Radio frequency front-end module with input clipping protection, and electronic device

Abstract

Disclosed in the present invention are a radio frequency front-end module with input clipping protection, and an electronic device. The radio frequency front-end module comprises at least one transmission path, which comprises at least one stage of a power amplifier circuit, and an output matching circuit. Each stage of amplifier circuit comprises at least one clipping circuit and a biasing circuit thereof, and an input matching circuit and a power amplifier, wherein the clipping circuit, the input matching circuit, the power amplifier and the output matching circuit are sequentially connected in series; and the clipping circuit is used for performing clipping processing on an input signal power and then outputting a signal having a relatively small power, and when the input power of the transmission path is greater than a set threshold value, the clipping circuit enables a clipping function, such that the power amplifier is protected by means of reducing the input power.

Description

A radio frequency front-end module and electronic equipment with input limiting protection Technical Field

[0001] The present invention relates to a radio frequency front-end module with input limiting protection, and also to an electronic device comprising the radio frequency front-end module, belonging to the technical field of radio frequency integrated circuits. Background Art

[0002] The 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, the RF front-end often encounters the risk of these components burning out due to high input RF signal power. As shown in Figure 1, taking the PA amplifier module as the transmit path 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 achieved by adjusting the input and output matching. When the input power is high, the output power of the PA amplifier tube approaches saturation power. In this case, the voltage swing and current to which the PA amplifier tube is subjected are large, and the amplifier tube generates severe heat, which can easily cause the PA amplifier tube to burn out. To prevent the occurrence of burnout of RF front-end components, appropriate protection circuits are often added.

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

[0004] Summary of the Invention

[0005] The primary technical problem to be solved by the present 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] In order to achieve the above object, the present invention adopts the following technical solutions:

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

[0009] The limiting circuit is used to limit the power of the input signal and then output a smaller power signal;

[0010] When the input power of the radio frequency path is greater than a set threshold, the limiting circuit starts a power limiting function to protect the radio frequency component by reducing the input power.

[0011] Preferably, the amplitude limiting circuit includes a bias circuit for generating a bias voltage and a device or circuit with a voltage clamping function; the bias voltage acts on the device or circuit with a voltage clamping function to achieve a better amplitude limiting function.

[0012] Preferably, the radio frequency path includes at least one power amplifier circuit and an output matching circuit; each amplifier circuit includes at least one limiter circuit, an input matching circuit and an amplifier tube; wherein,

[0013] The limiter circuit, the input matching circuit, the amplifier 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 input radio frequency signal power;

[0016] The limiting circuit is used to perform limiting processing on the power of an input signal and then output a signal with lower power.

[0017] Preferably, the limiting circuit includes two diodes and a voltage divider resistor connected in series in a 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 and output ends of the limiting circuit respectively.

[0018] Preferably, the bias circuit of the amplitude limiting circuit is implemented by a low voltage dropout linear regulator; the output voltage of the low voltage 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 angle detection circuit; wherein,

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

[0021] Preferably, the process angle detection circuit is composed 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 the 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 end, the other end of the analog-to-digital converter is connected to the logic circuit, and the output end of the logic circuit is connected to the bias circuit of the limiting circuit.

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

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

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

[0025] The input end of the output power detection circuit is connected to the output matching circuit, and the output end is connected to the bias circuit of the limiter circuit; it is used to detect the output power and thus control the opening and closing of the protection function of the limiter circuit.

[0026] Preferably, the RF front-end module further includes a low-noise amplifier; the limiting circuit is added to the low-noise amplifier to protect the low-noise amplifier.

[0027] Preferably, the RF front-end module further includes a filter and / or a duplexer; one or more 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 a RF switch and / or an antenna tuner; one or more 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 an embodiment of the present invention, an electronic device is provided, which includes the above-mentioned radio frequency front-end module with input limiting protection.

[0030] Compared with the prior art, the RF front-end module with input limiting protection provided by the present invention achieves input power limitation and protection for multiple functional components in the RF front-end module by adopting the technical solution of the limiting circuit; at the same time, it can achieve effective protection and flexible adjustment of the 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 the present invention has the beneficial effects of ingenious and reasonable structural design, low design cost, high reliability, flexible and convenient adjustment, and excellent circuit performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG1 is a schematic diagram of the structure of a PA amplifier module in a transmitting path in the prior art;

[0032] FIG2( a ) is a schematic structural diagram of a radio frequency front-end module with input limiting protection provided by the present invention;

[0033] FIG2( b ) is a circuit diagram of a limiter circuit in an embodiment of the present invention;

[0034] FIG3 is a comparison diagram showing how the power received by the amplifiers of a radio frequency front-end circuit with a limiting circuit and a radio frequency front-end circuit without a limiting circuit vary with input power in an embodiment of the present invention;

[0035] FIG4( a ) is a schematic structural diagram of a radio frequency front-end module with input clipping protection in a first embodiment of the present invention;

[0036] FIG4( b ) is a circuit schematic diagram of a bias circuit of a limiter circuit in the first embodiment of the present invention.

[0037] FIG5( a ) is a schematic diagram showing a curve showing consistent amplitude limiting at various temperatures after the bias circuit of the input amplitude limiting circuit adopts an LDO circuit in the first embodiment of the present invention;

[0038] FIG5( b ) is a curve diagram showing that, in the first embodiment of the present invention, after the bias circuit of the input limiter circuit adopts an LDO circuit, the higher the temperature, the stronger the limiter capability;

[0039] FIG5( c ) is a curve diagram showing that, in the first embodiment of the present invention, after the bias circuit of the input limiter circuit adopts an LDO circuit, the lower the temperature, the stronger the limiting capability;

[0040] FIG6( a ) is a schematic structural diagram of a radio frequency front-end module with input clipping protection in a second embodiment of the present invention;

[0041] FIG6( b ) is a circuit diagram of a process angle detection circuit in a second embodiment of the present invention;

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

[0043] FIG8 is a schematic structural diagram of a radio frequency front-end module with input limiting protection according to a fourth embodiment of the present invention;

[0044] FIG9 is a schematic structural diagram of a radio frequency front-end module with input limiting protection according to a fifth embodiment of the present invention;

[0045] FIG10 is a schematic structural diagram of a radio frequency front-end module with input limiting protection according to a sixth embodiment of the present invention;

[0046] FIG11 is a schematic diagram of an electronic device using the radio frequency front-end module with input limiting protection provided by the present invention. DETAILED DESCRIPTION

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

[0048] As shown in Figure 2(a), the present invention provides a radio frequency front-end module with input clipping protection, comprising at least one transmit path, including a clipping circuit and its bias circuit, an input matching circuit, an amplifier (PA), and an output matching circuit. The input terminal, clipping circuit, input matching circuit, amplifier (PA), output matching circuit, and output terminal are sequentially connected in series to form the transmit path.

[0049] The input matching circuit and the output matching circuit are used for impedance matching; the amplifier tube is used to amplify the input RF signal power; the limiter circuit is used to limit the input signal power and then output a smaller power signal; when the input power of the transmitting path is greater than the set threshold, the limiter circuit starts the limiting function and protects the amplifier tube by reducing the input power.

[0050] The limiting circuit includes a bias circuit that generates a bias voltage and a device or circuit with a voltage clamping function, such as a diode, a transistor and other devices and a circuit composed of devices. In one embodiment of the present invention, as shown in Figure 2(b), the limiting circuit can be implemented using a diode 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 of the limiting circuit respectively. The voltage divider resistor connected to the bias voltage terminal can be used or cancelled according to the specific situation and is an optional configuration.

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

[0052] As shown in Figure 3, the protective effect of the input limiting circuit can be seen from a comparison with the prior art. The upper straight line in Figure 3 shows the power received by the amplifier as the input power changes (assuming no reflection matching) for the RF front-end circuit without a limiting circuit (prior art). The lower curve in Figure 3 shows the power received by the amplifier as the input power changes for the RF front-end circuit with an input limiting circuit provided by the present invention. By comparison, it can be seen that the actual input power of the amplifier is significantly reduced after the limiting circuit is added.

[0053] The circuit structure of the radio frequency front-end module with input limiting protection provided by the present invention and the protection function achieved are further explained below through some specific embodiments.

[0054] First embodiment

[0055] As shown in FIG4(a), in a first embodiment of the present invention, an RF front-end module with input limiting protection includes at least one transmitting 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, and different bias voltages can be provided for the limiting circuit. This solution can adjust the state of the limiting circuit by adjusting the output voltage of the LDO to meet different input power requirements, thereby achieving circuit protection for different input powers. At the same time, the temperature coefficient of the LDO output voltage is also adjustable for different application scenarios, which can meet the limiting protection requirements of different application scenarios.

[0056] As shown in Figure 4(b), the bias circuit structure of the limiter circuit can adopt the common LDO circuit structure in the prior art. In this structure, 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 resistor value. Figures 5(a), 5(b), and 5(c) show how the three limiting capabilities vary with temperature.

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

[0058] In addition, if the bias circuit of the limiting circuit adopts an LDO circuit, the limiting capability can be enhanced or weakened under high or low temperature conditions. In this case, special treatment of the temperature coefficient of the LDO is required.

[0059] Second embodiment

[0060] As shown in Figure 6(a), in the second embodiment of the present invention, an RF front-end module with input clipping protection includes at least one transmit path, which includes a clipping circuit and its bias circuit, an input matching circuit, an amplifier (PA), an output matching circuit, and a process corner detection circuit. The bias circuit of the clipping circuit is implemented using an LDO circuit. The difference from the first embodiment lies in the addition of a process corner detection circuit connected to the LDO circuit. The process corner detection circuit can provide feedback on the current on-chip diode's conduction voltage. This conduction voltage is used to adjust the LDO's output voltage, thereby achieving consistency in the input clipping circuit under different process corners. It should be noted that process corner refers to changes in circuit parameters caused by process deviations in integrated circuit design, such as doping concentration, temperature control during manufacturing, and etching level. These changes can affect resistor characteristics, such as resistance and temperature coefficient. Bulk resistors (mesa resistors) and thin film resistors (TFRs) are typical resistors that are susceptible to process corner variations.

[0061] As shown in Figure 6(b), a typical process angle detection circuit consists of at least one high-precision resistor, a bulk resistor (mesa resistor), an analog-to-digital converter (ADC), and a logic circuit. One end of the mesa resistor is connected to ground, 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, and the other end of the ADC is connected to the logic circuit. The output of the logic circuit is connected to an LDO circuit (i.e., the bias circuit of the limiter circuit).

[0062] During normal operation of the transmit path, the mesa resistor varies with the process angle. By dividing the supply voltage using a high-precision resistor and the mesa resistor, a voltage value that varies with the process angle can be output. This voltage value is processed by the ADC and corresponding logic to control the output voltage of the LDO, ensuring the consistency of the limiter circuit under different process angles.

[0063] Third embodiment

[0064] As shown in Figure 7, in a third embodiment of the present invention, an RF front-end module with input clipping protection includes at least one transmit path, which includes a first clipping circuit, an input matching circuit, a second clipping circuit, an amplifier (PA), an output matching circuit, a bias circuit (LDO) for the clipping circuit, and a process angle detection circuit. The first clipping circuit is connected to the input of the input matching circuit, and the second clipping circuit is connected to the output of the input matching circuit. The process angle detection circuit is connected to the LDO circuit, and the output of the LDO circuit is connected to the first and second clipping circuits, respectively, to provide bias voltages for them.

[0065] This embodiment differs from the second embodiment in that a second-stage limiting circuit is added. 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; limiting circuits can be added before, during, or after the input matching circuit. The use of a multi-stage limiting circuit solution can achieve better protection. Furthermore, because the voltage swings of various nodes in the circuit vary, more appropriate nodes can be selected for the addition of limiting circuits, enabling flexible and convenient limiting adjustment in a variety of application scenarios.

[0066] Fourth embodiment

[0067] As shown in Figure 8, in a fourth embodiment of the present invention, an RF front-end module with input clipping protection includes at least one transmit path, comprising a multi-stage power amplifier circuit, an output matching circuit, an LDO circuit, and a process angle detection circuit. Each power amplifier stage consists of a first clipping circuit, an input matching circuit, a second clipping circuit, and an amplifier tube connected in series. The process angle detection circuit is connected to the LDO circuit, which serves as a bias circuit. Its output is connected to each clipping circuit to provide a bias voltage for the clipping circuit.

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

[0069] Fifth embodiment

[0070] As shown in Figure 9, in the fifth embodiment of the present invention, an RF front-end module with input clipping protection includes at least one transmit path, which includes a multi-stage power amplifier circuit, an output matching circuit, an LDO circuit, a process angle detection circuit, and an output power detection circuit. Compared to the fourth embodiment, the difference lies in the addition of an output power detection circuit. The input end of the output power detection circuit is connected to the output matching circuit, and the output end is connected to the LDO circuit. By detecting the output power, it determines whether to activate the protection function of each clipping circuit, thereby preventing the clipping circuit from deteriorating circuit performance under low power conditions. At the same time, the activation threshold of the clipping circuit can also be flexibly adjusted based on the detected output power.

[0071] Sixth embodiment

[0072] As shown in FIG10 , in a 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 (FILTER) or a duplexer (DUPLEXER / DIPLEXER), a radio frequency switch (SWITCH), or an antenna tuner. The limiting circuit can be used not only for the power amplifier component but, to meet the specific protection requirements of each component, can also be selectively used to protect components such as the low-noise amplifier, filter or duplexer, and radio frequency switch or antenna tuner. Furthermore, depending on actual needs, single-stage or multi-stage limiting circuits can be employed, and corresponding process angle detection circuits and / or output power detection circuits can be selected for coordination with the LDO circuit to achieve protection functions tailored to different requirements.

[0073] The above six embodiments have been used to describe in detail the circuit structure and working principle of the RF front-end module with input limiting protection provided by the present invention. Based on the RF front-end module, an embodiment of the present invention also provides an electronic device, which includes a RF front-end module with input limiting protection, which can be used as an important component of a communication component. The electronic device mentioned here refers to 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, NR, etc., including mobile phones, laptops, tablet computers, car computers, etc. In addition, the technical solution provided by the present invention is also applicable to other applications of RF integrated circuits, such as communication base stations, smart connected cars, etc.

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

[0075] In summary, compared with the prior art, the RF front-end module with input limiting protection provided by the present invention achieves input power limitation and protection of multiple functional components in the RF front-end module by adopting the technical solution of the limiting circuit; at the same time, it can achieve effective protection and flexible adjustment of the 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 the present invention has the beneficial effects 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 only examples, and the technical solutions of the various embodiments can be combined and are all within the protection scope of the present invention.

[0077] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0078] The above describes in detail the RF front-end module and electronic device with input clipping protection provided by the present invention. For those skilled in the art, any obvious modification made to the present invention without departing from the essence of the present invention will constitute an infringement of the patent rights of the present invention and will result in corresponding legal liability.

Claims

1. A radio frequency front-end module with input limiting protection, characterized in that The invention comprises at least one radio frequency path, the radio frequency path comprising at least one limiting circuit and at least one protected radio frequency component; wherein, The limiting circuit is used to output a smaller power signal after limiting the power of the input signal; When the input power of the RF path is greater than a set threshold, the limiting circuit starts a power limiting function to protect the RF component by reducing the input power.

2. The RF front-end module with input limiting protection according to claim 1, characterized in that: The amplitude limiting circuit comprises a bias circuit for generating a bias voltage and a device or circuit with a voltage clamping function; the bias voltage acts on the device or circuit with a voltage clamping function to achieve a better amplitude limiting function.

3. The RF front-end module with input limiting protection according to claim 1, characterized in that: The radio frequency path includes at least one power amplifier circuit and an output matching circuit; each amplifier circuit includes at least one limiting circuit, an input matching circuit and an amplifier tube; wherein, The amplitude limiting circuit, the input matching circuit, the amplifier 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 input radio frequency signal power; The limiting circuit is used to output a signal with lower power after limiting the power of the input signal.

4. The RF front-end module with input limiting protection according to 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 end and the output end of the limiting circuit respectively.

5. The RF front-end module with input limiting protection according to claim 1, characterized in that: The bias circuit of the amplitude limiting circuit is implemented by a low voltage difference linear regulator; the output voltage of the low voltage difference 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 according to claim 1, characterized in that: The RF path also includes a process angle detection circuit; wherein, The process angle detection circuit is connected to the bias circuit of the limiter circuit to generate a voltage that varies with the process angle to control the bias voltage output by the bias circuit of the limiter circuit, thereby achieving consistency of limiter protection under different process angles.

7. The RF front-end module with input limiting protection according to claim 6, characterized in that: The process angle detection circuit is composed 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 the 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 end, the other end of the analog-to-digital converter is connected to the logic circuit, and the output end of the logic circuit is connected to the bias circuit of the limiting circuit.

8. The radio frequency front-end module with input limiting protection according to claim 3, characterized in that: Each stage of the amplifier circuit includes a plurality of the limiting circuits, wherein the plurality of limiting circuits are respectively connected in series before and / or in the middle and / or after the input matching circuit, so as to realize flexible adjustment of the limiting size in various application scenarios.

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

10. The radio frequency front-end module with input limiting protection according to claim 1, characterized in that: The radio frequency path also includes an output power detection circuit; wherein, The input end of the output power detection circuit is connected to the output matching circuit, and the output end is connected to the bias circuit of the limiter circuit; it is used to detect the size of the output power, so as to Control the opening and closing of the limiting circuit protection function.

11. The radio frequency front-end module with input limiting protection according to claim 1, characterized in that: The RF front-end module also includes a low noise amplifier; the limiting circuit is added to the low noise amplifier to protect the low noise amplifier.

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

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

14. An electronic device, characterized in that A radio frequency front-end module with input limiting protection comprising any one of claims 1 to 13.

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