Radio frequency front-end module with input amplitude limiting protection and electronic device

Abstract

The application discloses a radio frequency front end module with input amplitude limiting protection and electronic equipment. The radio frequency front end module comprises at least one transmitting path, the transmitting path comprises at least one stage of power amplifier circuit and output matching circuit; each stage of amplifier circuit comprises at least one amplitude limiting circuit and a bias circuit thereof, an input matching circuit and an amplifying tube. Wherein, the amplitude limiting circuit, the input matching circuit, the amplifying tube and the output matching circuit are connected in series. The amplitude limiting circuit is used for performing amplitude limiting processing on the input signal power and outputting a smaller power signal. When the input power of the transmitting path is greater than a set threshold, the amplitude limiting circuit starts the amplitude limiting function, and the protection of the amplifying tube is realized by reducing the input power.

Description

Technical Field

[0001] This invention relates to a radio frequency front-end module with input limiting protection, and also to electronic devices including the radio frequency front-end module, belonging to the field of radio frequency integrated circuit technology. Background Technology

[0002] A radio frequency (RF) front-end typically consists of components such as a low-noise amplifier (LNA), a power amplifier (PA), a filter, and an RF switch. During operation, RF front-ends frequently encounter situations where high-power input RF signals cause these components to burn out. For example... Figure 1 As shown, taking the transmit path PA amplifier module as an example, the PA amplifier module includes an input matching circuit, a PA amplifier tube, and an output matching circuit. Typically, the desired gain and power capability are obtained by adjusting the input and output matching circuits. When the input power is high, the output power of the PA amplifier tube will approach its saturation power. In this case, the voltage swing and current experienced by the PA amplifier tube will be very large, and the tube will generate significant heat, easily leading to burnout. To avoid accidents that damage the RF front-end components, protection circuits are usually added accordingly.

[0003] In existing technologies, a common protection method is to adjust the amplifier gain based on the power that the RF front-end component can withstand by detecting the component's output power, thereby protecting the component. However, this method, similar to AGC (Automatic Gain Control), has significant limitations. For example, the slow response speed may result in the component being burned out before the protection function is activated. Furthermore, the feedback structure of the control may cause stability issues with the amplifier, and this method is also difficult to apply to filters.

[0004] Chinese patent application No. 202210117163.2 discloses a protection circuit for an RF power amplifier. This protection circuit is applied to an RF power amplifier module, which includes a first transistor and an RF power amplifier. The first transistor is coupled to the RF power amplifier, and a bias current is generated at the collector of the first transistor. The protection circuit includes: an overcurrent detection circuit, including a current mirror circuit, for receiving and adjusting the bias current and generating an overcurrent signal based on the bias current; and a control module for receiving the overcurrent signal to control the operating state of the RF power amplifier. This protection circuit reduces the risk of chip burn-in in the RF power amplifier. Summary of the Invention

[0005] The primary technical problem to be solved by this invention is to provide a radio frequency front-end module with input limiting protection.

[0006] Another technical problem to be solved by the present invention is to provide an electronic device including the radio frequency front-end module.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] According to a first aspect of the present invention, a radio frequency (RF) front-end module with input limiting protection is provided, comprising at least one RF path, the RF path including at least one limiting circuit, and at least one protected RF component; wherein,

[0009] The limiting circuit is used to limit the power of the input signal and output a lower power signal.

[0010] When the input power of the radio frequency path exceeds a set threshold, the limiting circuit activates the power limiting function to reduce the input power and protect the radio frequency components.

[0011] Preferably, the limiting circuit includes a bias circuit that generates a bias voltage and a device or circuit with a voltage clamping function; the bias voltage is applied to the device or circuit with the voltage clamping function to achieve better limiting function.

[0012] Preferably, the radio frequency path includes at least one stage of power amplifier circuit and output matching circuit; each stage of the amplifier circuit includes at least one limiting circuit, input matching circuit and amplifying transistor; wherein...

[0013] The limiting circuit, the input matching circuit, the amplifying tube, and the output matching circuit are connected in series in sequence.

[0014] The input matching circuit and the output matching circuit are used for impedance matching;

[0015] The amplifier tube is used to amplify the power of the input radio frequency signal;

[0016] The limiting circuit is used to limit the power of the input signal and output a lower power signal.

[0017] Preferably, the limiting circuit includes two diodes and a voltage divider resistor connected in series in the forward direction between the bias voltage terminal and the ground potential terminal, and two DC blocking capacitors connected to the connection point of the two diodes; wherein the other ends of the two DC blocking capacitors serve as the input terminal and the output terminal of the limiting circuit, respectively.

[0018] Preferably, the bias circuit of the limiting circuit is implemented using a low-dropout linear regulator; the output voltage of the low-dropout linear regulator is adjustable and / or the temperature coefficient of the output voltage is adjustable.

[0019] Preferably, the radio frequency path further includes a process corner detection circuit; wherein...

[0020] The process angle detection circuit is connected to the bias circuit of the limiting circuit to generate a voltage that varies with the process angle, thereby controlling the bias voltage output by the bias circuit of the limiting circuit and achieving consistency of limiting protection under different process angles.

[0021] Preferably, the process corner detection circuit consists of a high-precision resistor, a bmesa resistor, an analog-to-digital converter, and a logic circuit; wherein one end of the bmesa resistor is connected to ground potential, and the other end is connected to the high-precision resistor and the analog-to-digital converter; the other end of the high-precision resistor is connected to the power supply voltage terminal; the other end of the analog-to-digital converter is connected to the logic circuit; and the output terminal of the logic circuit is connected to the bias circuit of the limiting circuit.

[0022] Preferably, each amplifier stage includes multiple limiting circuits, wherein the multiple limiting circuits are connected in series before and / or in the middle and / or after the input matching circuit, so as to flexibly adjust the limiting size in various application scenarios.

[0023] Preferably, the radio frequency path includes a multi-stage power amplifier circuit and one or more limiting circuits, wherein one of the limiting circuits is connected to the input terminal of the radio frequency path.

[0024] Preferably, the radio frequency path further includes an output power detection circuit; wherein...

[0025] The input terminal of the output power detection circuit is connected to the output matching circuit, and the output terminal is connected to the bias circuit of the limiting circuit; it is used to detect the magnitude of the output power, thereby controlling the opening and closing of the protection function of the limiting circuit.

[0026] Preferably, the radio frequency front-end module further includes a low-noise amplifier; the limiting circuit is incorporated into the low-noise amplifier to protect it.

[0027] Preferably, the RF front-end module further includes a filter and / or a duplexer; one or more of the limiting circuits are respectively connected to the filter and / or the duplexer to protect the filter and / or the duplexer.

[0028] Preferably, the RF front-end module further includes an RF switch and / or an antenna tuner; one or more of the limiting circuits are respectively connected to the RF switch and / or the antenna tuner to protect the RF switch and / or the antenna tuner.

[0029] According to a second aspect of the present invention, an electronic device is provided, which includes the radio frequency front-end module with input limiting protection described above.

[0030] Compared with existing technologies, the RF front-end module with input limiting protection provided by this invention achieves input power limitation and protection for multiple functional components in the RF front-end module by employing a limiting circuit technical solution. Simultaneously, it enables effective protection and flexible adjustment of components in the RF front-end module under application scenarios such as different temperatures, different process angles, and different input powers. Therefore, the RF front-end module with input limiting protection provided by this invention has the advantages of ingenious and reasonable structural design, low design cost, high reliability, flexible and convenient adjustment, and excellent circuit performance. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the PA amplifier module in the transmission path in the prior art;

[0032] Figure 2(a) is a schematic diagram of the structure of the radio frequency front-end module with input limiting protection provided by the present invention;

[0033] Figure 2(b) is a circuit diagram of a limiting circuit in an embodiment of the present invention;

[0034] Figure 3 This is a comparison diagram of the power received by the amplifier of an RF front-end circuit with a limiting circuit and an RF front-end circuit without a limiting circuit, as shown in this embodiment of the invention, with the power at the input terminal changing.

[0035] Figure 4(a) is a schematic diagram of the structure of the radio frequency front-end module with input limiting protection in the first embodiment of the present invention;

[0036] Figure 4(b) is a circuit diagram of the bias circuit of the limiting circuit in the first embodiment of the present invention.

[0037] Figure 5(a) is a schematic diagram of the consistent limiting curves under various temperatures after the bias circuit of the input limiting circuit adopts an LDO circuit in the first embodiment of the present invention.

[0038] Figure 5(b) is a schematic diagram showing that the higher the temperature, the stronger the limiting capability after the bias circuit of the input limiting circuit adopts an LDO circuit in the first embodiment of the present invention.

[0039] Figure 5(c) is a schematic diagram showing that the lower the temperature, the stronger the limiting capability after the bias circuit of the input limiting circuit adopts an LDO circuit in the first embodiment of the present invention.

[0040] Figure 6(a) is a schematic diagram of the structure of the radio frequency front-end module with input limiting protection in the second embodiment of the present invention;

[0041] Figure 6(b) is a circuit diagram of the process corner detection circuit in the second embodiment of the present invention;

[0042] Figure 7 This is a schematic diagram of the structure of the radio frequency front-end module with input limiting protection in the third embodiment of the present invention;

[0043] Figure 8 This is a schematic diagram of the structure of the radio frequency front-end module with input limiting protection in the fourth embodiment of the present invention;

[0044] Figure 9 This is a schematic diagram of the structure of the radio frequency front-end module with input limiting protection in the fifth embodiment of the present invention;

[0045] Figure 10 This is a schematic diagram of the structure of the radio frequency front-end module with input limiting protection in the sixth embodiment of the present invention;

[0046] Figure 11 This is a schematic diagram of an electronic device employing the radio frequency front-end module with input limiting protection provided by the present invention. Detailed Implementation

[0047] The technical content of the present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0048] As shown in Figure 2(a), the RF front-end module with input limiting protection provided by the present invention includes at least one transmission path, which includes a limiting circuit and its bias circuit, an input matching circuit, an amplifier (PA), and an output matching circuit. The input terminal, limiting circuit, input matching circuit, PA, output matching circuit, and output terminal are connected in series to form the transmission path.

[0049] The input matching circuit and output matching circuit are used for impedance matching; the amplifier tube is used to amplify the power of the input RF signal; the limiting circuit is used to limit the power of the input signal and output a lower power signal; when the input power of the transmission path is greater than the set threshold, the limiting circuit activates the limiting function to protect the amplifier tube by reducing the input power.

[0050] The limiting circuit includes a bias circuit that generates a bias voltage and devices or circuits with voltage clamping function, such as diodes, transistors, and circuits composed of these devices. In one embodiment of the present invention, as shown in FIG2(b), the limiting circuit can be implemented using diodes with a bias voltage. Specifically, the limiting circuit includes two diodes and a voltage divider resistor connected in series in the forward direction between the bias voltage terminal and the ground potential terminal, and two DC blocking capacitors connected to the connection point of the two diodes. The other ends of the two DC blocking capacitors serve as the input and output terminals of the limiting circuit, respectively. The voltage divider resistor connected to the bias voltage terminal can be used or omitted depending on the specific situation and is an optional configuration.

[0051] In a limiting circuit, when a bias voltage is applied to the diode to bring it to a critical conduction state, the limiting circuit can limit the input power when the input power is high (exceeding a set threshold), thereby protecting the amplifier components. It should be noted that the structure of the input limiting circuit is not limited to using a diode; other circuit structures can be used in other embodiments of the invention.

[0052] like Figure 3 As shown, the protection effect of the input limiting circuit can be seen from the comparison with the prior art. Figure 3 The straight line at the top represents the RF front-end circuit without a limiting circuit (existing technology), showing how the power received by the amplifier changes with the input power (assuming no reflection matching). Figure 3 The lower curve shows the variation of the amplifier's received power with the input power in the RF front-end circuit with input limiting circuit provided by this invention. A comparison shows that adding the limiting circuit significantly reduces the amplifier's actual input power.

[0053] The circuit structure and protection function of the RF front-end module with input limiting protection provided by the present invention will be further illustrated below through some specific embodiments.

[0054] First Embodiment

[0055] As shown in Figure 4(a), in the first embodiment of the present invention, the RF front-end module with input limiting protection includes at least one transmit path, which includes a limiting circuit and its bias circuit, an input matching circuit, an amplifier (PA), and an output matching circuit. The bias circuit of the limiting circuit is implemented using an LDO (low dropout linear regulator) circuit. The output voltage of the LDO is adjustable, providing different bias voltages for the limiting circuit. This solution allows for circuit protection at different input power levels by adjusting the output voltage of the LDO to change the state of the limiting circuit. Furthermore, the temperature coefficient of the LDO output voltage is also adjustable for different application scenarios, meeting the limiting protection requirements of various applications.

[0056] As shown in Figure 4(b), the bias circuit of the limiting circuit can adopt the LDO circuit structure commonly used in the prior art. In this circuit, the PTAT current is output after passing through a resistor with a negative temperature coefficient. Therefore, the temperature coefficient can be adjusted from negative to positive simply by adjusting the value of the resistor. Figures 5(a), 5(b), and 5(c) show the three limiting capabilities as a function of temperature.

[0057] As shown in Figure 5(a), after adopting an LDO circuit in the bias circuit of the limiting circuit, consistent limiting is achieved under various temperatures. The three curves from bottom to top represent the power received by the amplifier as a function of the input power at temperatures of 85°C, 25°C, and -30°C, respectively. As shown in Figure 5(b), after adopting an LDO circuit in the bias circuit of the limiting circuit, the limiting capability increases with higher temperatures. The three curves from bottom to top represent the power received by the amplifier as a function of the input power at temperatures of 85°C, 25°C, and -30°C, respectively. As shown in Figure 5(c), after adopting an LDO circuit in the bias circuit of the limiting circuit, the limiting capability increases with lower temperatures. The three curves from top to bottom represent the power received by the amplifier as a function of the input power at temperatures of 85°C, 25°C, and -30°C, respectively.

[0058] In addition, by using an LDO circuit for the bias circuit of the limiting circuit, it is possible to achieve either enhanced or weakened limiting capabilities under high or low temperature conditions. In this case, special treatment is required for the temperature coefficient of the LDO.

[0059] Second Embodiment

[0060] As shown in Figure 6(a), in the second embodiment of the present invention, the RF front-end module with input limiting protection includes at least one transmit path. This transmit path includes a limiting circuit and its bias circuit, an input matching circuit, an amplifier transistor (PA), an output matching circuit, and a process corner detection circuit. The bias circuit of the limiting circuit is implemented using an LDO circuit. The difference from the first embodiment is the addition of a process corner detection circuit, which is connected to the LDO circuit. The process corner detection circuit can provide feedback on the on-state voltage of the diodes on the current chip. By adjusting the output voltage of the LDO using this on-state voltage, the consistency of the input limiting circuit under different process corners can be achieved.

[0061] As shown in Figure 6(b), a simple process corner detection circuit consists of at least one high-precision resistor, a bmesa resistor, an analog-to-digital converter (ADC), and a logic circuit. One end of the bmesa resistor is connected to ground potential, and the other end is connected to the high-precision resistor and the ADC. The other end of the high-precision resistor is connected to the power supply voltage terminal, and the other end of the ADC is connected to the logic circuit. The output terminal of the logic circuit is connected to the LDO circuit (i.e., the bias circuit of the limiting circuit).

[0062] During normal operation of the transmit path, the bmesa resistor changes with the process corner. By dividing the supply voltage through a high-precision resistor and the bmesa resistor, a voltage value that varies with the process corner can be output. This voltage value is processed by the ADC and corresponding logic to control the output voltage of the LDO, which can ensure the consistency of the limiting circuit under different process corners.

[0063] Third Embodiment

[0064] like Figure 7 As shown, in the third embodiment of the present invention, the RF front-end module with input limiting protection includes at least one transmit path. This transmit path includes a first limiting circuit, an input matching circuit, a second limiting circuit, an amplifier transistor (PA), and an output matching circuit, as well as a bias circuit (LDO) for the limiting circuit and a process corner detection circuit. The first limiting circuit is connected to the input terminal of the input matching circuit, and the second limiting circuit is connected to the output terminal of the input matching circuit. The process corner detection circuit is connected to the LDO circuit, and the output terminal of the LDO circuit is connected to both the first and second limiting circuits, providing them with a bias voltage.

[0065] The difference between this embodiment and the second embodiment lies in the addition of a second-stage limiting circuit. It should be noted that the connection location of the limiting circuit to the transmission path is not limited to the input terminal; furthermore, the limiting circuit is not limited to adding one stage; it can be added before, during, or after the input matching circuit. Using a multi-stage limiting circuit scheme can achieve better protection. Furthermore, since the voltage swing at each node in the circuit is different, a more suitable node can be selected to add the limiting circuit, enabling flexible and convenient limiting adjustment in various application scenarios.

[0066] Fourth embodiment

[0067] like Figure 8 As shown, in the fourth embodiment of the present invention, the RF front-end module with input limiting protection includes at least one transmit path, which includes a multi-stage power amplifier circuit, an output matching circuit, an LDO circuit, and a process corner detection circuit. Each stage of the power amplifier circuit is composed of a first limiting circuit, an input matching circuit, a second limiting circuit, and an amplifying transistor connected in series. The process corner detection circuit is connected to the LDO circuit, which acts as a bias circuit, and its output is connected to each limiting circuit to provide a bias voltage for the limiting circuits.

[0068] It should be noted that the use of limiting circuits is not limited to single-stage power amplifiers. In multi-stage power amplifiers, limiting circuits can be used as protection circuits at the input terminal of each stage to achieve the desired limiting protection effect. Furthermore, apart from the limiting circuit connected to the input terminal in the first-stage power amplifier circuit, other limiting circuits can be selectively configured according to the specific requirements of the application scenario.

[0069] Fifth Embodiment

[0070] like Figure 9 As shown, in the fifth embodiment of the present invention, the RF front-end module with input limiting protection includes at least one transmit path, which includes a multi-stage power amplifier circuit, an output matching circuit, an LDO circuit, a process corner detection circuit, and an output power detection circuit. The difference compared to the fourth embodiment is the addition of an output power detection circuit. The input terminal of this output power detection circuit is connected to the output matching circuit, and the output terminal is connected to the LDO circuit. It detects the output power to determine whether to activate the protection function of each limiting circuit, preventing the limiting circuit from degrading circuit performance under low power conditions. Simultaneously, it can flexibly adjust the activation threshold of the limiting circuit based on the detected output power.

[0071] Sixth Embodiment

[0072] like Figure 10As shown, in the sixth embodiment of the present invention, the frequency front-end module further includes components such as a low-noise amplifier (LNA), a power amplifier (PA), a filter or duplexer / diplexer, a radio frequency switch, or an antenna tuner. The limiting circuit can be used not only for the power amplifier component, but also selectively for protecting components such as the low-noise amplifier, filter or duplexer, radio frequency switch, or antenna tuner, to meet the specific protection requirements of each component. Furthermore, depending on actual needs, one or more levels of limiting circuits can be used, along with appropriate process corner detection circuits and / or output power detection circuits to cooperate with the LDO circuit, to achieve protection functions under different requirements.

[0073] The circuit structure and working principle of the RF front-end module with input limiting protection provided by the present invention have been described in detail above through six embodiments. Based on this RF front-end module, embodiments of the present invention also provide an electronic device, including the RF front-end module with input limiting protection, which can serve as an important component of a communication assembly. The electronic device referred to here means a computer device that can be used in a mobile environment and supports multiple communication standards such as GSM, EDGE, CDMA, TD-SCDMA, WCDMA, TDD-LTE, FDD-LTE, and NR, including mobile phones, laptops, tablets, and in-vehicle computers. Furthermore, the technical solution provided by the present invention is also applicable to other applications of RF integrated circuits, such as communication base stations and intelligent connected vehicles.

[0074] like Figure 11 As shown, this electronic device includes at least a processor, a memory, and a communication component. It may further include a sensor component, a power supply component, a multimedia component, and an input / output interface, depending on actual needs. The memory, communication component, sensor component, power supply component, multimedia component, and input / output interface are all connected to the processor. The memory can be a static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, etc. The processor can be a central processing unit (CPU), graphics processing unit (GPU), field-programmable gate array (FPGA), application-specific integrated circuit (ASIC), digital signal processing (DSP) chip, etc. Other communication components, sensor components, power supply components, multimedia components, etc., can be implemented using general-purpose components and will not be specifically described here.

[0075] In summary, compared with existing technologies, the RF front-end module with input limiting protection provided by this invention, through the adoption of a limiting circuit, achieves input power limitation and protection for multiple functional components in the RF front-end module. Simultaneously, it enables effective protection and flexible adjustment of components in the RF front-end module under application scenarios such as different temperatures, different process angles, and different input powers. Therefore, the RF front-end module with input limiting protection provided by this invention has the advantages of ingenious and reasonable structural design, low design cost, high reliability, flexible and convenient adjustment, and excellent circuit performance.

[0076] It should be noted that the above embodiments are merely examples, and the technical solutions of each embodiment can be combined, all of which are within the protection scope of this invention.

[0077] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0078] The above provides a detailed description of the RF front-end module and electronic device with input limiting protection provided by the present invention. Any obvious modifications made by those skilled in the art without departing from the essence of the present invention will constitute an infringement of the patent rights of the present invention and will incur corresponding legal liability.

Claims

1. A radio frequency front-end module with input limiting protection, characterized in that... It includes at least one radio frequency (RF) path, which comprises a process corner detection circuit, at least one limiting circuit, and at least one protected RF component; wherein, The limiting circuit is used to limit the power of the input signal and output a lower power signal. When the input power of the radio frequency path is greater than a set threshold, the limiting circuit activates the power limiting function to protect the radio frequency components by reducing the input power. The process angle detection circuit includes a bmesa resistor, which changes with the process angle. The process angle detection circuit is connected to the bias circuit of the limiting circuit to generate a voltage that changes with the process angle, thereby controlling the bias voltage output by the bias circuit of the limiting circuit and achieving consistency of limiting protection under different process angles.

2. The RF front-end module with input limiting protection as described in claim 1, characterized in that: The limiting circuit includes a bias circuit that generates a bias voltage and a device or circuit with a voltage clamping function; the bias voltage is applied to the device or circuit with the voltage clamping function to achieve better limiting function.

3. The RF front-end module with input limiting protection as described in claim 1, characterized in that: The radio frequency path includes at least one stage of power amplifier circuit and output matching circuit; each stage of the amplifier circuit includes at least one limiting circuit, input matching circuit and amplifying transistor; wherein... The limiting circuit, the input matching circuit, the amplifying tube, and the output matching circuit are connected in series in sequence. The input matching circuit and the output matching circuit are used for impedance matching; The amplifier tube is used to amplify the power of the input radio frequency signal; The limiting circuit is used to limit the power of the input signal and output a lower power signal.

4. The RF front-end module with input limiting protection as described in claim 1, characterized in that: The limiting circuit includes two diodes and a voltage divider resistor connected in series in the forward direction between the bias voltage terminal and the ground potential terminal, and two DC blocking capacitors connected to the connection point of the two diodes; wherein, the other ends of the two DC blocking capacitors serve as the input terminal and the output terminal of the limiting circuit, respectively.

5. The RF front-end module with input limiting protection as described in claim 1, characterized in that: The bias circuit of the limiting circuit is implemented using a low-dropout linear regulator; the output voltage of the low-dropout linear regulator is adjustable and / or the temperature coefficient of the output voltage is adjustable.

6. The RF front-end module with input limiting protection as described in claim 1, characterized in that: The process corner detection circuit also includes a high-precision resistor, an analog-to-digital converter, and a logic circuit; wherein, one end of the bmesa resistor is connected to ground potential, and the other end is connected to the high-precision resistor and the analog-to-digital converter, the other end of the high-precision resistor is connected to the power supply voltage terminal, the other end of the analog-to-digital converter is connected to the logic circuit, and the output terminal of the logic circuit is connected to the bias circuit of the limiting circuit.

7. The RF front-end module with input limiting protection as described in claim 3, characterized in that: Each amplifier stage includes multiple limiting circuits, wherein the multiple limiting circuits are connected in series before and / or in the middle and / or after the input matching circuit, respectively, to enable flexible adjustment of the limiting magnitude in various application scenarios.

8. The RF front-end module with input limiting protection as described in claim 1, characterized in that: The radio frequency path includes a multi-stage power amplifier circuit and one or more limiting circuits, wherein one of the limiting circuits is connected to the input terminal of the radio frequency path.

9. The RF front-end module with input limiting protection as described in claim 3, characterized in that: The radio frequency path also includes an output power detection circuit; wherein... The input terminal of the output power detection circuit is connected to the output matching circuit, and the output terminal is connected to the bias circuit of the limiting circuit; it is used to detect the magnitude of the output power, thereby controlling the opening and closing of the protection function of the limiting circuit.

10. The RF front-end module with input limiting protection as described in claim 1, characterized in that: The radio frequency front-end module also includes a low-noise amplifier; the limiting circuit is incorporated into the low-noise amplifier to protect it.

11. The RF front-end module with input limiting protection as described in claim 1, characterized in that: The radio frequency front-end module further includes a filter and / or a duplexer; one or more of the limiting circuits are respectively connected to the filter and / or the duplexer to protect the filter and / or the duplexer.

12. The RF front-end module with input limiting protection as described in claim 1, characterized in that: The radio frequency front-end module further includes a radio frequency switch and / or an antenna tuner; one or more of the limiting circuits are respectively connected to the radio frequency switch and / or the antenna tuner to protect the radio frequency switch and / or the antenna tuner.

13. An electronic device, characterized in that... Includes the radio frequency front-end module with input limiting protection as described in any one of claims 1 to 12.

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