CN109541307B - Circuit structure for realizing ultra-wideband signal analysis function based on single frequency conversion technology - Google Patents
Circuit structure for realizing ultra-wideband signal analysis function based on single frequency conversion technology Download PDFInfo
- Publication number
- CN109541307B CN109541307B CN201910023937.3A CN201910023937A CN109541307B CN 109541307 B CN109541307 B CN 109541307B CN 201910023937 A CN201910023937 A CN 201910023937A CN 109541307 B CN109541307 B CN 109541307B
- Authority
- CN
- China
- Prior art keywords
- output end
- circuit module
- frequency
- input end
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 54
- 238000005516 engineering process Methods 0.000 title claims abstract description 25
- 238000011045 prefiltration Methods 0.000 claims abstract description 23
- 238000012545 processing Methods 0.000 claims abstract description 20
- 230000010355 oscillation Effects 0.000 claims abstract description 17
- 230000001360 synchronised effect Effects 0.000 claims abstract description 16
- 238000001514 detection method Methods 0.000 claims abstract description 9
- 238000005259 measurement Methods 0.000 abstract description 11
- 238000000034 method Methods 0.000 abstract description 4
- 230000000452 restraining effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- General Physics & Mathematics (AREA)
- Superheterodyne Receivers (AREA)
Abstract
The invention relates to a circuit structure for realizing an ultra-wideband signal analysis function based on a single frequency conversion technology, which comprises a pre-filter module, a filter module and a control module, wherein the pre-filter module is used for restraining out-of-band signals; the first channel circuit module is used for processing the input signal passing through the filter; the second channel circuit module is used for processing the input signal passing through the filter; the scanning synchronous generator is used for synchronously processing the local oscillation signals of the first channel circuit module and the second channel circuit module, the frequency of the digital oscillator and the detection output; the comparison circuit module is used for comparing the two paths of DET signals and outputting signals with low amplitude. The circuit structure for realizing the ultra-wideband signal analysis function based on the single frequency conversion technology is adopted, the measurement and analysis of wideband signals are realized, the circuit structure is simple, the advantage of single frequency conversion is realized, the power consumption of the circuit is reduced, the reliability is improved, and the cost is greatly reduced; the method can realize wide-band frequency coverage and effectively solve the problem of image frequency interference generated by single-stage frequency conversion. Has stronger practicability.
Description
Technical Field
The invention relates to the field of signal analysis, in particular to the field of broadband signal analyzers, and particularly relates to a circuit structure for realizing an ultra-broadband signal analysis function based on a single frequency conversion technology.
Background
The signal analyzer is radio frequency measuring equipment widely applied, and has the advantages of wide measuring frequency band, high sensitivity, good linearity and the like, and is widely applied to the fields of communication, navigation, radar and the like. A typical broadband spectrum analyzer measures the frequency range from low frequencies to continuously cover the microwave frequency range, such as 30Hz to 6GHz. In order to achieve excellent measurement precision and dynamic range, the device mostly adopts super heterodyne technical architecture, a measured signal is moved to a fixed intermediate frequency for processing through a frequency conversion technology, and the broadband device mostly adopts a 2-4-level frequency conversion scheme to realize full-frequency coverage due to the existence of mirror image frequency in the frequency conversion technology. The increase of the frequency conversion stage number correspondingly increases local oscillation, filtering and amplifying circuits and the like, which results in high complexity of the broadband equipment and higher cost, volume and power consumption of the circuit.
Fig. 1 is a schematic block diagram of a typical broadband signal analyzer. The technical scheme of 3-level frequency conversion is adopted. In this configuration, all the measured signals are shifted to the intermediate frequency with the fixed frequency IF 3. The first stage of frequency conversion typically employs a high intermediate frequency scheme, i.e., an intermediate frequency greater than the radio frequency. Therefore, to meet the frequency measurement range requirement, the first local oscillator must cover a certain frequency range and tune synchronously with the whole scanning circuit. The second stage and the third stage of frequency conversion are arranged, and the local oscillation frequency is fixed because the input and the output are both fixed frequencies. The tuning equation for the entire structure is as follows:
f1stLO-fRF＝f1stIF
f1stIF-f2ndLO＝f2ndIF
f2ndIF-f3rdLO＝f3rdIF
Wherein f RF is a radio frequency input frequency, f 1stLO is a first local oscillation frequency, f 1stIF is a first intermediate frequency, and f 2ndLO is a second local oscillation frequency. f 2ndIF is the second intermediate frequency, f 3rdLO is the third local oscillator frequency, and f 3rdIF is the third intermediate frequency.
Such complex multi-stage frequency conversion schemes are employed because of the additional image interference generated by the mixer. If the primary frequency conversion scheme of fig. 2 is adopted, the hardware circuit is simplified, and the measured signal is directly converted to an intermediate frequency. The tuning equation at this time is as follows:
fLO-fRF＝fIF；
Where f RF is the radio frequency input frequency, f LO is the first frequency, and f IF is the intermediate frequency.
According to the tuning equation, when the local oscillator sweep frequency is tuned to f LO＝fRF-fIF, 1-f IF co-frequency signals are generated, which is a major cause of the broadband receiver rarely adopting such one frequency conversion. Therefore, such a circuit with one frequency conversion is generally used for narrowband signal measurement and analysis, and the front end PRE FILTER in fig. 2 generally employs a band-pass filter, where the bandwidth of the band-pass filter is less than 2 times of the intermediate frequency.
In summary, the multi-stage frequency conversion scheme can realize broadband frequency coverage, but has a complex structure and high cost. Single frequency conversion is simple in structure, but only can achieve narrowband frequency coverage.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a circuit structure which has wide frequency coverage, low cost and simple structure and is used for realizing the ultra-wideband signal analysis function based on a single frequency conversion technology.
In order to achieve the above purpose, the circuit structure for realizing the ultra-wideband signal analysis function based on the single frequency conversion technology of the invention is as follows:
The circuit structure for realizing the ultra-wideband signal analysis function based on the single frequency conversion technology is mainly characterized in that the system comprises:
A pre-filter module for suppressing out-of-band signals;
The input end of the first channel circuit module is connected with the output end of the pre-filter module and is used for processing the input signal passing through the filter;
The input end of the second channel circuit module is connected with the output end of the pre-filter module and is used for processing the input signal passing through the filter;
the scanning synchronous generator is connected with the first channel circuit module and the second channel circuit module and is used for synchronously processing local oscillation signals of the first channel circuit module and the second channel circuit module, digital oscillator frequencies and detection outputs;
And the input ends of the comparison circuit modules are connected with the output ends of the first channel circuit module and the second channel circuit module, and are used for comparing two paths of DET signals and outputting signals with low amplitude.
Preferably, the first channel circuit module includes:
the input end of the first mixer is connected with the output end of the pre-filter module and is used for converting the radio frequency signal to an intermediate frequency;
the output end of the first local oscillator is connected with the input end of the first mixer, and the input end of the first local oscillator is connected with the output end of the scanning synchronous generator and is used for providing a frequency converter local oscillator signal with a required frequency coverage range;
the input end of the first band-pass filter is connected with the output end of the first mixer and is used for performing anti-aliasing;
The input end of the first analog-to-digital converter is connected with the output end of the first band-pass filter and is used for converting the analog intermediate frequency signal into a digital signal;
the input end of the first digital down converter is connected with the output end of the first analog-to-digital converter, and is used for converting and extracting signals and providing proper signal rate;
The output end of the first digital oscillator is connected with the input end of the first digital down converter, and the input end of the first digital oscillator is connected with the output end of the scanning synchronous generator and is used for generating digital local oscillation signals with the same Intermediate Frequency (IF);
The input end of the first resolution bandwidth filter is connected with the output end of the first digital down converter and is used for generating an FIR filter of signal analysis resolution;
the input end of the first detector is connected with the output end of the first resolution bandwidth filter, and the output end of the first detector is connected with the input end of the comparator and is used for detecting and outputting the amplitude of the signal in real time.
Preferably, the second channel circuit module includes:
the input end of the second mixer is connected with the output end of the pre-filter module and is used for converting the radio frequency signal to an intermediate frequency;
The output end of the second local oscillator is connected with the input end of the second mixer, and the input end of the second local oscillator is connected with the output end of the scanning synchronous generator and is used for providing a frequency converter local oscillator signal with a required frequency coverage range;
The input end of the second band-pass filter is connected with the output end of the second mixer and is used for performing anti-aliasing;
The input end of the second analog-to-digital converter is connected with the output end of the second band-pass filter and is used for converting the analog intermediate frequency signal into a digital signal;
The input end of the second digital down converter is connected with the output end of the second analog-to-digital converter, and is used for converting and extracting signals and providing proper signal rate;
the output end of the second digital oscillator is connected with the input end of the second digital down converter, and the input end of the second digital oscillator is connected with the output end of the scanning synchronous generator and is used for generating digital local oscillation signals with the same Intermediate Frequency (IF) frequency;
The input end of the second resolution bandwidth filter is connected with the output end of the second digital down converter and is used for generating an FIR filter of signal analysis resolution;
The input end of the second detector is connected with the output end of the second resolution bandwidth filter, and the output end of the second detector is connected with the input end of the comparator and is used for detecting and outputting the amplitude of the signal in real time.
Preferably, the system further comprises an external display module, and an input end of the external display module is connected with an output end of the comparison circuit module and is used for displaying an output result.
Preferably, the pre-filter module includes a low pass filter.
Preferably, the center frequency of the first band-pass filter is IF1, and the bandwidth is larger than the bandwidth of the measured signal.
Preferably, the intermediate frequency IF1 of the first channel circuit module and the intermediate frequency IF2 of the second channel circuit module have a frequency difference Δf.
Preferably, Δf is greater than the actual bandwidth of the measured signal and greater than the RBW filter.
Preferably, the tuning equation of the first channel circuit module is specifically:
tuning the first channel circuit module according to the following equation:
fLO1-fRF＝fIF1；
fLO1＝fRF+fIF1；
Wherein f LO1 is a local oscillator signal of the first channel circuit module, f IF1 is an intermediate frequency of the first channel circuit module, and f RF is a radio frequency input frequency.
Preferably, the tuning equation of the second channel circuit module is specifically:
tuning the second channel circuit module according to the following equation:
fLO2-fRF＝fIF2；
fLO2＝fRF+fIF2＝fRF+fIF1+Δf；
Wherein f LO2 is a local oscillator signal of the second channel circuit module, f IF1 is an intermediate frequency of the first channel circuit module, f IF2 is an intermediate frequency of the second channel circuit module, f RF is a radio frequency input frequency, and Δf is a frequency difference between f IF1 and f IF2.
The circuit structure for realizing the ultra-wideband signal analysis function based on the single frequency conversion technology adopts a one-time frequency conversion mode, realizes the measurement and analysis of wideband signals, and has the following advantages compared with the traditional multi-stage frequency conversion and single-stage frequency conversion scheme: (1) The scheme has the advantages of simple circuit structure, single frequency conversion, reduced power consumption, improved reliability and greatly reduced cost. (2) The scheme can realize wide-band frequency coverage and effectively solve the problem of image frequency interference generated by single-stage frequency conversion. Has stronger practicability. (3) The signal processing of the scheme adopts a large number of digital signal processing technologies, can be processed in software and FPGA, further simplifies the complexity of hardware, and simultaneously, the applicability of the hardware is further provided.
Drawings
Fig. 1 is a schematic block diagram of a prior art microwave signal analyzer.
Fig. 2 is a schematic diagram of a signal analyzer using one-time frequency conversion according to the prior art.
Fig. 3 is an output result after image frequency synthesis and detection of the circuit structure for realizing the ultra-wideband signal analysis function based on the single frequency conversion technology.
Fig. 4 is a primary frequency conversion schematic block diagram of a circuit structure adopting a difference frequency scheme for realizing an ultra-wideband signal analysis function based on a single frequency conversion technology.
Fig. 5 is a time-division frequency conversion schematic block diagram of a circuit structure adopting a difference frequency scheme for realizing an ultra-wideband signal analysis function based on a single frequency conversion technology.
Detailed Description
In order to more clearly describe the technical contents of the present invention, a further description will be made below in connection with specific embodiments.
This circuit structure based on single frequency conversion technique realizes ultra wide band signal analysis function, wherein, the system include:
A pre-filter module for suppressing out-of-band signals;
The input end of the first channel circuit module is connected with the output end of the pre-filter module and is used for processing the input signal passing through the filter;
The input end of the second channel circuit module is connected with the output end of the pre-filter module and is used for processing the input signal passing through the filter;
the scanning synchronous generator is connected with the first channel circuit module and the second channel circuit module and is used for synchronously processing local oscillation signals of the first channel circuit module and the second channel circuit module, digital oscillator frequencies and detection outputs;
And the input ends of the comparison circuit modules are connected with the output ends of the first channel circuit module and the second channel circuit module, and are used for comparing two paths of DET signals and outputting signals with low amplitude.
As a preferred embodiment of the present invention, the first channel circuit module includes:
the input end of the first mixer is connected with the output end of the pre-filter module and is used for converting the radio frequency signal to an intermediate frequency;
the output end of the first local oscillator is connected with the input end of the first mixer, and the input end of the first local oscillator is connected with the output end of the scanning synchronous generator and is used for providing a frequency converter local oscillator signal with a required frequency coverage range;
the input end of the first band-pass filter is connected with the output end of the first mixer and is used for performing anti-aliasing;
The input end of the first analog-to-digital converter is connected with the output end of the first band-pass filter and is used for converting the analog intermediate frequency signal into a digital signal;
the input end of the first digital down converter is connected with the output end of the first analog-to-digital converter, and is used for converting and extracting signals and providing proper signal rate;
The output end of the first digital oscillator is connected with the input end of the first digital down converter, and the input end of the first digital oscillator is connected with the output end of the scanning synchronous generator and is used for generating digital local oscillation signals with the same Intermediate Frequency (IF);
The input end of the first resolution bandwidth filter is connected with the output end of the first digital down converter and is used for generating an FIR filter of signal analysis resolution;
the input end of the first detector is connected with the output end of the first resolution bandwidth filter, and the output end of the first detector is connected with the input end of the comparator and is used for detecting and outputting the amplitude of the signal in real time.
As a preferred embodiment of the present invention, the second channel circuit module includes:
the input end of the second mixer is connected with the output end of the pre-filter module and is used for converting the radio frequency signal to an intermediate frequency;
The output end of the second local oscillator is connected with the input end of the second mixer, and the input end of the second local oscillator is connected with the output end of the scanning synchronous generator and is used for providing a frequency converter local oscillator signal with a required frequency coverage range;
The input end of the second band-pass filter is connected with the output end of the second mixer and is used for performing anti-aliasing;
The input end of the second analog-to-digital converter is connected with the output end of the second band-pass filter and is used for converting the analog intermediate frequency signal into a digital signal;
The input end of the second digital down converter is connected with the output end of the second analog-to-digital converter, and is used for converting and extracting signals and providing proper signal rate;
the output end of the second digital oscillator is connected with the input end of the second digital down converter, and the input end of the second digital oscillator is connected with the output end of the scanning synchronous generator and is used for generating digital local oscillation signals with the same Intermediate Frequency (IF) frequency;
The input end of the second resolution bandwidth filter is connected with the output end of the second digital down converter and is used for generating an FIR filter of signal analysis resolution;
The input end of the second detector is connected with the output end of the second resolution bandwidth filter, and the output end of the second detector is connected with the input end of the comparator and is used for detecting and outputting the amplitude of the signal in real time.
Preferably, the system further comprises an external display module, and an input end of the external display module is connected with an output end of the comparison circuit module and is used for displaying an output result.
Preferably, the pre-filter module includes a low pass filter.
As a preferred embodiment of the present invention, the first band-pass filter has a center frequency of IF1 and a bandwidth greater than that of the measured signal.
As a preferred embodiment of the present invention, the intermediate frequency IF1 of the first channel circuit module and the intermediate frequency IF2 of the second channel circuit module have a frequency difference Δf.
As a preferred embodiment of the present invention, Δf is greater than the actual bandwidth of the measured signal and greater than the RBW filter.
As a preferred embodiment of the present invention, the tuning equation of the first channel circuit module is specifically:
tuning the first channel circuit module according to the following equation:
fLO1-fRF＝fIF1；
fLO1＝fRF+fIF1；
Wherein f LO1 is a local oscillator signal of the first channel circuit module, f IF1 is an intermediate frequency of the first channel circuit module, and f RF is a radio frequency input frequency.
As a preferred embodiment of the present invention, the tuning equation of the second channel circuit module is specifically:
tuning the second channel circuit module according to the following equation:
fLO2-fRF＝fIF2；
fLO2＝fRF+fIF2＝fRF+fIF1+Δf；
Wherein f LO2 is a local oscillator signal of the second channel circuit module, f IF1 is an intermediate frequency of the first channel circuit module, f IF2 is an intermediate frequency of the second channel circuit module, f RF is a radio frequency input frequency, and Δf is a frequency difference between f IF1 and f IF2.
In a specific embodiment of the invention, the image frequency is generated at a frequency 2 times the intermediate frequency from the useful signal, and if the intermediate frequency is changed, the frequency of the image frequency is subjected to a frequency difference of 2Δf. If the signals are respectively converted to different intermediate frequencies, the detection outputs of the two intermediate frequencies are identical at the expected frequency, but have frequency differences at the image frequencies, and the image frequencies can be distinguished after the synthetic detection, as shown in fig. 3.
According to the method, the following implementation method is designed, and is shown in fig. 3. After the signals are filtered, the signals enter the channel 1 and the channel 2 for processing, the circuit structures of the channel 1 and the channel 2 are identical, the difference is that the intermediate frequency IF1 and the intermediate frequency IF2 have the frequency difference delta f, the intermediate frequency F1 and the intermediate frequency F2 are respectively tuned to the respective intermediate frequency, the output of the digital oscillators NCO1 and NCO2 is identical to the intermediate frequency, the output of the two channels enters the comparison circuit COMP, the minimum signal is taken, and the minimum signal is sent to the outside for displaying and outputting the result. The circuit can effectively inhibit image interference generated by single frequency conversion.
Fig. 4 includes blocks of circuit configuration, each of which functions as follows:
Prefilter (PRE FILTER): for suppressing out-of-band signals, the broadband measurement employs a low pass filter.
Mixer (Mixer 1): a channel 1 mixer for converting the radio frequency signal to an intermediate frequency.
Local oscillator (LO 1): and providing the frequency converter local oscillation signal with the required frequency coverage range.
Band-pass filter (BPF 1): the band-pass filter with the center frequency of IF1 has a bandwidth BW larger than that of the measured signal and has the characteristics of a channel anti-aliasing filter.
Analog-to-digital converter (ADC): the analog intermediate frequency signal is converted into a digital signal.
Digital Down Converter (DDC): the signal is transformed and decimated to provide the appropriate signal rate.
Digital oscillator (NCO): resulting from digital local oscillator signals having the same intermediate frequency IF frequency.
Resolution bandwidth filter (RBW): an FIR filter for generating a signal analysis resolution.
Detector (DET): the amplitude of the signal is detected in real time and output.
Comparator (COMP): the two DET signals are compared, and a signal with low amplitude is output.
A Sweep Generator (Sweep Generator): the circuit is a key circuit for realizing the scheme and is used for synchronously processing the local oscillation signals of 2 channels, the frequency of the digital oscillator and the detection output.
The tuning equation for the two channels is as follows:
Channel 1:
fLO1-fRF＝fIF1；
fLO1＝fRF+fIF1；
Channel 2:
fLO2-fRF＝fIF2；
fLO2＝fRF+fIF2＝fRF+fIF1+Δf；
The tuning frequencies of LO1 and LO2 differ by Δf, where the choice of Δf mainly takes into account two factors, the first is the signal measurement bandwidth, Δf must be greater than the actual bandwidth of the measured signal, otherwise aliasing of detection is caused to the wideband signal, and it cannot be effectively distinguished. The second is that Δf must be greater than the RBW filter.
According to the technical scheme, a single frequency conversion scheme is adopted, but double-channel processing is used, and the problem of image interference of single frequency conversion is effectively solved through the signal amplitude difference of the two channels. Compared with multi-stage frequency conversion, the circuit structure is greatly simplified. Considering that the two channels are processed simultaneously, the circuit structure is further simplified if the two channels can be multiplexed for steady state signals.
The schematic block diagram after time division multiplexing the channel is shown in fig. 5, and the measurement is completed once, the local oscillation is required to be tuned for 2 times, the first time is scanned according to the IF1, all measurement results are stored, the second time is scanned according to the IF2, and the comparison is carried out with the corresponding first scanning data, and the output is displayed. Compared with fig. 4, the scheme further simplifies the channel, and only one channel band-pass filter is added, which corresponds to different intermediate frequency respectively. But due to the time-sharing scanning this scheme is only applicable to the measurement of steady state signals.
The circuit structure for realizing the ultra-wideband signal analysis function based on the single frequency conversion technology adopts a one-time frequency conversion mode, realizes the measurement and analysis of wideband signals, and has the following advantages compared with the traditional multi-stage frequency conversion and single-stage frequency conversion scheme: (1) The scheme has the advantages of simple circuit structure, single frequency conversion, reduced power consumption, improved reliability and greatly reduced cost. (2) The scheme can realize wide-band frequency coverage and effectively solve the problem of image frequency interference generated by single-stage frequency conversion. Has stronger practicability. (3) The signal processing of the scheme adopts a large number of digital signal processing technologies, can be processed in software and FPGA, further simplifies the complexity of hardware, and simultaneously, the applicability of the hardware is further provided.
In this specification, the invention has been described with reference to specific embodiments thereof. It will be apparent that various modifications and variations can be made without departing from the spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.
Claims (8)
1. A circuit structure for realizing ultra-wideband signal analysis function based on single frequency conversion technology is characterized in that the circuit structure comprises:
A pre-filter module for suppressing out-of-band signals;
The input end of the first channel circuit module is connected with the output end of the pre-filter module and is used for processing the input signal passing through the filter;
The input end of the second channel circuit module is connected with the output end of the pre-filter module and is used for processing the input signal passing through the filter;
the scanning synchronous generator is connected with the first channel circuit module and the second channel circuit module and is used for synchronously processing local oscillation signals of the first channel circuit module and the second channel circuit module, digital oscillator frequencies and detection outputs;
The input end of the comparison circuit module is connected with the output end of the first channel circuit module and the output end of the second channel circuit module, and is used for comparing two paths of DET signals and outputting signals with low amplitude;
The first channel circuit module includes:
the input end of the first mixer is connected with the output end of the pre-filter module and is used for converting the radio frequency signal to an intermediate frequency;
the output end of the first local oscillator is connected with the input end of the first mixer, and the input end of the first local oscillator is connected with the output end of the scanning synchronous generator and is used for providing a frequency converter local oscillator signal with a required frequency coverage range;
the input end of the first band-pass filter is connected with the output end of the first mixer and is used for performing anti-aliasing;
The input end of the first analog-to-digital converter is connected with the output end of the first band-pass filter and is used for converting the analog intermediate frequency signal into a digital signal;
the input end of the first digital down converter is connected with the output end of the first analog-to-digital converter, and is used for converting and extracting signals and providing proper signal rate;
The output end of the first digital oscillator is connected with the input end of the first digital down converter, and the input end of the first digital oscillator is connected with the output end of the scanning synchronous generator and is used for generating digital local oscillation signals with the same Intermediate Frequency (IF);
The input end of the first resolution bandwidth filter is connected with the output end of the first digital down converter and is used for generating an FIR filter of signal analysis resolution;
The input end of the first detector is connected with the output end of the first resolution bandwidth filter, and the output end of the first detector is connected with the input end of the comparison circuit module and is used for detecting and outputting the amplitude of the signal in real time;
The second channel circuit module includes:
the input end of the second mixer is connected with the output end of the pre-filter module and is used for converting the radio frequency signal to an intermediate frequency;
The output end of the second local oscillator is connected with the input end of the second mixer, and the input end of the second local oscillator is connected with the output end of the scanning synchronous generator and is used for providing a frequency converter local oscillator signal with a required frequency coverage range;
The input end of the second band-pass filter is connected with the output end of the second mixer and is used for performing anti-aliasing;
The input end of the second analog-to-digital converter is connected with the output end of the second band-pass filter and is used for converting the analog intermediate frequency signal into a digital signal;
The input end of the second digital down converter is connected with the output end of the second analog-to-digital converter, and is used for converting and extracting signals and providing proper signal rate;
the output end of the second digital oscillator is connected with the input end of the second digital down converter, and the input end of the second digital oscillator is connected with the output end of the scanning synchronous generator and is used for generating digital local oscillation signals with the same Intermediate Frequency (IF) frequency;
The input end of the second resolution bandwidth filter is connected with the output end of the second digital down converter and is used for generating an FIR filter of signal analysis resolution;
the input end of the second detector is connected with the output end of the second resolution bandwidth filter, and the output end of the second detector is connected with the input end of the comparison circuit module and is used for detecting and outputting the amplitude of the signal in real time.
2. The circuit structure for realizing the ultra-wideband signal analysis function based on the single frequency conversion technology as claimed in claim 1, wherein the circuit structure further comprises an external display module, and the input end of the external display module is connected with the output end of the comparison circuit module for displaying the output result.
3. The circuit structure for realizing ultra-wideband signal analysis function based on single frequency conversion technology as claimed in claim 1, wherein the pre-filter module comprises a low-pass filter.
4. The circuit structure for realizing ultra-wideband signal analysis function based on single frequency conversion technology as claimed in claim 1, wherein the center frequency of the first band-pass filter is IF1, and the bandwidth is larger than the bandwidth of the detected signal.
5. The circuit structure for realizing the ultra-wideband signal analysis function based on the single frequency conversion technology as claimed in claim 1, wherein the intermediate frequency IF1 of the first channel circuit module and the intermediate frequency IF2 of the second channel circuit module have a frequency difference Δf.
6. The circuit structure for realizing ultra-wideband signal analysis based on single frequency conversion technology as claimed in claim 5, wherein Δf is larger than the actual bandwidth of the measured signal and larger than the RBW filter.
7. The circuit structure for realizing the ultra-wideband signal analysis function based on the single frequency conversion technology according to claim 1, wherein the tuning equation of the first channel circuit module is specifically:
tuning the first channel circuit module according to the following equation:
fLO1-fRF＝fIF1；
fLO1＝fRF+fIF1；
Wherein f LO1 is a local oscillator signal of the first channel circuit module, f IF1 is an intermediate frequency of the first channel circuit module, and f RF is a radio frequency input frequency.
8. The circuit structure for realizing the ultra-wideband signal analysis function based on the single frequency conversion technology according to claim 1, wherein the tuning equation of the second channel circuit module is specifically:
tuning the second channel circuit module according to the following equation:
fLO2-fRF＝fIF2；
fLO2＝fRF+fIF2＝fRF+fIF1+Δf；
Wherein f LO2 is a local oscillator signal of the second channel circuit module, f IF1 is an intermediate frequency of the first channel circuit module, f IF2 is an intermediate frequency of the second channel circuit module, f RF is a radio frequency input frequency, and Δf is a frequency difference between f IF1 and f IF2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910023937.3A CN109541307B (en) | 2019-01-10 | 2019-01-10 | Circuit structure for realizing ultra-wideband signal analysis function based on single frequency conversion technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910023937.3A CN109541307B (en) | 2019-01-10 | 2019-01-10 | Circuit structure for realizing ultra-wideband signal analysis function based on single frequency conversion technology |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109541307A CN109541307A (en) | 2019-03-29 |
| CN109541307B true CN109541307B (en) | 2024-05-17 |
Family
ID=65834890
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910023937.3A Active CN109541307B (en) | 2019-01-10 | 2019-01-10 | Circuit structure for realizing ultra-wideband signal analysis function based on single frequency conversion technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109541307B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111030765B (en) * | 2019-12-05 | 2021-07-13 | 电子科技大学 | Heterodyne frequency sweep type spectrum analysis system capable of identifying image frequency signals |
| CN111010209A (en) * | 2019-12-13 | 2020-04-14 | 上海创远仪器技术股份有限公司 | Circuit structure for realizing real-time frequency hopping communication interference suppression |
| CN113595570A (en) * | 2021-08-17 | 2021-11-02 | 福建科立讯通信有限公司 | Method and device for solving mirror image interference |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000068752A (en) * | 1998-08-24 | 2000-03-03 | Sharp Corp | Receiver for digital broadcasting |
| JP2005055412A (en) * | 2003-08-01 | 2005-03-03 | High Speed Signal Processing Laboratory Inc | Fast-fourier transform type frequency analyzer |
| CN201409128Y (en) * | 2009-05-15 | 2010-02-17 | 北京朗波芯微技术有限公司 | RF (Radio Frequency) transceiver correction device used for ZIF (zero intermediate frequency ) or LMF (Low Medium Frequency) structure |
| CN201464557U (en) * | 2009-03-16 | 2010-05-12 | 邵啸 | Intermediate frequency spectrum monitoring device |
| CN102201789A (en) * | 2010-07-14 | 2011-09-28 | 锐迪科科技有限公司 | LNB (low noise block) down-conversion chip circuit and LNB down-conversion chip as well as LNB down-conversion circuit and method |
| CN102970030A (en) * | 2012-11-01 | 2013-03-13 | 南京国睿安泰信科技股份有限公司 | System for achieving spectrum analyzer down-conversion by using broadband local oscillator and high frequency phase discrimination |
| CN103067104A (en) * | 2012-12-27 | 2013-04-24 | 上海创远仪器技术股份有限公司 | System and method for measuring radio-frequency signal high-speed sweeping frequency spectrum based on digital local oscillator |
| CN103134984A (en) * | 2013-03-02 | 2013-06-05 | 安徽白鹭电子科技有限公司 | Fast Fourier transform (FFT) broadband frequency spectrometer design based on AD9864 medium frequency digitization system |
| CN203800933U (en) * | 2014-05-08 | 2014-08-27 | 深圳翔成电子科技有限公司 | Wideband KU wave band dual output satellite down converter |
| CN204089733U (en) * | 2014-10-17 | 2015-01-07 | 成都九华圆通科技发展有限公司 | A kind of microwave wideband band low-converter |
| CN106405235A (en) * | 2016-10-17 | 2017-02-15 | 深圳市鼎阳科技有限公司 | Spectrum analyzer and data processing method thereof |
| CN106788511A (en) * | 2016-12-30 | 2017-05-31 | 北京时代民芯科技有限公司 | A kind of wideband radio receiver |
-
2019
- 2019-01-10 CN CN201910023937.3A patent/CN109541307B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000068752A (en) * | 1998-08-24 | 2000-03-03 | Sharp Corp | Receiver for digital broadcasting |
| JP2005055412A (en) * | 2003-08-01 | 2005-03-03 | High Speed Signal Processing Laboratory Inc | Fast-fourier transform type frequency analyzer |
| CN201464557U (en) * | 2009-03-16 | 2010-05-12 | 邵啸 | Intermediate frequency spectrum monitoring device |
| CN201409128Y (en) * | 2009-05-15 | 2010-02-17 | 北京朗波芯微技术有限公司 | RF (Radio Frequency) transceiver correction device used for ZIF (zero intermediate frequency ) or LMF (Low Medium Frequency) structure |
| CN102201789A (en) * | 2010-07-14 | 2011-09-28 | 锐迪科科技有限公司 | LNB (low noise block) down-conversion chip circuit and LNB down-conversion chip as well as LNB down-conversion circuit and method |
| CN102970030A (en) * | 2012-11-01 | 2013-03-13 | 南京国睿安泰信科技股份有限公司 | System for achieving spectrum analyzer down-conversion by using broadband local oscillator and high frequency phase discrimination |
| CN103067104A (en) * | 2012-12-27 | 2013-04-24 | 上海创远仪器技术股份有限公司 | System and method for measuring radio-frequency signal high-speed sweeping frequency spectrum based on digital local oscillator |
| CN103134984A (en) * | 2013-03-02 | 2013-06-05 | 安徽白鹭电子科技有限公司 | Fast Fourier transform (FFT) broadband frequency spectrometer design based on AD9864 medium frequency digitization system |
| CN203800933U (en) * | 2014-05-08 | 2014-08-27 | 深圳翔成电子科技有限公司 | Wideband KU wave band dual output satellite down converter |
| CN204089733U (en) * | 2014-10-17 | 2015-01-07 | 成都九华圆通科技发展有限公司 | A kind of microwave wideband band low-converter |
| CN106405235A (en) * | 2016-10-17 | 2017-02-15 | 深圳市鼎阳科技有限公司 | Spectrum analyzer and data processing method thereof |
| CN106788511A (en) * | 2016-12-30 | 2017-05-31 | 北京时代民芯科技有限公司 | A kind of wideband radio receiver |
Non-Patent Citations (3)
| Title |
|---|
| Low-Power Baseband Folded Gilbert Cell Mixer for Frequency-Domain A/D Converter in 0.18 μm CMOS;Mohamed Zebdi 等;《2010 Second International Conference on Advances in Satellite and Space Communications》;第42-46页 * |
| 宽带信道化接收机的研究与实现;罗旭;《中国优秀硕士学位论文全文数据库信息科技辑》(第2期);第I136-51页 * |
| 高性能频谱分析仪中频信号处理技术研究;陈爽;《中国优秀硕士学位论文全文数据库工程科技Ⅱ辑》(第4期);第C030-44页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109541307A (en) | 2019-03-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7688058B2 (en) | Integrated spectrum analyzer circuits and methods for providing on-chip diagnostics | |
| CN109541307B (en) | Circuit structure for realizing ultra-wideband signal analysis function based on single frequency conversion technology | |
| CN103067104B (en) | System and method for measuring radio-frequency signal high-speed sweeping frequency spectrum based on digital local oscillator | |
| CN107462874B (en) | RF receiver with built-in self-test function | |
| CN102435846B (en) | Multiple domain test and sensing device is with its method of operating | |
| EP1050759B1 (en) | Bandpass sampling architecture for wide-frequency band signal analysis | |
| CN110837002B (en) | Spectrum scanning measuring device and time domain waveform obtaining method | |
| CN104459317A (en) | Frequency spectrum analyzer capable of inhibiting mirror image frequency | |
| CN113055102A (en) | Receiver and method for ultrahigh frequency partial discharge detection | |
| US20080097710A1 (en) | Method for Measuring the Phase Jitter of a High-Frequency Signal and a Measuring Device for the Implementation of This Method | |
| CN209764946U (en) | circuit structure for realizing ultra-wideband signal analysis function based on single frequency conversion technology | |
| CN111030765B (en) | Heterodyne frequency sweep type spectrum analysis system capable of identifying image frequency signals | |
| CN106353594A (en) | Spectrum analyzer system with fast multi-resolution and method | |
| CN210327547U (en) | Real-time frequency spectrum monitoring equipment | |
| Slim et al. | A novel multichannel amplitude probability distribution for a time-domain EMI measurement system according to CISPR 16-1-1 | |
| CN113422604B (en) | Frequency synthesizer | |
| CN114401019A (en) | Large-bandwidth high-sensitivity receiving front-end circuit | |
| CN109474288B (en) | Circuit structure for improving dynamic range of receiver based on reverse phase offset mechanism | |
| Prisco et al. | Compressive sampling based radar receiver | |
| Henrion et al. | SETHI: Digital radar system for signal generation and acquisition | |
| KR100518031B1 (en) | Apparatus for the generation of calibration signal in receiver | |
| JP7270957B2 (en) | Frequency spectrum reproduction method, frequency spectrum reproduction device, receiver and reception method | |
| Jatin et al. | A Configurable, Multi-Channel, Direct Wideband RF Sampling SWaP-C Optimized Transceiver and Processing Module for EW Systems | |
| CN210604778U (en) | Frequency characteristic analyzer | |
| Braun | Spectrum analysis and EMI measurements based on time-domain methods |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |