CN208569026U - A kind of radio-frequency transmissions source system of amplitude-controllable - Google Patents
A kind of radio-frequency transmissions source system of amplitude-controllable Download PDFInfo
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- CN208569026U CN208569026U CN201821187361.1U CN201821187361U CN208569026U CN 208569026 U CN208569026 U CN 208569026U CN 201821187361 U CN201821187361 U CN 201821187361U CN 208569026 U CN208569026 U CN 208569026U
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Abstract
The utility model relates to a kind of radio-frequency transmissions source systems of amplitude-controllable, Direct Digital Frequency Synthesizers, radio frequency amplifier, numerical-control attenuator and video following device including the connection of sequentially signal, the Direct Digital Frequency Synthesizers and the equal signal of numerical-control attenuator are connected with microcontroller, and the Direct Digital Frequency Synthesizers are also connected with constant-temperature crystal oscillator.The utility model passes through setting constant-temperature crystal oscillator, the stability and accuracy of radiofrequency signal output are demonstrate,proved, and utilize Direct Digital Frequency Synthesizers, the advantage that frequency conversion is fast, high resolution, the purity of frequency spectrum are high, rate-adaptive pacemaker range is wide can be achieved, and reduce temperature drift, the output area of frequency is wide and amplitude is also adjustable, realizes high-precision, the output of the radiofrequency signal of high stability.
Description
Technical field
The utility model relates to signal processing systems, belong to optical signal detection technical field, more particularly to
A kind of radio-frequency transmissions source system of amplitude-controllable.
Background technique
Radio-frequency signal source is one of the surveying instrument of frequency microwave worker's indispensability, is hyundai electronics test macro
To the performance test of aerospace remote-measuring equipment-telemetering sampler and coder, radio frequency letter in important component, such as aerospace field
Number source will be tested for telemetering sampler and coder and provide reliable standard analog signal, for testing the various performances of telemetering sampler and coder.It
Radiofrequency signal can be mainly exported, certainly with thunder according to the radiofrequency signal of the setting output different frequency amplitude of user
Up to etc. technologies development, to signal source, more stringent requirements are proposed, frequency stability of the electronic testing instrument to radio-frequency signal source
It is higher and higher with the requirement of accuracy.Radio-frequency signal source is component part important in microwave system, it, which will have a direct impact on, is
Precision of uniting and the core of temperature stability and microwave system work.
Utility model content
Based on the above technical problem, the utility model provides a kind of radio-frequency transmissions source system of amplitude-controllable, to solve
It has determined the technical problem that previous system temperature drift is big, precision is low and stability is poor.
In order to solve the above technical problems, the technical solution adopted in the utility model is as follows:
A kind of radio-frequency transmissions source system of amplitude-controllable, the Direct Digital Frequency Synthesizers connected including sequentially signal are penetrated
Audio amplifier, numerical-control attenuator and video following device, the Direct Digital Frequency Synthesizers are connected with the equal signal of numerical-control attenuator
There is microcontroller, the Direct Digital Frequency Synthesizers are also connected with constant-temperature crystal oscillator.
Based on system above, the microcontroller is also connected with encoder, serial ports and charactron.
Based on system above, the video following device is provided with antenna.
Based on system above, the temperature drift of the constant-temperature crystal oscillator is less than 0.5ppb.
Based on system above, the microcontroller selects CC2530F256 type microprocessor.
In conclusion by adopting the above-described technical solution, the beneficial effects of the utility model are: the utility model passes through
Constant-temperature crystal oscillator is set, has demonstrate,proved the stability and accuracy of radiofrequency signal output, and utilize Direct Digital Frequency Synthesizers,
The advantage that frequency conversion is fast, high resolution, the purity of frequency spectrum are high, rate-adaptive pacemaker range is wide can be achieved, and reduce temperature drift, frequency
Output area is wide and amplitude is also adjustable, realizes high-precision, the output of the radiofrequency signal of high stability.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model；
Fig. 2 is the circuit connection diagram of the utility model High Linear programmable attenuator；
Fig. 3 is the circuit connection diagram of Direct Digital Frequency Synthesizers schematic diagram.
Specific embodiment
The utility model will be further described below with reference to the accompanying drawings.The embodiments of the present invention includes but unlimited
In the following example.
Embodiment
As shown in Figure 1-Figure 3, the radio-frequency transmissions source system of a kind of amplitude-controllable, the Direct Digital including the connection of sequentially signal
Frequency synthesizer, radio frequency amplifier, numerical-control attenuator and video following device, the Direct Digital Frequency Synthesizers and numerical control attenuation
The equal signal of device is connected with microcontroller, and the Direct Digital Frequency Synthesizers are also connected with constant-temperature crystal oscillator；The micro-control
Device processed is also connected with encoder, serial ports and charactron；The video following device is provided with antenna；The constant-temperature crystal oscillator
Temperature drift is less than 0.5ppb；The microcontroller selects CC2530F256 type microprocessor.
The present embodiment is less than 0.5ppb high stable constant-temperature crystal oscillator (OCXO) using temperature drift and is used as Direct Digital Frequency Synthesizers
(DDS) clock ensure that the stability and accuracy of radiofrequency signal output, DDS controllable, frequency conversion with programmable phase
Fastly, the excellent performances such as high resolution, the purity of frequency spectrum are high, rate-adaptive pacemaker range is wide.DDS, which is controlled, by microcontroller generates high-resolution
Rate, the high radiofrequency signal of the purity of frequency spectrum are amplified to fixed amplitude, are passing through by radiofrequency signal by low noise radio frequency amplifier
The radio frequency programmable attenuator of High Linear controls output amplitude, then by output signal by radio frequency follower, radio frequency follower is main
Effect is matching rear class impedance, provides certain driving capability, can connect antenna and directly emit.Encoder and serial ports and micro-control
Device connection processed, can send the control signal for needing the frequency and amplitude that export, 4 digits by external control devices to microcontroller
Code pipe can show current output amplitude.
It is as described above the embodiments of the present invention.Each preferred embodiment described previously for the utility model,
Preferred embodiment in each preferred embodiment if not obvious contradictory or premised on a certain preferred embodiment,
Each preferred embodiment can any stack combinations use, the design parameter in the embodiment and embodiment be only for
The utility model verification process of clear statement utility model people, not to limit the scope of patent protection of the utility model,
The scope of patent protection of the utility model is still subject to the claims, all specifications with the utility model and attached
The variation of equivalent structure made by figure content, similarly should be included in the protection scope of the utility model.
Claims (5)
1. a kind of radio-frequency transmissions source system of amplitude-controllable, it is characterised in that: the Direct Digital frequency including the connection of sequentially signal
Synthesizer, radio frequency amplifier, numerical-control attenuator and video following device, the Direct Digital Frequency Synthesizers and numerical-control attenuator are equal
Signal is connected with microcontroller, and the Direct Digital Frequency Synthesizers are also connected with constant-temperature crystal oscillator.
2. a kind of radio-frequency transmissions source system of amplitude-controllable according to claim 1, it is characterised in that: the microcontroller
It is also connected with encoder, serial ports and charactron.
3. a kind of radio-frequency transmissions source system of amplitude-controllable according to claim 1, it is characterised in that: the video following
Device is provided with antenna.
4. a kind of radio-frequency transmissions source system of amplitude-controllable according to claim 1, it is characterised in that: the constant temperature crystal
The temperature drift of oscillator is less than 0.5ppb.
5. a kind of radio-frequency transmissions source system of amplitude-controllable according to claim 1, it is characterised in that: the microcontroller
Select CC2530F256 type microprocessor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821187361.1U CN208569026U (en) | 2018-07-24 | 2018-07-24 | A kind of radio-frequency transmissions source system of amplitude-controllable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821187361.1U CN208569026U (en) | 2018-07-24 | 2018-07-24 | A kind of radio-frequency transmissions source system of amplitude-controllable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208569026U true CN208569026U (en) | 2019-03-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201821187361.1U Active CN208569026U (en) | 2018-07-24 | 2018-07-24 | A kind of radio-frequency transmissions source system of amplitude-controllable |
Country Status (1)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108983171A (en) * | 2018-07-24 | 2018-12-11 | 成都意科科技有限责任公司 | A kind of radio-frequency transmissions source system of amplitude-controllable |
-
2018
- 2018-07-24 CN CN201821187361.1U patent/CN208569026U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108983171A (en) * | 2018-07-24 | 2018-12-11 | 成都意科科技有限责任公司 | A kind of radio-frequency transmissions source system of amplitude-controllable |
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