CN104993887B - Integrated pulse condition noise coefficient method of testing and tester - Google Patents

Abstract

The present invention relates to the technical field of testing, in particular to an integrated pulse state noise coefficient testing method and tester, the method comprising: the pulse signal generator module presets and outputs the first pulse bias signal to the The DUT is used for the switch of the DUT; the pulse signal generator module generates a second pulse trigger signal at the same time, which is used for the trigger of the noise receiver and the synchronous switch of the noise source; the second pulse trigger signal and the described The first pulse bias signal is synchronized; under the control and synchronization of the two pulse signals, the tester works in the time gating mode with the DUT to measure the output signal of the DUT opening stage; the method adopts an integrated The modern structure design solves the problems of large size, high cost, complicated connection and low reliability caused by the current test system composed of multiple devices and instruments.

Description

Integrated pulse state noise figure test method and tester

technical field

The invention relates to the technical field of testing, in particular to an integrated pulse state noise coefficient testing method and a testing instrument.

Background technique

At present, most low-noise receiver systems, subsystems, and components in the fields of radar and communication work in the pulse state. As an important technical index of the low-noise receiver system, the noise figure must be tested in the pulse state. A high-sensitivity receiver can reduce the transmission power of the transmitter, which means that a power amplifier with a smaller specification and a smaller output power, a smaller antenna and a lower cost can be used, so the pulse of the receiver system can be accurately measured The noise figure in the working state plays an extremely important role in the optimal design of the electronic communication system under the pulse system.

The current frequency range of domestic integrated noise figure testing instruments covers 10MHz-40GHz, and it is only suitable for measuring the noise figure of the DUT in the uninterrupted working state, and cannot measure the noise figure of the DUT in the pulsed state.

From a foreign point of view, Agilent Corporation of the United States provides supporting instruments, and AURIGA Corporation conducts system integration and pulse state noise figure measurement method research, and develops the AU13000 series integrated noise figure analyzer (SNFA). The coefficient test system realizes the measurement of the noise figure of microwave and millimeter wave low-noise devices in the pulse working state. The system includes a VXI network parameter test module, a signal generator, a signal processor and a solid-state noise source, etc. The current technical level is: within the frequency coverage range of 50MHz ~ 50GHz, it can provide pulse noise figure measurement with a minimum pulse width of 1μS.

In addition to the American AURIGA company, the German RS company also provides pulsed state noise figure test solutions. RS company adds the noise figure test option on the basis of the spectrum analyzer, and realizes the noise figure measurement in the pulse mode through an external function or pulse signal generator. The function or pulse generator provides a pulse bias signal, and the pulse duty cycle is determined by the test standard of the device under test. The function or pulse generator also provides a trigger pulse signal synchronized with the amplifier bias to the spectrum analyzer.

The existing pulse state noise figure test system mainly has the following disadvantages:

(1) Multiple instruments are required, the system connection is complicated, the reliability is low, the cost is high, and the test efficiency is low.

(2) The frequency range is up to 50GHz, and the measurement of higher frequency DUTs cannot be performed.

(3) The sensitivity of the system is not high, and the test accuracy is poor.

Contents of the invention

In view of the defects existing in the prior art, the purpose of the present invention is to provide an integrated pulse state noise figure tester to solve the problems of large size, high cost, complicated connection and reliability caused by the current test system composed of multiple devices and instruments. low problem.

In order to achieve the above purpose, on the one hand, the present invention provides an integrated pulse state noise figure tester, comprising:

Broadband noise receiver module, clock reference module, pulse signal generator module, main control computer module, system software module and power supply module;

Wherein, the broadband noise receiver module is used to receive the 10MHz-67GHz radio frequency signal to be tested, and perform segment filtering, low noise amplification and frequency down conversion on it, and digitally process the converted intermediate frequency signal through the system bus Send to the main control computer module;

The clock reference module is respectively connected to the broadband noise receiver module and the pulse signal generator module, and is used to provide a highly stable reference time base for the phase-locked local oscillator generation and pulse signal generation of the broadband noise receiver module;

The pulse signal generator module is used to provide two channels of synchronous pulse signals at the same time, the minimum pulse width of which is 1μS, and one channel is used for bias input to the device under test, which is used to simulate the actual working state of the device under test; the other channel is used as Synchronous trigger signal for testing;

The main control computer module is connected to other modules of the tester through the bus, and is used to call the system software module through the bus to complete the control of the entire system, so as to realize the processing of the received impulse noise signal;

The system software module is connected to the main control computer module for calling by the main control computer module;

The power module is used to provide reliable and stable DC power for all hardware modules.

Further, the wideband noise receiver module includes:

Microwave and millimeter wave switch components, RF signal preprocessing sub-module, RF preamplifier, RF up-conversion circuit, broadband local oscillator synthesis sub-module, microwave pre-amplifier, millimeter-wave pre-amplifier, mixing filter component, broadband down-conversion component and an intermediate frequency processing module; wherein,

The microwave and millimeter wave switch assembly is used to divide the received radio frequency signal of 10MHz-67GHz to be tested into radio frequency signal, microwave signal and millimeter wave signal, corresponding to 10MHz-4GHz, 4GHz-50GHz and 50GHz-67GHz respectively frequency bands, which are respectively connected to the radio frequency signal preprocessing submodule, microwave preamplifier and millimeter wave preamplifier;

The radio frequency signal preprocessing sub-module includes a matched attenuation network and a low-pass filter; the matched attenuation network is used to attenuate the radio frequency signal; the low pass filter is used to low-pass the radio frequency signal pass filter;

The RF preamplifier is used to amplify the attenuated and low-pass filtered RF signal, and output it to the RF up-conversion circuit;

The radio frequency up-conversion circuit includes a radio frequency up-converter and a first mixer; the radio frequency up-converter is connected to the broadband local oscillator synthesis sub-module, and is used for up-converting the amplified radio frequency signal and the corresponding local oscillator The first intermediate frequency is 3.9214GHz; the first mixer is used to down-convert the first intermediate frequency and the corresponding local oscillator to an intermediate frequency of 321.4MHz;

The microwave preamplifier is used to amplify the microwave signal;

The millimeter wave preamplifier is used to amplify the millimeter wave signal in the 50GHz-67GHz frequency band;

The broadband down-conversion component includes a band-pass filter and a third mixer; the band-pass filter is used for band-pass filtering and suppressing the image frequency response to the amplified millimeter wave signal; the third mixer uses a The frequency mixing scheme is used to mix the filtered millimeter wave signal with the 4th harmonic of the first local oscillator signal to generate an intermediate frequency output with a frequency range of 4.5GHz to 18GHz;

The frequency mixing and filtering component includes a tracking filter and a second mixer, and the second mixer is connected to the broadband local oscillator synthesis sub-module; the mixing and filtering component is connected to the microwave preamplifier or the broadband downlink through a switch. The frequency conversion components are connected;

When the frequency mixing and filtering component is connected to the microwave preamplifier, the tracking filter is used to track and filter the amplified microwave signal; the second mixer is used to combine the filtered microwave signal with the broadband local The fundamental wave of the first local oscillator signal generated by the vibration synthesis sub-module is mixed to generate a second intermediate frequency signal of 321.4MHz;

When the frequency mixing and filtering component is connected to the broadband down-conversion component, the tracking filter is used to track and filter the intermediate frequency output of the millimeter wave band; the second mixer is used to combine the filtered signal with the broadband The fundamental wave of the first local oscillator signal generated by the local oscillator synthesis sub-module is mixed to generate the third intermediate frequency signal of 321.4MHz;

The intermediate frequency processing module is connected to the radio frequency up-conversion circuit or the frequency mixing and filtering component through a switch, and is used to digitally process the intermediate frequency signal of the radio frequency, microwave or millimeter wave band and output it to the main control computer module .

Further, the clock reference module is composed of a highly stable constant temperature crystal oscillator and a phase-locked circuit.

Further, the pulse signal generator module includes a pulse signal generation circuit and a pulse signal conditioning circuit;

The two synchronous pulse signals are implemented by a programmable device, which can be synchronized in frequency and independently adjustable in amplitude.

Further, the main control computer module includes a CPU, a hard disk, a memory, a display unit and input and output circuits for human-computer interaction.

Further, the operating environment of the system software module adopts the embedded Windows operating system, and the operation adopts the mode of Chinese drop-down menu and pop-up menu and shortcut icons, and the system also supports plug-and-play standard keyboard and mouse; software design supports general interface Bus GPIB, USB interface, Ethernet interface;

The software module of the system includes a program to control all hardware circuits, so that each hardware circuit can realize a specific measurement function, and has functions such as self-test, self-calibration, self-adjustment and program-controlled operation.

On the other hand, the present invention provides an integrated pulse state noise figure testing method, comprising:

The pulse signal generator module presets and outputs the first pulse bias signal to the DUT for the switch of the DUT according to the working standard of the DUT;

The pulse signal generator module simultaneously generates a second pulse trigger signal for triggering of the noise receiver and synchronous switching of the noise source; the second pulse trigger signal is synchronized with the first pulse bias signal;

Under the control and synchronization of the two pulse signals, the tester works in the time gating mode along with the DUT, and measures the output signal of the DUT in the opening stage.

Further, the output signal measured by the testing instrument at the opening stage of the DUT specifically includes:

When the device under test is turned on, the radio frequency signal to be tested output by the device under test under the excitation of the noise source is obtained through the radio frequency input port;

performing segment filtering on the radio frequency signal to be tested;

The signals of each band after being switched and filtered by the switch are input to the mixer of the corresponding band, and the frequency is down-converted with the corresponding local oscillator signal, and the intermediate frequency signal after the down-conversion is output;

After pre-processing and digitizing the output intermediate frequency signal, it is sent to the main control computer through the system bus;

The main control calculation calculates the noise figure and gain of the DUT by calling the system software, and displays it in the format required by the user.

The present invention can achieve following beneficial effect:

The built-in pulse generator generates the pulse control signal and the pulse synchronization signal to complete the pulse state noise figure test, which solves the problem of bulky, expensive, complicated connection and low reliability caused by the current test system composed of multiple devices and instruments. The frequency range covers 10MHz-67GHz, and the adaptability is wider and wider; the internal ultra-wideband noise receiver can realize the automatic measurement of 10MHz-67GHz pulse state noise figure with one connection; Noise amplification and segmental mixing suppress the image frequency response and realize the single-sideband measurement of the noise figure in the pulse state; use the special pulse state noise figure to test the high-sensitivity receiver; the receiver is preset with a wideband low-noise preamplifier , improve the sensitivity of the tester.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the structural diagram of embodiment one integrated pulse state noise figure tester;

FIG. 2 is a schematic structural diagram of a broadband noise receiver module 101 in Embodiment 1;

Fig. 3 is the flow chart of embodiment two integrated pulse state noise figure test method;

FIG. 4 is a schematic diagram of the specific workflow of step 303 in the second embodiment.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Aiming at the defects existing in the prior art, the purpose of the present invention is to provide an integrated frequency coverage range of 10MHz-67GHz pulse state noise figure tester, which is small in size, low in cost, simple in system configuration, and can automatically complete the DUT once connected. The noise figure measurement in the pulse state has high test sensitivity, low test cost, high test efficiency, and the reliability is greatly improved due to the high degree of system integration.

The present invention is further illustrated below by specific examples:

Embodiment one

Fig. 1 is the structural diagram of the integrated pulse state noise figure tester of the present embodiment, including:

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 supply module 106;

Among them, the broadband noise receiver module 101 is used to receive the 10MHz-67GHz radio frequency signal to be tested, and perform segment filtering, low noise amplification and frequency down conversion on it, and digitally process the frequency converted intermediate frequency signal before sending it through the system bus to the main control computer module;

The clock reference module 102 is connected to the wideband noise receiver module 101 and the pulse signal generator module 103 respectively, and is used to provide a highly stable reference time base for the phase-locked local oscillator generation of the wideband noise receiver module 101 and the generation of the pulse signal;

The pulse signal generator module 103 is used to provide two channels of synchronous pulse signals at the same time, the minimum pulse width of which is 1μS, one channel is used for bias input to the device under test, and is used to simulate the actual working state of the device under test; the other channel is used as Synchronous trigger signal for testing;

The main control computer module 104 is connected to other modules of the tester through the bus, and is used to call the system software module 105 through the bus to complete the control of the entire system, so as to realize the processing of the received impulse noise signal;

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 106 power supply modules are used to provide reliable and stable DC power for all hardware modules.

Further, as shown in FIG. 2, it is a schematic structural diagram of the broadband noise receiver module 101 of this embodiment, including:

Microwave and millimeter wave switch components 201, radio frequency signal preprocessing submodule 202, radio frequency preamplifier 203, radio frequency up-conversion circuit 204, broadband local oscillator synthesis submodule 205, microwave preamplifier 206, millimeter wave preamplifier 207, frequency mixing Filter component 208, broadband down-conversion component 209, intermediate frequency processing module 210;

in,

The microwave and millimeter wave switch assembly 201 is used to divide the received 10MHz-67GHz radio frequency signal to be tested 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, Respectively access the radio frequency signal preprocessing sub-module 202, the microwave preamplifier 206 and the millimeter wave preamplifier 207;

The radio frequency signal preprocessing sub-module 202 includes a matched attenuation network and a low-pass filter; the matched attenuation network is used to attenuate the radio frequency signal; the low-pass filter filter is used to low-pass filter the radio frequency signal;

The radio frequency preamplifier 203 is used to amplify the radio frequency signal after attenuation and low-pass filtering, and output it to the radio frequency up-conversion circuit 204;

The radio frequency up-conversion circuit 204 includes a radio frequency up-converter and a first mixer; the radio frequency up-converter is connected with the broadband local oscillator synthesis sub-module 205, and is used for up-converting the amplified radio frequency signal and the corresponding local oscillator The first intermediate frequency is 3.9214GHz; the first mixer is used to down-convert the first intermediate frequency and the corresponding local oscillator to an intermediate frequency of 321.4MHz;

Microwave preamplifier 206, for amplifying the microwave signal;

The millimeter wave preamplifier 207 is used to amplify the millimeter wave signal in the 50GHz-67GHz frequency band;

The frequency mixing and filtering component 208 includes a tracking filter and a second mixer, and the second mixer is connected with the broadband local oscillator synthesis submodule 205; the frequency mixing and filtering component 208 is connected with the microwave preamplifier 206 or the broadband down-conversion through a switch Components 209 are connected;

When the frequency mixing filter component is connected with the microwave preamplifier 206, the tracking filter is used to track and filter the amplified microwave signal; the second mixer is used to combine the filtered microwave signal with the first broadband local oscillator synthesis sub-module The fundamental wave of the local oscillator signal is mixed to generate the second intermediate frequency signal of 321.4MHz;

When the frequency mixing filter component is connected with the broadband down-conversion component 209, the tracking filter is used to track and filter the intermediate frequency output of the millimeter wave band; the second mixer is used to combine the filtered signal with the first broadband local oscillator synthesis sub-module. The fundamental wave of the local oscillator signal is mixed to generate the third intermediate frequency signal of 321.4MHz;

The broadband down-conversion component 209 includes a band-pass filter and a third mixer; the band-pass filter is used to band-pass filter the amplified millimeter-wave signal and suppress the image frequency response; the third mixer uses an intermediate frequency The frequency mixing scheme is used to mix the filtered millimeter wave signal with the 4th harmonic of the first local oscillator signal to generate an intermediate frequency output with a frequency range of 4.5GHz to 18GHz;

The intermediate frequency processing module 210 is connected to the radio frequency up-conversion circuit 204 or the frequency mixing and filtering component 208 through a switch, and is used for digitally processing the incoming radio frequency, microwave or millimeter wave intermediate frequency signal and outputting it to the main control computer module 104 .

Further, the clock reference module 102 is composed of a highly stable constant temperature crystal oscillator and a phase-locked circuit;

Further, the pulse signal generator module 103 includes a pulse signal generation circuit and a pulse signal conditioning circuit;

The two synchronous pulse signals are implemented by programmable devices, which can be synchronized in frequency and independently adjustable in amplitude.

Further, the main control computer module 104 includes a CPU, a hard disk, a memory, a display unit, and input and output circuits for human-computer interaction.

Further, the operating environment of the system software module 105 adopts an embedded Windows operating system, and the operation adopts Chinese drop-down menus, pop-up menus and shortcut icons, and the system also supports plug-and-play standard keyboards and mice; the software design supports the universal interface bus GPIB, USB interface, Ethernet interface;

The system software module 105 includes programs for controlling all hardware circuits, so that each hardware circuit can realize a specific measurement function, and has functions such as self-test, self-calibration, self-adjustment and program-controlled operation.

Embodiment two

Fig. 3 is the flow chart of the method for testing the integrated pulse state noise figure of the present embodiment, including:

Step 301, the pulse signal generator module presets and outputs the first pulse bias signal to the device under test according to the working standard of the device under test, and is used for the switch of the device under test;

Step 302, the pulse signal generator module simultaneously generates a second pulse trigger signal for triggering the noise receiver and synchronous switching of the noise source; the second pulse trigger signal is synchronized with the first pulse bias signal;

Step 303 , under the control and synchronization of the two pulse signals, the tester works in the time-gated mode along with the DUT, and measures the output signal of the DUT in the opening stage.

FIG. 4 is a schematic diagram of a specific workflow of step 303. As shown in the figure, further, step 303 specifically includes:

Step 3031, when the device under test is turned on, obtain the radio frequency signal to be tested output by the device under test under the excitation of the noise source through the radio frequency input port;

Step 3032, performing segmentation filtering on the RF signal to be tested;

Step 3033, input the signals of each band after switch switching and segmental filtering to the mixer of the corresponding band, perform down-conversion with the corresponding local oscillator signal, and output the down-converted intermediate frequency signal;

Step 3034, after preprocessing and digitizing the output intermediate frequency signal, send it to the main control computer through the system bus;

Further, it also includes:

Step 3035, the main control calculates the noise figure and gain of the DUT by calling the system software, and displays it in the format required by the user.

Through the above embodiments, the present invention can achieve the following beneficial effects:

The built-in pulse generator generates the pulse control signal and the pulse synchronization signal to complete the pulse state noise figure test, which solves the problem of bulky, expensive, complicated connection and low reliability caused by the current test system composed of multiple devices and instruments. The frequency range covers 10MHz-67GHz, and the adaptability is wider and wider; the internal ultra-wideband noise receiver can realize the automatic measurement of 10MHz-67GHz pulse state noise figure with one connection; Noise amplification and segmental mixing suppress the image frequency response and realize the single-sideband measurement of the noise figure in the pulse state; use the special pulse state noise figure to test the high-sensitivity receiver; the receiver is preset with a wideband low-noise preamplifier , improve the sensitivity of the tester.

Those skilled in the art can also understand that various illustrative logical blocks, units, and steps listed in the embodiments of the present invention can be implemented by electronic hardware, computer software, or a combination of both. To clearly demonstrate the interchangeability of hardware and software, the various illustrative components, units and steps above have generally described their functions. Whether such functions are implemented by hardware or software depends on the specific application and overall system design requirements. Those skilled in the art may use various methods to implement the described functions for each specific application, but such implementation should not be understood as exceeding the protection scope of the embodiments of the present invention.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the scope of the present invention. Protection scope, within the spirit and principles of the present invention, any modification, equivalent replacement, improvement, etc., shall be included in the protection 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.