CN111464181B - Radio frequency signal source - Google Patents
Radio frequency signal source Download PDFInfo
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- CN111464181B CN111464181B CN202010354585.2A CN202010354585A CN111464181B CN 111464181 B CN111464181 B CN 111464181B CN 202010354585 A CN202010354585 A CN 202010354585A CN 111464181 B CN111464181 B CN 111464181B
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- 238000005070 sampling Methods 0.000 claims abstract description 57
- 239000013078 crystal Substances 0.000 claims abstract description 22
- 230000010355 oscillation Effects 0.000 claims description 26
- 238000010586 diagram Methods 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
The invention discloses a radio frequency signal source, which comprises a controller, a crystal oscillator, a digital phase-locking module and a sampling phase-locking module, wherein the crystal oscillator is connected with the digital phase-locking module and the sampling phase-locking module and is used for providing a phase-locking reference signal, the controller is connected with the digital phase-locking module and is used for configuring the digital phase-locking module so as to change the frequency of a first oscillating signal output by the digital phase-locking module, the sampling phase-locking module receives the first oscillating signal and mixes with a radio frequency signal generated by the sampling phase-locking module to generate an intermediate frequency signal, and the sampling phase-locking module takes the intermediate frequency signal as a feedback signal and compares the intermediate frequency signal with the phase-locking reference signal to carry out phase locking of the radio frequency signal.
Description
Technical Field
The embodiment of the invention relates to a communication technology, in particular to a radio frequency signal source.
Background
With the development of modern communication technology, frequency sources are widely used in the fields of microwave communication, navigation, radar, electronic countermeasure, and the like.
The phase-locked loop is an important component in the frequency source integrated module, and is a feedback control circuit, and the main function of the phase-locked loop is to compare the phase of the reference signal with the phase of the oscillation signal generated inside the phase-locked loop, and when the phase difference between the reference signal and the phase of the oscillation signal is changed, the frequency of the oscillation signal generated by the controlled oscillator is changed, so that the frequency and the phase of the oscillation signal (the output signal of the frequency source) generated by the controlled oscillator are kept in a certain relation with the reference signal. The phase-locked loop comprises a digital phase-locked loop and a sampling phase-locked loop. The active digital phase discriminator, frequency divider and other devices adopted by the digital phase-locked loop have higher noise bottoms, and the near carrier frequency phase noise is worse during high-frequency output. The sampling phase-locked loop adopts a passive analog phase discriminator, avoids the noise bottom of a frequency divider and greatly reduces the noise bottom of the phase discriminator, has wide application prospect in the occasions with high frequency and ultralow phase noise requirements, but the output frequency of the sampling phase-locked loop is generally fixed to be integral multiple of the reference frequency, and is difficult to be directly applied to the occasions with frequency conversion requirements.
Disclosure of Invention
The invention provides a radio frequency signal source, which can realize phase locking of a high-frequency radio frequency signal and can also adjust the frequency of the radio frequency signal.
The embodiment of the invention provides a radio frequency signal source, which comprises a controller, a crystal oscillator, a digital phase locking module and a sampling phase locking module,
the crystal oscillator is connected with the digital phase locking module and the sampling phase locking module and is used for providing phase locking reference signals,
the controller is connected with the digital phase-locking module and is used for configuring the digital phase-locking module to change the frequency of a first oscillating signal output by the digital phase-locking module,
the sampling phase-locking module receives the first oscillation signal and mixes the first oscillation signal with a radio frequency signal generated by the sampling phase-locking module to generate an intermediate frequency signal, and the sampling phase-locking module compares the intermediate frequency signal serving as a feedback signal with the phase-locking reference signal to carry out phase locking of the radio frequency signal.
Further, the digital phase-locking module comprises a digital phase-discrimination unit, a first filter, a first voltage-controlled oscillator and a first power distributor,
the crystal oscillator is connected with the digital phase discrimination unit, the output signal of the digital phase discrimination unit is input into the first voltage-controlled oscillator through the first filter,
the first power divider is used for dividing the output signal of the first voltage-controlled oscillator into two paths of first oscillation signals, one path of first oscillation signal is input into the digital phase discrimination unit and used as the feedback signal of the first voltage-controlled oscillator, the other path of first oscillation signal is input into the sampling phase-locking module,
the controller is connected with the digital phase discrimination unit and is configured to change the frequency of the first oscillation signal.
Further, the digital phase discrimination unit comprises a first frequency divider, a second frequency divider and a digital phase discriminator,
the crystal oscillator is connected with the digital phase detector through the first frequency divider, the first power divider is connected with the digital phase detector through the second frequency divider,
the digital phase detector is coupled to the first filter,
the controller is connected with the first frequency divider and the second frequency divider, and the controller changes the frequency of the first oscillation signal by configuring the frequency division times of the first frequency divider and the second frequency divider.
Further, the first filter is a loop filter.
Further, the first power divider is a power divider.
Further, the sampling phase-locking module comprises a sampling phase discriminator, a second filter, a second voltage-controlled oscillator, a second power divider, a mixer and a third filter,
the crystal oscillator is connected with the sampling phase discriminator, the output signal of the sampling phase discriminator is input into the second voltage-controlled oscillator through the second filter,
the second power divider is used for dividing the output signal of the second voltage-controlled oscillator into two paths of radio frequency signals, one path of radio frequency signal is directly output, the other path of radio frequency signal is input into the mixer and is mixed with the first oscillating signal to generate the intermediate frequency signal,
and the intermediate frequency signal is input into the sampling phase discriminator after passing through the third filter and is used as a feedback signal of the second voltage-controlled oscillator.
Further, the second filter is a loop filter.
Further, the second power divider is a coupler.
Further, the third filter is a cavity filter.
Compared with the prior art, the invention has the beneficial effects that: the invention provides a radio frequency signal source which comprises a digital phase-locked module and a sampling phase-locked module, wherein a feedback signal in the sampling phase-locked loop is a mixed signal based on an output signal of the digital phase-locked loop, a controller is adopted to actively change the phase difference between a reference signal and the feedback signal in the digital phase-locked loop, so that the frequency of the output signal of the digital phase-locked loop can be changed, the frequency of the mixed signal can be further changed, and finally, the frequency of the radio frequency signal output by the sampling phase-locked module can be changed, so that the radio frequency signal source can be directly applied to occasions with frequency conversion requirements. Meanwhile, the digital phase-locked loop module and the sampling phase-locked module are matched for use, so that the problem of poor phase noise of the near end of the high-frequency microwave signal can be effectively avoided.
Drawings
FIG. 1 is a block diagram of the overall structure of a radio frequency signal source in an embodiment;
FIG. 2 is a block diagram of a digital phase lock module in an embodiment;
FIG. 3 is a block diagram of a digital phase lock unit in an embodiment;
FIG. 4 is a block diagram of a sampling phase lock module in an embodiment.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Example 1
Fig. 1 is a block diagram of the overall structure of a radio frequency signal source in an embodiment, and referring to fig. 1, the radio frequency signal source includes a controller 1, a crystal oscillator 2, a digital phase locking module 3, and a sampling phase locking module 4.
The crystal oscillator 2 is connected with the digital phase locking module 3 and the sampling phase locking module 4 and is used for providing a phase locking reference signal. The controller 1 is connected to the digital phase-locking module 3, and the controller 1 is configured to configure the digital phase-locking module 3 to change the frequency of the first oscillation signal output by the digital phase-locking module 3. The sampling phase-locking module 4 receives the first oscillation signal and mixes with the radio frequency signal generated by the sampling phase-locking module 4 to generate an intermediate frequency signal, and the sampling phase-locking module 4 uses the intermediate frequency signal as a feedback signal to compare with a phase-locking reference signal to perform phase locking of the radio frequency signal.
In this embodiment, the digital phase-locking module 3 is dynamically configured by the controller 1, for example, the frequency of the reference signal received by the digital phase-locking module 3 is changed by the controller 1, or the frequency of the feedback signal received by the digital phase-locking module 3 is changed, when the frequency of the reference signal or the frequency of the feedback signal is changed, the phase difference between the reference signal and the feedback signal is also changed, and thus the control signal of the controlled oscillator in the digital phase-locking module 3 is changed, and the frequency of the output signal of the digital phase-locking module 3 is also changed.
In this embodiment, the radio frequency signal source includes two phase locking modules, namely, a digital phase locking module 3 and a sampling phase locking module 4, wherein the feedback signal in the sampling phase locking module 4 is an intermediate frequency signal obtained by mixing a low frequency signal generated by the digital phase locking module 3 with a high frequency signal generated by the sampling phase locking module 4, when the frequency of the low frequency signal changes, the frequency of the intermediate frequency signal also changes after mixing, and further, the phase difference between the reference signal and the feedback signal in the sampling phase locking module 4 changes, and the frequency of the radio frequency signal generated by the sampling phase locking module 4 also changes.
The radio frequency signal source provided by the embodiment comprises a digital phase-locked module 3 and a sampling phase-locked module 4, wherein the feedback signal in the sampling phase-locked loop is a mixed signal based on the output signal of the digital phase-locked loop, the controller is adopted to actively change the phase difference between the reference signal and the feedback signal in the digital phase-locked loop, so that the frequency of the output signal of the digital phase-locked loop can be changed, the frequency of the mixed signal is further changed, and finally the frequency of the radio frequency signal output by the sampling phase-locked module 4 is changed, so that the radio frequency signal source can be directly applied to occasions with frequency conversion requirements. Meanwhile, the mixing signal of the sampling phase-locking module 4, namely the feedback signal is an intermediate frequency signal, so that the problem that phase locking cannot be carried out when the frequency difference between the reference signal and the feedback signal is too large is effectively avoided.
Fig. 2 is a block diagram of an exemplary digital phase lock module, and fig. 3 is a block diagram of an exemplary digital phase lock unit, referring to fig. 2 and 3, as an embodiment, the digital phase lock module 3 includes a digital phase discrimination unit 31, a first filter 32, a first voltage controlled oscillator 33, and a first power divider 34.
The crystal oscillator 2 is connected to a digital phase discrimination unit 31, and an output signal of the digital phase discrimination unit 31 is input to a first voltage controlled oscillator 33 through a first filter 32. The first power divider 34 is configured to divide the output signal of the first voltage-controlled oscillator 33 into two first oscillation signals, wherein one first oscillation signal is input into the digital phase demodulation unit 31 as a feedback signal of the first voltage-controlled oscillator 33, and the other first oscillation signal is input into the sampling phase-locked module 4.
The controller 1 is connected to the digital phase discrimination unit 31, and the digital phase discrimination unit 31 is configured to change the frequency of the first oscillation signal. Specifically, the digital phase discriminator 31 includes a first frequency divider 301, a second frequency divider 303, and a digital phase discriminator 302, the crystal oscillator 2 is connected to the digital phase discriminator 302 through the first frequency divider 301, the first power divider 34 is connected to the digital phase discriminator 302 through the second frequency divider 303, the digital phase discriminator 302 is connected to the first filter 32, the controller 1 is connected to the first frequency divider 301 and the second frequency divider 303, and the controller 1 changes the frequency of the first oscillation signal by configuring the frequency division times of the first frequency divider 301 and the second frequency divider 303.
For example, the first frequency divider 301 and the second frequency divider 303 are controllable frequency dividers, such as CD4040, and the controller 1 is a single-chip microcomputer, and the single-chip microcomputer can change the frequency division number of the frequency divider through an analog switch, or the single-chip microcomputer can change the frequency division number of the frequency divider by directly configuring a frequency divider register.
Illustratively, the first filter 32 is a loop filter and the first power divider 34 is a power divider. The signal generated by the first voltage controlled oscillator 33 is equally divided into two first oscillating signals by a power divider.
For example, when the digital phase discriminator 302 performs phase locking, the actually adopted reference signal is the crystal oscillator signal after being divided by the first frequency divider 301, the actually adopted feedback signal is the oscillation signal after being divided by the second frequency divider 303, and the digital phase discriminator 302 compares the phase difference between the divided crystal oscillator signal and the divided oscillation signal, so as to adjust the frequency of the signal generated by the first voltage-controlled oscillator 33, and when the frequency of the signal generated by the first voltage-controlled oscillator 33 is stable, the signal frequency and the signal frequency generated by the crystal oscillator satisfy the following formula:
wherein f i Frequency f of signal generated for crystal oscillator 1 To stabilize the frequency of the signal generated by the first voltage controlled oscillator 33, R is the frequency division number of the first frequency divider 301 configurable by the controller 1, and N is the frequency division number of the second frequency divider 303 configurable by the controller 1.
In combination with the above, by changing the values of R and N by the controller 1, the first voltage-controlled oscillator 33 generates the signal f after stabilization 1 Is a frequency of (a) is a frequency of (b).
Fig. 4 is a block diagram of a sampling phase lock module in an embodiment, referring to fig. 4, as an implementation manner, the sampling phase lock module 4 includes a sampling phase detector 41, a second filter 42, a second voltage controlled oscillator 43, a second power divider 44, a mixer 45, and a third filter 46.
The crystal oscillator 2 is connected with the sampling phase discriminator 41, the output signal of the sampling phase discriminator 41 is input into the second voltage-controlled oscillator 43 through the second filter 42, the second power divider 44 is used for dividing the output signal of the second voltage-controlled oscillator 43 into two paths of signals, one path of signals is directly output as a radio frequency signal, the other path of signals is input into the mixer 45 and mixed with the first oscillation signal to generate an intermediate frequency signal, and the intermediate frequency signal is input into the sampling phase discriminator 41 after passing through the third filter 46 and is used as a feedback signal of the second voltage-controlled oscillator 43.
Illustratively, the second filter 42 is a loop filter, the second power divider 44 is a coupler, the third filter 46 is a cavity filter, and the second voltage controlled oscillator 43 is a dielectric voltage controlled oscillator. The signal generated by the second voltage controlled oscillator 43 is divided into two signals with different powers and the same frequency by a coupler, wherein one signal with higher power is used as an output signal of the radio frequency signal source, and the other signal with lower power is used for mixing with the first oscillating signal.
Illustratively, when the frequency of the signal generated by the second voltage controlled oscillator 43 is stable, the intermediate frequency signal frequency and the frequency of the signal generated by the crystal oscillator satisfy the following formula:
and the intermediate frequency signal may be represented by the following formula:
f 2 ＝f 1 +f o
wherein f o As the frequency of the RF signal, the frequency f of the IF signal can be obtained by combining the above formulas when stable 2 Not follow f 1 Is changed to a certain value when f 1 When changing, f 2 And f i The phase difference between the two changes, and the sampling phase detector 41 changes f according to the change of the phase difference o Is corrected so that after the phase lock has stabilized, f 2 And f i The phases are the same, the radio frequency signal f o Is changed.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (6)
1. A radio frequency signal source is characterized by comprising a controller, a crystal oscillator, a digital phase locking module and a sampling phase locking module,
the crystal oscillator is connected with the digital phase locking module and the sampling phase locking module and is used for providing phase locking reference signals,
the controller is connected with the digital phase-locking module and is used for configuring the digital phase-locking module to change the frequency of a first oscillating signal output by the digital phase-locking module,
the sampling phase-locking module receives the first oscillation signal and mixes the first oscillation signal with a radio frequency signal generated by the sampling phase-locking module to generate an intermediate frequency signal, and the sampling phase-locking module compares the intermediate frequency signal serving as a feedback signal with the phase-locking reference signal to carry out phase locking of the radio frequency signal;
the digital phase-locking module comprises a digital phase-discrimination unit, a first filter, a first voltage-controlled oscillator and a first power distributor,
the crystal oscillator is connected with the digital phase discrimination unit, the output signal of the digital phase discrimination unit is input into the first voltage-controlled oscillator through the first filter,
the first power divider is used for dividing the output signal of the first voltage-controlled oscillator into two paths of first oscillation signals, one path of first oscillation signal is input into the digital phase discrimination unit and used as the feedback signal of the first voltage-controlled oscillator, the other path of first oscillation signal is input into the sampling phase-locking module,
the controller is connected with the digital phase discrimination unit and is used for changing the frequency of the first oscillating signal by configuring the digital phase discrimination unit;
the digital phase discrimination unit comprises a first frequency divider, a second frequency divider and a digital phase discriminator,
the crystal oscillator is connected with the digital phase detector through the first frequency divider, the first power divider is connected with the digital phase detector through the second frequency divider,
the digital phase detector is coupled to the first filter,
the controller is connected with the first frequency divider and the second frequency divider, and the controller changes the frequency of the first oscillating signal by configuring the frequency division times of the first frequency divider and the second frequency divider;
the sampling phase-locking module comprises a sampling phase discriminator, a second filter, a second voltage-controlled oscillator, a second power divider, a mixer and a third filter,
the crystal oscillator is connected with the sampling phase discriminator, the output signal of the sampling phase discriminator is input into the second voltage-controlled oscillator through the second filter,
the second power divider is used for dividing the output signal of the second voltage-controlled oscillator into two paths of radio frequency signals, one path of radio frequency signal is directly output, the other path of radio frequency signal is input into the mixer and is mixed with the first oscillating signal to generate the intermediate frequency signal,
and the intermediate frequency signal is input into the sampling phase discriminator after passing through the third filter and is used as a feedback signal of the second voltage-controlled oscillator.
2. The radio frequency signal source of claim 1, wherein the first filter is a loop filter.
3. The radio frequency signal source of claim 1, wherein the first power divider is a power divider.
4. The radio frequency signal source of claim 1, wherein the second filter is a loop filter.
5. The radio frequency signal source of claim 1, wherein the second power divider is a coupler.
6. The radio frequency signal source of claim 1, wherein the third filter is a cavity filter.
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| CN202010354585.2A CN111464181B (en) | 2020-04-29 | 2020-04-29 | Radio frequency signal source |
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| CN202010354585.2A CN111464181B (en) | 2020-04-29 | 2020-04-29 | Radio frequency signal source |
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| CN111464181B true CN111464181B (en) | 2023-09-22 |
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| CN112422125A (en) * | 2021-01-25 | 2021-02-26 | 成都市克莱微波科技有限公司 | Agile frequency source |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104135280A (en) * | 2014-06-26 | 2014-11-05 | 西安空间无线电技术研究所 | Frequency source circuit with harmonic generation and frequency mixing |
| CN105356896A (en) * | 2015-09-29 | 2016-02-24 | 西安空间无线电技术研究所 | Multi-frequency switching system and method for miniature Ka double-frequency transmitter |
| JP2016144054A (en) * | 2015-02-03 | 2016-08-08 | 三菱電機株式会社 | Frequency synthesizer |
| CN110798210A (en) * | 2019-11-29 | 2020-02-14 | 深圳市鼎阳科技股份有限公司 | Frequency synthesizer |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104135280A (en) * | 2014-06-26 | 2014-11-05 | 西安空间无线电技术研究所 | Frequency source circuit with harmonic generation and frequency mixing |
| JP2016144054A (en) * | 2015-02-03 | 2016-08-08 | 三菱電機株式会社 | Frequency synthesizer |
| CN105356896A (en) * | 2015-09-29 | 2016-02-24 | 西安空间无线电技术研究所 | Multi-frequency switching system and method for miniature Ka double-frequency transmitter |
| CN110798210A (en) * | 2019-11-29 | 2020-02-14 | 深圳市鼎阳科技股份有限公司 | Frequency synthesizer |
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