Patents
Search within
Search within the title, abstract, claims, or full patent document: You can restrict your search to a specific field using field names.
Use TI= to search in the title, AB= for the abstract, CL= for the claims, or TAC= for all three. For example, TI=(safety belt).
Search by Cooperative Patent Classifications (CPCs): These are commonly used to represent ideas in place of keywords, and can also be entered in a search term box. If you're searching forseat belts, you could also search for B60R22/00 to retrieve documents that mention safety belts or body harnesses. CPC=B60R22 will match documents with exactly this CPC, CPC=B60R22/low matches documents with this CPC or a child classification of this CPC.
Learn More
Title
Abstract
Claims
Full Document
Find patents
Keywords and boolean syntax (USPTO or EPO format): seat belt searches these two words, or their plurals and close synonyms. "seat belt" searches this exact phrase, in order. -seat -belt searches for documents not containing either word.
For searches using boolean logic, the default operator is AND with left associativity. Note: this means safety OR seat belt is searched as (safety OR seat) AND belt. Each word automatically includes plurals and close synonyms. Adjacent words that are implicitly ANDed together, such as (safety belt), are treated as a phrase when generating synonyms.
Learn More
Search by
Chemistry searches match terms (trade names, IUPAC names, etc. extracted from the entire document, and processed from .MOL files.)
Substructure (use SSS=) and similarity (use ~) searches are limited to one per search at the top-level AND condition. Exact searches can be used multiple times throughout the search query.
Searching by SMILES or InChi key requires no special syntax. To search by SMARTS, use SMARTS=.
To search for multiple molecules, select "Batch" in the "Type" menu. Enter multiple molecules separated by whitespace or by comma.
Learn More
Patent numbers
Search specific patents by importing a CSV or list of patent publication or application numbers.
Microwave signal generating device
Description
translated from
Technical field
The present invention relates to communication technical field, particularly relate to a kind of microwave signal generating apparatus.
Background technology
When carrying out testing of equipment,, also increasingly high to the requirement of signal excitation along with the frequency and the bandwidth raising of equipment under test; Require the signal excitation device to have continuous wideband section, multiple modulating mode, the modulation signal in broadband, version and the volume to exciting bank also claims simultaneously; Not only want cube little; Require to possess modularization and the characteristics of reshuffling simultaneously, see from long-range angle, effectively the cost of lowering apparatus.
Yet, in the prior art still the no signal exciting bank can realize above-mentioned purpose, for this reason, be necessary to develop a kind of novel signal excitation device to address this problem.
Summary of the invention
The present invention provides a kind of microwave signal generating apparatus, to solve the problem that signal excitation device of the prior art does not have continuous wideband section.
The present invention provides a kind of microwave signal generating apparatus, comprising:
Base band sources is used to produce baseband signal;
The local oscillator module is used to produce local oscillation signal;
The up-conversion module is used for accomplishing the quadrature modulation process according to said baseband signal and said local oscillation signal, obtains vector signal;
Said up-conversion module comprises the quadrature modulator that is in different frequency range more than two.
Further, the digital modulation type of said baseband signal is one of following type:
AM (amplitude modulation), FM (frequency modulation), ASK (amplitude shift keying), FSK (Frequency-shift keying; Frequency shift keying), BPSK (Binary Phase Shift Keying; Biphase phase shift keying), QPSK (Quadrature Phase Shift Keying, QPSK), 16QAM (Quadrature Amplitude Modulation, quadrature amplitude modulation) and 64QAM.
Further, said baseband signal is IQ (quadrature up-conversion) signal of difference.
Further, the way of said local oscillation signal equals the number of said quadrature modulator, and promptly said local oscillator module provides one tunnel said local oscillation signal for each said quadrature modulator.
Further, said local oscillator module also is used for clock signal is exported to said up-conversion module, and said up-conversion module also is used for exporting said clock signal to said base band sources.
Further, the said quadrature modulator that is in different frequency range more than two, its frequency range is continuous each other.
Further, microwave signal generating apparatus of the present invention also comprises the analog signal generation module, and the local oscillation signal that this analog signal generation module is used for providing according to said local oscillator module generates analog signal.
Further, said analog signal generation module comprises first frequency mixer and filter; Wherein, the frequency that said first frequency mixer is used to receive said local oscillator module and provides is higher than the local oscillation signal of a pre-set threshold value, with independently AM signal or FM signal carry out mixing; Said filter is used for the signal of said first frequency mixer output is carried out filtering.
Again further, said analog signal generation module also comprises amplifier, and this amplifier is used for the signal of said filter output is amplified.
Again further, said analog signal generation module also comprises second frequency mixer, and the frequency that this second frequency mixer is used to receive said local oscillator module and provides is lower than the local oscillation signal of said pre-set threshold value, carries out mixing with the output signal of said amplifier.
Beneficial effect of the present invention is following:
The present invention has realized the generation of the vector signal of continuous multiband through adopting the mode of a plurality of quadrature modulator splicings; The present invention simultaneously is owing to introduced the analog signal generation module; Adopt means such as mixing, filtering, amplification to realize the generation of analog signal; Thereby can generate two kinds of signals of analog signal and vector signal, and two kinds of signals all can be the broadband signal of continuous wave section.Finally can select the output of desired signal through the mode of control switch.
Microwave signal generating apparatus of the present invention also has simple in structure, and cost is low, is easy to the characteristics of safeguarding and upgrading.
Description of drawings
Fig. 1 is the microwave signal generating apparatus structural representation of the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, does not limit the present invention.
According to embodiments of the invention; A kind of microwave signal generating apparatus is provided; Fig. 1 is the structural representation of the microwave signal generating apparatus of the embodiment of the invention; As shown in Figure 1, the microwave signal generating apparatus of the embodiment of the invention comprises: base band sources, up-conversion module, local oscillator module and analog signal generation module.Below each module of the embodiment of the invention is carried out detailed explanation.
Particularly, base band sources produces various Broad-band Modulated Signal, and exports to the up-conversion module through the IQ mode, and signal bandwidth is DC～80MHz.Base band sources produces various digital modulation types, comprises modes such as AM, FM, ASK, FSK, BPSK, QPSK, 16QAM, 64QAM, and for adapting to the modern communications growth requirement, these digital modulation have the characteristics in broadband; All kinds of digital modulation signals that produced are carried on the IQ modulator (being quadrature modulator) through the IQ mode.
The up-conversion module comprises plural broadband IQ modulator, realizes the quadrature up-conversion of wideband baseband IQ signal to local oscillation signal.In the embodiment of the invention; For reaching the broadband requirement of 26.5GHz; Adopted the scheme of IQ modulator splicing, three the IQ modulators of frequency range at 100MHz～4GHz, 4GHz～18GHz and 18GHz～26.5GHz have been spliced, realized respectively that at different frequency range vector signal produces; Carry out the splicing of frequency range then through switch, finally accomplish the vector signal modulation of 1MHz～26.5GHz.The frequency range of each IQ modulator that splices in embodiments of the present invention, is continuous.
In the present embodiment, the local oscillation signal of quadrature modulation is provided by the local oscillator module, has three road local oscillation signals, and three road local oscillation signals are respectively 100MHz～4GHz, 4GHz～18GHz, and 18GHz～26.5GHz sends into the IQ modulator of three correspondences respectively.The local oscillator module is exported to the up-conversion module with clock signal simultaneously, and the up-conversion module exports clock signal to the clock port of base band sources simultaneously, guarantees the clock synchronization between base band sources, local oscillator module and these three modules of up-conversion module.Local oscillation signal gets into variable connector respectively again after the baseband signal modulation, unification is carried out ALC (Automatic Level Control, automatic electric-level control) power adjustment by detecting circuit.For reaching ALC control effect, feedback circuit control is carried out in three road vector signal sources respectively.
In the embodiment of the invention; For realizing highly purified simulation signal generator; Adopted simulation signal generator and the vector signal source circuit mode of independent design separately; The main circuit of simulation signal generator is concentrated in the analog signal generation module, accomplish conditioning, comprise links such as mixing, filtering, amplification, automatic electric-level control simulation signal generator through the analog signal generation module.
The analog signal generation module is used for the generation of simulation signal generator and filtering, and the analog signal generation module is as selecting plug-in unit for use in the embodiment of the invention, and when needs produced simulation signal generator, local oscillation signal output was through the analog signal generation module.In the time only need producing the vector signal source, local oscillation signal is without preselector, by the direct output vector signal of up-conversion module.
The analog signal generation module is accepted the local oscillation signal that is higher than a pre-set threshold value from the local oscillator module; For example pre-set threshold value is made as 2GHz; This local oscillation signal is made as 2～26.5GHz; This local oscillation signal and AM signal independently or FM signal carry out filtering through tuned filter, to reach the purpose that suppresses spuious raising spectral purity again after the first frequency mixer mixing.By amplifier filtered signal is amplified then, obtain one tunnel analog signal.Local oscillation signal less than 2GHz carries out mixing at the output signal of second frequency mixer and amplifier, obtains another road analog signal.This two-way analog signal is spliced into the analog signal of 1MHz～26.5GHz through switch.For improving the analog signal source quality, the same ALC control loop that adopts separately.In the present embodiment, pre-set threshold value also can be as required confirms arbitrarily, for example 1GHz, 3GHz, 5GHz, 8GHz, or the like.
The analog signal that the analog signal generation module generates can get into the up-conversion module, gets into switch jointly with each road vector signal, switches through switch and selects still analog signal output of vector signal output.By this method, effectively reduced the volume of device hardware.
In the embodiment of the invention; The microwave signal generating apparatus is based on PXIE (PCI Express extensions for instrument; The expansion of PCI Express in instrument field) framework, and through adopting IVI (Interchangeable Virtual Instruments, The interchangeable virtual instruments) function and driver of modules; The software of each module is carried out standardization; Make module adopt identical function just can use, except that parameter attribute, need not upgrade instrument software with same-interface relation.
The present invention has adopted FPGA (Field Programmable Gate Array in hardware designs; Field programmable gate array), DSP (Digital Signal Processing; Digital Signal Processing) programming device such as; Can with each bottom software through the bus form dynamic load in FPGA, realize various signals generation function, reach under unified hardware environment the function of reshuffling to instrument.
Although be the example purpose, the preferred embodiments of the present invention are disclosed, it also is possible those skilled in the art will recognize various improvement, increase and replacement, therefore, scope of the present invention should be not limited to the foregoing description.
Claims (10)
Hide Dependent
translated from
Claims (10)
Hide Dependent
translated from
1. a microwave signal generating apparatus is characterized in that, comprising:
Base band sources is used to produce baseband signal;
The local oscillator module is used to produce local oscillation signal;
The up-conversion module is used for accomplishing the quadrature modulation process according to said baseband signal and said local oscillation signal, obtains vector signal;
Said up-conversion module comprises the quadrature modulator that is in different frequency range more than two.
2. microwave signal generating apparatus as claimed in claim 1 is characterized in that, the digital modulation type of said baseband signal is one of following type:
Amplitude modulation, frequency modulation, amplitude shift keying, frequency shift keying, biphase phase shift keying, QPSK, 16QAM and 64QAM.
3. microwave signal generating apparatus as claimed in claim 2 is characterized in that, said baseband signal is the quadrature up-conversion signal of difference.
4. microwave signal generating apparatus as claimed in claim 1 is characterized in that, the way of said local oscillation signal equals the number of said quadrature modulator.
5. microwave signal generating apparatus as claimed in claim 1 is characterized in that, said local oscillator module also is used for clock signal is exported to said up-conversion module, and said up-conversion module also is used for exporting said clock signal to said base band sources.
6. microwave signal generating apparatus as claimed in claim 1 is characterized in that, the said quadrature modulator that is in different frequency range more than two, and its frequency range is continuous each other.
7. like each described microwave signal generating apparatus in the claim 1 to 6, it is characterized in that, also comprise the analog signal generation module, the local oscillation signal that this analog signal generation module is used for providing according to said local oscillator module generates analog signal.
8. microwave signal generating apparatus as claimed in claim 7 is characterized in that, said analog signal generation module comprises first frequency mixer and filter; Wherein, the frequency that said first frequency mixer is used to receive said local oscillator module and provides is higher than the local oscillation signal of a pre-set threshold value, with independently amplitude-modulated signal or FM signal carry out mixing; Said filter is used for the signal of said first frequency mixer output is carried out filtering.
9. microwave signal generating apparatus as claimed in claim 8 is characterized in that, said analog signal generation module also comprises amplifier, and this amplifier is used for the signal of said filter output is amplified.
10. microwave signal generating apparatus as claimed in claim 9; It is characterized in that; Said analog signal generation module also comprises second frequency mixer; The frequency that this second frequency mixer is used to receive said local oscillator module and provides is lower than the local oscillation signal of said pre-set threshold value, carries out mixing with the output signal of said amplifier.