Gain amplitude and phase calibration device and method for high-precision multi-band power amplifier based on FPGA (Field Programmable Gate Array) control

Abstract

The invention discloses a high-precision multi-band power amplifier gain amplitude-phase calibration device and method based on FPGA control, and the device comprises a numerical control attenuator, a plurality of different segmented phase shifters, a radio frequency multi-way switch, a digital temperature sensing unit, an air cooling system, a power circuit, an FPGA chip, and an upper computer. The numerical control attenuator, the radio frequency multi-way switch and the sectional type phase shifter form a radio frequency calibration link, the numerical control attenuator, the sectional type phase shifter, the radio frequency multi-way switch, the digital temperature sensing unit and the air cooling system are respectively in signal connection with a control output port of the FPGA chip, and the FPGA chip is connected with an upper computer through an RS232 serial port communication circuit. The power supply circuit provides power supply requirements for all the modules, the calibrated power amplifier is connected with the output end of the sectional phase shifter, and the digital temperature sensing unit is attached to the packaging surface of the calibrated power amplifier. According to the invention, the amplitude and phase fluctuation of the power amplifier can be finely controlled within a required range while the signal integrity is ensured, and the problems of low calibration efficiency, low calibration precision and high calibration cost of a traditional calibration device are solved.

Description

Technical Field

[0001] The present invention relates to a calibration method for a calibrated power amplifier, in particular to a high-precision multi-band power amplifier gain amplitude-phase calibration device and method based on FPGA control. Background Art

[0002] In a communication system, the performance of a calibrated power amplifier has a crucial impact on communication quality. To ensure that the amplifier can work stably and efficiently, amplitude-phase calibration is an essential step. After calibration, the calibrated power amplifier has consistent gain amplitude and phase, which is convenient for power synthesis and also convenient for driving the subsequent RF circuit to operate stably and reliably. In the traditional amplifier calibration process, there are often problems such as low calibration accuracy, complex operation, low efficiency, and temperature drift.

[0003] In a radio frequency system, there are problems such as amplitude-phase inconsistency in each path of an array feeding system (including a calibrated power amplifier), low calibration efficiency and low calibration accuracy of a traditional calibration device, and difficulty in realizing remote control, which limit the performance of the radio frequency system. For example,

Moon S M, Shin D H, Lee H Y, et al. Adaptive Calibration Method in Multiport Amplifier for K-Band Payload Applications[J]. Etri Journal, 2013, 35(4): 718-721. DOI: 10.4218 / etrij.13.0212.0534.

Wu Tianjun. Research on Silicon-Based Radio Frequency Millimeter-Wave Amplitude-Phase Control Integrated Circuit[D]. Sichuan: University of Electronic Science and Technology of China, 2021.

[0004] The purpose of the present invention is to provide a high-precision multi-band power amplifier gain amplitude-phase calibration device and method based on FPGA control. This method can batch realize fine amplitude-phase calibration, and at the same time meet the requirements of remote host computer control and offline FPGA control of the gain amplitude-phase calibration process, which is flexible and adjustable, and can also eliminate the deterioration of radio frequency performance caused by temperature drift.

[0005] The technical solution for achieving the purpose of the present invention is as follows:

[0006] A high-precision multi-band power amplifier gain and phase calibration device based on FPGA control, comprising a digital control attenuator, multiple different segmented phase shifters, a radio frequency multiplexer switch, a digital temperature sensor unit, an air cooling system, a power supply circuit, an FPGA chip and a host computer. The digital control attenuator, the radio frequency multiplexer switch and the segmented phase shifters form a radio frequency calibration link. The digital control attenuator, the segmented phase shifters, the radio frequency multiplexer switch, the digital temperature sensor unit and the air cooling system are respectively connected to the control output ports of the FPGA chip by signals. The FPGA chip is connected to the host computer through an RS232 serial communication circuit. The power supply circuit provides power requirements for each module. The power amplifier to be calibrated is connected to the output end of the segmented phase shifter. The digital temperature sensor unit is attached to the surface of the package of the power amplifier to be calibrated. During calibration, the host computer writes attenuation control codes, frequency band control codes and phase shift control codes into the FPGA chip. Through parsing and processing by the FPGA chip, the radio frequency signal enters the digital control attenuator through the coaxial input end. The digital control attenuator modulates the attenuation amount according to the attenuation control code sent by the FPGA chip. The signal enters the radio frequency multiplexer switch. The output end of the radio frequency multiplexer switch is connected to the segmented phase shifter. The radio frequency multiplexer switch selects a suitable segmented phase shifter according to the frequency band control code output by the FPGA chip. The segmented phase shifter sets different phase offsets according to different phase shift control codes of the FPGA chip to accurately adjust the phase of the radio frequency signal. The adjusted signal enters the power amplifier to be calibrated.

[0007] Further, the host computer is connected to the FPGA chip through an RS232 serial communication circuit.

[0008] Further, when the digital temperature sensor unit detects that the package temperature exceeds the set threshold, the FPGA chip controls the air cooling system to dissipate heat. At the same time, according to the temperature information, attenuation control codes and phase shift control codes with corresponding temperature compensation are adopted to realize dynamic adjustment of calibration parameters.

[0009] Further, it also includes a chassis.

[0010] Further, the power supply circuit converts the 28V voltage into ±12V, 5.8V, 5V, 3.3V voltages and two-way stepless voltage regulation through a power conversion circuit.

[0011] Further, the segmented phase shifters are three different segmented phase shifters.

[0012] A high-precision multi-band power amplifier gain and phase calibration method based on the above-mentioned gain and phase calibration device, comprising:

[0013] Step 1, test the gain amplitude and phase of the power amplifier to be calibrated before calibration at different package temperatures;

[0014] Step 2: Calculate the compensation values for the gain amplitude and phase based on the gain amplitude and phase fluctuation indicators to be achieved after calibration and the gain amplitude and phase before calibration, and select the digital controlled attenuator and segmented phase shifter;

[0015] Step 3: Connect and assemble the gain amplitude and phase calibration device;

[0016] Step 4: Test the insertion loss amplitude and phase values of the RF calibration link composed of the digital controlled attenuator, RF multiplexer, and segmented phase shifter at different frequency bands and different package temperatures;

[0017] Step 5: Record the insertion loss amplitude and phase values tested in Step 4 into the host computer, calculate the corresponding calibration amounts, and compile the corresponding attenuation control codes, frequency band control codes, and phase shift control codes according to the calibration amounts;

[0018] Step 6: The host computer writes the attenuation control code, frequency band control code, and phase shift control code into the FPGA chip to control the operation of the digital controlled attenuator, RF multiplexer, and segmented phase shifter;

[0019] Step 7: Test the gain amplitude and phase of the amplitude and phase calibration device to verify whether the gain amplitude and phase fluctuation indicators are achieved. If achieved, the calibration is completed; otherwise, fine-tune the attenuation control code and phase shift control code, and repeat this step until the calibration is completed.

[0020] Furthermore, the selection of the digital controlled attenuator should cover the gain amplitude fluctuation range of the power amplifier to be calibrated, and the selection of the segmented phase shifter should cover the phase fluctuation range of the power amplifier to be calibrated. All selections retain a 1.2-fold margin of the indicators.

[0021] Compared with the prior art, the significant advantages of the present invention are:

[0022] (1) The method of the present invention uses host computer communication, which is convenient for realizing the visualization of calibration data. It can not only perform remote calibration but also batch amplitude and phase calibration.

[0023] (2) The method of the present invention is a digital control calibration technology. The segmented phase shifter, digital controlled attenuator, and RF multiplexer can all be flexibly controlled by the control codes output by the host computer, with controllable precision and step, and the control amounts can be calculated, which is superior to the analog calibration technology;

[0024] (3) The method of the present invention fully considers the adverse effects of the temperature drift of the power amplifier to be calibrated on calibration. The calibration amounts change according to temperature changes to offset the calibration errors caused by temperature;

[0025] (4) Modular design facilitates maintenance and upgrade. Each functional module of the calibration system is designed relatively independently, which is convenient for equipment maintenance and upgrade. When a certain module fails, it can be quickly located and the corresponding module can be replaced, reducing the maintenance cost. At the same time, it is also convenient to expand and upgrade the calibration function according to technological development and actual needs. Description of the Drawings

[0026] Figure 1 It is a flow chart of a gain amplitude-phase calibration method for a high-precision multi-frequency power amplifier to be calibrated based on host computer control.

[0027] Figure 2 It is a functional block diagram of a gain amplitude-phase calibration system for a high-precision multi-frequency power amplifier to be calibrated based on host computer control.

[0028] Figure 3 It is a control block diagram of a gain amplitude-phase calibration system for a high-precision multi-frequency power amplifier to be calibrated based on host computer control.

[0029] Figure 4 It is an assembly drawing of modules of a gain amplitude-phase calibration system for a high-precision multi-frequency power amplifier to be calibrated based on host computer control. Detailed Implementation Manner

[0030] The present invention will be further described below through embodiments, but is not limited to the following embodiments.

[0031] Embodiment 1

[0032] Aiming at the characteristics that the initial gain amplitude and phase of the power amplifier do not meet the flatness and balance, it is necessary to calibrate the power amplifier within the allowable range of amplitude-phase fluctuation to achieve more efficient operation. The present invention provides a high-precision multi-band power amplifier gain amplitude-phase calibration method based on FPGA control, including the steps:

[0033] The calibration process is as Figure 1As shown in the figure, first, based on the digital temperature sensing unit, the gain amplitude and phase of the power amplifier to be calibrated before calibration are tested at different temperatures (specifically, the temperature dissipated from the power amplifier to the package surface due to its operation). Then, according to the requirements of the measured gain amplitude and phase fluctuation indexes, the compensation value is estimated. Next, a hardware calibration system is constructed based on the compensation value to implement the calibration process. Then, the insertion loss amplitude and phase of the RF calibration link are tested. Note that the RF calibration link does not include the power amplifier. Then, the calibration control code is calculated based on the gain compensation value of the power amplifier to be calibrated and the insertion loss compensation value of the RF calibration link. The calibration control code consists of an attenuation control code, a frequency band control code, and a phase shift control code. The calibration control code of the host computer is transmitted to the FPGA through the RS232 serial communication circuit. The FPGA controls the digital controlled attenuator, the segmented phase shifter, and the RF multiplexer to perform fine amplitude and phase calibration. Test whether the gain fluctuation meets the indexes. If not, fine-tune the control code until the indexes are met, and the calibration process is completed.

[0034] The specific implementation process is as follows:

[0035] First, the gain amplitude and phase of the power amplifier to be calibrated before calibration are tested at different package temperatures. Before calibration, it is necessary to obtain the initial performance of the power amplifier under different temperature conditions. The high-precision digital temperature sensing unit is closely attached to the package surface of the power amplifier to be calibrated because the power amplifier generates heat during operation, and through heat conduction, the sensor can collect the changes in the package temperature in real time. As the power amplifier continues to operate, the temperature gradually rises or fluctuates due to environmental factors, and the sensor will collect a series of different temperature values. At each collected temperature point, the gain amplitude and phase of the power amplifier to be calibrated are accurately measured using RF test equipment such as a vector network analyzer and a power meter. These test data will serve as the basis for subsequent calibration calculations. To ensure that the power amplifier operates within a safe temperature range, a reasonable temperature threshold is set. When the digital temperature sensing unit detects that the package temperature exceeds this threshold, the air-cooling system will start the fan for heat dissipation and use PWM (Pulse Width Modulation) technology to adaptively adjust the fan speed according to the temperature. The higher the temperature, the larger the duty cycle of the PWM modulation signal, and the faster the fan speed, so as to balance energy conservation and efficient heat dissipation and ensure the stable performance of the power amplifier.

[0036] Then, according to the gain amplitude and phase indicators to be achieved after calibration and the gain amplitude and phase before calibration, calculate the compensation values for the gain amplitude and phase, and conduct module selection and design; according to specific application requirements, clarify the precise gain amplitude and phase indicators that the power amplifier needs to achieve after calibration. Compare and analyze these target indicators with the gain amplitude and phase data at different temperatures before calibration. Through calculation, obtain the values that need to be compensated for the gain amplitude and phase at each temperature point. These compensation values are the key parameters for achieving high-precision calibration. When conducting module selection and design, multiple key factors need to be comprehensively considered. Among them, for the operating frequency, the performance requirements for the module are different in different frequency bands, and a module that can operate stably within the target frequency band needs to be selected. The operating voltage must match the power supply voltage of the system to ensure the normal operation of the module. At the same time, the power-bearing capacity of the module should meet the output requirements of the power amplifier to avoid damage to the module due to power overload. For the selection of the digital controlled attenuator, it is necessary to ensure that it can cover the gain amplitude fluctuation range of the power amplifier to be calibrated under different temperatures and operating conditions. Considering the uncertainties in actual applications, to ensure the reliability of calibration, a 1.2-fold indicator margin should be reserved during selection. Similarly, for the selection of the segmented phase shifter, it should be able to cover the phase fluctuation range of the power amplifier and also reserve a 1.2-fold margin. This can ensure that in various situations, the gain and phase of the power amplifier can be effectively adjusted through the digital controlled attenuator and the segmented phase shifter.

[0037] Continue to construct a fully functional and precise amplitude-phase calibration device to implement the calibration function and control the calibration process, such as Figure 2 , Figure 3 and Figure 4 shown. The system structure mainly consists of a digital controlled attenuator 1, a segmented phase shifter 2, a radio frequency multiplexer 3, a digital temperature sensor unit 4, the power amplifier to be calibrated 5, the air-cooling system inlet 7-1 and the air-cooling system outlet 7-2, a power supply circuit 8, an FPGA 10-1, and an RS232 serial communication circuit 11. The radio frequency signal input port is sequentially connected to the digital controlled attenuator, the radio frequency multiplexer, the segmented phase shifter, and the power amplifier to be calibrated; the digital controlled attenuator, the segmented phase shifter, the radio frequency multiplexer, the digital temperature sensor unit, and the air-cooling system are respectively connected to different control output ports of the FPGA; the FPGA is connected to the upper computer through the RS232 serial communication circuit; the power supply circuit maintains a power supply connection according to the power requirements of each module.

[0038] Fix the chassis 12 of the amplitude-phase calibration system by using the screw hole 13. The radio frequency signal passes through each module in a specific order: First, turn on the main switch 9, and the radio frequency signal enters the digital controlled attenuator 1 through the coaxial input terminal 6-2. The digital controlled attenuator 1 can modulate the attenuation amount according to the attenuation control code sent by the FPGA 10-1. Next, in order to meet the requirements of wide-band use, a segmented phase shifter 2 is used for phase adjustment: The signal first enters the radio frequency multiplexer 3. The radio frequency multiplexer 3 selects a suitable path from multiple preset signal paths according to the frequency band control code output by the FPGA 10-1 to meet the signal transmission requirements of different frequency bands. The segmented phase shifter 2 is connected behind the radio frequency multiplexer 3. The segmented phase shifter can set different phase offsets according to different phase shift control codes given by the FPGA 10-1 to accurately adjust the phase of the radio frequency signal. The signal after the above processing enters the power amplifier 5 to be calibrated. The power amplifier 5 to be calibrated amplifies the radio frequency signal, and finally forms a high-power microwave that meets the application requirements and is output through the coaxial output terminal 6-1. The power supply circuit 8 stably converts the input 28V power supply into multiple fixed-value voltages such as ±12V, 5.8V, 5V, 3.3V and two-way stepless voltage regulation through an efficient power conversion circuit, and provides a suitable working power supply for each module in the system to ensure the stable operation of the entire system. In addition, the digital temperature sensor unit 4 can not only measure the working temperature of the power amplifier in real time, but also perform intelligent temperature control in combination with the FPGA 10-1. When the detected temperature exceeds the preset threshold, the FPGA 10-1 will immediately start the air-cooling system. The FPGA 10-1 selects the attenuation control code and phase shift control code for temperature compensation corresponding to the received temperature information from the pre-stored data to realize the dynamic adjustment of the calibration parameters. The entire system is controlled by the FPGA. The upper computer records the pre-calibration values and data processing, and transmits the calibration information to the FPGA through the RS232 serial communication circuit. The FPGA outputs the attenuation control code, frequency band control code and phase shift control code.

[0039] Next, test the insertion loss amplitude and phase values of the RF calibration link composed of the digital control attenuator 1, RF multiplexer switch 3, and segmented phase shifter 2 under different frequency bands and different package temperatures; after building the calibration system, it is necessary to test the performance of the RF calibration link composed of the digital control attenuator 1, RF multiplexer switch 3, and segmented phase shifter 2. Since the calibration link will introduce insertion loss during signal transmission, that is, the amplitude of the signal will be attenuated and the phase will also change, and these insertion losses will directly affect the final accuracy of power amplifier calibration. Therefore, under different frequency bands and different package temperature conditions, it is necessary to measure the insertion loss amplitude and phase values of the calibration link. At each combination of frequency band and temperature point, multiple measurements are taken and averaged to improve the accuracy of the test data. Through a large amount of test data, the insertion loss characteristics of the calibration link under various working conditions are obtained. At the same time, to eliminate the influence of the calibration link insertion loss on the power amplifier calibration accuracy, the method of adjusting the attenuation control code is used for compensation. According to the measured insertion loss amplitude value, calculate the attenuation amount that needs to be increased or decreased, and adjust the attenuation control code of the digital control attenuator 1 through FPGA10-1, so that the signal amplitude and phase after passing through the calibration link are as close as possible to the ideal state, thereby improving the accuracy of power amplifier calibration.

[0040] Record the compensation values of the gain amplitude and phase, the insertion loss amplitude and phase values of the RF calibration link under different frequency bands and different package temperatures into the host computer, and calculate the corresponding calibration amounts. Compile the corresponding attenuation control codes, frequency band control codes, and phase shift control codes according to the calibration amounts; record all the compensation values of the gain amplitude and phase calculated under different frequency bands and different package temperatures, and the insertion loss amplitude and phase values of the tested RF calibration link into the host computer. The host computer uses these data and combines precise calibration algorithms to calculate the calibration amounts required for the power amplifier under various frequency band and temperature conditions. The division of the frequency band is determined according to the working range of the segmented phase shifter 2. Since the working frequency band of a single segmented phase shifter is relatively narrow and cannot cover the entire target frequency band. Therefore, the method of time-division gating of multiple different segmented phase shifters is used to achieve the broadening of the working frequency band. Under different frequency bands, according to the requirements of the calibration amount, select the appropriate segmented phase shifter to work, and output the corresponding frequency band control code through FPGA10-1 to achieve switching. According to the calculated calibration amount, combined with the usage instructions of the digital control attenuator 1, RF multiplexer switch 3, and segmented phase shifter 2, compile the corresponding attenuation control codes, frequency band control codes, and phase shift control codes. Under different package temperatures, there is a one-to-one correspondence between the gain amplitude, phase calibration amount and the attenuation control code, frequency band control code, and phase shift control code.

[0041] The host computer writes the attenuation control code, frequency band control code, and phase shift control code into FPGA10-1 on the FPGA control circuit 10 through the RS232 serial communication circuit 11 to control the operation of the digital control attenuator 1, RF multiplexer 3, and segmented phase shifter 2. As one of the control cores of the system, the host computer has powerful data processing and interaction functions. Through the RS232 serial communication instruction, the host computer sends the compiled attenuation control code, frequency band control code, and phase shift control code to FPGA10-1. After receiving these control codes, FPGA10-1 quickly parses and processes them. According to the attenuation control code, FPGA10-1 can accurately control the attenuation value of the digital control attenuator 1 to achieve precise adjustment of the amplitude of the RF signal. Based on the frequency band control code, FPGA10-1 controls the RF multiplexer 3 to select the appropriate signal path to ensure that the signal can be correctly transmitted at different frequency bands. At the same time, according to the phase shift control code, FPGA10-1 controls the phase shift of the segmented phase shifter 2 to precisely adjust the phase of the RF signal. In this way, precise control of the entire calibration system is achieved, enabling the power amplifier to achieve the best gain amplitude-phase performance under different working conditions. The host computer can not only write a large amount of calibration data at one time but also has high-efficient data processing capabilities. It can flexibly and timely correct the calibration values according to the actual situation to cope with various complex working environments and demand changes.

[0042] After completing the above calibration operations, a test platform is built using a vector network analyzer, attenuator, absorption load, etc. to comprehensively test the gain amplitude and phase of the fine amplitude-phase calibration device. The test results are compared with the pre-set gain amplitude and phase indicators to verify whether the calibration system has achieved the expected calibration target. If the test results show that both the gain amplitude and phase have reached the set indicators, it indicates that the calibration work has been successfully completed. However, if the test results do not meet the indicator requirements, the system will enter the fine-tuning stage. The host computer fine-tunes the attenuation control code and phase shift control code to further optimize the calibration parameters. Then, the gain amplitude and phase are tested again and compared with the indicators. This process is repeated until the test results meet the gain amplitude and phase indicators. During the entire calibration process, the gain amplitude and phase calibration amounts at different package temperatures are accurately calculated, and through the temperature compensator, the influence of temperature on the accuracy is fully compensated, enabling high-precision calibration indicators to be met. In addition, to avoid the influence of other uncertain factors (such as small changes in the test environment, inherent errors of the equipment, etc.) on the calibration accuracy, the host computer can also flexibly fine-tune the calibration amount to ensure the accuracy and reliability of the calibration results. In this way, batch gain amplitude-phase calibration of the power amplifier can be carried out, while ensuring the completion of a high-precision calibration process and avoiding the high cost of the negative feedback real-time calibration system.

[0043] While ensuring signal integrity, the present invention can finely control the amplitude and phase fluctuations of the power amplifier within the required range, solving the problems of low calibration efficiency, low calibration accuracy, and high calibration cost of traditional calibration devices.

[0044] The above content is a further detailed description of the present invention in combination with specific / preferred embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several alternatives or modifications can be made to these described embodiments, and these alternative or modified forms should all be regarded as belonging to the protection scope of the present invention.

Claims

1. A high-precision multi-band power amplifier gain and phase calibration device based on FPGA control, characterized in that It includes a numerically controlled attenuator, multiple different segmented phase shifters, a radio frequency multiplexer switch, a digital temperature sensor unit, an air cooling system, a power supply circuit, an FPGA chip, and a host computer. The numerically controlled attenuator, the radio frequency multiplexer switch, and the segmented phase shifters form a radio frequency calibration link. The numerically controlled attenuator, the segmented phase shifters, the radio frequency multiplexer switch, the digital temperature sensor unit, and the air cooling system are respectively connected to the control output ports of the FPGA chip by signals. The FPGA chip is connected to the host computer through an RS232 serial communication circuit. The power supply circuit provides power requirements for each module. The power amplifier to be calibrated is connected to the output end of the segmented phase shifter. The digital temperature sensor unit is attached to the surface of the package of the power amplifier to be calibrated. During calibration, the host computer writes attenuation control codes, frequency band control codes, and phase shift control codes into the FPGA chip. Through parsing and processing by the FPGA chip, the radio frequency signal enters the numerically controlled attenuator through the coaxial input end. The numerically controlled attenuator modulates the attenuation amount according to the attenuation control code sent by the FPGA chip. The signal enters the radio frequency multiplexer switch. The output end of the radio frequency multiplexer switch is connected to the segmented phase shifter. The radio frequency multiplexer switch selects a suitable segmented phase shifter according to the frequency band control code output by the FPGA chip. The segmented phase shifter sets different phase offsets according to different phase shift control codes of the FPGA chip, and precisely adjusts the phase of the radio frequency signal. The adjusted signal enters the power amplifier to be calibrated.

2. The high-precision multi-band power amplifier gain and phase calibration device according to claim 1, wherein The host computer is connected to the FPGA chip through an RS232 serial communication circuit.

3. The high-precision multi-band power amplifier gain and phase calibration device according to claim 1, characterized in that, When the digital temperature sensor unit detects that the package temperature exceeds the set threshold, the FPGA chip controls the air cooling system to dissipate heat. At the same time, according to the temperature information, attenuation control codes and phase shift control codes with corresponding temperature compensation are adopted to realize dynamic adjustment of the calibration parameters.

4. The high-precision multi-band power amplifier gain and phase calibration device according to claim 1, characterized in that, It also includes a chassis.

5. The high-precision multi-band power amplifier gain and phase calibration device according to claim 1, characterized in that, The power supply circuit converts the 28V voltage into ±12V, 5.8V, 5V, 3.3V voltages and two-way stepless voltage regulation through a power conversion circuit.

6. The high-precision multi-band power amplifier gain and phase calibration device according to claim 1, characterized in that The segmented phase shifter is three different segmented phase shifters.

7. A high-precision multi-band power amplifier gain and phase calibration method based on the gain and phase calibration device according to any one of claims 1-6, characterized in that, It includes: Step 1, test the gain amplitude and phase of the power amplifier to be calibrated before calibration at different package temperatures. Step 2, calculate the compensation values of the gain amplitude and phase according to the gain amplitude and phase fluctuation indexes to be achieved after calibration and the gain amplitude and phase before calibration, and select the numerically controlled attenuator and the segmented phase shifter. Step 3, connect and assemble the gain amplitude and phase calibration device. Step 4, test the insertion loss amplitude and phase values of the radio frequency calibration link composed of the numerically controlled attenuator, the radio frequency multiplexer switch, and the segmented phase shifters at different frequency bands and different package temperatures. Step 5, record the insertion loss amplitude and phase values tested in Step 4 into the host computer, calculate the corresponding calibration amounts, and compile the corresponding attenuation control codes, frequency band control codes, and phase shift control codes according to the calibration amounts. Step 6, the host computer writes the attenuation control codes, frequency band control codes, and phase shift control codes into the FPGA chip to control the operation of the numerically controlled attenuator, the radio frequency multiplexer switch, and the segmented phase shifter. Step 7: Test the gain amplitude and phase of the amplitude-phase calibration device, and verify whether the gain amplitude and phase fluctuation indicators are met. If they are met, the calibration is completed; otherwise, fine-tune the attenuation control code and phase shift control code, and repeat this step until the calibration is completed.

8. The high-precision multi-band power amplifier gain and phase calibration method of the gain and phase calibration device according to claim 7, characterized in that The selection of the digital controlled attenuator should cover the gain amplitude fluctuation range of the power amplifier to be calibrated, and the selection of the segmented phase shifter should cover the phase fluctuation range of the power amplifier to be calibrated. All selections should retain an index margin of 1.2 times.

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