A system for realizing cascadable multifunctional RF vector transceiver test

Abstract

The present invention relates to a system for realizing cascadeable multifunctional radio frequency vector transceiver test, comprising a baseband unit for realizing digital signal processing and calculating measurement results; a vector transceiver unit for realizing half-duplex radio frequency dual-receive and dual-transmit; a spectrum analysis unit for realizing spectrum test of signals; a vector network test unit for realizing port standing wave test of DUT; a controllable voltage unit for providing a voltage programmable DC voltage source; a current measurement unit for measuring the output current of the DC voltage source; and a multifunctional matrix switch connected with the vector transceiver unit, the spectrum analysis unit and the vector network test unit for switching multiple ports and multiple functions, and realizing different test tasks through different switch combinations. The system for realizing cascadeable multifunctional radio frequency vector transceiver test adopts the present invention, and the circuit type is concise, the hardware complexity is reduced, a single device can realize vector transceiver, spectrum measurement and vector network test, and can power DUT to realize power consumption and current test, and the cost is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the field of wireless communications, in particular to the field of vector transceiver testing, and specifically refers to a system for realizing cascaded multifunctional radio frequency vector transceiver testing. Background Art

[0002] Chips, unit circuits, modules and complete machines based on wireless communication applications require a lot of testing during their mass production process to ensure that their functions and performance meet the requirements. Different devices under test (DUT) have complex test item requirements, such as power consumption test, RF S parameter test, nonlinear test and some system performance tests such as EVM and sensitivity test. Usually, it is necessary to build a test system composed of different test equipment according to different DUTs, such as vector network analyzers, signal analyzers, vector signal generators, etc., and then develop dedicated test software to achieve various test tasks of DUT. The test system implemented in this way has the following problems:

[0003] 1) The test system has poor flexibility, and different DUTs require different test equipment to match;

[0004] 2) The test system takes up a large space and is expensive. The test equipment used is independent equipment;

[0005] 3) The test speed is low. It is difficult to directly control different devices from the internal hardware units, resulting in low test efficiency;

[0006] 4) The above reasons lead to an increase in the total testing cost.

[0007] According to the above test requirements, the present invention proposes a novel multifunctional vector transceiver test device, which has full RF test functions. A single device has 8 transceiver ports and can be cascaded and expanded to realize parallel multi-channel testing. Summary of the invention

[0008] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a system for realizing cascaded multifunctional RF vector transceiver testing which is simple to operate, low in complexity and has a wide range of applications.

[0009] In order to achieve the above object, the system for realizing cascadeable multifunctional RF vector transceiver test of the present invention is as follows:

[0010] The system for realizing cascadeable multifunctional radio frequency vector transceiver test has the following main features: the system comprises:

[0011] Baseband unit, used to realize digital signal processing, calculate measurement results, control the control interface of each unit and external data communication;

[0012] A vector transceiver unit, connected to the baseband unit, for realizing half-duplex RF dual-receive and dual-transmit;

[0013] A spectrum analysis unit, connected to the baseband unit, for implementing spectrum testing of signals;

[0014] A vector network test unit, connected to the baseband unit, for implementing a port standing wave test of the DUT;

[0015] A controllable voltage unit, connected to the baseband unit, and used to provide a DC voltage source with programmable voltage;

[0016] A current measuring unit, connected to the controllable voltage unit, for measuring the output current of the DC voltage source;

[0017] The multifunctional matrix switch is connected with the vector transceiver unit, the spectrum analysis unit and the vector network test unit, and is used for switching multiple ports and multiple functions, and realizing different test tasks through different switch combinations.

[0018] Preferably, the vector transceiver unit includes two identical RF transceiver circuits, each of which includes a receiving channel, a transmitting channel and a transceiver conversion switch. The receiving channel and the transmitting channel are both connected to the transceiver conversion switch. By switching the receiving channel and the transmitting channel, the circuit works in a receiving state or a transmitting state respectively.

[0019] Preferably, it includes a low-pass filter, a low-noise amplifier, an attenuator, an IQ demodulator and an analog-to-digital converter. The low-pass filter is connected to the transmit-receive conversion switch to suppress out-of-band signals. The low-noise amplifier can be selectively connected to the low-pass filter through a radio frequency switch to improve the sensitivity of the receiving channel. The radio frequency attenuator can be selectively connected to the low-noise amplifier through a radio frequency switch to improve the radio frequency reception of high-power signals. The demodulator is connected to the radio frequency attenuator to decompose the input radio frequency signal into two orthogonal baseband signals, and transmit them to two analog-to-digital converters respectively, and then transmit them to the baseband unit for processing.

[0020] Preferably, the transmission channel includes a digital-to-analog converter, an IQ modulator, a power amplifier, an attenuator and a bandpass filter. The input end of the digital-to-analog converter is connected to the baseband unit, and the output end is connected to the IQ modulator, for receiving the digital IQ signal of the baseband unit and converting it into an analog baseband IQ signal entering the IQ modulator. The power amplifier is connected to the IQ modulator to increase the maximum transmission power of the transmission channel. The attenuator is connected to the power amplifier to reduce the minimum transmission power of the transmission channel. The bandpass filter is connected to the attenuator to suppress output signal spurious.

[0021] Preferably, each of the RF transceiver circuits further includes a local oscillator, and the demodulator of the receiving channel and the modulator of the transmitting channel of each RF transceiver circuit are connected to the local oscillator. The local oscillators of the two RF transceiver circuits are relatively independent and operate at different frequencies respectively.

[0022] Preferably, the spectrum analysis unit includes a radio frequency switch, two first mixers, and a second analog-to-digital converter. The output end of the radio frequency switch is respectively connected to the two first mixers, the two first mixers are connected to the second analog-to-digital converter through an amplifier, and the output end of the second analog-to-digital converter is connected to the baseband unit. The radio frequency switch divides the input signal into two paths for processing, the first mixer converts the two signals to a specified intermediate frequency, and the second analog-to-digital converter receives the signal amplified by the amplifier and digitizes it, and transmits it to the baseband unit.

[0023] Preferably, the vector network test unit includes a reference source, a directional coupler, a second mixer and a third analog-to-digital converter, the output end of the reference source is connected to the directional coupler, the output ends of the directional coupler are respectively connected to the second mixer, the output end of the second mixer is connected to the third analog-to-digital converter, the output end of the third analog-to-digital converter is connected to the baseband unit, the signal of the reference source is output after passing through the directional coupler, the directional coupler mixes the coupled signal and the transmitted signal with the local oscillator respectively, converts them into intermediate frequency signals, and then enters the third analog-to-digital converter for digitization and is transmitted to the baseband unit.

[0024] The system for realizing cascaded multifunctional RF vector transceiver test of the present invention has a concise circuit type and reduced hardware complexity. A single device can realize vector transceiver, spectrum measurement and vector network test, and can power the DUT to realize power consumption and current test, and the device size and cost are greatly reduced. The system is scalable and can easily realize multi-port cascade expansion. The test tasks are convenient to switch, and fast conversion of different test tasks can be realized. During the test, direct control of the hardware circuit can be realized, and the test speed and test efficiency can be maximized. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The present invention is a structural diagram of a system for implementing cascaded multifunctional radio frequency vector transceiver testing.

[0026] Figure 2 This is a diagram showing the composition of a vector transceiver unit of a system for realizing cascaded multifunctional radio frequency vector transceiver testing of the present invention.

[0027] Figure 3 This is a diagram showing the composition of a spectrum analysis unit of a system for implementing cascaded multifunctional RF vector transceiver testing according to the present invention.

[0028] Figure 4 This is a diagram showing the composition of a vector network test unit of a system for realizing cascaded multifunctional radio frequency vector transceiver testing of the present invention.

[0029] Figure 5 The present invention is a diagram of the structure of a multifunctional matrix switch of a system for realizing cascaded multifunctional radio frequency vector transceiver testing.

[0030] Figure 6 This is a diagram of the baseband unit configuration of a system for implementing cascaded multifunctional RF vector transceiver testing according to the present invention.

[0031] Figure 7 The present invention is a schematic diagram of the scalability of the system for implementing cascaded multifunctional radio frequency vector transceiver testing. DETAILED DESCRIPTION

[0032] In order to more clearly describe the technical content of the present invention, further description is given below in conjunction with specific embodiments.

[0033] The system for realizing cascadeable multifunctional radio frequency vector transceiver test of the present invention includes a baseband unit for realizing digital signal processing, calculating measurement results, controlling the control interface of each unit and external data communication;

[0034] A vector transceiver unit, connected to the baseband unit, for realizing half-duplex RF dual-receive and dual-transmit;

[0035] A spectrum analysis unit, connected to the baseband unit, for implementing spectrum testing of signals;

[0036] A vector network test unit, connected to the baseband unit, for implementing a port standing wave test of the DUT;

[0037] A controllable voltage unit, connected to the baseband unit, and used to provide a DC voltage source with programmable voltage;

[0038] A current measuring unit, connected to the controllable voltage unit, for measuring the output current of the DC voltage source;

[0039] The multifunctional matrix switch is connected with the vector transceiver unit, the spectrum analysis unit and the vector network test unit, and is used for switching multiple ports and multiple functions, and realizing different test tasks through different switch combinations.

[0040] Preferably, the vector transceiver unit includes two identical RF transceiver circuits, each of which includes a receiving channel, a transmitting channel and a transceiver conversion switch. The receiving channel and the transmitting channel are both connected to the transceiver conversion switch. By switching the receiving channel and the transmitting channel, the circuit works in a receiving state or a transmitting state respectively.

[0041] Preferably, it includes a low-pass filter, a low-noise amplifier, an attenuator, an IQ demodulator and an analog-to-digital converter. The low-pass filter is connected to the transmit-receive conversion switch to suppress out-of-band signals. The low-noise amplifier can be selectively connected to the low-pass filter through a radio frequency switch to improve the sensitivity of the receiving channel. The radio frequency attenuator can be selectively connected to the low-noise amplifier through a radio frequency switch to improve the radio frequency reception of high-power signals. The demodulator is connected to the radio frequency attenuator to decompose the input radio frequency signal into two orthogonal baseband signals, and transmit them to two analog-to-digital converters respectively, and then transmit them to the baseband unit for processing.

[0042] Preferably, the transmission channel includes a digital-to-analog converter, an IQ modulator, a power amplifier, an attenuator and a bandpass filter. The input end of the digital-to-analog converter is connected to the baseband unit, and the output end is connected to the IQ modulator, for receiving the digital IQ signal of the baseband unit and converting it into an analog baseband IQ signal entering the IQ modulator. The power amplifier is connected to the IQ modulator to increase the maximum transmission power of the transmission channel. The attenuator is connected to the power amplifier to reduce the minimum transmission power of the transmission channel. The bandpass filter is connected to the attenuator to suppress output signal spurious.

[0043] Preferably, each of the RF transceiver circuits further includes a local oscillator, and the demodulator of the receiving channel and the modulator of the transmitting channel of each RF transceiver circuit are connected to the local oscillator. The local oscillators of the two RF transceiver circuits are relatively independent and operate at different frequencies respectively.

[0044] Preferably, the spectrum analysis unit includes a radio frequency switch, two first mixers, and a second analog-to-digital converter. The output end of the radio frequency switch is respectively connected to the two first mixers, the two first mixers are connected to the second analog-to-digital converter through an amplifier, and the output end of the second analog-to-digital converter is connected to the baseband unit. The radio frequency switch divides the input signal into two paths for processing, the first mixer converts the two signals to a specified intermediate frequency, and the second analog-to-digital converter receives the signal amplified by the amplifier and digitizes it, and transmits it to the baseband unit.

[0045] Preferably, the vector network test unit includes a reference source, a directional coupler, a second mixer and a third analog-to-digital converter, the output end of the reference source is connected to the directional coupler, the output ends of the directional coupler are respectively connected to the second mixer, the output end of the second mixer is connected to the third analog-to-digital converter, the output end of the third analog-to-digital converter is connected to the baseband unit, the signal of the reference source is output after passing through the directional coupler, the directional coupler mixes the coupled signal and the transmitted signal with the local oscillator respectively, converts them into intermediate frequency signals, and then enters the third analog-to-digital converter for digitization and is transmitted to the baseband unit.

[0046] In the specific implementation of the present invention, please refer to Figure 1 As shown, it is the system structure diagram of this device. It mainly includes the following contents:

[0047] The input and output of the device: including trigger input (Trig IN), trigger output (Trig OUT), reference input (REF IN), reference output (REF OUT), network port (LAN), RF transceiver port (RF1-RF8) and power output (DCOut). Functional definition of each interface:

[0048] Trig IN: trigger input, receiving the trigger output signal of other devices / equipment or DUT to achieve synchronous testing;

[0049] Trig OUT: Trigger output, the trigger synchronization signal sent by this device;

[0050] REF IN: Reference input, receiving the reference signal of the external device for synchronization of the internal phase-locked loop and clock;

[0051] REF OUT: Reference output, the device sends out an internal reference signal to achieve synchronization of different frequency sources in the system;

[0052] Network port (LAN): standard RJ45 network interface, supporting 10M / 100M / 1000M self-adaptation, used for equipment control and test data sending / reading;

[0053] RF1-RF8: RF transceiver ports, each port has half-duplex vector transceiver, noise source output, spectrum measurement input, and port standing wave test functions. Among them, RF11-RF4 share an internal vector transceiver module, and RF5-RF8 share another vector transceiver module. For the specific internal structure, see the matrix switch unit (MSW).

[0054] DC Out: Programmable voltage power supply output, voltage output provided by DUT.

[0055] The system structure of this device includes baseband unit (BB), vector transceiver unit (VST), spectrum analysis unit (SA), vector network test unit (VNA), controllable voltage unit (AVS), current measurement unit (AMT), and multi-function matrix switch (MSW). The functions of each module are:

[0056] Baseband unit (BB): realizes digital signal processing, calculation of measurement results, control interface of each unit and external data communication;

[0057] Vector transceiver unit (VST): realizes half-duplex RF dual-receive and dual-transmit;

[0058] Spectrum Analysis Unit (SA): realizes spectrum testing of signals;

[0059] Vector Network Test Unit (VNA): realizes the port standing wave test of DUT;

[0060] AVS: provides a DC voltage source with programmable voltage.

[0061] Current measurement unit (AMT): measures the output current of the DC voltage source;

[0062] Multi-function matrix switch (MSW): Multi-port and multi-function switching, different test tasks can be achieved through different switch combinations.

[0063] Figure 2 This is the structure diagram of the vector transceiver unit, which consists of two identical RF transceiver circuits to form a dual-receive dual-transmit (2T2R) unit. Take RTX1 as an example to illustrate its working method:

[0064] The RF SW1 is a transceiver conversion switch. By switching different channels, the circuit can work in the receiving or transmitting state respectively; the receiving channel mainly includes a low-pass filter (LPF1), a low-noise amplifier (LNA1), an attenuator and an IQ demodulator (DEM1) and an analog-to-digital converter (ADC). The low-pass filter LPF1 mainly suppresses out-of-band signals to prevent them from entering the demodulator and causing additional spurious signals. The low-noise amplifier LNA1 is used to improve the sensitivity of the receiving channel and can be selected through the RF switch (SW2 and SW3). The RF attenuator is used to improve the RF's ability to receive high-power signals and expand the measurement range of the entire receiving channel. The demodulator (DEM1) decomposes the input RF signal into two analog I and Q orthogonal baseband signals. After the two signals enter the analog-to-digital converters ADC1 and ADC2 for digitization, they enter the baseband unit (BB) for processing;

[0065] The transmission channel mainly consists of a digital-to-analog converter (DAC), an IQ modulator (MOD1), a power amplifier (PA1), an attenuator (ATT2), and a bandpass filter (BPF1). The digital IQ signal from the baseband unit is converted into an analog baseband IQ signal by the digital-to-analog converter (DAC1 and DAC2). After entering the IQ modulator (MOD1), the power amplifier (PA1) is used to increase the maximum transmission power of the transmission channel, the attenuator (ATT2) is used to reduce the minimum transmission power of the transmission channel, and the bandpass filter is used to suppress the output signal spurious;

[0066] The local oscillator (LO) required by the demodulator of the receiving channel and the modulator of the transmitting channel share a local oscillator circuit. The local oscillators (LO1 and LO2) of the two transceiver units are relatively independent and can operate at different frequencies respectively.

[0067] Figure 3 The figure shows the composition of the spectrum analysis unit, which is mainly used to measure the spectrum of the input signal, such as spurious and harmonic waves. The operating frequency range of the limited mixer is limited. The input signal is divided into two paths for processing by the RF switch (SW11). The two signals are converted to the specified intermediate frequency by the mixers (MIX1 and MIX2) respectively, and the local oscillator (LO3) required by the mixer is shared. After being amplified, the intermediate frequency signal enters the analog-to-digital converter (ADC5) for digitization and then enters the baseband processing unit.

[0068] Figure 4 This is a diagram of the vector network test unit, which is mainly used to test the standing wave of the DUT port. It consists of a reference source (RFS), a directional coupler (CPL), mixers (MIX3 and MIX4), and an ADC. The reference source (RFS) signal is output after passing through the directional coupler (CPL). The directional coupler mixes the coupled signal and the transmitted signal with the local oscillator (LO4) respectively ( Figure 5 This is the composition diagram of the multifunctional matrix switch, which mainly consists of 4 SP4T RF switches (SW13-SW16) and 3 SP2T RF switches (SW17-SW19) and a noise source (NSS). The noise source (NSS) generates a broadband noise signal for measuring the noise figure, which can be distributed to all test ports (RF1-RF8) after passing through the RF switch. Similarly, all RF ports (RF1-RF8) can enter the spectrum analysis unit and the vector network analysis unit through this matrix switch. As shown in the figure, the vector transceiver channel 1 (RTX1) can only be mapped to the RF ports RF1-RF4, and the vector transceiver channel 2 (RTX2) can only be mapped to the RF ports RF5-RF8.

[0069] Figure 6This is the baseband unit configuration diagram. It is mainly composed of the main controller, clock generation circuit, DDR memory and DSP / FPGA unit. The main controller is responsible for the control of the whole machine and external communication (LAN port). The clock generator generates the clock required by each ADC or DAC and provides a phase-locked loop reference signal for each local oscillator signal. The DSP / FPGA circuit mainly realizes hardware control and digital signal processing and testing tasks.

[0070] Figure 7 The scalability of this device is demonstrated. For large-scale multi-port testing, multi-port testing can be achieved by cascading the devices, thereby improving test efficiency.

[0071] The specific implementation scheme of this embodiment can refer to the relevant description in the above embodiment, which will not be repeated here.

[0072] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

[0073] It should be noted that, in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "plurality" refers to at least two.

[0074] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present invention belong.

[0075] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution device. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0076] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the corresponding program may be stored in a computer-readable storage medium, which, when executed, includes one of the steps of the method embodiment or a combination thereof.

[0077] In addition, each functional unit in each embodiment of the present invention may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0078] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.

[0079] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0080] The system for realizing cascaded multifunctional RF vector transceiver test of the present invention has a concise circuit type and reduced hardware complexity. A single device can realize vector transceiver, spectrum measurement and vector network test, and can power the DUT to realize power consumption and current test, and the device size and cost are greatly reduced. The system is scalable and can easily realize multi-port cascade expansion. The test tasks are convenient to switch, and fast conversion of different test tasks can be realized. During the test, direct control of the hardware circuit can be realized, and the test speed and test efficiency can be maximized.

[0081] In this specification, the present invention has been described with reference to specific embodiments thereof. However, it is apparent that various modifications and variations may be made without departing from the spirit and scope of the present invention. Therefore, the specification and drawings should be regarded as illustrative rather than restrictive.

Claims

1. A system for implementing cascadeable multifunctional radio frequency vector transceiver testing, characterized in that: The system comprises: Baseband unit, used to realize digital signal processing, calculate measurement results, control the control interface of each unit and external data communication; A vector transceiver unit, connected to the baseband unit, for realizing half-duplex RF dual-receive and dual-transmit; A spectrum analysis unit, connected to the baseband unit, for implementing spectrum testing of signals; A vector network test unit, connected to the baseband unit, for implementing a port standing wave test of the DUT; A controllable voltage unit, connected to the baseband unit, and used to provide a DC voltage source with programmable voltage; A current measuring unit, connected to the controllable voltage unit, for measuring the output current of the DC voltage source; A multifunctional matrix switch, connected to the vector transceiver unit, the spectrum analysis unit and the vector network test unit, for switching multiple ports and multiple functions, and realizing different test tasks through different switch combinations; The vector transceiver unit includes two identical radio frequency transceiver circuits, each of which includes a receiving channel, a transmitting channel and a transceiver conversion switch. The receiving channel and the transmitting channel are both connected to the transceiver conversion switch. By switching the receiving channel and the transmitting channel, the circuit works in a receiving state or a transmitting state respectively. The receiving channel includes a low-pass filter, a low-noise amplifier, a radio frequency attenuator, an IQ demodulator and an analog-to-digital converter. The low-pass filter is connected to the transmit-receive conversion switch to suppress out-of-band signals. The low-noise amplifier is connected to the low-pass filter through the radio frequency switch to improve the sensitivity of the receiving channel. The radio frequency attenuator is connected to the low-noise amplifier through the radio frequency switch to improve the radio frequency reception of high-power signals. The demodulator is connected to the radio frequency attenuator to decompose the input radio frequency signal into two orthogonal baseband signals, and transmit them to two analog-to-digital converters respectively, and then transmit them to the baseband unit for processing.

2. The system for implementing cascadeable multifunctional RF vector transceiver test according to claim 1, characterized in that: The transmitting channel includes a digital-to-analog converter, an IQ modulator, a power amplifier, a radio frequency attenuator and a bandpass filter. The input end of the digital-to-analog converter is connected to the baseband unit, and the output end is connected to the IQ modulator. It is used to receive the digital IQ signal of the baseband unit and convert it into an analog baseband IQ signal to enter the IQ modulator. The power amplifier is connected to the IQ modulator to increase the maximum transmitting power of the transmitting channel. The radio frequency attenuator is connected to the power amplifier to reduce the minimum generating power of the generating channel. The bandpass filter is connected to the radio frequency attenuator to suppress the output signal spurious.

3. The system for implementing cascadeable multifunctional RF vector transceiver test according to claim 1, characterized in that: Each of the RF transceiver circuits also includes a local oscillator. The demodulator of the receiving channel and the modulator of the transmitting channel of each RF transceiver circuit are connected to the local oscillator. The local oscillators of the two RF transceiver circuits are relatively independent and operate at different frequencies.

4. The system for implementing cascadeable multifunctional RF vector transceiver test according to claim 1, characterized in that: The spectrum analysis unit includes a radio frequency switch, two first mixers, and a second analog-to-digital converter. The output end of the radio frequency switch is respectively connected to the two first mixers, and the two first mixers are connected to the second analog-to-digital converter through an amplifier. The output end of the second analog-to-digital converter is connected to the baseband unit. The radio frequency switch divides the input signal into two paths for processing. The first mixer converts the two signals to a specified intermediate frequency. The second analog-to-digital converter receives the signal amplified by the amplifier and digitizes it, and transmits it to the baseband unit.

5. The system for implementing cascadeable multifunctional RF vector transceiver test according to claim 1, characterized in that: The vector network test unit includes a reference source, a directional coupler, a second mixer and a third analog-to-digital converter. The output end of the reference source is connected to the directional coupler, the output ends of the directional coupler are respectively connected to the second mixer, the output end of the second mixer is connected to the third analog-to-digital converter, the output end of the third analog-to-digital converter is connected to the baseband unit, the signal of the reference source is output after passing through the directional coupler, the directional coupler mixes the coupling signal and the transmission signal with the local oscillator respectively, converts them into intermediate frequency signals, enters the third analog-to-digital converter for digitization, and transmits them to the baseband unit.

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