CN220732756U - Frequency synthesizer and device for C-band agile frequency conversion - Google Patents
Frequency synthesizer and device for C-band agile frequency conversion Download PDFInfo
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- CN220732756U CN220732756U CN202321869729.3U CN202321869729U CN220732756U CN 220732756 U CN220732756 U CN 220732756U CN 202321869729 U CN202321869729 U CN 202321869729U CN 220732756 U CN220732756 U CN 220732756U
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Abstract
The utility model discloses a frequency synthesizer and a device for C-band agility, relating to the technical field of frequency synthesis; the frequency synthesizer comprises a constant-temperature crystal oscillator, a reference phase-locked loop, a digital frequency synthesizer DDS, a local oscillator phase-locked loop and a mixer, wherein the constant-temperature crystal oscillator, the reference phase-locked loop, the digital frequency synthesizer DDS and the mixer are sequentially and electrically connected; the device comprises a controller and the frequency synthesizer for C-band agility, wherein the controller is electrically connected with the frequency synthesizer; the C-band agility is realized through a constant-temperature crystal oscillator, a reference phase-locked loop, a digital frequency synthesizer DDS, a local oscillator phase-locked loop and a mixer.
Description
Technical Field
The present utility model relates to the field of frequency synthesis technology, and in particular, to a frequency synthesizer and device for C-band agile frequency conversion.
Background
The writer searches for a search equation (tacd= (digital frequency synthesizer AND phase-locked loop AND mixer AND band pass filter AND amplifier AND C band)), AND obtains a closer prior art solution as follows.
The application publication number is CN110868210a, and is named as a frequency synthesis method and a frequency synthesis device, hereinafter referred to as reference 1. The device comprises a constant-temperature crystal oscillator, a local oscillator signal generator, a digital frequency synthesizer, a mixer, a first band-pass filter, a frequency multiplier, a second band-pass filter and a driving amplifier; the constant-temperature crystal oscillator provides a high-stability clock signal for the local oscillation signal generator; the mixer receives output signals of the local oscillation signal generator and the digital frequency synthesizer and carries out mixing processing, and the generated mixed signals sequentially pass through the first band-pass filter, the frequency multiplier, the second band-pass filter and the driving amplifier which are sequentially connected and then are output. The method has the advantages of frequency multiplication, frequency mixing, phase-locked loop and direct digital frequency synthesis, and has the characteristics of short agile time, high frequency, large bandwidth, and excellent flatness and phase noise.
The authorized bulletin number is CN203399086U, which is named as a frequency source based on DDS harmonic extraction technology, and is hereinafter referred to as comparison document 2. Aiming at the defects of large output spurious and complex structure of a frequency source formed by DDS devices in the prior art, the frequency source based on the DDS harmonic extraction technology is provided. The frequency source of the DDS comprises an oscillator, a control system, a DDS, a harmonic frequency selection circuit, an amplifier, a band-pass filter and a frequency multiplier; the harmonic frequency selection circuit is connected with the DDS, extracts the DDS output frequency higher harmonic signal and inputs the signal into the amplifier; the band-pass filter is connected with the amplifier, and is used for filtering the output signal of the amplifier to remove out-of-band interference signals; the frequency multiplier is connected with the filter and is used for carrying out frequency multiplication processing on the output signal of the filter so as to improve the frequency of the signal. The frequency doubling link is shortened, the circuit structure is simplified, and the cost and the energy consumption are reduced.
In combination with the two patent documents and the prior art, the inventors analyzed the prior art as follows.
The frequency agility of the existing digital phase-locked loop is difficult to achieve on the output frequency, the frequency changing time of the conventional digital phase-locked loop is more than tens of microseconds, and the frequency changing time below tens of microseconds is difficult to achieve. The problems at the present stage are as follows:
1. the output frequency switching time is long, and the requirement of the system on frequency agility cannot be met.
2. The output frequency of the single DDS is lower, and the requirement of the system on the frequency cannot be met.
Problems and considerations in the prior art:
how to solve the technical problem of long frequency conversion time of the C wave band.
Disclosure of Invention
The utility model provides a frequency synthesizer and a device for C-band agility, which solve the technical problem of long C-band frequency conversion time.
In order to solve the technical problems, the technical scheme adopted by the utility model is as follows:
the frequency synthesizer for C-band agility comprises a constant-temperature crystal oscillator, a reference phase-locked loop, a digital frequency synthesizer DDS, a local oscillator phase-locked loop and a mixer, wherein the constant-temperature crystal oscillator, the reference phase-locked loop, the digital frequency synthesizer DDS and the mixer are sequentially and electrically connected, and the constant-temperature crystal oscillator, the local oscillator phase-locked loop and the mixer are sequentially and electrically connected.
The further technical proposal is that: the constant-temperature crystal oscillator is 100 MHz.
The further technical proposal is that: the local oscillator phase-locked loop is a digital fractional frequency phase-locked loop.
The further technical proposal is that: the mixer is electrically connected with the first band-pass filter.
The further technical proposal is that: the amplifier is further included, and the first band-pass filter is electrically connected with the amplifier.
The further technical proposal is that: the amplifier is electrically connected with the second band-pass filter.
The device for C-band frequency agility comprises a controller and the frequency synthesizer for C-band frequency agility, wherein the controller is electrically connected with the frequency synthesizer.
The further technical proposal is that: the frequency synthesizer also comprises a power supply, wherein the power supply is electrically connected with the controller, and the power supply is electrically connected with the frequency synthesizer.
The beneficial effects of adopting above-mentioned technical scheme to produce lie in:
first, a frequency synthesizer for C-band agility includes constant temperature crystal oscillator, reference phase-locked loop, digital frequency synthesizer DDS, local oscillator phase-locked loop and mixer, and constant temperature crystal oscillator, reference phase-locked loop, digital frequency synthesizer DDS and mixer are electric connection in proper order, and constant temperature crystal oscillator, local oscillator phase-locked loop and mixer are electric connection in proper order. According to the technical scheme, C-band agility is realized through a constant-temperature crystal oscillator, a reference phase-locked loop, a digital frequency synthesizer DDS, a local oscillator phase-locked loop and a mixer.
Second, an apparatus for C-band agility includes a controller and the above-described frequency synthesizer for C-band agility, the controller being electrically connected to the frequency synthesizer. According to the technical scheme, C-band agility is realized through a constant-temperature crystal oscillator, a reference phase-locked loop, a digital frequency synthesizer DDS, a local oscillator phase-locked loop and a mixer.
See the description of the detailed description section.
Drawings
FIG. 1 is a schematic block diagram of embodiment 1 of the present utility model;
FIG. 2 is a functional block diagram of embodiment 2 of the present utility model;
fig. 3 is a schematic block diagram of embodiment 3 of the present utility model.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present application is not limited to the specific embodiments disclosed below.
Example 1:
as shown in fig. 1, the utility model discloses a device for C-band agility, which comprises a controller, a power supply, a thermostatic crystal oscillator, a reference phase-locked loop, a digital frequency synthesizer DDS, a local oscillator phase-locked loop, a mixer, a first band-pass filter, an amplifier and a second band-pass filter, wherein the thermostatic crystal oscillator is a 100MHz thermostatic crystal oscillator, and the local oscillator phase-locked loop is a digital fractional frequency-division phase-locked loop.
The constant temperature crystal oscillator, the reference phase-locked loop, the digital frequency synthesizer DDS and the mixer are sequentially and electrically connected, the constant temperature crystal oscillator, the local oscillator phase-locked loop and the mixer are sequentially and electrically connected, the mixer is electrically connected with the first band-pass filter, the first band-pass filter is electrically connected with the amplifier, the amplifier is electrically connected with the second band-pass filter, and the constant temperature crystal oscillator, the reference phase-locked loop, the digital frequency synthesizer DDS, the local oscillator phase-locked loop, the mixer, the first band-pass filter, the amplifier and the second band-pass filter form the frequency synthesizer.
The controller is electrically connected with the frequency synthesizer, and the power supply is electrically connected with the controller and the frequency synthesizer respectively.
The controller is a single chip microcomputer, and the constant temperature crystal oscillator, the reference phase-locked loop, the digital frequency synthesizer DDS, the local oscillator phase-locked loop, the mixer, the first band-pass filter, the amplifier, the second band-pass filter, the controller and the corresponding communication connection technology are not described in detail in the prior art.
Example 2:
as shown in fig. 2, the utility model discloses a frequency synthesizer for C-band agility, which comprises a constant temperature crystal oscillator, a reference phase-locked loop, a digital frequency synthesizer DDS, a local oscillator phase-locked loop, a mixer, a first band-pass filter, an amplifier and a second band-pass filter, wherein the constant temperature crystal oscillator is a constant temperature crystal oscillator of 100MHz, and the local oscillator phase-locked loop is a digital fractional frequency-division phase-locked loop.
The constant temperature crystal oscillator, the reference phase-locked loop, the digital frequency synthesizer DDS and the mixer are sequentially and electrically connected, the constant temperature crystal oscillator, the local oscillator phase-locked loop and the mixer are sequentially and electrically connected, the mixer is electrically connected with the first band-pass filter, the first band-pass filter is electrically connected with the amplifier, the amplifier is electrically connected with the second band-pass filter, and the constant temperature crystal oscillator, the reference phase-locked loop, the digital frequency synthesizer DDS, the local oscillator phase-locked loop, the mixer, the first band-pass filter, the amplifier and the second band-pass filter form the frequency synthesizer.
The controller is a single chip microcomputer, and the constant temperature crystal oscillator, the reference phase-locked loop, the digital frequency synthesizer DDS, the local oscillator phase-locked loop, the mixer, the first band-pass filter, the amplifier, the second band-pass filter and the corresponding communication connection technology are not described in detail in the prior art.
Example 3:
as shown in fig. 3, the utility model discloses a frequency synthesizer for C-band agility, which comprises a constant temperature crystal oscillator, a reference phase-locked loop, a digital frequency synthesizer DDS, a local oscillator phase-locked loop and a mixer, wherein the constant temperature crystal oscillator is a constant temperature crystal oscillator of 100MHz, and the local oscillator phase-locked loop is a digital fractional frequency-division phase-locked loop.
The constant-temperature crystal oscillator, the reference phase-locked loop, the digital frequency synthesizer DDS and the mixer are sequentially and electrically connected, and the constant-temperature crystal oscillator, the reference phase-locked loop, the digital frequency synthesizer DDS, the local oscillator phase-locked loop and the mixer form a frequency synthesizer.
The controller is a single chip microcomputer, and the constant temperature crystal oscillator, the reference phase-locked loop, the digital frequency synthesizer DDS, the local oscillator phase-locked loop, the mixer and the corresponding communication connection technology are not described in detail in the prior art.
In example 3, the mixer was electrically connected to a first bandpass filter, the first bandpass filter was electrically connected to an amplifier, and the amplifier was electrically connected to a second bandpass filter.
The research and development process comprises the following steps:
the project name is a DDS-based small-step C-band agile frequency synthesizer.
The small stepping agile frequency synthesizer based on the DDS and the phase-locked loop is simple and reliable in principle and strong in realizability. The method is mainly used for communication, instrument and meter directions.
The frequency of the prior digital phase-locked loop is difficult to achieve agility in output frequency, the frequency of the conventional digital phase-locked loop is more than tens of microseconds, the frequency of the DDS is very difficult to achieve less than tens of microseconds, the DDS has natural advantages in this aspect, the frequency of the DDS is generally about hundreds of nanoseconds, and the rapid switching of the frequency can be achieved. The output of a higher frequency band is realized by a method of combining the DDS and the digital phase-locked loop, so that the frequency required by practical application is achieved.
The problems at the present stage are as follows:
1. the output frequency switching time is long, and the requirement of the system on frequency agility cannot be met.
2. The output frequency of the single DDS is lower, and the requirement of the system on the frequency cannot be met.
The concept of the present application:
the ADF4350 is adopted as a reference phase-locked loop to provide a reference clock for the DDS, and the DDS in the scheme adopts an AD9911 device of an AD company. The other phase-locked loop also adopts ADF4350 as the local oscillation phase-locked loop and AD9911 output frequency to mix and filter and then output the required final frequency. Small steps in frequency can be achieved by controlling the AD9911 output. The reference clock of the scheme uniformly adopts a constant-temperature crystal oscillator of 100MHz as a reference signal.
The technical contribution of the present application:
after the writer communicates with the inventor, the project group considers that the technical contribution of the project is a combination of a constant-temperature crystal oscillator, a reference phase-locked loop, a digital frequency synthesizer DDS, a local oscillator phase-locked loop and a mixer, and the combination is basically different and is not easy to think about compared with the prior art scheme.
The difference between the utility model and the comparison document 1 is that the utility model does not adopt a local oscillation signal generator, a frequency divider and a low-pass filter, and a constant-temperature crystal oscillator of 100 MHz. The comparison document 1 employs a local oscillator signal generator and frequency divider 2 and a low pass filter 6. The local oscillator phase-locked loop is adopted to be a digital fractional frequency-division phase-locked loop, and the precision and the index are better.
Compared with the comparison document 2, the utility model is different in that one path of the utility model adopts a reference phase-locked loop and the other path adopts a local oscillation phase-locked loop.
The technical scheme is as follows:
the scheme overcomes the defects of high spurious output and long frequency conversion time of the digital phase-locked loop in a small stepping way, and can realize low spurious output, frequency agility and small frequency stepping by adopting a mixed frequency phase-locked loop mode of combining the digital phase-locked loop and the DDS, so that the implementation scheme is not particularly complex, the reliability is high, the volume is small, the miniaturization is easy, and the application prospect is wide. The reference loop mainly generates a reference clock of the DDS when the reference input is 100MHz, the reference clock generates an output small-step agile signal after passing through the DDS, the signal is mixed with a fixed local oscillator after being amplified and filtered, and a final output frequency is generated, and the frequency is finally output after being filtered and amplified.
After the application is run for a period of time internally, the feedback of field technicians is beneficial in that:
the scheme mainly has the advantages of small steps, low stray and miniaturization and low cost, can meet most of application requirements, and has a wide application space.
At present, the technical scheme of the utility model has been subjected to pilot-scale test, namely, smaller-scale test of products before large-scale mass production; after the pilot test is completed, the use investigation of the user is performed in a small range, and the investigation result shows that the user satisfaction is higher; now, the preparation of the formal production of the product for industrialization (including intellectual property risk early warning investigation) is started.
Claims (8)
1. A frequency synthesizer for C-band agile frequency conversion, characterized by: the device comprises a constant-temperature crystal oscillator, a reference phase-locked loop, a digital frequency synthesizer DDS, a local oscillator phase-locked loop and a mixer, wherein the constant-temperature crystal oscillator, the reference phase-locked loop, the digital frequency synthesizer DDS and the mixer are sequentially and electrically connected.
2. A frequency synthesizer for C-band agile according to claim 1, wherein: the constant-temperature crystal oscillator is 100 MHz.
3. A frequency synthesizer for C-band agile according to claim 1, wherein: the local oscillator phase-locked loop is a digital fractional frequency phase-locked loop.
4. A frequency synthesizer for C-band agile according to claim 1, wherein: the mixer is electrically connected with the first band-pass filter.
5. A frequency synthesizer for C-band agile according to claim 4, wherein: the amplifier is further included, and the first band-pass filter is electrically connected with the amplifier.
6. A frequency synthesizer for C-band agile according to claim 5, wherein: the amplifier is electrically connected with the second band-pass filter.
7. A device for C-band agility, characterized by: a frequency synthesizer for C-band agile comprising a controller and the frequency synthesizer of any one of claims 1 to 6, the controller being electrically connected to the frequency synthesizer.
8. An apparatus for C-band agile as set forth in claim 7, wherein: the frequency synthesizer also comprises a power supply, wherein the power supply is electrically connected with the controller, and the power supply is electrically connected with the frequency synthesizer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321869729.3U CN220732756U (en) | 2023-07-17 | 2023-07-17 | Frequency synthesizer and device for C-band agile frequency conversion |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321869729.3U CN220732756U (en) | 2023-07-17 | 2023-07-17 | Frequency synthesizer and device for C-band agile frequency conversion |
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| CN220732756U true CN220732756U (en) | 2024-04-05 |
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| CN202321869729.3U Active CN220732756U (en) | 2023-07-17 | 2023-07-17 | Frequency synthesizer and device for C-band agile frequency conversion |
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