Power amplifier, control method, signal transmitting system and electronic equipment

Abstract

The embodiment of the invention discloses a power amplifier, a control method, a signal transmitting system and electronic equipment, and is applied to the technical field of wireless communication. The power amplifier includes a predistorter and a first amplifier. The predistorter comprises a plurality of equivalent capacitors. Wherein the first amplifier is used for inputting a first radio frequency signal and outputting a second radio frequency signal; the predistorter is used for inputting a control signal. The control signal is used for controlling at least one equivalent capacitor in the plurality of equivalent capacitors to be conducted with the input end of the first amplifier. When the equivalent capacitor is connected with the input end of the first amplifier, the phase of the second radio frequency signal is changed. According to the embodiment of the invention, at least one equivalent capacitor in the plurality of equivalent capacitors is controlled to be conducted with the input end of the first amplifier through the control signal. And the at least one equivalent capacitor after conduction can be adjusted to compensate the phase nonlinear distortion generated by the first amplifier. The power amplifier based on the equivalent capacitance is high in integration and suitable for various technologies.

Description

Technical Field

[0001] The present application relates to the field of wireless communication technology, and in particular to a power amplifier, a control method, a signal transmission system and an electronic device. Background Art

[0002] The power amplifier has a certain linear power working range. When the power of the RF signal input to the power amplifier is high, the RF signal output by the power amplifier has nonlinear distortion. This nonlinear distortion is divided into two types: amplitude-to-amplitude distortion (AM-AM distortion) that increases with the increase of signal amplitude, and amplitude-to-phase distortion (AM-PM distortion) that increases with the increase of signal amplitude. A method to solve nonlinear distortion is to set an analog predistortion (APD) in the front stage of the amplifier circuit, input the initial RF signal to the analog predistortion, and pre-apply the amplitude nonlinear characteristics to the initial RF signal to obtain a first RF signal, and then input the first RF signal into the amplifier circuit. The amplitude nonlinear characteristics applied to the first RF signal and the amplitude nonlinear characteristics generated by the amplifier circuit compensate each other, so that the amplifier circuit presents linear amplification according to the signal amplitude of the output second RF signal and the signal amplitude of the initial RF signal, that is, linear compensation is performed for the AM-AM distortion of the amplifier circuit. However, most analog predistorters do not consider linear compensation of AM-PM distortion.

[0003] One linear compensation method for AM-PM distortion is to compensate the AM-PM distortion of the amplifier circuit through an analog predistorter based on a Schottky diode. However, the analog predistorter based on a Schottky diode has poor system integration and is difficult to be applied to amplifier circuits of all processes. Summary of the invention

[0004] The embodiments of the present application provide a power amplifier, a control method, a signal transmission system and an electronic device, which improve the system integration of the power amplifier and are applicable to realize linear compensation of AM-PM distortion under various processes.

[0005] To achieve the above objectives, the embodiments of the present application adopt the following technical solutions:

[0006] In a first aspect, a power amplifier is provided, the power amplifier comprising a predistorter and a first amplifier. The predistorter comprises a plurality of equivalent capacitors. The first amplifier is used to input a first radio frequency signal and output a second radio frequency signal. The predistorter is used to input a control signal. The control signal is used to control at least one equivalent capacitor among the plurality of equivalent capacitors to be connected to an input end of the first amplifier. When the equivalent capacitor is connected to the input end of the first amplifier, the phase of the second radio frequency signal changes.

[0007] In an embodiment of the present application, a third predistorter is provided in the front stage of the first amplifier. A plurality of equivalent capacitors are provided in the third predistorter. When the plurality of equivalent capacitors in the third predistorter are not connected to the input end of the first amplifier, the initial RF signal input by the power amplifier will not be affected by the third predistorter, and the initial RF signal is input into the first amplifier as the first RF signal to obtain a second RF signal. Due to the nonlinear characteristics of the first amplifier, AM-PM distortion exists on the second RF signal at this time. When at least one equivalent capacitor among the plurality of equivalent capacitors is controlled to be connected to the input end of the first amplifier by a control signal, the capacitance characteristics of at least one equivalent capacitor after being connected will cause the phase of the initial RF signal to change, and a first RF signal with a phase nonlinear characteristic will be obtained. After the first RF signal with a phase nonlinear characteristic is input into the first amplifier, the phase nonlinear characteristic on the first RF signal will compensate for the phase nonlinear characteristic of the first amplifier, so that the phase of the output second RF signal changes. By adjusting the number of equivalent capacitors that are turned on according to the current operating power range of the first amplifier through a control signal, the phase of the output second RF signal can be kept consistent with the phase of the initial RF signal, thereby achieving compensation for AM-PM distortion. First, the use of equivalent capacitors can achieve fast and accurate analog pre-distortion compensation for AM-PM distortion. Second, equivalent capacitors can be applied to power amplifiers of different processes and have high system integration. Third, the use of equivalent capacitors to achieve compensation for AM-PM distortion does not require additional hardware cost. Fourth, equivalent capacitors can be integrated with power amplifiers to further enhance the system integration of the power amplifier.

[0008] In some possible implementations, for certain types of first amplifiers, the AM-PM distortion generated by the first amplifiers is manifested as follows: the phase of the output second radio frequency signal decreases as the signal power of the input first radio frequency signal increases.

[0009] Exemplarily, the multiple equivalent capacitors include multiple first equivalent capacitors. The control signal includes a first control signal. Wherein: the first control signal is used to: control at least one first equivalent capacitor among the multiple first equivalent capacitors to be connected in parallel with the input end of the first amplifier. When at least one first equivalent capacitor is connected in parallel with the input end of the first amplifier, the phase of the second RF signal increases. In an embodiment of the present application, when the phase of the second RF signal output by the first amplifier decreases as the signal power of the input first RF signal increases, the phase of the first RF signal can be increased after at least one first equivalent capacitor is connected in parallel with the input end of the first amplifier. After the first RF signal with increased phase is input into the first amplifier, the AM-PM distortion generated by the first amplifier can be compensated to output a second RF signal with a stable phase.

[0010] Exemplarily, the multiple equivalent capacitors also include multiple second equivalent capacitors. The control signal includes a second control signal. Wherein: the second control signal is used to: control at least one second equivalent capacitor among the multiple second equivalent capacitors to be connected in series with the input end of the first amplifier. When at least one second equivalent capacitor is connected in series with the input end of the first amplifier, the phase of the second RF signal is reduced. In an embodiment of the present application, when the phase of the second RF signal output by the first amplifier decreases as the signal power of the input first RF signal increases, when at least one second equivalent capacitor among the multiple second equivalent capacitors is connected in series with the input end of the first amplifier, the phase of the initial RF signal can be reduced. On the basis of increasing the phase of the first RF signal by at least one first equivalent capacitor, the phase of the first RF signal is fine-tuned and reduced based on at least one second equivalent capacitor, so as to make a more precise adjustment of the AM-PM distortion generated by the first amplifier.

[0011] In a possible implementation manner, for certain types of first amplifiers, the AM-PM distortion generated by the first amplifiers is manifested as follows: the phase of the output second radio frequency signal increases as the signal power of the input first radio frequency signal increases.

[0012] Exemplarily, the multiple equivalent capacitors include multiple second equivalent capacitors. The control signal includes a second control signal. Wherein: the second control signal is used to: control at least one second equivalent capacitor among the multiple second equivalent capacitors to be connected in series with the input end of the first amplifier. When at least one second equivalent capacitor is connected in series with the input end of the first amplifier, the phase of the second RF signal is reduced. In an embodiment of the present application, when the phase of the second RF signal output by the first amplifier increases with the increase of the signal power of the input first RF signal, the phase of the first RF signal can be reduced after at least one second equivalent capacitor is connected in series with the input end of the first amplifier. After the first RF signal with reduced phase is input into the first amplifier, the AM-PM distortion generated by the first amplifier can be compensated to output a second RF signal with a stable phase.

[0013] Exemplarily, the multiple equivalent capacitors also include multiple first equivalent capacitors. The control signal includes a first control signal. Wherein: the first control signal is used to: control at least one first equivalent capacitor among the multiple first equivalent capacitors to be connected in parallel with the input end of the first amplifier. When at least one first equivalent capacitor is connected in parallel with the input end of the first amplifier, the phase of the second RF signal increases. In an embodiment of the present application, when the phase of the second RF signal output by the first amplifier increases with the increase of the signal power of the input first RF signal, when at least one first equivalent capacitor among the multiple first equivalent capacitors is connected in parallel with the input end of the first amplifier, the phase of the initial RF signal can be increased. On the basis of reducing the phase of the first RF signal by at least one second equivalent capacitor, the phase of the first RF signal is fine-tuned and increased based on at least one first equivalent capacitor, so as to make a more precise adjustment of the AM-PM distortion generated by the first amplifier.

[0014] In a possible implementation, at least one first equivalent capacitor and at least one second equivalent capacitor are also used to: adjust the magnitude of the first impedance to be equal to the magnitude of the second impedance, and adjust the phase of the first impedance to be equal to the phase of the second impedance. The first impedance is the pre-stage load impedance of the first amplifier; the second impedance is the system transmission impedance of the power amplifier. In the embodiment of the present application, the radio frequency signal belongs to a high-frequency signal. In the application circuit of the high-frequency signal, the impedance matching of the radio frequency signal transmission needs to be considered when designing the circuit. Impedance matching is mainly used on the transmission line to achieve the purpose that all high-frequency radio frequency signals can be transmitted to the load point, and there is almost no radio frequency signal reflected back to the source point during the transmission process, so as to improve the efficiency of energy utilization. Impedance matching can be understood as the characteristic impedance of the transmission line being equal to the magnitude and phase of the connected load impedance, which is respectively referred to as the input end or output end of the transmission line being in an impedance matching state, referred to as impedance matching. In the embodiment of the present application, the first impedance is the pre-stage load impedance of the first amplifier (i.e., the connected load impedance). The second impedance is the system transmission impedance of the power amplifier (i.e., the characteristic impedance of the transmission line used to transmit the radio frequency signal). When the first impedance is equal to the second impedance, the radio frequency signal can be transmitted without reflection on the transmission path. When the first impedance is not equal to the second impedance, the RF signal will be reflected on the transmission path, generating interference signals and reducing the transmission efficiency of the RF signal. The embodiment of the present application combines at least one first equivalent capacitor and at least one second equivalent capacitor to achieve impedance matching of the power amplifier.

[0015] In a possible implementation, the capacitance of at least one first equivalent capacitor is not greater than the capacitance of at least one second equivalent capacitor, or the capacitance of at least one first equivalent capacitor is not less than the capacitance of at least one second equivalent capacitor. In an embodiment of the present application, in a practical application, the capacitance of the equivalent capacitor is designed according to the phase nonlinear characteristics of the power amplifier in the practical application. For example, when the AM-PM nonlinear distortion of the first amplifier is manifested as a decrease in phase as the input power increases, the capacitance of at least one first equivalent capacitor can be designed to be not greater than the capacitance of at least one second equivalent capacitor. At this time, the degree of change of the phase by at least one first equivalent capacitor is greater than the degree of change of the phase by at least one second equivalent capacitor, and the phase of the second RF signal can be increased based on the predistorter. When the AM-PM nonlinear distortion of the first amplifier is manifested as an increase in phase as the input power increases, the capacitance of at least one first equivalent capacitor can be designed to be not less than the capacitance of at least one second equivalent capacitor. At this time, the degree of change of the phase by at least one second equivalent capacitor is greater than the degree of change of the phase by at least one first equivalent capacitor, and the phase of the second RF signal can be reduced based on the predistorter. According to actual application requirements, corresponding capacitance values ​​may be set for the first equivalent capacitor and the second equivalent capacitor to achieve accurate compensation for AM-PM distortion.

[0016] Exemplarily, the capacitances of the plurality of first equivalent capacitors may be all equal or partially equal, or the capacitances of the plurality of first equivalent capacitors may be all different.

[0017] Exemplarily, the capacitances of the plurality of second equivalent capacitors may be all equal or partially equal, or the capacitances of the plurality of second equivalent capacitors may be all different.

[0018] Exemplarily, the ratio of the capacitance of at least one first equivalent capacitor to the capacitance of at least one second equivalent capacitor is 1:15. In an embodiment of the present application, when the phase of the second RF signal output by the first amplifier decreases as the signal power of the input first RF signal increases, the ratio of the capacitance of at least one first equivalent capacitor to the capacitance of at least one second equivalent capacitor can be set to 1:15. For example, the capacitance of the first equivalent capacitor is 50 femtofarads (fF), and the corresponding capacitance of the second equivalent capacitor is 750 femtofarads (fF). At this time, the phase of the first RF signal is mainly increased by the first equivalent capacitor to increase the phase of the second RF signal. The second equivalent capacitor has limited influence on the phase. At this time, the second equivalent capacitor is mainly used in combination with the first equivalent capacitor to achieve impedance matching.

[0019] In a possible implementation, the power amplifier further includes a detection circuit control circuit. The input end of the detection circuit is coupled to the input end of the first amplifier or the output end of the first amplifier. The output end of the detection circuit is coupled to the input end of the control circuit. The output end of the control circuit is coupled to the controlled end of the predistorter; wherein: when the input end of the detection circuit is coupled to the output end of the first amplifier, the detection circuit is used to: output a first voltage signal to the control circuit according to the second radio frequency signal. The voltage value of the first voltage signal is used to indicate the signal power of the second radio frequency signal. When the input end of the detection circuit is coupled to the input end of the first amplifier, the detection circuit is used to: output a first voltage signal to the control circuit according to the first radio frequency signal; the voltage value of the first voltage signal is used to indicate the signal power of the first radio frequency signal. The control circuit is used to: output a control signal to the predistorter according to the first voltage signal. In an embodiment of the present application, the degree of distortion of the AM-PM distortion of the power amplifier is related to the power operating range of the power amplifier. The first voltage signal can be obtained by the signal power of the first radio frequency signal or the signal power of the second radio frequency signal. The voltage value of the first voltage signal can indicate the power operating range of the power amplifier. The control circuit generates a control signal according to the first voltage signal to control the number of at least one first equivalent capacitor and / or at least one second equivalent capacitor that is turned on.

[0020] In a possible implementation, the predistorter further includes a second amplifier; the output end of the second amplifier is coupled to the input end of the first amplifier. Wherein: the second amplifier is used to: input an initial RF signal, and output a first RF signal. The signal power of the first RF signal is in a nonlinear coefficient amplification relationship with the signal power of the initial RF signal. The signal power of the second RF signal is in a linear coefficient amplification relationship with the signal power of the initial RF signal. In an embodiment of the present application, the second amplifier is a digital predistorter. AM-AM distortion can be compensated by a digital predistorter. The magnitude of the signal power is related to the magnitude of the signal amplitude. By compensating for the amplitude nonlinear distortion, the signal power of the second RF signal is in a linear coefficient amplification relationship with the signal power of the initial RF signal, that is, the AM-AM distortion is compensated.

[0021] In a second aspect, an embodiment of the present application further provides a control method, which is applied to a power amplifier, wherein the power amplifier includes a predistorter and a first amplifier. The predistorter includes a plurality of equivalent capacitors. The control method includes: the first amplifier inputs a first radio frequency signal and outputs a second radio frequency signal. A control signal is sent to the predistorter. The control signal is used to control at least one equivalent capacitor among the plurality of equivalent capacitors to be connected to the input end of the first amplifier. When the equivalent capacitor is connected to the input end of the first amplifier, the phase of the second radio frequency signal changes.

[0022] In a possible implementation, the multiple equivalent capacitors include multiple first equivalent capacitors. The control signal includes a first control signal. The first control signal is used to control at least one first equivalent capacitor among the multiple first equivalent capacitors to be connected in parallel with the input end of the first amplifier. When at least one first equivalent capacitor is connected in parallel with the input end of the first amplifier, the phase of the second RF signal increases.

[0023] In a possible implementation, the plurality of equivalent capacitors include a plurality of second equivalent capacitors. The control signal includes a second control signal. The second control signal is used to control at least one second equivalent capacitor among the plurality of second equivalent capacitors to be connected in series with the input end of the first amplifier. When at least one second equivalent capacitor is connected in series with the input end of the first amplifier, the phase of the second RF signal decreases.

[0024] In a possible implementation, the plurality of equivalent capacitors include a plurality of second equivalent capacitors. The control signal includes a second control signal. The first control signal is used to control at least one first equivalent capacitor among the plurality of first equivalent capacitors to be connected in parallel with the input end of the first amplifier. The control method further includes: adjusting the magnitude of the first impedance to be equal to the magnitude of the second impedance based on the first control signal and the second control signal, and the phase of the first impedance to be equal to the phase of the second impedance. The first impedance is the front-stage load impedance of the first amplifier. The second impedance is the system transmission impedance of the power amplifier.

[0025] In a possible implementation, the capacitance of at least one first equivalent capacitor is not greater than the capacitance of at least one second equivalent capacitor, or the capacitance of at least one first equivalent capacitor is not less than the capacitance of at least one second equivalent capacitor.

[0026] In a possible implementation manner, a ratio of a capacitance of at least one first equivalent capacitor to a capacitance of at least one second equivalent capacitor is 1:15.

[0027] In a possible implementation, the outputting of the control signal to the predistorter includes: obtaining a first voltage signal according to the first RF signal. The voltage value of the first voltage signal is used to indicate the signal power of the first RF signal. Alternatively, obtaining the first voltage signal according to the second RF signal. The first voltage signal is used to indicate the signal power of the second RF signal. Outputting the control signal to the predistorter according to the first voltage signal.

[0028] In a third aspect, an embodiment of the present application further provides a signal transmission system, the signal transmission system comprising a radio frequency generation circuit and the power amplifier described in the first aspect. The output end of the radio frequency generation circuit is coupled to the input end of the power amplifier. The radio frequency generation circuit is used to output an initial radio frequency signal to the power amplifier. The power amplifier is used to: output a second radio frequency signal according to the initial radio frequency signal. The signal power of the second radio frequency signal is in a gain amplification relationship with the signal power of the initial radio frequency signal.

[0029] In a fourth aspect, an embodiment of the present application further provides an electronic device, the electronic device comprising a baseband processing system and the signal transmission system described in the third aspect. The output end of the baseband processing system is coupled to the input end of the signal transmission system.

[0030] In a fifth aspect, an embodiment of the present application further provides a computer-readable storage medium, the computer-readable storage medium comprising instructions. When the instructions are executed on a processor, the processor executes the control method as described in the first aspect.

[0031] Regarding the technical principles and beneficial effects of the second, third, fourth and fifth aspects, reference may be made to the relevant description of the first aspect and no further details will be given here. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application;

[0033] Figure 2 A schematic diagram of the structure of a signal transmission system provided in an embodiment of the present application;

[0034] Figure 3 A schematic diagram showing the variation of the nonlinear distortion of a power amplifier with the power operating range provided in an embodiment of the present application;

[0035] Figure 4 A schematic diagram of the structure of a second power amplifier provided in an embodiment of the present application Figure 1 ;

[0036] Figure 5 A schematic diagram showing the variation of the nonlinear distortion of a predistorter according to an embodiment of the present application with respect to the power operating range;

[0037] Figure 6 A schematic diagram of another structure of a second power amplifier provided in an embodiment of the present application Figure 2 ;

[0038] Figure 7 A schematic diagram of the effect of AM-PM distortion compensation when the output phase of the first amplifier decreases with power provided by an embodiment of the present application;

[0039] Figure 8 A schematic diagram of the effect of AM-PM distortion compensation when the output phase of the first amplifier increases with power provided by an embodiment of the present application;

[0040] Fig. 9 A schematic diagram of the structure of another second power amplifier provided in an embodiment of the present application Figure 3 ;

[0041] Fig.10 A schematic diagram of the structure of another second power amplifier provided in an embodiment of the present application Figure 4 ;

[0042] Fig.11 A schematic diagram of the structure of another second power amplifier provided in an embodiment of the present application Figure 5 ;

[0043] Fig.12 A schematic diagram of the structure of another second power amplifier provided in an embodiment of the present application Figure 6 ;

[0044] Fig.13 A schematic diagram of the structure of another second power amplifier provided in an embodiment of the present application Figure 7 ;

[0045] Fig.14 A schematic diagram of the structure of another second power amplifier provided in an embodiment of the present application Figure 8 ;

[0046] Fig.15 A flow chart of a control method provided in an embodiment of the present application;

[0047] Fig.16 A schematic diagram of a phase adjustment effect with different first capacitance ratios provided in an embodiment of the present application;

[0048] Fig.17 A schematic diagram of an AM-PM distortion compensation effect of a second power amplifier after a third predistorter is provided in an embodiment of the present application. DETAILED DESCRIPTION

[0049] It should be noted that the terms "first", "second", etc. involved in the embodiments of the present application are only used to distinguish features of the same type and cannot be understood as indicating relative importance, quantity, order, etc.

[0050] The terms "exemplary" or "for example" and the like in the embodiments of the present application are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of the terms "exemplary" or "for example" is intended to present the related concepts in a specific way.

[0051] The terms "coupling" and "connection" involved in the embodiments of the present application should be understood in a broad sense. For example, they may refer to a direct physical connection, or an indirect connection achieved through electronic devices, such as a connection achieved through resistors, inductors, capacitors or other electronic devices.

[0052] The present application embodiment provides an electronic device, such as Figure 1 As shown, the electronic device 10000 includes a baseband processing system 1000 and a signal transmission system 2000. The output end of the baseband processing system 1000 is coupled to the input end of the signal transmission system 2000. The baseband processing system 1000 is used to output a baseband signal to the signal transmission system 2000. The baseband signal carries data information. The signal transmission system 2000 is used to transmit a radio frequency signal according to the baseband signal. The radio frequency signal carries data information. Figure 2 As shown, the signal transmission system 2000 includes a radio frequency generation circuit 100 and a power amplifier 200. The output end of the radio frequency generation circuit 100 is coupled to the input end of the power amplifier 200. The radio frequency generation circuit 100 is used to output an initial radio frequency signal to the power amplifier 200.

[0053] In some possible implementations, the power amplifier 200 is a first power amplifier. The first power amplifier is used to: output a second RF signal according to the initial RF signal. The signal power of the second RF signal is in a gain amplification relationship with the signal power of the initial RF signal. Figure 3 As shown, the first power amplifier has a certain linear operating range. When the input power is at a higher power position in the linear operating range, nonlinear distortion may be generated on the second RF signal output by the first power amplifier. Under the influence of nonlinear distortion, harmonic components and intermodulation components, etc. will be generated on the second RF signal. These component signals are interference signals in the power amplification process. As the input power of the first power amplifier increases to the nonlinear range or even the saturation range, these component signals will generate greater interference, and even cause the data communication based on the second RF signal to fail to be implemented normally.

[0054] In order to solve the Figure 2 The nonlinear distortion generated by the power amplifier 200 shown in FIG. Figure 2The power amplifier 200 shown is a second power amplifier. Figure 4 As shown, the second power amplifier 200B includes a predistorter 10 and a first amplifier 20. The predistorter 10 is used to input an initial RF signal, obtain a first RF signal based on the initial RF signal, and output the first RF signal to the first amplifier 20. The first RF signal has a nonlinear characteristic. The first amplifier 20 outputs a second RF signal according to the first RF signal. The signal power of the second RF signal is in a linear gain amplification relationship with the signal power of the initial RF signal. In the embodiment of the present application, Figure 3 As shown, it is a curve of the change of the input power and output power of the first amplifier 20. When the first amplifier 20 is in the low-power linear working range, the nonlinear distortion is small, and the input power and output power of the first amplifier 20 present a linear gain amplification. When the first amplifier 20 is in the medium-power nonlinear working range, the amplification gain of the first amplifier 20 gradually decreases, and the nonlinear distortion increases. When the first amplifier 20 is in the high-power saturated working range, the amplification gain of the first amplifier 20 drops to the minimum (that is, the gain coefficient approaches 1, and it is difficult to achieve amplification), and the nonlinear distortion reaches the maximum at this time. In order to compensate for the nonlinear distortion generated by the first amplifier 20. As Figure 5 As shown, a first RF signal is generated according to an initial RF signal by a predistorter 10. A nonlinear distortion characteristic is applied to the first RF signal. In the low-power working range of the predistorter 10, a smaller nonlinear distortion characteristic is applied to the first RF signal to compensate for the nonlinearity of the low-power linear working range of the first amplifier 20. In the medium-power working range of the predistorter 10, a larger nonlinear distortion characteristic is applied to the first RF signal to compensate for the nonlinearity of the medium-power nonlinear working range of the first amplifier 20. In the high-power working range of the predistorter 10, a larger degree of nonlinear distortion characteristic is applied to the first RF signal to compensate for the nonlinearity of the high-power saturation working range of the first amplifier 20. In practical applications, nonlinear distortion is divided into two types: amplitude-amplitude distortion (AM-AM distortion) that increases with the increase of signal amplitude, and amplitude-phase distortion (AM-PM distortion) that increases with the increase of signal amplitude. Generally, the predistorter 10 only considers the compensation of AM-AM distortion in the process of linear compensation of the amplification gain. The compensation of AM-PM distortion is not considered. The predistorter 10 is usually implemented based on a digital predistortion (DPD). There are relatively few analog predistortions (APDs) that can compensate for AM-PM distortion.

[0055] In order to realize compensation for AM-PM distortion based on analog predistorter, in some possible implementations, such as Figure 4The predistorter 10 shown can be a first predistorter based on a Schottky diode. The first predistorter based on a Schottky diode mainly utilizes the nonlinear characteristics generated by the Schottky diode working in the saturation range to compensate for the nonlinear characteristics of the first amplifier 20. Specifically, the radio frequency impedance of the Schottky diode will show nonlinear changes as the signal power of the input signal changes, and a bias voltage is applied to the Schottky diode. According to the input power or output power of the first amplifier 20, the bias voltage output to the Schottky diode is dynamically adjusted. This makes the nonlinear change characteristics of the Schottky diode and the nonlinear characteristics of the first amplifier 20 have opposite change characteristics. That is, compensation for the AM-AM distortion and compensation for the AM-PM distortion of the first amplifier 20 is achieved. However, in the embodiment of the present application, the first predistorter based on the Schottky diode is suitable for the first amplifier 20 which is a gallium nitride (GaN) power tube amplifier or a gallium arsenide (GaAs) power tube amplifier, for example: the first amplifier 20 is a GaN-based and / or GaAs-based solid-state power amplifier (SSPA) or a traveling wave tube power amplifier (TWPA). However, the first predistorter based on the Schottky diode is not suitable for the first amplifier 20 based on the CMOS process. In addition, the Schottky diode is an independent discrete device. The first predistorter based on the Schottky diode also needs to set up multiple peripheral circuits, and integrate the multiple peripheral circuits with the Schottky diode to obtain the first predistorter for supplementing the nonlinear distortion. Therefore, the system integration of the first predistorter based on the Schottky diode is poor.

[0056] In order to improve the system integration of analog predistorter, such as Figure 4 The predistorter 10 shown can be a second predistorter based on an intermodulation generator. The second predistorter based on the intermodulation generator includes a power divider, a phase shifter, a vector modulator, a power combiner, etc. The input RF signal is divided into multiple channels by a power divider, and at least one of the multiple RF signals is processed based on the phase shifter and the vector modulator to generate nonlinear characteristics, and finally the multiple RF signals are synthesized by a power combiner. Compared with the first predistorter, the second predistorter based on the intermodulation generator has a smaller structural area and a high system integration. However, the second predistorter is equipped with devices such as a power divider, a phase shifter, a vector modulator, and a power combiner, which greatly increases the cost of the hardware.

[0057] In order to improve the system integration of the analog predistorter and obtain the first amplifier 20 applicable to various processes (such as CMOS process, GaN process, GaAs process, etc.) without increasing the hardware cost, in some possible implementations, as Figure 4 The predistorter 10 shown may be a third predistorter based on capacitance compensation. Figure 6 As shown, the third predistorter 10C is coupled to the input end of the first amplifier 20. The third predistorter 10C includes a plurality of equivalent capacitors. The plurality of equivalent capacitors form a capacitor array Z. The third predistorter 10C is used to input a control signal; the control signal is used to control at least one equivalent capacitor among the plurality of equivalent capacitors to be connected to the input end of the first amplifier 20. When the equivalent capacitor is connected to the input end of the first amplifier 20, the phase of the second RF signal changes.

[0058] In an embodiment of the present application, a third predistorter 10C is provided in the front stage of the first amplifier 20. A plurality of equivalent capacitors are provided in the third predistorter 10C. When the plurality of equivalent capacitors in the third predistorter 10C are not connected to the input end of the first amplifier 20, the initial RF signal input by the second power amplifier 200B will not be affected by the third predistorter 10C, and the initial RF signal is input into the first amplifier 20 as the first RF signal to obtain a second RF signal. Due to the nonlinear characteristics of the first amplifier 20, AM-PM distortion exists on the second RF signal at this time. When at least one equivalent capacitor among the plurality of equivalent capacitors is controlled to be connected to the input end of the first amplifier 20 by a control signal, the capacitance characteristics of at least one equivalent capacitor after being connected will cause the phase of the initial RF signal to change, and a first RF signal with a phase nonlinear characteristic will be obtained. After the first RF signal with a phase nonlinear characteristic is input into the first amplifier 20, the phase nonlinear characteristic on the first RF signal will compensate for the phase nonlinear characteristic of the first amplifier 20, so that the phase of the output second RF signal changes. By adjusting the number of equivalent capacitors turned on according to the current operating power range of the first amplifier 20 through a control signal, the phase of the output second RF signal can be kept consistent with the phase of the initial RF signal, thereby achieving compensation for AM-PM distortion.

[0059] In some implementations, the phase nonlinear characteristics of the first amplifier 20 vary with the input power, depending on the process on which the first amplifier 20 is based. In some examples, when the first amplifier 20 is a power amplifier based on a CMOS process, or a traveling wave parametric amplifier (TWPA) based on GaN and / or GaAs, Figure 7 As shown in Figure (a), the phase of the second RF signal decreases as the signal power of the input first RF signal increases. Figure 7As shown in Figure (b), it is a curve of the phase nonlinearity of the third predistorter 10C changing with the input power. At this time, it is necessary to increase the phase of the initial RF signal through the third predistorter 10C to obtain a first RF signal with an increased phase. And the phase nonlinearity of the first amplifier 20 is compensated by the first RF signal after the phase is increased, so that the phase change of the second RF signal output by the first amplifier 20 is as shown in FIG. Figure 7 In some examples, when the first amplifier 20 is a GaN-based and / or GaAs-based solid state power amplifier (SSPA), as shown in FIG. Figure 8 As shown in Figure (a), the phase of the second RF signal increases as the signal power of the input first RF signal increases. Figure 8 As shown in FIG. (b), the phase of the initial RF signal needs to be reduced by the third predistorter 10C to obtain the first RF signal. The first RF signal after reducing the phase of the initial RF signal is used to compensate for the phase nonlinearity of the first amplifier 20, so that the phase change of the second RF signal output by the first amplifier 20 is as shown in FIG. Figure 8 As shown in Figure (c).

[0060] In some possible implementations, when the phase nonlinear characteristic of the first amplifier 20 changes as follows Figure 7 As shown in Figure (a). Fig. 9 As shown, the multiple equivalent capacitors include multiple first equivalent capacitors C1; the control signal includes a first control signal. The first control signal is used to control at least one first equivalent capacitor C1 among the multiple first equivalent capacitors C1 to be connected in parallel with the input end of the first amplifier 20. When at least one first equivalent capacitor C1 is connected in parallel with the input end of the first amplifier 20, the phase of the second RF signal increases.

[0061] Exemplarily, the third predistorter 10C may include a plurality of first switches S1, and the plurality of first equivalent capacitors C1 are coupled in parallel with the input end of the first amplifier 20 through the plurality of first switches S1. The first control signal controls at least one first switch S1 among the plurality of first switches S1 to be turned on, so as to control the corresponding at least one first equivalent capacitor C1 to be turned on in parallel with the input end of the first amplifier 20.

[0062] In some possible implementations, based on Fig. 9 The embodiment shown, as Fig.10As shown, the multiple equivalent capacitors also include multiple second equivalent capacitors C2. The control signal includes a second control signal. Wherein: the second control signal is used to: control at least one second equivalent capacitor C2 among the multiple second equivalent capacitors C2 to be connected in series with the input end of the first amplifier 20. When at least one second equivalent capacitor C2 is connected in series with the input end of the first amplifier 20, the phase of the second RF signal is reduced. In an embodiment of the present application, when at least one second equivalent capacitor C2 among the multiple second equivalent capacitors C2 is connected in series with the input end of the first amplifier 20, the phase of the initial RF signal can be reduced to obtain a first RF signal with a reduced phase.

[0063] Exemplarily, the third predistorter 10C may include a plurality of second switches S2, and the plurality of second equivalent capacitors C2 are coupled in series with the input end of the first amplifier 20 through the plurality of second switches S2. The first control signal controls at least one second switch S2 among the plurality of second switches S2 to be turned on, so as to control the corresponding at least one first equivalent capacitor C1 to be turned on in parallel with the input end of the first amplifier 20.

[0064] In some possible implementations, when the phase nonlinear characteristic of the first amplifier 20 changes as follows Figure 8 As shown in Figure (a). Fig.11 As shown, the multiple equivalent capacitors include multiple second equivalent capacitors C2. The control signal includes a second control signal. Wherein: the second control signal is used to control at least one second equivalent capacitor C2 among the multiple second equivalent capacitors C2 to be connected in series with the input end of the first amplifier 20. When at least one second equivalent capacitor C2 is connected in series with the input end of the first amplifier 20, the phase of the second RF signal decreases.

[0065] As described in the previous embodiment of the first predistorter, the Schottky diode is difficult to be compatible with the first amplifier 20 formed by CMOS process. At the same time, the Schottky diode needs to be combined with a large number of peripheral circuits to form the first predistorter, so the system integration of the second power amplifier 200B using the first predistorter is poor. Fig. 9 , Fig.10 and Fig.11In the embodiment shown, the third predistorter 10C only needs an equivalent capacitor to realize the function of AM-PM distortion compensation, and its hardware cost is low. And when the first amplifier 20 is a power amplifier based on CMOS technology, a power amplifier based on GaN technology, a power amplifier based on GaAs technology, etc., it is possible to integrate multiple equivalent capacitors in the third predistorter 10C and the first amplifier 20 into one chip. The capacitor is essentially a bipolar structure formed by a metal plate or a metal wire. Therefore, the capacitor array Z composed of multiple equivalent capacitors can be compatible with a variety of different processes and processed in one chip device, thereby improving the system integration of the second power amplifier 200B using the third predistorter 10C.

[0066] In some possible implementations, when the phase nonlinear characteristic of the first amplifier 20 changes as follows Figure 8 As shown in Figure (a), based on Fig.11 The embodiment shown, as Fig.10 As shown, the multiple equivalent capacitors also include multiple first equivalent capacitors C1. The control signal includes a first control signal. Wherein: the first control signal is used to control at least one first equivalent capacitor C1 among the multiple first equivalent capacitors C1 to be connected in parallel with the input end of the first amplifier 20. When at least one first equivalent capacitor C1 is connected in parallel with the input end of the first amplifier 20, the phase of the second RF signal increases.

[0067] In some examples, a control signal may be generated based on the baseband processing system 1000 and output to the third predistorter 10C of the second power amplifier 200B.

[0068] In some examples, such as Fig.12 As shown, the second power amplifier 200B also includes a detection circuit 30 and a control circuit 40. The input end of the detection circuit 30 is coupled to the output end of the first amplifier 20. The output end of the detection circuit 30 is coupled to the input end of the control circuit 40. The output end of the control circuit 40 is coupled to the controlled end of the third predistorter 10C. Wherein: the detection circuit 30 is used to: output a first voltage signal to the control circuit 40 according to the second radio frequency signal. The voltage value of the first voltage signal is used to indicate the signal power of the second radio frequency signal. The control circuit 40 is used to: output a control signal to the third predistorter 10C according to the first voltage signal. Exemplarily, a second radio frequency signal can be divided from the output end of the first amplifier 20 to the input end of the detection circuit 30 by a splitter, a coupler, etc.

[0069] In some examples, such as Fig.13As shown, the second power amplifier 200B also includes a detection circuit 30 and a control circuit 40. The input end of the detection circuit 30 is coupled to the input end of the first amplifier 20. The output end of the detection circuit 30 is coupled to the input end of the control circuit 40. The output end of the control circuit 40 is coupled to the controlled end of the third predistorter 10C. Wherein: the detection circuit 30 is used to: output a first voltage signal to the control circuit 40 according to the first radio frequency signal. The voltage value of the first voltage signal is used to indicate the signal power of the first radio frequency signal. The control circuit 40 is used to: output a control signal to the third predistorter 10C according to the first voltage signal. Exemplarily, a first radio frequency signal can be divided from the input end of the first amplifier 20 to the input end of the detection circuit 30 by a splitter, a coupler, etc.

[0070] In some examples, such as Fig.12 and Fig.13 The control circuit 40 shown may be a digital logic control circuit. A digital logic control circuit is established by mapping the power operating range of the first amplifier 20 with at least one first equivalent capacitor C1 and at least one second equivalent capacitor C2. The digital logic control circuit generates a control signal of multiple bits according to the first voltage signal, and each bit of the control signal is used to control a first equivalent capacitor C1 or a first second equivalent capacitor C2 to couple with the input end of the first amplifier 20.

[0071] In some examples, such as Fig.12 and Fig.13 The control circuit 40 shown may be a controller that generates a corresponding control signal according to an input first voltage signal.

[0072] In some possible implementations, such as Fig.12 and Fig.13 As shown, the third predistorter 10C further includes a second amplifier 1C. The output terminal of the second amplifier 1C is coupled to the input terminal of the first amplifier 20.

[0073] In some examples, the second amplifier 1C may be a preamplifier for adjusting the signal amplitude or signal power of the initial RF signal. In the embodiment of the present application, the signal amplitude or signal power of the initial RF signal may be adjusted by the second amplifier 1C as a preamplifier, so that the multiple equivalent capacitors of the subsequent stage and the first amplifier 20 can perform power amplification better.

[0074] In some examples, the second amplifier 1C may be a digital predistorter. In the embodiment of the present application, the amplitude-amplitude distortion characteristic of the first amplifier 20 may be compensated by the second amplifier 1C being a digital predistorter, that is, the AM-AM distortion may be compensated by the second amplifier 1C being a digital predistorter. For example, Fig.14As shown, the second amplifier 1C can be an amplifier based on a fully differential Cascode cascade structure. In the fully differential Cascode cascade structure, there are two positive and negative input terminals and two positive and negative output terminals, and the first amplifier 20 is also provided with two positive and negative input terminals and two positive and negative output terminals. Multiple first equivalent capacitors C1 and / or multiple second equivalent capacitors C2 are coupled to the positive input terminal and the negative input terminal of the first amplifier 20. AM-AM distortion is compensated by the second amplifier 1C. AM-PM distortion is compensated by multiple first equivalent capacitors C1 and / or multiple second equivalent capacitors C2. In some examples, when at least one first equivalent capacitor C1 and at least one second equivalent capacitor C2 are turned on, the impedance between the second amplifier 1C and the first amplifier 20 can also be adjusted to achieve impedance matching. Fig.14 In the embodiment, INP1 and INN1 are respectively the positive input terminal and the negative input terminal of the second amplifier 1C, and are used to input the initial RF signal. OUTP1 and OUTN1 are respectively the positive output terminal and the negative output terminal of the second amplifier 1C, and are used to output the first RF signal subjected to AM-AM distortion processing. VB1 and VB2 are bias voltage terminals, and are used to input bias voltage. The bias voltage can adjust the nonlinear distortion coefficient of the second amplifier 1C to adjust the compensation accuracy of AM-AM distortion. At least one first equivalent capacitor C1 and at least one second equivalent capacitor C2 that are turned on perform AM-PM distortion compensation processing on the first RF signal subjected to AM-AM distortion processing, and obtain the first RF signal subjected to AM-AM distortion processing and AM-PM distortion processing. After the first RF signal subjected to AM-AM distortion compensation and AM-PM distortion compensation is input to the positive input terminal and the accessory input terminal of the first amplifier 20, the second RF signal is output. Since the input first RF signal carries the AM-AM distortion characteristic and the AM-PM distortion characteristic, the nonlinear distortion characteristic of the first amplifier 20 is compensated by the AM-AM distortion characteristic and the AM-PM distortion characteristic to obtain the second RF signal. OUTP2 and OUTN2 are respectively the positive output terminal and the negative output terminal of the first amplifier 20, which are used to output the second RF signal. The second RF signal has a linear gain amplification relationship with the initial RF signal, and the phase change of the second RF signal is consistent with that of the initial RF signal.

[0075] In the embodiment of the present application, the digital predistorter is formed by the second amplifier 1C, and the capacitor array Z formed by multiple equivalent capacitors forms an analog predistorter. At this time, the third predistorter 10C is a hybrid predistorter based on the digital predistorter and the analog predistorter. The capacitor array Z formed by the first equivalent capacitor C1 and the second equivalent capacitor C2 can realize the compatible fusion of the digital predistorter and the analog predistorter to improve the compensation effect of nonlinear distortion.

[0076] In some possible implementations, the linearity of the first amplifier 20 may be improved to reduce the nonlinear distortion of the first amplifier 20. Fig.14 As shown, the first amplifier 20 includes a pre-stage amplifier circuit 21, an inter-stage matching circuit 22, a linearization stage amplifier circuit 23 and an output matching circuit 24. In the pre-stage amplifier circuit 21, the input first RF signal is filtered by capacitors C3 and C4. The nonlinear distortion of the power tubes M2 and M3 is compensated by capacitors C5 and C6. The drains of transistors M1 and M4 are used to output the RF signal after power amplification of the pre-stage amplifier circuit 21. Resistors R1 and R2 are used to input voltage Vb and divide the voltage to obtain gate bias voltage to the gate of the power tube M2 and the gate of the power tube M3. Inductors L are provided in the pre-stage amplifier circuit 21, the inter-stage matching circuit 22 and the output matching circuit 24. The inductor L is used as a load device to achieve impedance matching in the first amplifier 20. For example, the capacitor C7 and two inductors L in the inter-stage matching circuit 22 achieve impedance matching between the pre-stage amplifier circuit 21 and the linearization stage amplifier circuit 23. The inductor L and the capacitor C15 in the output matching circuit 24 are used to achieve output impedance matching of the first amplifier 20. The linearization stage amplifier circuit 23 includes a first multi-gate transistor (MGTR) amplifier circuit MGTR1 and a second multi-gate amplifier circuit MGTR2. The received radio frequency signal is power amplified by the first multi-gate transistor amplifier circuit MGTR1 and the second multi-gate amplifier circuit MGTR2, and the second radio frequency signal is output through the output matching circuit 24. The use of the first multi-gate transistor amplifier circuit MGTR1 and the second multi-gate amplifier circuit MGTR2 in the linearization stage amplifier circuit 23 can improve the linearity of the first amplifier 20. The capacitor C8, the capacitor C9, the capacitor C10 and the capacitor C11 are used to read the radio frequency signal input by the linearization stage amplifier circuit 23 for filtering. The interference signal is filtered out by the transistor M5, the transistor M6 and the capacitor C14.

[0077] Exemplarily, the baseband processing system 1000 may be a baseband processing unit (base band unit, BBU).

[0078] Exemplarily, the signal transmission system 2000 may be a remote radio unit (RRU), an active antenna unit (AAU), or the like.

[0079] For example, the electronic device 10000 may be a signal transmitting device based on wireless fidelity (Wi-Fi) technology, or a signal transmitting device based on cellular network or mobile network technology. In some examples, the electronic device 10000 is a base station, a terminal device, a mobile phone, a notebook circuit, a tablet circuit, a smart watch, a smart home device, a smart car, etc.

[0080] Based on the above Figure 6 , Fig. 9 , Fig.10 , Fig.11 , Fig.12 , Fig.13 and Fig.14 The electronic device 10000 of the structure can perform the following Fig.15 The control method shown includes steps S110 to S120:

[0081] S110 , the first amplifier 20 inputs a first radio frequency signal and outputs a second radio frequency signal.

[0082] In the embodiment of the present application, the first amplifier 20 performs power amplification according to the input first RF signal to obtain a second RF signal. When the power operating range of the first amplifier 20 changes accordingly, the second RF signal generated by the first amplifier 20 has different degrees of AM-AM distortion and AM-PM distortion.

[0083] S120 . Send a control signal to the third predistorter 10C, and adjust the phase of the second radio frequency signal through the control signal.

[0084] In some possible implementations, the control signal is used to control at least one equivalent capacitor among the multiple equivalent capacitors to be connected to the input end of the first amplifier 20. When the equivalent capacitor is connected to the input end of the first amplifier 20, the phase of the second RF signal changes.

[0085] In some examples, when the phase nonlinear characteristic of the first amplifier 20 changes as follows Figure 7 As shown in Figure (a), if Fig. 9 As shown, the multiple equivalent capacitors include multiple first equivalent capacitors C1; the control signal includes a first control signal. The first control signal is used to control at least one first equivalent capacitor C1 among the multiple first equivalent capacitors C1 to be connected in parallel with the input end of the first amplifier 20. When at least one first equivalent capacitor C1 is connected in parallel with the input end of the first amplifier 20, the phase of the second RF signal increases. In the embodiment of the present application, when the phase nonlinear characteristic of the first amplifier 20 changes as shown in FIG. Figure 7As shown in FIG. (a), at least one first equivalent capacitor C1 can be connected in parallel with the input end of the first amplifier 20 for conduction. The at least one first equivalent capacitor C1 after conduction can increase the phase of the first RF signal, thereby increasing the phase of the second RF signal. The phase of the first RF signal increased by the at least one first equivalent capacitor C1 can compensate for the reduction in the phase of the second RF signal caused by the phase nonlinearity of the first amplifier 20, so as to achieve compensation for the AM-PM distortion of the second RF signal.

[0086] Exemplarily, when the phase nonlinear characteristic of the first amplifier 20 changes as follows Figure 7 As shown in Figure (a), if Fig.10 As shown, the multiple equivalent capacitors also include multiple second equivalent capacitors C2. The control signal includes a second control signal. Wherein: the second control signal is used to: control at least one second equivalent capacitor C2 among the multiple second equivalent capacitors C2 to be connected in series with the input end of the first amplifier 20. When at least one second equivalent capacitor C2 is connected in series with the input end of the first amplifier 20, the phase of the second RF signal is reduced. In an embodiment of the present application, when at least one second equivalent capacitor C2 among the multiple second equivalent capacitors C2 is connected in series with the input end of the first amplifier 20, the phase of the initial RF signal can be reduced to obtain a first RF signal with a reduced phase. The embodiment of the present application can be used in the following manner: Fig. 9 In the embodiment shown, at least one first equivalent capacitor C1 increases the phase of the initial RF signal, and at least one second equivalent capacitor C2 is used to fine-tune and reduce the phase of the initial RF signal. As the working power range of the first amplifier 20 changes, the number of at least one first equivalent capacitor that is turned on and the number of at least one second equivalent capacitor that is turned on are adjusted to make the distortion compensation effect of AM-PM more accurate.

[0087] Exemplarily, when the phase nonlinear characteristic of the first amplifier 20 changes as follows Figure 7 As shown in Figure (a), if Fig.10 As shown, the capacitance of at least one first equivalent capacitor is not greater than the capacitance of at least one second equivalent capacitor. In the embodiment of the present application, the phase of the initial RF signal is increased by at least one first equivalent capacitor C1 to obtain the first RF signal, and on this basis, the phase of the initial RF signal is reduced by at least one second equivalent capacitor C2. However, the increase in the phase of the initial RF signal by at least one first equivalent capacitor C1 is greater than the decrease in the phase of the initial RF signal by at least one second equivalent capacitor C2, so as to compensate for the phase of the first amplifier 20 that decreases with the input power.

[0088] In some possible implementations, when the phase nonlinear characteristic of the first amplifier 20 changes as follows Figure 8 As shown in Figure (a), if Fig.11 As shown, the multiple equivalent capacitors include multiple second equivalent capacitors C2. The control signal includes a second control signal. Wherein: the second control signal is used to: control at least one second equivalent capacitor C2 among the multiple second equivalent capacitors C2 to be connected in series with the input end of the first amplifier 20. When at least one second equivalent capacitor C2 is connected in series with the input end of the first amplifier 20, the phase of the second RF signal is reduced. In the present application, Fig.11 In the embodiment shown, when the second equivalent capacitor C2 is connected in series with the input end of the first amplifier 20, the phase of the initial RF signal can be reduced to obtain a first RF signal with a reduced phase. As the operating power range of the first amplifier 20 increases, the number of at least one second equivalent capacitor C2 that is turned on is adjusted. This makes the phase nonlinear characteristics of the first RF signal change with the signal power as shown in FIG. Figure 8 As shown in Figure (b), compensation for the AM-PM distortion of the first amplifier 20 is achieved.

[0089] In some possible implementations, when the phase nonlinear characteristic of the first amplifier 20 changes as follows Figure 8 As shown in Figure (a), if Fig.10 As shown, the multiple equivalent capacitors also include multiple first equivalent capacitors C1. The control signal includes a first control signal. Wherein: the first control signal is used to: control at least one first equivalent capacitor C1 among the multiple first equivalent capacitors C1 to be connected in parallel with the input end of the first amplifier 20. When at least one first equivalent capacitor C1 is connected in parallel with the input end of the first amplifier 20, the phase of the second RF signal increases. In the embodiment of the present application, the embodiment of the present application can be as follows Fig.11 In the embodiment shown, the at least one second equivalent capacitor C2 reduces the phase of the initial RF signal, and the phase of the initial RF signal is fine-tuned and increased based on the at least one first equivalent capacitor C1. As the working power range of the first amplifier 20 changes, the number of the at least one first equivalent capacitor that is turned on and the number of the at least one second equivalent capacitor that is turned on are adjusted to make the distortion compensation effect of AM-PM more accurate.

[0090] In some possible implementations, based on Fig.11 The embodiment shown, as Fig.10 As shown, the multiple equivalent capacitors also include multiple first equivalent capacitors C1. The control signal includes a first control signal. Wherein: the first control signal is used to: control at least one first equivalent capacitor C1 among the multiple first equivalent capacitors C1 to be connected in parallel with the input end of the first amplifier 20. When at least one first equivalent capacitor C1 is connected in parallel with the input end of the first amplifier 20, the phase of the second RF signal increases. In the embodiment of the present application, the embodiment of the present application can be as follows Fig.11In the embodiment shown, the at least one second equivalent capacitor C2 reduces the phase of the initial RF signal, and the phase of the initial RF signal is fine-tuned and increased based on the at least one first equivalent capacitor C1. As the working power range of the first amplifier 20 changes, the number of the at least one first equivalent capacitor that is turned on and the number of the at least one second equivalent capacitor that is turned on are adjusted to make the distortion compensation effect of AM-PM more accurate.

[0091] Exemplarily, when the phase nonlinear characteristic of the first amplifier 20 changes as follows Figure 8 As shown in Figure (a), if Fig.10 As shown, the capacitance of at least one first equivalent capacitor is not less than the capacitance of at least one second equivalent capacitor.

[0092] In some examples, such as Fig.10 As shown, after the multiple first equivalent capacitors C1 are coupled in parallel with the input end of the first amplifier 20, the multiple second equivalent capacitors C2 are coupled in series with the input end of the first amplifier 20 at the subsequent stage of the multiple first equivalent capacitors C1. Although not shown in the figure, in some examples, the multiple first equivalent capacitors C1 and the multiple second equivalent capacitors C2 can be coupled to the input end of the first amplifier 20 at intervals. In some examples, after the multiple second equivalent capacitors C2 are coupled in series with the input end of the first amplifier 20, the multiple first equivalent capacitors C1 are coupled in parallel with the input end of the first amplifier 20 at the subsequent stage of the multiple second equivalent capacitors C2.

[0093] In some examples, such as Fig. 9 and Fig.10 As shown, the capacitances of the plurality of first equivalent capacitors C1 may be all or partially equal. Alternatively, the capacitances of the plurality of first equivalent capacitors C1 may be all unequal. In some examples, such as Fig.10 and Fig.11 As shown, the capacitances of the plurality of second equivalent capacitors C2 may be all or partially equal. Alternatively, the capacitances of the plurality of second equivalent capacitors C2 may be all unequal. In some examples, for a first equivalent capacitor C1 in at least one first equivalent capacitor C1 and a second equivalent capacitor C2 in at least one second equivalent capacitor C2, the phase change of the initial RF signal may be different depending on the capacitance of the at least one first equivalent capacitor and the capacitance of the at least one second equivalent capacitor. Fig.16 , which is a schematic diagram of the change of the phase nonlinear characteristic that can be applied to the first RF signal under different values ​​of the first capacitance ratio. The first capacitance ratio is the capacitance ratio between a first equivalent capacitance and a second equivalent capacitance. Fig.16In FIG. 1 , lines ① to ⑩ are schematic diagrams of AM-PM distortion compensation effects under ten different first capacitance ratios. The horizontal axis is the input power of the initial RF signal input by the third predistorter 10C. The vertical axis is the phase of the initial RF signal of the third predistorter 10C. It can be seen that as the input power of the initial RF signal increases, the phase change direction and the degree of phase change of the initial RF signal under different first capacitance ratios are different.

[0094] In some possible implementations, when the phase nonlinear characteristic of the first amplifier 20 changes as follows Figure 7 As shown in FIG. (a), and when the phase nonlinear characteristic of the first amplifier 20 changes as shown in FIG. Figure 8 As shown in Figure (a), if Fig.10 As shown, at least one first equivalent capacitor C1 and at least one second equivalent capacitor C2 are also used to: adjust the size of the first impedance to be equal to the size of the second impedance, and adjust the phase of the first impedance to be equal to the phase of the second impedance. The first impedance is the front-stage load impedance of the first amplifier 20; the second impedance is the system transmission impedance of the second power amplifier 200B. In the embodiment of the present application, the radio frequency signal belongs to a high-frequency signal. In the application circuit of the high-frequency signal, the impedance matching of the radio frequency signal transmission needs to be considered when designing the circuit. Impedance matching is mainly used on the transmission line to achieve the purpose that all high-frequency microwave signals (i.e., the radio frequency signal in the embodiment of the present application) can be transmitted to the load point, and there will be almost no signal reflected back to the source point, thereby improving the efficiency of energy utilization. In layman's terms, impedance matching can be understood as the signal source internal resistance is equal to the characteristic impedance of the connected transmission line and the same phase, or the characteristic impedance of the transmission line is equal to the connected load impedance and the same phase, respectively referred to as the input end or output end of the transmission line is in an impedance matching state, referred to as impedance matching. In the embodiment of the present application, the first impedance is the front-stage load impedance of the first amplifier 20 (i.e., the connected load impedance). The second impedance is the system transmission impedance of the second power amplifier 200B (i.e., the characteristic impedance of the transmission line used to transmit the RF signal). When the first impedance is equal to the second impedance, the RF signal can be transmitted without reflection on the transmission path. When the first impedance is not equal to the second impedance, the RF signal will generate reflection on the transmission path, generate interference signals, and reduce the transmission efficiency of the RF signal. The embodiment of the present application combines at least one first equivalent capacitor C1 and at least one second equivalent capacitor C2 to achieve impedance matching of the second power amplifier 200B.

[0095] In some examples, when the phase nonlinear characteristic of the first amplifier 20 changes as follows Figure 7As shown in Figure (a), the ratio of the capacitance of at least one first equivalent capacitor to the capacitance of at least one second equivalent capacitor can be 1:15. In an embodiment of the present application, when the ratio of the capacitance of at least one first equivalent capacitor to the capacitance of at least one second equivalent capacitor is 1:15, the distortion compensation of AM-PM is mainly achieved through the first equivalent capacitor C1. The second equivalent capacitor C2 has a lower effect on the phase adjustment and is more of an impedance matching device. Exemplarily, when the capacitance value of the first equivalent capacitor C1 can be 50 femtofarads (fF), the capacitance value of the second equivalent capacitor C2 can be 750 femtofarads (fF). The multiple equivalent capacitors in the capacitor array Z are designed with a capacitance adjustment step of 5% to 15%.

[0096] In some examples, a control signal can be generated based on the baseband processing system 1000, and the control signal can be output to the third predistorter 10C of the second power amplifier 200B. In the embodiment of the present application, the power operating range of the first amplifier 20 is different, and the AM-PM distortion generated by the first amplifier 20 is also different. Therefore, it is necessary to dynamically adjust the number of at least one first equivalent capacitor C1 and / or at least one second equivalent capacitor C2 that are turned on according to the power operating range of the first amplifier 20. The power operating range of the first amplifier 20 is related to the signal power of the first RF signal and the signal power of the second RF signal. The signal power of the first RF signal and the signal power of the second RF signal are related to the data volume of the data information they even receive. When the baseband processing system 1000 generates a baseband signal through data information, it can also generate a control signal according to the size of the data information. The embodiment of the present application only needs to make software-level modifications inside the baseband processing system 1000, and there is no need to add additional hardware related to generating control signals, which can save costs. At the same time, because the baseband processing system 1000 can complete the judgment of the power operating range of the first amplifier 20 before outputting the baseband signal, the generated control signal has a lower delay and a faster response. The mapping relationship between the power operating range of the first amplifier 20 and the at least one first equivalent capacitor C1 and the at least one second equivalent capacitor C2 can be stored in the baseband processing system 1000 in the form of a mapping table.

[0097] In some possible implementations, a mapping relationship between the power operating range of the first amplifier 20 and at least one first equivalent capacitor C1 and at least one second equivalent capacitor C2 may be established. In subsequent work, according to the power operating range currently located by the first amplifier 20, at least one first equivalent capacitor C1 and at least one second equivalent capacitor C2 that need to be turned on are determined through the established mapping relationship, and a corresponding control signal is generated.

[0098] In some examples, a control signal can be generated based on the baseband processing system 1000, and the control signal can be output to the third predistorter 10C of the second power amplifier 200B. The amount of data in the data signal is related to the power operating range of the first amplifier 20. In an embodiment of the present application, the baseband processing system 1000 generates a baseband signal based on the data signal. In this process, the baseband processing system 1000 can also generate a control signal based on the amount of data in the data signal. In the embodiment in which the control signal is generated by the baseband processing system 1000, only the software level of the baseband processing system 1000 needs to be modified, and no additional control components need to be added, thus saving hardware overhead. At the same time, the relevant control signal is generated while the baseband signal is generated. Compared with the method of generating the control signal based on the radio frequency signal, the control delay is lower and the response speed is faster.

[0099] In some examples, such as Fig.12 As shown, the signal power of the second RF signal is obtained by the detection circuit 30, and the first voltage signal is output according to the signal power of the second RF signal. The first voltage signal indicates the signal power of the second RF signal, and the signal power of the second RF signal is related to the current power operating range of the first amplifier 20. The control circuit 40 generates a control signal according to the first voltage signal and outputs the control signal to the third predistorter 10C. In the embodiment of the present application, the nonlinear distortion of the first amplifier 20 is applied to the second RF signal. Feedback control is performed through the second RF signal to generate a control signal. The generated control signal has a high adjustment accuracy for the nonlinear distortion.

[0100] In some examples, such as Fig.13 As shown, the signal power of the first RF signal is obtained by the detection circuit 30, and the first voltage signal is output according to the signal power of the first RF signal. The first voltage signal indicates the signal power of the first RF signal, and the signal power of the first RF signal is related to the current power operating range of the first amplifier 20. The control circuit 40 generates a control signal according to the first voltage signal and outputs the control signal to the third predistorter 10C.

[0101] In some examples, such as Fig.12 and Fig.13 The control circuit 40 shown may be a digital logic control circuit. A digital logic control circuit is established by mapping the power operating range of the first amplifier 20 with at least one first equivalent capacitor C1 and at least one second equivalent capacitor C2. The digital logic control circuit generates a control signal of multiple bits according to the first voltage signal, and each bit of the control signal is used to control a first equivalent capacitor C1 or a first second equivalent capacitor C2 to couple with the input end of the first amplifier 20.

[0102] In some examples, such as Fig.12and Fig.13 The control circuit 40 shown may be a controller. A mapping table is stored in the controller, and the mapping relationship between the power operating range of the first amplifier 20 and at least one first equivalent capacitor C1 and at least one second equivalent capacitor C2 is recorded in the mapping table. The controller determines the first equivalent capacitor C1 and / or the second equivalent capacitor C2 that need to be turned on by a table lookup method according to the input first voltage signal, and generates a corresponding control signal.

[0103] In the embodiments of the present application, Fig.17 As shown, it is a schematic diagram of the phase change of the second RF signal before and after AM-PM distortion compensation is performed by the third predistorter 10C. In the figure, line ① is a schematic diagram of the phase change of the second RF signal output by the first amplifier 20 with the input power before AM-PM distortion compensation is performed by the third predistorter 10C. Line ② is a schematic diagram of the phase change of the second RF signal output by the first amplifier 20 with the input power after AM-PM distortion compensation is performed by the third predistorter 10C. Taking the saturation power operating point of the first amplifier 20 as 0dB as an example, it can be seen that, as shown in line ①, before AM-PM distortion compensation is performed by the third predistorter 10C, when the power operating range of the first amplifier 20 is at the back-off power point of -5dB, the phase of the second RF signal begins to decrease, that is, AM-PM distortion begins to exist. As shown in line ②, after AM-PM distortion compensation is performed by the third predistorter 10C, AM-PM distortion begins to appear on the second RF signal after the saturation power operating point of the first amplifier 20 is reached. Therefore, after adopting the capacitor array Z formed by multiple equivalent capacitors recorded in the embodiment of the present application, the first amplifier 20 can be compensated for AM-PM distortion in the range of -5dB to 0dB. At the same time, when the third predistorter 10C is not adopted, the power amplifier 200 is simulated, and its error vector magnitude (EVM) is -44dB. After adopting the third predistorter 10C recorded in the embodiment of the present application, the power amplifier 200 is simulated, and its EVM is -57dB. Therefore, by adopting the third predistorter 10C recorded in the embodiment of the present application, the EVM with an amplitude of 13dB can be reduced, which greatly improves the linearity of the power amplifier 200 and the quality of the output second RF signal.

[0104] The embodiment of the present application provides a power amplifier, a control method, a signal transmission system and an electronic device, wherein a predistorter and a first amplifier are provided in the power amplifier. Among them, the third predistorter 10C includes a plurality of equivalent capacitors. The plurality of equivalent capacitors are coupled to the input end of the first amplifier. At least one equivalent capacitor among the plurality of equivalent capacitors is controlled to be turned on with the input end of the first amplifier by a control signal. When the equivalent capacitor is turned on with the input end of the first amplifier, the phase of the second RF signal changes. In the embodiment of the present application, different degrees of AM-PM distortion will be generated on the first amplifier according to the different power operating intervals in which the first amplifier is located. The control signal is used to select and turn on at least one equivalent capacitor of different numbers to change the phase of the first RF signal input by the first amplifier, thereby changing the phase of the second RF signal output by the first amplifier to compensate for the AM-PM distortion generated by the first amplifier. At the same time, the equivalent capacitor may include a plurality of first equivalent capacitors and / or a plurality of second equivalent capacitors. Among them, the plurality of equivalent capacitors can achieve the following beneficial effects: first, a plurality of first equivalent capacitors are coupled in parallel with the input end of the first amplifier. A plurality of second equivalent capacitors are coupled in series with the input end of the first amplifier. When the phase nonlinearity of the first amplifier is manifested as a decrease in phase as the input power increases, a control signal can be used to control at least one first equivalent capacitor to be connected in parallel with the input end of the first amplifier to increase the phase of the first RF signal, thereby compensating for the AM-PM distortion of the first amplifier. A control signal can also be used to control at least one second equivalent capacitor to be connected in series with the input end of the first amplifier to fine-tune and reduce the phase of the first RF signal, thereby fine-tuning the accuracy of compensating for the AM-PM distortion of the first amplifier. Second, when the phase nonlinearity of the first amplifier is manifested as an increase in phase as the input power increases, a control signal can be used to control at least one second equivalent capacitor to be connected in series with the input end of the first amplifier to reduce the phase of the first RF signal, thereby compensating for the AM-PM distortion of the first amplifier. A control signal can also be used to control at least one first equivalent capacitor to be connected in parallel with the input end of the first amplifier to fine-tune and reduce the phase of the first RF signal, thereby fine-tuning the accuracy of compensating for the AM-PM distortion of the first amplifier. Third, the combination of at least one first equivalent capacitor and at least one second equivalent capacitor can adjust the impedance of the power amplifier to achieve impedance matching. Fourth, after impedance matching is achieved by combining at least one first equivalent capacitor and at least one second equivalent capacitor, the second amplifier can be coupled to the front stage of the first amplifier to perform impedance matching between the first amplifier and the second amplifier using at least one first equivalent capacitor and at least one second equivalent capacitor. Fifth, the second amplifier can be set as a digital predistorter. Analog predistortion is achieved through at least one first equivalent capacitor and / or at least one second equivalent capacitor.The power amplifier is a hybrid predistortion amplifier combining digital predistortion and analog predistortion, so as to improve the compensation effect on the nonlinear characteristics (including phase nonlinear characteristics and amplitude nonlinear characteristics) of the first amplifier.

[0105] The present application also provides a computer-readable storage medium, which includes instructions. When the instructions are executed on a processor, the processor executes the above embodiment (for example, Fig.15 ) The control method described in the

[0106] The processor involved in the embodiments of the present application may be a chip. For example, it may be a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on chip (SoC), a central processor unit (CPU), a network processor (NP), a digital signal processor (DSP), a microcontroller unit (MCU), a programmable logic device (PLD), or other integrated chips.

[0107] The memory involved in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), and direct RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0108] It should be understood that in the various embodiments of the present application, 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.

[0109] Those of ordinary skill in the art will appreciate that the modules and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0110] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and modules described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0111] 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 modules is only a logical function division. There may be other division methods in actual implementation, such as multiple modules or components can be combined or integrated into another device, 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 modules, which can be electrical, mechanical or other forms.

[0112] The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical modules, that is, they may be located in one device or distributed on multiple devices. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment.

[0113] In addition, each functional module in each embodiment of the present application may be integrated into one device, or each module may exist physically separately, or two or more modules may be integrated into one device.

[0114] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using a software program, 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 loading and executing a computer program instruction 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 devices. 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 a website site, a computer, a server or a data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (Digital Subscriber Line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium may be any available medium that a computer can access or may contain one or more servers, data centers and other data storage devices that can be integrated with a medium. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (eg, a solid state disk (SSD)).

[0115] 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 power amplifier, characterized in that: The invention comprises a predistorter and a first amplifier; the predistorter comprises a plurality of equivalent capacitors; wherein: The first amplifier is used to: input a first radio frequency signal and output a second radio frequency signal; The predistorter is used to input a control signal; the control signal is used to control at least one equivalent capacitor among the multiple equivalent capacitors to be connected to the input end of the first amplifier; When the equivalent capacitor is connected to the input end of the first amplifier, the phase of the second radio frequency signal changes.

2. The power amplifier according to claim 1, characterized in that: The multiple equivalent capacitors include multiple first equivalent capacitors; the control signal includes a first control signal; wherein: The first control signal is used to: control at least one first equivalent capacitor among the plurality of first equivalent capacitors to be connected in parallel with the input end of the first amplifier; When the at least one first equivalent capacitor is connected in parallel with the input end of the first amplifier and is turned on, the phase of the second radio frequency signal increases.

3. The power amplifier according to claim 1, characterized in that: The multiple equivalent capacitors include multiple second equivalent capacitors; the control signal includes a second control signal; wherein: The second control signal is used to: control at least one second equivalent capacitor among the plurality of second equivalent capacitors to be connected in series with the input end of the first amplifier; When the at least one second equivalent capacitor is connected in series with the input terminal of the first amplifier and is turned on, the phase of the second radio frequency signal decreases.

4. The power amplifier according to claim 2, characterized in that: The multiple equivalent capacitors also include multiple second equivalent capacitors; the control signal also includes a second control signal; wherein: The second control signal is used to: control at least one second equivalent capacitor among the plurality of second equivalent capacitors to be connected in series with the input end of the first amplifier; The at least one first equivalent capacitor and the at least one second equivalent capacitor are further used for: The magnitude of the first impedance is adjusted to be equal to the magnitude of the second impedance, and the phase of the first impedance is adjusted to be equal to the phase of the second impedance; the first impedance is the front-stage load impedance of the first amplifier; and the second impedance is the system transmission impedance of the power amplifier.

5. The power amplifier according to claim 4, characterized in that: When the multiple equivalent capacitors include the multiple first equivalent capacitors and the multiple second equivalent capacitors, the capacitance of the at least one first equivalent capacitor is not greater than the capacitance of the at least one second equivalent capacitor, or the capacitance of the at least one first equivalent capacitor is not less than the capacitance of the at least one second equivalent capacitor.

6. The power amplifier according to claim 5, characterized in that: The ratio of the capacitance of the at least one first equivalent capacitor to the capacitance of the at least one second equivalent capacitor is 1:

15.

7. The power amplifier according to any one of claims 1 to 6, characterized in that: The power amplifier further comprises a detection circuit and a control circuit; the input end of the detection circuit is coupled to the input end of the first amplifier or the output end of the first amplifier; the output end of the detection circuit is coupled to the input end of the control circuit; the output end of the control circuit is coupled to the controlled end of the predistorter; wherein: When the input end of the detection circuit is coupled to the output end of the first amplifier, the detection circuit is used to: output a first voltage signal to the control circuit according to the second radio frequency signal; the voltage value of the first voltage signal is used to indicate the signal power of the second radio frequency signal; When the input end of the detection circuit is coupled to the input end of the first amplifier, the detection circuit is used to: output a first voltage signal to the control circuit according to the first radio frequency signal; the voltage value of the first voltage signal is used to indicate the signal power of the first radio frequency signal; The control circuit is used for outputting the control signal to the predistorter according to the first voltage signal.

8. The power amplifier according to any one of claims 1 to 7, characterized in that: The predistorter further comprises a second amplifier; an output terminal of the second amplifier is coupled to an input terminal of the first amplifier; wherein: The second amplifier is used to: input an initial RF signal and output the first RF signal; the signal power of the first RF signal is in a nonlinear coefficient amplification relationship with the signal power of the initial RF signal; the signal power of the second RF signal is in a linear coefficient amplification relationship with the signal power of the initial RF signal.

9. A control method, characterized in that: Applied to a power amplifier, the power amplifier includes a predistorter and a first amplifier; the predistorter includes a plurality of equivalent capacitors; the method includes: The first amplifier inputs a first radio frequency signal and outputs a second radio frequency signal; Sending a control signal to the predistorter; the control signal is used to: control at least one equivalent capacitor among the multiple equivalent capacitors to be connected to the input end of the first amplifier; When the equivalent capacitor is connected to the input end of the first amplifier, the phase of the second radio frequency signal changes.

10. The control method according to claim 9, characterized in that: The multiple equivalent capacitors include multiple first equivalent capacitors; the control signal includes a first control signal; the first control signal is used to: control at least one first equivalent capacitor among the multiple first equivalent capacitors to be connected in parallel with the input end of the first amplifier; When the at least one first equivalent capacitor is connected in parallel with the input end of the first amplifier and is turned on, the phase of the second radio frequency signal increases.

11. The control method according to claim 9, characterized in that: The multiple equivalent capacitors include multiple second equivalent capacitors; the control signal includes a second control signal; the second control signal is used to: control at least one second equivalent capacitor among the multiple second equivalent capacitors to be connected in series with the input end of the first amplifier; When the at least one second equivalent capacitor is connected in series with the input terminal of the first amplifier and is turned on, the phase of the second radio frequency signal decreases.

12. The control method according to claim 10, characterized in that: The multiple equivalent capacitors include multiple second equivalent capacitors; the control signal includes a second control signal; and the method further includes: Based on the first control signal, control at least one second equivalent capacitor among the plurality of second equivalent capacitors to be connected in series with the input terminal of the first amplifier; Based on the first control signal and the second control signal, the magnitude of the first impedance is controlled to be equal to the magnitude of the second impedance, and the phase of the first impedance is controlled to be equal to the phase of the second impedance; the first impedance is the front-stage load impedance of the first amplifier; and the second impedance is the system transmission impedance of the power amplifier.

13. The control method according to claim 11 or 12, characterized in that: The capacitance of the at least one first equivalent capacitor is not greater than the capacitance of the at least one second equivalent capacitor, or the capacitance of the at least one first equivalent capacitor is not less than the capacitance of the at least one second equivalent capacitor.

14. The control method according to claim 13, characterized in that: The ratio of the capacitance of the at least one first equivalent capacitor to the capacitance of the at least one second equivalent capacitor is 1:

15.

15. The control method according to any one of claims 9 to 14, characterized in that: Outputting a control signal to the predistorter comprises: According to the first radio frequency signal, a first voltage signal is obtained; the voltage value of the first voltage signal is used to indicate the signal power of the first radio frequency signal; or, according to the second radio frequency signal, a first voltage signal is obtained; the voltage value of the first voltage signal is used to indicate the signal power of the second radio frequency signal; The control signal is output to the predistorter according to the first voltage signal.

16. A signal transmission system, characterized in that: The signal transmission system includes a radio frequency generating circuit and a power amplifier as described in any one of claims 1 to 8; the output end of the radio frequency generating circuit is coupled to the input end of the power amplifier; the radio frequency generating circuit is used to output an initial radio frequency signal to the power amplifier; the power amplifier is used to: output a second radio frequency signal according to the initial radio frequency signal; the signal power of the second radio frequency signal is in a gain amplification relationship with the signal power of the initial radio frequency signal.

17. An electronic device, characterized in that: It comprises a baseband processing system and the signal transmitting system as claimed in claim 16; the output end of the baseband processing system is coupled to the input end of the signal transmitting system.

18. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes instructions; when the instructions are executed on a processor, the processor is caused to execute the control method according to any one of claims 9 to 15.

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