Device, method and equipment for automatically adjusting quiescent operating point of power amplifier and medium

Abstract

In order to solve the problems of low comprehensive efficiency, insufficient linearity and insufficient stability of automatic adjustment of a quiescent operating point of a power amplifier in the prior art, the invention provides an automatic adjustment device and method for the quiescent operating point of the power amplifier, equipment and a medium. The device comprises a power amplification module, an upper computer control module, a micro-control module, a temperature detection module, a current detection module, a digital-to-analog conversion module and an EVM (Error Vector Magnitude) test module, according to the method, through a software program of the upper computer control module and the micro-control module, the quiescent working point of the power amplifier is controlled and automatically adjusted according to temperature data, current data and an EVM value. According to the device and the method, the influence of the temperature data, the current data and the change of the EVM value on the working state of the power amplifier is comprehensively considered, and particularly, the performance and the stability of the power amplifier are improved by automatically testing and optimizing the EVM value.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technology, and in particular to a device, method, equipment and medium for automatically adjusting a static operating point of a power amplifier. Background Art

[0002] In modern wireless communication systems, the performance of the radio frequency power amplifier (RFPA, hereinafter referred to as the power amplifier) ​​as a key component directly affects the efficiency and quality of the entire communication link. With the development of technology, the requirements for the efficiency, linearity and stability of the power amplifier are increasing. In practical applications, the static operating point of the power amplifier plays a vital role in its performance. A stable and optimized static operating point can effectively improve the efficiency of the power amplifier, reduce energy consumption, and improve the quality of the signal.

[0003] Traditionally, the static operating point of a power amplifier is usually fixed. At present, the gate voltage adjustment circuit of the mainstream power amplifier is to test the gate voltage current in real time through an external device, such as a multimeter, and then manually adjust the voltage through a digital-to-analog converter (DAC) circuit or a sliding rheostat to change the static current. Therefore, it is difficult to dynamically adjust the static operating point according to the changes in actual working conditions. In addition, under different input signal power, temperature and load conditions, the performance of the power amplifier will be significantly affected. When the static operating point of the power amplifier is adjusted by external resistance adjustment, the problem of static current changes in the power amplifier under high and low temperature conditions cannot be solved. Temperature changes will cause device parameter drift, fluctuations in input signal power will affect the linearity of the amplifier, and changes in load may cause distortion of the output signal. These factors make it difficult for power amplifiers with fixed static operating points to maintain optimal performance in complex and changing working environments.

[0004] In order to meet these challenges, some improvement schemes have been proposed in the prior art. For example, the temperature of the power amplifier is monitored by a temperature sensor, and the temperature information is fed back to the control circuit, and the gate voltage is adjusted to compensate for the impact of temperature changes. However, this method mainly focuses on temperature compensation and is not adaptable enough to input signal power and load changes. Another technical solution detects the power of the input signal and adjusts the power supply voltage of the power amplifier according to the input power to achieve partial optimization of the static operating point, but the comprehensive consideration of temperature and load changes is still insufficient.

[0005] In addition, some technical solutions attempt to use complex feedback control systems to simultaneously consider the impact of temperature, input signal power, and load changes on the performance of the power amplifier to achieve dynamic adjustment of the static operating point. However, these solutions often require a large number of sensors and complex control algorithms, which not only increase the complexity and cost of the system, but may also introduce additional delays and stability issues.

[0006] On the other hand, Error Vector Magnitude (EVM) is the key to evaluating signal quality. It is used to quantify the deviation between the actual received signal of the power amplifier and the ideal reference signal. As an important indicator to measure the performance of the power amplifier, it reflects the degree of distortion of the output signal. Automatic testing and optimization of EVM is essential to ensure the reliability and effectiveness of communication systems. However, most of the existing EVM testing and optimization methods are independent of the static operating point adjustment of the power amplifier, and lack an efficient method that can combine EVM testing with static operating point adjustment.

[0007] In summary, the prior art still has deficiencies in the automatic adjustment of the static operating point of the power amplifier and the optimization of EVM, and lacks an efficient solution that can comprehensively consider temperature, input signal power and load changes and combine EVM testing with optimization. Therefore, developing a device and method for automatically adjusting the static operating point of a power amplifier based on EVM automatic test optimization has important practical significance for improving the performance and adaptability of the power amplifier. Summary of the invention

[0008] In view of this, in order to solve the problems of low overall efficiency of automatic adjustment of the static operating point of the power amplifier in the prior art, as well as insufficient linearity and stability under the premise of cost considerations, the present invention provides a device, method, equipment and medium for automatic adjustment of the static operating point of the power amplifier, which comprehensively considers the influence of changes in temperature data, current load and EVM value on the working state of the power amplifier, and especially realizes the improvement of the performance and stability of the power amplifier through automatic testing and optimization of the EVM value.

[0009] The present invention provides a device for automatically adjusting the static operating point of a power amplifier, the device at least comprising a power amplifier module, a host computer control module, a microcontroller module, a temperature detection module, a current detection module, a digital-to-analog conversion module and an error vector amplitude test module; an external signal source is connected to the host computer control module and the power amplifier module; The power amplification module is used to receive the signal sent by the signal source as an input signal through the adapted connection cable and the communication interface, and output the signal after power amplification; the power amplification module at least includes an input port, a power amplifier and an output port; The host computer control module is used to issue instructions to control the signal source to generate signals; through interaction with the microcontroller module, it issues operating instructions to other modules in the device, implements monitoring and performs remote control, including: setting and sending temperature thresholds, current thresholds, error vector amplitude thresholds and signal source parameters, viewing and obtaining operating status data of the temperature detection module, the current detection module and the power amplifier module, and storing, analyzing, optimizing and displaying the operating status data through a matching software program; using a matching software program to analyze the error vector amplitude value obtained from the error vector amplitude test module, and feeding back the analysis results to the microcontroller module to achieve automatic adjustment of the static operating point of the power amplifier; The microcontrol module is used to realize decision control of the temperature detection module, the current detection module and the digital-to-analog conversion module by receiving control instructions and data from the host computer control module; collect, preprocess, calculate, store and output signals through interaction with the temperature detection module, the current detection module and the digital-to-analog conversion module, wherein the signals include temperature data obtained from the temperature detection module, voltage signals obtained from the current detection module, and digital signals transmitted to the digital-to-analog conversion module; The temperature detection module is used to detect and monitor temperature data in real time and transmit the temperature data to the microcontroller module for recording, analysis and storage; The current detection module is used to monitor the current signal of the signal output state of the power amplifier module, and feed back the current signal to the micro-control module to obtain the current data of the power amplifier; the current detection module at least includes a current detection amplifier and a sampling resistor; the current detection amplifier is connected to the two ends of the sampling resistor, and is used to amplify the current signal on the sampling resistor, and after converting the amplified current signal into a voltage signal, transmit it to the micro-control module to generate the current data of the power amplifier; the sampling resistor is connected to the digital-to-analog conversion module to obtain the signal of the decision instruction made by the micro-control module on controlling the power amplifier module, and after sampling, it is input into the power amplifier module to adjust the static working point of the power amplifier therein; The digital-to-analog conversion module is used to convert the digital signal output by the microcontroller module into an analog signal through circuit design, and then input the analog signal into the sampling resistor in the current detection module to adjust the static operating point of the power amplifier. The error vector amplitude test module is used to measure and calculate the error vector amplitude value of the output signal by comparing the output signal of the power amplifier module with the generated signal as a reference signal, and send the error vector amplitude value to the upper computer control module through an adapted communication interface for data analysis and processing.

[0010] Specifically, the micro-control module at least includes a micro-control unit and an analog-to-digital converter.

[0011] Furthermore, the signal generated by the signal source is a standard OFDM modulated signal; the signal source has a signal preprocessing capability by providing a signal amplifier, a bandpass filter and a signal modulation device, and is used to modulate the generated signal into an analog signal matching the power amplifier.

[0012] Specifically, the host computer control module uses a matching software program to analyze the error vector amplitude value obtained from the error vector amplitude test module, including using the matching software program to obtain the minimum error vector amplitude value within a set test cycle, and simultaneously recording and storing the static operating point of the power amplifier corresponding to the minimum error vector amplitude value.

[0013] Preferably, the host computer control module includes a PC host computer and a switch, the PC host computer and the switch transmit signals via a network cable, and the switch transmits signals to the STM32F105 via an Ethernet communication interface RJ45 and a network communication protocol TCP / IP; The microcontroller unit adopts STM32F105, and the STM32F105 itself integrates an analog-to-digital converter; The temperature detection module adopts a temperature sensor DS18B20, and the temperature sensor DS18B20 adopts a single bus interface to connect with the STM32F105; The current detection module adopts the current detection amplifier INA199; The digital-to-analog conversion module directly adopts the digital-to-analog converter chip MCP4725A0T, and the signal transmission between the STM32F105 and the digital-to-analog converter chip MCP4725A0T is performed through the I2C network communication protocol; The error vector amplitude test module adopts a spectrum analyzer to measure the error vector amplitude value. The spectrum analyzer is connected to the output port of the power amplifier module through a radio frequency coaxial cable.

[0014] On the other hand, the present invention provides a method for automatically adjusting the static operating point of a power amplifier, which uses the aforementioned device to automatically adjust the static operating point of the power amplifier, and the method includes: Step 110: Use the host computer control module to send an initialization instruction to the microcontrol module, start the initialization operation of the microcontrol module and the temperature control module, and send the response information of the initialization operation back to the host computer control module for confirmation; use the host computer control module to set parameters, and the parameters at least include temperature threshold, current threshold, error vector amplitude threshold and signal source parameters; the signal source generates a signal according to the instruction sent by the host computer control module, and sends an analog signal to the power amplifier module after preprocessing the generated signal, and sends the generated signal back to the host computer control module for recording and storage; Step 120: After the analog signal received by the power amplifier module is amplified by the power amplifier, the signal is output through the output port; on the one hand, the output signal is sent to the error vector amplitude test module to detect the signal quality by calculating the error vector amplitude value, and the error vector amplitude value is transmitted back to the upper computer control module; on the other hand, the current detection amplifier in the current detection module completes the current monitoring of the power amplifier to obtain the current data, and transmits the current data to the micro control module. If the current data deviates from the normal range defined by the current threshold, the micro control module sends an alarm signal to the upper computer control module and starts the circuit protection mechanism; Step 130: Use the temperature detection module to regularly measure the temperature data of the environment in which the device is located, and send the temperature data to the microcontroller module for recording and storage. If the temperature data deviates from the normal range defined by the temperature threshold, the microcontroller module sends an alarm signal to the upper computer control module and starts the temperature protection mechanism; Step 140: The temperature data and current data acquired by the microcontroller module are transmitted to the host computer control module; the host computer control module processes and analyzes the temperature data, current data, error vector amplitude value and generated signal according to the set temperature threshold, current threshold, error vector amplitude threshold and signal source parameter, issues a control instruction to the microcontroller module according to the result data of the processing and analysis, and transmits the result data, parameters and control instruction to the microcontroller module; Step 150: Utilize the microcontroller unit in the microcontroller module to extract the parameters and control instructions, and make decisions and judgments based on the extracted contents; utilize the digital-to-analog conversion module to convert the control information of the decision and judgment from digital signals into analog signals, and control and adjust the gate voltage of the power amplifier in the power amplifier module through the sampling resistor in the current detection module, so as to complete the automatic adjustment of the static operating point of the power amplifier based on the temperature data, the current data and the error vector amplitude value; Step 160: In the set test cycle By setting time intervals, multiple rounds of temperature data measurement, current data monitoring, error vector amplitude value testing and corresponding static operating point adjustment are performed, and the results of each time are recorded and stored; the error vector amplitude values ​​obtained in multiple rounds are recorded and analyzed by the software program of the host computer control module to find the minimum error vector amplitude value, and the static operating current value corresponding to the power amplifier is adjusted according to the error vector amplitude value as the optimal static operating point of the power amplifier; the optimal static operating point and the corresponding temperature data are written into the microcontroller module for recording and storage, and are used to maintain the optimal working state of the power amplifier by automatically adjusting the output of the digital-to-analog conversion module in subsequent operation.

[0015] Preferably, by defining an automatic test sequence of signals generated by multiple signal sources in the upper computer control module, the optimal static operating point of the power amplifier is obtained for the generated signals of different frequency and power conditions in the automatic test sequence, and recorded and stored; using the stored optimal static operating point, any generated signal within the range of the automatic test sequence is preprocessed and used as the input signal of the power amplifier to automatically adjust the optimal static operating point of the power amplifier; the signal source has a frequency range of 100MHz to 1GHz and a power range of Generate automatic test sequences in the design space from dBm to 25dBm with a frequency step of 100MHz and a power step of 5dBm.

[0016] Furthermore, the host computer control module is used to design a display interface, and the temperature data, current data, error vector amplitude value and real-time information and historical information of the generated signal regularly fed back by the microcontroller module are displayed and called in the form of a chart or data interface feedback; A mechanism for limited confirmation of signal reception and limited failure retransmission is added between the host computer control module and the signal source, the error vector amplitude test module and the microcontroller module, and between the microcontroller module and the temperature detection module, the current detection module and the digital-to-analog conversion module to reduce signal transmission errors.

[0017] In addition, the present invention protects a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the aforementioned method for automatically adjusting the static operating point of a power amplifier when executing the computer program.

[0018] The present invention also protects a storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps of the above-mentioned method for automatically adjusting the static operating point of a power amplifier are implemented.

[0019] In summary, the present invention provides a device, method, apparatus and medium for automatically adjusting the static operating point of a power amplifier. Compared with the prior art, the device and method of the present invention mainly achieve the following improvements and significant effects: 1) By combining the power amplifier, the temperature detection module and the EVM test module, not only the real-time monitoring of the temperature data is realized, but also the static operating point of the power amplifier can be automatically adjusted by combining the signal quality index reflected by the EVM value using the device and method designed by the present invention, which greatly improves the working efficiency, linearity and stability of the power amplifier.

[0020] 2) The process of using the EVM test module to perform EVM testing is to directly connect the EVM test device such as a spectrum analyzer with the host computer control module. It is easy to achieve automatic and flexible test settings and data analysis and optimization through software programs, which improves the intelligence level of the device and the reliability and stability of the system where the power amplifier is located.

[0021] 3) By using integrated chips in multiple functional modules, such as microcontroller chips and DAC chips, system integration and automation are easier to achieve. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A structural framework diagram of a device for automatically adjusting the static operating point of a power amplifier provided by the first embodiment of the present invention; Figure 2 A structural hardware framework diagram of a power amplifier static operating point automatic adjustment device provided by the second embodiment of the present invention, wherein a PC host computer and a switch constitute a host computer control module, MCU is a microcontroller unit in a microcontroller module, STM32F105 is an MCU model, ADC is an analog-to-digital converter provided by the MCU of this model, DS18B20 is a temperature sensor model, MCP4725A0T is a DAC chip model, DAC is a digital-to-analog converter, 1-WIRE is a single bus interface mode adopted by DS18B20, I2C is a network communication protocol between STM32F105 and DAC chip MCP4725A0T, and RJ45 is an Ethernet communication interface model; Figure 3 The present invention provides a flowchart of a method for automatically adjusting the static operating point of a power amplifier according to the third embodiment of the present invention. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] In the first embodiment, referring to Figure 1 As shown, the present invention proposes an automatic adjustment device for the static operating point of a power amplifier, the device at least includes a power amplifier module, a host computer control module, a microcontroller module, a temperature detection module, a current detection module, a digital-to-analog conversion module and an error vector magnitude (EVM) test module, the host computer control module is bidirectionally connected to the microcontroller module and the EVM test module through an adapted communication interface and a network communication protocol, the host computer control module is directly bidirectionally connected to an external signal source, the signal source is unidirectionally connected to the power amplifier module, the microcontroller module is also directly bidirectionally connected to the temperature test module, the microcontroller module is unidirectionally connected to the digital-to-analog conversion module, the digital-to-analog conversion module is unidirectionally connected to the current detection module, the current detection module is unidirectionally connected to the microcontroller module, the current detection module is bidirectionally connected to the power amplifier module through a circuit, and the power amplifier module is unidirectionally connected to the EVM test module; Figure 1 The arrows of the connecting lines between the modules shown indicate the direction of signal or data transmission. A bidirectional connection indicates bidirectional transmission of signals or data between modules, and a unidirectional connection indicates unidirectional transmission of signals or data between modules in the direction of the arrows.

[0025] The power amplification module is used to receive a signal sent by a signal source as an input signal through an adapted connection cable and a communication interface, and output a signal after power amplifying the input signal; the power amplification module at least includes an input port, a power amplifier and an output port.

[0026] The host computer control module is used to issue instructions to control the signal source to generate signals; through interaction with the microcontroller module, it issues operating instructions, monitors and remotely controls other modules in the device, including: setting and sending temperature thresholds, current thresholds, EVM threshold parameters and signal source parameters, checking and obtaining operating status data of the temperature detection module, current detection module and power amplifier module, and storing, analyzing, optimizing and displaying the operating status data through a matching software program; using a matching software program to analyze the EVM value obtained from the EVM test module, and feeding back the analysis results to the microcontroller module to achieve automatic adjustment of the static operating point of the power amplifier.

[0027] The microcontrol module is used to realize decision-making control of other modules by receiving control instructions and data from the upper computer control module; collect, preprocess, calculate, store and output signals through interaction with the temperature detection module, the current detection module and the digital-to-analog conversion module, wherein the signals include temperature data obtained from the temperature detection module, the voltage signal obtained from the current detection module, and the digital signal transmitted to the digital-to-analog conversion module; make decisions and execute startup temperature compensation, temperature alarm and overheating protection according to the temperature data; understand the working state of the power amplifier according to the voltage signal to prevent overcurrent or short circuit from damaging the power amplifier, and realize automatic adjustment of the static working point of the power amplifier by adjusting the gate voltage of the power amplifier through the digital-to-analog conversion module; the microcontrol module at least includes a microcontroller unit (MCU) and an analog-to-digital converter (ADC).

[0028] The temperature detection module is used to detect and monitor temperature data in real time, transmit the temperature data to the microcontroller module for recording, analysis and storage, and use the microcontroller module to generate a temperature curve with the regularly recorded temperature data and store it.

[0029] The current detection module is used to monitor the current signal of the signal output state of the power amplifier module, and feed back the current signal to the micro-control module, thereby obtaining the current data of the power amplifier module; the current detection module at least includes a current detection amplifier and a sampling resistor; the current detection amplifier is connected to the two ends of the sampling resistor, and is used to amplify the current signal on the sampling resistor, and after converting the amplified current signal into a voltage signal, transmit it to the micro-control module to generate the current data of the power amplifier; the sampling resistor is connected to the digital-to-analog conversion module to obtain the signal of the decision instruction made by the micro-control module on controlling the power amplifier module, and after sampling, it is input into the power amplifier module to adjust the static operating point of the power amplifier therein.

[0030] The digital-to-analog conversion module is used to convert the digital signal output by the microcontroller module into an analog signal through circuit design, and then input the analog signal into the sampling resistor in the current detection module to adjust the static operating point of the power amplifier.

[0031] The EVM test module is used to obtain the output signal of the power amplifier module, compare it with the generated signal as a reference signal, measure and calculate the EVM value of the output signal, and send the EVM value to the host computer control module through an adapted communication interface to perform data analysis and processing using a matching software program; when adjusting the static operating point of the power amplifier, different EVM values ​​are obtained using the EVM test module, and the optimal EVM value within a set test cycle is obtained through the matching software program on the host computer control module, and the current setting of the static operating point of the power amplifier corresponding to the optimal EVM value is recorded and stored.

[0032] Specifically, the signal generated by the signal source can be a standard OFDM modulated signal. The signal source needs to have a signal preprocessing capability by setting a signal amplifier, a bandpass filter and a signal modulation device, which is used to modulate the signal generated by the signal source into an analog signal matching the power amplifier, and input the analog signal into the power amplifier module.

[0033] When the automatic adjustment device for the static operating point of the power amplifier is working, after power-on, the micro-control module and the temperature detection module are initialized and configured. At the same time, the upper computer control module sends instructions to the signal source through the adapted communication interface and the network communication protocol to generate a standard OFDM modulated signal. The OFDM modulated signal is converted into an analog signal after signal preprocessing. After the analog signal is input into the power amplifier in the power amplifier module for amplification, the power-amplified signal is output through the output port in the power amplifier module. The power-amplified signal is input into the EVM test module to calculate the EVM value on the one hand, and is input into the micro-control module through the current detection amplifier in the current detection module on the other hand, so as to realize the current monitoring of the power amplifier. When the micro-control module obtains the temperature data from the temperature detection module and the current data from the current detection module, the power-amplified signal is input into the micro-control module to calculate the EVM value on the other hand. After the current detection module obtains the current detection data, the data is transmitted to the host computer control module; the host computer control module sets parameters such as temperature threshold, current threshold, EVM threshold, etc. through a matching software program, and calculates and analyzes the temperature data, current data and the EVM value obtained from the EVM test module to obtain the result data of the calculation and analysis, issues control instructions to the microcontrol module according to the result data, and transmits the result data, parameters and control instructions; the microcontrol module uses an algorithm to extract parameters and control instructions, and makes decisions and judgments based on the extracted results, and uses a digital-to-analog conversion module to convert the digital signal corresponding to the control information for making decisions and judgments by the microcontroller into an analog signal, and then inputs it into the power amplifier module to adjust the static operating point of the power amplifier based on the temperature data and the EVM value.

[0034] In the set test cycle, the temperature detection, EVM test and static operating point adjustment operations are performed in multiple rounds; the microcontroller module generates a temperature detection curve after recording the temperature data obtained in multiple rounds, and adjusts the static operating point corresponding to the power amplifier by adjusting the output of the digital-to-analog conversion module according to the processing and analysis results of the temperature data, so as to achieve temperature compensation when the temperature is abnormal and maintain the operating performance and stability of the entire device; the EVM values ​​obtained in multiple rounds are recorded and analyzed by the matching program software in the host computer control module to find the optimal EVM value, that is, when the EVM value is the minimum, the current monitoring value of the static operating point corresponding to the power amplifier is the optimal static operating current of the power amplifier. The optimal static operating current is written into the microcontroller module for storage. In the subsequent operation process, the microcontroller module will automatically adjust the output of the digital-to-analog conversion module according to the storage, so as to maintain the optimal working state of the power amplifier.

[0035] In a second embodiment of the present invention, Figure 2 As shown, the host computer control module includes a PC host computer and a switch. In order to improve the control performance of the microcontroller module, a high-performance MCU of model STM32F105 is used in this embodiment. STM32F105 has the design features of small size, low power consumption but high integration, and integrates ADC itself, which is more friendly to resource-constrained use conditions. At the same time, STM32F105 can provide comprehensive development support, including STM32CubeMX configuration tools, rich HAL libraries and middleware, to simplify the software development process.

[0036] The PC host computer and the switch transmit signals via a network cable; the switch transmits signals to the STM32F105 via an Ethernet communication interface RJ45 and a network communication protocol TCP / IP.

[0037] The temperature detection module uses a temperature sensor model DS18B20. DS18B20 uses a single bus interface (1-wire), which means that it can communicate with STM32F105 only through a single pin (using a single data line connection method), which greatly simplifies the connection and wiring. It has the characteristics of high accuracy, small size, simple wiring, and strong anti-interference ability. The temperature detection range of the DS18B20 temperature sensor is -55℃ to +125℃, and it also has an accuracy of ±0.5℃ when the temperature range exceeds -10℃ to 85℃. The DS18B20 temperature sensor provides 9-Bit to 12-Bit Celsius temperature measurement accuracy and user-programmable non-volatility, and has the function of triggering alarms for over-temperature and low temperature. In addition, the DS18B20 can be powered directly by the data line without the need for an external power supply.

[0038] The current detection module adopts a current detection amplifier of model INA199. INA199 has the characteristics of low offset but high-precision measurement. Specifically, by adopting a zero-drift architecture, it can maintain a low offset voltage (maximum 150μV) in the entire temperature detection range, thereby achieving high-precision measurement; the INA199 is connected to the ADC input pin of the STM32F105 through its own output pin.

[0039] The digital-to-analog conversion module directly uses a digital-to-analog converter (DAC) chip of model MCP4725A0T. The MCP4725A0T is a single-channel DAC that has low power consumption design performance while ensuring high precision and high resolution. The STM32F105 and the DAC chip MCP4725A0T perform signal transmission via the I2C network communication protocol.

[0040] The EVM test module uses a spectrum analyzer to measure the EVM value. The spectrum analyzer generally has wideband and multi-band signal processing capabilities, a wide dynamic range, and a low noise floor. It can measure weak signals while maintaining high resolution and measurement accuracy, and has many optional measurement modes. The spectrum analyzer is connected to the output port of the power amplifier module via an RF coaxial cable. Specifically, each time the EVM value is measured, the predefined spectrum emission mask (SpectrumEmission Mask, SEM) of the spectrum analyzer is selected to set the center frequency, bandwidth, resolution bandwidth, scan time and power parameters to cover the parameters of the signal to be measured including the frequency range. The EVM value is given by the following formula: , in, Error vector power, is the power of the reference signal provided by the signal source; the error vector is the signal error obtained by taking the output signal of the power amplifier as the measured signal and making a vector difference (on the complex plane) with the reference signal, and the signal error includes information on the amplitude error and the phase error.

[0041] It should be noted that this embodiment combines the DS18B20 temperature sensor with the power amplifier to monitor the operating temperature of the power amplifier in real time and automatically adjust the static operating point according to temperature changes. This combination is not common in traditional power amplifier designs, especially in consumer or general industrial applications.

[0042] In the third embodiment of the present invention, referring to Figure 3 As shown, a method for automatically adjusting the static operating point of a power amplifier is provided. The steps of the method utilize the device of the first embodiment or the second embodiment to automatically adjust the static operating point of the power amplifier. The method specifically includes the following steps: Step 110: Use the host computer control module to send an initialization instruction to the microcontrol module, start the initialization operation of the microcontrol module and the temperature control module, and send the response information of the initialization operation back to the host computer control module for confirmation; use the host computer control module to set parameters, and the parameters at least include temperature threshold, current threshold, EVM threshold and signal source parameters; the signal source generates a signal according to the instruction sent by the host computer control module, and sends an analog signal to the power amplifier module after preprocessing the generated signal, and sends the generated signal back to the host computer control module for recording and storage; Step 120: After the analog signal received by the power amplifier module is amplified by the power amplifier, the signal is output through the output port; on the one hand, the output signal is sent to the EVM test module to detect the signal quality by calculating the EVM value, and the EVM value is transmitted back to the upper computer control module; on the other hand, the current detection amplifier in the current detection module completes the current monitoring of the power amplifier to obtain the current data, and transmits the current data to the micro control module. If the current data deviates from the normal range defined by the current threshold, the micro control module sends an alarm signal to the upper computer control module and starts the circuit protection mechanism; Step 130: Use the temperature detection module to regularly measure the temperature data of the environment in which the device is located, and send the temperature data to the microcontroller module for recording and storage. If the temperature data deviates from the normal range defined by the temperature threshold, the microcontroller module sends an alarm signal to the upper computer control module and starts the temperature protection mechanism; Step 140: The temperature data and current data acquired by the microcontroller module are transmitted to the host computer control module; the host computer control module processes and analyzes the temperature data, current data, EVM value and generated signal according to the set temperature threshold, current threshold, EVM threshold and signal source parameters, issues control instructions to the microcontroller module according to the result data of the processing and analysis, and transmits the result data, parameters and control instructions to the microcontroller module; Step 150: Utilize the MCU in the microcontroller module to extract the parameters and control instructions, and make decisions and judgments based on the extracted contents; utilize the digital-to-analog conversion module to convert the control information of the decision and judgment from digital signals into analog signals, and control and adjust the gate voltage of the power amplifier in the power amplifier module through the sampling resistor in the current detection module, so as to complete the automatic adjustment of the static operating point of the power amplifier based on the temperature data, the current data and the EVM value; Step 160: In the set test cycle By setting time intervals, multiple rounds of temperature data measurement, current data monitoring, EVM value testing and corresponding static operating point adjustment are performed, and the results of each time are recorded and stored; the EVM values ​​obtained in multiple rounds are recorded and analyzed by the program software of the upper computer control module to find the minimum EVM value, and the static operating current value corresponding to the power amplifier is adjusted according to the EVM value as the optimal static operating point of the power amplifier; the optimal static operating point and the corresponding temperature data are written into the microcontroller module for recording and storage, which is used to maintain the optimal working state of the power amplifier by automatically adjusting the output of the digital-to-analog conversion module in subsequent operation.

[0043] Specifically, in S110, the initialization operation of the microcontroller module includes: clock initialization, reset operation, peripheral initialization, and interrupt and exception handling configuration. The peripheral initialization at least includes configuring the mode of the input / output pins of the relevant peripherals, and setting the ADC sampling time, resolution, and reference voltage; the interrupt and exception handling configuration at least includes configuring the interrupt priority, interrupt vector table, and exception handling function.

[0044] Furthermore, the initialization of the temperature detection module includes both automatic reset and register parameter initialization, and the transmission of the initialization instruction issued by the host computer control module to the temperature detection module through the microcontroller module to perform the initialization operation. If the temperature detection module adopts the DS18B20 temperature sensor in the second embodiment, the host computer control module needs to send specific initialization instructions including read, match and skip ROM instructions to the temperature sensor through the microcontroller module to put the temperature sensor into normal working state; it is also necessary to perform equipment calibration and configuration settings, including setting the temperature data conversion mode and resolution, and setting the alarm temperature according to the obtained temperature threshold.

[0045] In the fourth embodiment of the present invention, multiple feedback mechanisms can be added by designing a software program in the host computer control module to improve the stability of the automatic adjustment method of the static operating point of the power amplifier during the operation of the device. The feedback mechanism includes: Increase the interface feedback of the host computer control module, specifically display and call the temperature data, current data, EVM value and real-time information of the generated signal and multi-cycle historical data information regularly fed back by the microcontroller module through charts or numerical displays; The temperature data obtained in multiple rounds are recorded by the microcontroller module to generate a temperature detection curve, and the static operating point corresponding to the power amplifier is adjusted by adjusting the output of the digital-to-analog conversion module according to the processing and analysis results of the temperature data by the host computer control module, so as to achieve temperature compensation when the temperature is abnormal and maintain the operating performance and stability of the entire device; Designing the temperature protection mechanism and the circuit protection mechanism by specifically setting the information content of the alarm signal; the information content may include the alarm type, time information and emergency level classification; A mechanism for limited confirmation and limited failure retransmission of signals received by the host control module and its connected modules, as well as the microcontroller module and its connected modules, is added to reduce signal transmission errors and improve the stability of device operation.

[0046] In this embodiment, the automatic test sequence can also be generated by defining multiple signal sources in the upper computer control module. Generally, the automatic test sequence is generated within the range of frequency below 1 GHz and power below 30 dBm. For example, with a frequency step of 100 MHz and a power step of 5 dBm, the signal source has a frequency of 100 MHz to 1 GHz and a power of dBm to 25 dBm; then using the device and method of the above embodiment, respectively for the automatic test sequence of signals with different frequency and power conditions, the optimal static operating point of the power amplifier is obtained, and recorded and stored; using the stored data of the optimal static operating point, the above range (frequency from 100 MHz to 1 GHz, power from Any input signal (converted to analog signal input) in the automatic test sequence of (dBm to 25dBm) automatically adjusts the power amplifier to the optimal static operating point.

[0047] Compared with the prior art, the present invention provides a device and method for automatically adjusting the static operating point of a power amplifier in the above-mentioned embodiment. Firstly, by combining the power amplifier, the temperature detection module (temperature sensor) and the EVM test module, not only the real-time monitoring of the temperature data is realized, but also the signal quality index embodied by the EVM value can be combined. The static operating point of the power amplifier can be automatically adjusted by using the device and method designed by the present invention, which greatly improves the working efficiency, linearity and stability of the power amplifier; secondly, the process of the EVM test is to directly connect the EVM test device such as the spectrum analyzer with the host computer control module, so it is easy to realize automatic and flexible test setting and data analysis optimization through software programs, thereby improving the intelligence level of the device as well as the system reliability and stability; by using integrated chips in multiple functional modules, such as micro control unit chips and DAC chips, it is easier to realize system integration and automation.

[0048] In addition, the present invention also provides a computer device in one embodiment, including a memory and a processor, the memory stores a computer program, and the processor implements the steps of the power amplifier static operating point automatic adjustment method provided in any of the above embodiments when executing the computer program. The computer device can be a server. The computer device includes a processor, a memory, a communication interface and a database connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store sample data. The communication interface of the computer device is used to communicate with an external terminal through a network connection.

[0049] On the other hand, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method for automatically adjusting the static operating point of a power amplifier provided in any of the above embodiments.

[0050] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0051] Matters not covered by the present invention are known technologies.

[0052] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0053] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present application shall be subject to the attached claims.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A device for automatically adjusting the static operating point of a power amplifier, characterized in that: The device at least includes a power amplifier module, a host computer control module, a microcontroller module, a temperature detection module, a current detection module, a digital-to-analog conversion module and an error vector amplitude test module; an external signal source is connected to the host computer control module and the power amplifier module; The power amplification module is used to receive the signal sent by the signal source as an input signal through the adapted connection cable and the communication interface, and output the signal after power amplification; the power amplification module at least includes an input port, a power amplifier and an output port; The host computer control module is used to issue instructions to control the signal source to generate signals; By interacting with the microcontroller module, operating instructions are issued to other modules in the device, monitoring is implemented, and remote control is performed, including: setting and sending temperature thresholds, current thresholds, error vector amplitude thresholds, and signal source parameters, viewing and obtaining operating status data of the temperature detection module, the current detection module, and the power amplifier module, and storing, analyzing, optimizing, and displaying the operating status data through a matching software program; using a matching software program to analyze the error vector amplitude value obtained from the error vector amplitude test module, and feeding back the analysis results to the microcontroller module to achieve automatic adjustment of the static operating point of the power amplifier; The microcontrol module is used to realize decision control of the temperature detection module, the current detection module and the digital-to-analog conversion module by receiving control instructions and data from the host computer control module; collect, preprocess, calculate, store and output signals through interaction with the temperature detection module, the current detection module and the digital-to-analog conversion module, wherein the signals include temperature data obtained from the temperature detection module, voltage signals obtained from the current detection module, and digital signals transmitted to the digital-to-analog conversion module; The temperature detection module is used to detect and monitor temperature data in real time and transmit the temperature data to the microcontroller module for recording, analysis and storage; The current detection module is used to monitor the current signal of the signal output state of the power amplifier module, and feed back the current signal to the micro-control module to obtain the current data of the power amplifier; the current detection module at least includes a current detection amplifier and a sampling resistor; the current detection amplifier is connected to the two ends of the sampling resistor, and is used to amplify the current signal on the sampling resistor, and after converting the amplified current signal into a voltage signal, transmit it to the micro-control module to generate the current data of the power amplifier; the sampling resistor is connected to the digital-to-analog conversion module to obtain the signal of the decision instruction made by the micro-control module on controlling the power amplifier module, and after sampling, it is input into the power amplifier module to adjust the static working point of the power amplifier therein; The digital-to-analog conversion module is used to convert the digital signal output by the microcontroller module into an analog signal through circuit design, and then input the analog signal into the sampling resistor in the current detection module to adjust the static operating point of the power amplifier. The error vector amplitude test module is used to measure and calculate the error vector amplitude value of the output signal by comparing the output signal of the power amplifier module with the generated signal as a reference signal, and send the error vector amplitude value to the upper computer control module through an adapted communication interface for data analysis and processing.

2. The automatic adjustment device for the static operating point of a power amplifier according to claim 1, characterized in that: The micro-control module at least includes a micro-control unit and an analog-to-digital converter.

3. The automatic adjustment device for the static operating point of a power amplifier according to claim 2, characterized in that: The signal generated by the signal source is a standard OFDM modulated signal; the signal source has a signal preprocessing capability by arranging a signal amplifier, a bandpass filter and a signal modulating device, and is used to modulate the generated signal into an analog signal matching the power amplifier.

4. The automatic adjustment device for the static operating point of a power amplifier according to claim 3, characterized in that: The host computer control module uses a matching software program to analyze the error vector amplitude value obtained from the error vector amplitude test module, including using the matching software program to obtain the minimum error vector amplitude value within a set test cycle, and simultaneously recording and storing the static operating point of the power amplifier corresponding to the minimum error vector amplitude value.

5. The automatic adjustment device for the static operating point of a power amplifier according to claim 4, characterized in that: The host computer control module includes a PC host computer and a switch, the PC host computer and the switch are used to transmit signals via a network cable, and the switch is used to transmit signals to the STM32F105 via an Ethernet communication interface RJ45 and a network communication protocol TCP / IP; The microcontroller unit adopts STM32F105, and the STM32F105 itself integrates an analog-to-digital converter; The temperature detection module adopts a temperature sensor DS18B20, and the temperature sensor DS18B20 adopts a single bus interface to connect with the STM32F105; The current detection module adopts the current detection amplifier INA199; The digital-to-analog conversion module directly adopts the digital-to-analog converter chip MCP4725A0T, and the signal transmission between the STM32F105 and the digital-to-analog converter chip MCP4725A0T is carried out through the I2C network communication protocol; The error vector amplitude test module adopts a spectrum analyzer to measure the error vector amplitude value. The spectrum analyzer is connected to the output port of the power amplifier module through a radio frequency coaxial cable.

6. A method for automatically adjusting the static operating point of a power amplifier, characterized in that: The method of realizing automatic adjustment of the static operating point of a power amplifier by using the device as claimed in claim 1 comprises: Step 110: using the host computer control module to send an initialization instruction to the microcontrol module, start the initialization operation of the microcontrol module and the temperature control module, and send the response information of the initialization operation back to the host computer control module for confirmation; using the host computer control module to set parameters, the parameters at least include a temperature threshold, a current threshold, an error vector amplitude threshold and a signal source parameter; the signal source generates a signal according to the instruction sent by the host computer control module, and after pre-processing the generated signal, sends an analog signal to the power amplifier module, and sends the generated signal back to the host computer control module for recording and storage; Step 120: After the analog signal received by the power amplifier module is amplified by the power amplifier, the signal is output through the output port; on the one hand, the output signal is sent to the error vector amplitude test module to detect the signal quality by calculating the error vector amplitude value, and the error vector amplitude value is transmitted back to the upper computer control module; on the other hand, the current detection amplifier in the current detection module completes the current monitoring of the power amplifier to obtain the current data, and transmits the current data to the micro control module. If the current data deviates from the normal range defined by the current threshold, the micro control module sends an alarm signal to the upper computer control module and starts the circuit protection mechanism; Step 130: Use the temperature detection module to regularly measure the temperature data of the environment in which the device is located, and send the temperature data to the microcontroller module for recording and storage. If the temperature data deviates from the normal range defined by the temperature threshold, the microcontroller module sends an alarm signal to the upper computer control module and starts the temperature protection mechanism; Step 140: The temperature data and current data acquired by the microcontroller module are transmitted to the host computer control module; the host computer control module processes and analyzes the temperature data, current data, error vector amplitude value and generated signal according to the set temperature threshold, current threshold, error vector amplitude threshold and signal source parameter, issues a control instruction to the microcontroller module according to the result data of the processing and analysis, and transmits the result data, parameters and control instruction to the microcontroller module; Step 150: Utilize the microcontroller unit in the microcontroller module to extract the parameters and control instructions, and make decisions and judgments based on the extracted contents; utilize the digital-to-analog conversion module to convert the control information of the decision and judgment from digital signals into analog signals, and control and adjust the gate voltage of the power amplifier in the power amplifier module through the sampling resistor in the current detection module, so as to complete the automatic adjustment of the static operating point of the power amplifier based on the temperature data, the current data and the error vector amplitude value; Step 160: In the set test cycle By setting time intervals, multiple rounds of temperature data measurement, current data monitoring, error vector amplitude value testing and corresponding static operating point adjustment are performed, and the results of each time are recorded and stored; the error vector amplitude values ​​obtained in multiple rounds are recorded and analyzed by the software program of the host computer control module to find the minimum error vector amplitude value, and the static operating current value corresponding to the power amplifier is adjusted according to the error vector amplitude value as the optimal static operating point of the power amplifier; the optimal static operating point and the corresponding temperature data are written into the microcontroller module for recording and storage, and are used to maintain the optimal working state of the power amplifier by automatically adjusting the output of the digital-to-analog conversion module in subsequent operation.

7. The method for automatically adjusting the static operating point of a power amplifier according to claim 6, characterized in that: By defining an automatic test sequence of signals generated by multiple signal sources in a host computer control module, the optimal static operating point of the power amplifier is obtained for the generated signals with different frequency and power conditions in the automatic test sequence, and the optimal static operating point is recorded and stored; using the stored optimal static operating point, any generated signal within the range of the automatic test sequence is preprocessed and used as the input signal of the power amplifier to automatically adjust the optimal static operating point of the power amplifier; The signal source has a frequency range of 100MHz to 1GHz and a power range of Generate automatic test sequences in the design space from dBm to 25dBm with a frequency step of 100MHz and a power step of 5dBm.

8. The method for automatically adjusting the static operating point of a power amplifier according to claim 7, characterized in that: The host computer control module is used to design a display interface, and the temperature data, current data, error vector amplitude value and real-time information and historical information of the generated signal regularly fed back by the microcontroller module are displayed and called in the form of charts or data interface feedback; A mechanism for limited confirmation of signal reception and limited failure retransmission is added between the host computer control module and the signal source, the error vector amplitude test module and the microcontroller module, and between the microcontroller module and the temperature detection module, the current detection module and the digital-to-analog conversion module to reduce signal transmission errors.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method for automatically adjusting the static operating point of a power amplifier as claimed in any one of claims 6 to 8 are implemented.

10. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for automatically adjusting the static operating point of a power amplifier as claimed in any one of claims 6 to 8 are implemented.

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