CN111464181A - Radio frequency signal source - Google Patents

Radio frequency signal source Download PDF

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Publication number
CN111464181A
CN111464181A CN202010354585.2A CN202010354585A CN111464181A CN 111464181 A CN111464181 A CN 111464181A CN 202010354585 A CN202010354585 A CN 202010354585A CN 111464181 A CN111464181 A CN 111464181A
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frequency
signal
phase
digital phase
filter
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CN111464181B (en
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吴成才
王志宇
赵军
侯玉林
张明
王荷竹
赵晋娟
王银辉
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Beijing Aerospace Guangtong Technology Co ltd Branch
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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
    • 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

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 used for providing phase-locking reference signals, the controller is connected with the digital phase-locking module and used for configuring the digital phase-locking module so as to change the frequency of a first oscillation signal output by the digital phase-locking module, the sampling phase-locking module receives the first oscillation signal and performs frequency mixing with radio frequency signals generated by the sampling phase-locking module to generate intermediate frequency signals, and the sampling phase-locking module takes the intermediate frequency signals as feedback signals and compares the feedback signals with the phase-locking reference signals to perform phase locking on the radio frequency signals.

Description

Radio frequency signal source
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 applied 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 feedback control circuit is to compare the phases of a reference signal and an oscillation signal generated inside the phase-locked loop, and when the phase difference between the two changes, change the frequency of the oscillation signal generated by the controlled oscillator, so that the frequency and the phase of the oscillation signal (the output signal of the frequency source) generated by the controlled oscillator keep a certain relationship with the reference signal. The phase-locked loop includes a digital phase-locked loop and a sampling phase-locked loop. The active digital phase discriminator, the frequency divider and other devices adopted by the digital phase-locked loop have higher noise floor, and the near carrier frequency phase noise is poorer when the high-frequency output is carried out. The sampling phase-locked loop adopts the passive analog phase discriminator, avoids the noise floor of the frequency divider and greatly reduces the noise floor of the phase discriminator, and has wide application prospect in the occasions with high frequency and ultra-low 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 the sampling phase-locked loop 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 adjust the frequency of a radio frequency signal while realizing phase locking on the high frequency radio frequency signal.
The embodiment of the invention provides a radio frequency signal source, which comprises a controller, a crystal oscillator, a digital phase-locked module and a sampling phase-locked 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-locked module and is used for configuring the digital phase-locked module so as to change the frequency of the first oscillation signal output by the digital phase-locked 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 perform phase locking on the radio-frequency signal.
Furthermore, the digital phase-locked module comprises a digital phase detection unit, a first filter, a first voltage-controlled oscillator and a first power divider,
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 configured to divide an output signal of the first voltage-controlled oscillator into two first oscillation signals, wherein one first oscillation signal is input to the digital phase discrimination unit and is used as a feedback signal of the first voltage-controlled oscillator, and the other first oscillation signal is input to the sampling phase-locking module,
the controller is connected with the digital phase discrimination unit and is configured with the digital phase discrimination unit to change the frequency of the first oscillation signal.
Further, the digital phase detection unit comprises a first frequency divider, a second frequency divider and a digital phase detector,
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 connected with 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 dividing 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.
Furthermore, 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 frequency mixer and is mixed with the first oscillating signal to generate the intermediate-frequency signal,
and the intermediate frequency signal passes through the third filter and then is input into the sampling phase discriminator to be 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 radio frequency signal source provided by the invention comprises a digital phase-locked module and a sampling phase-locked module, wherein a feedback signal in the sampling phase-locked loop is a mixing 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, the frequency of the output signal of the digital phase-locked loop can be changed, the frequency of the mixing signal is further changed, and finally the frequency of the radio frequency signal output by the sampling phase-locked module is 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 an RF signal source in the embodiment;
FIG. 2 is a block diagram of a digital phase-locked module according to an embodiment;
FIG. 3 is a block diagram of the digital phase-locking unit in the embodiment;
FIG. 4 is a block diagram of the sampling phase-locking module according to the embodiment.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a block diagram of an overall structure of an rf signal source in an embodiment, and referring to fig. 1, the rf signal source includes a controller 1, a crystal oscillator 2, a digital phase-locked module 3, and a sampling phase-locked module 4.
The crystal oscillator 2 is connected with the digital phase-locked module 3 and the sampling phase-locked module 4 for providing a phase-locked reference signal. The controller 1 is connected with the digital phase-locked module 3, and the controller 1 is configured to configure the digital phase-locked module 3 to change the frequency of the first oscillation signal output by the digital phase-locked module 3. The sampling phase-locking module 4 receives the first oscillation signal and mixes the first oscillation signal with a radio frequency signal generated by the sampling phase-locking module 4 to generate an intermediate frequency signal, and the sampling phase-locking module 4 compares the intermediate frequency signal with a phase-locking reference signal as a feedback signal to perform phase locking on the radio frequency signal.
In this embodiment, the digital phase-locked module 3 is dynamically configured by the controller 1, for example, the controller 1 changes the frequency of a reference signal received by the digital phase-locked module 3 or changes the frequency of a feedback signal received by the digital phase-locked module 3, when the frequency of the reference signal or the frequency of the feedback signal changes, the phase difference between the reference signal and the feedback signal changes accordingly, and further the control signal of a controlled oscillator in the digital phase-locked module 3 changes, and the frequency of the output signal of the digital phase-locked module 3 changes accordingly.
In this embodiment, the radio frequency signal source includes two phase-locked modules, namely a digital phase-locked module 3 and a sampling phase-locked module 4, and the feedback signal in the sampling phase-locked module 4 is an intermediate frequency signal obtained by mixing a low-frequency signal generated by the digital phase-locked module 3 with a high-frequency signal generated by the sampling phase-locked module 4 itself, and when the frequency of the low-frequency signal changes, the frequency of the intermediate frequency signal also changes after the mixing, so that the phase difference between the reference signal and the feedback signal in the sampling phase-locked module 4 changes, and the frequency of the radio frequency signal generated by the sampling phase-locked module 4 also changes accordingly.
The radio frequency signal source provided by the embodiment comprises a digital phase-locked module 3 and a sampling phase-locked module 4, wherein a feedback signal in the sampling phase-locked loop is a mixing signal based on an output signal of the digital phase-locked loop, a controller is adopted to actively change a phase difference between a reference signal and the feedback signal in the digital phase-locked loop, the frequency of the output signal of the digital phase-locked loop can be changed, the frequency of the mixing 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, thereby effectively avoiding the problem that the phase locking cannot be carried out when the frequency difference between the reference signal and the feedback signal is too large.
Fig. 2 is a block diagram of a digital phase locking module in an embodiment, fig. 3 is a block diagram of a digital phase locking unit in an embodiment, and referring to fig. 2 and fig. 3, as a possible implementation, the digital phase locking module 3 includes a digital phase detection 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 detection unit 31, and an output signal of the digital phase detection 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 an output signal of the first voltage-controlled oscillator 33 into two first oscillation signals, where one first oscillation signal is input to the digital phase discrimination unit 31 and is used as a feedback signal of the first voltage-controlled oscillator 33, and the other first oscillation signal is input to the sampling phase-locked module 4.
The controller 1 is connected to the digital phase detection unit 31, and the digital phase detection unit 31 is configured to change the frequency of the first oscillation signal. Specifically, the digital phase detection unit 31 includes a first frequency divider 301, a second frequency divider 303 and a digital phase detector 302, the crystal oscillator 2 is connected to the digital phase detector 302 through the first frequency divider 301, the first power divider 34 is connected to the digital phase detector 302 through the second frequency divider 303, the digital phase detector 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.
Illustratively, the first frequency divider 301 and the second frequency divider 303 are both controllable frequency dividers, for example, CD4040, the controller 1 is a single chip microcomputer, and the single chip microcomputer may change the frequency division number of the frequency divider through an analog switch, or the single chip microcomputer changes the frequency division number of the frequency divider through a manner of directly configuring a register of the frequency divider.
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 divided equally into two first oscillation signals by the power divider.
Illustratively, when the digital phase detector 302 performs phase locking, the actually used reference signal is a crystal oscillator signal frequency-divided by the first frequency divider 301, the actually used feedback signal is an oscillation signal frequency-divided by the second frequency divider 303, the digital phase detector 302 compares the phase difference between the frequency-divided crystal oscillator signal and the frequency-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 frequency of the signal and the frequency of the signal generated by the crystal oscillator satisfy the following formula:
Figure BDA0002473045420000061
in the formula (f)iFrequency of the signal generated for the crystal oscillator, f1In order 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 formula, the first voltage controlled oscillator 33 generates the signal f after the controller 1 changes the values of R and N to change the stability1Of (c) is detected.
Fig. 4 is a block diagram of a structure of a sampling phase-locked module in an embodiment, and referring to fig. 4, as an implementation possibility, the sampling phase-locked 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 to the sampling phase detector 41, an output signal of the sampling phase detector 41 is input to the second voltage-controlled oscillator 43 through the second filter 42, the second power divider 44 is configured to divide the output signal of the second voltage-controlled oscillator 43 into two paths of signals, one path of signal is directly output as a radio frequency signal, the other path of signal is input to the mixer 45, and is mixed with the first oscillation signal to generate an intermediate frequency signal, and the intermediate frequency signal passes through the third filter 46 and then is input to the sampling phase detector 41, 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 paths of signals with different powers and the same frequency by a coupler, wherein one path of signal with larger power is used as the output signal of the radio frequency signal source, and the other path of signal with smaller 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 frequency of the intermediate frequency signal and the frequency of the signal generated by the crystal oscillator satisfy the following formula:
Figure BDA0002473045420000071
and the intermediate frequency signal can be represented by the following formula:
f2＝f1+fo
in the formula (f)oThe frequency f of the intermediate frequency signal can be obtained by combining the above formulas and is stable2Not following f1Is changed to a constant value when f is changed1When changed, f2And fiThe phase difference between the two changes, and the sampling phase discriminator 41 pairs f according to the change of the phase differenceoIs corrected so that the lock is properly lockedAfter phase stabilization, f2And fiAre in phase with each other, radio frequency signal foIs changed.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. 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, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (9)

1. A radio frequency signal source is characterized by comprising a controller, a crystal oscillator, a digital phase-locked module and a sampling phase-locked 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-locked module and is used for configuring the digital phase-locked module so as to change the frequency of the first oscillation signal output by the digital phase-locked 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 perform phase locking on the radio-frequency signal.
2. The RF signal source of claim 1, wherein the digital phase lock module includes a digital phase detection unit, a first filter, a first voltage controlled oscillator, and a first power divider,
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 configured to divide an output signal of the first voltage-controlled oscillator into two first oscillation signals, wherein one first oscillation signal is input to the digital phase discrimination unit and is used as a feedback signal of the first voltage-controlled oscillator, and the other first oscillation signal is input to the sampling phase-locking module,
the controller is connected with the digital phase discrimination unit and is configured with the digital phase discrimination unit to change the frequency of the first oscillation signal.
3. The radio frequency signal source of claim 2, wherein the digital phase detection unit includes a first frequency divider, a second frequency divider, and a digital phase detector,
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 connected with 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 dividing times of the first frequency divider and the second frequency divider.
4. The radio frequency signal source of claim 2, wherein the first filter is a loop filter.
5. The rf signal source of claim 2, wherein the first power divider is a power divider.
6. The RF signal source of claim 1, wherein the sampling phase-locked module includes a sampling phase detector, 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 frequency mixer and is mixed with the first oscillating signal to generate the intermediate-frequency signal,
and the intermediate frequency signal passes through the third filter and then is input into the sampling phase discriminator to be used as a feedback signal of the second voltage-controlled oscillator.
7. The radio frequency signal source of claim 6, wherein the second filter is a loop filter.
8. The radio frequency signal source of claim 6, wherein the second power divider is a coupler.
9. The radio frequency signal source of claim 6, wherein the third filter is a cavity filter.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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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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

Patent Citations (4)

* Cited by examiner, † Cited by third party
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
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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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