Intelligent tuning radio frequency system

Abstract

The invention relates to the technical field of radio frequency communication, and particularly provides an intelligent tuning radio frequency system, which comprises a BAW filter; a tuning processing module and an impedance tuning module are integrated in the main control unit; the radio frequency signal link comprises an adjustable impedance matching network, and the adjustable impedance matching network is connected with an impedance tuning module and a BAW filter; the state sensing unit is used for collecting working parameters of the radio frequency signal link and temperature information of the BAW filter; the tuning processing module is used for acquiring a target tuning voltage according to the working parameters, the temperature information and a pre-constructed conversion relation; the impedance tuning module is used for adjusting the output voltage according to the target tuning voltage so as to adjust the impedance value of the adjustable impedance matching network; the system can realize a dynamic tuning function without increasing the volume.

Description

Technical Field

[0001] This application relates to the field of radio frequency communication technology, and more specifically, to an intelligent tuning radio frequency system. Background Technology

[0002] As 5G / 6G communication technologies continue to evolve towards millimeter-wave bands, and spectrum resources become increasingly scarce, higher demands are being placed on the complexity, power consumption, and linearity of RF front-end systems. Bulk acoustic wave (BAW) filters, due to their high Q value, low insertion loss, and excellent frequency selectivity, have become core components for high-performance RF front-end filtering. However, the highly optimized performance of BAW filters heavily depends on their terminal impedance matching. In real-world dynamic operating environments, the impedance and return loss of BAW filters drift significantly with dynamic changes in chip junction temperature, output power, and operating frequency band, leading to decreased signal integrity, reduced system efficiency, and potentially out-of-band spurious emissions.

[0003] To address the aforementioned performance drift issue, current industry solutions primarily revolve around an external dedicated dynamic tuning chip. This approach utilizes a dedicated tuning chip, independent of the main control IC, integrating a high-precision digital-to-analog converter (DAC) and control logic to drive an external adjustable matching network (typically based on varactor diodes or RF-MEMS) of the BAW filter. Its working principle is as follows: the dedicated tuning chip, through a built-in temperature sensor or receiving frequency band commands from the baseband, queries its internally stored tuning map table and outputs one or more analog tuning voltages to change the impedance of the matching network, compensating for performance deviations caused by environmental changes. This hardware tuning technology offers advantages such as fast response speed and high tuning accuracy, achieving dynamic optimization of filter performance to a certain extent.

[0004] However, while the existing external dedicated dynamic tuning chip solution has some effect on improving the performance drift of BAW filters, its inherent defects limit its widespread application. This standalone chip solution requires additional printed circuit board (PCB) area, which contradicts the trend of device miniaturization, while also increasing system material costs. Furthermore, as an independent functional unit, it has its own significant static and dynamic power consumption, putting pressure on the device's battery life.

[0005] There is currently no effective technical solution to the above problems. Summary of the Invention

[0006] The purpose of this application is to provide an intelligent tuning radio frequency system that can achieve dynamic tuning without increasing its size.

[0007] This application provides an intelligent tuning radio frequency system, which includes: The main control unit integrates a tuning processing module and an impedance tuning module. The radio frequency signal link includes an adjustable impedance matching network and a BAW filter, with the adjustable impedance matching network connected to the impedance tuning module and the BAW filter. The status sensing unit is connected to the RF signal link and is used to collect the operating parameters of the RF signal link and the temperature information of the BAW filter. The tuning processing module is used to obtain the target tuning voltage based on operating parameters, temperature information, and pre-built conversion relationships; The impedance tuning module is used to adjust its output voltage according to the target tuning voltage in order to adjust the impedance value of the adjustable impedance matching network.

[0008] This application provides an intelligent tuning RF system that eliminates the need for an external dedicated tuning chip and its peripheral circuitry by integrating the module for adjusting the impedance of the BAW filter into the main control unit. This achieves dynamic tuning functionality without increasing the system's size, resulting in a high degree of integration. Since this application eliminates the need for a dedicated tuning chip and related peripheral components, it effectively reduces the bill of materials cost of the intelligent tuning RF system and simplifies PCB layout complexity and system calibration processes, thereby significantly reducing production and overall system costs. Furthermore, because the tuning function shares the computing and power resources of the main control IC, its own static and dynamic power consumption is negligible, effectively reducing the power consumption of the intelligent tuning RF system and thus alleviating the pressure on device battery life.

[0009] Optionally, operating parameters include operating frequency and transmit power.

[0010] Optionally, the main control unit also integrates an antenna tuning module and a bias voltage adjustment module. The RF signal link also includes a power amplifier and an antenna tuning switch. The input of the power amplifier is connected to the bias voltage adjustment module, and the output of the power amplifier is connected to an adjustable impedance matching network. The antenna tuning switch is connected to the BAW filter and the antenna tuning module. The tuning processing module is also used to obtain the target bias voltage and target tuning state based on the operating parameters, temperature information, and pre-built conversion relationship. The antenna tuning module is used to adjust the tuning state of the antenna tuning switch according to the target tuning state, and the bias voltage adjustment module is used to adjust the bias voltage of the power amplifier according to the target bias voltage.

[0011] This technical solution is equivalent to co-optimizing the BAW filter, power amplifier, and antenna in the RF signal link based on operating parameters and temperature information. Therefore, this technical solution can effectively improve the overall performance stability, power efficiency, and signal quality of the intelligent tuned RF system under various complex operating conditions.

[0012] Optionally, the pre-built conversion relationship is a mapping table of combinations of frequency, power, and temperature and their corresponding combinations of tuning voltage, bias voltage, and tuning state. The process by which the tuning processing module obtains the target tuning voltage, target bias voltage, and target tuning state based on the operating parameters, temperature information, and the pre-built conversion relationship includes: A1. Based on the operating frequency, transmit power, and temperature information, extract the corresponding tuning voltage as the target tuning voltage from the mapping table of combinations of frequency, power, and temperature and their corresponding combinations of tuning voltage, bias voltage, and tuning state. Extract the corresponding bias voltage as the target bias voltage and the corresponding tuning state as the target tuning state.

[0013] Optionally, the antenna tuning switch is connected to the antenna, and the pre-construction process of the mapping table of combinations of frequency, power, and temperature and their corresponding combinations of tuning voltage, bias voltage, and tuning state includes: B1. For each parameter combination in the parameter combination set, the control impedance tuning module adjusts its output voltage within a preset range with a preset step size, and takes the output voltage when the return loss of the BAW filter is minimized as the tuning voltage corresponding to that parameter combination; the parameter combination includes frequency, power and temperature, and the frequency, power and temperature combinations corresponding to all parameter combinations are different. B2. For each parameter combination, control the bias voltage adjustment module to adjust the bias voltage within its operating range, and take the bias voltage corresponding to the highest efficiency of the power amplifier as the bias voltage corresponding to that parameter combination. B3. For each parameter combination, the control antenna tuning module adjusts the tuning state of the antenna tuning switch according to all the tuning states it stores, and takes the tuning state with the minimum return loss of the antenna as the adjustment state corresponding to that parameter combination. B4. For each parameter combination, integrate the parameter combination and its corresponding tuning voltage, bias voltage and tuning state into a mapping relationship between the combination of frequency, power and temperature and its corresponding tuning voltage, bias voltage and tuning state. B5. Integrate all the mapping relationships between combinations of frequency, power, and temperature and their corresponding combinations of tuning voltage, bias voltage, and tuning state into a mapping relationship table for combinations of frequency, power, and temperature and their corresponding combinations of tuning voltage, bias voltage, and tuning state.

[0014] Optionally, the state sensing unit includes a temperature sensor and a power detector, and the RF signal link also includes an RF transceiver. The temperature sensor is mounted on the surface of the BAW filter and is used to collect the temperature information of the BAW filter. The operating frequency of the RF signal link is output by the RF transceiver. The power detector is located between the power amplifier and the adjustable impedance matching network and is used to collect the transmit power of the RF signal link.

[0015] Optionally, the adjustable impedance matching network may employ a π-type topology, a T-type topology, or an L-type topology.

[0016] Optionally, the adjustable impedance matching network includes an RF choke, an impedance matching inductor, a first DC blocking capacitor, a second DC blocking capacitor, a first varactor diode, and a second varactor diode. One end of the first DC blocking capacitor is connected to the input terminal of the adjustable impedance matching network. The other end of the first DC blocking capacitor is connected to one end of the first varactor diode, one end of the RF choke, and one end of the impedance matching inductor, respectively. One end of the second varactor diode is connected to one end of the RF choke, the other end of the impedance matching inductor, and one end of the second DC blocking capacitor, respectively. The other ends of both the first and second varactor diodes are grounded. The other end of the second DC blocking capacitor is connected to the output terminal of the adjustable impedance matching network. The other end of the RF choke is connected to the impedance tuning module.

[0017] Optionally, the impedance tuning module includes a digital-to-analog converter, and the reference voltage source of the digital-to-analog converter integrates a temperature compensation circuit, which is used to perform voltage regulation compensation on the reference voltage source.

[0018] This technical solution integrates a temperature compensation circuit within the reference voltage source of the digital-to-analog converter (DAC), enabling the output voltage of the reference voltage source to remain highly stable under different temperature conditions. Specifically, when the ambient temperature or the internal temperature of the chip changes, the temperature compensation circuit senses these changes and automatically adjusts to offset the effect of temperature on the output voltage of the reference voltage source. Therefore, this technical solution ensures that the DAC always obtains an accurate and stable reference voltage, thereby guaranteeing the accuracy and stability of its output voltage. This voltage regulation and compensation mechanism ensures that the impedance tuning module can continuously provide an accurate tuning voltage, thereby precisely controlling the impedance value of the adjustable impedance matching network.

[0019] Optionally, the intelligent tuning RF system also includes a current sampling circuit and a protection circuit. The input terminal of the current sampling circuit is connected to the output terminal of the digital-to-analog converter, and the output terminal of the current sampling circuit is connected to the protection circuit. The current sampling circuit is used to collect the output current of the digital-to-analog converter, and the protection circuit is used to set the output of the digital-to-analog converter to a high-impedance state or turn off the output voltage of the digital-to-analog converter when the output current is greater than or equal to a preset output current.

[0020] As can be seen from the above, the intelligent tuning RF system provided in this application eliminates the need for external dedicated tuning chips and their peripheral circuits by integrating the module for adjusting the impedance of the BAW filter into the main control unit. That is, this application achieves dynamic tuning function without increasing the size, thus realizing a high degree of integration of the intelligent tuning RF system. Since this application does not require dedicated tuning chips and related peripheral components, it can effectively reduce the bill of materials cost of the intelligent tuning RF system and effectively simplify the PCB layout complexity and system calibration process, thereby effectively reducing the production cost and overall system cost of the intelligent tuning RF system. Furthermore, since the tuning function of this application shares the computing and power resources of the main control IC, its own added static and dynamic power consumption is negligible. Therefore, this application can effectively reduce the power consumption of the intelligent tuning RF system, thereby effectively reducing the pressure on device battery life. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of an intelligent tuning radio frequency system provided in an embodiment of this application.

[0022] Figure 2 This is a schematic diagram of the adjustable impedance matching network provided in an embodiment of this application.

[0023] Reference numerals: 1. Main control unit; 11. Tuning processing module; 12. Impedance tuning module; 13. Bias voltage adjustment module; 14. Antenna tuning module; 2. RF signal link; 21. RF transceiver; 22. Power amplifier; 23. Adjustable impedance matching network; 231. First DC blocking capacitor; 232. Second DC blocking capacitor; 233. Impedance matching inductor; 234. RF choke; 235. First varactor diode; 236. Second varactor diode; 24. BAW filter; 25. Antenna tuning switch; 26. Antenna; 3. Status sensing unit; 31. Temperature sensor; 32. Power detector. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0025] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] like Figure 1 and Figure 2 As shown, this application provides an intelligent tuning radio frequency system, which includes: The main control unit 1 integrates a tuning processing module 11 and an impedance tuning module 12. Radio frequency signal link 2 includes an adjustable impedance matching network 23 and a BAW filter 24, wherein the adjustable impedance matching network 23 is connected to the impedance tuning module 12 and the BAW filter 24. The state sensing unit 3 is connected to the radio frequency signal link 2 and is used to collect the operating parameters of the radio frequency signal link 2 and the temperature information of the BAW filter 24. The tuning processing module 11 is used to obtain the target tuning voltage based on the operating parameters, temperature information and pre-built conversion relationship; Impedance tuning module 12 is used to adjust its output voltage according to the target tuning voltage in order to adjust the impedance value of adjustable impedance matching network 23.

[0027] This application integrates the tuning processing module 11 and the impedance tuning module 12 into the main control unit 1, realizing system-level integration of the tuning function. This effectively solves the problems of size, cost and power consumption caused by external dedicated tuning chips in the prior art. At the same time, by dynamically adjusting the impedance value of the adjustable impedance matching network 23, it ensures that the BAW filter 24 always maintains the best matching state under various dynamic working conditions, thereby improving the overall performance and stability of the RF system.

[0028] To better understand the intelligent tuning RF system proposed in this application, the key terms and components involved will be explained in detail below. The main control unit 1 of this embodiment is the core processing unit of the intelligent tuning RF system. This unit is responsible for coordinating and controlling the work of various modules. It integrates a tuning processing module 11 and an impedance tuning module 12. Therefore, this embodiment is equivalent to the integration of software and hardware to achieve the tuning function. The tuning processing module 11 of this embodiment is a functional module within the main control unit 1. This module is responsible for generating a target tuning voltage for adjusting the impedance value of the adjustable impedance matching network 23 based on the collected operating parameters and temperature information, combined with a preset conversion relationship. The impedance tuning module 12 of this embodiment is another functional module within the main control unit 1. This module is used to adjust its own output voltage according to the target tuning voltage output by the tuning processing module 11, in order to control the impedance value of the adjustable impedance matching network 23. The RF signal link 2 of this embodiment is the path for RF signal transmission, which includes the adjustable impedance matching network 23 and the BAW filter 24. This RF signal link 2 belongs to the existing RF system signal links, and its specific structure and working principle will not be discussed in detail here. The adjustable impedance matching network 23 in this embodiment is a circuit network capable of changing its own impedance value. This embodiment achieves optimal impedance matching between the BAW filter 24 and the RF signal link 2 by adjusting the impedance value of the adjustable impedance matching network 23, thereby minimizing signal reflection and power loss. The BAW filter 24 in this embodiment is an RF filter based on the principle of bulk acoustic wave resonance. The BAW filter 24 has a high Q value, low insertion loss, and excellent frequency selectivity. It is commonly used in RF front-ends to filter out unwanted frequency components. The performance of the BAW filter 24 is highly sensitive to the impedance matching state. The state sensing unit 3 in this embodiment is responsible for real-time monitoring of the operating parameters of the RF signal link 2 and the temperature information of the BAW filter 24, providing necessary input data to the tuning processing module 11.

[0029] The intelligent tuning RF system of this application achieves intelligent dynamic tuning of the impedance matching of the BAW filter 24 through integrated design. Specifically, the BAW filter 24 is a key filtering component in the RF signal link 2, and its performance directly affects the signal quality of the entire system. To ensure that the BAW filter 24 maintains optimal performance under different operating conditions, its impedance needs to be dynamically matched. The main control unit 1 is the core of this system, which integrates the tuning processing module 11 and the impedance tuning module 12. This integration method can significantly improve the system integration and reduce the number of external components. For example, the tuning processing module 11 can be a software module that runs a specific algorithm or a dedicated hardware logic circuit used to process input data and calculate the target tuning voltage; the impedance tuning module 12 can be a digital-to-analog converter (DAC), whose output voltage is used to control the variable elements in the adjustable impedance matching network 23, such as varactor diodes. Radio frequency (RF) signal link 2 is the channel for RF signal transmission, which includes an adjustable impedance matching network 23. The adjustable impedance matching network 23 can adopt various topologies and can be composed of inductors, capacitors, and variable reactance elements (such as varactor diodes). In this embodiment, the impedance of the adjustable impedance matching network 23 can be adjusted by changing the control voltage of the variable reactance elements. The state sensing unit 3 in this embodiment is responsible for collecting the operating parameters of the RF signal link 2 and the temperature information of the BAW filter 24. The operating parameters may include the operating frequency and transmit power, and the temperature information can be collected by a temperature sensor 31 disposed on the surface of the BAW filter 24. This information forms the basis for the tuning processing module 11 to make decisions. In this embodiment, the tuning processing module 11 receives operating parameters and temperature information from the state sensing unit 3. Subsequently, the tuning processing module 11 obtains the target tuning voltage based on this information and a pre-built conversion relationship. For example, the conversion relationship can be a multi-dimensional lookup table that stores the optimal tuning voltage values ​​corresponding to different combinations of operating parameters and temperature conditions. In this embodiment, the target tuning voltage can be obtained by extracting the corresponding optimal tuning voltage value from the multi-dimensional lookup table based on the actual operating parameters and temperature information. It should be understood that when there are no operating parameters and temperature information corresponding to the actual operating parameters and temperature information in the multi-dimensional lookup table, this embodiment can use the optimal tuning voltage value corresponding to the operating parameters and temperature information with the highest similarity to the actual operating parameters and temperature information in the multi-dimensional lookup table as the target tuning voltage.In this embodiment, the impedance tuning module 12 receives the target tuning voltage output by the tuning processing module 11 and adjusts its output voltage accordingly. This output voltage is then applied to the adjustable impedance matching network 23, thereby changing the impedance value of the adjustable impedance matching network 23. For example, if the adjustable impedance matching network 23 contains a varactor diode, the output voltage of the impedance tuning module 12 will change the junction capacitance of the varactor diode, thus adjusting the impedance of the entire network. Through the coordinated operation of the above modules, the intelligent tuning RF system of this application can achieve real-time and dynamic adjustment of the impedance of the BAW filter 24, ensuring that it maintains excellent performance under various complex operating conditions.

[0030] The intelligent tuning RF system of this application effectively solves the problems of size, cost, and power consumption caused by external dedicated tuning chips in the prior art by integrating the tuning processing module 11 and the impedance tuning module 12 into the main control unit 1. When the operating parameters of the RF signal link 2 or the temperature information of the BAW filter 24 change, the state sensing unit 3 collects these data in real time, and these data are transmitted to the tuning processing module 11 in the main control unit 1. The tuning processing module 11 obtains the target tuning voltage required under the current operating condition based on these real-time data and combined with a pre-built conversion relationship (e.g., a lookup table storing the optimal tuning voltage under different operating conditions). Subsequently, the target tuning voltage is sent to the impedance tuning module 12 in the main control unit 1. The impedance tuning module 12 adjusts its output voltage according to the received target tuning voltage and applies the adjusted voltage to the adjustable impedance matching network 23 in the RF signal link 2. After receiving the voltage, the parameters of the variable components (such as varactor diodes) inside the adjustable impedance matching network 23 change accordingly, thereby dynamically adjusting the impedance value of the adjustable impedance matching network 23. In this way, the impedance matching between the BAW filter 24 and the RF signal link 2 is optimized in real time to minimize signal reflection and power loss, thereby ensuring that the BAW filter 24 maintains optimal performance under various dynamic operating conditions. The entire process forms a closed-loop control system, enabling the RF system to intelligently adapt to changes in the external environment and operating conditions, thus guaranteeing performance stability under all operating conditions.

[0031] The intelligent tuning RF system of this application demonstrates significant innovation and advantages in solving existing technical problems. Specifically, traditional solutions rely on external dedicated tuning chips, which not only increases the footprint of the printed circuit board (PCB) and the system's material costs, but also introduces additional static and dynamic power consumption, contradicting the current trend of miniaturization and low power consumption in devices. The core innovation of this application lies in integrating the tuning processing module 11 and the impedance tuning module 12 as IP cores within the main control unit 1. This highly integrated design has the following beneficial effects: First, it significantly improves system integration and eliminates the need for external dedicated tuning chips and their peripheral circuits, achieving dynamic tuning functionality without adding extra volume, which is particularly important for compact electronic devices; second, it significantly reduces the overall system cost. Since this application eliminates dedicated tuning chips and related peripheral components, it directly reduces the bill of materials (BOM) cost, while simplifying PCB layout complexity and system calibration processes. Therefore, this application can effectively control the production cost of the intelligent tuning RF system. Furthermore, this application exhibits excellent power efficiency. Since the tuning processing module 11 and impedance tuning module 12, which implement the tuning function, share the computational and power resources of the main control unit 1, and the static and dynamic power consumption added by the tuning processing module 11 and impedance tuning module 12 themselves is negligible, this application can effectively reduce the power loss of the entire intelligent tuning RF system. Finally, this application uses the state sensing unit 3 to collect operating parameters and temperature information in real time, and combines this with a pre-built conversion relationship to obtain the target tuning voltage, thereby adjusting the impedance value of the adjustable impedance matching network 23 to ensure performance stability under all operating conditions. This dynamic tuning mechanism can accurately compensate for performance fluctuations caused by self-heating effects, changes in ambient temperature, and frequency band switching in real time, maintaining excellent return loss and signal quality under all operating conditions. Therefore, the intelligent tuning RF system provided by this application is superior to existing technologies in terms of integration, cost, power consumption, and performance stability. Thus, this application provides a better solution for high-performance RF front-end systems.

[0032] This application provides an intelligent tuning RF system that eliminates the need for an external dedicated tuning chip and its peripheral circuitry by integrating the module for adjusting the impedance of the BAW filter 24 into the main control unit 1. This achieves dynamic tuning functionality without increasing the system's size, resulting in a high degree of integration. Since this application eliminates the need for a dedicated tuning chip and related peripheral components, it effectively reduces the bill of materials cost of the intelligent tuning RF system and simplifies PCB layout complexity and system calibration procedures, thereby significantly reducing production costs and overall system costs. Furthermore, because the tuning function shares the computing and power resources of the main control IC, its own static and dynamic power consumption is negligible, effectively reducing the power consumption of the intelligent tuning RF system and thus alleviating the pressure on device battery life.

[0033] In some preferred embodiments, the operating parameters include operating frequency and transmit power. The operating frequency in this embodiment refers to the frequency of the radio frequency signal currently being transmitted or processed by the radio frequency signal link 2, which directly affects the resonant characteristics of the BAW filter 24 and the matching state of the adjustable impedance matching network 23. The transmit power in this embodiment refers to the power of the radio frequency signal output by the radio frequency signal link 2, which may cause self-heating effects on the internal components of the radio frequency link, thereby affecting the performance of the BAW filter 24.

[0034] In some preferred embodiments, the main control unit 1 also integrates an antenna tuning module 14 and a bias voltage adjustment module 13. The radio frequency signal link 2 also includes a power amplifier 22 and an antenna tuning switch 25. The input terminal of the power amplifier 22 is connected to the bias voltage adjustment module 13, and the output terminal of the power amplifier 22 is connected to the adjustable impedance matching network 23. The antenna tuning switch 25 is connected to the BAW filter 24 and the antenna tuning module 14. The tuning processing module 11 is also used to obtain the target bias voltage and the target tuning state according to the operating parameters, temperature information and pre-built conversion relationship. The antenna tuning module 14 is used to adjust the tuning state of the antenna tuning switch 25 according to the target tuning state. The bias voltage adjustment module 13 is used to adjust the bias voltage of the power amplifier 22 according to the target bias voltage.

[0035] The main control unit 1 in this embodiment further integrates an antenna tuning module 14 and a bias adjustment module 13. The antenna tuning module 14 can be understood as a logic or circuit unit for controlling the tuning state of the antenna tuning switch 25. This module optimizes the impedance matching of the antenna 26 to ensure efficient transmission or reception of radio frequency signals from the antenna 26. The bias adjustment module 13 is a circuit unit for adjusting the bias voltage of the power amplifier 22. This module optimizes the operating efficiency and linearity of the power amplifier 22, thereby improving the amplification quality of the radio frequency signal. The radio frequency signal link 2 in this embodiment also includes a power amplifier 22 and an antenna tuning switch 25. The power amplifier 22 is a key component in the radio frequency system for amplifying radio frequency signals. The performance of the power amplifier 22 directly affects the system's transmission power and efficiency. The antenna tuning switch 25 adjusts the impedance matching of the antenna 26 under different operating conditions, for example, by switching different capacitor or inductor combinations to ensure optimal signal transmission efficiency. In this embodiment, the input terminal of the power amplifier 22 is connected to the bias adjustment module 13, enabling the bias adjustment module 13 to precisely control the operating point of the power amplifier 22. The output terminal of the power amplifier 22 is connected to the adjustable impedance matching network 23 to ensure that the amplified signal can be efficiently transmitted to the BAW filter 24. In this embodiment, the antenna tuning switch 25 is connected to the BAW filter 24 and the antenna tuning module 14. The antenna tuning module 14 controls the antenna tuning switch 25 to dynamically adjust the impedance of the antenna 26. This embodiment extends the function of the tuning processing module 11 so that it can not only obtain the target tuning voltage based on operating parameters (e.g., operating frequency and transmit power) and temperature information, but also obtain the target bias voltage and target tuning state based on this information and a preset conversion relationship. The target bias voltage is used to optimize the bias voltage of the power amplifier 22, and the target tuning state is used to control the antenna tuning switch 25 to optimize the tuning state of the antenna 26.

[0036] This embodiment integrates the antenna tuning module 14 and the bias voltage adjustment module 13 into the main control unit 1, and expands the functionality of the tuning processing module 11. This allows the tuning processing module 11 to simultaneously acquire the target tuning voltage, target bias voltage, and target tuning state. Specifically, the tuning and control of the BAW filter 24, power amplifier 22, and antenna tuning switch 25 in the RF signal link 2 are all uniformly managed and synchronized by the main control unit 1. Specifically, when the operating parameters of the RF signal link 2 (such as operating frequency and transmit power) or the temperature information of the BAW filter 24 change, the tuning processing module 11 can generate, in real time, the target tuning voltage, target bias voltage, and target tuning state that match the current operating conditions based on a preset conversion relationship. Subsequently, the impedance tuning module 12, bias voltage adjustment module 13, and antenna tuning module 14 synchronously adjust the bias voltage of the adjustable impedance matching network 23, the power amplifier 22, and the tuning state of the antenna tuning switch 25 according to these target values. This synchronous control mechanism ensures precise alignment of state changes among components in the RF link, avoiding performance degradation caused by inconsistent response times of different components. Therefore, this embodiment is equivalent to collaboratively optimizing the BAW filter 24, power amplifier 22, and antenna 26 in RF signal link 2 based on operating parameters and temperature information. Thus, this embodiment effectively improves the overall performance stability, power efficiency, and signal quality of the intelligent tuned RF system under various complex operating conditions. It should be understood that since the antenna tuning module 14 and bias adjustment module 13 are both integrated within the main control unit 1, this embodiment achieves collaborative optimization of the BAW filter 24, power amplifier 22, and antenna 26 in RF signal link 2 without significantly increasing the power consumption of the intelligent tuned RF system.

[0037] In some preferred embodiments, the pre-built conversion relationship is a mapping table of combinations of frequency, power, and temperature and their corresponding combinations of tuning voltage, bias voltage, and tuning state. The process by which the tuning processing module 11 obtains the target tuning voltage, target bias voltage, and target tuning state based on the operating parameters, temperature information, and the pre-built conversion relationship includes: A1. Based on the operating frequency, transmit power, and temperature information, extract the corresponding tuning voltage as the target tuning voltage from the mapping table of combinations of frequency, power, and temperature and their corresponding combinations of tuning voltage, bias voltage, and tuning state. Extract the corresponding bias voltage as the target bias voltage and the corresponding tuning state as the target tuning state.

[0038] The core of step A1 lies in the extraction operation. That is, the tuning processing module 11 no longer needs to perform complex real-time calculations, but directly uses the current operating frequency, transmission power and temperature information as query indexes to search in the pre-built mapping relationship table, thereby quickly obtaining the tuning voltage, bias voltage and tuning state that best match the current operating conditions, and taking the tuning voltage, bias voltage and tuning state as the target tuning voltage, target bias voltage and target tuning state respectively.

[0039] This embodiment effectively solves the efficiency and real-time problems that may arise from traditional real-time calculations or iterative adjustments by introducing a pre-built mapping table and using a lookup-based approach to obtain the target tuning voltage, target bias voltage, and target tuning state. Specifically, before the system runs, tuning parameters (combinations of tuning voltage, bias voltage, and tuning state) under various operating conditions (combinations of frequency, power, and temperature) are pre-stored in the mapping table through offline calibration and optimization. When the intelligent tuning RF system is running, the operating frequency, transmit power, and temperature information collected in real time by the state sensing unit 3 are used as query conditions, and the tuning processing module 11 performs a fast lookup in the mapping table based on this query. This lookup table mechanism avoids complex mathematical model calculations and time-consuming iterative processes, and significantly shortens the parameter acquisition time. Therefore, this embodiment ensures that the tuning processing module 11 provides accurate control parameters with extremely high efficiency and real-time performance, enabling the impedance tuning module 12, bias adjustment module 13, and antenna tuning module 14 to respond quickly and adjust the impedance value of the adjustable impedance matching network 23, the bias voltage of the power amplifier 22, and the tuning state of the antenna tuning switch 25 in a timely manner. This ensures that the entire RF signal link 2 remains in optimal matching and performance state under dynamically changing operating conditions. It is evident that because this embodiment uses a pre-built mapping table for parameter extraction, the computational burden of the tuning processing module 11 is significantly reduced. Therefore, this embodiment effectively improves the response speed and tuning accuracy of the intelligent tuning RF system under complex and variable operating conditions, and effectively reduces the resource consumption of the main control unit 1, thereby effectively improving the overall operating efficiency of the intelligent tuning RF system. Furthermore, this lookup table-based mechanism ensures that the target tuning parameters (target tuning voltage, target bias voltage, and target tuning state) can be obtained quickly and accurately under various operating frequencies, transmit power, and temperature combinations. These target tuning parameters are used to effectively compensate for performance fluctuations caused by self-heating effects, changes in ambient temperature, and frequency band switching, thereby ensuring the performance stability of RF signal link 2 under all operating conditions, and effectively reducing the return loss of RF signal link 2 and improving the signal quality of RF signal link 2.

[0040] In some preferred embodiments, the antenna tuning switch 25 is connected to the antenna 26, and the pre-construction process of a mapping table of combinations of frequency, power, and temperature and their corresponding combinations of tuning voltage, bias voltage, and tuning state includes: B1. For each parameter combination in the parameter combination set, the control impedance tuning module 12 adjusts its output voltage within a preset range with a preset step size, and takes the output voltage of the BAW filter 24 when the return loss is minimized as the tuning voltage corresponding to that parameter combination; the parameter combination includes frequency, power and temperature, and the frequency, power and temperature combinations corresponding to all parameter combinations are different. B2. For each parameter combination, the bias voltage adjustment module 13 is controlled to adjust the bias voltage within its operating range, and the bias voltage corresponding to the highest efficiency of the power amplifier 22 is taken as the bias voltage corresponding to that parameter combination. B3. For each parameter combination, the control antenna tuning module 14 adjusts the tuning state of the antenna tuning switch 25 according to all the tuning states it stores, and takes the tuning state with the minimum return loss of the antenna 26 as the adjustment state corresponding to the parameter combination. B4. For each parameter combination, integrate the parameter combination and its corresponding tuning voltage, bias voltage and tuning state into a mapping relationship between the combination of frequency, power and temperature and its corresponding tuning voltage, bias voltage and tuning state. B5. Integrate all the mapping relationships between combinations of frequency, power, and temperature and their corresponding combinations of tuning voltage, bias voltage, and tuning state into a mapping relationship table for combinations of frequency, power, and temperature and their corresponding combinations of tuning voltage, bias voltage, and tuning state.

[0041] Step B1 aims to find the optimal impedance matching point for the BAW filter 24. Step B1 adjusts the output voltage in fine steps within a preset voltage range using the impedance tuning module 12 and monitors the return loss of the BAW filter 24 in real time. This allows for the precise determination of the tuning voltage that minimizes the return loss of the BAW filter 24 under specific frequency, power, and temperature combinations. For example, for each parameter combination, the impedance tuning module 12 is controlled to adjust the output voltage in 10mV steps (preset step size) within the range of 0-3.3V (preset voltage range). After each adjustment of the output voltage, the S11 parameter (a measure of return loss that reflects how much energy is reflected back when the RF signal encounters an impedance discontinuity during transmission; specifically, the smaller the value of the S11 parameter, the better the impedance matching of the BAW filter 24 and the higher the signal transmission efficiency) is measured. The output voltage corresponding to the minimum value of the S11 parameter is then used as the tuning voltage corresponding to that parameter combination. Step B1 is equivalent to using the existing golden section search algorithm to quickly find the optimal tuning voltage for each parameter combination. Step B2 focuses on optimizing the efficiency of power amplifier 22. Specifically, under each parameter combination, the bias voltage adjustment module 13 is controlled to adjust the bias voltage within its operating range. After each adjustment of the bias voltage, the efficiency of power amplifier 22 is measured, and the bias voltage at which the efficiency is highest is determined as the bias voltage for that parameter combination. Step B2 is equivalent to using a linear search to quickly find the optimal bias voltage for each parameter combination. Step B3 focuses on optimizing the matching of antenna 26. Specifically, for each parameter combination, the antenna tuning module 14 adjusts the tuning state of antenna tuning switch 25 one by one according to the multiple tuning states stored internally. After each adjustment of the tuning state, the return loss of antenna 26 is measured, and the tuning state with the lowest return loss is taken as the tuning state of antenna 26 for the current parameter combination. This ensures that the radio frequency signal can be efficiently transmitted from or received by antenna 26, reducing signal reflection loss. Step B4 integrates each parameter combination (frequency, power, temperature) and the optimal tuning voltage, bias voltage, and tuning state determined in steps B1, B2, and B3 into a complete mapping relationship. This mapping relationship is equivalent to the key data points for the system to achieve globally optimal performance under specific operating conditions. Finally, step B5 gathers all mapping relationships to form a comprehensive mapping table of combinations of frequency, power, and temperature and their corresponding combinations of tuning voltage, bias voltage, and tuning state. This mapping table serves as the basis for real-time tuning and control of the intelligent tuning RF system, ensuring that the intelligent tuning RF system can achieve accurate and efficient performance optimization under various complex operating conditions.

[0042] This embodiment addresses the shortcomings of traditional methods in constructing complex RF system mapping tables, such as insufficient accuracy, low efficiency, and inability to comprehensively cover optimal solutions for multiple operating conditions, through a systematic and multi-dimensional calibration and optimization process. Specifically, step B1 performs a fine-grained tuning voltage search for the impedance matching of the BAW filter 24, enabling the BAW filter 24 to achieve optimal return loss at different operating points, thereby maximizing signal transmission efficiency. Step B2 optimizes the bias voltage of the power amplifier 22 to ensure that the power amplifier 22 maintains maximum efficiency at different transmit powers and frequencies, effectively reducing the power consumption of the intelligent tuning RF system. Step B3 precisely selects the tuning state of the antenna tuning switch 25, ensuring optimal matching of the antenna 26 under various operating conditions and reducing signal reflection. These independent optimization steps are integrated into the mapping relationship of each parameter combination in step B4, ensuring that the system can simultaneously achieve optimal matching of the BAW filter 24, maximum efficiency of the power amplifier 22, and optimal matching of the antenna 26 at specific frequencies, power levels, and temperatures. Finally, step B5 integrates all these optimization results into a comprehensive mapping table, enabling the main control unit 1 of the intelligent tuning RF system to quickly and accurately find the corresponding optimal tuning voltage, bias voltage, and tuning state based on the real-time collected operating parameters and temperature information, thereby achieving hardware-level synchronization of state changes of each component in the RF link and optimal global performance across the entire link.

[0043] Therefore, this embodiment can construct a highly accurate and comprehensive mapping table of frequency, power, temperature, tuning voltage, bias voltage, and tuning state. This mapping table not only ensures optimal impedance matching of the BAW filter 24 under various operating conditions, but also optimizes the efficiency of the power amplifier 22 and the matching performance of the antenna 26. This enables the intelligent tuning RF system to achieve more precise dynamic tuning in actual operation and ensures the performance stability of the intelligent tuning RF system under all operating conditions, thereby achieving optimal global performance across the entire link from the power amplifier 22 to the antenna 26 port, and effectively improving the overall performance of the intelligent tuning RF system.

[0044] In some preferred embodiments, the state sensing unit 3 includes a temperature sensor 31 and a power detector 32. The radio frequency signal link 2 also includes a radio frequency transceiver 21. The temperature sensor 31 is mounted on the surface of the BAW filter 24 and is used to collect the temperature information of the BAW filter 24. The operating frequency of the radio frequency signal link 2 is output by the radio frequency transceiver 21. The power detector 32 is disposed between the power amplifier 22 and the adjustable impedance matching network 23 and is used to collect the transmission power of the radio frequency signal link 2. In this embodiment, the temperature sensor 31, power detector 32, and radio frequency transceiver 21 are preferably existing devices, and their working principles will not be discussed in detail here. In this embodiment, the radio frequency transceiver 21 is used to generate the baseband radio frequency signal to be transmitted based on preset parameters (including frequency). Therefore, this embodiment can utilize the operating frequency of the radio frequency signal link 2 output by the radio frequency transceiver 21.

[0045] In some preferred embodiments, the adjustable impedance matching network 23 adopts a π-type, T-type, or L-type topology. The π-type topology in this embodiment typically consists of two parallel reactance elements and one series reactance element, characterized by a wide impedance transformation range and good frequency response characteristics, suitable for scenarios requiring a large impedance matching range. The T-type topology in this embodiment typically consists of two series reactance elements and one parallel reactance element, offering advantages such as compact structure, ease of implementation, and high Q-value matching at specific frequencies. The L-type topology in this embodiment typically consists of one series reactance element and one parallel reactance element, suitable for situations with a small impedance transformation ratio, and features low loss and ease of design. Since those skilled in the art can choose which topology the adjustable impedance matching network 23 adopts according to actual needs, this embodiment enables the intelligent tuned RF system to flexibly select the topology of the adjustable impedance matching network 23 according to specific application scenarios and performance requirements. Therefore, this embodiment can effectively improve the design flexibility of the intelligent tuned RF system, so that the intelligent tuned RF system can better adapt to the impedance characteristics of different BAW filters 24 and RF signal links 2 and help optimize the performance of the adjustable impedance matching network 23.

[0046] In some preferred embodiments, the adjustable impedance matching network 23 includes an RF choke 234, an impedance matching inductor 233, a first DC blocking capacitor 231, a second DC blocking capacitor 232, a first varactor diode 235, and a second varactor diode 236. One end of the first DC blocking capacitor 231 is connected to the input terminal of the adjustable impedance matching network 23, and the other end of the first DC blocking capacitor 231 is connected to one end of the first varactor diode 235, one end of the RF choke 234, and one end of the impedance matching inductor 233, respectively. One end of the second varactor diode 236 is connected to one end of the RF choke 234, the other end of the impedance matching inductor 233, and one end of the second DC blocking capacitor 232, respectively. The other ends of the first varactor diode 235 and the second varactor diode 236 are both grounded. The other end of the second DC blocking capacitor 232 is connected to the output terminal of the adjustable impedance matching network 23, and the other end of the RF choke 234 is connected to the impedance tuning module 12.

[0047] The RF choke 234 in this embodiment is typically used to provide high impedance in RF circuits to prevent RF signals from flowing to DC power supplies or control lines, while allowing DC bias voltage to pass through. The impedance matching inductor 233, together with the first varactor diode 235 and the second varactor diode 236, forms a tunable resonant circuit. That is, this embodiment adjusts the network's impedance characteristics through the cooperation of the impedance matching inductor 233, the first varactor diode 235, and the second varactor diode 236. The first DC blocking capacitor 231 and the second DC blocking capacitor 232 in this embodiment are used to isolate DC voltage to prevent DC bias voltage from affecting the RF signal path, while allowing the RF signal to pass through. The first varactor diode 235 and the second varactor diode 236 in this embodiment are the core tuning elements of the adjustable impedance matching network 23; their capacitance values ​​change with the reverse bias voltage applied across them, thereby achieving dynamic adjustment of the network impedance.

[0048] This embodiment configures the RF choke 234, impedance matching inductor 233, first DC blocking capacitor 231, second DC blocking capacitor 232, first varactor diode 235, and second varactor diode 236 in a π-type topology, enabling the adjustable impedance matching network 23 to achieve a wide range of impedance transformation. Specifically, the target tuning voltage output by the impedance tuning module 12 is applied to the RF choke 234, which in turn provides bias voltages to the first varactor diode 235 and the second varactor diode 236. As the target tuning voltage changes, the capacitance values ​​of the first varactor diode 235 and the second varactor diode 236 change accordingly, thereby adjusting the equivalent impedance of the entire π-type network. This structure effectively matches the dynamic impedance changes of the BAW filter 24 under different operating frequencies, temperatures, and power levels, ensuring the power transmission efficiency of the RF signal link 2. In addition, the presence of the DC blocking capacitor ensures effective isolation between the DC bias voltage and the RF signal path, while the RF choke 234 ensures that the tuning voltage can be stably applied to the varactor diode without interfering with the transmission of the RF signal.

[0049] Therefore, the adjustable impedance matching network 23 in this embodiment adopts a π-type topology, which provides a wider impedance transformation range and more flexible tuning capability within a limited circuit area. Thus, the intelligent tuning RF system of this embodiment can effectively adapt to impedance changes of the BAW filter 24 under different operating conditions such as self-heating effects, ambient temperature changes, and frequency band switching, thereby maintaining excellent return loss and signal quality. Furthermore, the π-type topology facilitates the integration of tuning components such as varactor diodes and can directly interface with the voltage output of the impedance tuning module 12, effectively simplifying the circuit design and integration difficulty of the adjustable impedance matching network 23, thereby effectively improving the reliability of the adjustable impedance matching network 23.

[0050] In some preferred embodiments, the impedance tuning module 12 includes a digital-to-analog converter (DAC). The DAC's reference voltage source integrates a temperature compensation circuit for regulating and compensating the reference voltage source. In this embodiment, the DAC converts the target tuning voltage (digital form) output from the tuning processing module 11 into an analog voltage and outputs this analog voltage to control the adjustable impedance matching network 23. The reference voltage source in this embodiment is essential for the normal operation of the DAC. It provides a stable reference voltage to ensure that the DAC accurately converts the digital input into the corresponding analog output. The temperature compensation circuit in this embodiment can be understood as a circuit specifically designed to counteract the effects of temperature on the performance of electronic components. Its purpose is to maintain the constant output voltage of the reference voltage source when the ambient temperature changes. In practical applications, the temperature compensation circuit can be implemented in various ways. For example, it can be designed based on a bandgap reference voltage source, utilizing the characteristics of the positive and negative temperature coefficients of semiconductor devices to cancel each other out, thereby achieving voltage stability over a wide temperature range; or, a feedback control circuit combining a thermistor and an operational amplifier can be used to monitor the temperature in real time and adjust the output voltage to compensate for temperature drift. This embodiment integrates a temperature compensation circuit within the reference voltage source of the digital-to-analog converter (DAC), enabling the output voltage of the reference voltage source to remain highly stable under different temperature conditions. Specifically, when the ambient temperature or the internal temperature of the chip changes, the temperature compensation circuit senses these changes and automatically adjusts to offset the effect of temperature on the output voltage of the reference voltage source. Therefore, this embodiment ensures that the DAC always obtains an accurate and stable reference voltage, thereby guaranteeing the accuracy and stability of its output voltage. This voltage regulation and compensation mechanism ensures that the impedance tuning module 12 can continuously provide an accurate tuning voltage, thereby precisely controlling the impedance value of the adjustable impedance matching network 23. Through the above technical solution, the intelligent tuning RF system can effectively overcome the adverse effects of temperature changes on impedance tuning accuracy. Due to the temperature compensation of the reference voltage source, the output voltage stability of the impedance tuning module 12 is significantly improved, thereby ensuring that the adjustable impedance matching network 23 can achieve accurate impedance matching under various operating temperatures. This not only improves the performance stability of the BAW filter 24 and the entire RF signal link 2, but also enhances the robustness and reliability of the intelligent tuning RF system in complex environments, providing a key guarantee for the stable operation of the intelligent tuning RF system over a wide temperature range.

[0051] In some preferred embodiments, the intelligent tuning radio frequency system further includes a current sampling circuit and a protection circuit. The input terminal of the current sampling circuit is connected to the output terminal of the digital-to-analog converter, and the output terminal of the current sampling circuit is connected to the protection circuit. The current sampling circuit is used to collect the output current of the digital-to-analog converter, and the protection circuit is used to set the output of the digital-to-analog converter to a high-impedance state or turn off the output voltage of the digital-to-analog converter when the output current is greater than or equal to a preset output current.

[0052] The current sampling circuit in this embodiment can be understood as a module for real-time monitoring of the output current of a digital-to-analog converter (DAC). This embodiment can use the current sampling circuit to obtain the actual current value at the output terminal of the DAC, so that subsequent protection mechanisms can make judgments and responses based on this current value. In practical applications, the current sampling circuit can be implemented in various ways. For example, it can be a small-value sampling resistor connected in series in the output path of the DAC. In this embodiment, the current is indirectly calculated by measuring the voltage drop across the resistor. Alternatively, it can be an integrated Hall effect sensor or current transformer that directly senses and outputs a signal proportional to the current. The protection circuit of this embodiment can be understood as a module that can take measures to protect the digital-to-analog converter when an abnormal current is detected. This embodiment can use the protection circuit to prevent overcurrent from damaging the system. Specifically, when the output current detected by the current sampling circuit is greater than or equal to the preset output current, the protection circuit will be triggered. The protection circuit can take any of the following protection measures: 1. Set the output of the digital-to-analog converter to a high-impedance state, that is, disconnect the connection between the digital-to-analog converter and the load, so that its output terminal presents a high-impedance state, thereby preventing current flow; 2. Turn off the output voltage of the digital-to-analog converter, that is, directly cut off the power supply to the digital-to-analog converter or stop its output voltage, eliminating the risk of overcurrent at the source. The preset output current of this embodiment is a threshold determined according to the system design and component withstand capability, used to define the normal operating current and the overcurrent state.

[0053] This embodiment effectively solves the overcurrent problem that may occur at the output of the digital-to-analog converter (DAC) by introducing a current sampling circuit and a protection circuit. Specifically, the current sampling circuit is configured to continuously monitor the current from the DAC output to the adjustable impedance matching network 23. Once the protection circuit analyzes that the current rises due to an abnormal external load (e.g., a short circuit) and reaches or exceeds a preset output current threshold, the protection circuit will quickly respond and take corresponding protective measures. For example, it may put the DAC output into a high-impedance state, thereby cutting off the current path and preventing excessive current from flowing to the adjustable impedance matching network 23, thus avoiding thermal or electrical damage to the DAC itself and subsequent circuits; or it may directly shut off the DAC output voltage to fundamentally eliminate the overcurrent source, thereby ensuring the stability and safety of the entire intelligent tuning RF system. It is precisely because of this real-time monitoring and rapid response mechanism that the DAC can operate safely and reliably under various operating conditions. Through the above technical solution, this application significantly improves the reliability and robustness of the intelligent tuned RF system. Specifically, when an overcurrent occurs at the output of the digital-to-analog converter, the current sampling circuit can detect the abnormality in a timely manner and trigger the protection circuit to take effective measures. This not only effectively prevents the digital-to-analog converter from being damaged by overcurrent and extends its service life, but also avoids the overcurrent from causing cascading damage to other sensitive components in the RF signal link 2. Compared with existing solutions that lack such protection mechanisms, this embodiment can ensure that the intelligent tuned RF system can still maintain stable operation when facing external abnormal loads or faults, thereby greatly reducing the system failure rate and maintenance costs, and thus ensuring the long-term reliable operation of the intelligent tuned RF system in complex electromagnetic environments.

[0054] As can be seen from the above, the intelligent tuning RF system provided in this application eliminates the need for an external dedicated tuning chip and its peripheral circuits by integrating the module for adjusting the impedance of the BAW filter 24 into the main control unit 1. That is, this application achieves dynamic tuning function without increasing the size, thus realizing a high degree of integration of the intelligent tuning RF system. Since this application does not require a dedicated tuning chip and related peripheral components, it can effectively reduce the bill of materials cost of the intelligent tuning RF system and effectively simplify the PCB layout complexity and system calibration process, thereby effectively reducing the production cost and overall system cost of the intelligent tuning RF system. Furthermore, since the tuning function of this application shares the computing and power resources of the main control IC, its own added static and dynamic power consumption is negligible. Therefore, this application can effectively reduce the power consumption of the intelligent tuning RF system, thereby effectively reducing the pressure on device battery life.

[0055] In the embodiments provided in this application, it should be understood that relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0056] The above are merely embodiments of this application and are not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A smart tuning radio frequency system, characterized in that, The intelligent tuning radio frequency system includes: The main control unit integrates a tuning processing module and an impedance tuning module. A radio frequency signal link, comprising an adjustable impedance matching network and a BAW filter, wherein the adjustable impedance matching network is connected to the impedance tuning module and the BAW filter; A state sensing unit, connected to the radio frequency signal link, is used to collect the operating parameters of the radio frequency signal link and the temperature information of the BAW filter; The tuning processing module is used to obtain the target tuning voltage based on the operating parameters, the temperature information, and the pre-built conversion relationship; The impedance tuning module is used to adjust its output voltage according to the target tuning voltage, so as to adjust the impedance value of the adjustable impedance matching network.

2. The intelligent tuning radio frequency system according to claim 1, characterized in that, The operating parameters include operating frequency and transmission power.

3. The intelligent tuning radio frequency system according to claim 2, characterized in that, The main control unit also integrates an antenna tuning module and a bias voltage adjustment module. The RF signal link further includes a power amplifier and an antenna tuning switch. The input terminal of the power amplifier is connected to the bias voltage adjustment module, and the output terminal of the power amplifier is connected to the adjustable impedance matching network. The antenna tuning switch is connected to the BAW filter and the antenna tuning module. The tuning processing module is also used to obtain the target bias voltage and the target tuning state according to the operating parameters, the temperature information, and the pre-built conversion relationship. The antenna tuning module is used to adjust the tuning state of the antenna tuning switch according to the target tuning state, and the bias voltage adjustment module is used to adjust the bias voltage of the power amplifier according to the target bias voltage.

4. The intelligent tuning radio frequency system according to claim 3, characterized in that, The pre-built conversion relationship is a mapping table of combinations of frequency, power, and temperature and their corresponding combinations of tuning voltage, bias voltage, and tuning state. The process by which the tuning processing module obtains the target tuning voltage, target bias voltage, and target tuning state based on the operating parameters, the temperature information, and the pre-built conversion relationship includes: A1. Based on the operating frequency, the transmission power, and the temperature information, extract the corresponding tuning voltage as the target tuning voltage from the mapping table of combinations of frequency, power, and temperature and their corresponding combinations of tuning voltage, bias voltage, and tuning state. Extract the corresponding bias voltage as the target bias voltage and the corresponding tuning state as the target tuning state.

5. The intelligent tuning radio frequency system according to claim 4, characterized in that, The antenna tuning switch is connected to the antenna. The pre-construction process of the mapping table of combinations of frequency, power, and temperature and their corresponding combinations of tuning voltage, bias voltage, and tuning state includes: B1. For each parameter combination in the parameter combination set, control the impedance tuning module to adjust its output voltage within a preset range with a preset step size, and take the output voltage of the BAW filter when the return loss is minimized as the tuning voltage corresponding to that parameter combination; the parameter combination includes frequency, power and temperature, and the frequency, power and temperature combinations corresponding to all parameter combinations are different. B2. For each of the parameter combinations, control the bias voltage adjustment module to adjust the bias voltage within its operating range, and take the bias voltage corresponding to the highest efficiency of the power amplifier as the bias voltage corresponding to that parameter combination. B3. For each of the parameter combinations, control the antenna tuning module to adjust the tuning state of the antenna tuning switch according to all the tuning states it stores, and take the tuning state with the minimum return loss of the antenna as the adjustment state corresponding to the parameter combination. B4. For each of the parameter combinations, integrate the parameter combination and its corresponding tuning voltage, bias voltage and tuning state into a mapping relationship between the combination of frequency, power and temperature and its corresponding combination of tuning voltage, bias voltage and tuning state. B5. Integrate all the mapping relationships between the combinations of frequency, power, and temperature and their corresponding combinations of tuning voltage, bias voltage, and tuning state into a mapping relationship table for the combinations of frequency, power, and temperature and their corresponding combinations of tuning voltage, bias voltage, and tuning state.

6. The intelligent tuning radio frequency system according to claim 3, characterized in that, The state sensing unit includes a temperature sensor and a power detector. The radio frequency signal link also includes a radio frequency transceiver. The temperature sensor is mounted on the surface of the BAW filter and is used to collect the temperature information of the BAW filter. The operating frequency of the radio frequency signal link is output by the radio frequency transceiver. The power detector is located between the power amplifier and the adjustable impedance matching network and is used to collect the transmit power of the radio frequency signal link.

7. The intelligent tuning radio frequency system according to claim 1, characterized in that, The adjustable impedance matching network adopts a π-type topology, a T-type topology, or an L-type topology.

8. The intelligent tuning radio frequency system according to claim 7, characterized in that, The adjustable impedance matching network includes an RF choke, an impedance matching inductor, a first DC blocking capacitor, a second DC blocking capacitor, a first varactor diode, and a second varactor diode. One end of the first DC blocking capacitor is connected to the input terminal of the adjustable impedance matching network. The other end of the first DC blocking capacitor is connected to one end of the first varactor diode, one end of the RF choke, and one end of the impedance matching inductor, respectively. One end of the second varactor diode is connected to one end of the RF choke, the other end of the impedance matching inductor, and one end of the second DC blocking capacitor, respectively. The other ends of the first and second varactor diodes are both grounded. The other end of the second DC blocking capacitor is connected to the output terminal of the adjustable impedance matching network. The other end of the RF choke is connected to the impedance tuning module.

9. The intelligent tuning radio frequency system according to claim 1, characterized in that, The impedance tuning module includes a digital-to-analog converter, and the reference voltage source of the digital-to-analog converter integrates a temperature compensation circuit, which is used to perform voltage regulation and compensation on the reference voltage source.

10. The intelligent tuning radio frequency system according to claim 9, characterized in that, The intelligent tuning radio frequency system further includes a current sampling circuit and a protection circuit. The input terminal of the current sampling circuit is connected to the output terminal of the digital-to-analog converter, and the output terminal of the current sampling circuit is connected to the protection circuit. The current sampling circuit is used to collect the output current of the digital-to-analog converter, and the protection circuit is used to set the output of the digital-to-analog converter to a high-impedance state or turn off the output voltage of the digital-to-analog converter when the output current is greater than or equal to a preset output current.

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