CN116449099B - Spectrum analysis circuit - Google Patents
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- CN116449099B CN116449099B CN202310258960.7A CN202310258960A CN116449099B CN 116449099 B CN116449099 B CN 116449099B CN 202310258960 A CN202310258960 A CN 202310258960A CN 116449099 B CN116449099 B CN 116449099B
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- 238000010183 spectrum analysis Methods 0.000 title claims abstract description 70
- 238000005070 sampling Methods 0.000 claims abstract description 207
- 238000007781 pre-processing Methods 0.000 claims abstract description 24
- 238000004364 calculation method Methods 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims description 19
- 238000001228 spectrum Methods 0.000 claims description 11
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- 101000827746 Homo sapiens Fibroblast growth factor receptor 1 Proteins 0.000 description 24
- 101000932478 Homo sapiens Receptor-type tyrosine-protein kinase FLT3 Proteins 0.000 description 22
- 102100020718 Receptor-type tyrosine-protein kinase FLT3 Human genes 0.000 description 22
- 101100434411 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) ADH1 gene Proteins 0.000 description 15
- 101150102866 adc1 gene Proteins 0.000 description 15
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- 101100162020 Mesorhizobium japonicum (strain LMG 29417 / CECT 9101 / MAFF 303099) adc3 gene Proteins 0.000 description 10
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- 101000797092 Mesorhizobium japonicum (strain LMG 29417 / CECT 9101 / MAFF 303099) Probable acetoacetate decarboxylase 3 Proteins 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The application discloses a spectrum analysis circuit, and the application belongs to the technical field of spectrum analysis. The circuit comprises: the preprocessing module is connected with the signal receiving end and is used for preprocessing the received signal; the power distribution module is connected with the preprocessing module and used for distributing signals to three frequency selection channels; the three frequency selection channels are set as follows: the first frequency selecting channel comprises a filter bank, a differential signal converter and a sampling element; the second frequency selecting channel comprises a filter bank, a differential signal converter and a sampling element; the third frequency selecting channel comprises a filter bank, a differential signal converter and a sampling element; the three frequency selection channels are used for obtaining three frequency band continuous sampling results in a preset range through gating and sampling; and the calculation module is connected with the output ends of the three frequency selection channels and is used for carrying out the combination calculation of the sampling results. According to the technical scheme, the frequency spectrum analysis bandwidth of the input signal can be widened, and the accuracy of the frequency spectrum analysis result is improved.
Description
Technical Field
The application belongs to the technical field of spectrum analysis, and particularly relates to a spectrum analysis circuit.
Background
With the increasing application fields of wireless signals, it is becoming more and more important to restore and analyze signals received by users more accurately, and it is becoming more and more common to measure parameters such as distortion degree, modulation degree, spectral purity, frequency stability, intermodulation distortion, etc. of signals and analyze the frequency spectrum of signal bands by using a spectrum analyzer.
The current circuit used when the spectrum analyzer is used for carrying out spectrum analysis on an input signal mainly uses the combination of a sweep frequency local oscillator and a multi-stage mixer to move the frequency band of the input signal, and meanwhile, the multi-stage filter is combined to realize the selection of the frequency band of the signal, and then the sampling element ADC is used for sampling and analyzing the selected frequency band.
Because standing-wave ratio and amplitude-frequency characteristics of the mixer are poor, the amplitude-frequency characteristics of the whole circuit are poor, and the mixer can generate multiple harmonic components related to an input signal and a local oscillator signal in the mixing process to interfere a signal analysis result, the spectrum analysis circuit in the prior art can cause the problem of inaccurate spectrum analysis result. Meanwhile, in the prior art, only a primary ADC sampling element is adopted to sample and analyze the frequency-selected input signal, so that the frequency spectrum analysis bandwidth of the input signal is limited.
Disclosure of Invention
The embodiment of the application aims to provide a spectrum analysis circuit, which solves the problems of inaccurate spectrum analysis results and limited spectrum analysis bandwidth in the prior art, can avoid harmonic component interference generated by using a mixer, and widens the spectrum analysis bandwidth.
The embodiment of the application provides a spectrum analysis circuit, which comprises:
the input end of the preprocessing module is connected with the signal receiving end and is used for preprocessing the received signal;
the power distribution module is connected with the preprocessing module and used for distributing signals to three frequency selection channels; the three frequency selection channels are set as follows:
a first frequency selective channel comprising a first filter bank, a first differential signal converter and a first ADC sampling element;
the second frequency selecting channel comprises a second filter bank, a second differential signal converter and a second ADC sampling element;
the third frequency selecting channel comprises a third filter bank, a third differential signal converter and a third ADC sampling element;
the first filter bank, the second filter bank and the third filter bank respectively comprise at least two filters, and the at least two filters are connected through a gating switch;
the first frequency selecting channel, the second frequency selecting channel and the third frequency selecting channel are used for obtaining three continuous frequency band sampling results in a preset range through gating and sampling;
and the input end of the calculation module is connected with the output ends of the three frequency selection channels and is used for carrying out combination calculation on sampling results so as to obtain a spectrum analysis result of the received signals in the preset range.
Further, the first ADC sampling element and the second ADC sampling element are set to a first sampling frequency;
the third ADC sampling element is set to a second sampling frequency.
Further, the first filter bank is composed of N filters, wherein the band pass frequency band of each filter is: BW (BW);
where bw=fs×p, fs is the first sampling frequency,
the second filter bank is composed of M filters, wherein the passband frequency band of each filter is: BW (BW);
where bw=fs×p, fs is the first sampling frequency,
the third filter bank is composed of K filters, wherein the passband frequency band of each filter is: BWB;
wherein bwb= FsB ×p and FsB =fsx2k/2k+1, fsb is the second sampling frequency,
further, the filters in the first filter bank, the second filter bank and the third filter bank are respectively connected in an associated mode to obtain at least two access modes.
Further, the band pass frequency bands of the N filters in the first filter bank are respectively:
[4×(n-1)+1]×Fs/4±BW/2；
the nyquist sampling intervals of the first ADC sampling elements where the respective filters in the first filter bank are located are respectively:
x＝2×N-1；
wherein n is E [1, N]The method comprises the steps of carrying out a first treatment on the surface of the Bw=fs×p, fs is the first sampling frequency,x is the nyquist sampling interval of the first ADC sampling element.
Further, the band pass frequency bands of the M filters in the second filter bank are respectively:
[4×(m-1)+3]×Fs/4±BW/2；
the nyquist sampling intervals of the second ADC sampling elements where the respective filters in the second filter bank are located are respectively:
y＝2×M；
wherein m is E [1, M]The method comprises the steps of carrying out a first treatment on the surface of the Bw=fs×p, fs is the first sampling frequency,y is the nyquist sampling interval of the second ADC sampling element.
Further, band pass frequency bands of the K filters in the third filter group are respectively:
k×Fs/2±BWB/2；
the nyquist sampling intervals of the third ADC sampling elements where the respective filters in the third filter bank are located are respectively:
z＝K+1；
wherein k is [1, K ]]The method comprises the steps of carrying out a first treatment on the surface of the Bwb= FsB ×p, and FsB =fsx2k/2k+1, fsb is the second sampling frequency,z is the nyquist sampling interval of the third ADC sampling element.
Further, when the i-th mode is adopted for access,
the filter access sequence of the first filter bank is as follows: n=i// 2+1;
the filter access sequence of the second filter bank is as follows: m= (i-1)// 2+1;
the filter access sequence of the third filter bank is as follows: k=i;
where i is the filter access order of the third filter bank and/is the division round calculation.
Further, the computing module is specifically configured to:
acquiring nyquist sampling intervals of the first, second and third ADC sampling elements where band-pass frequency bands of the first, second and third filter banks are respectively;
respectively carrying out spectrum analysis on continuous sampling results of three frequency bands in the preset range according to the Nyquist sampling interval so as to obtain real spectrums of all the frequency bands;
and splicing the real spectrums of the frequency bands to obtain a spectrum analysis result of the received signals in the preset range.
In the embodiment of the application, the input end of the preprocessing module is connected with the signal receiving end and is used for preprocessing the received signal; the power distribution module is connected with the preprocessing module and used for distributing signals to three frequency selection channels; the three frequency selection channels are set as follows: a first frequency selective channel comprising a first filter bank, a first differential signal converter and a first ADC sampling element; the second frequency selecting channel comprises a second filter bank, a second differential signal converter and a second ADC sampling element; the third frequency selecting channel comprises a third filter bank, a third differential signal converter and a third ADC sampling element; the first filter bank, the second filter bank and the third filter bank respectively comprise at least two filters, and the at least two filters are connected through a gating switch; the first frequency selecting channel, the second frequency selecting channel and the third frequency selecting channel are used for obtaining three continuous frequency band sampling results in a preset range through gating and sampling; and the input end of the calculation module is connected with the output ends of the three frequency selection channels and is used for carrying out the combination calculation of the sampling results. According to the spectrum analysis circuit, the problems that in the prior art, a spectrum analysis result is not accurate enough and the spectrum analysis bandwidth is limited are solved, by arranging a plurality of filter banks and gating different frequency band ranges in each filter bank, the frequency selection of an input signal can be realized, and meanwhile, a plurality of ADC sampling elements are adopted to sample and splice the frequency selection result, so that the purpose of spectrum analysis can be achieved without a mixer, harmonic component interference caused by the use of the mixer is avoided, and the bandwidth of spectrum analysis is widened.
Drawings
Fig. 1 is a schematic diagram of a spectrum analysis circuit according to an embodiment of the present application;
fig. 2 is a schematic diagram of a spectrum analysis circuit according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the following detailed description of specific embodiments thereof is given with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the application and not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the matters related to the present application are shown in the accompanying drawings. Before discussing exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart depicts operations (or steps) as a sequential process, many of the operations can be performed in parallel, concurrently, or at the same time. Furthermore, the order of the operations may be rearranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figures. The processes may correspond to methods, functions, procedures, subroutines, and the like.
Technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application are within the scope of the protection of the present application.
The terms first, second and the like in the description and in the claims, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present application may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type and not limited to the number of objects, e.g., the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.
The spectrum analysis circuit, the security chip device, the equipment and the medium provided by the embodiment of the application are described in detail below through specific embodiments and application scenes thereof with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a spectrum analysis circuit according to an embodiment of the present application. As shown in fig. 1, the method specifically includes the following steps:
the preprocessing module 101, the input end of the preprocessing module 101 is connected with the signal receiving end, and is used for preprocessing the received signal;
the power distribution module 102 is connected with the preprocessing module 101 and is used for distributing signals to three frequency selection channels; the three frequency selection channels are set as follows:
a first frequency-selective channel 103 including a first filter bank FLT1, a first differential signal converter X1 and a first ADC sampling element ADC1;
a second frequency selective channel 104 including a second filter bank FLT2, a second differential signal converter X2 and a second ADC sampling element ADC2;
a third frequency-selective channel 105 including a third filter bank FLT3, a third differential signal converter X3 and a third ADC sampling element ADC3;
the first filter bank FLT1, the second filter bank FLT2 and the third filter bank FLT3 respectively comprise at least two filters, and the at least two filters are connected through a gating switch;
the first frequency selecting channel 103, the second frequency selecting channel 104 and the third frequency selecting channel 105 are used for obtaining three continuous frequency band sampling results in a preset range through gating and sampling;
and the input end of the calculation module 106 is connected with the output ends of the three frequency selection channels, and is used for carrying out combination calculation on sampling results so as to obtain a spectrum analysis result of the received signals in the preset range.
Fig. 2 is a schematic diagram of a spectrum analysis circuit according to an embodiment of the present application. As shown in fig. 2, in an embodiment, the input terminal of the preprocessing module 101 is connected to the signal receiving terminal, and includes a programmable attenuation network ATT1 and an amplifier OP1, where the programmable attenuation network ATT1 is connected to the amplifier OP 1. The preprocessing module 101 can preprocess the input signal received by the signal receiving end, including power attenuation of the received high-power signal by the programmable attenuation network ATT1 to protect the circuit, and power amplification of the received low-power signal by the amplifier OP3 to improve the sensitivity of the whole machine.
In an embodiment, the input end of the power distribution module 102 is connected to the output end of the preprocessing module 101, and includes a power divider PD, an amplifier OP2, an amplifier OP3, and an amplifier OP4, which are configured to distribute the input signal processed by the preprocessing module 101 into three paths and transmit the three paths to three different frequency-selecting channels respectively. The inputs of the amplifiers OP2, OP3 and OP4 are connected to three different output ports of the power divider PD, respectively. The power divider PD is configured to divide the signal processed by the preprocessing module 101 into three signals with equal power, and input the signals into the amplifiers respectively, and the amplifiers OP2, OP3, and OP4 are configured to amplify and output the three signals output by the power divider PD respectively.
In one embodiment, the three frequency selective channels include a first frequency selective channel 103, a second frequency selective channel 104, and a third frequency selective channel 105. The input end of the first frequency selecting channel 103 is connected to the output end of the amplifier OP2 in the power distribution module 102, and includes a first filter bank FLT1, a first differential signal converter X1 and a first ADC sampling element ADC1, which are configured to select and sample the frequency of the output signal of the amplifier OP 2. The output end of the first filter bank FLT1 is connected with the input end of the amplifier OP2, the first filter bank FLT1 comprises at least two filters, the at least two filters are connected into one filter through a gating switch, and different filters are provided with different passband frequency bands and are used for selecting frequencies of output signals of the amplifier OP 2. The input end of the first differential signal converter X1 is connected with the output end of the first filter bank FLT1, and is used for converting the single-ended input signal gated by the first filter bank FLT1 into a differential input signal, so that the anti-interference capability of the signal is improved. An input terminal of the first ADC sampling element ADC1 is connected to an output terminal of the first differential signal converter X1, and is configured to sample an input signal gated by the first filter bank FLT 1.
In an embodiment, the input end of the second frequency selecting channel 104 is connected to the output end of the amplifier OP3 in the power distribution module 102, and includes a second filter bank FLT2, a second differential signal converter X2, and a second ADC sampling element ADC2, which are configured to select and sample the frequency of the output signal of the amplifier OP 3. The output end of the second filter bank FLT2 is connected with the input end of the amplifier OP3, and includes at least two filters, and at least two filters are connected into one of them through a gating switch, and different filters are provided with different passband frequency bands, and are used for selecting frequencies of output signals of the amplifier OP 3. The input end of the second differential signal converter X2 is connected to the output end of the second filter bank FLT2, and is configured to convert the single-ended input signal gated by the second filter bank FLT2 into a differential input signal, so as to improve the anti-interference capability of the signal. An input terminal of the second ADC sampling element ADC2 is connected to an output terminal of the second differential signal converter X2, and is configured to sample the input signal gated by the second filter bank FLT 2.
In an embodiment, the input end of the third frequency selecting channel 105 is connected to the output end of the amplifier OP4 in the power distribution module 102, and includes a third filter bank FLT3, a third differential signal converter X3, and a third ADC sampling element ADC3, which are configured to select and sample the frequency of the output signal of the amplifier OP 4. The output end of the third filter bank FLT3 is connected with the input end of the amplifier OP4, and includes at least two filters, and at least two filters are connected to one of them through a gating switch, and different filters are provided with different passband frequency bands, and are used for selecting frequencies of output signals of the amplifier OP 4. The input end of the third differential signal converter X3 is connected to the output end of the third filter bank FLT3, and is configured to convert the single-ended input signal gated by the third filter bank FLT3 into a differential input signal, so as to improve the anti-interference capability of the signal. An input terminal of the third ADC sampling element ADC3 is connected to an output terminal of the third differential signal converter X3, for sampling the input signal gated by the third filter bank FLT 3.
In an embodiment, the first frequency selecting channel 103, the second frequency selecting channel 104 and the third frequency selecting channel 105 are used for gating and sampling the frequency band of the input signal distributed by the power distribution module 102. The frequency band range of the spectrum analysis can be preset according to the spectrum analysis requirement, three continuous frequency bands in the preset range can be obtained by setting different gating frequency bands for filters in different frequency selection channels, and then the input signals of the three frequency bands are sampled by the ADC sampling element so as to obtain a frequency band sampling result in the preset range.
In an embodiment, the computing module 106 is provided with at least three input ports, and the at least three input ports are respectively connected with output ends of the three frequency selection channels, and are used for performing spectrum analysis on the frequency selection and sampling results of the first frequency selection channel 103, the second frequency selection channel 104 and the third frequency selection channel 105. Since the frequency selection intervals of the first frequency selection channel 103, the second frequency selection channel 104 and the third frequency selection channel 105 are different, and the sampling frequencies of the first ADC sampling element ADC1, the second ADC sampling element ADC2 and the third ADC sampling element ADC3 are not identical, the nyquist sampling intervals of the ADC sampling elements where the sampling results are respectively located are also different. The calculation module 106 performs spectrum analysis on the sampling results according to the nyquist sampling interval of the ADC sampling element where the sampling results of the first frequency selecting channel 103, the second frequency selecting channel 104 and the third frequency selecting channel 105 correspond, and performs merging processing on the spectrum analysis results to obtain a spectrum analysis result of the received signal in a preset range.
In an embodiment, by using the corresponding combination of the multiple filters and the multiple ADC sampling elements, the input signal after frequency selection may be sampled, so as to achieve the purpose of directly collecting the signal exceeding Fs/2 without using a mixer, avoid interference of harmonic components generated by the mixer on the spectrum analysis result of the input signal, and the signal bandwidth may reach the analog bandwidth of the ADC sampling elements without being limited by the sampling rate, and widen the spectrum analysis bandwidth.
Further, the computing module 106 is specifically configured to:
acquiring nyquist sampling intervals of the first ADC sampling element ADC1, the second ADC sampling element ADC2 and the third ADC sampling element ADC3, in which band-pass frequency bands of the first filter bank FLT1, the second filter bank FLT2 and the third filter bank FLT3 are respectively located;
respectively carrying out spectrum analysis on continuous sampling results of three frequency bands in the preset range according to the Nyquist sampling interval so as to obtain real spectrums of all the frequency bands;
and splicing the real spectrums of the frequency bands to obtain a spectrum analysis result of the received signals in the preset range.
In an embodiment, the nyquist sampling interval of the ADC where the band-pass frequency band is located is determined according to the band-pass frequency band of the first filter bank FLT1, the second filter bank FLT2, and the third filter bank FLT3 and the sampling frequencies of the first ADC sampling element ADC1, the second ADC sampling element ADC2, and the third ADC sampling element ADC 3. For example: the frequency range of the first filter bank FLT1 is Fs/4+/-BW/2, the frequency range of the second filter bank FLT2 is 3 Fs/4+/-BW/2, and if the sampling frequencies of the first ADC sampling element ADC1 and the second ADC sampling element ADC2 are Fs, the frequency range of the first filter bank FLT1 is in a first Nyquist sampling interval of the first ADC sampling element ADC1 at the moment, and the frequency range of the second filter bank FLT2 is in a second Nyquist sampling interval of the second ADC sampling element ADC 2.
Because the calculation modes of the spectrum analysis on the sampling results of different nyquist sampling intervals are different, the spectrum analysis is performed on the sampling results of the first ADC sampling element ADC1, the second ADC sampling element ADC2 and the third ADC sampling element ADC3 according to the nyquist sampling intervals of the ADC, so as to obtain the real spectrum of each frequency band. On the basis of the above example, since the frequency band range of the first filter bank FLT1 is in the first nyquist sampling interval of the first ADC sampling element ADC1, the sampling result of the ADC1 is directly calculated by FFT to obtain a real spectrum analysis result of the frequency band range of FLT 1; because the frequency range of the second filter bank FLT2 is in the second Nyquist sampling interval of the second ADC sampling element ADC2, fs-FFT calculation is adopted on the sampling result of the ADC2 to obtain a real spectrum analysis result of the frequency range of the FLT 2. And respectively analyzing and calculating the real spectrums of the band-pass frequency bands of the first filter bank FLT1, the second filter bank FLT2 and the third filter bank FLT3, and splicing the analysis and calculation results to obtain the spectrum analysis result of the received signals in the preset range.
According to the Nyquist sampling interval of the ADC where the band-pass frequency band of the filter bank is located, spectrum analysis is carried out on sampling results of the band-pass frequency band respectively, and analysis results are spliced, so that reliability and simplicity of spectrum analysis of each frequency band can be improved.
Further, the first ADC sampling element ADC1 and the second ADC sampling element ADC2 are set to a first sampling frequency;
the third ADC sampling element ADC3 is set to a second sampling frequency.
In an embodiment, the first ADC sampling element ADC1 and the second ADC sampling element ADC2 may be set to a first sampling frequency, and the third ADC sampling element ADC3 may be set to a second sampling frequency. That is, the sampling frequencies of the first ADC sampling element ADC1 and the second ADC sampling element ADC2 are the same, and the sampling frequency of the third ADC sampling element ADC3 is different from the sampling frequencies of the first ADC sampling element ADC1 and the second ADC sampling element ADC2, so as to obtain continuous sampling results of three frequency bands within a preset range.
Further, the first filter bank FLT1 is composed of N filters, where the band pass frequency band of each filter is: BW (BW);
where bw=fs×p, fs is the first sampling frequency,
the second filter bank FLT2 is composed of M filters, where the band pass frequency band of each filter is: BW (BW);
where bw=fs×p, fs is the first sampling frequency,
the third filter bank FLT3 is composed of K filters, where the band pass frequency band of each filter is: BWB;
wherein bwb= FsB ×p and FsB =fsx2k/2k+1, fsb is the second sampling frequency,
in one embodiment, the purpose of performing each band gating on the input signal can be achieved by setting different band pass bands for different filters in the three filter banks. One of the band-pass frequency bands of the first filter bank FLT1 and the second filter bank FLT2 is a starting frequency band of a preset range, and the other band is a terminating frequency band. Since the band pass band of each filter is BW, which is used to determine the band sampling range of the input signal, and bw=fs×p, the value range of p is set to beSo that the band pass frequency bands of the first filter bank FLT1 and the second filter bank FLT2 can fall within the complete nyquist sampling interval of the first sampling frequency. Setting the band pass frequency band of the third filter bank FLT3 to BWB for supplementing the band portion of the cross-domain first sampling frequency nyquist sampling interval between the band pass frequency bands of the first filter bank FLT1 and the second filter bank FLT2, and bwb= FsB ×p, setting the second sampling frequency of the third ADC sampling element ADC3 to FsB =fs× 2k/2k+1 for facilitating the calculation so that the band pass frequency band of the third filter bank FLT3 may fall on the secondA complete nyquist sampling interval of the sampling frequency. By setting the band-pass frequency band of each filter in the first filter bank FLT1 and the second filter bank FLT2 as BW and setting the band-pass frequency band of each filter in the third filter bank FLT3 as BWB for supplementing the frequency band of the cross-domain nyquist sampling interval, the maximum analysis bandwidth of the single spectrum analysis can be widened.
Further, the filters in the first filter bank FLT1, the second filter bank FLT2 and the third filter bank FLT3 are respectively connected in an associated manner, so as to obtain at least two connection modes.
In an embodiment, the band pass frequency range of the filter of the access circuit in the other two filter banks can be determined by determining the band pass frequency range of the filter of one access circuit in the first filter bank FLT1, the second filter bank FLT2 and the third filter bank FLT3 and a preset range. The three band-pass frequency ranges are different frequency ranges and may have overlapping portions, and at the same time, the three band-pass frequency ranges may be superimposed into a continuous band-pass frequency range. Since each filter bank comprises a plurality of filters with different frequency bands, the mode of accessing the filters with different frequency bands in at least two filter banks in a preset range can be adopted. The filters in the first filter bank FLT1, the second filter bank FLT2 and the third filter bank FLT3 are respectively connected in an associated mode, the purpose of complementation of Nyquist sampling intervals is achieved, and band-pass frequency bands of the three filters are further connected in series to widen the spectrum analysis bandwidth.
Further, the band pass frequency bands of the N filters in the first filter bank are respectively:
[4×(n-1)+1]×Fs/4±BW/2；
the nyquist sampling intervals of the first ADC sampling elements where the respective filters in the first filter bank are located are respectively:
x＝2×N-1；
wherein n is E [1, N]The method comprises the steps of carrying out a first treatment on the surface of the Bw=fs×p, fs is the first sampling frequency,x is the nyquist sampling interval of the first ADC sampling element.
Further, the band pass frequency bands of the M filters in the second filter bank are respectively:
[4×(m-1)+3]×Fs/4±BW/2；
the nyquist sampling intervals of the second ADC sampling elements where the respective filters in the second filter bank are located are respectively:
y＝2×M；
wherein m is E [1, M]The method comprises the steps of carrying out a first treatment on the surface of the Bw=fs×p, fs is the first sampling frequency,y is the nyquist sampling interval of the second ADC sampling element.
Further, band pass frequency bands of the K filters in the third filter group are respectively:
k×Fs/2±BWB/2；
the nyquist sampling intervals of the third ADC sampling elements where the respective filters in the third filter bank are located are respectively:
z＝K+1；
wherein k is [1, K ]]The method comprises the steps of carrying out a first treatment on the surface of the Bwb= FsB ×p, and FsB =fsx2k/2k+1, fsb is the second sampling frequency,z is the nyquist sampling interval of the third ADC sampling element.
In an embodiment, the filters in each filter bank are sequentially switched in, and different filters are switched in such a way that the band pass frequency ranges of each filter bank are different. The bandpass frequency bands of the N filters in the first filter bank FLT1 are different from the center frequency points of the bandpass frequency bands of the M filters in the second filter bank FLT2, have the same bandwidth, are used for determining a start frequency band range and a stop frequency band range of the band sampling, the bandpass frequency bands of the K filters in the third filter bank FLT3 are used for supplementing the frequency band range of the nyquist sampling interval of the cross-domain first sampling frequency in the bandpass frequency band ranges of the filters in the first filter bank FLT1 and the second filter bank FLT2, and the bandpass frequency band range of the filters in the third filter bank FLT3 has an overlapping portion with the bandpass frequency band ranges of the filters in the first filter bank FLT1 and the second filter bank FLT 2. By setting different frequency ranges for each filter in each filter bank, the spectrum analysis bandwidth can be widened, and the combined bandwidths of the three filter banks can ensure that any center frequency point has at least the analysis bandwidth of BW. By determining the nyquist sampling interval of the ADC in which each filter in each filter bank is located, the reliability of spectrum analysis and the efficiency of spectrum analysis on the passband bandwidth of each filter bank can be improved.
Further, when the i-th mode is adopted for access,
the filter access sequence of the first filter bank FLT1 is: n=i// 2+1;
the filter access sequence of the second filter bank FLT2 is: m= (i-1)// 2+1;
the filter access sequence of the third filter bank FLT3 is: k=i;
where i is the filter access order of the third filter bank FLT3,// is the division round calculation.
In an embodiment, when the filter access sequence of the third filter bank FLT3 is i, that is, when the ith filter in the third filter bank FLT3 is accessed, the filter access sequence of the first filter bank FLT1 is n=i// 2+1; the filter access order of the second filter bank FLT2 is m= (i-1)// 2+1. Where// is a division integer calculation, N is the nth filter that is coupled to the first filter bank FLT1, and M is the mth filter that is coupled to the second filter bank FLT 2.
According to the technical scheme provided by the embodiment of the application, the input end of the preprocessing module is connected with the signal receiving end and is used for preprocessing the received signal; the power distribution module is connected with the preprocessing module and used for distributing signals to three frequency selection channels; the three frequency selection channels are set as follows: a first frequency selective channel comprising a first filter bank, a first differential signal converter and a first ADC sampling element; the second frequency selecting channel comprises a second filter bank, a second differential signal converter and a second ADC sampling element; the third frequency selecting channel comprises a third filter bank, a third differential signal converter and a third ADC sampling element; the first filter bank, the second filter bank and the third filter bank respectively comprise at least two filters, and the at least two filters are connected through a gating switch; the first frequency selecting channel, the second frequency selecting channel and the third frequency selecting channel are used for obtaining three continuous frequency band sampling results in a preset range through gating and sampling; and the input end of the calculation module is connected with the output ends of the three frequency selection channels and is used for carrying out the combination calculation of the sampling results. According to the spectrum analysis circuit, the problems that in the prior art, a spectrum analysis result is not accurate enough and the spectrum analysis bandwidth is limited are solved, by arranging a plurality of filter banks and gating different frequency band ranges in each filter bank, the frequency selection of an input signal can be realized, and meanwhile, a plurality of ADC sampling elements are adopted to sample and splice the frequency selection result, so that the purpose of spectrum analysis can be achieved without a mixer, harmonic component interference caused by the use of the mixer is avoided, and the bandwidth of spectrum analysis is widened.
The foregoing description is only of the preferred embodiments of the present application and the technical principles employed. The present application is not limited to the specific embodiments described herein, but is capable of numerous obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the present application. Therefore, while the present application has been described in connection with the above embodiments, the present application is not limited to the above embodiments, but may include many other equivalent embodiments without departing from the spirit of the present application, and the scope of the present application is determined by the scope of the claims.
Claims (8)
1. A spectrum analysis circuit, the spectrum analysis circuit comprising:
the input end of the preprocessing module is connected with the signal receiving end and is used for preprocessing the received signal;
the power distribution module is connected with the preprocessing module and used for distributing signals to three frequency selection channels; the three frequency selection channels are set as follows:
a first frequency selective channel comprising a first filter bank, a first differential signal converter and a first ADC sampling element;
the second frequency selecting channel comprises a second filter bank, a second differential signal converter and a second ADC sampling element;
the third frequency selecting channel comprises a third filter bank, a third differential signal converter and a third ADC sampling element;
the first filter bank, the second filter bank and the third filter bank respectively comprise at least two filters, and the at least two filters are connected into one filter through a gating switch;
the filters in the first filter bank, the second filter bank and the third filter bank are respectively connected in an associated mode according to the band-pass frequency range and the preset range to obtain at least two connection modes; the three band-pass frequency ranges of the filters after the associated access are different and can be overlapped into a continuous band-pass frequency range;
the band-pass frequency bands of the K filters in the third filter bank are respectively as follows:
k×Fs/2±BWB/2；
wherein k is [1, K ]]The method comprises the steps of carrying out a first treatment on the surface of the Bwb= FsB ×p, and FsB =fsx2k/2k+1, fsb is the second sampling frequency,
the third filter bank is used for supplementing a frequency band part of a cross-domain Nyquist sampling interval between the band-pass frequency bands of the first filter bank and the second filter bank;
the first frequency selecting channel, the second frequency selecting channel and the third frequency selecting channel are used for obtaining three continuous frequency band sampling results in a preset range through gating and sampling;
and the input end of the calculation module is connected with the output ends of the three frequency selection channels and is used for carrying out combination calculation on sampling results so as to obtain a spectrum analysis result of the received signals in the preset range.
2. The spectrum analysis circuit of claim 1, wherein the first ADC sampling element and the second ADC sampling element are set to a first sampling frequency;
the third ADC sampling element is set to a second sampling frequency.
3. The spectrum analysis circuit of claim 2, wherein the first filter bank is comprised of N filters, wherein the bandpass frequency band of each filter is: BW (BW);
where bw=fs×p, fs is the first sampling frequency,
the second filter bank is composed of M filters, wherein the band-pass frequency band of each filter is as follows: BW (BW);
where bw=fs×p, fs is the first sampling frequency,
the third filter bank is composed of K filters, wherein the band pass frequency band of each filter is as follows: BWB;
wherein bwb= FsB ×p and FsB =fsx2k/2k+1, fsb is the second sampling frequency,
4. the spectrum analysis circuit of claim 1, wherein the bandpass frequency bands of the N filters in the first filter bank are respectively:
[4×(n-1)+1]×Fs/4±BW/2；
the nyquist sampling intervals of the first ADC sampling elements where the respective filters in the first filter bank are located are respectively:
x＝2×N-1；
wherein n is E [1, N]The method comprises the steps of carrying out a first treatment on the surface of the Bw=fs×p, fs is the first sampling frequency,x is the nyquist sampling interval of the first ADC sampling element.
5. The spectrum analysis circuit of claim 1, wherein band pass bands of the M filters in the second filter bank are respectively:
[4×(m-1)+3]×Fs/4±BW/2；
the nyquist sampling intervals of the second ADC sampling elements where the respective filters in the second filter bank are located are respectively:
y＝2×M；
wherein m is E [1, M]The method comprises the steps of carrying out a first treatment on the surface of the Bw=fs×p, fs is the first sampling frequency,y is the nyquist sampling interval of the second ADC sampling element.
6. The spectrum analysis circuit of claim 1, wherein nyquist sampling intervals of the third ADC sampling element where each filter in the third filter bank is located are respectively:
z＝K+1；
wherein k is [1, K ]]The method comprises the steps of carrying out a first treatment on the surface of the Bwb= FsB ×p, and FsB =fsx2k/2k+1, fsb is the second sampling frequency,z is the nyquist sampling interval of the third ADC sampling element.
7. The spectrum analysis circuit according to any one of claims 5 to 6, wherein, when the i-th access is adopted,
the filter access sequence of the first filter bank is as follows: n=i// 2+1;
the filter access sequence of the second filter bank is as follows: m= (i-1)// 2+1;
the filter access sequence of the third filter bank is as follows: k=i;
where i is the filter access order of the third filter bank and/is the division round calculation.
8. The spectrum analysis circuit of claim 1, wherein the computing module is specifically configured to:
acquiring nyquist sampling intervals of the first, second and third ADC sampling elements where band-pass frequency bands of the first, second and third filter banks are respectively;
respectively carrying out spectrum analysis on continuous sampling results of three frequency bands in the preset range according to the Nyquist sampling interval so as to obtain real spectrums of all the frequency bands;
and splicing the real spectrums of the frequency bands to obtain a spectrum analysis result of the received signals in the preset range.
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