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CN116865680A - Small high-purity frequency spectrum broadband reconfigurable frequency synthesis circuit, device and method - Google Patents

Small high-purity frequency spectrum broadband reconfigurable frequency synthesis circuit, device and method Download PDF

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Publication number
CN116865680A
CN116865680A CN202311126880.2A CN202311126880A CN116865680A CN 116865680 A CN116865680 A CN 116865680A CN 202311126880 A CN202311126880 A CN 202311126880A CN 116865680 A CN116865680 A CN 116865680A
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frequency
intermediate frequency
signal
circuit
unit
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CN116865680B (en
Inventor
赵翔
张文锋
陈昌锐
刘武广
王燕
谢翔宇
苏梦蜀
陈睿
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CETC 29 Research Institute
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CETC 29 Research Institute
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
    • H03D7/16—Multiple-frequency-changing
    • H03D7/165—Multiple-frequency-changing at least two frequency changers being located in different paths, e.g. in two paths with carriers in quadrature
    • 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
    • H03L7/22—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using more than one loop
    • H03L7/23—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using more than one loop with pulse counters or frequency dividers
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

The invention discloses a small high-purity frequency spectrum broadband reconfigurable frequency synthesis circuit, a device and a method, which belong to the technical field of frequency synthesis and comprise a radio frequency circuit, a power supply circuit and a control circuit, wherein the control circuit is respectively connected with the radio frequency circuit and the power supply circuit; the radio frequency circuit adopts a direct combination to build a low-phase noise frame, mixes a whole-section mobile spread spectrum, and utilizes the characteristic that the power of a high-order signal of the mixer varies with the input power of an intermediate frequency in order multiple to weaken the stray influence of high-order intermodulation; the radio frequency circuit utilizes a double-numerical control attenuator to realize the dynamic adjustment of the working point of the mixer and the link gain; the power supply circuit is grounded through matching of multipath independent power supply and single-point filtering, under the condition of simplifying a frequency mixing filtering scheme, separation of signal chains is guaranteed, high spurious suppression is achieved, and the power supply circuit is used for power supply and separation between functional signal chains. The invention realizes the synthesis of small-sized, high-purity frequency spectrum and broadband reconfigurable frequency.

Description

Small high-purity frequency spectrum broadband reconfigurable frequency synthesis circuit, device and method
Technical Field
The invention relates to the technical field of frequency synthesis, in particular to a small high-purity frequency spectrum broadband reconfigurable frequency synthesis circuit, device and method.
Background
The frequency synthesis technology can provide local oscillation and clock for the system and is widely applied to modern electronic information systems such as communication, radar, interference and the like. Along with the technical progress of semiconductors and the like, the development of various systems presents multifunctional, integrated and miniaturized trends, and on the basis of the traditional performance requirements of low-phase noise and low-stray high-purity frequency spectrums, the multifunctional requirements of miniaturization, broadband fine stepping, rapid switching and the like are met, and new challenges are brought to the frequency synthesis technology.
The frequency synthesis technique includes a direct digital frequency synthesis technique, an indirect frequency synthesis technique, and a direct frequency synthesis technique. The direct digital frequency synthesis adopts a register to match with DA, can realize fine stepping output, but is limited by the highest clock frequency of a digital device, has low output frequency and narrow bandwidth, and has large device size and difficult circuit miniaturization. The indirect frequency synthesis technology adopts a phase discriminator, a loop filter and a voltage-controlled oscillator to form a phase-locked loop, and adjusts the configuration of the phase discriminator through the code sending of an upper computer to realize dynamic locking of the loop and output the required frequency, and has the advantages of wide output frequency, simple scheme, easy realization and the like, but is limited by the noise bottom of the phase discriminator, and the phase noise is difficult to promote. The direct frequency synthesis realizes the operations of adding, subtracting, multiplying and dividing the signal frequency through mixing, multiplying and dividing the reference input, has no noise of additional digital devices, and has the advantage of low phase noise compared with other synthesis schemes. However, the process of generating the required frequency points by the traditional direct-combination circuit can generate a large amount of spurious signals, the more the frequency points are filtered by adopting a filter, the wider the coverage bandwidth is, the more the number of the filters is, and the more complex the realization circuit is. Therefore, it is difficult to compromise broadband, fine stepping, low spurious index requirements in small volumes.
Typical reports are as follows:
in 2016, roming et al published papers on design implementation of a small millimeter wave broadband frequency source. According to the scheme, a phase discriminator is matched with a broadband VCO to realize a phase-locked loop circuit of 11 GHz-20 GHz, the frequency spectrum is spread to 22 GHz-40 GHz through frequency doubling, and baseband and higher harmonic spurious emissions are filtered through switch filtering. The scheme is easy to realize and covers the frequency bandwidth. But is limited by the phase detector noise floor, phase noise is difficult to improve, and is influenced by the frequency division spurious of the phase detector, so spurious suppression is difficult to promote. In addition, the output signal is generated by baseband doubling, and the output phase noise and spurs are further deteriorated by 6dB by 20lgN (n=2) than the phase-locked baseband.
In 2022, zhao Xiang et al patent application license ZL 2022 1 0046614.8, a wideband fine stepping frequency synthesis circuit, the proposal adopts a comb line to generate low phase noise local oscillation, adopts a DDS to cooperate with a phase-locked loop to generate a wideband fine stepping intermediate frequency signal, and realizes wideband output through mixing, moving and splicing. The scheme gives consideration to the requirements of low phase noise and broadband fine stepping performance, but the mixing frequency generates a large amount of intermodulation spurs, and a plurality of groups of subdivision band-pass filters are needed to be adopted for filtering one by one. The number of filter segments is positively correlated with the final combining circuit spurious performance, the more filter segments, the higher intermodulation spurious suppression, but the larger the combining volume. Meanwhile, the scheme adopts a phase-locked loop to realize fine stepping, and can not meet the requirements of partial systems on fast switching application of frequency sources, and the function is limited.
In 2022, zhang Wenfeng et al patent application ZL 2022 1 0046668.4, "a broadband fast switching frequency synthesis circuit", in which a comb line is used to generate low-phase noise local oscillation and intermediate frequency signals, and frequency spectrum expansion is realized by mixing and shifting. After mixing, filtering by subdividing the output frequency band to realize spurious filtering. After the scheme mixes, the mixed local oscillation and the high-order spurious signals are filtered through the filtering segmentation, and the higher the spurious suppression requirement is, the finer the mixed filtering segmentation is, and the larger the space occupation is. And the local oscillation large signal is easy to form crosstalk to intermediate frequency and mixing output from a power end, and the spurious suppression is difficult to process, and can be optimized only by continuously subdividing filtering segments and increasing the cascading order of the filter. It is difficult to achieve both high spurious suppression and miniaturization.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a small-sized high-purity frequency spectrum broadband reconfigurable frequency synthesis circuit, a device and a method, which realize the synthesis of small-sized high-purity frequency spectrum broadband reconfigurable frequency.
The invention aims at realizing the following scheme:
the small high-purity frequency spectrum broadband reconfigurable frequency synthesis circuit comprises a radio frequency circuit, a power supply circuit and a control circuit, wherein the control circuit is respectively connected with the radio frequency circuit and the power supply circuit;
The radio frequency circuit adopts a direct combination construction low-phase noise frame, and mixes with an intermediate frequency signal with a set bandwidth in a time-sharing way by utilizing a multi-point local oscillator; the method comprises the steps that the influence of high-order intermodulation spurs is weakened by utilizing the characteristic that the power of a high-order signal of a mixer varies with the input power of an intermediate frequency in multiple orders, the tail end of the intermediate frequency signal is output by adopting a variable frequency divider, in-band power fluctuation of the intermediate frequency signal is reduced by utilizing the characteristic that the output power of the frequency divider is stable under the input condition of a wide power window, the working point of a post-stage mixer is solidified, and meanwhile, the spurs in the intermediate frequency band are further optimized by utilizing the frequency divider; an adjustable numerical control attenuator is adopted before and after mixing, and the working point of the mixer is adjusted in cooperation with linkage, so that the optimal spurious working point is selected under the condition of determining the link gain; the power supply circuit is grounded through matching of multipath independent power supply and single-point filtering, and is used for guaranteeing separation of signal chains and achieving high spurious suppression under the condition of simplifying a frequency mixing filtering scheme. In the scheme, the comb line generator directly generates high-frequency multi-point local oscillation signals, compared with a phase locking technology, no additional noise is generated on digital devices, and a low-phase noise common frame is built.
Further, the radio frequency circuit comprises a reference unit, a local oscillator unit, an intermediate frequency unit and a spread spectrum unit, wherein the intermediate frequency unit comprises an intermediate frequency unit 1 and/or an intermediate frequency unit 2; when the intermediate frequency unit comprises an intermediate frequency unit 1 and an intermediate frequency unit 2, the intermediate frequency units 1 and 2 respectively generate intermediate frequency signals Intermediate frequency signal->After one of the spread spectrum units is selected, the frequency synthesized output is generated by mixing with the local oscillation signal generated by the local oscillation unit; when the intermediate frequency unit comprises the intermediate frequency unit 1 or the intermediate frequency unit 2, the output signals of the intermediate frequency unit 1 and the intermediate frequency unit 2 are consistent, the port definition is consistent, the interchange can be realized, and the configuration can be selected according to the function requirement.
Further, the power supply circuit comprises a plurality of linear voltage stabilizing circuits, and the same power supply input is adoptedThe input power return line is commonly connected with the rack;The linear voltage stabilizing circuit 1, the linear voltage stabilizing circuit 2, the linear voltage stabilizing circuit 3 and the linear voltage stabilizing circuit 4 are connected; wherein the linear voltage stabilizing circuit 1 generates an output voltage +.>And loop->The method comprises the steps of carrying out a first treatment on the surface of the The linear voltage stabilizing circuit 2 generates an output voltage +>And loop->The method comprises the steps of carrying out a first treatment on the surface of the The linear voltage stabilizing circuit 3 generates an output voltage +>And loop->The method comprises the steps of carrying out a first treatment on the surface of the The linear voltage stabilizing circuit 4 generates an output voltage +>And loop->；、、And->Respectively and independently cut off, and respectively supply power to the reference unit, the local oscillator unit, the spread spectrum unit, the intermediate frequency unit 1 and the intermediate frequency unit 2 in sequence, and the frequency is +.>、、、Is commonly connected with the rack through L1, L2, L3 and L4 respectively; l1 is connected with one end->One end of the device is connected with the public ground of the rack and is nearest to the public ground of the rack; l2 one end is connected with- >One end is connected with the public ground of the rack, and the grounding point is far away from L1; l3 one end is connected with->One end is connected with the public ground of the rack, and the grounding point is far away from L2; l4 is connected with one end->One end of the device is connected with a public ground of the frame, and the grounding point is farthest;
the inductor L1 is used for suppressing the frequency of each signal in the link of the reference unit and the local oscillator unit; the inductor L2 is used for inhibiting the frequency of each signal in the spread spectrum unit link; the inductor L3 is used for suppressing the frequency of each signal in the link of the intermediate frequency unit 1; the inductor L4 is used for suppressing the frequency of each signal in the link of the intermediate frequency unit 2;、along with external power supply->Synchronous work (S)/(S)>、And the second one is conducted according to application requirements, and the time-sharing work is performed.
Further, the reference unit comprises a reference generation circuit and a reference power divider, and the reference generation circuit generates a reference signalThe power division is carried out by a reference power divider, and then the power division is respectively output to an intermediate frequency unit 1, an intermediate frequency unit 2 and a local oscillation unit.
Further, the intermediate frequency unit 1 includes a phase-locked circuit 1, a phase-locked circuit 2 and a variable P-divider, the phase-locked circuit 1 inputs a reference signalGenerating a fine stepped intermediate signal as a reference input to the phase-lock circuit 2, the phase-lock circuit 2 generating the signal +_ in integer mode>，Inputting to a variable P frequency divider, and processing by the variable P frequency divider to obtain an intermediate frequency signal +. >The variable P divider includes a variable divider whose division ratio starts from dividing by 1. Alternatively, the phase-locked loop 2 may directly generate the intermediate frequency signalThe P divider is divide by 1. Alternatively, the phase-locked loop 2 may generate the intermediate frequency signal frequency +.>P times of (i.e.)>。
Further, the intermediate frequency unit 2 comprises a low-phase noise reference point source 1, a comb line generator 1, a switch 1,A plurality of bandpass filters, a switch 2, an M frequency divider, the plurality of bandpass filters comprising bandpass filters +.>~The method comprises the steps of carrying out a first treatment on the surface of the Reference point source 1 inputs reference signal +.>The generated reference point frequency signal +.>Generating a wideband comb signal via a comb line generator 1, the comb signal being gated to +.>~One of the filters is filtered to remove the adjacent +.>Far-end comb line spectrumThen, the cascade is gated by a switch 2 to the M frequency divider; the M frequency divider divides the M frequency of the signal of the switch filtering gating to generate an intermediate frequency signal +.>。
Further, the output frequency range of the intermediate frequency unit 2 is~Adjacent band pass filter~The frequency difference is the same, i.e.)>、、~Is an arithmetic series; the output frequency range of the intermediate frequency unit 1 is consistent with that of the intermediate frequency unit 2, the same bandwidth is covered, and the output frequency range is set as +.>For the intermediate frequency unit 1, the output frequency range of the phase-locked circuit 2 needs to be coveredThe method comprises the steps of carrying out a first treatment on the surface of the For intermediate frequency unit 2, " >=，=。
Further, the implementation process paths of the intermediate frequency unit 1 and the intermediate frequency unit 2 are consistent, including but not limited to hybrid integration, QFN packaging, BGA packaging and the like; the intermediate frequency unit 1 and the intermediate frequency unit 2 have the same appearance, the same power supply, control and radio frequency interface, the same mounting mode and the same hole site, and the in-situ exchange can be realized.
Further, the local oscillation unit comprises a low-phase noise reference point source 2, a comb line generator 2, a switch 3 and a plurality of band-pass filters~The switch 4 and the N frequency multiplier, said plurality of band pass filters comprising a band pass filter +.>~The method comprises the steps of carrying out a first treatment on the surface of the Reference signal is input to a reference point frequency source>Output reference signal ∈ ->. The comb generator 2 generates a step +.>Is gated to +.>~One of the filters is filtered to remove the adjacent +.>And after far-end combing line spectrum, bySwitch 4 gating signal->The switch 4 is cascaded to the N frequency multiplier; n frequency multiplier +.>Frequency multiplication to generate local oscillation signal->、…、I.e. +.>、、…、Is an arithmetic series.
Further, the spreading unit comprises a switch 5, a digital control attenuator 1, a mixer, a switch 6 and a band-pass filter~A switch 7, a digital controlled attenuator 2 and a variable L frequency divider; intermediate frequency signal- >And intermediate frequency signal->The switch 5 is input, and the switch 5 is matched with the linear voltage stabilizing circuit 3 and the linear voltage stabilizing circuit 4 to alternately strobe the intermediate frequency signal to the numerical control attenuator 1; the digital control attenuator 1 adjusts the power of the intermediate frequency signal to be input into the mixer, and adds attenuation +.>The method comprises the steps of carrying out a first treatment on the surface of the Local oscillator driven mixer and channelMixing of the power-adjusted intermediate frequency signal to generate a radio frequency output signal>The method comprises the steps of carrying out a first treatment on the surface of the The RF output signal is input into a switch 6, and the multiple paths of RF output signals are conducted to a band-pass filter>~The switch 7 gates the filtered signal; the output of the switch 7 is connected with the numerical control attenuator 2, and the numerical control attenuator 2 adds attenuation to the mixed output power>The digital control attenuator 2 is cascaded with a variable L-frequency divider, the variable L-frequency divider output being the frequency synthesizing circuit output. The variable L frequency divider has a frequency division ratio of 1, 2, < >>、…. Mixing output signal +.>The coverage spans a single octave, in conjunction with a variable L divider, spreads the spectrum down, covering the (l+1) octave output. Further, the control circuit comprises an upper computer and a peripheral circuit thereof, wherein the upper computer inputs a function and a frequency control code, synchronously decodes the function and the frequency control code into a plurality of groups of control signals, and respectively controls the phase-locked circuit 1, the phase-locked circuit 2, the linear voltage stabilizing circuit 1-the linear voltage stabilizing circuit 4, the P frequency divider, the N frequency multiplier, the M frequency divider, the L frequency divider, the switch 1-the switch 7, the numerical control attenuator 1 and the numerical control attenuator 2; for a single output signal frequency, the frequency control codes are linked.
A compact high purity spectral wideband reconfigurable frequency synthesis apparatus comprising a compact high purity spectral wideband reconfigurable frequency synthesis circuit as claimed in any one of the preceding claims.
A method of small high purity spectral wideband reconfigurable frequency synthesis based on a small high purity spectral wideband reconfigurable frequency synthesis circuit as claimed in any preceding claim, and comprising the steps of:
in the spread spectrum unit, a control switch 5 is linked with a linear voltage stabilizing circuit 3 and a linear voltage stabilizing circuit 4, when the switch 5 gates an intermediate frequency signal IF1, the linear voltage stabilizing circuit 3 works, the intermediate frequency unit 1 works, the linear voltage stabilizing circuit 4 is turned off, and the intermediate frequency unit 2 is powered off;
when the control switch 5 gates the intermediate frequency signal IF2, the linear voltage stabilizing circuit 4 works, the intermediate frequency unit 2 works, the linear voltage stabilizing circuit 3 is turned off, and the intermediate frequency unit 1 is powered off; the linear voltage stabilizing circuit 3 and the linear voltage stabilizing circuit 4 are controlled to realize double-cut-off and double-isolation of radio frequency and power supply by matching with the switch 5, and intermediate frequency signals are improvedIntermediate frequency signal->Isolation between the two.
A method for synthesizing a small-sized high-purity spectrum broadband reconfigurable frequency, which is implemented based on the small-sized high-purity spectrum broadband reconfigurable frequency synthesizing circuit, and in the spread spectrum unit, comprises the following operation steps:
Input intermediate frequency signal is time-division multiplexed and is combined with multipoint local oscillatorMixing to produce +.>Wherein +.>、、…、J point local oscillators are used for realizing 2*j sections of mixing output;
selecting switch filtering segments after mixing~The method is only used for filtering local oscillator leakage generated by mixing, and high-order intermodulation spurs generated by mixing are suppressed and optimized by adopting a mode of adjusting the working point of the mixer.
The method for synthesizing the small high-purity frequency spectrum broadband reconfigurable frequency is realized based on the small high-purity frequency spectrum broadband reconfigurable frequency synthesizing circuit, and in the spread spectrum unit, the numerical control attenuator 1, the mixer and the numerical control attenuator 2 form an output signal power and mixing intermodulation suppression dynamic adaptation circuit to adjust each frequency output signal, and specifically comprises the following steps:
the numerical control attenuator 1 and the numerical control attenuator 2 are controlled to be linked, and the attenuation amounts of the numerical control attenuator 1 and the numerical control attenuator 2 are functions of frequency under different working states, and are set asAnd->Both have an initial amount of attenuation;
for single output frequency, detecting the mixed intermodulation spurious suppression of the synthesized signal at an output end, and if the design requirement is met, adjusting the numerical control attenuator 1 and the numerical control attenuator 2 of the frequency is not needed; if the design requirement is not satisfied, the spurious suppression of the faithful measurement mixing intermodulation spurious suppression is higher than the required spurious suppression difference Then the digital control attenuator 1 is adjusted, the attenuation is increased +.>After the power of the intermediate frequency signal is reduced, the power of the mixed output main signal is reduced +>The mixed high-order intermodulation signal is more dominantThe intermediate frequency order difference of the signals is more than or equal to 1, and the main signal can inhibit and improve the mixing intermodulation spurious signals more than or equal to +.>The method comprises the steps of carrying out a first treatment on the surface of the Synchronously adjusting the numerical control attenuator 2, the attenuation is reduced +.>The output signal power is kept constant.
A method of small high purity spectral wideband reconfigurable frequency synthesis based on a small high purity spectral wideband reconfigurable frequency synthesis circuit as claimed in any preceding claim, and comprising the steps of:
in the implementation process of the circuit, an intermediate frequency unit 1 and an intermediate frequency unit 2 are assembled at the same time, and the function switching is realized through the double switching of a power supply and a radio frequency; or in the circuit implementation process, only the intermediate frequency unit 1 or the intermediate frequency unit 2 is assembled, and the function reconstruction of the frequency synthesis circuit is realized by replacing the intermediate frequency function unit module so as to meet different system requirements, and meanwhile, the realization space is reduced.
The beneficial effects of the invention include:
the scheme of the embodiment of the invention adopts the comb line generator to directly generate high-frequency multi-point local oscillation signals, compared with the phase locking technology, no additional noise of digital devices is generated, and a shared low-phase noise frame is built; the intermediate frequency unit with consistent interfaces and independent functions is matched with an independent power supply to realize function reconstruction; realizing broadband splicing output by adopting time-sharing frequency mixing; the characteristic that the high-order output power of the mixer changes according to the order along with the intermediate frequency input power is utilized, and the design of a single-point grounded radio frequency link power supply loop is matched, so that the switch filtering design is simplified; reducing the fluctuation of the output power of the intermediate frequency signal by utilizing the characteristic of a wide input power window of the frequency divider, and solidifying the working point of the frequency mixer; and adjusting the working point of the mixer by using a double-numerical control attenuator, and dynamically optimizing the spurious suppression of the output signal. By using the method of the invention, the low phase noise and high spurious suppression broadband reconfigurable frequency synthesis is realized under a small volume. Specifically, the method has the following advantages:
(1) The embodiment of the invention realizes the segmentation simplification of the output filtering of the mixer, only filters local oscillation leakage, simplifies the segmentation design of the switch filtering, and reduces the realization volume, wherein the segmentation number j= 2*k (local oscillation frequency).
(2) According to the power supply circuit provided by the embodiment of the invention, the multipath independent power supply is matched with the single-point filtering grounding, so that the separation of each signal chain is ensured under the condition of simplifying a frequency mixing filtering scheme, and the high spurious suppression is realized. The innovative frequency mixing filtering scheme in the advantage (1) needs to reduce intermediate frequency and frequency mixing output power, so that the power difference of a local oscillator chain relative to the intermediate frequency and frequency mixing signal chain is large, and the novel problem of crosstalk of signals from a power supply and a power supply ground is easily caused. In order to improve the isolation of multiple paths of signals, independent power supplies are adopted for the intermediate frequency link and the local oscillation link, and inductors with inhibition effects on the corresponding signal frequencies in the intermediate frequency link and the local oscillation link are respectively connected to a rack common ground. The local oscillator link power ground return is closer to the chassis common ground than the intermediate frequency link power ground return. Through the design of the scheme, the signal grounding loop direction is solidified, the crosstalk of the high-power local oscillation link to the low-power intermediate frequency link is reduced, and the isolation degree is improved.
(3) The embodiment of the invention contemplates double numerical control attenuation before and after mixing, and can realize dynamic adjustment of the working point of the mixer and the link gain. The innovative frequency mixing filtering scheme in the advantage (1) adopts a mode of reducing intermediate frequency power to improve frequency mixing high-order intermodulation spurs, but an intermediate frequency signal has a certain bandwidth, and in order to realize targeted optimization of single-point frequency, power needs to be respectively adjusted for different frequency points, and a numerical control attenuator 1 is added at the front stage of the frequency mixer. The intermediate frequency signal is reduced to cause a new problem of reducing the mixing output power in a constant amplitude, so the invention adds the numerical control attenuator 2 at the later stage. The total attenuation amount of the numerical control attenuators 1 and 2 is kept constant, and the final output signal power is stable.
(4) According to the scheme provided by the embodiment of the invention, the variable frequency division is adopted for the final output of the intermediate frequency, so that the power of the intermediate frequency signal can be shaped, and the in-band spurious of the intermediate frequency signal can be reduced by the mode of obtaining the intermediate frequency signal by frequency-dividing the output frequency of the phase-locked loop 2. The frequency divider is characterized by having a wide input power window and stable output power. By utilizing the characteristics, the power fluctuation of the intermediate frequency signal is reduced. The frequency division can be optimized for spurious emissions by 20lgP (dB), the output frequency of the phase-locked circuit 2 is improved, and then the spurious emissions in the intermediate frequency signal band are optimized in a mode of frequency division to the required intermediate frequency. The switch filtering design is simplified, thereby achieving high spurious suppression in small volumes.
(5) In the embodiment of the invention, the comb wires are adopted to generate the multi-point high-frequency low-phase noise local oscillation signals, so that the phase-locked loop is avoided, the noise bottom of a digital device is avoided, the common low-phase noise frame is built, and the high performance is ensured. Intermediate frequency units with the same interface can be interchanged in situ, so that the function is reconfigurable. The output signals of the intermediate frequency unit 1 and the intermediate frequency unit 2 are consistent, the port definition is consistent, the interchange can be realized, and the configuration can be selected according to the function requirement.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic diagram of a radio frequency circuit of a small-sized high-purity spectrum broadband reconfigurable frequency synthesis circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a power supply circuit of a small-sized high-purity spectrum broadband reconfigurable frequency synthesis circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a control circuit of a small-sized high-purity spectrum broadband reconfigurable frequency synthesis circuit according to an embodiment of the present invention.
Detailed Description
All of the features disclosed in all of the embodiments of this specification, or all of the steps in any method or process disclosed implicitly, except for the mutually exclusive features and/or steps, may be combined and/or expanded and substituted in any way.
In view of the present situation and the problems existing in the background, the present inventors have conducted continuous thinking and studies to find that:
the output frequency bandwidth of the frequency synthesis circuit determines the working frequency range of the system, the phase noise influences the system dynamics, and the spurious suppression influences the system sensitivity. The common basic requirement of various systems on a frequency synthesis circuit is to realize the synthesis of a high-purity frequency spectrum signal with broadband, low phase noise and low spurious under a small volume. The difference requirement is that part of the frequency synthesis circuits are required to realize fine stepping scanning due to different application scenes, and the rapid switching requirement is not met at the moment; part of the required frequency synthesis circuits have fast switching capability, and no fine stepping is required.
At present, the existing scheme is difficult to meet the commonality and individuality requirements of the system application on the frequency synthesis circuit.
1. The miniaturization and the broadband high-purity spectrum performance requirements are difficult to be compatible: high purity spectrum refers to low phase noise and low spurious emissions. Indirect frequency synthesis is limited by the phase detector noise floor, which makes low phase noise difficult to achieve. The direct frequency synthesis does not use a phase discriminator, has no digital noise bottom influence, and can be used for realizing low-phase noise frequency synthesis. But direct frequency synthesis implements signal addition, subtraction, multiplication and operation, and generates a large amount of spurious signals in addition to the required frequency. The higher the spurious suppression requirement, the wider the bandwidth, the finer the switch filtering segments, the more segments, the larger the occupied space, and the harder the miniaturization. In addition, spurious signals generated by the direct frequency synthesis link are easy to form crosstalk from power supply, are difficult to filter, and the smaller the size is, the more troublesome the spurious problem is. Miniaturization is difficult to be compatible with broadband high purity spectrum.
2. Miniaturization is difficult to be compatible with the multifunctional requirements: based on the high-purity frequency spectrum performance requirement of low phase noise and low spurious emission, partial application requires frequency synthesis to realize fine stepping frequency scanning; some applications require frequency synthesis to achieve fast switching. The conventional scheme adopts phase-locked loops to realize a fine stepping slow source and directly realize a fast jump source. The two frequency synthesis circuits are independent, and are respectively realized, so that the hardware investment required for improving the performance index is multiplied.
In order to solve the technical problems found above and meet the requirements of miniaturization, high-purity frequency spectrum, broadband and multifunction of the frequency synthesis circuit, the invention provides a miniaturized high-purity frequency spectrum broadband reconfigurable frequency synthesis circuit, a device and a method, aiming at the problems that miniaturization and broadband high-purity frequency spectrum, miniaturization and multifunction are difficult to be compatible, the invention provides the following solutions:
in the invention, a low-phase noise frame is built by adopting straight combination, and the whole frequency mixing section is moved to spread the frequency spectrum, so that the realization volume is reduced. Mixing the higher order components is suppressed by adjusting the mixer operating point. The mixer multiplies the input local oscillator LO and the intermediate frequency signal IF to generate a main signal of 1X1 (LO + -IF) and a plurality of high-order intermodulation signals S+ -T + -IF, wherein the frequency is . For the higher-order intermodulation signals, as the input intermediate frequency IF power decreases, the output power thereof decreases by a multiple of the corresponding intermediate frequency order T. Intermediate frequency signal power reduction +.>(dB), higher order intermodulation spurs are reduced (T-1) relative to the main signal power>(dB). The intermediate frequency signal power is reduced, the output high-order intermodulation spurious suppression is improved, the application index requirement is met, and the post-stage switch filtering design is simplified. But too low intermediate frequency signal will cause a difference of +.>And the high-power signal of the local oscillation link is easy to cross-talk to the low-power intermediate frequency link through a power supply and increases the power supply isolation index requirement. If the required isolation index of the local oscillator to the intermediate frequency link is +.>Then the isolation actually needed to be realized by the circuit is +.>. The conventional mixing post-filter circuit is complex and occupies large space. In the invention, the characteristic that the output power of the mixer varies with the input intermediate frequency power in multiple according to the intermediate frequency order (T) is utilized to weaken the stray influence of high-order intermodulation. Compared with the conventional scheme, the method simplifies the filtering design of the later-stage switch, does not need to filter out the high-order intermodulation spurs, and reducesAnd the filtering segmentation is carried out, so that the realization volume is reduced.
The design can increase the power difference among multiple signal chains, and the high-power signals are easier to cross talk from a power supply and a power supply loop to the low-power signal chains to form a new technical problem, so that the independent power supply is used for supplying power to each functional radio frequency link, and the ultra-high isolation among the functional signal chains is realized by matching with a loop single-point grounding scheme. By the further technical means, the broadband and the high-purity frequency spectrum are combined in a small volume.
The frequency mixing scheme provided by the invention not only effectively spreads the frequency spectrum, but also synthesizes and disassembles the broadband, high-purity frequency spectrum and multifunctional frequency into the high-purity frequency spectrum local oscillation frame construction and the function intermediate frequency implementation. The small-sized broadband high-purity frequency spectrum mixing output frame is built through time-sharing multiplexing low-noise and low-spurious local oscillators, so that the performance is improved, and the realization volume is reduced; and the function reconstruction of the whole frequency synthesis circuit is realized through function intermediate frequency switching. The intermediate frequency unit 1 realizes fine stepping frequency switching and meets the requirement of high-precision scanning; the intermediate frequency unit 2 realizes frequency fast jump and meets the requirement of fast frequency sweep. The cross talk exists among the intermediate frequency signal units, and each intermediate frequency unit is switched by adopting a radio frequency switch to match with an independent power supply, so that the double isolation of radio frequency and power supplies is realized. The local oscillator unit, the multifunctional intermediate frequency unit and the spread spectrum unit adopt loop single-point grounding, the loop direction of the power supply is solidified, the crosstalk of radio frequency signals from the power supply is avoided, and the isolation between signal chains is effectively provided. The intermediate frequency units with the functions have the same appearance, the input and output interfaces have the same design, the radio frequency, the power supply and the control definition are the same, and the in-situ exchange can be realized.
By the technical means of the invention, the miniaturized, broadband, high-purity frequency spectrum and reconfigurable multifunctional frequency synthesis are realized.
More specifically, the embodiment of the invention aims to provide a small-sized high-purity frequency spectrum broadband reconfigurable frequency synthesis circuit, a device and a method. The small-sized high-purity frequency spectrum broadband reconfigurable frequency synthesis circuit comprises a radio frequency circuit (shown in figure 1), a power supply circuit (shown in figure 2) and a control circuit (shown in figure 3). Further, the radio frequency circuit comprises a reference unit, a local oscillator unit, an intermediate frequency unit 1, an intermediate frequency unit 2 and a spread spectrum unit. In the radio frequency circuit, an intermediate frequency signal 1 and an intermediate frequency signal 2 generated by an intermediate frequency unit 1 and an intermediate frequency unit 2 are selected from a spreading unit, and are mixed with a local oscillation signal generated by a local oscillation unit to generate a frequency synthesis output. According to the spurious suppression index of the frequency synthesis circuit and the parameters of the mixer, the spurious suppression of the high-order intermodulation output of the mixer is improved by gradually reducing the power of intermediate frequency signals input into the mixer by utilizing the characteristic that the output power of the mixer is multiplied by the input intermediate frequency power according to the intermediate frequency order (T), so that independent filtering is not needed and the application requirement is met.
The design can increase the power difference among multiple signal chains, and the high-power signal is easier to cross talk from a power supply and a power supply ground to the low-power signal chain to form a new technical problem, so that the independent power supply is adopted to supply power to each functional radio frequency link, and the ultra-high isolation among the functional signal chains is realized by matching with a loop single-point grounding scheme. By the further technical means, the broadband and the high-purity frequency spectrum are combined in a small volume.
The power supply circuit adopts the same power supply inputThe input power return is commonly connected to the chassis. Input power supplyThe linear voltage stabilizing circuit 1, the linear voltage stabilizing circuit 2, the linear voltage stabilizing circuit 3 and the linear voltage stabilizing circuit 4 are connected. Wherein the linear voltage stabilizing circuit 1 generates an output voltage +.>And loop->The method comprises the steps of carrying out a first treatment on the surface of the The linear voltage stabilizing circuit 2 generates an output voltage +>And loop->The method comprises the steps of carrying out a first treatment on the surface of the The linear voltage stabilizing circuit 3 generates an output voltage +>And loop->The method comprises the steps of carrying out a first treatment on the surface of the The linear voltage stabilizing circuit 4 generates an output voltage +>And its return wire。、、、Can be independently turned off respectively, and respectively supply power to the reference unit, the local oscillator unit, the spread spectrum unit, the intermediate frequency unit 1 and the intermediate frequency unit 2 in sequence>、、、Are commonly connected with the rack through inductors L1, L2, L3 and L4 respectively. L1 is connected with one end->、One end of the device is connected with the public ground of the rack and is nearest to the public ground of the rack; l2 is connected at one endOne end is connected with the public ground of the frame, and the grounding point is far compared with L1; l3 one end is connected with->One end is connected with the public ground of the frame, and the grounding point is far compared with L2; l4 is connected with one end->One end is connected with the public ground of the rack, and the grounding point is farthest. The purpose of this design is to prevent +.>The high-power local oscillation signal chain for power supply is used for supplying power to the relatively low power through the power supply and the power supply ground>Power-supplied mixed signal chain and- >、The power-supplied intermediate frequency signal chain is crosstalking. The inductor L1 can effectively inhibit the frequency of each signal in the local oscillation unit link; the inductor L2 can effectively inhibit the frequency of each signal in the spread spectrum unit link; the inductor L3 can effectively inhibit the frequency of each signal in the link of the intermediate frequency unit 1; the inductor L4 can effectively suppress the frequencies of signals in the link of the intermediate frequency unit 2.、Along with->Synchronous work (S)/(S)>、Alternative conductionAnd (5) time sharing work. The power supply loop is grounded through an inductance single point, so that the flow direction of the power supply loop is limited, and the high isolation inhibition of the power supply loop to signals among signal chains is effectively realized.
Further, the reference unit comprises a reference generating circuit and a reference power divider. In the reference unit, a reference generating circuit generates a reference signalAmplified without additional noise, and power-divided and multiplexed to an intermediate frequency unit 1, a low-noise reference point source 1 and a low-noise reference point source 2 through a passive reference power divider.
The low noise reference point sources 1 and 2 in the intermediate frequency unit 1 and the intermediate frequency unit 2 respectively generate reference signals、Respectively compared withPhase noise by 20%>、20Deterioration, and additional noise deterioration is less than or equal to 2dB. Reference signal->、The comb line generators 1, 2 are respectively input, and each frequency step is generated>、The comb spectrum signal of (2) generates intermediate frequency signal (2) and local oscillation signal through switch filtering, frequency division, frequency multiplication and other processing links. The design can The method realizes the homologous phase correlation of the intermediate frequency signal and the local oscillation signal, and can partially offset the additional noise in the link for the later stage mixing output, thereby reducing noise degradation. The low additive noise point sources 1, 2 include, but are not limited to, dielectric oscillators, comb line generators, crystal oscillators, etc. that are designed to provide a low phase noise reference signal input to the comb line generator. The comb generator generates multiple, higher order frequency multiplied signals of the input signal, the output signal being corrupted by 20lg (X) (dB) relative to the input phase noise for an equivalent frequency multiplication factor X. Providing a low phase noise input for the comb line generator ensures low phase noise characteristics of the comb spectrum output signal. In addition, the phase noise of the mixed output signal is superposition of noise power of the input local oscillator and the intermediate frequency at the same frequency offset position, and is mainly determined by local oscillator signals with higher relative frequency and worse phase noise. By the technical means, the additional noise degradation of the local oscillator and the intermediate frequency signal is reduced, namely the noise degradation of the final frequency synthesized output signal is reduced.
The intermediate frequency unit 1 includes a phase-lock circuit 1, a phase-lock circuit 2, and a variable P-divider. The phase-locked circuit 1 inputs a reference signalThe intermediate signal of the fine step generated by the decimal mode is used as the reference input of the phase-locking circuit 2, the phase-locking circuit 2 adopts the integer phase discrimination and the phase-locking output +. >Generating intermediate frequency signals via a variable P-dividerf IF1 。
Alternatively, the intermediate frequency unit 1 and the intermediate frequency unit 2 may be formed by using a separate phase detector, a voltage-controlled oscillator and a loop filter, or may be implemented by using a single device integrating the phase detector and the voltage-controlled oscillator.
Optionally, the phase-lock circuit 2 outputs a signalCan be combined with intermediate frequency signalsf IF1 The frequency is uniform, i.e. the division ratio of the variable divider P is 1. At this time, the variable P-divider does not divide the input signal. Inputting wide power using frequency dividerWindow, output power stabilizing feature, intermediate frequency signal reductionf IF1 Power fluctuation, solidification of the post mixer operating point. Optionally, P is an integer > 1, the phase-locked circuit 2 outputs a signal +.>I.e. the output frequency of the phase lock circuit 2 is P times the frequency of the intermediate frequency signal. The spurs of the phase-locked loop output signal mainly originate from the fractional frequency division spurs of the fractional frequency division phase discrimination and the reference frequency and the reference spurs introduced by the frequency division thereof. The final phase-locked loop is enabled to work in an integer phase discrimination mode by adopting a phase-locked loop cascading mode, so that fractional frequency division spurious can be effectively reduced, but reference spurious and other additional spurious cannot be reduced. By increasing the intermediate frequency->Then P frequency division is carried out to generate intermediate frequency signalsf IF1 In addition to being able to transmit intermediate frequency signals f IF1 The output power shaping can also improve the spurious signal introduced by the phase-locked loop 2 by itself by 20lgP (dB) rejection.
The intermediate frequency unit 2 comprises a switch 1 and a band-pass filter~Switch 2, M frequency divider. Reference point frequency->The comb spectrum signal of (2) is gated to +.>~One of the filters is filtered to remove the adjacent +.>And after the far-end comb line spectrum, the switch 2 is used for gating and cascading to the M frequency divider. M frequency divider signal input to switch filter gateDividing line m to generate intermediate frequency signal +.>. The output frequency range of the intermediate frequency unit 2 is +.>~. Adjacent band-pass filter->~The frequency difference is the same, i.e.)>、、~For the arithmetic series, the gating frequency is the reference point frequency +.>Is selected by the design output frequency step-wise. Intermediate frequency signal->Is composed of a group of point frequency signals with the same adjacent frequency difference.
The output frequency ranges of the intermediate frequency unit 1 and the intermediate frequency unit 2 are consistent, the same bandwidth is covered, and the intermediate frequency unit 1 and the intermediate frequency unit 2 are set as. For the intermediate frequency unit 1, the output frequency range of the phase-locked circuit 2 needs to be covered +.>The method comprises the steps of carrying out a first treatment on the surface of the For the intermediate frequency unit 2,=，=。
the intermediate frequency unit 1 and the intermediate frequency unit 2 realize consistent process paths, and can be realized by adopting but not limited to the following modes: single component hybrid integration, SMT surface mount packaging, BGA packaging, etc. The intermediate frequency unit 1 and the intermediate frequency unit 2 have the same appearance, the same power supply, control and radio frequency interface, the same installation mode and the same hole site, and the in-situ exchange can be realized.
In the circuit of the invention, various practical modes exist, and fig. 1 shows that an intermediate frequency unit 1 and an intermediate frequency unit 2 are assembled in a frequency synthesis circuit at the same time, and function switching is realized through power supply and radio frequency double switching. In another use mode, in the circuit implementation process, only the intermediate frequency unit 1 or the intermediate frequency unit 2 can be assembled, and the function reconstruction of the frequency synthesis circuit can be realized by replacing the intermediate frequency function unit module, so as to meet different system requirements and reduce the realization space.
The local oscillation unit comprises a low noise reference point frequency 2, a comb line generator 2, a switch 3 and a band-pass filter~A switch 4 and an N-multiplier. Reference point source 2 produces->Is stepped by a comb generator 2 to +.>Is a wideband comb signal. The signal is gated to +.>~One of the filters is filtered to remove the adjacent +.>And far-end comb line spectrum, gating signal +.>The switch 4 is cascaded to an N-multiplier. N frequency multiplier +.>Frequency multiplication to generate local oscillation signal->、、…、I.e. +.>、、…、The local oscillation unit is composed of a group of point frequencies with the same frequency difference.
Intermediate frequency unit 1, intermediate frequency unit 2, local oscillation unit、、And respectively inputting the two signals into a spreading unit. The spread spectrum unit comprises a switch 5 and a numerical control attenuator The device 1, mixer, switch 6, band-pass filter +.>~A switch 7, a digital attenuator 2, a variable L-divider. Intermediate frequency signal->And intermediate frequency signal->And a switch 5 is input, and the switch 5 is matched with the linear voltage stabilizing circuit 3 and the linear voltage stabilizing circuit 4 to alternatively gate the intermediate frequency signal to the numerical control attenuator 1. The digital attenuator 1 adjusts the power of the intermediate frequency signal to be input into the mixer. The local oscillator drives a mixer, which mixes with the power-adjusted intermediate frequency signal to produce a radio frequency output RF. The RF signal input switch 6,k is selectively turned on to the band-pass filter>~The switch 7 gates the filtered signal. The output of the switch 7 is connected with the numerical control attenuator 2, the numerical control attenuator 2 adjusts the mixing output power, the numerical control attenuator 2 is connected with a variable L frequency divider in cascade, and the output of the variable L frequency divider is the output of the frequency synthesizing circuit.
The input end of the spread spectrum unit is connected with the output of the intermediate frequency unit and the output of the local oscillation unit, and the output end of the spread spectrum unit is the output of the frequency synthesis circuit. Comprising a mixer, a switch 5, a switch 6, and a bandpass filterBand-pass filter->. Intermediate frequency signal->Time-sharing multiplexing and multi-point local oscillator +.>Mixing to produce +.>Is provided.、、…、The total j local oscillation frequency points can realize 2j sections of mixing output through up-down frequency conversion. According to the invention, the mixed k groups of filtering are consistent with each other in terms of upper and lower mixing pass bands of local oscillation points, the frequency domain segmentation of the switch filter group is consistent with the mixing output segmentation, and k=2j. / >Local oscillator mixes with intermediate frequency signal, down-conversion outputs +.>~Correspond to->Passband frequency. Band-pass filter->For filtering local oscillation frequency->。Local oscillator and intermediate frequency mixing, up-conversion output~Correspond to->Passband frequency. Band-pass filter->For filtering local oscillation frequency->。
Local oscillator mixes with intermediate frequency signal, down-conversion outputs +.>~Correspond to->Passband frequency. Band-pass filter->For filtering local oscillation frequency->。Local oscillator and gating intermediate frequency mixing, up-conversion output +.>~Correspond to->Passband frequency. Band-pass filter->For the purpose ofFiltering out local oscillation frequency->。
Band-pass filter bank~The pass bands are connected with each other, and the splicing realizes the broadband output covering single octave.Representation->~A certain local oscillation frequency point in the middle.
For down-conversion splice bands:
≤。/>
for up-conversion splice bands:
≤。
for the joint of the up-conversion frequency band and the down-conversion frequency band, the lowest frequency of the up-conversion is less than or equal to the highest frequency of the down-conversion frequency band:
≤。
the above formula is simplified as:
；
the two formulas above represent:
1. the frequency difference of adjacent local oscillation signals is less than or equal to the maximum frequency difference of intermediate frequency signals;
2. and the twice of the lowest frequency of the intermediate frequency signal is less than or equal to the maximum frequency difference of the local oscillation signal. In addition, the frequency spectrum needs to be covered by the frequency spectrum of the mixing splicing implementation. The highest frequency generated by the upward variation is more than or equal to 2 times the lowest frequency generated by the downward variation.
The cross octave broadband output matched frequency division ratio realized by splicing is 1, 2, 4 and …, The variable L frequency divider can realize the downward coverage of the frequency spectrum and realize the (L+1) octave frequency spectrum broadband output.
L=0, the spliced spectrum is directly output, and the coverage frequency is~；
L=1, two-frequency division output, cover frequency~；
Because ofOverlapping coverage of the two frequency spectrums~The frequency points are omitted in the middle.
Similarly, when the final stage divider is in accordance withFrequency division, output cover frequency +.>~。
In the foregoing mixing filtering scheme, the mixed high-order spurious is not separately suppressed by the filter segments after mixing, so that in order to achieve higher consistency, the input power design of the intermediate frequency signal of the mixer is smaller, and the mixing output power is also relatively smaller. The local oscillator signal chain signal has a larger power difference relative to the intermediate frequency signal chain and the spread spectrum signal chain signal, and the crosstalk of the signal from a power supply and a power supply loop is easily caused. In order to realize high spurious suppression based on the scheme, the signal isolation of the power supply and the power supply loop to each signal chain needs to be enhanced. The reference unit, the intermediate frequency unit 1, the intermediate frequency unit 2, the local oscillator unit and the spread spectrum unit are respectively realized by adopting independent power supplies matched with inductors to isolate direct single-point grounding. The switch 5 is linked with the linear voltage stabilizing circuit 3 and the linear voltage stabilizing circuit 4, and the switch 5 gates the intermediate frequency signalWhen the linear voltage stabilizing circuit 3 works, the intermediate frequency unit 1 works, the linear voltage stabilizing circuit 4 is turned off, and the intermediate frequency unit 2 is powered off; switch 5 is turned on- >When the linear voltage stabilizing circuit 4 works, the intermediate frequency unit 2 works, the linear voltage stabilizing circuit 3 is turned off, and the intermediate frequency unit 1 is powered off. The linear voltage stabilizing circuit 3 and the linear voltage stabilizing circuit 4 are matched with the switch 5 to realize double turn-off and double isolation of radio frequency and power supply, and the isolation degree between the intermediate frequency signal 1 and the intermediate frequency signal 2 is improved.
The frequency mixing scheme utilizes the characteristic that the power of the high-order intermodulation signal of the frequency mixer varies with the input power of the intermediate frequency according to the multiple of the intermediate frequency order, and the power of the input intermediate frequency signal is adjusted to realize the requirement high-order spurious suppression. However, there is a certain bandwidth of the intermediate frequency signal, there is fluctuation in the power of the intermediate frequency signal in the band, and there is a difference in the response of the mixer to each frequency point. In order to realize that the mixer works at the optimal working point of high-order spurious suppression for different intermediate frequency points, the numerical control attenuator 1 is designed to respectively configure attenuation amounts for different frequency points and adjust the spurious indexes of mixing output. The power reduction of the intermediate frequency signal input by the mixer can cause the output power of the final stage to be reduced, and in order to keep the output power of the final stage stable, a numerical control attenuator 2 is added after the mixing. The numerical control attenuator 1 and the numerical control attenuator 2 are linked, and the attenuation amounts of the numerical control attenuator 1 and the numerical control attenuator 2 are functions of frequency for different output frequencies, namely And->Both of which have an initial amount of attenuation. For single output frequency, detecting mixed intermodulation spurious suppression of the synthesized signal at an output end, and if the design requirement is met, adjusting the control quantity of the numerical control attenuator 1 and the numerical control attenuator 2 of the frequency is not needed; if the design requirement is not satisfied, the actual measurement of the mixing intermodulation suppression is less than the requirement spurious suppression difference +.>Then the digital control attenuator 1 is adjusted, the attenuation is increased +.>The digital control attenuator 2 is synchronously adjusted, and the attenuation is reduced +.>The output signal power is kept constant. The digital control attenuator 1, the mixer and the digital control attenuator 2 form an output signal power and mixing intermodulation suppression dynamic adaptation circuit, and the output signals of all frequencies are adjusted.
The control circuit is composed of an upper computer and peripheral circuits thereof. The upper computer inputs a function and a frequency control code, synchronously decodes the function and the frequency control code into a plurality of groups of control signals, and respectively controls the phase-locked circuit 1, the phase-locked circuit 2, the linear voltage stabilizing circuits 1-4, the N frequency multiplier, the M frequency divider, the L frequency divider, the switches 1-7, the numerical control attenuator 1 and the numerical control attenuator 2. For a single output signal frequency, the control codes are linked.
In one embodiment, the method of the invention develops a 20 GHz-40 GHz small-sized high-purity frequency spectrum broadband reconfigurable frequency synthesis circuit, and better meets the application requirements.
It should be noted that, within the scope of protection defined in the claims of the present invention, the following embodiments may be combined and/or expanded, and replaced in any manner that is logical from the above specific embodiments, such as the disclosed technical principles, the disclosed technical features or the implicitly disclosed technical features, etc.
Example 1
The small high-purity frequency spectrum broadband reconfigurable frequency synthesis circuit comprises a radio frequency circuit, a power supply circuit and a control circuit, wherein the control circuit is respectively connected with the radio frequency circuit and the power supply circuit;
the radio frequency circuit adopts a direct combination construction low-phase noise frame, and mixes with an intermediate frequency signal with a set bandwidth in a time-sharing way by utilizing a multi-point local oscillator; the method comprises the steps that the characteristic that the power of a mixer high-order signal changes exponentially with the input power of an intermediate frequency (in specific implementation, the characteristic that the power of the mixer high-order intermodulation signal changes exponentially with the input power of the intermediate frequency according to the intermediate frequency) is utilized to weaken the stray influence of the high-order intermodulation, the tail end of the intermediate frequency signal is output by adopting a variable frequency divider, the in-band power fluctuation of the intermediate frequency signal is reduced by utilizing the characteristic that the output power of the frequency divider is stable under the input condition of a wide power window, the working point of a post-stage mixer is solidified, and meanwhile, the stray in the intermediate frequency band is further optimized by utilizing the frequency divider; an adjustable numerical control attenuator is adopted before and after mixing, and the working point of the mixer is adjusted in cooperation with linkage, so that the optimal spurious working point is selected under the condition of determining the link gain; the power supply circuit is grounded through matching of multipath independent power supply and single-point filtering, and is used for guaranteeing separation of signal chains and achieving high spurious suppression under the condition of simplifying a frequency mixing filtering scheme.
Example 2
On the basis of embodiment 1, the radio frequency circuit comprises a reference unit, a local oscillator unit, an intermediate frequency unit and a spread spectrum unit, wherein the intermediate frequency unit comprises an intermediate frequency unit 1 and/or an intermediate frequency unit 2; when the intermediate frequency unit comprises an intermediate frequency unit 1 and an intermediate frequency unit 2, the intermediate frequency units 1 and 2 respectively generate intermediate frequency signalsIntermediate frequency signal->After one of the spread spectrum units is selected, the frequency synthesized output is generated by mixing with the local oscillation signal generated by the local oscillation unit; when the intermediate frequency unit comprises the intermediate frequency unit 1 or the intermediate frequency unit 2, the output signals of the intermediate frequency unit 1 and the intermediate frequency unit 2 are consistent, the port definition is consistent, the interchange can be realized, and the configuration can be selected according to the function requirement.
Example 3
Based on embodiment 1, the power supply circuit includes a plurality of linear voltage stabilizing circuits using the same power supply inputThe input power return line is commonly connected with the rack;The linear voltage stabilizing circuit 1, the linear voltage stabilizing circuit 2, the linear voltage stabilizing circuit 3 and the linear voltage stabilizing circuit 4 are connected; wherein the linear voltage stabilizing circuit 1 generates an output voltage +.>And loop->The method comprises the steps of carrying out a first treatment on the surface of the The linear voltage stabilizing circuit 2 generates an output voltage +>And loop->The method comprises the steps of carrying out a first treatment on the surface of the The linear voltage stabilizing circuit 3 generates an output voltage + >And loop->The method comprises the steps of carrying out a first treatment on the surface of the The linear voltage stabilizing circuit 4 generates an output voltage +>And loop->；、、And->Respectively and independently cut off, and respectively supply power to the reference unit, the local oscillator unit, the spread spectrum unit, the intermediate frequency unit 1 and the intermediate frequency unit 2 in sequence, and the reference unit, the local oscillator unit, the spread spectrum unit, the intermediate frequency unit 1 and the intermediate frequency unit 2 are in turn in a +.>、、、Is commonly connected with the rack through L1, L2, L3 and L4 respectively; l1 is connected with one end->One end of the device is connected with the public ground of the rack and is nearest to the public ground of the rack; l2 one end is connected with->One end is connected with the public ground of the rack, and the grounding point is far away from L1; l3 one end is connected with->One end is connected with the public ground of the rack, and the grounding point is far away from L2; l4 is connected with one end->One end of the device is connected with a public ground of the frame, and the grounding point is farthest;
the inductor L1 is used for suppressing the frequency of each signal in the link of the reference unit and the local oscillator unit; the inductor L2 is used for inhibiting the frequency of each signal in the spread spectrum unit link; the inductor L3 is used for suppressing the frequency of each signal in the link of the intermediate frequency unit 1; the inductor L4 is used for suppressing the frequency of each signal in the link of the intermediate frequency unit 2;、along with->Synchronous work (S)/(S)>、And the second one is conducted according to application requirements, and the time-sharing work is performed.
Example 4
On the basis of embodiment 2, the reference unit comprises a reference generation circuit and a reference power divider, the reference generation circuit generating a reference signalThe power division is carried out by a reference power divider, and then the power division is respectively output to an intermediate frequency unit 1, an intermediate frequency unit 2 and a local oscillation unit.
Example 5
On the basis of embodiment 2, the intermediate frequency unit 1 comprises a phase-locked circuit1. Phase-locked circuit 2 and variable P-frequency divider, phase-locked circuit 1 inputs reference signalGenerating a fine stepped intermediate signal as a reference input to the phase-lock circuit 2, the phase-lock circuit 2 generating the signal +_ in integer mode>，Inputting to a variable frequency divider P, and processing by the variable frequency divider P to obtain an intermediate frequency signal +.>The variable frequency divider P includes a variable frequency divider whose frequency division ratio starts from the frequency division of 1. Alternatively, the phase-locked loop 2 can directly generate the intermediate frequency signal +.>. At this time, the P divider is divided by 1. Alternatively, the phase-locked loop 2 may generate the intermediate frequency signal frequency +.>P times of (C), at this time->。
Example 6
On the basis of the embodiment 2, the intermediate frequency unit 2 comprises a low-phase noise reference point source 1, a comb line generator 1, a switch 1,A plurality of bandpass filters, a switch 2, an M frequency divider, the plurality of bandpass filters comprising bandpass filters +.>~The method comprises the steps of carrying out a first treatment on the surface of the Reference point source 1 inputs reference signal +.>The generated reference point frequency signal +.>Generating a wideband comb signal via a comb line generator 1, the comb signal being gated to +.>~One of the filters is filtered to remove the adjacent +.>After the far-end comb line spectrum, the switch 2 is used for gating and cascading to the M frequency divider; the M frequency divider divides the M frequency of the signal of the switch filtering gating to generate an intermediate frequency signal +. >。/>
Example 7
On the basis of embodiment 2, the output frequency range of the intermediate frequency unit 2 is~Adjacent band-pass filter->~The frequency difference is the same, i.e.)>、、~Is an arithmetic series; by a means ofThe output frequency range of the intermediate frequency unit 1 is consistent with that of the intermediate frequency unit 2, the same bandwidth is covered, and the output frequency range is set as +.>For the intermediate frequency unit 1, the output frequency range of the phase-locked circuit 2 needs to be covered +.>The method comprises the steps of carrying out a first treatment on the surface of the For intermediate frequency unit 2, ">=，=。
Example 8
Based on embodiment 2, the implementation process paths of the intermediate frequency unit 1 and the intermediate frequency unit 2 are consistent, including but not limited to forms of hybrid integration, QFN packaging, BGA packaging and the like; the intermediate frequency unit 1 and the intermediate frequency unit 2 have the same appearance, the same power supply, control and radio frequency interface, the same mounting mode and the same hole site, and the in-situ exchange can be realized.
Example 9
On the basis of embodiment 2, the local oscillation unit comprises a low-phase noise reference point source 2, a comb line generator 2, a switch 3 and a plurality of band-pass filters~The switch 4 and the N frequency multiplier, said plurality of band pass filters comprising a band pass filter +.>~The method comprises the steps of carrying out a first treatment on the surface of the Reference signal is input to a reference point frequency source>Output reference signal ∈ ->. The comb generator 2 generates a step +.>Is gated to +.>~One of the filters is filtered to remove the adjacent +. >And far-end comb line spectrum, gating signal +.>The switch 4 is cascaded to the N frequency multiplier; n frequency multiplier +.>Frequency multiplication to generate local oscillation signal->、…、I.e. +.>、、…、Is an arithmetic series.
Example 10
In implementationOn the basis of example 2, the spread spectrum unit includes a switch 5, a digitally controlled attenuator 1, a mixer, a switch 6, and a band pass filter~A switch 7, a digital controlled attenuator 2 and a variable L frequency divider; intermediate frequency signal->And intermediate frequency signal->The switch 5 is input, and the switch 5 is matched with the linear voltage stabilizing circuit 3 and the linear voltage stabilizing circuit 4 to alternately strobe the intermediate frequency signal to the numerical control attenuator 1; the digital control attenuator 1 adjusts the power of the intermediate frequency signal to be input into the mixer, and adds attenuation +.>The method comprises the steps of carrying out a first treatment on the surface of the Local oscillator driving mixer for mixing with power-adjusted intermediate frequency signal to generate RF output signal>The method comprises the steps of carrying out a first treatment on the surface of the The RF output signal->An input switch 6 for switching on the multiple paths to the band-pass filter>~The switch 7 gates the filtered signal; the output of the switch 7 is connected with the numerical control attenuator 2, and the numerical control attenuator 2 adds attenuation to the mixed output power>The digital control attenuator 2 is cascaded with a variable L-frequency divider, the variable L-frequency divider output being the frequency synthesizing circuit output. The variable L frequency divider has a frequency division ratio of 1, 2, < >>、…. Mixing output signal +. >The coverage spans a single octave, in conjunction with a variable L divider, spreads the spectrum down, covering the (l+1) octave output.
Example 11
Based on embodiment 1, the control circuit includes an upper computer and its peripheral circuits, the upper computer inputs a function and a frequency control code, and decodes the function and the frequency control code into a plurality of groups of control signals synchronously, and controls the phase-locked circuit 1, the phase-locked circuit 2, the linear voltage stabilizing circuit 1-the linear voltage stabilizing circuit 4, the P frequency divider, the N frequency multiplier, the M frequency divider, the L frequency divider, the switch 1-the switch 7, the digital control attenuator 1 and the digital control attenuator 2 respectively; for a single output signal frequency, the frequency control codes are linked.
Example 12
A small-sized high-purity spectrum broadband reconfigurable frequency synthesizing apparatus comprising the small-sized high-purity spectrum broadband reconfigurable frequency synthesizing circuit according to any one of embodiments 1 to 11.
Example 13
A method for synthesizing a small-sized high-purity spectrum broadband reconfigurable frequency, which is implemented based on the small-sized high-purity spectrum broadband reconfigurable frequency synthesizing circuit according to any one of embodiments 1 to 11, and comprises the following steps:
in the spread spectrum unit, a control switch 5 is linked with a linear voltage stabilizing circuit 3 and a linear voltage stabilizing circuit 4, and the switch 5 gates an intermediate frequency signal When the linear voltage stabilizing circuit 3 works, the intermediate frequency unit 1 works, the linear voltage stabilizing circuit 4 is turned off, and the intermediate frequency unit 2 is powered off;
when the control switch 5 gates the intermediate frequency signalLinear voltage regulation at the timeThe circuit 4 works, the intermediate frequency unit 2 works, the linear voltage stabilizing circuit 3 is turned off, and the intermediate frequency unit 1 is powered off; the linear voltage stabilizing circuit 3 and the linear voltage stabilizing circuit 4 are controlled to be matched with the switch 5 to realize double-cut-off and double-isolation of radio frequency and power supply, and intermediate frequency signals are improved>Intermediate frequency signal->Isolation between the two.
Example 14
A small-sized high-purity spectrum broadband reconfigurable frequency synthesizing method implemented based on the small-sized high-purity spectrum broadband reconfigurable frequency synthesizing circuit according to embodiment 9, and in the spread spectrum unit, comprising the following operation steps:
input intermediate frequency signal is time-division multiplexed and is combined with multipoint local oscillatorMixing to produce +.>Wherein +.>、、…、J point local oscillators are used for realizing 2*j sections of mixing output;
selecting switch filtering segments after mixing~The method is only used for filtering local oscillator leakage generated by mixing, and high-order intermodulation spurs generated by mixing are suppressed and optimized by adopting a mode of adjusting the working point of the mixer.
Example 15
The method for synthesizing the small-sized high-purity frequency spectrum broadband reconfigurable frequency is realized based on the small-sized high-purity frequency spectrum broadband reconfigurable frequency synthesizing circuit according to any one of the embodiment 1 to the embodiment 11, and in the spread spectrum unit, the digital control attenuator 1, the mixer and the digital control attenuator 2 form an output signal power and mixing intermodulation suppression dynamic adaptation circuit, and the method specifically comprises the following steps of:
The numerical control attenuator 1 and the numerical control attenuator 2 are controlled to be linked, and the attenuation amounts of the numerical control attenuator 1 and the numerical control attenuator 2 are functions of frequency under different working states, and are set asAnd->Both have an initial amount of attenuation;
for single output frequency, detecting the mixed intermodulation spurious suppression of the synthesized signal at an output end, and if the design requirement is met, adjusting the numerical control attenuator 1 and the numerical control attenuator 2 of the frequency is not needed; if the design requirement is not satisfied, the spurious suppression of the faithful measurement mixing intermodulation spurious suppression is higher than the required spurious suppression differenceThen the digital control attenuator 1 is adjusted, the attenuation is increased +.>After the power of the intermediate frequency signal is reduced, the power of the mixed output main signal is reduced +>The intermediate frequency order difference of the mixed high-order intermodulation signal is more than or equal to 1 compared with that of the main signal, and the main signal suppresses and improves the mixed intermodulation spurious signals more than or equal to ∈1->The method comprises the steps of carrying out a first treatment on the surface of the Synchronously adjusting the numerical control attenuator 2, the attenuation is reduced +.>The output signal power is kept constant.
Example 16
A method for synthesizing a small-sized high-purity spectrum broadband reconfigurable frequency, which is implemented based on the small-sized high-purity spectrum broadband reconfigurable frequency synthesizing circuit according to any one of embodiments 1 to 11, and comprises the following steps:
in the implementation process of the circuit, an intermediate frequency unit 1 and an intermediate frequency unit 2 are assembled at the same time, and the function switching is realized through the double switching of a power supply and a radio frequency; or in the circuit implementation process, only the intermediate frequency unit 1 or the intermediate frequency unit 2 is assembled, and the function reconstruction of the frequency synthesis circuit is realized by replacing the intermediate frequency function unit module so as to meet different system requirements, and meanwhile, the realization space is reduced.
In addition to the foregoing examples, those skilled in the art will recognize from the foregoing disclosure that other embodiments can be made and in which various features of the embodiments can be interchanged or substituted, and that such modifications and changes can be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (16)

1. The small high-purity frequency spectrum broadband reconfigurable frequency synthesis circuit is characterized by comprising a radio frequency circuit, a power supply circuit and a control circuit, wherein the control circuit is respectively connected with the radio frequency circuit and the power supply circuit;
the radio frequency circuit adopts a direct combination construction low-phase noise frame, and mixes with an intermediate frequency signal with a set bandwidth in a time-sharing way by utilizing a multi-point local oscillator; the method comprises the steps that the influence of high-order intermodulation spurs is weakened by utilizing the characteristic that the power of a high-order signal of a mixer varies with the input power of an intermediate frequency in multiple orders, the tail end of the intermediate frequency signal is output by adopting a variable frequency divider, in-band power fluctuation of the intermediate frequency signal is reduced by utilizing the characteristic that the output power of the frequency divider is stable under the input condition of a wide power window, the working point of a post-stage mixer is solidified, and meanwhile, the spurs in the intermediate frequency band are further optimized by utilizing the frequency divider; an adjustable numerical control attenuator is adopted before and after mixing, and the working point of the mixer is adjusted in cooperation with linkage, so that the optimal spurious working point is selected under the condition of determining the link gain; the power supply circuit is grounded through matching of multipath independent power supply and single-point filtering, and is used for guaranteeing separation of signal chains and achieving high spurious suppression under the condition of simplifying a frequency mixing filtering scheme.
2. The small-sized high-purity spectrum broadband reconfigurable frequency synthesis circuit according to claim 1, wherein the radio frequency circuit comprises a reference unit, a local oscillator unit, an intermediate frequency unit and a spread spectrum unit, and the intermediate frequency unit comprises an intermediate frequency unit 1 and/or an intermediate frequency unit 2; when the intermediate frequency unit comprises an intermediate frequency unit 1 and an intermediate frequency unit 2, the intermediate frequency units 1 and 2 respectively generate intermediate frequency signalsIntermediate frequency signal->After one of the spread spectrum units is selected, the frequency synthesized output is generated by mixing with the local oscillation signal generated by the local oscillation unit; when the intermediate frequency unit comprises the intermediate frequency unit 1 or the intermediate frequency unit 2, the output signals of the intermediate frequency unit 1 and the intermediate frequency unit 2 are consistent, the port definition is consistent, the interchange can be realized, and the configuration can be selected according to the function requirement.
3. The small-sized high-purity spectrum broadband reconfigurable frequency synthesizing circuit according to claim 1, wherein the power supply circuit comprises a plurality of linear voltage stabilizing circuits, and the same power supply input is adoptedThe input power return line is commonly connected with the rack;the linear voltage stabilizing circuit 1, the linear voltage stabilizing circuit 2, the linear voltage stabilizing circuit 3 and the linear voltage stabilizing circuit 4 are connected; wherein the linear voltage stabilizing circuit 1 generates an output voltage +. >And loop->The method comprises the steps of carrying out a first treatment on the surface of the The linear voltage stabilizing circuit 2 generates an output voltage +>And loop->The method comprises the steps of carrying out a first treatment on the surface of the The linear voltage stabilizing circuit 3 generates an output voltage +>And loop->The method comprises the steps of carrying out a first treatment on the surface of the The linear voltage stabilizing circuit 4 generates an output voltage +>And its return wire；、、And->Respectively and independently cut off, and respectively supply power to the reference unit, the local oscillator unit, the spread spectrum unit, the intermediate frequency unit 1 and the intermediate frequency unit 2 in sequence, and the reference unit, the local oscillator unit, the spread spectrum unit, the intermediate frequency unit 1 and the intermediate frequency unit 2 are in turn in a +.>、、、Is commonly connected with the rack through L1, L2, L3 and L4 respectively; l1 is connected with one end->One end of the device is connected with the public ground of the rack and is nearest to the public ground of the rack; l2 one end is connected with->One end is connected with the public ground of the rack, and the grounding point is far away from L1; l3 one end is connected with->One end is connected with the public ground of the rack, and the grounding point is far away from L2; l4 is connected with one end->One end of the device is connected with a public ground of the frame, and the grounding point is farthest;
the inductor L1 is used for suppressing the frequency of each signal in the link of the reference unit and the local oscillator unit; the inductor L2 is used for inhibiting the frequency of each signal in the spread spectrum unit link; the inductor L3 is used for suppressing the frequency of each signal in the link of the intermediate frequency unit 1; the inductor L4 is used for suppressing the frequency of each signal in the link of the intermediate frequency unit 2;、along with external power supply->Synchronous work (S)/(S)>、And the second one is conducted according to application requirements, and the time-sharing work is performed.
4. The small-sized high-purity spectrum broadband reconfigurable frequency synthesizing circuit according to claim 2, wherein the reference unit comprises a reference generating circuit and a reference power divider, the reference generating circuit generating a reference signal The power division is carried out by a reference power divider, and then the power division is respectively output to an intermediate frequency unit 1, an intermediate frequency unit 2 and a local oscillation unit.
5. The small-sized high-purity spectrum broadband reconfigurable frequency synthesizing circuit according to claim 2, wherein the intermediate frequency unit 1 comprises a phase-locked circuit 1, a phase-locked circuit 2 and a variable P-divider, the phase-locked circuit 1 inputs a reference signalGenerating a fine stepped intermediate signal as a reference input to the phase-lock circuit 2, the phase-lock circuit 2 generating the signal +_ in integer mode>，Input to a variable P frequency divider, and processed by the variable P frequency divider to generate an intermediate frequency signal +.>。
6. The small-sized high-purity spectrum broadband reconfigurable frequency synthesizing circuit according to claim 2, wherein the intermediate frequency unit 2 comprises a low-phase noise reference point source 1, a comb line generator 1, a switch 1,A plurality of bandpass filters, a switch 2, an M frequency divider, the plurality of bandpass filters comprising bandpass filters +.>~The method comprises the steps of carrying out a first treatment on the surface of the Reference point source 1 inputs reference signal +.>The generated reference point frequency signalGenerating a wideband comb signal via a comb line generator 1, the comb signal being gated to +.>~One of the filters is filtered to remove the adjacent +.>After the far-end comb line spectrum, the switch 2 is used for gating and cascading to the M frequency divider; the M frequency divider divides the M frequency of the signal of the switch filtering gating to generate an intermediate frequency signal +. >。
7. The small-sized high-purity spectrum broadband reconfigurable frequency synthesizing circuit according to claim 2, wherein the output frequency range of the intermediate frequency unit 2 is~Adjacent toBand-pass filter->~The frequency difference is the same, i.e.)>、、~Is an arithmetic series; the output frequency ranges of the intermediate frequency unit 1 and the intermediate frequency unit 2 are consistent, the same bandwidth is covered, and the intermediate frequency unit is set asFor the intermediate frequency unit 1, the output frequency range of the phase-locked circuit 2 needs to be covered +.>The method comprises the steps of carrying out a first treatment on the surface of the For intermediate frequency unit 2, ">=，=。
8. The small-sized high-purity frequency spectrum broadband reconfigurable frequency synthesis circuit according to claim 2, wherein the implementation process paths of the intermediate frequency unit 1 and the intermediate frequency unit 2 are consistent; the intermediate frequency unit 1 and the intermediate frequency unit 2 have the same appearance, the same power supply, control and radio frequency interface, the same mounting mode and the same hole site, and the in-situ exchange can be realized.
9. The small-sized high-purity spectrum broadband reconfigurable frequency synthesis circuit according to claim 2, wherein the local oscillator unit comprises a low-phase noise reference point source 2, a comb line generator 2, a switch 3, a plurality of band-pass filters~The switch 4 and the N frequency multiplier, said plurality of band pass filters comprising a band pass filter +.>~The method comprises the steps of carrying out a first treatment on the surface of the Reference signal is input to a reference point frequency source>Output reference signal ∈ - >The method comprises the steps of carrying out a first treatment on the surface of the The comb generator 2 generates a step +.>Is gated to +.>~One of the filters is filtered to remove the adjacent +.>And far-end comb line spectrum, gating signal +.>The switch 4 is cascaded to the N frequency multiplier; n frequency multiplier +.>Frequency multiplication to generate local oscillation signal->、…、I.e. +.>、、…、Is an arithmetic series.
10. The small-sized high-purity spectrum broadband reconfigurable frequency synthesizing circuit according to claim 2, wherein the spread spectrum unit comprises a switch 5, a digitally controlled attenuator 1, a mixer, a switch 6, a band-pass filter~A switch 7, a digital controlled attenuator 2 and a variable L frequency divider; intermediate frequency signal->And intermediate frequency signal->The switch 5 is input, and the switch 5 is matched with the linear voltage stabilizing circuit 3 and the linear voltage stabilizing circuit 4 to alternatively gate the intermediate frequency signal toA numerical control attenuator 1; the digital control attenuator 1 adjusts the power of the intermediate frequency signal to be input into the mixer, and adds attenuation +.>The method comprises the steps of carrying out a first treatment on the surface of the Local oscillator driven mixer for mixing with power-adjusted intermediate frequency signal to generate RF output signalThe method comprises the steps of carrying out a first treatment on the surface of the The RF output signal->An input switch 6 for switching on the multiple paths to the band-pass filter>~The switch 7 gates the filtered signal; the output of the switch 7 is connected with the numerical control attenuator 2, and the numerical control attenuator 2 adds attenuation to the mixed output power >The digital control attenuator 2 is cascaded with a variable frequency divider L, and the output of the variable frequency divider L is the output of the frequency synthesizing circuit.
11. The small-sized high-purity frequency spectrum broadband reconfigurable frequency synthesis circuit according to claim 1, wherein the control circuit comprises an upper computer and a peripheral circuit thereof, the upper computer inputs a function and a frequency control code and synchronously decodes the function and the frequency control code into a plurality of groups of control signals, and the control signals respectively control a phase-locked circuit 1, a phase-locked circuit 2, a linear voltage stabilizing circuit 1-a linear voltage stabilizing circuit 4, a P frequency divider, an N frequency multiplier, an M frequency divider, an L frequency divider, a switch 1-a switch 7, a numerical control attenuator 1 and a numerical control attenuator 2; for a single output signal frequency, the frequency control codes are linked.
12. A small-sized high-purity spectrum broadband reconfigurable frequency synthesizing apparatus, characterized by comprising the small-sized high-purity spectrum broadband reconfigurable frequency synthesizing circuit according to any one of claims 1 to 11.
13. A method for synthesizing a small-sized high-purity spectrum wideband reconfigurable frequency, which is realized based on the small-sized high-purity spectrum wideband reconfigurable frequency synthesizing circuit as claimed in any one of claims 1 to 11, and comprises the following steps:
in the spread spectrum unit, a control switch 5 is linked with a linear voltage stabilizing circuit 3 and a linear voltage stabilizing circuit 4, and the switch 5 gates an intermediate frequency signal When the linear voltage stabilizing circuit 3 works, the intermediate frequency unit 1 works, the linear voltage stabilizing circuit 4 is turned off, and the intermediate frequency unit 2 is powered off;
when the control switch 5 gates the intermediate frequency signalWhen the linear voltage stabilizing circuit 4 works, the intermediate frequency unit 2 works, the linear voltage stabilizing circuit 3 is turned off, and the intermediate frequency unit 1 is powered off; the linear voltage stabilizing circuit 3 and the linear voltage stabilizing circuit 4 are controlled to be matched with the switch 5 to realize double-cut-off and double-isolation of radio frequency and power supply, and intermediate frequency signals are improved>Intermediate frequency signal->Isolation between the two.
14. A method of small high purity spectral wideband reconfigurable frequency synthesis, characterized in that it is implemented based on a small high purity spectral wideband reconfigurable frequency synthesis circuit according to claim 9, and in that it comprises the following operating steps in the spreading unit:
input intermediate frequency signal is time-division multiplexed and is combined with multipoint local oscillatorMixing to produce +.>Wherein +.>、、…、J point local oscillators are used for realizing 2*j sections of mixing output;
selecting switch filtering segments after mixing~The method is only used for filtering local oscillator leakage generated by mixing, and high-order intermodulation spurs generated by mixing are suppressed and optimized by adopting a mode of adjusting the working point of the mixer.
15. The method for synthesizing the small-sized high-purity frequency spectrum broadband reconfigurable frequency is characterized in that the method is realized based on the small-sized high-purity frequency spectrum broadband reconfigurable frequency synthesizing circuit according to any one of claims 1-11, and in the spread spectrum unit, the numerical control attenuator 1, the mixer and the numerical control attenuator 2 form an output signal power and mixing intermodulation suppression dynamic adaptation circuit, and the method specifically comprises the following steps of:
The numerical control attenuator 1 and the numerical control attenuator 2 are controlled to be linked, and the attenuation amounts of the numerical control attenuator 1 and the numerical control attenuator 2 are functions of the frequencies and are set as follows for different output frequencies under different working statesAnd->Both have an initial amount of attenuation;
for single output frequency, detecting the mixed intermodulation spurious suppression of the synthesized signal at an output end, and if the design requirement is met, adjusting the numerical control attenuator 1 and the numerical control attenuator 2 of the frequency is not needed; if the design requirement is not satisfied, judging the spurious corresponding to the frequency mixing intermodulation order, and comparing the spurious suppression of the actual test frequency mixing intermodulation with the spurious suppression difference of the requirementThen the digital control attenuator 1 is adjusted, the attenuation is increased +.>After the power of the intermediate frequency signal is reduced, the power of the mixed output main signal is reduced +>The intermediate frequency order difference of the mixed high-order intermodulation signal is more than or equal to 1 compared with that of the main signal, and the main signal suppresses and improves the mixed intermodulation spurious signals more than or equal to ∈1->The method comprises the steps of carrying out a first treatment on the surface of the Synchronously adjusting the numerical control attenuator 2, the attenuation is reduced +.>The output signal power is kept constant.
16. A method for synthesizing a small-sized high-purity spectrum wideband reconfigurable frequency, which is realized based on the small-sized high-purity spectrum wideband reconfigurable frequency synthesizing circuit as claimed in any one of claims 1 to 11, and comprises the following steps:
In the implementation process of the circuit, an intermediate frequency unit 1 and an intermediate frequency unit 2 are assembled at the same time, and the function switching is realized through the double switching of a power supply and a radio frequency; or in the circuit implementation process, only the intermediate frequency unit 1 or the intermediate frequency unit 2 is assembled, and the function reconstruction of the frequency synthesis circuit is realized by replacing the intermediate frequency function unit module so as to meet different system requirements, and meanwhile, the realization space is reduced.
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