CN104993887A - Integrated pulse state noise factor test method and tester - Google Patents
Integrated pulse state noise factor test method and tester Download PDFInfo
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Abstract
The invention relates to the test technical field, concretely an integrated pulse state noise factor test method and tester. The method comprises: in dependence on the standard presetting of a tested workpiece, a pulse signal generator module outputting a first path of pulse bias signals to the tested workpiece for the switching of the tested workpiece; the pulse signal generator module meanwhile generating a second path of pulse trigger signals used for the triggering of a noise receiver and the synchronous switching of noise sources, wherein the second path of pulse trigger signals and the first path of pulse bias signals are synchronous; and under the control and synchronization of two paths of pulse signals, the tester working together with the tested workpiece in a time gating mode to test output signals of the tested workpiece in an opening phase. The method employs an integrated structure design, and solves the problems of large size, high price, complex connection and low reliability of a present test system composed of a plurality of devices and instruments.
Description
Technical field
The present invention relates to technical field of measurement and test, be specifically related to a kind of integrated pulse condition noise factor method of testing and tester.
Background technology
Under the low-noise receiver system, subsystem, assembly etc. in the fields such as current radar, communication are operated in pulse condition mostly, noise factor, as an important technology index of low-noise receiver system, must be tested under its pulsed operation state.Highly sensitive receiver can reduce the transmitting power of transmitter, reduce transmitting power mean can adopt more small dimension, the power amplifier of less power output, less antenna and lower cost, so the noise factor accurately under measuring receiver system pulses operating state has extremely important effect for electronic communication field Optimized System Design under pulse regime.
The current frequency range of domestic integrated noise figure meter device covers 10MHz-40GHz, and is only applicable to the noise-factor measurement of measured piece under non-stop run state, can not carry out the noise-factor measurement of measured piece under pulse condition.
External from state, necessary instrument is provided by Agilent company of the U.S., AURIGA company carries out the system integration and the research of pulse condition noise coefficient measuring method, develop AU13000 series comprehensive Noise Factor Analyzer (SNFA), noise factor test macro under the separated type pulse state that AURIGA company provides, achieves the measurement of the noise factor of microwave and millimeter wave low-noise device pulsed operation state.System comprises VXI network parameter test module, signal generator, signal processor and solid-state noise source etc.The technical merit reached at present is: can provide in 50MHz ~ 50GHz frequency coverage minimum pulse width be 1 μ S impulsive noise coefficient measure.
Except AURIGA company of the U.S., German RS company also provides pulse condition noise factor test Solution.RS company is plus noise coefficient test option on the basis of spectrum analyzer, by joining the noise-factor measurement that function or pulse signal generator realize under pulse mode outward.Function or pulse generator provide pulsed bias signal, and pulse duty factor is determined by measured piece testing standard, and function or pulse generator also provide the start pulse signal synchronous with amplifier biasing to spectrum analyzer simultaneously.
Existing pulse condition noise factor test macro mainly contains following shortcoming:
(1) need multiple stage instrument, system connection complexity, reliability is low, cost is high, testing efficiency is low.
(2) frequency range is up to 50GHz, can not carry out the measurement of higher frequency measured piece.
(3) system sensitivity is not high, and measuring accuracy is poor.
Summary of the invention
For the defect that prior art exists, the object of the present invention is to provide integrated pulse condition noise figure meter with bulky, cost intensive, the connection complexity that solve that the test macro that multiple devices, instrument need be used forms at present brings, problem that reliability is low.
For reaching above-mentioned purpose, on the one hand, the invention provides a kind of integrated pulse condition noise figure meter, comprising:
Broadband noise receiver module, clock reference module, pulse signal generator module, main control computer module, system software module and power module;
Wherein, described broadband noise receiver module, for receiving the radiofrequency signal to be measured of 10MHz-67GHz, and region filtering, low noise amplification and down-conversion being carried out to it, after digitized processing is carried out to the intermediate-freuqncy signal after frequency conversion, sending to main control computer module by system bus;
Described clock reference module connects described broadband noise receiver module and described pulse signal generator module respectively, for produce for the phase-locked local oscillator of broadband noise receiver module and pulse signal the reference of high stable is provided time base;
Described pulse signal generator module is used for providing two-way synchronization pulse simultaneously, and its minimum pulse width is 1 μ S, and a road is used for the biased input of measured piece, is used for simulating the actual working state of measured piece; Another road is as the synchronous triggering signal of test;
Described main control computer module, connects other modules of this tester by bus, complete control to whole system, the process of the impulse noise signal received to achieve a butt joint for being called described system software module by bus;
Described system software module and described main control computer model calling, call for described main control computer module;
Described power module is used for providing reliable and stable DC power supply for all hardware modules.
Further, described broadband noise receiver module comprises:
Microwave and millimeter wave switch module, radiofrequency signal preliminary treatment submodule, radio frequency preamplifiers, RF up-converter circuit, broadband local oscillator synthon module, microwave preamplifier, millimeter wave preamplifier, mixing and filtering assembly, broadband down conversion components and intermediate frequency process module; Wherein,
Described microwave and millimeter wave switch module, for the radiofrequency signal to be measured of the described 10MHz-67GHz received is divided into radiofrequency signal, microwave signal and millimeter-wave signal, corresponding 10MHz-4GHz, 4GHz-50GHz and 50GHz-67GHz tri-frequency ranges, access described radiofrequency signal preliminary treatment submodule, microwave preamplifier and millimeter wave preamplifier respectively respectively;
Described radiofrequency signal preliminary treatment submodule, comprises matching attenuation network, low pass filter; Described matching attenuation network is used for described radiofrequency signal to decay; Described low pass filter filtering is used for carrying out low-pass filtering to described radiofrequency signal;
Described radio frequency preamplifiers is used for the radiofrequency signal after to decay, low-pass filtering and amplifies, and exports described RF up-converter circuit to;
Described RF up-converter circuit comprises radio-frequency-up-converter and the first frequency mixer; This radio-frequency-up-converter is connected with described broadband local oscillator synthon module, for stating the first intermediate frequency that radiofrequency signal and corresponding local oscillator up-convert to 3.9214GHz after amplifying; Described first frequency mixer, for down-converting to the intermediate frequency of 321.4MHz by described first intermediate frequency and corresponding local oscillator;
Described microwave preamplifier is used for described microwave signal to amplify;
Described millimeter wave preamplifier is used for the millimeter-wave signal of described 50GHz ~ 67GHz frequency range to amplify;
Described broadband down conversion components comprises band pass filter and three-mixer; This band pass filter is used for the millimeter-wave signal after to amplification to carry out bandpass filtering and suppresses image response; Described three-mixer adopts the mixing scheme of high intermediate frequency, is that 4.5GHz ~ 18GHz intermediate frequency exports for filtered millimeter-wave signal is produced frequency range with 4 subharmonic phase mixing of the first local oscillation signal;
Described mixing and filtering assembly comprises tracking filter and the second frequency mixer, and this second frequency mixer is connected with broadband local oscillator synthon module; Mixing and filtering assembly is connected with described microwave preamplifier or described broadband down conversion components by switch;
When described mixing and filtering assembly is connected with microwave preamplifier, described tracking filter is used for the microwave signal after by amplification and carries out tracking filter; Described second frequency mixer is used for the first local oscillation signal fundamental wave mixing filtered microwave signal and described broadband local oscillator synthon module produced, and generates second intermediate-freuqncy signal of 321.4MHz;
When described mixing and filtering assembly is connected with described broadband down conversion components, described tracking filter is used for the intermediate frequency of millimere-wave band to export to carry out tracking filter; Described second frequency mixer is used for the 3rd intermediate-freuqncy signal the first local oscillation signal fundamental wave mixing that filtered signal and described broadband local oscillator synthon module produce being generated 321.4MHz;
Described intermediate frequency process module is connected with described RF up-converter circuit or described mixing and filtering assembly by switch, and the intermediate-freuqncy signal for the radio frequency to access, microwave or millimere-wave band is carried out digitized processing and exports described main control computer module to.
Further, described clock reference module is made up of the constant-temperature crystal oscillator of high stable and phase lock circuitry.
Further, described pulse signal generator module comprises pulse signal generating circuit and pulse signal modulate circuit;
Described two-way synchronization pulse adopts programming device to realize, can be synchronous in frequency, can independent regulation in amplitude.
Further, described main control computer module comprises CPU, hard disk, internal memory, display unit and the imput output circuit for man-machine interaction.
Further, the running environment of described system software module adopts embedded Windows operating system, and operation adopts the mode of Chinese drop-down and pop-up menu and shortcut icon, and system also supports QWERTY keyboard and the mouse of plug and play; Software for Design supports general-purpose interface bus GPIB, USB interface, Ethernet interface;
This system software module comprises the program controlled all hardware circuit, enables each hardware circuit realize specific measurement function, has the functions such as Autonomous test, self calibration, self-adjusting and program control operation simultaneously.
On the other hand, the invention provides a kind of integrated pulse condition noise factor method of testing, comprising:
Pulse signal generator module is used for the switch of measured piece to measured piece according to the working stamndard of measured piece preset output first via pulsed bias signal;
This pulse signal generator module produces the second road pulse triggering signal simultaneously, for the triggering of noise receiver and the synchro switch of noise source; This second road pulse triggering signal is synchronous with described first via pulsed bias signal;
This two pulse signals control and synchronous under, tester is operated in time gated pattern with measured piece, surveys the output signal of described measured piece opening stage.
Further, the output signal that described measured piece opening stage surveyed by described tester specifically comprises:
When described measured piece is opened, obtain by rf inputs mouth the radiofrequency signal to be measured that this measured piece exports under the excitation of noise source;
Region filtering is carried out to this radiofrequency signal to be measured;
Inputed to the frequency mixer of corresponding wave band by each band signal after switching over, region filtering, carry out down-conversion with corresponding local oscillation signal, the intermediate-freuqncy signal after down-conversion is exported;
To the intermediate-freuqncy signal of described output after preliminary treatment and digitized processing, send to main control computer by system bus;
Master control calculates by calling system software, calculates noise factor and the gain of described measured piece, and shows with the form that user needs.
The present invention can reach following beneficial effect:
Produce pulse control signal by built-in pulse generator and pulse synchronous signal integration completes the test of pulse condition noise factor, solve the test macro that multiple devices, instrument need be used forms at present and bring bulky, cost intensive, connection complexity, problem that reliability is low; Frequency range covers 10MHz-67GHz, and adaptability is wider; Inner ultra broadband noise receiver can realize once connecting the automatic measurement that just can complete 10MHz-67GHz pulse condition noise factor; Adopt region filtering, segmentation low noise amplification, segmentation mixing, inhibit image response, the single-side belt achieving pulse condition noise factor is measured; Adopt special pulse condition noise factor test high sensitive receiver; The inner preset wideband low noise preamplifier of receiver, improves the sensitivity of tester.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structure chart of the integrated pulse condition noise figure meter of embodiment one;
Fig. 2 is the structural representation of the broadband noise receiver module 101 of embodiment one;
Fig. 3 is the flow chart of embodiment two integrated pulse condition noise factor method of testing;
Fig. 4 is in embodiment two, the specific works flow process schematic diagram of step 303.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
For the defect that prior art exists, the object of the present invention is to provide a kind of integrated frequency coverage 10MHz-67GHz pulse condition noise figure meter, volume is little, cost is low, system configuration is succinct, once connect the noise-factor measurement that just automatically can complete measured piece pulse condition, measurement sensitivity is high, testing cost is low, and testing efficiency is high, and because level of integrated system is high, reliability improves greatly.
Below by instantiation, the present invention is further explained:
Embodiment one
Fig. 1 is the structure chart of the present embodiment integration pulse condition noise figure meter, comprising:
Broadband noise receiver module 101, clock reference module 102, pulse signal generator module 103, main control computer module 104, system software module 105 and power module 106;
Wherein, broadband noise receiver module 101, for receiving the radiofrequency signal to be measured of 10MHz-67GHz, and region filtering, low noise amplification and down-conversion being carried out to it, after digitized processing is carried out to the intermediate-freuqncy signal after frequency conversion, sending to main control computer module by system bus;
Clock reference module 102, connects broadband noise receiver module 101 and pulse signal generator module 103 respectively, for produce for the phase-locked local oscillator of broadband noise receiver module 101 and pulse signal the reference of high stable is provided time base;
Pulse signal generator module 103, for providing two-way synchronization pulse simultaneously, its minimum pulse width is 1 μ S, and a road is used for the biased input of measured piece, is used for simulating the actual working state of measured piece; Another road is as the synchronous triggering signal of test;
Main control computer module 104, connects other modules of this tester by bus, for being completed the control to whole system by bus calling system software module 105, the process of the impulse noise signal received to achieve a butt joint;
System software module 105 is connected with main control computer module 104, calls for main control computer module 104;
Power supply mould 106 pieces is for providing reliable and stable DC power supply for all hardware modules.
Further, as shown in Figure 2, be the structural representation of the present embodiment broadband noise receiver module 101, comprise:
Microwave and millimeter wave switch module 201, radiofrequency signal preliminary treatment submodule 202, radio frequency preamplifiers 203, RF up-converter circuit 204, broadband local oscillator synthon module 205, microwave preamplifier 206, millimeter wave preamplifier 207, mixing and filtering assembly 208, broadband down conversion components 209, intermediate frequency process module 210;
Wherein,
Microwave and millimeter wave switch module 201, for the radiofrequency signal to be measured of the 10MHz-67GHz received is divided into radiofrequency signal, microwave signal and millimeter-wave signal, corresponding 10MHz-4GHz, 4GHz-50GHz and 50GHz-67GHz tri-frequency ranges respectively, respectively incoming radio frequency signal preliminary treatment submodule 202, microwave preamplifier 206 and millimeter wave preamplifier 207;
Radiofrequency signal preliminary treatment submodule 202, comprises matching attenuation network, low pass filter; Matching attenuation network is used for radiofrequency signal to decay; Low pass filter filtering is used for radio frequency signal and carries out low-pass filtering;
Radio frequency preamplifiers 203, for amplifying the radiofrequency signal after decay, low-pass filtering, and exports RF up-converter circuit 204 to;
RF up-converter circuit 204, comprises radio-frequency-up-converter and the first frequency mixer; This radio-frequency-up-converter is connected with broadband local oscillator synthon module 205, for the described radiofrequency signal after amplification and corresponding local oscillator being up-converted to first intermediate frequency of 3.9214GHz; First frequency mixer, for down-converting to the intermediate frequency of 321.4MHz by the first intermediate frequency and corresponding local oscillator;
Microwave preamplifier 206, for amplifying microwave signal;
Millimeter wave preamplifier 207, for amplifying the millimeter-wave signal of 50GHz ~ 67GHz frequency range;
Mixing and filtering assembly 208, comprises tracking filter and the second frequency mixer, and this second frequency mixer is connected with broadband local oscillator synthon module 205; Mixing and filtering assembly 208 is connected with microwave preamplifier 206 or broadband down conversion components 209 by switch;
When mixing and filtering assembly is connected with microwave preamplifier 206, tracking filter is used for the microwave signal after by amplification and carries out tracking filter; Second frequency mixer is used for the first local oscillation signal fundamental wave mixing filtered microwave signal and broadband local oscillator synthon module produced, and generates second intermediate-freuqncy signal of 321.4MHz;
When mixing and filtering assembly is connected with broadband down conversion components 209, tracking filter is used for the intermediate frequency of millimere-wave band to export to carry out tracking filter; Second frequency mixer is used for the 3rd intermediate-freuqncy signal the first local oscillation signal fundamental wave mixing that filtered signal and broadband local oscillator synthon module produce being generated 321.4MHz;
Broadband down conversion components 209, comprises band pass filter and three-mixer; This band pass filter is used for the millimeter-wave signal after to amplification to carry out bandpass filtering and suppresses image response; Three-mixer adopts the mixing scheme of high intermediate frequency, is that 4.5GHz ~ 18GHz intermediate frequency exports for filtered millimeter-wave signal is produced frequency range with 4 subharmonic phase mixing of the first local oscillation signal;
Intermediate frequency process module 210 is connected with RF up-converter circuit 204 or mixing and filtering assembly 208 by switch, and the intermediate-freuqncy signal for the radio frequency to access, microwave or millimere-wave band is carried out digitized processing and exports main control computer module 104 to.
Further, clock reference module 102 is made up of the constant-temperature crystal oscillator of high stable and phase lock circuitry;
Further, pulse signal generator module 103 comprises pulse signal generating circuit and pulse signal modulate circuit;
Two-way synchronization pulse adopts programming device to realize, can be synchronous in frequency, can independent regulation in amplitude.
Further, main control computer module 104 comprises CPU, hard disk, internal memory, display unit and the imput output circuit for man-machine interaction.
Further, the running environment of system software module 105 adopts embedded Windows operating system, and operation adopts the mode of Chinese drop-down and pop-up menu and shortcut icon, and system also supports QWERTY keyboard and the mouse of plug and play; Software for Design supports general-purpose interface bus GPIB, USB interface, Ethernet interface;
This system software module 105 comprises the program controlled all hardware circuit, enables each hardware circuit realize specific measurement function, has the functions such as Autonomous test, self calibration, self-adjusting and program control operation simultaneously.
Embodiment two
Fig. 3 is the flow chart of the present embodiment integration pulse condition noise factor method of testing, comprising:
Step 301, pulse signal generator module is used for the switch of measured piece to measured piece according to the working stamndard of measured piece preset output first via pulsed bias signal;
Step 302, this pulse signal generator module produces the second road pulse triggering signal simultaneously, for the triggering of noise receiver and the synchro switch of noise source; This second road pulse triggering signal is synchronous with first via pulsed bias signal;
Step 303, this two pulse signals control and synchronous under, tester is operated in time gated pattern with measured piece, surveys the output signal of measured piece opening stage.
Fig. 4 is the specific works flow process schematic diagram of step 303, and as shown in the figure, further, step 303 specifically comprises:
Step 3031, when measured piece is opened, obtains by rf inputs mouth the radiofrequency signal to be measured that this measured piece exports under the excitation of noise source;
Step 3032, carries out region filtering to this radiofrequency signal to be measured;
Step 3033, is inputed to the frequency mixer of corresponding wave band, carries out down-conversion with corresponding local oscillation signal by each band signal after switching over, region filtering, the intermediate-freuqncy signal after down-conversion exported;
Step 3034, to the intermediate-freuqncy signal exported after preliminary treatment and digitized processing, sends to main control computer by system bus;
Further, also comprise:
Step 3035, master control calculates by calling system software, calculates noise factor and the gain of measured piece, and shows with the form that user needs.
By above-described embodiment, the present invention can reach following beneficial effect:
Produce pulse control signal by built-in pulse generator and pulse synchronous signal integration completes the test of pulse condition noise factor, solve the test macro that multiple devices, instrument need be used forms at present and bring bulky, cost intensive, connection complexity, problem that reliability is low; Frequency range covers 10MHz-67GHz, and adaptability is wider; Inner ultra broadband noise receiver can realize once connecting the automatic measurement that just can complete 10MHz-67GHz pulse condition noise factor; Adopt region filtering, segmentation low noise amplification, segmentation mixing, inhibit image response, the single-side belt achieving pulse condition noise factor is measured; Adopt special pulse condition noise factor test high sensitive receiver; The inner preset wideband low noise preamplifier of receiver, improves the sensitivity of tester.
Those skilled in the art can also recognize the various illustrative components, blocks (illustrativelogical block) that the embodiment of the present invention is listed, unit, and step can pass through electronic hardware, computer software, or both combinations realize.For the replaceability (interchangeability) of clear displaying hardware and software, above-mentioned various illustrative components (illustrativecomponents), unit and step have universally described their function.Such function is the designing requirement realizing depending on specific application and whole system by hardware or software.Those skilled in the art for often kind of specifically application, can use the function described in the realization of various method, but this realization can should not be understood to the scope exceeding embodiment of the present invention protection.
Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only the specific embodiment of the present invention; the protection range be not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. an integrated pulse condition noise figure meter, is characterized in that, comprising:
Broadband noise receiver module, clock reference module, pulse signal generator module, main control computer module, system software module and power module;
Wherein, described broadband noise receiver module, for receiving the radiofrequency signal to be measured of 10MHz-67GHz, and region filtering, low noise amplification and down-conversion being carried out to it, after digitized processing is carried out to the intermediate-freuqncy signal after frequency conversion, sending to main control computer module by system bus;
Described clock reference module connects described broadband noise receiver module and described pulse signal generator module respectively, for produce for the phase-locked local oscillator of broadband noise receiver module and pulse signal the reference of high stable is provided time base;
Described pulse signal generator module is used for providing two-way synchronization pulse simultaneously, and its minimum pulse width is 1 μ S, and a road is used for the biased input of measured piece, is used for simulating the actual working state of measured piece; Another road is as the synchronous triggering signal of test;
Described main control computer module, connects other modules of this tester by bus, complete control to whole system, the process of the impulse noise signal received to achieve a butt joint for being called described system software module by bus;
Described system software module and described main control computer model calling, call for described main control computer module;
Described power module is used for providing reliable and stable DC power supply for all hardware modules.
2. tester according to claim 1, is characterized in that, described broadband noise receiver module comprises:
Microwave and millimeter wave switch module, radiofrequency signal preliminary treatment submodule, radio frequency preamplifiers, RF up-converter circuit, broadband local oscillator synthon module, microwave preamplifier, millimeter wave preamplifier, mixing and filtering assembly, broadband down conversion components and intermediate frequency process module; Wherein,
Described microwave and millimeter wave switch module, for the radiofrequency signal to be measured of the described 10MHz-67GHz received is divided into radiofrequency signal, microwave signal and millimeter-wave signal, corresponding 10MHz-4GHz, 4GHz-50GHz and 50GHz-67GHz tri-frequency ranges, access described radiofrequency signal preliminary treatment submodule, microwave preamplifier and millimeter wave preamplifier respectively respectively;
Described radiofrequency signal preliminary treatment submodule, comprises matching attenuation network, low pass filter; Described matching attenuation network is used for described radiofrequency signal to decay; Described low pass filter filtering is used for carrying out low-pass filtering to described radiofrequency signal;
Described radio frequency preamplifiers is used for the radiofrequency signal after to decay, low-pass filtering and amplifies, and exports described RF up-converter circuit to;
Described RF up-converter circuit comprises radio-frequency-up-converter and the first frequency mixer; This radio-frequency-up-converter is connected with described broadband local oscillator synthon module, for the described radiofrequency signal after amplification and corresponding local oscillator being up-converted to first intermediate frequency of 3.9214GHz; Described first frequency mixer, for down-converting to the intermediate frequency of 321.4MHz by described first intermediate frequency and corresponding local oscillator;
Described microwave preamplifier is used for described microwave signal to amplify;
Described millimeter wave preamplifier is used for the millimeter-wave signal of described 50GHz ~ 67GHz frequency range to amplify;
Described broadband down conversion components comprises band pass filter and three-mixer; This band pass filter is used for the millimeter-wave signal after to amplification to carry out bandpass filtering and suppresses image response; Described three-mixer adopts the mixing scheme of high intermediate frequency, is that 4.5GHz ~ 18GHz intermediate frequency exports for filtered millimeter-wave signal is produced frequency range with 4 subharmonic phase mixing of the first local oscillation signal;
Described mixing and filtering assembly comprises tracking filter and the second frequency mixer, and this second frequency mixer is connected with broadband local oscillator synthon module; Mixing and filtering assembly is connected with described microwave preamplifier or described broadband down conversion components by switch;
When described mixing and filtering assembly is connected with microwave preamplifier, described tracking filter is used for microwave signal after amplification to carry out tracking filter; Described second frequency mixer is used for the first local oscillation signal fundamental wave mixing filtered microwave signal and described broadband local oscillator synthon module produced, and generates second intermediate-freuqncy signal of 321.4MHz;
When described mixing and filtering assembly is connected with described broadband down conversion components, described tracking filter is used for the intermediate frequency of millimere-wave band to export to carry out tracking filter; Described second frequency mixer is used for the 3rd intermediate-freuqncy signal the first local oscillation signal fundamental wave mixing that filtered signal and described broadband local oscillator synthon module produce being generated 321.4MHz;
Described intermediate frequency process module is connected with described RF up-converter circuit or described mixing and filtering assembly by switch, and the intermediate-freuqncy signal for the radio frequency to access, microwave or millimere-wave band is carried out digitized processing and exports described main control computer module to.
3. tester according to claim 1, is characterized in that, described clock reference module is made up of the constant-temperature crystal oscillator of high stable and phase lock circuitry.
4. tester according to claim 1, is characterized in that, described pulse signal generator module comprises pulse signal generating circuit and pulse signal modulate circuit.
Described two-way synchronization pulse adopts programming device to realize, can be synchronous in frequency, can independent regulation in amplitude.
5. tester according to claim 1, is characterized in that, described main control computer module comprises CPU, hard disk, internal memory, display unit and the imput output circuit for man-machine interaction.
6. tester according to claim 1, it is characterized in that, the running environment of described system software module adopts embedded Windows operating system, and operation adopts the mode of Chinese drop-down and pop-up menu and shortcut icon, and system also supports QWERTY keyboard and the mouse of plug and play; Software for Design supports general-purpose interface bus GPIB, USB interface, Ethernet interface;
This system software module comprises the program controlled all hardware circuit, enables each hardware circuit realize specific measurement function, has the functions such as Autonomous test, self calibration, self-adjusting and program control operation simultaneously.
7. an integrated pulse condition noise factor method of testing, is characterized in that, comprising:
Pulse signal generator module is used for the switch of measured piece to measured piece according to the working stamndard of measured piece preset output first via pulsed bias signal;
This pulse signal generator module produces the second road pulse triggering signal simultaneously, for the triggering of noise receiver and the synchro switch of noise source; This second road pulse triggering signal is synchronous with described first via pulsed bias signal;
This two pulse signals control and synchronous under, tester is operated in time gated pattern with measured piece, surveys the output signal of described measured piece opening stage.
8. method according to claim 7, is characterized in that, the output signal that described measured piece opening stage surveyed by described tester specifically comprises:
When described measured piece is opened, obtain by rf inputs mouth the radiofrequency signal to be measured that this measured piece exports under the excitation of noise source;
Region filtering is carried out to this radiofrequency signal to be measured;
Inputed to the frequency mixer of corresponding wave band by each band signal after switching over, region filtering, carry out down-conversion with corresponding local oscillation signal, the intermediate-freuqncy signal after down-conversion is exported;
To the intermediate-freuqncy signal of described output after preliminary treatment and digitized processing, send to main control computer by system bus;
Master control calculates by calling system software, calculates noise factor and the gain of described measured piece, and shows with the form that user needs.
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| CN107045119A (en) * | 2017-04-26 | 2017-08-15 | 北京无线电测量研究所 | A kind of airboarne receiver Auto-Test System |
| CN107276695A (en) * | 2017-06-07 | 2017-10-20 | 中国电子科技集团公司第四十研究所 | A kind of noise coefficient scanning survey method |
| CN107576846A (en) * | 2017-08-25 | 2018-01-12 | 中国电子科技集团公司第四十研究所 | A kind of High Precise Frequency Measurement System and method based on sampling frequency-changing technology |
| CN108802510A (en) * | 2018-06-08 | 2018-11-13 | 中国电子科技集团公司第四十研究所 | integrated noise parameter measuring device and measuring method |
| CN109861646A (en) * | 2018-12-29 | 2019-06-07 | 北京航天测控技术有限公司 | A kind of broadband millimeter-wave up-conversion method |
| CN110333398A (en) * | 2019-07-10 | 2019-10-15 | 北京航空航天大学 | A kind of noise threshold calculation method of electromagnetic spectrum |
| CN110823961A (en) * | 2019-11-29 | 2020-02-21 | 黑龙江工程学院 | Rock-soil nondestructive testing system and method applying pulse echo flaw detection |
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| CN107276695B (en) * | 2017-06-07 | 2020-09-18 | 中国电子科技集团公司第四十一研究所 | Noise coefficient scanning and measuring method |
| CN107576846A (en) * | 2017-08-25 | 2018-01-12 | 中国电子科技集团公司第四十研究所 | A kind of High Precise Frequency Measurement System and method based on sampling frequency-changing technology |
| CN108802510A (en) * | 2018-06-08 | 2018-11-13 | 中国电子科技集团公司第四十研究所 | integrated noise parameter measuring device and measuring method |
| CN108802510B (en) * | 2018-06-08 | 2020-06-09 | 中国电子科技集团公司第四十一研究所 | Integrated noise parameter measuring device and measuring method |
| CN109861646A (en) * | 2018-12-29 | 2019-06-07 | 北京航天测控技术有限公司 | A kind of broadband millimeter-wave up-conversion method |
| CN109861646B (en) * | 2018-12-29 | 2022-11-25 | 北京航天测控技术有限公司 | Broadband millimeter wave up-conversion method |
| CN110333398A (en) * | 2019-07-10 | 2019-10-15 | 北京航空航天大学 | A kind of noise threshold calculation method of electromagnetic spectrum |
| CN110823961A (en) * | 2019-11-29 | 2020-02-21 | 黑龙江工程学院 | Rock-soil nondestructive testing system and method applying pulse echo flaw detection |
| CN112530825A (en) * | 2020-11-26 | 2021-03-19 | 中国科学院上海微系统与信息技术研究所 | On-chip multi-parameter measuring device |
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