Power supply driving device for external noise source and noise coefficient testing system

Abstract

The utility model discloses a power supply driving device for an external noise source and a noise coefficient testing system. The power supply driving device comprises a shell, a USB (Universal Serial Bus) connecting interface, a switch logic control module, a power supply management module and a switch circuit, the switch logic control module is used for establishing communication connection with an upper computer through the USB connection interface and responding to a switch control instruction output by the upper computer to send a switch control electric signal to the switch circuit, and the power management module is used for converting a direct-current power supply of the USB interface of the upper computer into a target level signal and then outputting the target level signal to the switch circuit. And the switch circuit is used for responding to the switch-on or switch-off of the switch control electric signal so as to send a driving pulse electric signal to the external noise source. The power supply driving device of the USB interface sends the driving pulse electric signal to the external noise source, so that the spectrum analyzer without a special noise source interface can be used in a noise coefficient test system, and the application scene of the spectrum analyzer is expanded; and different external noise sources can be flexibly replaced so as to adapt to different devices to be tested.

Description

Technical Field

[0001] The present application relates to the technical field of noise coefficient testing, and in particular to a power supply driving device and a noise coefficient testing system for an external noise source. Background Art

[0002] With the application and development of shortwave communication, people have put forward higher requirements on the ability of receivers to detect weak signals. The noise inside the receiver is the main obstacle that limits its ability to detect weak signals. In order to detect the performance of devices and measure the ability of communication equipment to receive weak signals, it is necessary to measure the noise characteristics of devices and equipment, which makes the testing and measurement of noise coefficient extremely important. For example, for receiving equipment such as radar, the noise coefficient is a very important indicator. Under the premise of not increasing the transmission power or the complexity of the system, the smaller the noise coefficient of the system, the longer the radar's range, so the rapid and accurate measurement of the noise coefficient is of great significance.

[0003] For amplifiers or other active devices, since there is noise in them, the signal-to-noise ratio at the output is different from the signal-to-noise ratio at the input. For this reason, the noise factor is used to measure the noise level of the amplifier itself. The definition of the noise factor is very simple and intuitive. The noise factor (F) of the network is defined as the SNR of the input signal divided by the SNR of the output signal, which can be expressed as:

[0004] F = (Si / Ni) / (So / No);

[0005] Among them, Si is the power of the input signal, So is the power of the output signal, Ni is the input noise power, No is the output noise power, and F is the noise factor.

[0006] The noise factor is expressed in decibels (dB):

[0007] (NF): NF = 10*log (F);

[0008] Where NF is the noise factor.

[0009] Minimizing the noise factor can reduce the impact of noise on the system. In daily life, we can see that noise can reduce the quality of TV pictures and the voice quality of wireless communications; in military equipment such as radar, noise can limit the effective range of the system; in digital communication systems, noise can increase the bit error rate of the system. Developers will optimize the signal-to-noise ratio of the entire system by increasing the signal or reducing the noise, among which reducing the noise of the receiver or making the receiver's noise factor indicators more practical.

[0010] The noise figure is often measured using a noise figure test system that uses the Y-factor method. The noise source (calibrated for the excess noise ratio) is connected in series with the device under test (DUT) or system under test (SUT) through a high-precision coaxial cable. At the other end of the device or system, there is some type of measurement system that provides two input noise levels to the DUT or SUT. This method tests the noise figure and scalar gain of the device under test and is suitable for spectrum analyzer and noise figure analyzer solutions. Please refer to Figure 1 and Figure 2 , which are the equipment connection diagrams for the noise coefficient test system calibration and the equipment connection diagrams for the noise coefficient test system testing, respectively, including a spectrum analyzer, a noise source, and a device under test. The noise source provides an accurate and stable noise excitation signal for the device under test. The size and stability of its noise ratio have a great influence on the noise coefficient measurement range and accuracy. In the noise coefficient test system, the spectrum analyzer needs to be equipped with a noise voltage source driver and a noise source communication interface. A spectrum analyzer that is not equipped with a noise voltage source driver cannot be used in a noise coefficient test system that uses the Y-factor method. Considering factors such as cost, equipment size, and heat dissipation, general spectrum analyzers will not be equipped with a noise voltage source driver as standard, which will obviously limit the application scenarios of the spectrum analyzer. Summary of the invention

[0011] The technical problem to be solved by this application is how to expand the application scenarios of the spectrum analyzer so that it can be used in the noise figure test system.

[0012] According to the first aspect, an embodiment provides a power driving device for an external noise source, including a housing, a USB connection interface, a switch logic control module, a power management module and a switch circuit;

[0013] The USB connection interface is arranged on the housing and is used to connect to a host computer so as to serve as a connection interface for serial communication between the host computer and the power drive device;

[0014] The power management module is connected between the switch circuit and the USB connection interface, and is used to output a target level signal to the switch circuit when the USB connection interface is connected to the host computer;

[0015] The switch logic control module is connected between the USB connection interface and the switch circuit, and is used to establish a communication connection with the host computer through the USB connection interface; when the switch logic control module establishes a communication connection with the host computer, the switch logic control module is also used to respond to a switch control instruction output by the host computer to send a switch control electrical signal to the switch circuit;

[0016] The switch circuit is used to be connected to the external noise source, and is used to respond to the switch control electrical signal to be turned on or off; when the switch circuit is turned on, the switch circuit outputs the target level signal output by the power management module to the external noise source, and otherwise stops outputting the target level signal, so as to send a driving pulse electrical signal of a preset frequency to the external noise source through the turning on and off of the switch circuit;

[0017] The power management module includes a first power circuit and a second power circuit; the first power circuit is connected between the USB connection interface and the second power circuit, and when the USB connection interface is electrically connected to the host computer, the second power circuit is used to obtain the direct current signal output by the USB interface of the host computer through the USB connection interface and send a power start electrical signal to the second power circuit;

[0018] The second power supply circuit is connected to the switch circuit, and the second power supply circuit is used to respond to the power start electrical signal, convert the DC signal output by the USB interface of the host computer into the target level signal, and send the target level signal to the switch circuit;

[0019] The switch control electrical signal is a pulse electrical signal. When the pulse electrical signal is at a high level, the switch circuit is turned on. When the pulse electrical signal is at a low level, the switch circuit is turned off.

[0020] In one embodiment, the switch circuit is electrically connected to the external noise source via a BNC connector provided on the housing; and the USB connection interface is a Type-B interface or a Type-C interface.

[0021] In one embodiment, the switch logic control module includes a USB controller and an IO logic controller; the USB controller is connected to the USB connection interface, and the USB controller is used to establish a communication connection with the host computer through the USB connection interface; the USB controller is also used to forward the switch control instruction to the IO logic controller;

[0022] The IO logic controller is connected to the switch circuit, and is used for converting the switch control instruction into the switch control electrical signal and then sending the switch control electrical signal to the switch circuit.

[0023] In one embodiment, the USB controller is further used to receive a power parameter setting instruction output by the host computer through the USB connection interface, and forward the power parameter setting instruction to the IO logic controller;

[0024] The IO logic controller is also connected to the second power supply circuit, and the IO logic controller is also used to output an electrical parameter setting electrical signal to the second power supply circuit in response to the power parameter setting instruction; the second power supply circuit is also used to change the voltage value of the output target level signal in response to the electrical parameter setting electrical signal.

[0025] In one embodiment, the switch logic control module further includes a memory; the memory is used to store the power parameter setting instruction and / or the switch control instruction.

[0026] In one embodiment, the IO logic controller is further configured to output the switch control electrical signal according to the power parameter setting instruction stored in the memory.

[0027] In one embodiment, the IO logic controller is further configured to output the switch control electrical signal according to the switch control instruction stored in the memory.

[0028] According to the second aspect, an embodiment provides a noise figure test system, comprising the power drive device as described above, a host computer, a spectrum analyzer and at least one external noise source;

[0029] The host computer is connected to the power drive device via a USB interface;

[0030] The power driving device is connected to the external noise source via a BNC connector;

[0031] The external noise source is used to be connected to the spectrum analyzer and a device under test in a time-sharing manner so as to measure the noise coefficient of the device under test by applying the Y-factor method.

[0032] In one embodiment, the host computer is a PC or the spectrum analyzer.

[0033] In one embodiment, the external noise source outputs different noise source signals according to the different frequencies of the driving pulse electrical signals output by the power driving device.

[0034] According to the power driving device of the above embodiment, an external noise source can be connected for testing by using a ready-made spectrum analyzer or a PC with a specified software version, thereby reducing the complexity of system construction and improving efficiency. The driving and use of the noise source can be realized without a dedicated spectrum analyzer, which greatly increases the application scope and scenarios of the noise source. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of equipment connection for noise figure test system calibration;

[0036] Figure 2This is a schematic diagram of equipment connection when testing the noise figure test system;

[0037] Figure 3 A structural connection block diagram of a power drive device in an embodiment;

[0038] Figure 4 A schematic diagram of equipment connection during testing of a noise figure test system in an embodiment;

[0039] Figure 5 A schematic diagram of equipment connection during testing of a noise figure test system in an embodiment;

[0040] Figure 6 The figure is a schematic diagram of the control flow interaction between the host computer and the power drive device in an embodiment. DETAILED DESCRIPTION

[0041] The present application is further described in detail below by specific embodiments in conjunction with the accompanying drawings. Wherein similar elements in different embodiments adopt associated similar element numbers. In the following embodiments, many detailed descriptions are intended to enable the present application to be better understood. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, and methods. In some cases, some operations related to the present application are not shown or described in the specification, in order to avoid the core part of the present application being overwhelmed by too much description, and for those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations based on the description in the specification and the general technical knowledge in the art.

[0042] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various implementations. At the same time, the steps or actions in the method description can also be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a required sequence, unless otherwise specified that a certain sequence must be followed.

[0043] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0044] In the noise figure test system, the noise source driver of the spectrum analyzer does not simply provide a voltage source, but requires a dedicated composite I2C bus interface to connect to the instrument and use the I2C bus to realize the on / off control of the intelligent noise source. In a noise figure test system that is not built with dedicated instruments, additional power supply and interface software / hardware support is required to realize the noise figure test, which not only increases the user's test cost, but also increases the user's test system establishment cycle and system complexity. In addition, if there is more than one I2C bus device on the measuring instrument, when two or more I2C bus devices have high-frequency real-time monitoring and information exchange, it is easy to cause bus device control conflicts, resulting in erroneous measurements, thereby reducing the stability of noise figure measurements.

[0045] In the embodiment of the present application, a drive pulse electrical signal is sent to an external noise source through a power driver of a USB interface, and a spectrum analyzer of any configuration can be used in a noise factor test system, thereby expanding the application scenarios of the spectrum analyzer.

[0046] Embodiment 1:

[0047] Please refer to Figure 3, is a structural connection block diagram of a power drive device in an embodiment, including a power drive device 1, a host computer 2 and an external noise source 3, wherein the power drive device 1 includes a housing, a USB connection interface 10, a switch logic control module 20, a power management module 30 and a switch circuit 40. The USB connection interface 10 is arranged on the housing, and is used to connect the host computer 2, so as to serve as a connection interface for serial communication between the host computer 2 and the power drive device 1. The power management module 30 is connected between the switch circuit 40 and the USB connection interface 10, and is used to output a target level signal to the switch circuit 40 when the USB connection interface 10 is connected to the host computer 2. The switch logic control module 20 is connected between the USB connection interface 10 and the switch circuit 40, and is used to establish a communication connection with the host computer 2 through the USB connection interface 10. After the switch logic control module 20 establishes a communication connection with the host computer 2, the switch logic control module 20 is also used to respond to a switch control instruction output by the host computer 2 to send a switch control electrical signal to the switch circuit 40. The switch circuit 40 is used to connect with the external noise source 3, and is used to respond to the switch control electrical signal to turn on or off. When the switch circuit 40 is turned on, the switch circuit 40 outputs the target level signal output by the power management module 30 to the external noise source 3, otherwise it stops outputting the target level signal, so as to send a driving pulse electrical signal of a preset frequency to the external noise source 3 through the conduction and disconnection of the switch circuit 40. The power management module 30 includes a first power circuit 31 and a second power circuit 32, the first power circuit 31 is connected between the USB connection interface 10 and the second power circuit 32, when the USB connection interface 10 is electrically connected to the host computer 2, the second power circuit 32 is used to obtain the direct current signal output by the USB interface of the host computer 2 through the USB connection interface 10 and send a power start electrical signal to the second power circuit 32. The second power circuit 32 is connected to the switch circuit 40, and the second power circuit 32 is used to respond to the power start electrical signal, convert the direct current signal output by the USB interface of the host computer 2 into a target level signal, and send the target level signal to the switch circuit 40. The switch control electrical signal is a pulse electrical signal. When the pulse electrical signal is at a high level, the switch circuit 40 is turned on. When the pulse electrical signal is at a low level, the switch circuit 40 is turned off. In one embodiment, the switch circuit 40 is electrically connected to the external noise source 3 through a BNC connector provided on the housing. In one embodiment, the USB connection interface 10 is a Type-B interface or a Type-C interface.

[0048] In one embodiment, the switch logic control module 20 includes a USB controller 31 and an IO logic controller 22. The USB controller 31 is connected to the USB connection interface 10. The USB controller 21 is used to establish a communication connection with the host computer 2 through the USB connection interface 10. The USB controller 21 is also used to forward the switch control instruction to the IO logic controller 22. The IO logic controller 22 is connected to the switch circuit 40. The IO logic controller 22 is used to convert the switch control instruction into a switch control electrical signal and then send the switch control electrical signal to the switch circuit 40. In one embodiment, the USB controller 21 is also used to receive the power parameter setting instruction output by the host computer 2 through the USB connection interface 10, and forward the power parameter setting instruction to the IO logic controller 22. The IO logic controller 22 is also connected to the second power circuit 32. The IO logic controller 22 is also used to respond to the power parameter setting instruction and output the electrical parameter setting electrical signal to the second power circuit 32. The second power circuit 32 is also used to respond to the electrical parameter setting electrical signal to change the voltage value of the output target level signal.

[0049] In one embodiment, the switch logic control module 20 further includes a memory 23, and the memory 23 is used to store power parameter setting instructions and / or switch control instructions. In one embodiment, the IO logic controller 22 is also used to output a switch control electrical signal according to the power parameter setting instructions stored in the memory 23. In one embodiment, the IO logic controller 22 is also used to output a switch control electrical signal according to the switch control instructions stored in the memory 23.

[0050] In one embodiment of the present application, a noise coefficient test system is also disclosed. Figure 4 and Figure 5 , respectively, are a schematic diagram of equipment connection during calibration of a noise coefficient test system in an embodiment and a schematic diagram of equipment connection during testing of a noise coefficient test system in an embodiment. The noise coefficient test system includes the power driver 1, a host computer 2, a spectrum analyzer 4 and at least one external noise source 3 as described above. The host computer 2 is connected to the power driver 1 via a USB interface, and the power driver 1 is connected to the external noise source 3 via a BNC connector. The external noise source 3 is used to connect to the spectrum analyzer 4 and a device under test 5 in a time-sharing manner to measure the noise coefficient of the device under test 5 using the Y factor method. In one embodiment, the host computer 2 is a PC or a spectrum analyzer. In one embodiment, the noise coefficient test system includes at least two external noise sources 3 with different noise parameters. In one embodiment, the external noise source 3 outputs different noise source signals according to the different frequencies of the driving pulse electrical signal output by the power driver 1.

[0051] The working mode of the noise figure testing system disclosed in the present application is described below through a specific embodiment.

[0052] The Y-factor technique is easy to use, especially when the noise source has a good source match and can be directly connected to the device under test, the accuracy of the test results is excellent. Therefore, in a test system that does not have a pulse signal driver, it is very important whether the noise source can be interconnected with the host computer through a power driver, so as to quickly and stably carry out the next step of testing.

[0053] The driving pulse signal that the power driver needs to input to the external noise source is set to +28V, and the noise coefficient, Y factor, equivalent noise temperature and other related indicators are measured with the spectrum analyzer. Figure 4 and Figure 5 As shown, the housing of the power driver device is provided with a Type-B female connector and a BNC female connector, and a USB Type-B male connector to USB Type-A male connector cable is provided for connecting the noise source driver device to a spectrum analyzer or a PC, and a BNC dual male connector cable is provided for connecting the power driver device to an external noise source. The USB Type-B connector is used to connect the host computer (spectrum analyzer / PC) for the input of USB power and control signals, and the BNC female connector outputs a +28V driving pulse electrical signal to provide input bias to the connected external noise source.

[0054] like Figure 3 As shown, the power management module includes the power supply device required to output the target level signal, and the switch logic control module includes an IO logic controller, a memory (Electrically Erasable Programmable read only memory, EEPROM) and a USB controller. The three modules in the switch logic control module are interconnected through an internal data bus, and the power is provided by the USB interface of the host computer. In addition, the USB controller communicates with the host computer via a USB connection interface. In one embodiment, the working process of the power drive device disclosed in the present application is:

[0055] First, the power driver module is connected to the host computer (spectrum analyzer / PC) through the USB adapter interface, and the power supply and access detection of the entire power driver device are completed at the same time. The IO logic controller inside the switch logic control module reads the initialization data information through the memory (EEPROM).

[0056] Then, the host computer detects the power driver module through the specified software configuration and loads the corresponding switch configuration parameters;

[0057] Finally, the host computer executes the specific frequency of the "on / off" control of the switch circuit through the USB interface. After the signal flow (switch control instruction or power parameter setting instruction) output by the host computer enters the switch logic control module, it is converted and analyzed by the USB controller and communicates with the IO logic controller through the internal bus. The IO logic controller converts the host computer's instructions into specific IO levels, controls the "on" and "off" of the downstream power supply device (power management module) and the switch circuit, and reads the memory information of the EEPROM through the internal bus. Among them, the USB controller and the EEPROM are integrated and packaged in a module device to realize the host computer's control of the switch and frequency output by the power drive device to the BNC. After the power management module is connected to the host computer through the USB interface with an adapter cable, the host computer provides a 5V level to the power management module. The 5V level is converted to the target level required for the input drive of the subsequent noise source through the power chip in the module, and the pulse current required for the drive is generated through the switch conversion.

[0058] Please refer to Figure 6 , is a schematic diagram of the control process interaction between the host computer and the power drive device in an embodiment, specifically including:

[0059] 1) If Figure 4 As shown in the figure, a noise source calibration mode environment is built, and a USB adapter is used to connect the power driver to the host computer (spectrum analyzer / PC), and power is supplied to the power driver. The IO logic controller inside the device reads the EEPROM solidified parameters through the data bus, performs initialization configuration, and is ready for standby.

[0060] 2) The software of the host computer determines the connection status of the power drive device through USB. If it is connected, it will be displayed on the UI interface and ready for the next step.

[0061] 3) Adjust the parameters on the UI interface of the host computer, send the switch control command of the power driver, output the orderly drive pulse electrical signal of +28V / 0V, and control the external noise source to turn on or off. When the external noise source is driven by 0V, it outputs cold noise; when the noise source is driven by 28V output by the spectrum analyzer, it outputs hot noise. The cold and hot noise output by the noise source is received by the spectrum analyzer and the corresponding power is recorded.

[0062] 4) The proportional factor is calculated using the ratio of thermal noise to cold noise, and the equivalent noise temperature of the spectrum analyzer itself is further derived.

[0063] 5) If Figure 5As shown in the figure, the environment of noise source test mode is built, the spectrum analyzer outputs +28V / 0V orderly driving pulse electrical signal to control the external noise source to turn on or off, the output of the external noise source is connected to the RF input port of the device under test, and the output RF (or IF) port of the device under test is connected to the RF input port of the spectrum analyzer. When the noise source is driven by 0V, it outputs cold noise; when the noise source is driven by 28V output by the spectrum analyzer, it outputs thermal noise. In the measurement state, the cold and hot noise output by the noise source are received by the spectrum analyzer to obtain the corresponding power.

[0064] 6) Use the ratio of thermal noise to cold noise to calculate the proportional factor, and further derive the equivalent noise temperature of the cascade of the DUT and the spectrum analyzer.

[0065] 7) Use the power of the measurement and calibration process to deduce the gain of the DUT, and use the noise coefficient cascade formula to deduce the equivalent noise temperature of the DUT. Finally, after transformation, the noise coefficient related results of the DUT can be characterized, including parameters such as noise figure (dB) and noise factor.

[0066] In the above embodiment, the power drive device between the host computer and the external noise source can be controlled by USB direct connection without additional equipment and hardware configuration. As a component of the Y-factor noise coefficient test system, the test system can be built in a more convenient form, without the need to use a high-end spectrum analyzer with integrated power drive function, and can be realized by connecting the host computer via USB, thereby reducing costs.

[0067] In an embodiment of the present application, a noise coefficient test system is disclosed, including a housing, a USB connection interface, a switch logic control module, a power management module and a switch circuit. The switch logic control module is used to establish a communication connection with a host computer through a USB connection interface, and respond to the switch control instruction output by the host computer to send a switch control electrical signal to the switch circuit. The power management module is used to convert the DC power supply of the USB interface of the host computer into a target level signal and then output it to the switch circuit. The switch circuit is used to respond to the switch control electrical signal to turn on or off to send a drive pulse electrical signal to an external noise source. Since the power drive device of the USB interface sends a drive pulse electrical signal to the external noise source, a spectrum analyzer that does not reserve a dedicated noise source interface can be used in a noise coefficient test system, thereby expanding the application scenario of the spectrum analyzer; different external noise sources can also be flexibly replaced to adapt to different devices under test.

[0068] The above specific examples are used to illustrate the present invention, which is only used to help understand the present application and is not intended to limit the present application. For technicians in the technical field to which the present application belongs, they can also make some simple deductions, deformations or substitutions based on the ideas of the present application.

Claims

1. A power supply driving device for an external noise source, characterized in that: It includes a housing, a USB connection interface, a switch logic control module, a power management module and a switch circuit; The USB connection interface is arranged on the housing and is used to connect to a host computer so as to serve as a connection interface for serial communication between the host computer and the power drive device; The power management module is connected between the switch circuit and the USB connection interface, and is used to output a target level signal to the switch circuit when the USB connection interface is connected to the host computer; The switch logic control module is connected between the USB connection interface and the switch circuit, and is used to establish a communication connection with the host computer through the USB connection interface; when the switch logic control module establishes a communication connection with the host computer, the switch logic control module is also used to respond to a switch control instruction output by the host computer to send a switch control electrical signal to the switch circuit; The switch circuit is used to be connected to the external noise source, and is used to respond to the switch control electrical signal to be turned on or off; when the switch circuit is turned on, the switch circuit outputs the target level signal output by the power management module to the external noise source, and otherwise stops outputting the target level signal, so as to send a driving pulse electrical signal of a preset frequency to the external noise source through the turning on and off of the switch circuit; The power management module includes a first power circuit and a second power circuit; the first power circuit is connected between the USB connection interface and the second power circuit, and when the USB connection interface is electrically connected to the host computer, the second power circuit is used to obtain the direct current signal output by the USB interface of the host computer through the USB connection interface and send a power start electrical signal to the second power circuit; The second power supply circuit is connected to the switch circuit, and the second power supply circuit is used to respond to the power start electrical signal, convert the DC signal output by the USB interface of the host computer into the target level signal, and send the target level signal to the switch circuit; The switch control electrical signal is a pulse electrical signal. When the pulse electrical signal is at a high level, the switch circuit is turned on. When the pulse electrical signal is at a low level, the switch circuit is turned off.

2. The power driving device according to claim 1, characterized in that: The switch circuit is electrically connected to the external noise source via a BNC connector provided on the housing; and the USB connection interface is a Type-B interface or a Type-C interface.

3. The power driving device according to claim 1, characterized in that: The switch logic control module includes a USB controller and an IO logic controller; the USB controller is connected to the USB connection interface, and the USB controller is used to establish a communication connection with the host computer through the USB connection interface; the USB controller is also used to forward the switch control instruction to the IO logic controller; The IO logic controller is connected to the switch circuit, and is used for converting the switch control instruction into the switch control electrical signal and then sending the switch control electrical signal to the switch circuit.

4. The power driving device according to claim 3, characterized in that: The USB controller is also used to receive the power parameter setting instruction output by the host computer through the USB connection interface, and forward the power parameter setting instruction to the IO logic controller; The IO logic controller is also connected to the second power supply circuit, and the IO logic controller is also used to output an electrical parameter setting electrical signal to the second power supply circuit in response to the power parameter setting instruction; the second power supply circuit is also used to change the voltage value of the output target level signal in response to the electrical parameter setting electrical signal.

5. The power driving device according to claim 4, characterized in that: The switch logic control module further includes a memory; the memory is used to store the power parameter setting instruction and / or the switch control instruction.

6. The power driving device according to claim 5, characterized in that: The IO logic controller is also used to output the switch control electrical signal according to the power parameter setting instruction stored in the memory.

7. The power driving device according to claim 5, characterized in that: The IO logic controller is also used to output the switch control electrical signal according to the switch control instruction stored in the memory.

8. A noise figure test system, characterized in that: It comprises the power driving device according to any one of claims 1 to 7, a host computer, a spectrum analyzer and at least one external noise source; The host computer is connected to the power drive device via a USB interface; The power driving device is connected to the external noise source via a BNC connector; The external noise source is used to be connected to the spectrum analyzer and a device under test in a time-sharing manner so as to measure the noise coefficient of the device under test by applying the Y-factor method.

9. The noise figure test system according to claim 8, characterized in that: The host computer is a PC or the spectrum analyzer.

10. The noise figure test system according to claim 8, characterized in that: The external noise source outputs different noise source signals according to the different frequencies of the driving pulse electrical signals output by the power driving device.

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