CN114553221A - Frequency source and method for generating the same - Google Patents
Frequency source and method for generating the same Download PDFInfo
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- 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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- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
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Abstract
The invention provides a frequency source and a method for generating the same, wherein the frequency source comprises: a signal source module generating a first signal and a second signal; the comb spectrum module receives a first signal and generates a comb spectrum signal according to the first signal; the phase-locked loop module receives the second signal and the comb spectrum signal, and generates a third signal through phase locking, frequency multiplication and frequency mixing; and the output module receives the third signal and generates a target signal through frequency division processing. In the phase-locked loop module, a second signal triggers to generate a voltage-controlled oscillation signal, the voltage-controlled oscillation signal is subjected to frequency multiplication processing, then subjected to down-conversion processing with a comb spectrum signal and fed back to a phase discriminator of the phase-locked loop module, and phase noise of an output target signal can be effectively reduced; through the structural design of combining the frequency multiplication in the phase-locked loop and the frequency division of the phase-locked loop external output module, the frequency range of the target signal is expanded under the condition of hardly deteriorating phase noise, and the frequency range can be adjusted along with the frequency multiplication coefficient and the frequency division coefficient, so that the application range is wide.
Description
Technical Field
The present invention relates to the field of electronic technology, and more particularly, to a frequency source and a method for generating the same.
Background
The frequency source is a basic signal source of an electronic system, and in modern electronic technology, the frequency source becomes a core component of the electronic system, and is widely applied to the fields of radar, communication, measurement and control, countermeasure, navigation and the like. With the development of modern electronic technology, the performance of electronic equipment is continuously improved, the functions are continuously increased, and meanwhile, higher requirements are put forward on various performances of frequency sources. The indexes of the frequency source mainly comprise: miniaturization, small stepping, high stability, ultra wide band, low phase noise, low stray, low power consumption, frequency agility, quick start and the like. However, these indexes have a mutual constraint relationship, and it is difficult to fully consider them. Meanwhile, the emphasis points required by each index of the frequency source in different application fields are also different, so that the frequency source is often designed to be combined with actual application scenes to perform selection and compromise on each index.
The frequency source synthesis schemes widely used at present can be mainly divided into two categories, namely direct frequency synthesis and indirect frequency synthesis. The frequency source directly synthesized synthesizes the required frequency points by frequency doubling (x), frequency mixing (+/-) or frequency division (div) and other methods for the reference signal, has the optimal near-end phase noise and high-speed frequency agility, but has the characteristics of complex structure and high cost, and limits that the frequency source can only be applied to the high-end application fields of radar and the like. The frequency source for indirect frequency synthesis is an automatic control closed-loop system with phase tracking (locking), and the frequency of an oscillator in the system is locked with a reference signal in phase, so that any required frequency point is indirectly synthesized, but the indirect synthesis frequency source has relatively poor noise and is not suitable for being directly used as an ultra-low phase noise source.
Therefore, a frequency source design scheme with simple structure and low phase noise is urgently needed.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a frequency source synthesis scheme, which is used to solve the technical problem that the conventional frequency source synthesis scheme cannot combine the features of simple structure and low phase noise.
To achieve the above and other related objects, the present invention provides the following technical solutions.
A frequency source, comprising:
a signal source module generating a first signal and a second signal;
the comb spectrum module receives the first signal and generates a comb spectrum signal according to the first signal;
the phase-locked loop module receives the second signal and the comb spectrum signal, and generates a third signal through phase locking, frequency multiplication and frequency mixing;
the output module receives the third signal and generates a target signal through frequency division processing;
in the phase-locked loop module, the second signal triggers generation of a voltage-controlled oscillation signal, and the voltage-controlled oscillation signal is subjected to frequency multiplication processing, then subjected to down-conversion processing with the comb spectrum signal and fed back to a phase discriminator of the phase-locked loop module.
Optionally, the signal source module includes:
a crystal oscillator for generating an initial signal;
and the power divider receives the initial signal and generates the first signal and the second signal according to the initial signal.
Optionally, the comb spectrum module comprises:
the comb spectrum generating unit is used for receiving the first signal and generating an initial comb spectrum signal according to the first signal;
the first amplifier is used for receiving the initial comb spectrum signal and amplifying the initial comb spectrum signal to obtain an intermediate comb spectrum signal;
and the segmented filtering unit comprises at least two filtering branches arranged in parallel and is used for carrying out segmented filtering selection processing on the middle comb spectrum signal to obtain the comb spectrum signal.
Optionally, the segmented filtering unit includes:
the input end of the first one-out-of-two switch is connected with the output end of the first amplifier;
a second one-out-of-two switch, the output end of which outputs the comb spectrum signal;
the input end of the first filter is connected with the first output end of the first one-of-two switch, and the output end of the first filter is connected with the first input end of the second one-of-two switch;
and the input end of the second filter is connected with the second output end of the first one-of-two switch, and the output end of the second filter is connected with the second input end of the second one-of-two switch.
Optionally, the phase-locked loop module includes a phase detector, a third filter, a voltage-controlled oscillator, a frequency multiplier, a fourth filter, a coupler, an attenuator, a second amplifier, a mixer, and a fifth filter, a reference input terminal of the phase detector is connected to the second signal, an output terminal of the phase detector is connected to an input terminal of the third filter, an output terminal of the third filter is connected to an input terminal of the voltage-controlled oscillator, an output terminal of the voltage-controlled oscillator is connected to an input terminal of the frequency multiplier, an output terminal of the frequency multiplier is connected to an input terminal of the fourth filter, an output terminal of the fourth filter is connected to an input terminal of the coupler, a coupling terminal of the coupler is connected to an input terminal of the attenuator, an output terminal of the attenuator is connected to an input terminal of the second amplifier, and an output terminal of the second amplifier is connected to a local oscillation input terminal of the mixer, the radio frequency input end of the frequency mixer is connected with the comb spectrum signal, the intermediate frequency output end of the frequency mixer is connected with the input end of the fifth filter, and the output end of the fifth filter is connected with the feedback input end of the phase discriminator.
Optionally, the output module includes a frequency divider and a third amplifier, an input of the frequency divider is connected to an output of the coupler, an output of the frequency divider is connected to an input of the third amplifier, and an output of the third amplifier outputs the target signal.
Optionally, the frequency multiplier comprises a variable frequency multiplier and the frequency divider comprises a variable frequency divider.
A method of generating a frequency source, comprising:
providing a first signal and a second signal;
generating a comb spectrum signal according to the first signal;
performing phase locking and frequency multiplication processing on the second signal through a phase-locked loop to obtain a third signal;
performing frequency division processing on the third signal to generate a target signal;
when the second signal is subjected to phase locking and frequency multiplication, the second signal triggers generation of a voltage-controlled oscillation signal, the voltage-controlled oscillation signal is subjected to frequency multiplication to obtain a third signal, and the third signal and the comb spectrum signal are subjected to down-conversion processing and then fed back to a phase discriminator of the phase-locked loop.
Optionally, the step of generating a comb spectrum signal according to the first signal comprises:
generating an initial comb spectrum signal according to the first signal;
amplifying the initial comb spectrum signal to obtain an intermediate comb spectrum signal;
and carrying out segmented filtering selection processing on the intermediate comb spectrum signal to obtain the comb spectrum signal.
Optionally, the frequency range of the target signal is adjusted by adjusting a frequency multiplication coefficient of the frequency multiplication process and a frequency division coefficient of the frequency division process.
As described above, the frequency source and the method for generating the same of the present invention have at least the following advantages:
in the phase-locked loop module, a second signal triggers to generate a voltage-controlled oscillation signal, the voltage-controlled oscillation signal is subjected to frequency multiplication processing, then subjected to down-conversion processing with a comb spectrum signal and fed back to a phase discriminator of the phase-locked loop module, and phase noise of an output target signal can be effectively reduced; through the structural design of combining the frequency multiplication in the phase-locked loop and the frequency division of the phase-locked loop external output module, the frequency range of the target signal is expanded under the condition of hardly deteriorating phase noise, and the frequency range can be adjusted along with the frequency multiplication coefficient and the frequency division coefficient, so that the application range is wide.
Drawings
Fig. 1 is a circuit configuration diagram showing a conventional frequency source synthesizing scheme.
Fig. 2 is a circuit configuration diagram showing another conventional frequency source synthesizing scheme.
Fig. 3 is a circuit configuration diagram of the frequency synthesizing unit in fig. 2.
Fig. 4 is a circuit configuration diagram of the frequency source of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Please refer to fig. 1 to 4. It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated. The structures, proportions, sizes, and other dimensions shown in the drawings and described in the specification are for understanding and reading the present disclosure, and are not intended to limit the scope of the present disclosure, which is defined in the claims, and are not essential to the art, and any structural modifications, changes in proportions, or adjustments in size, which do not affect the efficacy and attainment of the same are intended to fall within the scope of the present disclosure.
As described in the background section above, the inventors have found many deficiencies when studying existing frequency source synthesis schemes.
As shown in fig. 1, in the first conventional frequency source synthesis scheme, a direct frequency synthesis manner is adopted, a comb spectrum generator generates a comb spectrum signal, a power divider divides the comb spectrum signal into multiple paths, each path is subjected to filtering, switch selection and amplification, and finally multiple complex processing combining frequency doubling, frequency division and frequency mixing is performed to obtain a target signal. However, in principle, the scheme can generate various combined components and harmonic components to form unwanted stray signals, and filters the unwanted stray signals by using filters with considerable quantity, so that the overall size is large, and the more frequency points to be output, the larger the size is; meanwhile, a large number of filters are needed for filtering various unwanted spurious signals, and in order to adapt to frequency planning, the filters are often customized specially, so that the cost is high; in addition, in consideration of size and cost, generally, the output frequency point of the scheme cannot be too much, which results in narrow output bandwidth or small frequency step.
As shown in fig. 2-3, the second conventional frequency source combining scheme adopts a ping-pong structure, and uses a one-out-of-multiple switch to select one of the multiple frequency combining units for output, and each frequency combining unit is responsible for an output frequency of one frequency band. The frequency unit is internally provided with an improved indirect frequency synthesis mode, and the higher harmonic of the comb spectrum generator and the phase-locked loop are utilized to carry out frequency mixing outside the loop so as to reduce the value of the N frequency divider in the phase-locked loop, thereby minimizing the additional noise of the phase-locked loop and obtaining a target signal with low phase noise. However, by adopting the scheme, when the frequency range is large or the frequency range comprises multiple frequency bands, a plurality of frequency synthesis units are needed, and the corresponding volume is larger; meanwhile, the hardware cost is increased linearly by using a plurality of frequency synthesis units, the frequency synthesis units of different frequency bands have large discreteness, and the debugging cost is increased, so the overall cost is high; in addition, in most application scenarios, in order to ensure the frequency hopping time, the frequency synthesis unit not selected by the one-out-of-multiple switch cannot be powered off for standby, a plurality of frequency sources always work in a small space at the same time, and these signals can propagate on a line and also radiate in the space, which is difficult to isolate cleanly.
Based on this, the present invention proposes a frequency source synthesis scheme: the frequency range of the output target signal is expanded and adjusted by adopting an indirect synthesis mode based on a phase-locked loop and through the structural design of combining frequency multiplication in the phase-locked loop and frequency division outside the phase-locked loop, and the volume and the cost of the frequency range are reduced; the comb spectrum signal selected by the segmented filtering and the phase-locked loop are subjected to in-loop mixing to reduce the phase noise of the output target signal and reduce the dispersion of the frequency division coefficient of the frequency divider outside the phase-locked loop to the maximum extent.
In detail, as shown in fig. 4, the present invention provides a frequency source, which includes:
the signal source module generates a first signal V1 and a second signal V2;
the comb spectrum module receives the first signal V1 and generates a comb spectrum signal V01 according to the first signal V1;
the phase-locked loop module receives the second signal V2 and the comb spectrum signal V01, and generates a third signal V3 through phase locking, frequency multiplication and frequency mixing;
the output module receives the third signal V3 and generates a target signal V4 through frequency division processing;
in the phase-locked loop module, the second signal V2 triggers to generate a voltage-controlled oscillation signal V02, and the voltage-controlled oscillation signal V02 is frequency-multiplied, then down-converted with the comb spectrum signal V01, and fed back to the phase discriminator of the phase-locked loop module.
In more detail, as shown in fig. 4, the signal source module includes:
a crystal oscillator generating an initial signal V00;
the power divider receives the initial signal V00 and generates a first signal V1 and a second signal V2 according to the initial signal V00.
In more detail, as shown in fig. 4, the comb spectrum module includes:
a comb spectrum generation unit receiving the first signal V1 and generating an initial comb spectrum signal V11 according to the first signal V1;
the first amplifier receives the initial comb spectrum signal V11 and amplifies the initial comb spectrum signal V11 to obtain an intermediate comb spectrum signal V12;
and the segmented filtering unit comprises at least two filtering branches arranged in parallel and is used for carrying out segmented filtering selection processing on the middle comb spectrum signal V12 to obtain a comb spectrum signal V01.
In an optional embodiment of the present invention, the segmented filtering unit includes two filtering branches arranged in parallel, the two filtering branches have different filtering selection frequency range, and based on the two filtering branches, the filtering selection is performed on the intermediate comb spectrum signal V12 in the two frequency range, as shown in fig. 4, which specifically includes:
the input end of the first one-out-of-two switch is connected with the output end of the first amplifier;
a second one-of-two switch, the output end of which outputs a comb spectrum signal V01;
the input end of the first filter is connected with the first output end of the first one-of-two switch, and the output end of the first filter is connected with the first input end of the second one-of-two switch;
and the input end of the second filter is connected with the second output end of the first alternative switch, and the output end of the second filter is connected with the second input end of the second alternative switch.
In more detail, as shown in fig. 4, the phase-locked loop module includes a phase detector, a third filter, a voltage-controlled oscillator, a frequency multiplier, a fourth filter, a coupler, an attenuator, a second amplifier, a frequency mixer, and a fifth filter, a reference input of the phase detector is connected to a second signal V2, an output of the phase detector is connected to an input of the third filter, an output of the third filter is connected to an input of the voltage-controlled oscillator, an output of the voltage-controlled oscillator is connected to an input of the frequency multiplier, an output of the frequency multiplier is connected to an input of the fourth filter, an output of the fourth filter is connected to an input of the coupler, a coupling of the coupler is connected to an input of the attenuator, an output of the attenuator is connected to an input of the second amplifier, an output of the second amplifier is connected to a local oscillation input of the frequency mixer, a radio frequency input of the frequency mixer is connected to a comb-like spectrum signal V01, and an intermediate frequency output of the frequency mixer is connected to an input of the fifth filter, and the output end of the fifth filter is connected with the feedback input end of the phase detector.
In more detail, as shown in fig. 4, the output module includes a frequency divider and a third amplifier, an input terminal of the frequency divider is connected to an output terminal of the coupler, an output terminal of the frequency divider is connected to an input terminal of the third amplifier, and an output terminal of the third amplifier outputs the target signal V4.
The frequency multiplier comprises a variable frequency multiplier, and the frequency multiplication coefficient of the variable frequency multiplier is adjustable; the frequency divider comprises a variable frequency divider, the division factor of which is adjustable.
More specifically, as shown in fig. 4, the phase-locked loop formed by the phase detector and the voltage-controlled oscillator is used for phase locking, the locked voltage-controlled oscillation signal V02 is frequency-multiplied by a frequency multiplier (the frequency multiplication coefficient is M, M is any positive integer), and then enters the coupler, the frequency of the output signal of the main circuit of the coupler enters the frequency divider (the frequency division coefficient is N, N is any positive integer), and the frequency of the output signal of the frequency divider is FV02×M÷N，FV02The frequency of the voltage-controlled oscillating signal V02, which is the output frequency of the frequency source (the frequency of the target signal V4), is shown as the final output signal (the target signal V4) after the subsequent power adjustment and the harmonic filtering. Coupled path signal (frequency F) of couplerV02xM) is amplified by the second amplifier and then enters a local oscillation input port of the frequency mixer, and a comb spectrum signal (with the frequency of P x F) generated by the comb spectrum generation unit after being selected by switch filtering is input into a radio frequency input port of the frequency mixerREFP is any positive integer, FREFIs the reference frequency, i.e., the frequency of the first signal V1). The intermediate frequency signal output after passing through the mixer is passed through a fifth filter (low pass filter) to extract the lower sideband frequency Fs ═ FV02×M-P×FREFAnd enters the feedback end of the phase detector to form a closed loop.
Further, as shown in fig. 4, the frequency multiplier is implanted in the phase-locked loop, and the frequency divider is implanted outside the phase-locked loop, so that the bandwidth range is effectively expanded, and the pressure of the voltage-controlled oscillator is greatly reduced. In frequency planning, the highest frequency band can be used as a reference, the coefficient relationship of each frequency band is determined (can be adjusted or expanded properly), and then the numerical values of the frequency multiplication coefficient M of the frequency multiplier and the frequency division coefficient N of the frequency divider are determined, so that the required frequency band is completely covered. The invention can complete the expansion of the output frequency range without adding any oscillator, thereby realizing small volume, low cost and low power consumption. For example, in an optional embodiment of the present invention, to design a frequency source of the target signal V4 with a frequency range of 4.8G to 5.8G and 12G to 14G, only one voltage-controlled oscillator covering a frequency band of 12G to 14.5G is actually needed, and by setting M to 2 for frequency multiplication and then controlling a frequency division ratio N of a frequency divider to be 2 during frequency hopping, 12 to 14G ((12 to 14) × 2 ÷ 2) can be covered; the frequency division ratio N is controlled to 5, which can cover a frequency range of 4.8 to 5.8G ((12 to 14.5) × 2 ÷ 5), and similarly, N may be set to another integer to cover another frequency band.
Generally, the invention adopts an improved indirect frequency synthesis mode, and is realized by methods of in-loop frequency multiplication, frequency mixing and out-loop controllable frequency division, the voltage-controlled oscillation signal V02 is subjected to frequency multiplication and then subjected to down-conversion with a proper comb spectrum signal, so that the additional noise of components in the system can be minimized, a controllable frequency divider is inserted out-loop and acts together with the in-loop frequency multiplier, and the frequency coverage range can be effectively expanded; the comb spectrum signal is subjected to segmented filtering selection (the specific number of segments is comprehensively considered according to indexes such as module size, bandwidth and phase noise), so that the discreteness of the frequency division coefficient of the frequency divider outside the phase-locked loop can be reduced to the greatest extent, and the aim of low phase noise is better achieved; only one frequency synthesis unit (phase-locked loop) and one voltage-controlled oscillator are needed to work, the risk of spurious caused by other voltage-controlled oscillation signals is avoided, other internal frequency signal sources are avoided near an output frequency band, and the spurious performance is guaranteed to be better in design; when the frequency band is changed, active devices are hardly added, and only the frequency division coefficient N of the frequency divider is changed, so that the power consumption is lower; the main structure is only a comb spectrum module and a phase-locked loop module, and a micro-assembly process is adopted, so that the size is easy to reduce; by adopting a special stray isolation method, the good isolation between the local oscillator port of the frequency mixer and the radio frequency main circuit is formed by fully utilizing the port isolation degree of the frequency mixer, the reverse isolation degree of the amplifier, the attenuation value of the attenuator and the coupling degree of the coupler during scheme design, so that the excellent stray performance is achieved, any filter is prevented from being used on a branch circuit or a main circuit, and the size and the cost are saved.
In addition, based on the same design idea as the above frequency source circuit structure, the present invention further provides a method for generating a frequency source, which includes the steps of:
s1, providing a first signal and a second signal;
s2, generating a comb spectrum signal according to the first signal;
s3, performing phase locking and frequency multiplication processing on the second signal through a phase-locked loop to obtain a third signal;
s4, performing frequency division processing on the third signal to generate a target signal;
in step S3, when the second signal is phase-locked and frequency-multiplied, the second signal triggers to generate a voltage-controlled oscillation signal, the voltage-controlled oscillation signal is frequency-multiplied to obtain a third signal, and the third signal and the comb spectrum signal are down-converted and fed back to the phase discriminator of the phase-locked loop, so that the phase noise of the output target signal can be effectively reduced.
Optionally, the step S2 of generating the comb spectrum signal according to the first signal further includes:
s21, generating an initial comb spectrum signal according to the first signal;
s22, amplifying the initial comb spectrum signal to obtain an intermediate comb spectrum signal;
and S23, carrying out segmented filtering selection processing on the middle comb spectrum signal to obtain the comb spectrum signal.
In detail, in step S2, the comb spectrum signal is filtered in segments and selected (the specific number of segments is considered comprehensively according to the indexes such as module size, bandwidth and phase noise), and then is filtered in segments in a plurality of required frequency bands and then mixed, so that the discreteness of the frequency division coefficient of the external frequency divider of the phase-locked loop can be reduced to the greatest extent, and the phase noise of the target signal is further reduced.
Optionally, the method for generating the frequency source further comprises the steps of:
and S5, adjusting and expanding the frequency range of the target signal by adjusting the frequency multiplication coefficient of frequency multiplication and the frequency division coefficient of frequency division, thereby realizing the full coverage of the required frequency band and obtaining the target signal with multiple frequency bands, broadband and low phase noise.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A frequency source, comprising:
a signal source module generating a first signal and a second signal;
the comb spectrum module receives the first signal and generates a comb spectrum signal according to the first signal;
the phase-locked loop module receives the second signal and the comb spectrum signal, and generates a third signal through phase locking, frequency multiplication and frequency mixing processing;
the output module receives the third signal and generates a target signal through frequency division processing;
in the phase-locked loop module, the second signal triggers generation of a voltage-controlled oscillation signal, and the voltage-controlled oscillation signal is subjected to frequency multiplication, then subjected to down-conversion processing with the comb spectrum signal and fed back to a phase discriminator of the phase-locked loop module.
2. The frequency source of claim 1, wherein the signal source module comprises:
a crystal oscillator for generating an initial signal;
and the power divider receives the initial signal and generates the first signal and the second signal according to the initial signal.
3. The frequency source of claim 2, wherein the comb spectrum module comprises:
the comb spectrum generating unit is used for receiving the first signal and generating an initial comb spectrum signal according to the first signal;
the first amplifier is used for receiving the initial comb spectrum signal and amplifying the initial comb spectrum signal to obtain an intermediate comb spectrum signal;
and the segmented filtering unit comprises at least two filtering branches arranged in parallel and is used for carrying out segmented filtering selection processing on the middle comb spectrum signal to obtain the comb spectrum signal.
4. The frequency source of claim 3, wherein the segmented filtering unit comprises:
the input end of the first one-out-of-two switch is connected with the output end of the first amplifier;
a second one-out-of-two switch, the output end of which outputs the comb spectrum signal;
a first filter, the input end of which is connected with the first output end of the first alternative switch, and the output end of which is connected with the first input end of the second alternative switch;
and the input end of the second filter is connected with the second output end of the first one-of-two switch, and the output end of the second filter is connected with the second input end of the second one-of-two switch.
5. The frequency source according to claim 4, wherein the phase-locked loop module comprises a phase detector, a third filter, a voltage-controlled oscillator, a frequency multiplier, a fourth filter, a coupler, an attenuator, a second amplifier, a mixer, and a fifth filter, a reference input of the phase detector is connected to the second signal, an output of the phase detector is connected to an input of the third filter, an output of the third filter is connected to an input of the voltage-controlled oscillator, an output of the voltage-controlled oscillator is connected to an input of the frequency multiplier, an output of the frequency multiplier is connected to an input of the fourth filter, an output of the fourth filter is connected to an input of the coupler, a coupling of the coupler is connected to an input of the attenuator, an output of the attenuator is connected to an input of the second amplifier, and an output of the second amplifier is connected to a local oscillator input of the mixer, the radio frequency input end of the frequency mixer is connected with the comb spectrum signal, the intermediate frequency output end of the frequency mixer is connected with the input end of the fifth filter, and the output end of the fifth filter is connected with the feedback input end of the phase discriminator.
6. The frequency source of claim 5, wherein the output module comprises a frequency divider and a third amplifier, wherein an input of the frequency divider is connected to an output of the coupler, an output of the frequency divider is connected to an input of the third amplifier, and an output of the third amplifier outputs the target signal.
7. The frequency source of claim 6, wherein the frequency multiplier comprises a variable frequency multiplier and the frequency divider comprises a variable frequency divider.
8. A method of generating a frequency source, comprising:
providing a first signal and a second signal;
generating a comb spectrum signal according to the first signal;
performing phase locking and frequency multiplication processing on the second signal through a phase-locked loop to obtain a third signal;
performing frequency division processing on the third signal to generate a target signal;
when the second signal is subjected to phase locking and frequency multiplication, the second signal triggers generation of a voltage-controlled oscillation signal, the voltage-controlled oscillation signal is subjected to frequency multiplication to obtain a third signal, and the third signal and the comb spectrum signal are subjected to down-conversion processing and then fed back to a phase discriminator of the phase-locked loop.
9. The method for generating a frequency source according to claim 8, wherein the step of generating a comb spectrum signal according to the first signal comprises:
generating an initial comb spectrum signal according to the first signal;
amplifying the initial comb spectrum signal to obtain an intermediate comb spectrum signal;
and carrying out segmented filtering selection processing on the intermediate comb spectrum signal to obtain the comb spectrum signal.
10. The method according to claim 9, wherein the frequency range of the target signal is adjusted by adjusting a multiplication factor of a frequency multiplication process and a division factor of a frequency division process.
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| CN115842549A (en) * | 2023-02-15 | 2023-03-24 | 成都天锐星通科技有限公司 | Frequency synthesizer |
| CN115842549B (en) * | 2023-02-15 | 2023-05-09 | 成都天锐星通科技有限公司 | Frequency synthesizer |
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