CN112073064A - Broadband signal generation device and method based on self-adaptive correction - Google Patents
Broadband signal generation device and method based on self-adaptive correction Download PDFInfo
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Abstract
The invention discloses a broadband signal generating device and method based on self-adaptive correction, wherein the device comprises a phase accumulation unit module, a phase amplitude conversion unit module, a DAC circuit module, a radio frequency processing circuit module, an ADC circuit module, a signal detection and processing unit module, a stray control unit module and a stray correction signal generating unit module; the method comprises the steps of feeding back at a DDS signal output end for high-speed sampling, realizing the spurious extraction and characteristic analysis of broadband output signals in a self-adaptive manner, acquiring the frequency, amplitude and phase information of spurious signals, increasing output N paths of correction signals in a signal generation structure or driving a parallel DAC to output N paths of correction signals, generating correction signals with same frequency, opposite phase and basically equal amplitude, and realizing the spurious suppression through the synthesis of the output signals and the correction signals; wherein N is more than or equal to 1 and the like; the invention realizes the spurious suppression effect and improves the spurious-free dynamic range of the broadband DDS output signal.
Description
Technical Field
The present invention relates to the field of direct digital synthesizers, and more particularly, to a wideband signal generating apparatus and method based on adaptive correction.
Background
A Direct Digital Synthesizer (DDS) is widely used in the fields of radar, electronic warfare, communication, surveying and mapping, and instruments, and is usually used as a signal source or an excitation device to drive the whole system. The direct digital synthesizer is from the angle of phase, the phase accumulator is used for accumulating the frequency control word to obtain the address information corresponding to the phase value, the amplitude value of sine and cosine function is mapped through the address of the phase value to obtain the digital sequence of the needed waveform, and then the analog waveform is obtained through DAC output.
The direct digital synthesizer has the advantages of high output frequency precision, easy waveform control, continuous and controllable phase, high frequency conversion speed and small volume, is very suitable for the fields of software radio and the like, but is limited by the self of a DAC (digital-to-analog converter) device and the limitation of a frequency synthesis system, and the broadband spurious-free dynamic range (SFDR) of the signal generator is relatively low and cannot be directly used in the occasions with high requirements on part of signal-to-noise ratios. The DDS is a circuit system based on digital sampling, spurious signals are introduced into the sampling circuit system due to truncation errors, quantization errors and the like and DAC conversion nonlinear errors, and the spurious signals often fall into the frequency band bandwidth required by people, so that the spurious-free dynamic range index of output signals is poor.
Aiming at the mechanism of the DDS spurious generation, a lot of research is carried out at home and abroad to promote spurious suppression. In order to weaken stray caused by phase truncation, a method of increasing a phase diter and an amplitude diter is adopted, energy of stage errors is dispersed in a full spectrum range through random jitter, a high stray peak value is prevented from being formed, and meanwhile, the substrate noise does not change too much, so that the stray rejection performance is improved. The ideal DAC has linear characteristic, can convert the input frequency control word into radio frequency output with fixed proportionality coefficient, the actual DAC influenced by factors such as DAC device design performance, power supply, clock leakage has nonlinear characteristic and instantaneous burr, the correction method of balancing DAC or partial predicted signal (such as harmonic wave) is mainly adopted at home and abroad for the spurs, the method depends on the predictability and stability for controlling frequency, phase and amplitude, the correction method is time-consuming and labor-consuming, the spurious point suppression is limited, and the method is not suitable for broadband application. In addition, some researchers select a linear power supply with small power supply ripple and a reference clock signal with good quality, design the reference clock signal by optimizing a filter and electromagnetic compatibility design, and reasonably select a good output frequency band to obtain a good result, but the output effect of the design of any frequency point of a broadband is still poor.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a broadband signal generation device and method based on adaptive correction, which can realize the adaptive extraction of the spurious characteristic parameters of broadband output signals, realize the spurious suppression effect and improve the spurious-free dynamic range of the broadband DDS output signals.
The purpose of the invention is realized by the following scheme:
a broadband signal generating device based on self-adaptive correction comprises a phase accumulation unit module, a phase amplitude conversion unit module, a DAC circuit module, a radio frequency processing circuit module, an ADC circuit module, a signal detection and processing unit module, a stray control unit module and a stray correction signal generating unit module; the phase accumulation unit module obtains an N-bit continuous digital phase value through accumulation of an input M-bit frequency control word FTW, intercepts P-bit phase information for driving continuous amplitude information of an output signal of the phase amplitude conversion unit module, intercepts D-bit amplitude for driving the DAC circuit module to convert a digital signal into an analog signal and output the analog signal to the radio frequency processing circuit module, outputs a target frequency signal to the ADC circuit module by the radio frequency processing circuit module, outputs the target frequency signal to the signal detection and processing unit module by the ADC circuit module for signal detection and processing, then adaptively outputs stray signal characteristic information of a detection signal to the stray control unit module, and generates characteristic parameters of an N-path correction signal by the stray control unit module according to the input FTW and the stray signal characteristic information, n is more than or equal to 1; the stray signal correction signal generation unit module performs phase accumulation according to FTW parameters of stray signals, adjusts the input of the phase amplitude conversion unit module according to the phase of input stray signals, and adjusts the amplitude of correction signals according to the amplitude of input stray signals, so as to finally output required correction signals; the main circuit output signal and the correction signal are synthesized before entering the DAC circuit module and are output by the DAC circuit module; or the signals are synthesized after being output by the DAC circuit modules.
Furthermore, the signal detection and processing unit module comprises a signal detection unit, a parameter extraction unit and a signal processing unit, wherein the signal detection unit is used for detecting discrete signals, the parameter extraction unit is used for extracting characteristic values of output target frequencies, and the signal processing unit is used for screening spurious signals to be processed to realize self-adaptive extraction of spurious signal characteristics. .
Furthermore, the stray control unit module comprises a stray extraction unit, a characteristic analysis unit and a parameter generation unit, wherein the stray extraction unit is used for stray signal characteristic information, the characteristic analysis unit is used for carrying out analysis and calculation according to the input FTW and the stray signal characteristic information, and the parameter generation unit is used for generating characteristic parameters of the N paths of correction signals.
Furthermore, the spur correction signal generation unit module includes a phase adjustment unit and an amplitude adjustment unit, where the phase adjustment unit is configured to adjust an output phase of the correction signal, and after phase-amplitude conversion, the amplitude adjustment unit adjusts an amplitude range of the correction signal.
Further, the radio frequency processing circuit includes a low-pass filter, a power amplifier, and two power dividers, where the low-pass filter is used to implement low-pass filtering of an output signal, the power amplifier is used to implement linear amplification, and the two power dividers are used to divide power to output.
A broadband signal generating method based on adaptive correction is characterized in that high-speed sampling is carried out on feedback of a DDS signal output end, the spurious extraction and characteristic analysis of broadband output signals are realized in a self-adaptive mode, the frequency, amplitude and phase information of spurious signals are obtained, N correction signals are output in an increased mode or parallel DACs are driven to output the N correction signals, correction signals with the same frequency, opposite phase and basically equal amplitude are generated, and spurious suppression is realized through synthesis of the output signals and the correction signals; wherein N is more than or equal to 1.
Further, comprising:
step 2, the radio frequency processing circuit outputs a path of signal to an ADC circuit moduleBlock for modularly selecting the bandwidth B of the matched output signal by means of an ADC circuitwAnd the target frequency f is output by the ADC circuit module according to the requirements of the dynamic range SFDRoutThe discrete digital signal s (n) is output;
step 3, detecting the discrete signal and extracting and outputting the target frequency foutCharacteristic value of, acquiring a spur signal according to a spur suppression requirement
Frequency, phase and amplitude parameters of;
step 4, calculating FTW of the spurious signal according to the signal detection result in the step 3 and the frequency control word FTW of the input signaliPhase thetaiAnd relative amplitude AiThe stray control unit module selects a branch circuit which outputs a signal needing to be corrected according to requirements;
and 6, synthesizing the main circuit output signal and the correction signal before entering the DAC circuit module, and outputting the synthesized signals by the DAC circuit module, or synthesizing the signals after outputting the synthesized signals by a plurality of DAC circuit modules.
Further, comprising: and 7, changing the FTW, and repeating the steps 1 to 6 to realize large dynamic output of the broadband signal.
Further, in step 1, the operation clock fclkWith an output frequency of
Further, in step 3, the discrete signal is detected after DFT conversion.
The invention has the beneficial effects that:
(1) the invention realizes the stray characteristic parameter self-adaptive extraction of broadband output signals, particularly, the self-adaptive extraction of the stray characteristic (frequency, phase and amplitude) of signals introduced by phase truncation error, amplitude quantization error, DAC nonlinear error, digital sampling error, reference clock and the like in any output signal bandwidth can be flexibly realized through the acquisition of a feedback branch ADC, the detection of signals, the extraction of parameters and the processing of signals, the defects that the generation mechanisms of various types of stray of the traditional DDS are different and the stray signals with larger size can not be predicted and processed uniformly are overcome, and the larger stray signals can be processed selectively according to different application scenes.
(2) The invention realizes the self-adaptive generation of the correction signal according to the characteristic parameters to improve the output dynamics of the DAC, and particularly, the spurious signals introduced due to aliasing, truncation errors, quantization errors and the like of the DDS can fall into the frequency band bandwidth required by people, so that the spurious suppression index of the output signal is poor. According to the invention, the frequency control word, the phase-reversed adjustment quantity and the relative amplitude control quantity of the spurious signal are obtained comprehensively according to the spurious signal self-adaptive detection result and the frequency control word of the input signal, N (N is more than or equal to 1) paths of correction branch circuits are added in a self-adaptive manner to be synthesized with the main path signal, and the spurious signal correction is realized, so that the spurious-free dynamic range of the DAC output signal is effectively improved.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a block diagram of a wideband signal generator of the present invention;
FIG. 2 is a block diagram of the signal detection and processing unit;
FIG. 3 is a block diagram of a spur control unit;
FIG. 4 is a block diagram of a spur correction signal generation unit;
FIG. 5 is a graph of DDS output spectrum prior to the use of the present technique;
FIG. 6 is a DDS output spectrum graph after the technique of the present invention is employed;
in the figure, 11-phase accumulation unit module, 12-phase amplitude conversion unit module, 13-DAC circuit module (M is parallel processing, M is more than or equal to 1), 14-radio frequency processing circuit module, 15-ADC circuit module, 16-signal detection and processing unit module, 17-spurious control unit module, 18-spurious correction signal generation unit module; 21-a signal detection unit; 22-parameter extraction unit; 23-a signal processing unit; 31-a stray extraction unit; 32-a feature analysis unit; 33-a parameter generation unit; 34-a control unit; 41-phase accumulation unit; 42-a phase amplitude conversion unit; 43-a phase adjustment unit; 44-amplitude adjustment unit.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following. All of the features disclosed in this specification, or all of the steps of a method or process so disclosed, may be combined in any combination, except combinations where mutually exclusive features and/or steps are used.
As shown in fig. 1 to 6, a wideband signal generating apparatus based on adaptive correction includes a phase accumulation unit module 11, a phase amplitude conversion unit module 12, a DAC circuit module 13, a radio frequency processing circuit module 14, an ADC circuit module 14, a signal detection and processing unit module 16, a spurious control unit module 17, and a spurious correction signal generating unit module 18; the phase accumulation unit module 11 accumulates the M-bit frequency control word FTW to obtain N-bit continuous digital phase values, intercepts P-bit phase information for driving the phase amplitude conversion unit module 12 to output continuous amplitude information of signals, intercepts D-bit amplitudes for driving the DAC circuit module 13 to convert digital signals into analog signals and output the analog signals to the rf processing circuit module 14, the rf processing circuit module 14 outputs target frequency signals to the ADC circuit module 15, the ADC circuit module 15 outputs the target frequency signals to the signal detection and processing unit module 16 for signal detection and processing, then, the signal detection and processing unit module 16 adaptively outputs the characteristic information of the stray signals of the detection signals to the stray control unit module 17, the stray control unit module 17 generates characteristic parameters of N paths of correction signals according to the input FTW and the characteristic information of the stray signals, and N is greater than or equal to 1; the spurious correction signal generation unit module 8 performs phase accumulation according to the FTW parameter of the spurious signal, adjusts the input of the phase amplitude conversion unit module 12 according to the phase of the input spurious signal, and the phase amplitude conversion unit module 12 adjusts the amplitude of the correction signal according to the amplitude of the input spurious signal, and finally outputs the required correction signal; the main circuit output signal and the correction signal are synthesized before entering the DAC circuit module 13 and are output by the DAC circuit module 13; or the signals are output by a plurality of DAC circuit modules 13 and then are synthesized.
The invention adaptively analyzes the output signal to obtain the frequency, phase and relative amplitude characteristics (not limited to predictable stray signals or to stray signals with stable frequency, phase and amplitude) of various stray signals, generates a correction signal according to the characteristic parameters of the stray signals, realizes stray suppression, and improves the SFDR performance of the broadband DDS output signal. Specifically, the invention discloses a broadband signal generation method and device based on self-adaptive correction, which are characterized in that high-speed sampling is carried out on feedback at a DDS signal output end, the stray extraction and characteristic analysis of a broadband output signal are realized in a self-adaptive mode, the frequency, amplitude and phase information of a stray signal are obtained, N (N is more than or equal to 1) paths of correction signals are output in a signal generation structure in an additional mode or a parallel DAC is driven to output N (N is more than or equal to 1) paths of correction signals, correction signals with the same frequency, the opposite phase and the basically same amplitude are generated, the stray suppression effect is realized through the synthesis of the output signals and the correction signals, and the spurious-free dynamic range of.
Specifically, the phase accumulation unit module 11 is driven by a system clock to accumulate according to an M-bit frequency control word FTW to obtain an N-bit continuous digital phase value, and then truncates to P bits according to a performance requirement, and the frequency precision of the DDS is determined by a binary bit width N of the phase accumulation unit. The phase amplitude conversion unit module 12 obtains sine and cosine through nonlinear mapping by using the P-bit digital phase information after phase truncation, outputs a D-bit amplitude value after the truncation, and is used for driving the DAC circuit module 13 to output, the DAC circuit module 13 completes the process of converting discrete digital signals into analog signals, and the amplitude response of the output signals is an SINC function. Optionally, the radio frequency processing circuit module 14 may be formed by a low-pass filter, a power amplifier, a two-power divider, and the like, and may implement low-pass filtering, linear amplification, and power division output functions of the output signal. The ADC circuit module 15 completes the process of converting the analog signal into the discrete digital signal, and the ADC circuit module 15 selects and matches the bandwidth output by the DAC circuit module 13, thereby satisfying the requirement of nyquist sampling theorem.
The signal detection and processing unit module 16 is composed of signal detection, parameter extraction, signal processing and the like, and can detect and process discrete digital signals output by the ADC circuit module 15, and adaptively output frequency, phase and amplitude information of the detection signals. The signal detection part finishes the functions of signal extraction and detection in an output bandwidth, the parameter extraction part finishes the multi-dimensional parameter extraction of each signal of the broadband according to a signal detection result, and the signal processing part screens the stray signals needing to be processed according to a control requirement to realize the process of adaptively extracting the characteristics of the stray signals. And the stray control unit generates characteristic parameters of N paths (N is more than or equal to 1) of correction signals according to the input FTW and the stray signal characteristic information, and controls the signal detection and processing unit to detect signals. The stray correction signal generation unit carries out phase accumulation according to ftw parameters of the stray signals, the phase adjustment unit adjusts input of the phase amplitude conversion unit according to phases of input stray signals, the amplitude adjustment unit adjusts amplitude of correction signals according to amplitude of the input stray signals, and finally the signals needing to be corrected are output.
Optionally, the signal detection and processing unit module 16 includes a signal detection unit 21, a parameter extraction unit 22, and a signal processing unit 23, where the signal detection unit 16 is configured to detect a discrete signal, the parameter extraction unit 21 is configured to extract a characteristic value of an output target frequency, and the signal processing unit 23 is configured to screen a spurious signal to be processed, so as to implement adaptive extraction of spurious signal characteristics.
In a selectable scheme, the spur control unit module 17 includes a spur extraction unit 31, a feature analysis unit 32, and a parameter generation unit 33, where the spur extraction unit 31 is used for spur signal feature information, the feature analysis unit 32 is used for performing analysis and calculation according to the input FTW and the spur signal feature information, and the parameter generation unit 33 is used for generating a feature parameter of the N-way correction signal.
Optionally, the spur correction signal generating unit module 17 includes a phase adjusting unit 43 and an amplitude adjusting unit 43, where the phase adjusting unit 43 is configured to adjust an output phase of the correction signal, and after the phase amplitude conversion, the amplitude adjusting unit 43 adjusts an amplitude range of the correction signal.
Optionally, the radio frequency processing circuit includes a low-pass filter, a power amplifier, and two power dividers, where the low-pass filter is used to implement low-pass filtering of an output signal, the power amplifier is used to implement linear amplification, and the two power dividers are used to divide power to output.
A broadband signal generating method based on adaptive correction is characterized in that high-speed sampling is carried out on feedback of a DDS signal output end, the spurious extraction and characteristic analysis of broadband output signals are realized in a self-adaptive mode, the frequency, amplitude and phase information of spurious signals are obtained, N correction signals are output in an increased mode or parallel DACs are driven to output the N correction signals, correction signals with the same frequency, opposite phase and basically equal amplitude are generated, and spurious suppression is realized through synthesis of the output signals and the correction signals; wherein N is more than or equal to 1. The method comprises the following specific implementation steps:
step 1: through an input M-bit frequency control word FTW, accumulating through an N-bit phase accumulation unit, intercepting continuous amplitude information of a P-bit phase information driving phase amplitude conversion unit output signal, intercepting a D-bit amplitude driving DAC circuit to complete digital signal conversion into an analog signal output, and filtering, amplifying and power dividing by a radio frequency processing circuit to output a target frequency signal; wherein, the working clock fclkWith an output frequency of
Step 2: the radio frequency processing circuit outputs a signal to the ADC circuit, and the selection of the ADC circuit is matched with the bandwidth B of the output signalwAnd the dynamic range SFDR requirement, the ADC finishes the output signal foutOutputs a discrete digital signal s (n).
And step 3: realize the detection of discrete signals (such as detection after DFT conversion, etc.), extract and output the target frequency foutAccording to the spurious suppression requirement, acquiring spurious signals
Frequency, phase and amplitude parameters.
And 4, step 4: calculating ftw of the spurious signal according to the signal detection result and the frequency control word of the input signaliPhase thetaiAnd relative amplitude AiAnd the stray control unit selects a branch outputting a signal needing to be corrected according to requirements.
And 5: the spurious correction signal generation unit generates ftw from the inputiPerforming phase accumulation according to the phase thetaiThe output phase of the correction signal is adjusted (180 DEG out of phase), and after phase-amplitude conversion, amplitude range adjustment of the correction signal is completed by an amplitude adjustment unit.
Step 6: the main circuit output signal and the correction signal are synthesized before entering the DAC and are output by the DAC, or the signal synthesis can be completed after being output by a plurality of DACs.
And 7: and (5) changing the FTW, and repeating the steps 1 to 6 to realize the large dynamic output of the broadband signal.
Example 1
The advantages of the DDS are many, the application range is wide, but the DDS is limited by high spurs in broadband application, so that the conventional DDS cannot be directly used in the situation with high requirements on the spurious-free dynamic range. Therefore, the embodiment provides a spurious suppression method for a broadband signal generator, and the system is in a unified clock fclkDriven to work.
The D/A converter selects AD9739, f as shown in the schematic block diagrams of FIGS. 1-4clk1400MHz, N is 18, the first nyquist zone is selected for the DAC output, and the method of this embodiment includes:
step 1: randomly setting the output frequency 411MHz, FTW is 76958 by calculating the input frequency control word, passing through N-phase accumulation unit, truncating and looking up table to output amplitude information, outputting target frequency signal by high-speed driving DAC circuit, outputting signal frequency spectrum by radio frequency processing circuit as shown in FIG. 5, and measuring f in the frequency spectrumout411MHz, the maximum spur is 568MHz, and the signal-to-noise ratio is around 53 dBc.
Step 2: the radio frequency processing circuit divides one path of signal into an ADC circuit, and the ADC finishes outputting a signal foutThe sampling point number of the analog-to-digital conversion is 4096 points.
And step 3: adaptive signal detection is carried out by using 4096-point Discrete Fourier Transform (DFT), characteristic values of spurs in bandwidth of output signals are extracted, and spurs are obtained
Frequency, phase and amplitude parameters.
And 4, step 4: and calculating ftw, phase theta and relative amplitude A of the spurious signal according to the signal detection result and the frequency control word of the input signal, and driving the correction signal to generate by the spurious control unit.
And 5: the spurious correction signal generation unit carries out phase accumulation according to the input ftw, adjusts the output phase (180 degrees of phase reversal) of the correction signal according to the phase theta, and completes the amplitude range adjustment of the correction signal through the amplitude adjustment unit after phase amplitude conversion.
Step 6: the main path output signal and the correction signal are synthesized and then output by the DAC, the frequency spectrum of the output signal after low-pass filtering is shown in figure 6, and the signal output quality is obviously improved after the method is adopted.
And repeating the steps to adaptively finish the extraction of the spurious characteristics and the generation of the correction signal in any output signal bandwidth, thereby realizing the large dynamic broadband signal generator.
The functionality of the present invention, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
Claims (10)
1. An apparatus for generating a wideband signal based on adaptive correction, comprising:
the system comprises a phase accumulation unit module, a phase amplitude conversion unit module, a DAC circuit module, a radio frequency processing circuit module, an ADC circuit module, a signal detection and processing unit module, a stray control unit module and a stray correction signal generation unit module;
the phase accumulation unit module obtains an N-bit continuous digital phase value through accumulation of an input M-bit frequency control word FTW, intercepts P-bit phase information for driving continuous amplitude information of an output signal of the phase amplitude conversion unit module, intercepts D-bit amplitude for driving the DAC circuit module to complete digital signal conversion into an analog signal and output the analog signal to the radio frequency processing circuit module, outputs a target frequency signal to the ADC circuit module by the radio frequency processing circuit module, outputs the target frequency signal to the signal detection and processing unit module by the ADC circuit module for signal detection and processing, then adaptively outputs stray signal characteristic information of a detection signal to the stray control unit module, and generates characteristic parameters of an N-path correction signal by the stray control unit module according to the input FTW and the stray signal characteristic information, n is more than or equal to 1;
the stray signal correction signal generation unit module performs phase accumulation according to FTW parameters of stray signals, adjusts the input of the phase amplitude conversion unit module according to the phase of input stray signals, and adjusts the amplitude of correction signals according to the amplitude of input stray signals, so as to finally output required correction signals; the main circuit output signal and the correction signal are synthesized before entering the DAC circuit module and are output by the DAC circuit module, or the signal synthesis is completed after the signals are output by the DAC circuit modules.
2. The apparatus according to claim 1, wherein the signal detection and processing unit module includes a signal detection unit, a parameter extraction unit, and a signal processing unit, the signal detection unit is configured to detect a discrete signal, the parameter extraction unit is configured to extract a characteristic value of an output target frequency, and the signal processing unit is configured to filter a spurious signal to be processed, so as to achieve adaptive extraction of spurious signal characteristics.
3. The adaptive correction-based broadband signal generation device according to claim 1, wherein the spur control unit module includes a spur extraction unit, a feature analysis unit and a parameter generation unit, the spur extraction unit is used for extracting characteristic information of a spur signal, the feature analysis unit is used for performing analysis and calculation according to an input FTW and the characteristic information of the spur signal, and the parameter generation unit is used for generating characteristic parameters of the N-path correction signal.
4. The apparatus according to claim 1, wherein the spur correction signal generating unit module comprises a phase adjusting unit and an amplitude adjusting unit, the phase adjusting unit is configured to adjust an output phase of the correction signal, and after the phase amplitude conversion, an amplitude range of the correction signal is adjusted by the amplitude adjusting unit.
5. The apparatus according to any one of claims 1 to 4, wherein the radio frequency processing circuit includes a low pass filter, a power amplifier, and a two-way power divider, the low pass filter is configured to implement low pass filtering of the output signal, the power amplifier is configured to implement linear amplification, and the two-way power divider is configured to divide the output power.
6. A broadband signal generating method based on self-adaptive correction is characterized in that high-speed sampling is carried out at the output end of a DDS signal in a feedback mode, the stray extraction and characteristic analysis of broadband output signals are achieved in a self-adaptive mode, the frequency, amplitude and phase information of the stray signals are obtained, N correction signals are output in an increased mode or parallel DACs are driven to output the N correction signals in a signal generating structure, correction signals with the same frequency, opposite phase and basically the same amplitude are generated, and stray suppression is achieved through synthesis of the output signals and the correction signals; wherein N is more than or equal to 1.
7. The adaptive correction-based wideband signal generating method according to claim 6, comprising:
step 1, accumulating through an N-phase accumulation unit by an input M-bit frequency control word FTW, intercepting continuous amplitude information of a signal output by a P-phase information driving phase amplitude conversion unit, intercepting continuous amplitude information of a signal output by a D-phase amplitude driving DAC circuit, and converting a digital signal into an analog signal and outputting the analog signal to a radio frequency processing circuit module;
step 2, the radio frequency processing circuit outputs a path of signal to the ADC circuit module, and the bandwidth B matched with the output signal is selected through the ADC circuit modulewAnd the target frequency f is output by the ADC circuit module according to the requirements of the dynamic range SFDRoutThe discrete digital signal s (n) is output;
step 3, detecting the discrete signal and extracting and outputting the target frequency foutCharacteristic value of, acquiring a spur signal according to a spur suppression requirement
Frequency, phase and amplitude parameters of;
step 4, calculating FTW of the spurious signal according to the signal detection result in the step 3 and the frequency control word FTW of the input signaliPhase thetaiAnd relative amplitude AiThe stray control unit module according toThe branch which outputs the signal to be corrected is required to be selected;
step 5, the stray correction signal generation unit module generates ftw according to the inputiPerforming phase accumulation according to the phase thetaiAdjusting the output phase of the correction signal, and completing the amplitude range adjustment of the correction signal by an amplitude adjustment unit after phase amplitude conversion;
and 6, synthesizing the main circuit output signal and the correction signal before entering the DAC circuit module, and outputting the synthesized signals by the DAC circuit module, or synthesizing the signals after outputting the synthesized signals by a plurality of DAC circuit modules.
8. The adaptive correction based wideband signal generating method according to claim 7, comprising: and 7, changing the FTW, and repeating the steps 1 to 6 to realize large dynamic output of the broadband signal.
9. The adaptive correction-based wideband signal generating method according to claim 7, wherein in step 1, the operation clock fclkWith an output frequency of
10. The adaptive correction-based wideband signal generating method according to claim 7, wherein in step 3, discrete signals are detected after DFT conversion.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113253190A (en) * | 2021-04-22 | 2021-08-13 | 中国电子科技集团公司第二十九研究所 | Method for correcting full-band amplitude of radio frequency channel of distributed system |
| CN113517888A (en) * | 2021-04-21 | 2021-10-19 | 中科亿海微电子科技（苏州）有限公司 | Circuit device and method for synthesizing arbitrary waveform with optimized spectral purity |
| CN113985361A (en) * | 2021-10-21 | 2022-01-28 | 中国船舶重工集团公司第七二三研究所 | System and method for improving frequency spectrum quality of DDS output signal |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102324933A (en) * | 2011-06-21 | 2012-01-18 | 中国兵器工业第二○六研究所 | Orthogonal low-spurious direct digital frequency synthesizer |
| CN105141560A (en) * | 2015-07-16 | 2015-12-09 | 中国电子科技集团公司第四十一研究所 | Multisystem signal simulation device and method |
| CN106383548A (en) * | 2016-11-14 | 2017-02-08 | 成都西蒙电子技术有限公司 | Low-spur DDS (Direct Digital Synthesizer) source and method for reducing spur of DDS source |
-
2020
- 2020-08-19 CN CN202010838456.0A patent/CN112073064B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102324933A (en) * | 2011-06-21 | 2012-01-18 | 中国兵器工业第二○六研究所 | Orthogonal low-spurious direct digital frequency synthesizer |
| CN105141560A (en) * | 2015-07-16 | 2015-12-09 | 中国电子科技集团公司第四十一研究所 | Multisystem signal simulation device and method |
| CN106383548A (en) * | 2016-11-14 | 2017-02-08 | 成都西蒙电子技术有限公司 | Low-spur DDS (Direct Digital Synthesizer) source and method for reducing spur of DDS source |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113517888A (en) * | 2021-04-21 | 2021-10-19 | 中科亿海微电子科技（苏州）有限公司 | Circuit device and method for synthesizing arbitrary waveform with optimized spectral purity |
| CN113253190A (en) * | 2021-04-22 | 2021-08-13 | 中国电子科技集团公司第二十九研究所 | Method for correcting full-band amplitude of radio frequency channel of distributed system |
| CN113985361A (en) * | 2021-10-21 | 2022-01-28 | 中国船舶重工集团公司第七二三研究所 | System and method for improving frequency spectrum quality of DDS output signal |
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