lower sideband butt joint, broadening the continuous prompt adjustable extent that becomes of whole output frequency.And under the situation that need to guarantee former required bandwidth of operation, utilize method of the present invention and mixing system, and the tuning range in each coherent source is reduced, be convenient to filtering, thereby make the frequency of output purer, still less spuious.
Description of drawings
Shown in Figure 1 is the spectrogram that the two-stage mixing produces in the prior art;
Shown in Figure 2 is the spectrogram after the two-stage mixing among the present invention;
Shown in Figure 3 is mixing system schematic block diagram based on the inventive method;
Shown in Figure 4 is to utilize the spectrogram of a kind of specific embodiment of the inventive method and mixing system through two-stage mixing generation.
Embodiment
For making content of the present invention more obviously understandable, do to further describe below in conjunction with accompanying drawing and embodiment.
Utilize the frequency synthesizer of the inventive method to carry out the two-stage mixing, in conjunction with spectrogram shown in Figure 2, the first frequency source in the mixing of definition two-stage is F 1, the second frequency source is F 2, the 3rd frequency source is F 3F wherein 1The adjustable frequency scope be Δ F 1, F 2The adjustable frequency scope be Δ F 2, F 3The adjustable frequency scope be Δ F 3F 1With F 2Frequency of after first order mixing, exporting and F 3Carry out second level mixing, the centre frequency of output is F Out, F OutThe adjustable frequency scope be Δ F ∑Wherein:
Upper sideband and lower sideband that frequency conversion produces are chosen in first order mixing; The upper sideband that frequency conversion produces is chosen in second level mixing; At this moment, the centre frequency of exporting after the two-stage mixing is:
F out＝F 2+F 3 (1)；
At this moment, constitute above-mentioned F OutContinuous adjustable frequency range delta F ∑, then need upper sideband after the two-stage mixing and the crack between the lower sideband be filled up, that is:
F 3 + ΔF 3 2 + [ ( F 2 + ΔF 2 2 ) - ( F 1 - ΔF 1 2 ) ] = F 3 - ΔF 3 2 + [ ( F 2 - ΔF 2 2 ) + ( F 1 - ΔF 1 2 ) ] - - - ( 2 ) ;
Can get by formula (2): Δ F 1+ Δ F 2+ Δ F 3=2F 1(3);
Can get by formula (3): adjustable frequency range delta F ∑=2 (Δ F 1+ Δ F 2+ Δ F 3)=4F 1(4);
According to formula (1), formula (3) and formula (4), choose F 1, F 2, F 3And Δ F 1, Δ F 2, Δ F 3Value, can make the continuous operation bandwidth of frequency synthesizer be expanded.
Mixing system based on said method is as shown in Figure 3, the first frequency source F that comprises first frequency mixer, second frequency mixer, carries out mixing through first frequency mixer 1With second frequency source F 2, and the 3rd frequency source F that carries out mixing through second frequency mixer with the output frequency of first order frequency mixer 3F 1, F 2, F 3Be input in first frequency mixer or second frequency mixer through isolator respectively;
Be provided with upper sideband filtering channel and lower sideband filtering channel between the input of the output of first frequency mixer and second frequency mixer; The input of the output of first frequency mixer and second frequency mixer connects upper sideband filtering channel and lower sideband filtering channel through single-pole double-throw switch (SPDT) respectively;
Be provided with the frequency selector channel between the output of second frequency mixer and the mixing system output, all be provided with the filter of squareness factor design in frequency selector channel, upper sideband filtering channel and the lower sideband filtering channel; First frequency mixer and second frequency mixer all adopt two balancing circuitry designs simultaneously, have improved system's anti-jamming capacity.
When using; Only need to select each coherent source according to method of the present invention; Make each coherent source meet frequency relation of the present invention and adjustable frequency scope, when just can be implemented in output and realize to go up the lower sideband butt joint, the continuous prompt adjustable extent that becomes of the whole output frequency of broadening.And under the situation that need to guarantee former required bandwidth of operation, utilize method of the present invention and mixing system, and the tuning range in each coherent source is reduced, be convenient to filtering, thereby make the frequency of output purer, still less spuious.
The present invention and prior art are contrasted; At first utilize prior art that three frequency sources of locking phase are each other carried out the secondary mixing, each frequency source work centre frequency is respectively: F1 is 100MHZ, and F2 is that 200MHz, F3 are 500MHz; Each oscillation source Frequency Adjustable scope is 10%; Be Δ F1=10MHz, Δ F2=20MHz, Δ F3=50MHz.
In conjunction with Fig. 1, F 1With F 2After carrying out first order mixing, with F 3Carry out second level mixing; Because second level mixing is after the adjustable frequency scope of upper sideband output splits into two sections: i.e. 560～640MHz and 760～840MHz, can not continuous adjustable output.So after first order mixing, the upper sideband that filtering selects for use mixing to produce is 285～315MHz to prior art usually, perhaps lower sideband 85～115MHz participates in second level mixing; Just a section among 760～840MHz or the 560～640MHz is only selected in mixing output place for use in the second level, and every section continuous adjustable frequency is merely 80MHz.
Utilize method and system of the present invention to carry out mixing then; In conjunction with Fig. 4: three oscillation source adjustable frequency scopes still keep identical, select F1 for use according to formula (4), i.e. F1=1/2 (Δ F1+ Δ F2+ Δ F3)=1/2 (10+20+50)=40MHz; At this moment, F2 remains unchanged: i.e. F2=200MHz; Because of F1 is reduced to 40MHz by 100MHz, constant for making output still contain original frequency range (like 760-840Hz), then F3 is risen to 560MHz by 500MHz.After first order mixing; Choose the upper sideband or the lower sideband of generation through the linear filter passage; When the upper sideband output of second level mixing, realize that lower sideband joins then: can find out by Fig. 4; Output frequency expands to 680～840MHz, and its continuous adjustable extent expands to Δ F2=840-680=160MHz, has only utilized adjustable frequency expanded range that a kind of sideband produces in the prior art more shown in Figure 1 in the upper and lower frequency band one times.
Combine Fig. 4 once more; The frequency synthesizer that utilizes method of the present invention and mixing system is when the continuous adjustment of doing output frequency, and like adjustment from low to high, promptly 680 when being transferred to 840MHz; Common three source F1, F2, F3 are corresponding; Also be that adjustment from low to high: F1 is transferred to 45MHz by 35, F2 is transferred to 210MHz by 190, and F3 is transferred to 585MHz by 535.But when being output as 680～760MHz and adjusting continuously, because what utilize is the lower sideband of first mixing, i.e. 140～175MHz, so this moment, the adjustment of F1 frequency source should be reversed accordingly, i.e. and from high to low continuous adjustment is promptly by 45MHz～35MHz.The adjustment programming utilizes prior art to be very easy to realize.
The case of practical implementation described in the present invention is merely preferable case study on implementation of the present invention, is not to be used for limiting practical range of the present invention.Be that all equivalences of doing according to the content of claim of the present invention change and modification, all should be as technological category of the present invention.

Claims (4)

1. the extended method of a frequency synthesizer continuous operation bandwidth, it is characterized in that: frequency synthesizer carries out the two-stage mixing, and the first frequency source in the mixing of definition two-stage is F1, and the second frequency source is F 2, the 3rd frequency source is F 3F wherein 1The adjustable frequency scope be Δ F 1, F 2The adjustable frequency scope be Δ F 2, F 3The adjustable frequency scope be Δ F 3F 1With F 2Frequency of after first order mixing, exporting and F 3Carry out second level mixing, the centre frequency of output is F Out, F OutThe adjustable frequency scope be Δ F ∑
Upper sideband and lower sideband that frequency conversion produces are chosen in first order mixing; The upper sideband that frequency conversion produces is chosen in second level mixing; At this moment, the centre frequency of exporting after the two-stage mixing is: F Out=F 2+ F 3(1);
Will constitute F this moment OutContinuous adjustable frequency range delta F ∑, then need upper sideband after the two-stage mixing and the crack between the lower sideband be filled up, that is:
F 3 + ΔF 3 2 + [ ( F 2 + ΔF 2 2 ) - ( F 1 - ΔF 1 2 ) ] = F 3 - ΔF 3 2 + [ ( F 2 - ΔF 2 2 ) + ( F 1 - ΔF 1 2 ) ] - - - ( 2 ) ;
Can get by formula (2): Δ F 1+ Δ F 2+ Δ F 3=2F 1(3);
Can get by formula (3): adjustable frequency range delta F ∑=2 (Δ F 1+ Δ F 2+ Δ F 3)=4F 1(4);
According to formula (1), formula (3) and formula (4), choose F 1, F 2, F 3And Δ F 1, Δ F 2, Δ F 3Value, can make the continuous operation bandwidth of frequency synthesizer obtain expansion.
2. based on the mixing system of the said method of claim 1, it is characterized in that the first frequency source F that comprises first frequency mixer, second frequency mixer, carries out mixing through first frequency mixer 1With second frequency source F 2, and the 3rd frequency source F that carries out mixing through second frequency mixer with the output frequency of first frequency mixer 3
Be provided with upper sideband filtering channel and lower sideband filtering channel between the input of the output of first frequency mixer and second frequency mixer; The input of the output of first frequency mixer and second frequency mixer connects upper sideband filtering channel and lower sideband filtering channel through single-pole double-throw switch (SPDT) respectively;
Be provided with the frequency selector channel between the output of second frequency mixer and the mixing system output, all be provided with filter in frequency selector channel, upper sideband filtering channel and the lower sideband filtering channel.
3. mixing system according to claim 2 is characterized in that F 1, F 2, F 3Be input in first frequency mixer or second frequency mixer through isolator respectively.
4. according to claim 2 or 3 described mixing systems, it is characterized in that the filter in frequency selector channel, upper sideband filtering channel and the lower sideband filtering channel is all the squareness factor design; First frequency mixer and second frequency mixer all adopt two balancing circuitry designs.
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Cited By (2)

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Publication number Priority date Publication date Assignee Title
CN103501160A (en) * 2013-09-22 2014-01-08 北京无线电计量测试研究所 Phase compensation method for frequency conversion time delay calibration system
CN105045177A (en) * 2015-07-08 2015-11-11 中国科学院国家授时中心 Multiple-channel selective filtering frequency output device

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Cited By (3)

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Publication number Priority date Publication date Assignee Title
CN103501160A (en) * 2013-09-22 2014-01-08 北京无线电计量测试研究所 Phase compensation method for frequency conversion time delay calibration system
CN103501160B (en) * 2013-09-22 2016-01-06 北京无线电计量测试研究所 For the phase compensating method of frequency conversion time delay calibration system
CN105045177A (en) * 2015-07-08 2015-11-11 中国科学院国家授时中心 Multiple-channel selective filtering frequency output device

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