CN115189713A - Mixer testing device and method - Google Patents

Abstract

The present application is applicable to the technical field of automated testing, and provides a mixer testing device and method. The mixer testing device includes: a vector network analyzer, an intermediate frequency transceiver switching module, a radio frequency transceiver switching module, a local oscillator source module and a controller, and the vector network analyzer is respectively connected with the intermediate frequency transceiver switching module and the radio frequency transceiver switching module for use in Generate intermediate frequency signal or radio frequency signal, and perform parameter test on the received radio frequency signal or intermediate frequency signal. Attenuate the intermediate frequency signal, amplify or attenuate the radio frequency signal, and generate the local oscillator signal, and the controller is respectively connected with the intermediate frequency transceiver switching module, the radio frequency transceiver switching module and the local oscillator source module to control the above modules. The mixer testing device provided by the present application can improve the testing stability of the mixer, shorten the testing time, and improve the testing efficiency.

Description

Mixer testing device and method

technical field

The present application relates to the technical field of automated testing, and in particular to a mixer testing device and method.

Background technique

In the field of radio communication, the quality of communication products depends on the design and implementation method of radio frequency communication hardware. As a key component of radio frequency communication hardware, the linearity of the mixer determines the dynamic range of the link before and after the frequency conversion, the frequency conversion loss determines the gain of the link before and after the frequency conversion, and the spur determines the index requirements of the filter of the transmitting and receiving links , it can be seen that the linearity, frequency conversion loss and stray of the mixer play a decisive role in the performance index of the whole machine, so it is very important to test the parameters of the mixer.

The existing test of the mixer parameters is completed by using two signal sources and one spectrum, and the mixer parameters are limited and the test is unstable, which in turn leads to the problem of low test efficiency.

SUMMARY OF THE INVENTION

In view of this, the embodiments of the present application provide a mixer testing device and method, so as to solve the situation that the mixer parameters are limited and the testing is unstable in the existing mixer testing device and method, which in turn leads to testing efficiency Low technical issues.

In a first aspect, an embodiment of the present application provides a mixer testing device, including: a vector network analyzer, an intermediate frequency transceiver switching module, a radio frequency transceiver switching module, a local oscillator source module, and a controller.

The first port of the vector network analyzer is connected to the first signal port of the intermediate frequency transceiver switching module, and the second port is connected to the fourth signal port of the radio frequency transceiver switching module. The vector network analyzer is used to generate intermediate frequency signals, and analyze the received Perform parametric test on RF signal, or generate RF signal, and perform parametric test on received IF signal; the second signal port of the IF transceiver switching module is connected to the IF port of the mixer to be tested, and the IF transceiver switching module is used to amplify or attenuate the IF signal; the third signal port of the RF transceiver switch module is connected to the RF port of the mixer to be tested, and the RF transceiver switch module is used to amplify or attenuate the RF signal; the output port of the local oscillator module is connected to the mixer to be tested The local oscillator source module is used to generate the local oscillator signal; the controller is respectively connected with the intermediate frequency transceiver switching module, the radio frequency transceiver switching module and the local oscillator source module to control the intermediate frequency transceiver switching module to amplify or attenuate the intermediate frequency signal, And, the radio frequency transceiver switching module is controlled to amplify or attenuate the radio frequency signal, and the local oscillator source module is controlled to generate the local oscillator signal.

In a possible implementation manner of the first aspect, the intermediate frequency transceiver switching module further includes: a first intermediate frequency switch, a second intermediate frequency switch, a first power amplifier and a first power attenuator; one end of the first intermediate frequency switch is connected to the first intermediate frequency switch. The signal port is connected, the other end is connected with the input end of the first power amplifier, the output end of the first power amplifier is connected with the second intermediate frequency switch, and the other end of the second intermediate frequency switch is connected with the second signal port; The output end is connected to the first intermediate frequency switch, and the input end is connected to the second intermediate frequency switch.

In a possible implementation of the first aspect, the first intermediate frequency switch, the second intermediate frequency switch and the first power amplifier constitute an intermediate frequency amplification channel, and the intermediate frequency amplification channel is used to amplify the intermediate frequency signal; the first intermediate frequency switch, the second intermediate frequency switch and the first power attenuator to form an intermediate frequency attenuation channel, and the intermediate frequency attenuation channel is used for attenuating intermediate frequency signals.

In a possible implementation of the first aspect, the radio frequency transceiver switching module further includes: a third radio frequency switch, a fourth radio frequency switch, a second power amplifier, a third power amplifier, a second power attenuator, and a third power attenuator One end of the fourth radio frequency switch is connected to the fourth signal port, the other end is connected to the input end of the third power amplifier, the output end of the third power amplifier is connected to the input end of the third power attenuator, and the third power attenuator The output end of the second power amplifier is connected to the input end of the second power amplifier, the output end of the second power amplifier is connected to the third radio frequency switch, the other end of the third radio frequency switch is connected to the third signal port; the output end of the second power attenuator is connected to The fourth radio frequency switch is connected, and the input end is connected to the third radio frequency switch.

In a possible implementation manner of the first aspect, the third radio frequency switch, the fourth radio frequency switch, the second power amplifier, the third power amplifier and the third power attenuator constitute a radio frequency amplification channel, and the radio frequency amplification channel is used for amplifying the radio frequency signal; the third radio frequency switch, the fourth radio frequency switch and the second power attenuator form a radio frequency attenuation channel, and the radio frequency attenuation channel is used for attenuating radio frequency signals.

In a possible implementation of the first aspect, the local oscillator source module further includes: a local oscillator source, a fourth power amplifier, a power level converter and a power detection control chip; one end of the local oscillator source is connected to the fourth power amplifier The input end of the fourth power amplifier is connected to the output port; one end of the power level converter is connected to the local oscillator source, the other end is connected to the power detection control chip, and the other end of the power detection control chip is connected to the fourth power The output end of the amplifier is connected; the local oscillator source is connected with the power detection control chip.

In a possible implementation of the first aspect, the local oscillator source is used to generate the original vibration signal; the fourth power amplifier is used to amplify the original vibration signal to obtain the local vibration signal; the power detection control chip is used to detect the original vibration signal The power of the signal, the sum, controls the frequency of the original vibration signal, and the sum, controls the amplification factor of the fourth power amplifier.

In a possible implementation of the first aspect, the intermediate frequency transceiver switch module further includes a first control port and a first power port, the radio frequency transceiver switch module further includes a second control port and a second power port, and the local oscillator source module further It includes a third control port and a third power port; the controller is respectively connected with the first control port, the second control port and the third control port; the controller is used to control the amplification or attenuation of the intermediate frequency signal by controlling the level state of the first control port , and, control the amplification or attenuation of the radio frequency signal by controlling the level state of the second control port, and, send control information to the third control port; wherein, the control information is used to control the frequency and the frequency of the local oscillator signal by controlling the power detection control chip Power; the first power port is used to supply power to the active circuit in the intermediate frequency transceiver switching module, the second power port is used to supply power to the active circuit in the radio frequency transceiver switching module, and the third power port is used to supply power to the local oscillator source module. powered by the active circuit.

In a second aspect, an embodiment of the present application provides a method for testing a mixer. The method is applied to the mixer testing device according to any one of the first aspects. The method includes: performing an up-conversion test on a mixer. When , the vector network analyzer generates the first IF signal from the first port; the IF transceiver switching module amplifies the first IF signal, and sends the amplified first IF signal to the mixer under test; the local oscillator source module generates the first local oscillator signal, and send the first local oscillator signal to the mixer under test; the radio frequency transceiver switching module attenuates the first radio frequency signal received from the mixer under test, and the attenuated first radio frequency signal The radio frequency signal is sent to the vector network analyzer, wherein the first radio frequency signal is obtained after the amplified first intermediate frequency signal and the first local oscillator signal are mixed and processed by the mixer to be measured; the second port of the vector network analyzer receives A parameter test is performed on the attenuated first radio frequency signal and the attenuated first radio frequency signal to obtain a first parameter of the mixer.

During the down-conversion test of the mixer, the vector network analyzer generates a second RF signal from the second port; the RF transceiver switching module amplifies the second RF signal, and sends the amplified second RF signal to the mixer to be tested The local oscillator source module generates a second local oscillator signal and sends the second local oscillator signal to the mixer under test; the intermediate frequency transceiver switching module attenuates the second intermediate frequency signal received from the mixer under test , and send the attenuated second intermediate frequency signal to the vector network analyzer, wherein the second intermediate frequency signal is obtained by the amplified second radio frequency signal and the second local oscillator signal after being mixed by the mixer to be tested; the vector The first port of the network analyzer receives the attenuated second intermediate frequency signal and performs parameter testing on the attenuated second intermediate frequency signal to obtain the second parameter of the mixer.

In a possible implementation manner of the second aspect, the mixer testing method further includes: when the mixer up-conversion test is performed, the controller controls the intermediate frequency transceiver switching module to be in a state of amplifying the intermediate frequency signal, and controls the radio frequency transceiver The switching module is in the state of attenuating the radio frequency signal, and controls the local oscillator source module to generate the first local oscillator signal; during the down-conversion test of the mixer, the controller controls the radio frequency transceiver switching module to be in a state of amplifying the radio frequency signal, and controls the intermediate frequency transceiver The switching module is in a state of attenuating the intermediate frequency signal, and controls the local oscillator source module to generate a second local oscillator signal.

In a third aspect, an embodiment of the present application provides a computer program product that, when the computer program product runs on a mixer testing device, enables the mixer testing device to perform the mixing described in any one of the second aspects above. device test method.

It can be understood that, for the beneficial effects of the foregoing second aspect to the third aspect, reference may be made to the relevant descriptions in the foregoing first aspect, and details are not described herein again.

The mixer testing device and method provided by the embodiments of the present application include: a vector network analyzer, an intermediate frequency transceiver switching module, a radio frequency transceiver switching module, a local oscillator source module and a controller, the vector network analyzer respectively It is connected with the intermediate frequency transceiver switching module and the radio frequency transceiver switching module to generate intermediate frequency signals or radio frequency signals, and perform parameter testing on the received radio frequency signals or intermediate frequency signals. The intermediate frequency transceiver switching module, RF transceiver switching module, and local oscillator source module are respectively It is connected with the mixer to be tested, and is used to amplify or attenuate intermediate frequency signals, amplify or attenuate radio frequency signals, and generate local oscillator signals. to control the above modules. The mixer testing device provided by this application can realize the control of signal amplification or attenuation, realize up-conversion test of the mixer under test without changing the hardware connection, can improve the test stability of the mixer, and shorten the test time. In order to improve the test efficiency.

It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the specification.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only for the present application. In some embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 is a structural schematic diagram of a mixer;

2 is a schematic structural diagram of a mixer testing device provided by an embodiment of the present application;

3 is a schematic structural diagram of an intermediate frequency transceiver switching module provided by an embodiment of the present application;

4 is a schematic structural diagram of a radio frequency transceiver switching module provided by an embodiment of the present application;

5 is a schematic structural diagram of a local oscillator source module provided by an embodiment of the present application;

FIG. 6 is a schematic flowchart of a mixer testing method provided by an embodiment of the present application.

Detailed ways

The present application will be more clearly described below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the function of the present application, but do not limit the present application in any form. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application. These all belong to the protection scope of the present application.

It is to be understood that, when used in this specification and the appended claims, the term "comprising" indicates the presence of the described feature, integer, step, operation, element and/or component, but does not exclude one or more other The presence or addition of features, integers, steps, operations, elements, components and/or sets thereof.

It will also be understood that, as used in this specification and the appended claims, the term "and/or" refers to and including any and all possible combinations of one or more of the associated listed items.

In the description of the specification of the present application and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the description, and should not be construed as indicating or implying relative importance.

References in this specification to "one embodiment" or "some embodiments" and the like mean that a particular feature, structure or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in other embodiments," etc. in various places in this specification are not necessarily All refer to the same embodiment, but mean "one or more but not all embodiments" unless specifically emphasized otherwise. The terms "including", "including", "having" and their variants mean "including but not limited to" unless specifically emphasized otherwise.

In addition, the "plurality" mentioned in the embodiments of the present application should be interpreted as two or more.

With the continuous development of society and technology, communication plays an increasingly important role in people's work and life, and communication products have also become important tools in social production and daily life. In the field of radio communication, the quality of communication products depends on the design and implementation method of radio frequency communication hardware. As a key component of radio frequency communication hardware, the linearity of the mixer determines the dynamic range of the link before and after the frequency conversion, the frequency conversion loss determines the gain of the link before and after the frequency conversion, and the spur determines the index requirements of the filter of the transmitting and receiving links , it can be seen that the linearity, frequency conversion loss and stray of the mixer play a decisive role in the performance index of the whole machine, so it is very important to test the parameters of the mixer.

The mixer is a three-port radio frequency device (see Figure 1), which consists of an intermediate frequency port P1, a radio frequency port P2, and a local oscillator port P3. The frequency mixing processing is performed on the oscillating signal, and the frequency mixing processing can also be performed on the radio frequency signal input from the radio frequency port P2 and the local oscillator signal input from the local oscillator port P3. Since the IF port P1 and the RF port P2 have different frequencies, and the local oscillator port P3 has high power, its fast scan test has always been a key challenge in the RF and microwave fields. The existing test of the mixer parameters is completed by using two signal sources and one spectrum, which has the problems of limited mixer parameters, unstable test and low test efficiency.

Based on the above problems, an embodiment of the present application provides a mixer testing device, which includes a vector network analyzer, an intermediate frequency transceiver switching module, a radio frequency transceiver switching module, a local oscillator source module, and a controller. The vector network analyzer is respectively connected with the IF transceiver switching module and the RF transceiver switching module to generate IF signals or RF signals, and perform parameter testing on the received RF signals or IF signals. The intermediate frequency transceiver switching module is connected with the mixer to be tested, and is used for amplifying or attenuating the intermediate frequency signal. The RF transceiver switching module is connected with the mixer to be tested, and is used for amplifying or attenuating the RF signal. The local oscillator source module is connected to the mixer to be tested, and is used to generate the local oscillator signal. The controller is respectively connected with the intermediate frequency transceiver switching module, the radio frequency transceiver switching module and the local oscillator source module, and is used for controlling the above modules. It can realize the control of signal amplification or attenuation, and realize the up-conversion test of the mixer under test without changing the hardware connection, which can improve the test stability, shorten the test time, and thus improve the test efficiency.

FIG. 2 is a schematic structural diagram of a mixer testing apparatus provided by an embodiment of the present application. As shown in FIG. 2 , the mixer testing apparatus 10 includes: a vector network analyzer 20 , an intermediate frequency transceiver switching module 30 , a radio frequency transceiver switching module 40 , a local oscillator source module 50 and a controller 60 .

The first port A of the vector network analyzer 20 is connected to the first signal port IF-P1 of the intermediate frequency transceiver switching module 30 , and the second port B is connected to the fourth signal port RF-P2 of the radio frequency transceiver switching module 40 . The vector network analyzer 20 is used for generating an intermediate frequency signal and performing a parametric test on the received radio frequency signal, or generating a radio frequency signal and performing a parametric test on the received intermediate frequency signal.

The second signal port IF-P2 of the intermediate frequency transceiver switching module 30 is connected to the intermediate frequency port of the mixer under test (not shown), and the intermediate frequency transceiver switching module 30 is used for amplifying or attenuating the intermediate frequency signal. The third signal port RF-P1 of the radio frequency transceiver switching module 40 is connected to the radio frequency port of the mixer to be tested, and the radio frequency transceiver switching module 40 is used for amplifying or attenuating the radio frequency signal. The output port LO-RF of the local oscillator source module 50 is connected to the local oscillator port of the mixer to be tested, and the local oscillator source module 50 is used for generating a local oscillator signal.

The controller 60 is respectively connected with the intermediate frequency transceiver switch module 30, the radio frequency transceiver switch module 40 and the local oscillator source module 50, and is used to control the intermediate frequency transceiver switch module 30 to amplify or attenuate the intermediate frequency signal, and to control the radio frequency transceiver switch module 40 to amplify or attenuate the radio frequency The signal, and, control the local oscillator source module 50 to generate a local oscillator signal.

Exemplarily, the controller 60 may also be connected to the vector network analyzer 20 to control the vector network analyzer 20 to generate an intermediate frequency signal and perform parameter testing on the received radio frequency signal, or to control the vector network analyzer 20 Generate RF signals and perform parametric tests on the received IF signals. Specifically, the controller 60 also controls the power and frequency of the intermediate frequency signal generated by the vector network analyzer 20 , or controls the power and frequency of the radio frequency signal generated by the vector network analyzer 20 . The controller 60 is connected to the vector network analyzer 20 , the intermediate frequency transceiver switching module 30 , the radio frequency transceiver switching module 40 and the local oscillator source module 50 through a wired connection.

Optionally, testing the parameters of the mixer to be tested includes testing the linearity, conversion loss and spuriousness of the mixer.

It should be noted that the vector network analyzer 20 performs parameter testing on the received radio frequency signal or intermediate frequency signal, wherein the above received radio frequency signal is the radio frequency signal obtained after being mixed and processed by the mixer to be tested. The intermediate frequency signal is the intermediate frequency signal obtained after being processed by the mixer to be tested.

In a possible implementation manner, a schematic structural diagram of the intermediate frequency transceiver switching module is shown in FIG. 3 . Referring to FIG. 3 , the intermediate frequency transceiver switching module 30 further includes: a first intermediate frequency switch SW1 , a second intermediate frequency switch SW2 , a first power amplifier AMP1 and a first power attenuator ATT1 .

One end of the first intermediate frequency switch SW1 is connected to the first signal port IF-P1, the other end is connected to the input end of the first power amplifier AMP1, the output end of the first power amplifier AMP1 is connected to the second intermediate frequency switch SW2, and the second intermediate frequency switch The other end of SW2 is connected to the second signal port IF-P2. The output end of the first power attenuator ATT1 is connected to the first intermediate frequency switch SW1, and the input end is connected to the second intermediate frequency switch SW2.

Optionally, the first intermediate frequency switch SW1, the second intermediate frequency switch SW2 and the first power amplifier AMP1 constitute an intermediate frequency amplification channel, and the intermediate frequency amplification channel is used for amplifying the intermediate frequency signal. The above-mentioned first intermediate frequency switch SW1, second intermediate frequency switch SW2 and first power attenuator ATT1 constitute an intermediate frequency attenuation channel, and the intermediate frequency attenuation channel is used for attenuating intermediate frequency signals.

Exemplarily, the first signal port IF-P1 and the second signal port IF-P2 are signal input and output ports, and the first intermediate frequency switch SW1 and the second intermediate frequency switch SW2 are used to switch the signal channel, that is, to realize the intermediate frequency amplification channel and The switching of the intermediate frequency attenuation channel can be composed of an intermediate frequency switch chip. The first power amplifier AMP1 may be composed of an active amplifier chip, and the first power attenuator ATT1 may be composed of a passive attenuation chip or a passive resistance network.

Optionally, the intermediate frequency transceiver switching module 30 further includes a first control port S1 and a first power port L1. The first control port S1 is connected to the controller 60, and the controller 60 is configured to control the amplification or attenuation of the intermediate frequency signal by controlling the level state of the first control port S1. The first control port S1 is also connected to the first intermediate frequency switch SW1 and the second intermediate frequency switch SW2, so that the first intermediate frequency switch SW1 and the second intermediate frequency switch SW2 can realize the intermediate frequency amplification channel and intermediate frequency attenuation according to the level state of the first control port S1 channel switching. For example, when the controller 60 controls the level state of the first control port S1 to be a high level, the first intermediate frequency switch SW1 and the second intermediate frequency switch SW2 switch to the intermediate frequency amplifying channel according to the high level state of the first control port S1 to achieve IF signal amplification.

The first power port L1 is used to supply power to the active circuit in the intermediate frequency transceiver switching module 30 , wherein the above-mentioned active circuit is the first power amplifier AMP1 .

In a possible implementation manner, a schematic structural diagram of a radio frequency transceiver switching module is shown in FIG. 4 . 4 , the radio frequency transceiver switching module 40 further includes: a third radio frequency switch SW3, a fourth radio frequency switch SW4, a second power amplifier AMP2, a third power amplifier AMP3, a second power attenuator ATT2 and a third power attenuator ATT3.

One end of the fourth radio frequency switch SW4 is connected to the fourth signal port RF-P2, the other end is connected to the input end of the third power amplifier AMP3, and the output end of the third power amplifier AMP3 is connected to the input end of the third power attenuator ATT3, The output end of the third power attenuator ATT3 is connected to the input end of the second power amplifier AMP2, the output end of the second power amplifier AMP2 is connected to the third radio frequency switch SW3, and the other end of the third radio frequency switch SW3 is connected to the third signal port RF -P1 connection. The output end of the second power attenuator ATT2 is connected to the fourth radio frequency switch SW4, and the input end is connected to the third radio frequency switch SW3.

Optionally, the above-mentioned third radio frequency switch SW3, fourth radio frequency switch SW4, second power amplifier AMP2, third power amplifier AMP3 and third power attenuator ATT3 constitute a radio frequency amplification channel, and the radio frequency amplification channel is used for amplifying radio frequency signals. The third radio frequency switch SW3, the fourth radio frequency switch SW4 and the second power attenuator ATT2 form a radio frequency attenuation channel, and the radio frequency attenuation channel is used to attenuate radio frequency signals.

Exemplarily, the third signal port RF-P1 and the fourth signal port RF-P2 are signal input and output ports, and the third radio frequency switch SW3 and the fourth radio frequency switch SW4 are used to realize the switching of the signal channel, that is, to realize the radio frequency amplification channel and The switching of the radio frequency attenuation channel can be constituted by a radio frequency switch chip. The second power amplifier AMP2 and the third power amplifier AMP3 may be composed of active amplifier chips, and the second power attenuator ATT2 and the third power attenuator ATT3 may be composed of passive attenuation chips or passive resistance networks.

Optionally, the radio frequency transceiver switching module 40 further includes a second control port S2 and a second power port L2. The second control port S2 is connected to the controller 60, and the controller 60 is configured to control the amplification or attenuation of the radio frequency signal by controlling the level state of the second control port S2. The second control port S2 is also connected to the third radio frequency switch SW3 and the fourth radio frequency switch SW4, so that the third radio frequency switch SW3 and the fourth radio frequency switch SW4 can realize the radio frequency amplification channel and the radio frequency attenuation according to the level state of the second control port S2 channel switching. For example, when the controller 60 controls the level state of the second control port S2 to be a high level, the third radio frequency switch SW3 and the fourth radio frequency switch SW4 switch to the radio frequency amplification channel according to the high level state of the second control port S2, so as to realize RF signal amplification.

The second power port L2 is used to supply power to the active circuits in the radio frequency transceiver switching module 40 , wherein the above-mentioned active circuits are the second power amplifier AMP2 and the third power amplifier AMP3 .

In a possible implementation manner, a schematic structural diagram of the local oscillator source module is shown in FIG. 5 . Referring to FIG. 5, the local oscillator source module 50 further includes: a local oscillator source LO, a fourth power amplifier AMP4, a power level converter LO-DET, and a power detection control chip CO.

One end of the local oscillator source LO is connected to the input end of the fourth power amplifier AMP4, and the output end of the fourth power amplifier AMP4 is connected to the output port LO-RF. One end of the power level converter LO-DET is connected to the local oscillator source LO, the other end is connected to the power detection control chip CO, and the other end of the power detection control chip CO is connected to the output end of the fourth power amplifier AMP4. The local oscillator source LO is connected to the power detection control chip CO.

Optionally, the local oscillation source LO is used to generate the original oscillation signal, and the fourth power amplifier AMP4 is used to amplify the power of the original oscillation signal generated by the local oscillation source LO, so as to obtain the amplified original oscillation signal, that is, to obtain the local oscillation signal, The power detection and control chip CO is used to detect the power of the original vibration signal, control the frequency of the original vibration signal, and control the amplification factor of the fourth power amplifier AMP4. Among them, the detection of the power of the original vibration signal can timely find out whether the local oscillator source LO or the circuit is faulty, so as to avoid failure to find the damage or failure of the local oscillator source LO or the circuit in time; control the amplification factor of the fourth power amplifier AMP4 to make The local oscillator source module 50 can output the amplified original oscillator signal, that is, output the local oscillator signal. The power detection control chip CO is also used to detect whether the local oscillator source LO is locked, so that the mixer to be tested can be tested when the local oscillator source LO is in the locked state, that is, the locked state indicates that the local oscillator source LO state is stable at this time, and it can be Test the mixer under test. In addition, the power detection control chip CO is also used to control the power of the original vibration signal. The power level converter LO-DET is used to convert the power of the original vibration signal generated by the local oscillator source LO into a level, so that the power detection control chip CO detects the power of the original vibration signal according to the level.

The local oscillator source module 50 integrates the detection of the power of the original vibration signal and the control of the frequency of the original vibration signal, which improves the stability of the test of the mixer.

Exemplarily, the local oscillator source LO may be composed of a frequency source chip, the fourth power amplifier AMP4 may be composed of an active amplifier chip, and the power level converter LO-DET may be composed of a detector chip and an ADC (analog-to-digital conversion) chip. , the power detection control chip CO can be composed of a single chip microcomputer or an FPGA (Field Programmable Gate Array).

Optionally, the local oscillator source module 50 further includes a third control port S3 and a third power port L3. The third control port S3 is respectively connected to the controller 60 and the power detection control chip CO, and the controller 60 is used to send control information to the third control port S3, and the control information is used to control the local oscillator by controlling the power detection control chip CO The frequency and power of the signal; at the same time, the power detection control chip CO sends the detected power and frequency of the original vibration signal to the controller 60 through the third control port S3.

The third power port L3 is used to supply power to the active circuit in the local oscillator source module 50 , wherein the above-mentioned active circuit is the fourth power amplifier AMP4 and the local oscillator source LO.

It should be noted that the parameters to be tested for the mixer to be tested include the linearity, conversion loss and spurious of the mixer. The power and frequency, and the magnification of the fourth power amplifier are set according to this parameter.

It should be noted that, in practical applications, before testing the mixer under test, the mixer test setup also needs to be calibrated. Specifically, in the calibration of the intermediate frequency transceiver switching module, the first port of the vector network analyzer is connected to the first signal port of the intermediate frequency transceiver switching module, and the second port is connected to the second signal port of the intermediate frequency transceiver switching module. The intermediate frequency transceiver switching module switches to the state of attenuating the intermediate frequency signal, the vector network analyzer generates the intermediate frequency signal from the second port, and tests the attenuated intermediate frequency signal to obtain the first attenuation; the intermediate frequency transceiver switching module switches to the state of amplifying the intermediate frequency signal , the vector network analyzer generates an intermediate frequency signal from the first port, and tests the amplified intermediate frequency signal to obtain the first 1dB compression point and the first gain. The first attenuation, the first 1dB compression point and the first gain are sent to the controller for storage for subsequent test compensation of the mixer under test.

Optionally, in the calibration of the radio frequency transceiver switch module, the second port of the vector network analyzer is connected to the fourth signal port of the radio frequency transceiver switch module, and the first port is connected to the third signal port of the radio frequency transceiver switch module. The RF transceiver switching module switches to the state of attenuating the RF signal, the vector network analyzer generates the RF signal from the first port, and tests the attenuated RF signal to obtain the second attenuation; the RF transceiver switching module switches to the state of amplifying the RF signal , the vector network analyzer generates a radio frequency signal from the second port, and tests the amplified radio frequency signal to obtain a second 1dB compression point and a second gain. The second attenuation, the second 1dB compression point and the second gain are sent to the controller for storage for subsequent test compensation of the mixer under test.

Exemplarily, in the calibration of the local oscillator source module, the first port or the second port of the vector network analyzer is connected to the output port of the local oscillator source module. The power detection control chip detects the state of the local oscillator source, and when the local oscillator source is in the locked state, controls the local oscillator source to generate the original oscillator signal according to the preset frequency and preset power, and controls the amplification factor of the fourth power amplifier from small to large Increase in sequence, for example, sequentially control the magnification of the fourth power amplifier to be 2, 4, 7, 8, 16 or other magnifications to amplify the original vibration signal, and the vector network analyzer will receive the amplified original The vibration signal is tested to obtain the actual power of the amplified original vibration signal, and the amplification factor of the fourth power amplifier is corresponding to the actual power one-to-one to obtain the local vibration signal comparison table. Send the local oscillator signal comparison table to the controller to save for subsequent testing of the mixer under test.

This is because the power of the original oscillator signal actually generated by the local oscillator source may deviate from the preset power, so it is necessary to make a one-to-one correspondence between the amplification factor of the fourth power amplifier and the actual power to determine the local oscillator signal comparison table.

In practical applications, during the up-conversion test of the mixer, the vector network analyzer generates the first intermediate frequency signal from the first port, and the intermediate frequency transceiver switching module amplifies the first intermediate frequency signal, and the amplified first intermediate frequency The signal is sent to the mixer under test, the local oscillator source module generates a first local oscillation signal, and sends the first local oscillation signal to the mixer under test. The radio frequency transceiver switching module attenuates the received first radio frequency signal from the mixer under test, and sends the attenuated first radio frequency signal to the vector network analyzer, wherein the first radio frequency signal is amplified by the first radio frequency signal. The intermediate frequency signal and the first local oscillator signal are obtained after being mixed and processed by the mixer to be tested. The second port of the vector network analyzer receives the attenuated first radio frequency signal and performs a parameter test on the attenuated first radio frequency signal, and performs a parameter test on the attenuated first radio frequency signal. Based on the first 1dB compression point, the first gain and the second attenuation, the parameters obtained by testing are tested and compensated to obtain the first parameter of the mixer.

Optionally, the controller controls the intermediate frequency transceiver switch module to amplify the intermediate frequency signal, controls the radio frequency transceiver switch module to attenuate the radio frequency signal, and controls the local oscillator source module to generate the first local oscillator signal.

It should be noted that when testing different parameters of the mixer under test, the power and frequency of the first intermediate frequency signal and the first local oscillator signal, and the amplification factor of the fourth power amplifier are set according to the parameters, that is, the mixing frequency under test is set. Different parameters of the amplifier correspond to different amplification factors of the first intermediate frequency signal, the first local oscillator signal and the fourth power amplifier. Specifically, the amplification factor of the fourth power amplifier can be set according to the local oscillator signal comparison table. For example, when testing the linearity, the local oscillator source module needs to output a local oscillator signal with a power of 5dB. After querying the local oscillator signal comparison table Table, when the amplification factor of the fourth power amplifier is 2, the corresponding actual power is 5.2dB, which is closest to the power of the required local oscillator signal, which is 5dB, so the amplification factor of the fourth power amplifier can be set to 2.

Exemplarily, during the down-conversion test of the mixer, the vector network analyzer generates the second radio frequency signal from the second port, the radio frequency transceiver switching module amplifies the second radio frequency signal, and the amplified second radio frequency signal is It is sent to the mixer to be tested, and the local oscillator source module generates a second local oscillation signal, and sends the second local oscillation signal to the mixer to be tested. The intermediate frequency transceiver switching module attenuates the received second intermediate frequency signal from the mixer under test, and sends the attenuated second intermediate frequency signal to the vector network analyzer, wherein the second intermediate frequency signal is amplified by the second intermediate frequency signal. The radio frequency signal and the second local oscillator signal are obtained after mixing and processing by the mixer to be tested. The first port of the vector network analyzer receives the attenuated second intermediate frequency signal and performs parameter testing on the attenuated second intermediate frequency signal, and performs a parameter test on the attenuated second intermediate frequency signal. Based on the first attenuation, the second 1dB compression point and the second gain, the parameters obtained by testing are tested and compensated to obtain the second parameter of the mixer.

Optionally, the controller controls the radio frequency transceiver switching module to amplify the radio frequency signal, controls the intermediate frequency transceiver switch module to attenuate the intermediate frequency signal, and controls the local oscillator source module to generate a second local oscillator signal.

When testing different parameters of the mixer under test, the power and frequency of the second RF signal and the second local oscillator signal, and the amplification factor of the fourth power amplifier are set according to the parameters, that is, the different parameters of the mixer under test correspond to Different amplification factors of the second radio frequency signal, the second local oscillator signal and the fourth power amplifier. Specifically, the amplification factor of the fourth power amplifier can be set according to the local oscillator signal comparison table.

It should be noted that during the mixer up-conversion test and the mixer down-conversion test of the mixer under test, the power detection control chip detects whether the local oscillator source is in a locked state, and locks the local oscillator source, that is, the local oscillator. When the source state is stable, perform the mixer up-conversion test and the mixer down-conversion test on the mixer under test to avoid the inaccurate test that may be caused by testing the mixer under test when the local oscillator source is in an unlocked state .

The mixer testing device provided by the embodiment of the present application can realize the control of signal amplification or attenuation, realize up-conversion test and down-conversion test of the mixer under test without changing the hardware connection, and improve the test of the mixer Efficiency, reduces the complexity of the test device and the test cost, and shortens the test time. At the same time, the detection of the power of the original vibration signal and the control of the frequency of the original vibration signal are integrated in the mixer test device, which improves the stability of the test of the mixer.

FIG. 6 is a schematic flowchart of a mixer testing method provided by an embodiment of the present application. The above mixer testing method is applied to a mixer testing device. As shown in Figure 6, the mixer test method includes:

Step 101 , during the frequency up-conversion test of the mixer, the vector network analyzer generates a first intermediate frequency signal from the first port.

Step 102: The intermediate frequency transceiver switching module amplifies the first intermediate frequency signal, and sends the amplified first intermediate frequency signal to the mixer to be tested; the local oscillator source module generates the first local oscillator signal, and sends the first local oscillator signal to the Send the signal to the mixer under test; the radio frequency transceiver switching module attenuates the first radio frequency signal received from the mixer under test, and sends the attenuated first radio frequency signal to the vector network analyzer.

Step 103: The second port of the vector network analyzer receives the attenuated first radio frequency signal and performs a parameter test on the attenuated first radio frequency signal to obtain the first parameter of the mixer.

Step 104 , during the down-conversion test of the mixer, the vector network analyzer generates a second radio frequency signal from the second port.

Step 105: The radio frequency transceiver switching module amplifies the second radio frequency signal, and sends the amplified second radio frequency signal to the mixer to be tested; the local oscillator source module generates a second local oscillator signal, and transmits the second local oscillator signal to the second radio frequency signal. Send to the mixer under test; the intermediate frequency transceiver switching module attenuates the second intermediate frequency signal received from the mixer under test, and sends the attenuated second intermediate frequency signal to the vector network analyzer.

Step 106: The first port of the vector network analyzer receives the attenuated second intermediate frequency signal and performs a parameter test on the attenuated second intermediate frequency signal to obtain the second parameter of the mixer.

Steps 101-103 define the process of performing the mixer up-conversion test on the mixer under test, and steps 104-106 define the process of performing the mixer down-conversion test on the mixer under test. It can be understood that those skilled in the art can adjust the sequence of the above steps according to actual needs. For example, steps 104 to 106 can be executed before steps 101 to 103 .

Optionally, the above-mentioned mixer testing apparatus may be the mixer testing apparatus provided in any embodiment of the present application. The first radio frequency signal is obtained by mixing the amplified first intermediate frequency signal and the first local oscillator signal by the mixer to be tested, and the second intermediate frequency signal is obtained by the amplified second radio frequency signal and the second local oscillator signal. The measurement mixer is obtained after mixing processing.

In a possible implementation manner, during the frequency up-conversion test of the mixer, the controller controls the intermediate frequency transceiver switching module to be in a state of amplifying the intermediate frequency signal, and controls the radio frequency transceiver switching module to be in a state of attenuating the radio frequency signal, and controls the local oscillator The source module generates a first local oscillator signal. During the down-conversion test of the mixer, the controller controls the RF transceiver switch module to amplify the RF signal, and controls the IF transceiver switch module to attenuate the IF signal, and controls the local oscillator source module to generate a second local oscillator signal.

It should be noted that, in practical applications, the mixer test setup needs to be calibrated before the mixer up-conversion test and the mixer down-conversion test are performed on the mixer under test. The specific implementation process and principles of steps 101 to 106 in the embodiments of the present application and the calibration of the mixer testing apparatus may refer to the foregoing embodiments, which will not be repeated here.

The mixer testing method provided by the embodiment of the present application can perform up-conversion test and down-conversion test on the mixer under test, improve the test stability and test efficiency of the mixer, reduce the test cost, and shorten the test time.

It should be understood that the size of the sequence numbers of the steps in the above embodiments does not mean the sequence of execution, and the execution sequence of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

The above-mentioned embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the above-mentioned embodiments, those of ordinary skill in the art should understand that: it can still be used for the above-mentioned implementations. The technical solutions described in the examples are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the within the protection scope of the present invention.

Claims (10)

1. A mixer testing apparatus, comprising: the system comprises a vector network analyzer, an intermediate frequency transceiving switching module, a radio frequency transceiving switching module, a local vibration source module and a controller;

the vector network analyzer is used for generating an intermediate frequency signal and performing parameter test on the received radio frequency signal, or generating a radio frequency signal and performing parameter test on the received intermediate frequency signal;

a second signal port of the intermediate frequency transceiving switching module is connected with an intermediate frequency port of the mixer to be tested, and the intermediate frequency transceiving switching module is used for amplifying or attenuating the intermediate frequency signal;

a third signal port of the radio frequency transceiving switching module is connected with a radio frequency port of the mixer to be tested, and the radio frequency transceiving switching module is used for amplifying or attenuating radio frequency signals;

the output port of the local oscillation source module is connected with the local oscillation port of the mixer to be tested, and the local oscillation source module is used for generating local oscillation signals;

the controller is respectively connected with the intermediate frequency receiving and transmitting switching module, the radio frequency receiving and transmitting switching module and the local oscillation source module and is used for controlling the intermediate frequency receiving and transmitting switching module to amplify or attenuate intermediate frequency signals, controlling the radio frequency receiving and transmitting switching module to amplify or attenuate radio frequency signals and controlling the local oscillation source module to generate local oscillation signals.

2. The mixer testing apparatus of claim 1, wherein the intermediate frequency transceiving switching module further comprises: the power amplifier comprises a first intermediate frequency switch, a second intermediate frequency switch, a first power amplifier and a first power attenuator;

one end of the first intermediate frequency switch is connected with the first signal port, the other end of the first intermediate frequency switch is connected with the input end of the first power amplifier, the output end of the first power amplifier is connected with the second intermediate frequency switch, and the other end of the second intermediate frequency switch is connected with the second signal port;

the output end of the first power attenuator is connected with the first intermediate frequency switch, and the input end of the first power attenuator is connected with the second intermediate frequency switch.

3. The mixer testing apparatus of claim 2, wherein the first if switch, the second if switch and the first power amplifier form an if amplification path, and the if amplification path is configured to amplify the if signal;

the first intermediate frequency switch, the second intermediate frequency switch and the first power attenuator form an intermediate frequency attenuation channel, and the intermediate frequency attenuation channel is used for attenuating intermediate frequency signals.

4. The mixer test apparatus of claim 1, wherein the rf transceiver switching module further comprises: the radio frequency switch is connected with the first power amplifier, the second radio frequency switch is connected with the second power amplifier, and the third radio frequency switch is connected with the fourth power amplifier;

one end of the fourth radio frequency switch is connected with the fourth signal port, the other end of the fourth radio frequency switch is connected with the input end of the third power amplifier, the output end of the third power amplifier is connected with the input end of the third power attenuator, the output end of the third power attenuator is connected with the input end of the second power amplifier, the output end of the second power amplifier is connected with the third radio frequency switch, and the other end of the third radio frequency switch is connected with the third signal port;

the output end of the second power attenuator is connected with the fourth radio frequency switch, and the input end of the second power attenuator is connected with the third radio frequency switch.

5. The mixer test apparatus of claim 4, wherein the third RF switch, the fourth RF switch, the second power amplifier, the third power amplifier, and the third power attenuator form an RF amplifying channel, and the RF amplifying channel is configured to amplify an RF signal;

the third radio frequency switch, the fourth radio frequency switch and the second power attenuator form a radio frequency attenuation channel, and the radio frequency attenuation channel is used for attenuating radio frequency signals.

6. The mixer testing apparatus of claim 1, wherein the local oscillator module further comprises: the vibration source, the fourth power amplifier, the power level converter and the power detection control chip;

one end of the local vibration source is connected with the input end of the fourth power amplifier, and the output end of the fourth power amplifier is connected with the output port;

one end of the power level converter is connected with the local vibration source, the other end of the power level converter is connected with the power detection control chip, and the other end of the power detection control chip is connected with the output end of the fourth power amplifier;

the local vibration source is connected with the power detection control chip.

7. The mixer testing apparatus of claim 6, wherein the local oscillator source is configured to generate a local oscillator signal;

the fourth power amplifier is used for amplifying the original vibration signal to obtain a local vibration signal;

the power detection control chip is used for detecting the power of the original vibration signal, controlling the frequency of the original vibration signal and controlling the amplification factor of the fourth power amplifier.

8. The mixer testing device according to claim 7, wherein the intermediate frequency transceiving switching module further comprises a first control port and a first power port, the radio frequency transceiving switching module further comprises a second control port and a second power port, and the local oscillation source module further comprises a third control port and a third power port;

the controller is respectively connected with the first control port, the second control port and the third control port;

the controller is used for controlling the amplification or attenuation of the intermediate frequency signal by controlling the level state of the first control port, controlling the amplification or attenuation of the radio frequency signal by controlling the level state of the second control port, and sending control information to the third control port; the control information is used for controlling the frequency and the power of the local oscillator signal by controlling the power detection control chip;

the first power supply port is used for supplying power to an active circuit in the intermediate frequency transceiving switching module, the second power supply port is used for supplying power to an active circuit in the radio frequency transceiving switching module, and the third power supply port is used for supplying power to an active circuit in the local oscillation source module.

9. A mixer test method applied to the mixer test apparatus according to any one of claims 1 to 8, the method comprising:

when the up-conversion test of the frequency mixer is carried out, the vector network analyzer generates a first intermediate frequency signal from a first port;

the intermediate frequency receiving and transmitting switching module amplifies the first intermediate frequency signal and sends the amplified first intermediate frequency signal to a mixer to be tested; the local oscillation source module generates a first local oscillation signal and sends the first local oscillation signal to the frequency mixer to be tested; the radio frequency receiving and transmitting switching module attenuates a received first radio frequency signal from a mixer to be tested and transmits the attenuated first radio frequency signal to a vector network analyzer, wherein the first radio frequency signal is obtained by mixing the amplified first intermediate frequency signal and the first local oscillator signal through the mixer to be tested;

a second port of the vector network analyzer receives the attenuated first radio frequency signal and performs parameter test on the attenuated first radio frequency signal to obtain a first parameter of the frequency mixer;

when the mixer down-conversion test is carried out, the vector network analyzer generates a second radio-frequency signal from the second port;

the radio frequency receiving and transmitting switching module amplifies the second radio frequency signal and sends the amplified second radio frequency signal to a mixer to be tested; the local oscillation source module generates a second local oscillation signal and sends the second local oscillation signal to the frequency mixer to be tested; the intermediate frequency receiving and transmitting switching module attenuates a received second intermediate frequency signal from a mixer to be tested and transmits the attenuated second intermediate frequency signal to a vector network analyzer, wherein the second intermediate frequency signal is obtained by mixing the amplified second radio frequency signal and the second local oscillator signal through the mixer to be tested;

and a first port of the vector network analyzer receives the attenuated second intermediate frequency signal and performs parameter test on the attenuated second intermediate frequency signal to obtain a second parameter of the mixer.

10. The mixer test method of claim 9, further comprising:

when the up-conversion test of the frequency mixer is carried out, the controller controls the intermediate frequency receiving and transmitting switching module to be in an intermediate frequency signal amplifying state, controls the radio frequency receiving and transmitting switching module to be in a radio frequency signal attenuating state, and controls the local vibration source module to generate a first local vibration signal;

when the down-conversion test of the frequency mixer is carried out, the controller controls the radio frequency receiving and transmitting switching module to be in a state of amplifying radio frequency signals, controls the intermediate frequency receiving and transmitting switching module to be in a state of attenuating intermediate frequency signals, and controls the local vibration source module to generate second local vibration signals.

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