CN104993887B - Integrated pulse condition noise coefficient method of testing and tester - Google Patents
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Abstract
The present invention relates to technical field of measurement and test, more particularly to a kind of integrated pulse condition noise coefficient method of testing and tester, its method includes, and pulse signal generator module gives switch of the measured piece for measured piece according to the preset first via pulsed bias signal that exports of working stamndard of measured piece；The 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；The second road pulse triggering signal is synchronous with the first via pulsed bias signal；Under the control and synchronization of the two pulse signals, tester is operated in time gated pattern with measured piece, measures the output signal of the measured piece opening stage；This method uses integrated structure design, and the test system for solving the problems, such as at present multiple devices, instrument need to be used to form brings bulky, costly, connection complexity, reliability low.
Description
Technical Field
The invention relates to the technical field of testing, in particular to an integrated pulse state noise coefficient testing method and an integrated pulse state noise coefficient tester.
Background
At present, low noise receiver systems, subsystems, components and the like in the fields of radar, communication and the like mostly work in an impulse state, and a noise coefficient is taken as an important technical index of the low noise receiver system and must be tested in the impulse working state. The high-sensitivity receiver can reduce the transmitting power of the transmitter, and the reduction of the transmitting power means that a power amplifier with smaller specification and smaller output power, a smaller antenna and lower cost can be adopted, so that the accurate measurement of the noise coefficient of the receiver system in the pulse working state plays an extremely important role in the system optimization design in the electronic communication field under the pulse system.
The domestic integrated noise coefficient test instrument covers 10MHz-40GHz at present, is only suitable for measuring the noise coefficient of a tested piece under the uninterrupted working state, and cannot measure the noise coefficient of the tested piece under the pulse state.
From abroad, a matched instrument is provided by Agilent, Inc. in America, AURIGA is used for researching system integration and a pulse state noise coefficient measuring method, an AU13000 series comprehensive noise coefficient analyzer (SNFA) is developed, and a split type noise coefficient testing system under a pulse state provided by AURIGA realizes the measurement of the noise coefficient of a microwave millimeter wave low-noise device under a pulse working state. The system comprises a VXI network parameter testing module, a signal generator, a signal processor, a solid-state noise source and the like. The current technical level is: the impulse noise coefficient measurement with the minimum impulse width of 1 mu S can be provided in the frequency coverage range of 50MHz to 50 GHz.
In addition to AURIGA, Germany, RS provides a pulse State noise figure test solution. The RS company adds a noise coefficient test option on the basis of a spectrum analyzer, and realizes noise coefficient measurement in a pulse mode through an external function or a pulse signal generator. The function or pulse generator provides a pulse bias signal, the pulse duty ratio is determined by the tested piece testing standard, and the function or pulse generator also provides a trigger pulse signal synchronous with the amplifier bias to the spectrum analyzer.
The existing pulse state noise coefficient test system mainly has the following defects:
(1) the system has the advantages of complex connection, low reliability, high cost and low test efficiency due to the requirement of a plurality of instruments.
(2) The frequency range is up to 50GHz and measurements of higher frequency test pieces cannot be made.
(3) The system sensitivity is not high, and the test precision is poor.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an integrated pulse state noise coefficient tester to solve the problems of large volume, high cost, complex connection and low reliability caused by a test system consisting of a plurality of devices and instruments.
To achieve the above object, in one aspect, the present invention provides an integrated pulse state noise figure tester, including:
the system comprises a broadband noise receiver module, a clock reference module, a pulse signal generator module, a main control computer module, a system software module and a power supply module;
the broadband noise receiver module is used for receiving a radio frequency signal to be detected of 10MHz-67GHz, performing segmented filtering, low-noise amplification and down-conversion on the radio frequency signal, and sending a frequency-converted intermediate frequency signal to the main control computer module through a system bus after the frequency-converted intermediate frequency signal is subjected to digital processing;
the clock reference module is respectively connected with the broadband noise receiver module and the pulse signal generator module and is used for providing a high-stability reference time base for the generation of a phase-locked local oscillator of the broadband noise receiver module and the generation of a pulse signal;
the pulse signal generator module is used for simultaneously providing two paths of synchronous pulse signals, the minimum pulse width of the synchronous pulse signals is 1 mu S, and one path of synchronous pulse signals is used for providing bias input for a tested piece and is used for simulating the actual working state of the tested piece; the other path is used as a synchronous trigger signal for testing;
the main control computer module is connected with other modules of the tester through a bus and used for calling the system software module through the bus to complete the control of the whole system so as to realize the processing of the received pulse noise signal;
the system software module is connected with the main control computer module and is called by the main control computer module;
the power supply module is used for providing a reliable and stable direct current power supply for all the hardware modules.
Further, the wideband noise receiver module comprises:
the device comprises a microwave millimeter wave switch component, a radio frequency signal preprocessing submodule, a radio frequency preamplifier, a radio frequency up-conversion circuit, a broadband local oscillator synthesis submodule, a microwave preamplifier, a millimeter wave preamplifier, a mixing filter component, a broadband down-conversion component and an intermediate frequency processing module; wherein,
the microwave and millimeter wave switch component is used for dividing the received radio frequency signal to be detected of 10MHz-67GHz into a radio frequency signal, a microwave signal and a millimeter wave signal, respectively corresponding to three frequency bands of 10MHz-4GHz, 4GHz-50GHz and 50GHz-67GHz, and respectively accessing the radio frequency signal preprocessing submodule, the microwave preamplifier and the millimeter wave preamplifier;
the radio frequency signal preprocessing submodule comprises a matched attenuation network and a low-pass filter; the matching attenuation network is used for attenuating the radio frequency signal; the low-pass filter is used for performing low-pass filtering on the radio-frequency signal;
the radio frequency preamplifier is used for amplifying the radio frequency signal after attenuation and low-pass filtering and outputting the radio frequency signal to the radio frequency up-conversion circuit;
the radio frequency up-conversion circuit comprises a radio frequency up-converter and a first mixer; the radio frequency up-converter is connected with the broadband local oscillator synthesis submodule and is used for up-converting the amplified radio frequency signal and the corresponding local oscillator into a first intermediate frequency of 3.9214 GHz; the first mixer is used for down-converting the first intermediate frequency and the corresponding local oscillator into an intermediate frequency of 321.4 MHz;
the microwave preamplifier is used for amplifying the microwave signal;
the millimeter wave front-end amplifier is used for amplifying the millimeter wave signals in the frequency range of 50GHz-67 GHz;
the broadband down-conversion component comprises a band-pass filter and a third mixer; the band-pass filter is used for performing band-pass filtering and image frequency response suppression on the amplified millimeter wave signals; the third mixer adopts a high-intermediate frequency mixing scheme and is used for mixing the filtered millimeter wave signal with the 4 th harmonic of the first local oscillator signal to generate intermediate frequency output with the frequency range of 4.5 GHz-18 GHz;
the frequency mixing filtering component comprises a tracking filter and a second frequency mixer, and the second frequency mixer is connected with the broadband local oscillator synthesis submodule; the frequency mixing filter component is connected with the microwave preamplifier or the broadband down-conversion component through a switch;
when the mixing filter component is connected with the microwave preamplifier, the tracking filter is used for tracking and filtering the amplified microwave signal; the second frequency mixer is used for mixing the filtered microwave signals with the first local oscillation signal fundamental wave generated by the broadband local oscillation synthesis submodule to generate 321.4MHz second intermediate frequency signals;
when the mixing filter component is connected with the broadband down-conversion component, the tracking filter is used for tracking and filtering the intermediate frequency output in the millimeter wave band; the second frequency mixer is used for mixing the filtered signal with a first local oscillation signal fundamental wave generated by the broadband local oscillation synthesis submodule to generate a third intermediate frequency signal of 321.4 MHz;
the intermediate frequency processing module is connected with the radio frequency up-conversion circuit or the frequency mixing filtering component through a switch and is used for carrying out digital processing on an accessed intermediate frequency signal of a radio frequency, a microwave or a millimeter wave band and outputting the signal to the main control computer module.
Furthermore, the clock reference module consists of a high-stability constant-temperature crystal oscillator and a phase-locked circuit.
Further, the pulse signal generator module comprises a pulse signal generating circuit and a pulse signal conditioning circuit;
the two paths of synchronous pulse signals are realized by adopting a programmable device, can be synchronized in frequency and can be independently adjusted in amplitude.
Furthermore, the main control computer module comprises a CPU, a hard disk, an internal memory, a display unit and an input/output circuit for man-machine interaction.
Furthermore, the running environment of the system software module adopts an embedded Windows operating system, Chinese pull-down and pop-up menus and shortcut icons are adopted for operation, and the system also supports plug-and-play standard keyboards and mice; the software design supports a general purpose interface bus GPIB, a USB interface and an Ethernet interface;
the system software module comprises a program for controlling all hardware circuits, so that each hardware circuit can realize a specific measurement function, and has the functions of self-detection, self-calibration, self-adjustment, program control operation and the like.
In another aspect, the present invention provides an integrated pulse state noise coefficient testing method, including:
the pulse signal generator module outputs a first path of pulse offset signal to a switch of the tested piece according to the working standard of the tested piece;
the pulse signal generator module simultaneously generates a second path of pulse trigger signal for triggering a noise receiver and synchronously switching a noise source; the second path of pulse trigger signal is synchronous with the first path of pulse bias signal;
under the control and synchronization of the two pulse signals, the tester works in a time gating mode along with the workpiece to be tested, and the output signal of the opening stage of the workpiece to be tested is tested.
Further, the step of measuring the output signal of the opening stage of the tested piece by the tester specifically includes:
when the tested piece is opened, acquiring a to-be-tested radio frequency signal output by the tested piece under the excitation of a noise source through a radio frequency input port;
carrying out segmented filtering on the radio frequency signal to be detected;
inputting each waveband signal subjected to switch switching and segmented filtering to a mixer of a corresponding waveband, performing down-conversion with a corresponding local oscillator signal, and outputting an intermediate frequency signal subjected to down-conversion;
the output intermediate frequency signal is sent to a main control computer through a system bus after being preprocessed and digitalized;
and the main control calculation calculates the noise coefficient and the gain of the tested piece by calling system software, and displays the noise coefficient and the gain in a format required by a user.
The invention can achieve the following beneficial effects:
the pulse state noise coefficient test is completed by integrating the pulse control signal and the pulse synchronous signal generated by the built-in pulse generator, so that the problems of large volume, high cost, complex connection and low reliability caused by a test system formed by a plurality of devices and instruments at present are solved; the frequency range covers 10MHz-67GHz, and the adaptability is wider; the internal ultra-wideband noise receiver can realize one-time connection to finish the automatic measurement of the noise coefficient of the 10MHz-67GHz pulse state; by adopting segmented filtering, segmented low-noise amplification and segmented frequency mixing, image frequency response is inhibited, and single-sideband measurement of the pulse state noise coefficient is realized; testing a high-sensitivity receiver by adopting a special pulse state noise coefficient; a broadband low-noise preamplifier is preset in the receiver, so that the sensitivity of the tester is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a block diagram of an integrated pulse State noise figure tester according to an embodiment;
fig. 2 is a schematic structural diagram of a wideband noise receiver module 101 according to the first embodiment;
FIG. 3 is a flowchart of an integrated pulse state noise figure testing method according to the second embodiment;
fig. 4 is a schematic diagram of a specific work flow of step 303 in the second embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Aiming at the defects in the prior art, the invention aims to provide an integrated pulse state noise coefficient tester with a frequency coverage range of 10MHz-67GHz, which has the advantages of small volume, low cost, simple system configuration, capability of automatically completing the noise coefficient measurement of the pulse state of a tested piece by one-time connection, high test sensitivity, low test cost and high test efficiency, and greatly improves the reliability due to high system integration level.
The invention is further illustrated by the following specific examples:
example one
Fig. 1 is a structural diagram of the integrated pulse state noise coefficient tester of the embodiment, which includes:
a broadband noise receiver module 101, a clock reference module 102, a pulse signal generator module 103, a main control computer module 104, a system software module 105 and a power supply module 106;
the broadband noise receiver module 101 is configured to receive a radio frequency signal to be detected at 10MHz-67GHz, perform segmented filtering, low-noise amplification and down-conversion on the radio frequency signal, perform digital processing on the intermediate frequency signal after frequency conversion, and send the intermediate frequency signal to the main control computer module through a system bus;
the clock reference module 102 is respectively connected to the broadband noise receiver module 101 and the pulse signal generator module 103, and is configured to provide a highly stable reference time base for the generation of the phase-locked local oscillator of the broadband noise receiver module 101 and the generation of the pulse signal;
the pulse signal generator module 103 is used for simultaneously providing two paths of synchronous pulse signals, the minimum pulse width of the synchronous pulse signals is 1 mu S, and one path of synchronous pulse signals is used for providing bias input for a tested piece and is used for simulating the actual working state of the tested piece; the other path is used as a synchronous trigger signal for testing;
a main control computer module 104 connected with other modules of the tester through a bus and used for calling a system software module 105 through the bus to complete the control of the whole system so as to realize the processing of the received pulse noise signals;
the system software module 105 is connected with the main control computer module 104 and is called by the main control computer module 104;
the power module 106 is used to provide reliable and stable dc power for all hardware modules.
Further, as shown in fig. 2, a schematic structural diagram of the wideband noise receiver module 101 in this embodiment includes:
the system comprises a microwave millimeter wave switch component 201, a radio frequency signal preprocessing submodule 202, a radio frequency preamplifier 203, a radio frequency up-conversion circuit 204, a broadband local oscillator synthesis submodule 205, a microwave preamplifier 206, a millimeter wave preamplifier 207, a mixing filter component 208, a broadband down-conversion component 209 and an intermediate frequency processing module 210;
wherein,
the microwave and millimeter wave switch component 201 is used for dividing the received radio frequency signal to be detected of 10MHz-67GHz into a radio frequency signal, a microwave signal and a millimeter wave signal, respectively corresponding to three frequency bands of 10MHz-4GHz, 4GHz-50GHz and 50GHz-67GHz, and respectively accessing the radio frequency signal preprocessing submodule 202, the microwave preamplifier 206 and the millimeter wave front amplifier 207;
the radio frequency signal preprocessing submodule 202 comprises a matching attenuation network and a low-pass filter; the matching attenuation network is used for attenuating the radio frequency signal; the low-pass filter is used for performing low-pass filtering on the radio-frequency signal;
the radio frequency preamplifier 203 is used for amplifying the radio frequency signal after attenuation and low-pass filtering and outputting the radio frequency signal to the radio frequency up-conversion circuit 204;
a radio frequency up-conversion circuit 204 comprising a radio frequency up-converter and a first mixer; the radio frequency up-converter is connected to the broadband local oscillator synthesis submodule 205, and is configured to up-convert the amplified radio frequency signal and the corresponding local oscillator to a first intermediate frequency of 3.9214 GHz; the first mixer is used for down-converting the first intermediate frequency and the corresponding local oscillator into an intermediate frequency of 321.4 MHz;
a microwave preamplifier 206 for amplifying the microwave signal;
the millimeter wave front amplifier 207 is used for amplifying millimeter wave signals in a frequency range of 50GHz-67 GHz;
a mixing and filtering component 208, which includes a tracking filter and a second mixer, where the second mixer is connected to the wideband local oscillator synthesis sub-module 205; the mixing filter component 208 is connected with the microwave preamplifier 206 or the broadband down-conversion component 209 through a switch;
when the mixing filter component is connected to the microwave preamplifier 206, the tracking filter is configured to perform tracking filtering on the amplified microwave signal; the second frequency mixer is used for mixing the filtered microwave signals with the first local oscillation signal fundamental wave generated by the broadband local oscillation synthesis submodule to generate 321.4MHz second intermediate frequency signals;
when the mixing filter component is connected with the broadband down-conversion component 209, the tracking filter is used for tracking and filtering the intermediate frequency output in the millimeter wave band; the second frequency mixer is used for mixing the filtered signal with a first local oscillation signal fundamental wave generated by the broadband local oscillation synthesis submodule to generate a third intermediate frequency signal of 321.4 MHz;
a broadband down-conversion component 209 comprising a band-pass filter and a third mixer; the band-pass filter is used for performing band-pass filtering and image frequency response suppression on the amplified millimeter wave signals; the third mixer adopts a high-intermediate frequency mixing scheme and is used for mixing the filtered millimeter wave signal with the 4 th harmonic of the first local oscillation signal to generate intermediate frequency output with the frequency range of 4.5 GHz-18 GHz;
the intermediate frequency processing module 210 is connected to the radio frequency up-conversion circuit 204 or the mixing filter component 208 through a switch, and is configured to perform digital processing on the accessed intermediate frequency signal in the radio frequency, microwave, or millimeter wave band, and output the processed intermediate frequency signal to the main control computer module 104.
Further, the clock reference module 102 is composed of a high-stability constant-temperature crystal oscillator and a phase-locked circuit;
further, the pulse signal generator module 103 includes a pulse signal generating circuit and a pulse signal conditioning circuit;
the two paths of synchronous pulse signals are realized by adopting a programmable device, can be synchronized in frequency and can be independently adjusted in amplitude.
Further, the main control computer module 104 includes a CPU, a hard disk, a memory, a display unit, and an input/output circuit for human-computer interaction.
Furthermore, the running environment of the system software module 105 adopts an embedded Windows operating system, Chinese pull-down and pop-up menus and shortcut icons are adopted for operation, and the system also supports plug-and-play standard keyboards and mice; the software design supports a general purpose interface bus GPIB, a USB interface and an Ethernet interface;
the system software module 105 includes a program for controlling all hardware circuits, so that each hardware circuit can realize a specific measurement function, and has functions of self-detection, self-calibration, self-adjustment, program control operation, and the like.
Example two
Fig. 3 is a flowchart of the integrated pulse state noise coefficient testing method of the present embodiment, which includes:
step 301, the pulse signal generator module outputs a first path of pulse bias signal to a switch of a tested piece according to the working standard of the tested piece;
step 302, the pulse signal generator module simultaneously generates a second path of pulse trigger signal for triggering of the noise receiver and synchronous switching of the noise source; the second path of pulse trigger signal is synchronous with the first path of pulse bias signal;
and step 303, under the control and synchronization of the two pulse signals, the tester works in a time gating mode along with the workpiece to be tested, and the output signal of the opening stage of the workpiece to be tested is tested.
Fig. 4 is a schematic diagram of a specific work flow of step 303, as shown in the figure, further, step 303 specifically includes:
3031, when a tested piece is opened, acquiring a to-be-tested radio frequency signal output by the tested piece under the excitation of a noise source through a radio frequency input port;
step 3032, the radio frequency signal to be measured is filtered in sections;
3033, inputting each band signal after switching and segmented filtering to a mixer of a corresponding band, performing down-conversion with a corresponding local oscillator signal, and outputting an intermediate frequency signal after down-conversion;
3034, the output intermediate frequency signal is sent to the main control computer through the system bus after being preprocessed and digitalized;
further, the method also comprises the following steps:
step 3035, the main control calculation calculates the noise coefficient and the gain of the tested piece by calling the system software, and displays the noise coefficient and the gain in the format required by the user.
Through the embodiment, the invention can achieve the following beneficial effects:
the pulse state noise coefficient test is completed by integrating the pulse control signal and the pulse synchronous signal generated by the built-in pulse generator, so that the problems of large volume, high cost, complex connection and low reliability caused by a test system formed by a plurality of devices and instruments at present are solved; the frequency range covers 10MHz-67GHz, and the adaptability is wider; the internal ultra-wideband noise receiver can realize one-time connection to finish the automatic measurement of the noise coefficient of the 10MHz-67GHz pulse state; by adopting segmented filtering, segmented low-noise amplification and segmented frequency mixing, image frequency response is inhibited, and single-sideband measurement of the pulse state noise coefficient is realized; testing a high-sensitivity receiver by adopting a special pulse state noise coefficient; a broadband low-noise preamplifier is preset in the receiver, so that the sensitivity of the tester is improved.
Those of skill in the art will further appreciate that the various illustrative logical blocks, units, and steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate the interchangeability of hardware and software, various illustrative components, elements, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design requirements of the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present embodiments.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. An integrated pulse state noise figure tester, comprising: the system comprises a broadband noise receiver module, a clock reference module, a pulse signal generator module, a main control computer module, a system software module and a power supply module;
the broadband noise receiver module is used for receiving a radio frequency signal to be detected of 10MHz-67GHz, performing segmented filtering, low-noise amplification and down-conversion on the radio frequency signal, and sending a frequency-converted intermediate frequency signal to the main control computer module through a system bus after the frequency-converted intermediate frequency signal is subjected to digital processing;
the clock reference module is respectively connected with the broadband noise receiver module and the pulse signal generator module and is used for providing a high-stability reference time base for the generation of a phase-locked local oscillator of the broadband noise receiver module and the generation of a pulse signal;
the pulse signal generator module is used for simultaneously providing two paths of synchronous pulse signals, the minimum pulse width of the synchronous pulse signals is 1 mu S, and one path of synchronous pulse signals is used for providing bias input for a tested piece and is used for simulating the actual working state of the tested piece; the other path is used as a synchronous trigger signal for testing;
the main control computer module is connected with other modules of the tester through a bus and used for calling the system software module through the bus to complete the control of the whole system so as to realize the processing of the received pulse noise signal;
the system software module is connected with the main control computer module and is called by the main control computer module;
the power supply module is used for providing a reliable and stable direct-current power supply for all the hardware modules;
the wideband noise receiver module comprises: the device comprises a microwave millimeter wave switch component, a radio frequency signal preprocessing submodule, a radio frequency preamplifier, a radio frequency up-conversion circuit, a broadband local oscillator synthesis submodule, a microwave preamplifier, a millimeter wave preamplifier, a mixing filter component, a broadband down-conversion component and an intermediate frequency processing module; wherein,
the microwave and millimeter wave switch component is used for dividing the received radio frequency signal to be detected of 10MHz-67GHz into a radio frequency signal, a microwave signal and a millimeter wave signal, respectively corresponding to three frequency bands of 10MHz-4GHz, 4GHz-50GHz and 50GHz-67GHz, and respectively accessing the radio frequency signal preprocessing submodule, the microwave preamplifier and the millimeter wave preamplifier;
the radio frequency signal preprocessing submodule comprises a matched attenuation network and a low-pass filter; the matching attenuation network is used for attenuating the radio frequency signal; the low-pass filter is used for performing low-pass filtering on the radio-frequency signal;
the radio frequency preamplifier is used for amplifying the radio frequency signal after attenuation and low-pass filtering and outputting the radio frequency signal to the radio frequency up-conversion circuit;
the radio frequency up-conversion circuit comprises a radio frequency up-converter and a first mixer; the radio frequency up-converter is connected with the broadband local oscillator synthesis submodule and is used for up-converting the amplified radio frequency signal and the corresponding local oscillator into a first intermediate frequency of 3.9214 GHz; the first mixer is used for down-converting the first intermediate frequency and the corresponding local oscillator into an intermediate frequency of 321.4 MHz;
the microwave preamplifier is used for amplifying the microwave signal;
the millimeter wave front-end amplifier is used for amplifying the millimeter wave signals in the frequency range of 50GHz-67 GHz;
the broadband down-conversion component comprises a band-pass filter and a third mixer; the band-pass filter is used for performing band-pass filtering and image frequency response suppression on the amplified millimeter wave signals; the third mixer adopts a high-intermediate frequency mixing scheme and is used for mixing the filtered millimeter wave signal with the 4 th harmonic of the first local oscillator signal to generate intermediate frequency output with the frequency range of 4.5 GHz-18 GHz;
the frequency mixing filtering component comprises a tracking filter and a second frequency mixer, and the second frequency mixer is connected with the broadband local oscillator synthesis submodule; the frequency mixing filter component is connected with the microwave preamplifier or the broadband down-conversion component through a switch;
when the mixing filter component is connected with the microwave preamplifier, the tracking filter is used for tracking and filtering the amplified microwave signal; the second frequency mixer is used for mixing the filtered microwave signals with the first local oscillation signal fundamental wave generated by the broadband local oscillation synthesis submodule to generate 321.4MHz second intermediate frequency signals;
when the mixing filter component is connected with the broadband down-conversion component, the tracking filter is used for tracking and filtering the intermediate frequency output in the millimeter wave band; the second frequency mixer is used for mixing the filtered signal with a first local oscillation signal fundamental wave generated by the broadband local oscillation synthesis submodule to generate a third intermediate frequency signal of 321.4 MHz;
the intermediate frequency processing module is connected with the radio frequency up-conversion circuit or the frequency mixing filtering component through a switch and is used for carrying out digital processing on an accessed intermediate frequency signal of a radio frequency, a microwave or a millimeter wave band and outputting the signal to the main control computer module.
2. The tester of claim 1, wherein the clock reference module is comprised of a highly stable oven crystal and a phase-locked circuit.
3. The test meter of claim 1, wherein the pulse signal generator module includes a pulse signal generating circuit and a pulse signal conditioning circuit;
the two paths of synchronous pulse signals are realized by adopting a programmable device, can be synchronized in frequency and can be independently adjusted in amplitude.
4. The tester as claimed in claim 1, wherein the main control computer module comprises a CPU, a hard disk, a memory, a display unit and an input/output circuit for man-machine interaction.
5. The tester of claim 1, wherein the operating environment of the system software module is an embedded Windows operating system, the operation is in a manner of chinese pull-down and pop-up menus and shortcut icons, and the system also supports plug-and-play standard keyboards and mice; the software design supports a general purpose interface bus GPIB, a USB interface and an Ethernet interface;
the system software module comprises a program for controlling all hardware circuits, so that each hardware circuit can realize a specific measurement function, and has the functions of self-detection, self-calibration, self-adjustment, program control operation and the like.
6. An integrated pulse state noise coefficient testing method is characterized by comprising the following steps:
the pulse signal generator module outputs a first path of pulse offset signal to a switch of the tested piece according to the working standard of the tested piece;
the pulse signal generator module simultaneously generates a second path of pulse trigger signal for triggering a noise receiver and synchronously switching a noise source; the second path of pulse trigger signal is synchronous with the first path of pulse bias signal;
under the control and synchronization of the two pulse signals, the tester works in a time gating mode along with the workpiece to be tested, and the output signal of the opening stage of the workpiece to be tested is tested.
7. The method of claim 6, wherein the measuring of the output signal of the open stage of the device under test by the tester specifically comprises:
when the tested piece is opened, acquiring a to-be-tested radio frequency signal output by the tested piece under the excitation of a noise source through a radio frequency input port;
carrying out segmented filtering on the radio frequency signal to be detected;
inputting each waveband signal subjected to switch switching and segmented filtering to a mixer of a corresponding waveband, performing down-conversion with a corresponding local oscillator signal, and outputting an intermediate frequency signal subjected to down-conversion;
the output intermediate frequency signal is sent to a main control computer through a system bus after being preprocessed and digitalized;
and the main control calculation calculates the noise coefficient and the gain of the tested piece by calling system software, and displays the noise coefficient and the gain in a format required by a user.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510233681.0A CN104993887B (en) | 2015-05-08 | 2015-05-08 | Integrated pulse condition noise coefficient method of testing and tester |
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| CN107045119B (en) * | 2017-04-26 | 2020-02-21 | 北京无线电测量研究所 | Automatic test system for airborne receiver |
| 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 |
| CN107576846B (en) * | 2017-08-25 | 2019-09-10 | 中国电子科技集团公司第四十一研究所 | A kind of High Precise Frequency Measurement System and method based on sampling frequency-changing technology |
| 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 |
| 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 |
| CN110333398B (en) * | 2019-07-10 | 2020-05-05 | 北京航空航天大学 | 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 |
| CN112530825B (en) * | 2020-11-26 | 2021-09-14 | 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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| CN103353593A (en) * | 2013-07-04 | 2013-10-16 | 合肥开泰工贸有限责任公司 | Multifunctional universal tester used for LTC radar |
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