Radio frequency system, wireless communication equipment and power amplifier protection method

Abstract

A protection method for a radio frequency system, a wireless communication device, and a power amplifier is provided. The radio frequency system includes: a radio frequency path for transmitting a radio frequency signal in a first frequency band; a power amplifier located on the radio frequency path for performing power amplification processing on the radio frequency signal; and a control module for controlling the input power of the power amplifier so that the input power of the power amplifier is less than the maximum allowable input power of the power amplifier. In an embodiment of the present application, the input power of the power amplifier is controlled to be lower than the maximum allowable input power of the power amplifier, so as to protect the PA from burning out and improve the reliability of the PA to a certain extent.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of wireless communication technology, and more specifically, to a protection method for a radio frequency system, a wireless communication device, and a power amplifier. Background Art

[0002] With the widespread application of communication technology, wireless communication equipment is increasingly being used. In wireless communication equipment, wireless communication is generally achieved through radio frequency circuits. Power amplifiers (PAs) are important components in radio frequency circuits, and radio frequency circuits usually amplify the power of radio frequency signals through power amplifiers. However, power amplifiers are prone to burnout during use, resulting in reliability issues. Summary of the invention

[0003] The embodiments of the present application provide a protection method for a radio frequency system, a wireless communication device, and a power amplifier.

[0004] In a first aspect, a radio frequency system is provided, comprising: a radio frequency path for transmitting a radio frequency signal in a first frequency band; a power amplifier, located on the radio frequency path, for performing power amplification processing on the radio frequency signal; and a control module, for controlling the input power of the power amplifier so that the input power of the power amplifier is less than the maximum allowable input power of the power amplifier.

[0005] In a second aspect, a wireless communication device is provided, comprising: a baseband system for generating a baseband signal; and a radio frequency system as described in the first aspect, for generating a radio frequency signal according to the baseband signal.

[0006] In a third aspect, a method for protecting a power amplifier is provided, wherein the RF system comprises: an RF path for transmitting an RF signal in a first frequency band; a power amplifier located on the RF path for performing power amplification processing on the RF signal; and a control module for controlling the input power of the power amplifier; the method comprises: controlling the input power of the power amplifier to be less than the maximum allowable input power of the power amplifier.

[0007] According to a fourth aspect, a computer-readable storage medium is provided, wherein the computer storage medium stores a computer program, and when the computer program is executed, the method according to the third aspect is implemented.

[0008] In the embodiment of the present application, the input power of the power amplifier is controlled to be lower than the maximum allowable input power of the power amplifier according to the maximum allowable input power of the power amplifier. When the input power of the power amplifier is reduced, the operating current of the internal triode of the PA is reduced, and the operating current is less than the maximum allowable operating current of the triode device or the wiring, so that the current breakdown phenomenon will not be caused, and the PA will not be burned, thereby improving the reliability of the PA to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of a radio frequency system provided by the related technology.

[0010] Figure 2 It is a schematic diagram of the relationship between voltage and current in a triode provided by the relevant technology.

[0011] Figure 3 It is a schematic diagram of a radio frequency system provided in an embodiment of the present application.

[0012] Figure 4 It is a structural diagram of a wireless communication device provided in an embodiment of the present application.

[0013] Figure 5 It is a flowchart of a protection method provided in an embodiment of the present application.

[0014] Figure 6 It is a flowchart of another protection method provided in an embodiment of the present application.

[0015] Figure 7 It is a flowchart of another protection method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0017] In recent years, with the development of communication technology, the application of wireless communication equipment has become more and more extensive, and wireless communication equipment has been continuously updated and iterated. It should be noted that the wireless communication equipment mentioned in the embodiment of the present application may refer to any type of electronic device with wireless communication function. The wireless communication device mentioned in the embodiment of the present application may be a device that provides voice and / or data connectivity to the user, which can be used to connect people, objects and machines, such as handheld devices and vehicle-mounted devices with wireless connection functions. The wireless communication device in the embodiment of the present application may be, for example, a mobile phone, a tablet computer (Pad), a laptop computer, a PDA, a mobile Internet device (mobile internet device, MID), a wearable device, a virtual reality (virtual reality, VR) device, an augmented reality (augmented reality, AR) device, a wireless terminal in industrial control (industrial control), a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (transportation safety), a wireless terminal in a smart city (smart city), a wireless terminal in a smart home (smart home), etc.

[0018] Wireless communication devices generally include a baseband system and a radio frequency system. The baseband system is used to generate a baseband signal, and the radio frequency system is used to convert the baseband signal into a radio frequency signal, so as to transmit the radio frequency signal to a wireless radio frequency channel through an antenna.

[0019] The RF system may include an RF transceiver and an RF path. The RF transceiver may transmit the RF signal to the power amplifier of the RF path. After the RF signal is amplified by the power amplifier, it can reach the desired transmit power and then be transmitted outward through the antenna. The power amplifier may adjust the transmit power of the RF signal according to actual needs, thereby meeting the transmit power requirements of different scenarios.

[0020] The power amplifier is an important component of the RF path. The normal operation of the power amplifier is of great significance to wireless communication equipment. At present, in order to ensure the stability of the power supply to the power amplifier, the relevant technology usually uses a special RF power supply to power the power amplifier. The RF power supply can be integrated on a chip to form a radio frequency (RF) power supply chip. For different transmission powers, the power supply voltage required by the power amplifier is different. In other words, the power amplifier has requirements for the voltage range of the power supply voltage provided by the RF power supply. For example, the voltage range of the power supply voltage provided by the RF power supply to the power amplifier can be 0.7V-5V. The RF power supply can adjust the power supply voltage of the power amplifier within the voltage range according to the currently required transmission power.

[0021] Figure 1 It is a schematic diagram of a radio frequency system provided by the related technology. Figure 1 As shown, the radio frequency system includes: a radio frequency transceiver 110, a radio frequency path 120, etc.

[0022] The RF transceiver 110 has an output port connected to the RF path 120. The RF transceiver 110 can control the transmission frequency of the signal and adjust the transmission power of the signal.

[0023] The RF path 120 may include a power amplifier 121, a power supply 122, a filter 123, an antenna 124, etc. The power amplifier 121 is used to amplify the power of the transmitted signal, and then the signal is transmitted outward through the antenna. The power supply 122 can adjust the power supply voltage of the power amplifier within a certain range according to the currently required transmission power. The filter 123 is used to filter out interference signals on the RF path 120. The antenna 124 is used to transmit and receive RF signals.

[0024] Different scenarios have different requirements for the antenna's transmit power. Usually, the RF transceiver detects the output power of the power amplifier output through a feedback loop, and determines the corresponding transmit power of the RF transceiver based on the return loss ratio (also called reflection loss). Return loss is the ratio of the incident power to the reflected power of the RF circuit, and it looks at the mismatch between input and output from a power perspective. For example, if 1mW (0dBm) of power is input to the antenna, and 10% of it is reflected (bounced) back, the return loss is 10dB. When the parameters such as the component impedance of the RF circuit, the antenna efficiency, and the radiation field shape of the antenna are determined, the return loss of the RF circuit is also fixed.

[0025] During use, the power amplifier is prone to burnout, affecting the reliability of the RF path. Figure 1As shown, when a hardware anomaly occurs in the back stage of the PA link, such as damage to the filter 123 or the antenna 124 switch, or the link insertion loss increases, causing the transmission power of the antenna 124 to be unable to increase, the controller will be triggered to increase the PA input power to ensure the PA output power. In fact, the PA is in a fixed gain, and when the PA input power increases, the PA output power will also increase accordingly. If the front-end link is disconnected, the RF transceiver will increase the PA input power to the maximum, and the PA output power will also increase to the maximum. As a result, the PA becomes saturated. If it is in this state for a long time, the PA is easily burned out, resulting in reliability problems.

[0026] After analysis, it was found that PA burning is mainly caused by two reasons: one is the voltage breakdown of the PA's internal transistors, and the other is the current breakdown of the PA's internal transistors.

[0027] like Figure 2 As shown in the figure, when the input VCC voltage of the PA exceeds the collector-emitter reverse breakdown voltage (i.e. BV CEO ), the transistor undergoes avalanche breakdown. Among them, BV CEO is the collector-emitter reverse breakdown voltage, BV CBO is the collector-base reverse breakdown voltage, BV CEO <BV CBO .

[0028] The main reason for current breakdown is that the PA output power is too large, the current flow capacity of the device in the current path of the PA internal transistor is insufficient, the operating current exceeds the maximum current flow capacity of the device or circuit, and appears in the area with the largest current swing, thus causing current breakdown.

[0029] Therefore, in order to ensure the normal operation of the RF path and improve the reliability of the PA, it is an urgent problem to develop a solution to protect the PA from burning out.

[0030] In view of the above problems, an embodiment of the present application proposes a radio frequency system, and the embodiment of the present application is described in detail below.

[0031] Figure 3 Schematic diagram of a radio frequency system provided in an embodiment of the present application. Figure 3 As shown, the radio frequency system includes: a radio frequency transceiver 210, a radio frequency path 220, a control circuit 230, etc.

[0032] The RF transceiver 210 has an output terminal connected to the RF path 220. The RF transceiver 210 can control the transmission frequency of the signal and adjust the transmission power of the signal.

[0033] The RF path 220 is connected to the output end of the RF transceiver 210 and may include a power amplifier 221 , a power supply 222 , a filter 223 , an antenna 224 and the like.

[0034] The power amplifier 221 has a first input terminal and a second input terminal. The first input terminal is connected to the output terminal of the RF transceiver 210 and is used to receive the output power of the RF transceiver. The second input terminal is connected to the power supply 222 and is used to receive an input voltage. The power amplifier 221 is used to adjust the power of the amplified transmission signal. The power amplifier 221 can adjust the transmission power of the RF signal according to actual needs to meet different requirements for transmission power in different scenarios.

[0035] The power supply 222 can adjust the supply voltage of the power amplifier according to the currently required transmission power.

[0036] The filter 223 is used to filter out interference signals on the RF path 220 .

[0037] Antenna 224 is used for transmitting and receiving radio frequency signals.

[0038] The control circuit 230 is connected to the RF transceiver 210. The control circuit 230 ensures that the PA input power is within a certain range and controls the input power of the power amplifier to be lower than the maximum allowable input power of the power amplifier. If a hardware abnormality occurs in the front end or the link is disconnected, resulting in the transmission power of the antenna 224 not being able to increase, the controller will be triggered to increase the PA input power to ensure the PA output power. When the PA input power increases, the PA output power will also increase accordingly. If the RF transceiver increases the PA input power to the maximum allowable input power, the PA output power will not increase after reaching the maximum. This ensures that the PA output power is within a certain range, ensuring that the PA is within a reliable range under any circumstances and will not burn out.

[0039] In some implementations, the power can be controlled to make the input power lower than the maximum allowable input power of the power amplifier. In some implementations, relative gain index (RGI) can also be used to correspond to different powers to make the input power lower than the maximum allowable input power of the power amplifier. For example, RGI can be used to correspond to different input powers through feedback receive loop (FBRX), average power tracking (APT) technology or envelope tracking (ET) technology. Optionally, the components of the input power can also be controlled, such as the input voltage. The input voltage can be controlled to make the input voltage lower than the maximum allowable input voltage of the power amplifier, thereby making the input power lower than the maximum allowable input power of the power amplifier.

[0040] In some implementations using RGI control, the maximum input power of the corresponding PA is first confirmed, which can be obtained from the specification and other materials. Then, the relationship between the output power of the RF transceiver output and the RGI is measured. The output power of the transceiver output is the input power of the PA input, and the maximum RGI that needs to be limited to calibrate the maximum input power of the PA is found.

[0041] PA can work in different frequency bands. In different working frequency bands, the corresponding maximum input power of PA may be different. For different working frequency bands of PA, first confirm the maximum input power of PA in the corresponding working frequency band, then measure the relationship between the output power of RF transceiver in different working frequency bands and the corresponding RGI, and find out the maximum RGI that needs to be calibrated to limit the maximum input power of PA in different working frequency bands.

[0042] The mapping relationship between the calibrated output power of the RF transceiver in different operating frequency bands and the corresponding RGI can be stored in the memory of the terminal device or in the cloud server. In the memory of the terminal device, in some implementations, it can be stored in an internal memory such as a random access memory (RAM) to limit the calibrated PA input power. For example, a feedback receiving loop, an average power tracking technology, or an envelope tracking technology can call the mapping relationship between the output power of the RF transceiver in different operating frequency bands and the corresponding RGI stored in the RAM to limit the calibrated PA input power. Optionally, it can also be stored in a nonvolatile memory (NVM) to limit the input power of the PA.

[0043] The main function of RAM is to store code and data for the controller to call when needed. The contents of RAM storage cells can be taken out or stored as needed, and the access speed is independent of the location of the storage cell. However, this type of memory will lose its storage content when the power is off.

[0044] The control circuit 230 controls the RGI output by the RF transceiver to be lower than the RGI corresponding to the maximum allowable input power of the power amplifier according to the relationship between the calibrated output power of the RF transceiver in different working frequency bands and the corresponding RGI. In this way, the output power of the RF transceiver can be limited to be lower than the maximum allowable input power of the power amplifier, thereby ensuring that the input power of the power amplifier is within the allowable range of normal operation and ensuring that the PA will not burn out.

[0045] In some implementations, the input power of the PA can be controlled by the RGI of a feedback receiving loop connected to the RF transceiver. The feedback receiving loop can detect power parameters, phase parameters, etc. of a signal at the output end of the power amplifier. The feedback receiving loop controls the RGI of the RF transceiver in different working frequency bands according to the pre-stored calibrated relationship between the output power of the RF transceiver in different working frequency bands and the corresponding RGI, so that the output power corresponding to the RGI is lower than the maximum allowable input power of the PA.

[0046] Combine the following Figure 3 The working process of a radio frequency system for limiting the calibrated PA input power based on the FBRX method in an embodiment of the present application is exemplarily introduced, which is mainly divided into the following two steps:

[0047] Step 1: First confirm the maximum allowable input power of the PA in different operating frequency bands.

[0048] Step 2: Then measure the relationship between the output power of the RF transceiver in different working frequency bands and the corresponding RGI. The output power of the RF transceiver is the input power of the PA, and find out the maximum RGI that needs to be limited for the maximum allowable input power of the calibrated PA in different working frequency bands. The corresponding relationship between the RGI and the output power of the RF transceiver in the long term evolution (LTE) intermediate frequency band is obtained as shown in Table 1.

[0049] Table 1 shows the correspondence between the RGI and the output power of the RF transceiver in some LTE intermediate frequency bands. As shown in Table 1, the correspondence between the RGI and the output power of the RF transceiver in the B1 band in LTE, if the maximum allowable input power of the PA is 6dBm, the corresponding RGI is 69, then the maximum RGI value set in the calibration parameters is not allowed to exceed 69.

[0050] Table 1

[0051]

[0052] The relationship between the output power of the RF transceiver and the corresponding RGI in different working frequency bands is measured to obtain the corresponding relationship between the RGI of the LTE B1 band and the output power of the RF transceiver as shown in Table 2. Only part of the data is shown schematically. It is used for the control of subsequent steps. Table 2 is part of the data of the corresponding relationship between the RGI of the LTE B1 band and the output power of the RF transceiver.

[0053] Table 2

[0054] RGI 1 2 3 4 5 6 7 8 9 10 11 PWR(dB) -160 -155 -143 -133 -123 -112 -102 -92 -83 -73 -67 RGI 12 13 14 15 16 17 18 19 20 21 22 PWR(dB) -55 -46 -35 -24 -13 -3 8 19 30 40 51 RGI 23 24 25 26 27 28 29 30 31 32 33 PWR(dB) 61 73 84 95 108 119 132 143 155 166 177

[0055] Step 3: According to the relationship between the calibrated output power of the RF transceiver in different working frequency bands and the corresponding RGI, the RGI at the output end of the RF transceiver is controlled to be lower than the maximum RGI corresponding to the maximum allowable input power of the power amplifier.

[0056] According to the relationship between the calibrated output power of the RF transceiver in different working frequency bands and the corresponding RGI (as shown in Table 2), and the maximum RGI value of 69, the RGI at the output end of the RF transceiver is controlled to be lower than 69. In this way, the output power of the RF transceiver can be limited to be lower than the maximum allowable input power of the power amplifier, thereby ensuring that the input power of the power amplifier is within the allowable range of normal operation.

[0057] In some implementations, the input power of the PA can be controlled by scanning the RGI through the average power tracking technology, so that the RGI scanned by the APT technology is not allowed to exceed the maximum RGI. APT is also called adaptive voltage regulation, which is a technology that automatically adjusts the operating voltage of the PA based on the PA's pre-output power and the PA's own parameters.

[0058] In some implementations, the input power of the PA can also be controlled by scanning the RGI through the ET technology, so that the RGI scanned by the ET technology is not allowed to exceed the maximum RGI. As mentioned above, the maximum allowable input power added to the PA is 6dBm, which can limit the output power of the RF transceiver to within 6dBm, thereby ensuring that the input power of the PA does not exceed 6dBm. The basic working principle of ET is: the RF processing unit and the baseband processing unit calculate the envelope signal (Envelop signal) according to the RF signal, power level and the characteristic parameters of the power amplifier itself. At the same time, the differential analog-to-digital converter in the RF and baseband units will provide an analog reference signal. The power supply of ET will amplify the envelope signal and then send it to the PA. At the same time, the PA will amplify the RF signal so that the RF signal and the working voltage of the PA follow each other. Finally, the PA sends the amplified signal to the duplexer, and the duplexer will attenuate the signal outside the bandwidth and highlight the useful signal. ET establishes a connection between the working voltage of the PA and the input RF signal so that they follow each other in real time, thereby improving the working efficiency of the PA.

[0059] When the controller power is turned off or the controller power is turned off suddenly or unexpectedly, the data in the controller's internal memory is prone to loss. In some implementations, the data can be stored in nonvolatile memory (NVM) to limit the input power of the PA. Nonvolatile memory means that when the computer is turned off or the computer is turned off suddenly or unexpectedly, the data in it will not be lost, just like external memory such as a hard disk. For example, read-only memory (ROM) and flash memory (FM).

[0060] Table 3 shows the RGI values ​​corresponding to the maximum allowable output power of RF transceivers in different communication standard frequency bands. Figure 3 , an exemplary description is given of the working process of a radio frequency system that limits the PA input power based on a non-volatile memory, which is mainly divided into the following three steps:

[0061] Step 1: First confirm the maximum allowable input power of the PA in different operating frequency bands.

[0062] Table 3

[0063] Communication standard LTE LTE LTE LTE LTE LTE WCDMA WCDMA WCDMA Frequency band 1 2 3 4 34 39 2 1 5 RGI 67 67 65 64 64 63 55 53 50

[0064] Step 2: Then measure the relationship between the output power of the RF transceiver in different working frequency bands and the corresponding RGI, and find out the maximum RGI that needs to be limited for the maximum allowable input power of the calibrated PA in different working frequency bands. The corresponding relationship between the output power and RGI of the approved RF transceiver in different working frequency bands is obtained and stored in the non-volatile memory.

[0065] Step 3: According to the relationship between the calibrated output power of the RF transceiver in different working frequency bands and the corresponding RGI, as well as the maximum RGI value, the RGI at the output of the RF transceiver is controlled to be lower than the maximum RGI corresponding to the maximum allowable input power of the power amplifier. In this way, the output power of the RF transceiver can be limited to be lower than the maximum allowable input power of the power amplifier, thereby ensuring that the input power of the power amplifier is within the allowable range of normal operation.

[0066] In some implementations, the FBRX, APT or ET technology may be used alone to limit the calibrated RGI to be lower than the PA input power, or the NVM storage RGI method may be used alone to limit the PA input power. In some implementations, one of the FBRX, APT or ET technologies may be used to limit the calibrated RGI to be lower than the PA input power, and the NVM storage RGI method may be used in combination to limit the PA input power.

[0067] The present application also provides a wireless communication device, Figure 4 is a schematic structural diagram of a wireless communication device provided in an embodiment of the present application. Figure 4 As shown, the wireless communication device 400 may include a baseband system 410 and a radio frequency system 420. The baseband system 410 may be used to generate a baseband signal. The radio frequency system 420 may be used to generate a radio frequency signal according to the baseband signal generated by the baseband system 410. The radio frequency system 420 may adopt the radio frequency system described in any of the above embodiments.

[0068] Combination of the above Figures 1 to 4, describes in detail the device embodiment of the present application. Figures 5 to 7 , the method embodiment of the present application is described in detail. It should be understood that the description of the method embodiment corresponds to the description of the device embodiment, so the parts not described in detail can refer to the previous device embodiment.

[0069] Figure 5 It is a schematic flow chart of a protection method provided in an embodiment of the present application. Figure 5 The method can be applied to the radio frequency system mentioned in any of the above embodiments.

[0070] The radio frequency system comprises: a radio frequency path for transmitting radio frequency signals in a first frequency band; a power amplifier located on the radio frequency path for performing power amplification processing on the radio frequency signals; and a control module for controlling the input power of the power amplifier.

[0071] Figure 5 The method may include step S510 and step S520, and these steps are described in detail with examples below.

[0072] In step S510, the maximum allowable input power of the PA in different operating frequency bands is confirmed.

[0073] In step S520, the input power of the PA is limited to be lower than the maximum input power of the current operating frequency band of the PA.

[0074] In some implementations, the output power of the RF transceiver in different operating frequency bands can be measured. The output power of the RF transceiver is the input power of the PA, and the output power of the RF transceiver is controlled to be lower than the maximum input power of the current operating frequency band of the PA. In some implementations, relative gain indication can also be used to correspond to different powers so that the input power is lower than the maximum allowable input power of the power amplifier. For example, RGI can be used to correspond to different input powers through FBRX, APT technology or ET technology. Optionally, the components of the input power can also be controlled, such as the input voltage. The input voltage can be controlled to make the input voltage lower than the maximum allowable input voltage of the power amplifier, thereby making the input power lower than the maximum allowable input power of the power amplifier.

[0075] exist Figure 5 In some implementations of the exemplary method, the FBRX, APT or ET technology may be used alone to limit the calibrated RGI to be lower than the PA input power, or the NVM storage RGI method may be used alone to limit the PA input power. In some implementations, any one of the FBRX, APT or ET technology may be used to limit the calibrated RGI to be lower than the PA input power, and the NVM storage RGI method may be used to limit the PA input power.

[0076] Figure 6 FIG. 1 is a schematic flow chart of another protection method provided in an embodiment of the present application, which is based on the control method of FBRX. Figure 6 As shown, the method includes steps S610 to S630.

[0077] In step S610, the maximum allowable input power of the PA in different operating frequency bands is confirmed.

[0078] In step S620, the relationship between the output power of the RF transceiver in different working frequency bands and the corresponding RGI is measured. The output power of the RF transceiver is the input power of the PA, and the maximum RGI that needs to be limited to the maximum allowable input power of the calibrated PA in different working frequency bands is found.

[0079] In step S630, according to the relationship between the calibrated output power of the RF transceiver in different working frequency bands and the RGI of the corresponding FBRX, the RGI of the RF transceiver output end is controlled to be lower than the maximum RGI corresponding to the maximum allowable input power of the power amplifier in the current working frequency band.

[0080] exist Figure 6 In some implementations of the protection method of the embodiment, the input power of the PA may also be controlled by scanning the RGI using the APT technology, so that the RGI scanned by the APT technology is not allowed to exceed the maximum RGI corresponding to the maximum allowable input power of the current operating frequency band of the power amplifier.

[0081] exist Figure 6 In some implementations of the protection method of the embodiment, the input power of the PA may also be controlled by scanning the RGI through the ET technology, so that the RGI scanned by the ET technology is not allowed to exceed the maximum RGI corresponding to the maximum allowable input power of the current operating frequency band of the power amplifier.

[0082] Figure 7 FIG. 1 is a schematic flow chart of another protection method provided in an embodiment of the present application, which is a control method based on NVM storage. Figure 7 As shown, the method includes steps S710 to S730.

[0083] In step S710, the maximum allowable input power of the PA in different operating frequency bands is determined.

[0084] In step S720, the relationship between the output power of the RF transceiver in different working frequency bands and the corresponding RGI is measured. The output power of the RF transceiver is the input power of the PA, and the maximum RGI that needs to be limited by the maximum allowable input power of the calibrated PA in different working frequency bands is found. The mapping relationship between the output power of the calibrated RF transceiver in different working frequency bands and the corresponding RGI is stored in a non-volatile memory.

[0085] In step S730, according to the relationship between the output power of the calibrated RF transceiver in different working frequency bands and the corresponding RGI stored in the non-volatile memory, the RGI at the output end of the RF transceiver is controlled to be lower than the maximum RGI corresponding to the maximum allowable input power of the power amplifier in the current working frequency band.

[0086] An embodiment of the present application further provides a computer-readable storage medium, which stores a computer program. When the computer program is executed, the aforementioned method steps are implemented.

[0087] The embodiment of the present application controls the input power of the power amplifier to be lower than the maximum allowable input power of the power amplifier according to the calibrated maximum allowable input power of the power amplifier. When the input power of the power amplifier is reduced, the operating current of the triode inside the PA is reduced, and the operating current is less than the maximum allowable operating current of the triode device or the wiring, so that the current breakdown phenomenon will not be caused, and the PA will not be burned, thereby improving the reliability of the PA to a certain extent.

[0088] It should be understood that in the various embodiments of the present application, "first", "second", etc. are used to distinguish different objects rather than to describe a specific order. The size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0089] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0090] In all embodiments provided in the present application, it should be understood that when a part is said to be "connected" or "connected" to another part, it means that the part can be not only "directly connected" but also "electrically connected" with another element intervening therebetween. In addition, the term "connected" also means that the part is "physically connected" and "wirelessly connected". In addition, when a part is said to "include" a certain element, unless otherwise stated, it means that the part can include another element, rather than excluding the other element.

[0091] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0092] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0093] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented by software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from one website site, computer, server or data center to another website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode. The computer-readable storage medium may be any available medium that can be read by a computer or a data storage device such as a server or data center that includes one or more available media integrated. The available medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a digital versatile optical disk) or a semiconductor medium (e.g., a solid-state hard disk), etc.

[0094] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A radio frequency system, characterized in that: include: A radio frequency path, used for transmitting a radio frequency signal in a first frequency band; A power amplifier, located on the radio frequency path, for performing power amplification processing on the radio frequency signal; A control module, used for controlling the input power of the power amplifier so that the input power of the power amplifier is less than the maximum allowable input power of the power amplifier; The controlling the input power of the power amplifier so that the input power of the power amplifier is less than the maximum allowable input power of the power amplifier includes: confirming the maximum allowable input power of the power amplifier in different operating frequency bands, the first frequency band being any operating frequency band among the different operating frequency bands; If a rear-stage link of the power amplifier is disconnected or the rear-stage hardware of the power amplifier is abnormal, controlling the relative gain index of the first frequency band so that the relative gain index of the first frequency band is less than a target relative gain index, wherein the target relative gain index is the relative gain index corresponding to the maximum allowable input power; The controlling the relative gain index of the first frequency band comprises: The relative gain index of the first frequency band is calibrated by using one or more of a feedback receiving loop FBRX, an average power tracking APT, and an envelope tracking ET, so that the relative gain index of the first frequency band is less than the target relative gain index.

2. The radio frequency system according to claim 1, characterized in that: The controlling the relative gain index of the first frequency band comprises: The relative gain index of the first frequency band is controlled so that the relative gain index of the first frequency band is smaller than the target relative gain index recorded in the memory.

3. A wireless communication device, characterized in that: include: A baseband system, for generating a baseband signal; The radio frequency system according to any one of claims 1 to 2, configured to generate a radio frequency signal according to the baseband signal.

4. A method for protecting a power amplifier, characterized in that: Applied to a radio frequency system, the radio frequency system comprising: A radio frequency path, used for transmitting a radio frequency signal in a first frequency band; A power amplifier, located on the radio frequency path, for performing power amplification processing on the radio frequency signal; A control module, used for controlling the input power of the power amplifier so that the input power of the power amplifier is less than the maximum allowable input power of the power amplifier; The method comprises: According to the maximum allowable input power of the power amplifier, controlling the input power of the power amplifier to be less than the maximum allowable input power of the power amplifier; The controlling the input power of the power amplifier so that the input power of the power amplifier is less than the maximum allowable input power of the power amplifier includes: confirming the maximum allowable input power of the power amplifier in different operating frequency bands, the first frequency band being any operating frequency band among the different operating frequency bands; If a rear-stage link of the power amplifier is disconnected or the rear-stage hardware of the power amplifier is abnormal, controlling the relative gain index of the first frequency band so that the relative gain index of the first frequency band is less than a target relative gain index, wherein the target relative gain index is the relative gain index corresponding to the maximum allowable input power; The controlling the relative gain index of the first frequency band comprises: The relative gain index of the first frequency band is calibrated by using one or more of a feedback receiving loop FBRX, an average power tracking APT, and an envelope tracking ET, so that the relative gain index of the first frequency band is less than the target relative gain index.

5. The method according to claim 4, characterized in that The controlling the relative gain index of the first frequency band comprises: The relative gain index of the first frequency band is controlled so that the relative gain index of the first frequency band is smaller than the target relative gain index recorded in the memory.

6. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed, the method according to any one of claims 4 to 5 is implemented.

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