CN203243310U - Microwave signal source - Google Patents
Microwave signal source Download PDFInfo
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- CN203243310U CN203243310U CN 201320230367 CN201320230367U CN203243310U CN 203243310 U CN203243310 U CN 203243310U CN 201320230367 CN201320230367 CN 201320230367 CN 201320230367 U CN201320230367 U CN 201320230367U CN 203243310 U CN203243310 U CN 203243310U
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Abstract
The utility model provides a microwave signal source comprising a high-stability crystal oscillator used for generating multiple frequency reference signals; a signal output component used for respectively generating frequency modulation signals, X-band phase-locked signals and L-band point frequency signals based on the multiple frequency reference signals; a first-stage frequency mixing filtering component used for performing frequency mixing for the frequency modulation signals and the X-band phase-locked signals and outputting X-band frequency modulation signals; and a second-stage frequency mixing filtering component used for performing frequency mixing for the L-band point frequency signals and the X-band frequency modulation signals and outputting frequency modulation signals under X-band point frequency. The microwave signal source can meet both requirements of frequency offset fixing of frequency modulation and low phase noises in the production practice.
Description
Technical field
The utility model relates to the technical field of microwave signal process, particularly relates to a kind of microwave signal source.
Background technology
Signal source is the instrument that produces the electric test signal of desired parameters, has a wide range of applications in production practices and sciemtifec and technical sphere.When using signal source to produce required test signal, usually to consider the impact of phase noise.Phase noise is because the sideband that noise causes is expanded, and it is the Important Parameters of characterization signal short-term frequency stability and the important indicator of estimating spectral purity.Signal source as test macro, also to satisfy the changeable demand of user flexibility, wherein, frequency modulation deviation fixedly is common customer requirements, it refers to the maximum offset of FM signal frequency departure centre frequency (fixed value), when using on the engineering, General Requirements is linear relationship, is referred to as linear frequency modulation.Yet general signal generating method is difficult to take into account the requirement that phase noise is low and frequency deviation is fixing.
For example, as the signal source of test macro, it is the three or more frequencies of X-band that the user needs the carrier frequency frequency, has extremely low phase noise, and frequency modulation deviation is fixed value, very little etc. with the ratio of carrier frequency frequency.
In order to realize above-mentioned requirements, general method has following several:
(a) adopt low frequency signal to carry out frequency modulation(FM), many times frequency multiplication is realized the signal of required frequency and modulating characteristic.The method frequency stability and frequency modulation deviation stability meet the demands, but the signal third order intermodulation is higher, and spectral purity is not too high.
(b) the proportion synthesizer combines with voltage controlled oscillator, produces desired signal.The clutter that the method produces is more, signal harmonic rejection relative mistake, and spectral purity is not high.
(c) adopt the high-performance broadband PCB Signal-Testing Generator, add modulation signal, directly produce desired signal.The method can satisfy customer requirements, but its cost is very high, and the general user is difficult to accept, and use is restricted.
Thereby, need at present the urgent technical problem that solves of those skilled in the art to be exactly: how to produce a kind of microwave frequency modulation signal, can in production practices, take into account the fixing and low requirement of phase noise of frequency modulation deviation under the multiple spot frequency.
The utility model content
The utility model provides a kind of microwave signal, can't realize that with general microwave signal source in the solution production practices multiple spot descends the fixing and low problem of phase noise of frequency modulation deviation frequently.
In order to address the above problem, the utility model discloses a kind of microwave signal source, comprising:
Highly stable crystal oscillator is for generation of the channelized frequencies reference signal;
Signal component output is used for generating respectively FM signal based on described channelized frequencies reference signal, X-band lockin signal and L-band point-frequency signal;
First order mixing and filtering assembly is used for described FM signal and X-band lockin signal are carried out mixing, output X-band FM signal;
Second level mixing and filtering assembly is used for described L-band point-frequency signal and X-band FM signal are carried out mixing, the FM signal under the output X-band point frequency.
Preferably, described channelized frequencies reference signal is that described signal component output comprises more than or equal to 3 tunnel frequency reference signals:
The FM PLL unit for generation of FM signal, and carries out described FM signal and one tunnel frequency reference signal wherein phase-locked, obtains to satisfy the FM signal of designated carrier frequency and frequency modulation deviation;
X-band pulsating medium phase locked source unit for generation of the X-band local oscillation signal, and carries out described X-band local oscillation signal and one tunnel frequency reference signal wherein phase-locked, obtains the X-band lockin signal;
L-band local oscillator unit for generation of n the L-band microwave signal that frequency is different, carries out phase-lockedly with described remaining n road frequency reference signal described n L-band microwave signal respectively, obtains n L-band point-frequency signal; According to one of them L-band point-frequency signal of FREQUENCY CONTROL command selection that host computer transmits, wherein, described n is the integer more than or equal to 1.
Preferably, described FM PLL unit comprises voltage controlled oscillator, phase discriminator, frequency divider and low pass filter.
Preferably, described X-band pulsating medium phase locked source unit comprises X-band dielectric oscillator, phase discriminator, frequency divider and filter.
Preferably, described L-band local oscillator unit comprises: n independent phase-locked oscillator, single-chip microcomputer frequency controller and microwave single knife switch.
Preferably, described first order mixing and filtering assembly comprises:
Frequency mixer is used for FM signal and the X-band pulsating medium phase locked source unit generation X-band lockin signal of the output of described FM PLL unit are carried out mixing, produces the X-band FM signal;
The filter and amplification assembly, after described X-band FM signal being carried out filtering and amplification, the X-band FM signal of the default power of output.
Preferably, described second level mixing and filtering assembly comprises:
The X-band frequency mixer is used for described L-band point-frequency signal and X-band FM signal are carried out mixing, produces the FM signal under the X-band point frequency;
The filter and amplification barrier assembly, after the FM signal under the described X-band point frequency is carried out filtering, amplification and isolation, the FM signal under the X-band point frequency of the default power of output.
Compared with prior art, the utility model comprises following advantage:
The first, the utility model embodiment provides a kind of microwave signal source, has adopted multiple oscillation and mixing mode, can produce a kind of FM signal under lower-cost condition, satisfies simultaneously the function of general user's proposition and the requirement on the performance.
Second, owing to adopted highly stable crystal oscillator, the frequency reference signal stabilization of generation is high, phase noise is extremely low, therefore, based on the signal that the frequency reference signal finally obtains through conversion such as phase-locked, mixing, its signal frequency stability, accuracy and spectral purity are also higher.
The 3rd, the utility model embodiment adopts single-chip microcomputer frequency controller and host computer to communicate, but the required signal of flexible choice is exported, and selects the L-band signal through the FM signal under some frequency of mixing output X-band, realizes the needs of X-band multifrequency point combination of frequency.
Description of drawings
Fig. 1 shows the structured flowchart of a kind of microwave signal source embodiment 1 of the utility model;
Fig. 2 shows the flow chart of steps of the embodiment of the method for a kind of microwave signal generation of the utility model.
Embodiment
For above-mentioned purpose of the present utility model, feature and advantage can be become apparent more, below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Embodiment one
With reference to Fig. 1, show the structured flowchart of a kind of microwave signal source embodiment 1 of the utility model, can comprise:
Highly stable crystal oscillator 101 is for generation of the channelized frequencies reference signal;
In the present embodiment, can adopt low frequency (100MHz) high stable, the low crystal oscillator (TCXO) of making an uproar mutually to produce a plurality of frequency reference signals, also can adopt TCXO to generate a frequency reference signal and minute multichannel output.
Particularly, the frequency reference signal is that microwave signal source is the microwave signal reference signal commonly used that produces desired parameters, based on the frequency reference signal, carries out corresponding conversion and processing, can allow the microwave signal of output have some character of frequency reference signal.
For example, in the present embodiment, can adopt high stable, the low crystal oscillator of making an uproar mutually to produce the channelized frequencies reference signal, based on the frequency reference signal, conversion and the processing such as that the microwave signals such as FM signal, X-band lockin signal and L-band point-frequency signal that the oscillator of correspondence is produced are carried out is phase-locked, frequency division and filtering, output signal frequency stability and accuracy can be approached with the frequency reference signal or identical, to satisfy preferably the user to the requirement of the microwave signal quality that microwave signal source was produced.
First order mixing and filtering assembly 103 is used for described FM signal and X-band lockin signal are carried out mixing, output X-band FM signal;
Second level mixing and filtering assembly 104 is used for described L-band point-frequency signal and X-band FM signal are carried out mixing, the FM signal under the output X-band point frequency.
So-called " mixing " refers to the signal multiplication with two frequencies, obtains and frequency signal or difference frequency signal, and it all is feasible that those skilled in the art adopt any device to carry out mixing, and the utility model embodiment need not this to be limited.
In the utility model embodiment, owing to adopted highly stable crystal oscillator, the frequency reference signal stabilization that produces is high, phase noise is extremely low, L-band point-frequency signal based on the generation of frequency reference signal, FM signal and X-band lockin signal frequency stability can approach with the frequency reference signal with accuracy even be identical, FM signal under final some frequency of output X-band is by frequency reference signal and L-band point-frequency signal, FM signal and the conversion of X-band lockin signal, its phase noise is extremely low, can reach under best-case or near the level of reference signal.In addition, the device low price that the microwave signal source that proposes among the utility model embodiment adopts, whole microwave signal source cost is low, and general user uses the restriction that can not be subject to price.
Embodiment two
The invention also discloses a kind of microwave signal source embodiment 2, specifically can comprise:
Highly stable crystal oscillator is for generation of the channelized frequencies reference signal;
In practice, can adopt low frequency (100MHz) high stable, the low crystal oscillator (TCXO) of making an uproar mutually to produce a frequency reference signal and minute multichannel output.
Signal component output is used for generating respectively FM signal based on described channelized frequencies reference signal, X-band lockin signal and L-band point-frequency signal;
In a kind of preferred embodiment of the present utility model, described signal component output can comprise with lower unit:
FM PLL cell S 201 for generation of FM signal, and is carried out described FM signal and one tunnel frequency reference signal wherein phase-locked, obtains to satisfy the FM signal of designated carrier frequency and frequency modulation deviation;
Use the utility model embodiment, FM signal and the frequency reference signal that produces carried out phase-locked, can be identical with the frequency reference signal with accuracy so that export the frequency stability of FM signal.
As the concrete a kind of example used of the utility model embodiment, described FM PLL cell S 201 can comprise voltage controlled oscillator, phase discriminator, frequency divider and low pass filter.
Particularly, industrial normal operation linear frequency modulation according to the linear relationship of the amplitude of frequency modulation deviation and modulation signal, is modulated VCXO with modulation signal, can produce 1 fixedly FM signal of frequency deviation, output after processing through frequency division, filtering etc.In the utility model embodiment, the FM PLL unit can adopt the devices such as 1600MHz voltage controlled oscillator (VCO), phase discriminator, frequency divider, low pass filter to form, modulate the 1600MHz signal that VCO can produce a certain fixedly frequency modulation deviation with the modulation signal that external circuit produces, usually this frequency modulation deviation is the order of magnitude of KHz, such as the fixedly frequency modulation deviation of 125kHz; Through the processing of phase-locked loop phase discriminator, frequency divider and low pass filter, can produce carrier frequency and be 200MHz, the fixing FM signal of frequency modulation deviation.
X-band pulsating medium phase locked source cell S 202 for generation of the X-band local oscillation signal, and is carried out described X-band local oscillation signal and one tunnel frequency reference signal wherein phase-locked, obtains the X-band lockin signal;
Use the utility model embodiment, X-band local oscillation signal and the frequency reference signal that produces carried out phase-locked, can be identical with the frequency reference signal with accuracy so that export the frequency stability of X-band lockin signal.
As the concrete a kind of example used of the utility model embodiment, described X-band pulsating medium phase locked source cell S 202 can comprise X-band dielectric oscillator, phase discriminator, frequency divider and filter etc.
L-band local oscillator cell S 203 for generation of n the L-band microwave signal that frequency is different, is carried out phase-lockedly with described remaining n road frequency reference signal described n L-band microwave signal respectively, obtains n L-band point-frequency signal; According to one of them L-band point-frequency signal of FREQUENCY CONTROL command selection that host computer transmits, wherein, described n is the integer more than or equal to 1.
As the concrete a kind of example used of the utility model embodiment, described L-band local oscillator unit comprises: n independent phase-locked oscillator, single-chip microcomputer frequency controller and corresponding microwave single pole multiple throw.
The main distinction of present embodiment and embodiment shown in Figure 1 is that the circuit that produces the L-band point-frequency signal in the present embodiment can be for a plurality of.
For example, L-band local oscillator unit can be comprised of single-chip microcomputer frequency controller (comprising the RS485 serial ports), microwave SP3T switch and 3 tunnel independence phase-locked oscillators.The frequency reference signal is input in 3 tunnel independence phase-locked oscillators, through phase-locked, can produces respectively the point-frequency signal of the different L-band of 3 frequencies; The single-chip microcomputer frequency controller is by the RS485 serial ports, communicate with host computer, the FREQUENCY CONTROL order that sends is understood, and program control selection microwave single knife switch state, the work of three oscillators of control is exported for one in 3 L-band point-frequency signals selecting to produce.
First order mixing and filtering assembly is used for described FM signal and X-band lockin signal are carried out mixing, output X-band FM signal;
In a kind of preferred embodiment of the present utility model, described first order mixing and filtering assembly 203 can comprise with lower member:
Frequency mixer is used for FM signal and the X-band pulsating medium phase locked source unit generation X-band lockin signal of the output of described FM PLL unit are carried out mixing, produces the X-band FM signal;
The filter and amplification assembly, after described X-band FM signal being carried out filtering and amplification, the X-band FM signal of the default power of output.
Particularly, the X-band FM signal that produces after can adopting the devices such as amplifier, filter to mixing is amplified and filtering, the X-band FM signal of the default power of output.
Second level mixing and filtering assembly is used for described L-band point-frequency signal and X-band FM signal are carried out mixing, the FM signal under the output X-band point frequency.
In actual applications, be the microwave signal source of one of a plurality of frequencies of X-band for a kind of carrier frequency frequency that can realize is provided, can select the L-band signal, through realizing the needs of X-band multifrequency point combination of frequency after the mixing.In specific implementation, described second level mixing and filtering assembly can also arrange fixed amplitude circuit, with control output signal power in desired scope.
In a kind of preferred embodiment of the present utility model, described second level mixing and filtering assembly can comprise with lower member:
The X-band frequency mixer is used for described L-band point-frequency signal and X-band FM signal are carried out mixing, produces the FM signal under the X-band point frequency;
The filter and amplification barrier assembly, after the FM signal under the described X-band point frequency is carried out filtering, amplification and isolation, the FM signal under the X-band point frequency of the default power of output.
In the present embodiment, described microwave signal source can guarantee that the frequency modulation deviation of FM signal immobilizes under a plurality of different carrier frequencies when guaranteeing that extremely low phase noise requires, and very little by (≤1 * 10 with the ratio of carrier frequency frequency
-5).The microwave signal source of its global design forecast scheme configuration adopts multiple oscillation and mixing mode, clutter suppresses can be less than-the 70dBc requirement, the signal phase noise of output is limited by the frequency reference signal, the output signal frequency band is relevant with filter band, and signal quality has met or exceeded general user's requirement.
Embodiment three
With reference to Fig. 2, show the flow chart of steps of the embodiment of the method for a kind of microwave signal generation of the utility model, can may further comprise the steps:
Step 301 produces the channelized frequencies reference signal;
Step 302 generates respectively FM signal based on described channelized frequencies reference signal, X-band lockin signal and L-band point-frequency signal;
In a kind of preferred embodiment of the present utility model, described step 302 can comprise following substep:
Substep S321 produces FM signal, and described FM signal and one tunnel frequency reference signal is wherein carried out phase-locked, obtains to satisfy the FM signal of designated carrier frequency and frequency modulation deviation;
Substep S322 produces the X-band local oscillation signal, and described X-band local oscillation signal and one tunnel frequency reference signal is wherein carried out phase-locked, obtains the X-band lockin signal;
Substep S323 produces n the L-band microwave signal that frequency is different, carries out phase-lockedly with described remaining n road frequency reference signal described n L-band microwave signal respectively, obtains n L-band point-frequency signal; According to one of them L-band point-frequency signal of FREQUENCY CONTROL command selection that host computer transmits, wherein, described n is the integer more than or equal to 2.
Step 303 is carried out mixing with described FM signal and X-band lockin signal, output X-band FM signal;
In a kind of preferred embodiment of the present utility model, described step 303 can comprise following substep:
Substep S331 carries out mixing with described FM signal and X-band lockin signal, produces the X-band FM signal;
Substep S332, after described X-band FM signal carried out filtering and amplify, the X-band FM signal of the default power of output.
Step 304 is carried out mixing with described L-band point-frequency signal and X-band FM signal, the FM signal under the output X-band point frequency.
In a kind of preferred embodiment of the present utility model, described step 304 can comprise following substep:
Substep S341 carries out mixing with described L-band point-frequency signal and X-band FM signal, produces the FM signal under the X-band point frequency;
Substep S342, after lower FM signal is carried out filtering, amplification and isolation frequently to described X-band point, the FM signal under the X-band point frequency of the default power of output.
For embodiment of the method, because itself and device embodiment basic simlarity, so description is fairly simple, relevant part gets final product referring to the part explanation of device embodiment.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.
Although described preferred embodiment of the present utility model, in a single day those skilled in the art get the basic creative concept of cicada, then can make other change and modification to these embodiment.So claims are intended to all changes and the modification that are interpreted as comprising preferred embodiment and fall into the utility model scope.
At last, also need to prove, in this article, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby not only comprise those key elements so that comprise process, method, article or the equipment of a series of key elements, but also comprise other key elements of clearly not listing, or also be included as the intrinsic key element of this process, method, article or equipment.Do not having in the situation of more restrictions, the key element that is limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
More than a kind of microwave signal source provided by the utility model is described in detail, used specific case herein principle of the present utility model and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present utility model and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.
Claims (7)
1. a microwave signal source is characterized in that, comprising:
Highly stable crystal oscillator is for generation of the channelized frequencies reference signal;
Signal component output is used for generating respectively FM signal based on described channelized frequencies reference signal, X-band lockin signal and L-band point-frequency signal;
First order mixing and filtering assembly is used for described FM signal and X-band lockin signal are carried out mixing, output X-band FM signal;
Second level mixing and filtering assembly is used for described L-band point-frequency signal and X-band FM signal are carried out mixing, the FM signal under the output X-band point frequency.
2. microwave signal source according to claim 1 is characterized in that, described channelized frequencies reference signal is that described signal component output comprises more than or equal to 3 tunnel frequency reference signals:
The FM PLL unit for generation of FM signal, and carries out described FM signal and one tunnel frequency reference signal wherein phase-locked, obtains to satisfy the FM signal of designated carrier frequency and frequency modulation deviation;
X-band pulsating medium phase locked source unit for generation of the X-band local oscillation signal, and carries out described X-band local oscillation signal and one tunnel frequency reference signal wherein phase-locked, obtains the X-band lockin signal;
L-band local oscillator unit for generation of n the L-band microwave signal that frequency is different, carries out phase-lockedly with remaining n road frequency reference signal described n L-band microwave signal respectively, obtains n L-band point-frequency signal; According to one of them L-band point-frequency signal of FREQUENCY CONTROL command selection that host computer transmits, wherein, described n is the integer more than or equal to 1.
3. microwave signal source according to claim 2 is characterized in that, described FM PLL unit comprises voltage controlled oscillator, phase discriminator, frequency divider and low pass filter.
4. microwave signal source according to claim 2 is characterized in that, described X-band pulsating medium phase locked source unit comprises X-band dielectric oscillator, phase discriminator, frequency divider and filter.
5. microwave signal source according to claim 2 is characterized in that, described L-band local oscillator unit comprises: n independent phase-locked oscillator, single-chip microcomputer frequency controller and microwave single knife switch.
6. microwave signal source according to claim 1 is characterized in that, described first order mixing and filtering assembly comprises:
Frequency mixer is used for FM signal and the X-band pulsating medium phase locked source unit generation X-band lockin signal of the output of described FM PLL unit are carried out mixing, produces the X-band FM signal;
The filter and amplification assembly, after described X-band FM signal being carried out filtering and amplification, the X-band FM signal of the default power of output.
7. microwave signal source according to claim 1 is characterized in that, described second level mixing and filtering assembly comprises:
The X-band frequency mixer is used for described L-band point-frequency signal and X-band FM signal are carried out mixing, produces the FM signal under the X-band point frequency;
The filter and amplification barrier assembly, after the FM signal under the described X-band point frequency is carried out filtering, amplification and isolation, the FM signal under the X-band point frequency of the default power of output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320230367 CN203243310U (en) | 2013-04-28 | 2013-04-28 | Microwave signal source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320230367 CN203243310U (en) | 2013-04-28 | 2013-04-28 | Microwave signal source |
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| CN203243310U true CN203243310U (en) | 2013-10-16 |
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| CN 201320230367 Withdrawn - After Issue CN203243310U (en) | 2013-04-28 | 2013-04-28 | Microwave signal source |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103297044A (en) * | 2013-04-28 | 2013-09-11 | 中国人民解放军95989部队 | Microwave signal source and method for producing microwave signal |
| CN113794495A (en) * | 2021-08-18 | 2021-12-14 | 上海卫星工程研究所 | High-integration high-reliability high-stability frequency source design method and system for deep space exploration |
-
2013
- 2013-04-28 CN CN 201320230367 patent/CN203243310U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103297044A (en) * | 2013-04-28 | 2013-09-11 | 中国人民解放军95989部队 | Microwave signal source and method for producing microwave signal |
| CN103297044B (en) * | 2013-04-28 | 2017-02-15 | 中国人民解放军95989部队 | Microwave signal source and method for producing microwave signal |
| CN113794495A (en) * | 2021-08-18 | 2021-12-14 | 上海卫星工程研究所 | High-integration high-reliability high-stability frequency source design method and system for deep space exploration |
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