CN115941076A - System for realizing cascade connection multifunctional radio frequency vector receiving and transmitting test - Google Patents
System for realizing cascade connection multifunctional radio frequency vector receiving and transmitting test Download PDFInfo
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Abstract
The invention relates to a system for realizing a cascaded multifunctional radio frequency vector transceiving test, which comprises a baseband unit, a digital signal processing unit and a measurement unit, wherein the baseband unit is used for realizing digital signal processing and calculating a measurement result; the vector receiving and transmitting unit realizes half-duplex radio frequency double receiving and double transmitting; the frequency spectrum analysis unit realizes the frequency spectrum test of the signal; the vector network test unit realizes the port standing wave test of the DUT; the controllable voltage unit provides a direct current voltage source with programmable voltage; the current measuring unit measures the output current of the direct current voltage source; and the multifunctional matrix switch is connected with the vector transceiving unit, the frequency spectrum analysis unit and the vector network test unit, is used for switching multiple ports and multiple functions, and realizes different test tasks through different switch combinations. The system for realizing the cascade connection multifunctional radio frequency vector transceiving test has the advantages of simple circuit type, reduced hardware complexity, capability of realizing vector transceiving, frequency spectrum measurement and vector network test by single equipment, capability of realizing power consumption and current test for the DUT power supply and greatly reduced cost.
Description
Technical Field
The invention relates to the field of wireless communication, in particular to the field of vector transceiving test, and particularly relates to a system for realizing a cascaded multifunctional radio frequency vector transceiving test.
Background
In the batch production process of chips, unit circuits, modules and complete machines based on wireless communication, a large number of tests are required to ensure that the functions and performances of the chips, the unit circuits, the modules and the complete machines meet the requirements. Different Devices Under Test (DUTs) are complex in terms of test item requirements, such as power consumption testing, radio frequency S parameter testing, non-linear testing, and some system performance capabilities, such as EVM, sensitivity testing, and the like. Generally, a test system composed of different test devices, such as a vector network analyzer, a signal analyzer, a vector signal generator, etc., is built according to different DUTs, and then various test tasks of the DUTs are realized by developing special test software. The test system realized in this way has the following problems:
1) The test system has poor construction flexibility, and different DUTs need different test equipment to be collocated;
2) The test system occupies a large volume and is high in cost. The adopted test equipment is independent equipment;
3) The testing speed is low, different devices are difficult to realize direct control from internal hardware units, and the testing efficiency is low;
4) The above causes increase in the total test cost.
According to the test requirements, the invention provides a novel multifunctional vector transceiving test device which has a full radio frequency test function, has 8 transceiving ports in a single device, and can realize parallel multi-path test by cascading expansion.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a system for realizing the cascaded multifunctional radio frequency vector transceiving test, which is simple and convenient to operate, low in complexity and wide in application range.
In order to achieve the above object, the system for implementing the cascaded multifunctional radio frequency vector transceiving test of the present invention is as follows:
the system for realizing the cascade connection multifunctional radio frequency vector receiving and transmitting test is mainly characterized by comprising the following components:
the baseband unit is used for realizing digital signal processing, calculating a measurement result and controlling a control interface of each unit and external data communication;
the vector receiving and transmitting unit is connected with the baseband unit and is used for realizing half-duplex radio frequency double receiving and double transmitting;
the frequency spectrum analysis unit is connected with the baseband unit and used for realizing the frequency spectrum test of the signal;
the vector network testing unit is connected with the baseband unit and used for realizing the port standing wave test of the DUT;
the controllable voltage unit is connected with the baseband unit and used for providing a direct-current voltage source with programmable voltage;
the current measuring unit is connected with the controllable voltage unit and is used for measuring the output current of the direct-current voltage source;
and the multifunctional matrix switch is connected with the vector transceiving unit, the frequency spectrum analysis unit and the vector network test unit, is used for switching multiple ports and multiple functions, and realizes different test tasks through different switch combinations.
Preferably, the vector transceiver unit includes two identical rf transceiver circuits, each of which includes a receiving channel, a transmitting channel and a transceiver switch, the receiving channel and the transmitting channel are connected to the transceiver switch, and the circuits are respectively operated in a receiving state or a transmitting state by switching the receiving channel and the transmitting channel.
Preferably, the digital signal processing device comprises a low-pass filter, a low-noise amplifier, an attenuator, an IQ demodulator and an analog-to-digital converter, wherein the low-pass filter is connected with the transceiving switch and used for suppressing out-of-band signals, the low-noise amplifier is selectively communicated with the low-pass filter through a radio frequency switch and used for improving the sensitivity of a receiving channel, the radio frequency attenuator is selectively connected with the low-noise amplifier through a radio frequency switch and used for improving radio frequency to receive high-power signals, and the demodulator is connected with the radio frequency attenuator and used for decomposing input radio frequency signals into two paths of orthogonal baseband signals, respectively transmitting the two paths of orthogonal baseband signals into the two analog-to-digital converters and transmitting the two paths of orthogonal baseband signals to a baseband unit for processing.
Preferably, the transmission channel includes a digital-to-analog converter, an IQ modulator, a power amplifier, an attenuator, and a band-pass filter, wherein an input end of the digital-to-analog converter is connected to the baseband unit, an output end of the digital-to-analog converter is connected to the IQ modulator, and is configured to receive a digital IQ signal of the baseband unit and convert the digital IQ signal into an analog baseband IQ signal, and enter the IQ modulator, the power amplifier is connected to the IQ modulator and is configured to boost a maximum transmission power of the transmission channel, the attenuator is connected to the power amplifier and is configured to reduce a minimum transmission power of the transmission channel, and the band-pass filter is connected to the attenuator and is configured to suppress spurious output signals.
Preferably, each of the radio frequency transceiver circuits further includes a local oscillator, the demodulator of the receiving channel and the modulator of the transmitting channel of each of the radio frequency transceiver circuits are both connected to the local oscillator, and the local oscillators of the two radio frequency transceiver circuits are relatively independent and respectively operate at different frequencies.
Preferably, the spectrum analysis unit includes a radio frequency switch, two first mixers, and a second analog-to-digital converter, an output end of the radio frequency switch is connected to the two first mixers, the two first mixers are connected to the second analog-to-digital converter through an amplifier, an output end of the second analog-to-digital converter is connected to the baseband unit, the radio frequency switch divides an input signal into two paths for processing, the first mixers frequency-convert the two paths of signals to a specified intermediate frequency, and the second analog-to-digital converter receives and digitizes the signal amplified by the amplifier and transmits the signal to the baseband unit.
Preferably, the vector network testing unit includes a reference source, a directional coupler, a second mixer and a third analog-to-digital converter, an output end of the reference source is connected to the directional coupler, output ends of the directional coupler are respectively connected to the second mixer, an output end of the second mixer is connected to the third analog-to-digital converter, an output end of the third analog-to-digital converter is connected to the baseband unit, a signal of the reference source is output after passing through the directional coupler, the directional coupler mixes a coupling signal and a transmitting signal with a local oscillator respectively, the coupling signal and the transmitting signal are converted into intermediate frequency signals, and the intermediate frequency signals enter the third analog-to-digital converter respectively and are digitized and transmitted to the baseband unit.
The system for realizing the cascade connection multifunctional radio frequency vector transceiving test has the advantages of simple circuit type and reduced hardware complexity, can realize vector transceiving, frequency spectrum measurement and vector network test by single equipment, can supply power to a DUT (device under test) to realize power consumption and current test, and greatly reduces the equipment volume and cost. The system is expandable, and multi-port cascade expansion can be easily realized. The test tasks are convenient to switch, and the quick switching of different test tasks can be realized. The direct control of the hardware circuit can be realized in the test, the test speed is improved to the maximum extent, and the test efficiency is improved.
Drawings
Fig. 1 is a block diagram of a system for implementing a cascadable multi-function rf vector transceiving test according to the present invention.
Fig. 2 is a block diagram of a vector transceiver unit of a system for implementing a cascadable multi-function rf vector transceiver test according to the present invention.
Fig. 3 is a diagram showing a spectrum analysis unit of a system for implementing a cascadable multi-function rf vector transceiving test according to the present invention.
FIG. 4 is a block diagram of a vector network test unit of the system for implementing a cascadable multi-function RF vector transmit/receive test according to the present invention.
Fig. 5 is a block diagram of a multi-function matrix switch of a system for implementing a cascadable multi-function rf vector transceiving test according to the present invention.
Fig. 6 is a block diagram of a baseband unit of a system for implementing a cascadable multi-function rf vector transceiving test according to the present invention.
FIG. 7 is a schematic diagram illustrating the scalability of a system for implementing a cascadable multi-function RF vector transceiving test according to the present invention.
Detailed Description
In order to more clearly describe the technical contents of the present invention, the following further description is given in conjunction with specific embodiments.
The system for realizing the cascade connection multifunctional radio frequency vector transceiving test comprises a baseband unit, a data processing unit and a data processing unit, wherein the baseband unit is used for realizing digital signal processing, calculating a measurement result and controlling a control interface of each unit and external data communication;
the vector receiving and transmitting unit is connected with the baseband unit and is used for realizing half-duplex radio frequency double receiving and double transmitting;
the frequency spectrum analysis unit is connected with the baseband unit and is used for realizing the frequency spectrum test of the signal;
the vector network testing unit is connected with the baseband unit and is used for realizing the port standing wave test of the DUT;
the controllable voltage unit is connected with the baseband unit and used for providing a direct-current voltage source with programmable voltage;
the current measuring unit is connected with the controllable voltage unit and is used for measuring the output current of the direct-current voltage source;
and the multifunctional matrix switch is connected with the vector transceiving unit, the frequency spectrum analysis unit and the vector network test unit, is used for switching multiple ports and multiple functions, and realizes different test tasks through different switch combinations.
Preferably, the vector transceiver unit includes two identical rf transceiver circuits, each of which includes a receiving channel, a transmitting channel and a transceiver switch, the receiving channel and the transmitting channel are connected to the transceiver switch, and the circuits are respectively operated in a receiving state or a transmitting state by switching the receiving channel and the transmitting channel.
Preferably, the digital signal processing device comprises a low-pass filter, a low-noise amplifier, an attenuator, an IQ demodulator and an analog-to-digital converter, wherein the low-pass filter is connected with the transceiving conversion switch and used for suppressing out-of-band signals, the low-noise amplifier is selectively communicated with the low-pass filter through a radio frequency switch and used for improving the sensitivity of a receiving channel, the radio frequency attenuator is selectively connected with the low-noise amplifier through the radio frequency switch and used for improving the radio frequency to receive high-power signals, and the demodulator is connected with the radio frequency attenuator and used for decomposing input radio frequency signals into two paths of orthogonal baseband signals, respectively transmitting the two paths of orthogonal baseband signals into the two analog-to-digital converters, and transmitting the two paths of orthogonal baseband signals to the baseband unit for processing.
Preferably, the transmission channel includes a digital-to-analog converter, an IQ modulator, a power amplifier, an attenuator, and a band-pass filter, the digital-to-analog converter has an input end connected to the baseband unit and an output end connected to the IQ modulator for receiving the digital IQ signal of the baseband unit and converting the digital IQ signal into an analog baseband IQ signal to enter the IQ modulator, the power amplifier is connected to the IQ modulator for increasing the maximum transmission power of the transmission channel, the attenuator is connected to the power amplifier for decreasing the minimum transmission power of the transmission channel, and the band-pass filter is connected to the attenuator for suppressing the spurious output signal.
Preferably, each of the radio frequency transceiver circuits further includes a local oscillator, the demodulator of the receiving channel and the modulator of the transmitting channel of each of the radio frequency transceiver circuits are both connected to the local oscillator, and the local oscillators of the two radio frequency transceiver circuits are relatively independent and respectively operate at different frequencies.
Preferably, the spectrum analysis unit includes a radio frequency switch, two first mixers, and a second analog-to-digital converter, an output end of the radio frequency switch is connected to the two first mixers, the two first mixers are connected to the second analog-to-digital converter through an amplifier, an output end of the second analog-to-digital converter is connected to the baseband unit, the radio frequency switch divides an input signal into two paths for processing, the first mixers frequency-convert the two paths of signals to a designated intermediate frequency, and the second analog-to-digital converter receives and digitizes the signal amplified by the amplifier and transmits the signal to the baseband unit.
Preferably, the vector network testing unit comprises a reference source, a directional coupler, a second mixer and a third analog-to-digital converter, an output end of the reference source is connected with the directional coupler, output ends of the directional coupler are respectively connected with the second mixer, an output end of the second mixer is connected with the third analog-to-digital converter, an output end of the third analog-to-digital converter is connected with the baseband unit, a signal of the reference source is output after passing through the directional coupler, the directional coupler mixes a coupling signal and a transmitting signal with a local oscillator respectively, the coupling signal and the transmitting signal are converted into intermediate frequency signals, and then the intermediate frequency signals enter the third analog-to-digital converter respectively to be digitized and are transmitted to the baseband unit.
In the embodiment of the present invention, please refer to fig. 1, which is a system configuration diagram of the present device. The method mainly comprises the following steps:
input and output of the device: including trigger inputs (Trig IN), trigger outputs (Trig OUT), reference inputs (REF IN), reference outputs (REF OUT), a mesh (LAN), radio frequency transmit-receive ports (RF 1-RF 8), and power supply outputs (DC OUT). The function definition of each interface is as follows:
trig IN: the trigger input is used for receiving trigger output signals of other devices/equipment or a DUT (device under test) to realize synchronous testing;
trig OUT: trigger output, a trigger synchronization signal sent by the device;
REF IN: a reference input receiving a reference signal of an external device for synchronization of an internal phase locked loop and a clock;
REF OUT: reference output, namely sending an internal reference signal by the equipment to realize synchronization of different frequency sources of the system;
network interface (LAN): the standard RJ45 network interface supports 10M/100M/1000M self-adaptation and is used for controlling equipment and issuing/reading test data;
RF1-RF8: each port has the functions of half-duplex vector transceiving, noise source output, frequency spectrum measurement input and port standing wave test. The specific internal structure of the vector transceiver module is shown in a matrix switch unit (MSW), wherein RF11-RF4 share one internal vector transceiver module, and RF5-RF8 share the other vector transceiver module.
DC Out: the programmable voltage supply outputs a voltage output provided to the DUT.
The system of the device comprises a baseband unit (BB), a vector transceiving unit (VST), a spectrum analysis unit (SA), a vector network test unit (VNA), a controllable voltage unit (AVS), a current measurement unit (AMT) and a multifunctional Matrix Switch (MSW). The functions of each module are as follows:
baseband unit (BB): the digital signal processing, the calculation of the measurement result, the control interface of each unit and the external data communication are realized;
vector transceiver unit (VST): realizing half-duplex radio frequency double receiving and double sending;
spectrum analysis unit (SA): realizing the frequency spectrum test of the signal;
vector network test unit (VNA): realizing port standing wave test of the DUT;
controllable voltage unit (AVS): providing a direct current voltage source with programmable voltage;
current measurement unit (AMT): measuring the output current of a direct current voltage source;
multifunction Matrix Switch (MSW): the multi-port and multi-functional switching can realize different testing tasks through different switch combinations.
Fig. 2 is a structural diagram of a vector transceiver unit, which is a unit for dual-transceiver (2T 2R) composed of two identical rf transceiver circuits. The working mode is explained by taking RTX1 as an example:
the radio frequency SW1 is a receiving and transmitting change-over switch, and the circuit works in a receiving state or a transmitting state respectively by switching different channels; the receiving channel mainly comprises a low pass filter (LPF 1), a low noise amplifier (LNA 1), an attenuator, an IQ demodulator (DEM 1) and an analog-to-digital converter (ADC). The low pass filter LPF1 mainly rejects out-of-band signals and prevents the introduction of additional spurs into the demodulator. The LNA1 is used to increase the sensitivity of the receiving channel and can be gated by the rf switches (SW 2 and SW 3). The radio frequency attenuator is used for improving the capability of receiving high-power signals by radio frequency and expanding the measurement range of the whole receiving channel. A demodulator (DEM 1) decomposes an input radio frequency signal into analog I and Q orthogonal baseband signals, and the two orthogonal baseband signals respectively enter an analog-to-digital converter (ADC 1) and an ADC2 for digitalization and then enter a baseband unit (BB) for processing;
the transmitting channel mainly comprises a digital-to-analog converter (DAC), an IQ modulator (MOD 1), a power amplifier (PA 1), an attenuator (ATT 2) and a band-pass filter (BPF 1). Digital IQ signals from a baseband unit are converted into analog baseband IQ signals through digital-to-analog converters (DAC 1 and DAC 2), and after the analog baseband IQ signals enter an IQ modulator (MOD 1), a power amplifier (PA 1) is used for increasing the maximum transmission power of a transmission channel, an attenuator (ATT 2) is used for reducing the minimum generation power of the generation channel, and a band-pass filter is used for suppressing output signal stray;
the Local Oscillators (LO) required by the demodulator of the receiving channel and the modulator of the transmitting channel share one local oscillator circuit, and the local oscillators (LO 1 and LO 2) of the 2 transceiver units are relatively independent and can respectively work at different frequencies.
Fig. 3 is a diagram of a spectrum analysis unit, which is mainly used for measuring the spectrum of an input signal, such as spurs and harmonics. The working frequency range of the frequency mixer is limited, an input signal is divided into two paths for processing through a radio frequency switch (SW 11), the two paths of signals are respectively subjected to frequency conversion to a specified intermediate frequency through the frequency mixers (MIX 1 and MIX 2), and a local oscillator (LO 3) required by the frequency mixer is shared. The intermediate frequency signal enters an analog-to-digital converter (ADC 5) after being amplified for digitalization, and then enters a baseband processing unit.
FIG. 4 is a diagram of a vector network test cell configuration, primarily for implementing testing of DUT port standing waves. It consists of a reference source (RFS), a directional Coupler (CPL), mixers (MIX 3 and MIX 4) and an ADC. The reference source (RFS) signal is output after passing through the directional Coupler (CPL), which mixes the coupled signal and the transmit signal with the local oscillator (LO 4) respectively (fig. 5 is a structural diagram of a multifunctional matrix switch, which mainly consists of 4 SP4T radio frequency switches (SW 13-SW 16) and 3 SP2T radio frequency switches (SW 17-SW 19) and a noise source (NSS). The noise source (NSS) generates a broadband noise signal for measuring a noise coefficient, which is distributed to all test ports (RF 1-RF 8) after passing through the radio frequency switches. Similarly, all radio frequency ports (RF 1-RF 8) can pass through the matrix switch to enter the spectrum analysis unit and the vector network analysis unit.
Fig. 6 is a baseband unit configuration diagram, which mainly comprises a main controller, a clock generation circuit, a DDR memory and a DSP/FPGA unit, wherein the main controller is responsible for the control of the whole device and the external communication (LAN port), and the clock generator generates clocks required by each ADC or DAC and provides phase-locked loop reference signals for each local oscillator signal. The DSP/FPGA circuit mainly realizes the control of hardware and the processing and testing tasks of digital signals.
Fig. 7 shows the expandability of the device, and for the test of a large number of multiple ports, the test of the multiple ports can be realized through the cascade connection of the device, so that the test efficiency is improved.
For a specific implementation scheme of this embodiment, reference may be made to relevant descriptions in the foregoing embodiments, which are not described herein again.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present invention, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present invention, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by suitable instruction execution devices. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, and the corresponding program may be stored in a computer readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a separate product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The system for realizing the cascade connection multifunctional radio frequency vector transceiving test has the advantages of simple circuit type, reduced hardware complexity, capability of realizing vector transceiving, frequency spectrum measurement and vector network test by single equipment, capability of realizing power consumption and current test for the DUT power supply, and greatly reduced equipment volume and cost. The system is expandable, and multi-port cascade expansion can be easily realized. The test tasks are convenient to switch, and the quick switching of different test tasks can be realized. The direct control of a hardware circuit can be realized in the test, the test speed is improved to the greatest extent, and the test efficiency is improved.
In this specification, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.
Claims (7)
1. A system for implementing a cascadable multi-function rf vector transceiving test, said system comprising:
the baseband unit is used for realizing digital signal processing, calculating a measurement result and controlling a control interface of each unit and external data communication;
the vector receiving and transmitting unit is connected with the baseband unit and is used for realizing half-duplex radio frequency double receiving and double transmitting;
the frequency spectrum analysis unit is connected with the baseband unit and used for realizing the frequency spectrum test of the signal;
the vector network testing unit is connected with the baseband unit and used for realizing the port standing wave test of the DUT;
the controllable voltage unit is connected with the baseband unit and used for providing a direct-current voltage source with programmable voltage;
the current measuring unit is connected with the controllable voltage unit and is used for measuring the output current of the direct-current voltage source;
and the multifunctional matrix switch is connected with the vector transceiving unit, the frequency spectrum analysis unit and the vector network test unit, is used for switching multiple ports and multiple functions, and realizes different test tasks through different switch combinations.
2. The system for implementing cascaded multi-functional radio frequency vector transceiving test of claim 1, wherein the vector transceiving unit comprises two identical radio frequency transceiving circuits, each of which comprises a receiving channel, a transmitting channel and a transceiving switch, the receiving channel and the transmitting channel are connected to the transceiving switch, and the circuits are enabled to operate in a receiving state or a transmitting state by switching the receiving channel and the transmitting channel.
3. The system of claim 2, wherein the receiving channel comprises 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 switch for suppressing out-of-band signals, the low noise amplifier is selectively connected to the low pass filter through a radio frequency switch for increasing the sensitivity of the receiving channel, the radio frequency attenuator is selectively connected to the low noise amplifier through a radio frequency switch for increasing the radio frequency to receive high power signals, the demodulator is connected to the radio frequency attenuator for splitting the input radio frequency signals into two paths of orthogonal baseband signals, and the two paths of orthogonal baseband signals are respectively transmitted to two analog-to-digital converters and transmitted to the baseband unit for processing.
4. The system according to claim 2, wherein the transmission channel comprises a digital-to-analog converter, an IQ modulator, a power amplifier, an attenuator, and a band pass filter, the digital-to-analog converter has an input connected to the baseband unit and an output connected to the IQ modulator for receiving the digital IQ signal from the baseband unit and converting the digital IQ signal into an analog baseband IQ signal, the power amplifier is connected to the IQ modulator for increasing the maximum transmission power of the transmission channel, the attenuator is connected to the power amplifier for reducing the minimum generation power of the generation channel, and the band pass filter is connected to the attenuator for suppressing spurious signals of the output signal.
5. The system for implementing cascaded multi-function radio frequency vector transceiving testing according to claim 2, wherein each radio frequency transceiving circuit further comprises a local oscillator, the demodulator of the receiving channel and the modulator of the transmitting channel of each radio frequency transceiving circuit are both connected to the local oscillator, and the local oscillators of the two radio frequency transceiving circuits are relatively independent and respectively operate at different frequencies.
6. The system for implementing the cascade connection multifunctional radio frequency vector transceiving test as claimed in claim 1, wherein the spectrum analysis unit comprises a radio frequency switch, two first mixers and a second analog-to-digital converter, an output end of the radio frequency switch is respectively connected with the two first mixers, the two first mixers are connected with the second analog-to-digital converter through an amplifier, an output end of the second analog-to-digital converter is connected with the baseband unit, the radio frequency switch divides an input signal into two paths for processing, the two paths of signals are converted to a designated intermediate frequency by the first mixers, and the signals amplified by the amplifier are received by the second analog-to-digital converter, digitized and transmitted to the baseband unit.
7. The system according to claim 1, wherein the vector network test unit comprises a reference source, a directional coupler, a second mixer, and a third analog-to-digital converter, an output terminal of the reference source is connected to the directional coupler, output terminals of the directional coupler are respectively connected to the second mixer, an output terminal of the second mixer is connected to the third analog-to-digital converter, an output terminal of the third analog-to-digital converter is connected to the baseband unit, a signal of the reference source is output after passing through the directional coupler, the directional coupler mixes a coupling signal and a transmission signal with a local oscillator, converts the signals into an intermediate frequency signal, and then enters the third analog-to-digital converter for digitization and passes through the baseband unit.
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| CN117607554A (en) * | 2023-12-15 | 2024-02-27 | 成都玖锦科技有限公司 | Vector signal comprehensive test module |
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| CN117607554A (en) * | 2023-12-15 | 2024-02-27 | 成都玖锦科技有限公司 | Vector signal comprehensive test module |
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