Radio frequency power amplifier and working method thereof

Abstract

The present invention provides a radio frequency power amplifier and a working method thereof, wherein the radio frequency power amplifier comprises a digital control module for outputting a digital signal to a digital-to-analog conversion module, wherein the digital-to-analog conversion module converts the digital signal into a DC bias voltage output to the power amplifier module; the power amplifier module is provided with a plurality of parallel power control branches, each of which has a power amplifier tube and a switch tube, and the power amplifier tube receives the DC bias voltage output by the digital-to-analog conversion module; the digital control module also outputs a logic control signal to the logic control module, and the logic control module generates a radio frequency signal according to the logic control signal, and the radio frequency signal is used to control the on-off state of the switch tube, and the power amplification factor of at least one power amplifier tube is different from the power amplification factor of another power amplifier tube. The present invention also provides a working method of the radio frequency power amplifier. The present invention has low production cost and improves the efficiency of the power amplifier.

Description

Technical Field

[0001] The present invention relates to the technical field of power amplifiers, and in particular to a radio frequency power amplifier and a working method of the radio frequency power amplifier. Background Art

[0002] Electronic devices use a large number of amplifiers, among which Class E power amplifiers are a common type of power amplifier. Class E power amplifiers have the advantage of high efficiency and are gradually used in wireless communication scenarios. However, in wireless communication scenarios, the output power of the power amplifier often needs to be adjusted, and it is difficult for existing Class E power amplifiers to ensure high efficiency under different output power states, which restricts the application of Class E power amplifiers in low-power application scenarios such as automotive electronics.

[0003] To this end, there is an existing RF power amplifier with an amplitude modulation function. This RF power amplifier includes an input matching module, a first-stage amplification module, an inter-stage matching module, a second-stage amplification module, and an output matching module connected in sequence, wherein the input matching module is used to match the input signal to the first-stage amplification module, the inter-stage matching module is used to match the output of the first-stage amplification module to the input of the second-stage amplification module, and the output matching module is used to match the impedance of the antenna to the output impedance required by the second-stage amplification module; the second-stage amplification module is used to provide variable gain, and the second-stage amplification module includes a second inductor and at least two controllable power branches, and each controllable power branch is connected in parallel with each other and then in series with the inductor.

[0004] However, this power amplifier is provided with two-stage amplification modules, and an inter-stage matching module is also provided between the two-stage amplification modules, which has a complex structure, resulting in a large number of electronic components used in the power amplifier and high production costs. In addition, since this power amplifier cannot adjust the efficiency according to different output power states, the efficiency of the power amplifier cannot be improved. Summary of the invention

[0005] The first object of the present invention is to provide a radio frequency power amplifier which has a simple structure and can effectively improve efficiency.

[0006] The second object of the present invention is to provide a working method of the above-mentioned radio frequency power amplifier.

[0007] To achieve the first purpose of the present invention, the RF power amplifier provided by the present invention includes a digital control module, which is used to output a digital signal to a digital-to-analog conversion module, and the digital-to-analog conversion module converts the digital signal into a DC bias voltage output to the power amplifier module; the power amplifier module is provided with more than two parallel power control branches, each power control branch has a power amplifier tube and a switch tube, and the power amplifier tube receives the DC bias voltage output by the digital-to-analog conversion module; the digital control module also outputs a logic control signal to the logic control module, and the logic control module generates a radio frequency signal for sending to multiple switch tubes according to the logic control signal, and the radio frequency signal is used to control the on and off state of the switch tube, and the power amplification factor of at least one power amplifier tube is different from the power amplification factor of another power amplifier tube.

[0008] It can be seen from the above scheme that the digital control module outputs a digital signal to the digital-to-analog conversion module according to the need for power adjustment, and the digital-to-analog conversion module converts the digital signal into a corresponding DC bias voltage. The current size of each power control branch is changed by changing the size of the DC bias voltage of each power amplifier tube. For example, after the current of the power control branch is reduced, the power loss of the parasitic resistance of the power control branch is also reduced accordingly, thereby improving the efficiency of the power control branch.

[0009] On the other hand, the working state of each switching tube can be controlled by the RF signal, so that the RF power amplifier can operate in high power mode, medium power mode or low power mode. Therefore, the digital control module can obtain different powers by outputting different logic control signals, thereby achieving the purpose of power adjustment.

[0010] Since the efficiency of the power amplifier is adjusted by means of digital signals, the adjustment is more precise. Therefore, the digital signal to be output can be flexibly determined according to different efficiency requirement scenarios, thereby effectively improving the efficiency of the power amplifier in different output power requirement scenarios.

[0011] In addition, since the radio frequency power amplifier does not need to be provided with a two-stage amplification module, nor does it need to be provided with an inter-stage matching module, the structure is simple and the production cost is low.

[0012] A preferred solution is that the power amplifier tube and the switch tube of each power control branch are arranged with a common source and a common gate.

[0013] It can be seen that the common source and common gate setting of the switching tube and the power amplifier tube can effectively reduce the breakdown risk of the switching tube, avoid damage to the switching tube, and thus extend the service life of the RF power amplifier.

[0014] A further solution is that the control electrode of the power amplifier tube of each power control branch receives the DC bias voltage output by the digital-to-analog conversion module, and the DC bias voltage received by the control electrode of each power amplifier tube is equal.

[0015] In this way, the power amplifier tubes of multiple power control branches can be controlled synchronously, making the efficiency control of the radio frequency power amplifier more precise.

[0016] A further solution is that the control electrode of the switch tube of each power control branch receives the radio frequency signal generated by the logic control signal, and each switch tube independently receives its own radio frequency signal.

[0017] It can be seen that the digital control module can independently control the switch tubes of each power control branch without affecting the operation of the switch tubes of other power control branches, so that flexible control of the output power can be achieved.

[0018] A preferred solution is that more than two logic control branches are provided in the logic control module, each logic control branch receives a logic control signal and a radio frequency signal, and generates a radio frequency signal corresponding to the logic control branch based on the logic control signal and the radio frequency signal.

[0019] It can be seen that for each switch tube, a corresponding logic control branch is set to generate a corresponding logic control signal, thereby ensuring that the RF signals for different switch tubes are generated independently, thereby achieving independent control of each switch tube.

[0020] A further solution is that the RF power amplifier also includes a low-voltage dropout linear regulator, which receives the signal output by the digital-to-analog conversion module and generates a power supply voltage that can be digitally controlled by bits and provides it to the matching circuit.

[0021] To achieve the above-mentioned second purpose, the working method of the RF power amplifier provided by the present invention includes: the digital control module outputs a digital signal to the digital-to-analog conversion module, the digital-to-analog conversion module converts the digital signal into a matching DC bias voltage, and outputs the DC bias voltage to the power amplifier tube of each power control branch; the digital control module outputs a logic control signal to the logic control module, the logic control module generates RF signals corresponding to multiple switching tubes according to the logic control signal, and outputs the RF signal to the corresponding switching tubes.

[0022] As can be seen from the above scheme, the digital signal obtained by the digital control module output is used to accurately control the DC bias voltage of each power amplifier tube, thereby controlling the current of each power control branch, thereby achieving accurate control of the efficiency of the RF power amplifier and improving the accuracy of the control. In addition, since the RF power amplifier does not need to set up a two-stage amplification circuit, the structure is simple and the production cost is low.

[0023] A preferred solution is that the digital control module controls the conduction state of each switch tube by outputting a logic control signal to the logic control module.

[0024] It can be seen that the RF signal of each switch tube is generated independently, that is, each switch tube can be controlled independently, so as to facilitate the adjustment of the output power of the RF power amplifier.

[0025] A further solution is that the digital control module outputs a digital signal to the digital-to-analog conversion module according to the change in power usage demand, thereby changing the DC bias voltage.

[0026] In this way, the efficiency of the RF power amplifier can be adjusted in the form of digital signals. Since the adjustment accuracy of digital signals is much higher than that of analog signals, the adjustment accuracy of the RF power amplifier can be improved.

[0027] A further solution is that the digital-to-analog conversion module adjusts the DC bias voltages of the power amplifier tubes of multiple power control branches simultaneously.

[0028] It can be seen that by synchronously controlling the DC bias voltages of the power amplifier tubes of multiple power control branches, the efficiency control of the RF power amplifier is made more precise. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural block diagram of an embodiment of a radio frequency power amplifier of the present invention.

[0030] Figure 2 It is an electrical schematic diagram of an embodiment of a radio frequency power amplifier of the present invention.

[0031] Figure 3 It is an electrical schematic diagram of a logic control module in an embodiment of a radio frequency power amplifier of the present invention.

[0032] The present invention is further described below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0033] The RF power amplifier of the present invention adopts multiple parallel power control branches, which can meet the adjustment of output power under different power requirements. Therefore, the DC bias voltage of each power amplifier tube can be dynamically adjusted according to different output power requirements, or the working state of each switch tube can be controlled. On the one hand, the accuracy of efficiency control can be improved through the control method of digital signals. On the other hand, through the compact circuit structure, the number of electronic components used in the RF power amplifier can be reduced, thereby reducing the production cost of the RF power amplifier.

[0034] See also Figure 1The RF power amplifier of this embodiment has a digital control module 10, a digital-to-analog conversion module 11, a logic control module 13, a power amplifier module 14, a low voltage drop linear voltage regulator module 15 and a matching circuit 16, wherein the power amplifier module 14 is provided with a plurality of parallel power control branches. The logic control module 13 receives an input RF signal, and the matching circuit 16 outputs an output RF signal.

[0035] The digital control module 10 can set a suitable digital signal according to the actual output power requirement, and send the digital signal to the digital-to-analog conversion module 11, which converts the digital signal into an analog signal, and sends the analog signal as a DC bias voltage to the power amplifier module 14. The power amplifier tube in the power amplifier module 14 operates under the DC bias voltage.

[0036] In addition, the digital control module 10 also outputs a logic control signal to the logic control module 13. The logic control module 13 generates multiple groups of RF signals according to the received input RF signal and the logic control signal, and sends the RF signal to the power amplifier module 14, thereby controlling the working state of the switch tube of the power amplifier module 14, and then adjusting the power of the output RF signal. In addition, the digital-to-analog conversion module 11 also outputs a signal to the low-voltage dropout linear regulator 15. After receiving the signal output by the digital-to-analog conversion module 11, the low-voltage dropout linear regulator 15 generates a power supply voltage that can be digitally controlled by the bit and provides it to the matching circuit 16. Finally, the matching circuit 16 forms an output RF signal.

[0037] See also Figure 2 The digital control module 10 is implemented by a known digital control module and is used to generate a digital control bit corresponding to the target power value. The digital control bit is a multi-bit binary number, and the digital control module 10 outputs different digital control bits to control the level of the logic control signal output by the logic control module 13. Therefore, the digital control module 10 can generate a corresponding digital control bit according to the size of the target power that the RF power amplifier needs to output, thereby adjusting the output power of the RF power amplifier.

[0038] The digital control module 10 also outputs a digital signal to the digital-to-analog conversion module 11 . The digital-to-analog conversion module 11 converts the received digital signal into an analog signal, and the converted analog signal is output to the power amplifier module 14 as a DC bias voltage.

[0039] The power amplifier module 14 has three parallel power control branches, each of which has a power amplifier tube and a switch tube. Figure 2The dotted box is the power amplifier module 14. For example, the leftmost power control branch includes a power amplifier tube MN1 and a switch tube MN4, wherein the power amplifier tube MN1 and the switch tube MN4 are both field effect tubes, and the power amplifier tube MN1 and the switch tube MN4 are arranged in a common source and common gate manner. This arrangement can effectively reduce the risk of the switch tube MN4 being broken down, thereby extending the service life of the RF power amplifier.

[0040] Similarly, the power control branch located in the middle includes a power amplifier tube MN2 and a switch tube MN5, both of which are field effect tubes, and the power amplifier tube MN2 and the switch tube MN5 are arranged in a common source and common gate manner. In addition, the power control branch located on the right side includes a power amplifier tube MN3 and a switch tube MN6, both of which are field effect tubes, and the power amplifier tube MN3 and the switch tube MN6 are also arranged in a common source and common gate manner.

[0041] In this embodiment, the power amplifier tubes MN1, MN2, and MN3 of each power control branch receive the DC bias voltage output by the digital-to-analog conversion module 11. Specifically, the control electrode, that is, the gate of the power amplifier tube MN1 receives the DC bias voltage DAC1, the gate of the power amplifier tube MN2 receives the DC bias voltage DAC2, and the gate of the power amplifier tube MN3 receives the DC bias voltage DAC3. Preferably, the DC bias voltages DAC1, DAC2, and DAC3 received by the gates of the three power amplifier tubes MN1, MN2, and MN3 are all the same. In other words, the digital-to-analog conversion module 11 simultaneously outputs the same voltage signal to the gates of the three power amplifier tubes MN1, MN2, and MN3.

[0042] The logic control module 13 receives the input RF signal on the one hand, and receives the logic control signal output by the digital control module 10 on the other hand. Preferably, the number of logic control signals output by the digital control module 10 is equal to the number of switch tubes in the power amplifier module 14, that is, equal to the number of power control branches in the power amplifier module 14. In this embodiment, since the power amplifier module 14 is provided with three switch tubes MN4, MN5, and MN6, the digital control module 10 outputs three logic control signals to the logic control module 13, including logic control signal 1, logic control signal 2, and logic control signal 3.

[0043] The logic control module 13 generates a radio frequency signal according to the received input radio frequency signal and the logic control signal, see Figure 3, three logic control branches are arranged in the logic control module 13, that is, the number of logic control branches is equal to the number of power control branches. Each logic control branch receives a logic control signal and a radio frequency signal, and generates a radio frequency signal corresponding to the logic control branch based on the received logic control signal and radio frequency signal.

[0044] from Figure 3 It can be seen that the first logic control branch includes a NOT gate N1 and a NOR gate NOR1. The NOT gate N1 receives the logic control signal 1 and inverts the logic control signal 1. The NOR gate NOR1 receives the NOT gate N1 and the input RF signal, performs NOR calculation on the NOT gate N1 and the input RF signal, and the output result of the NOR gate NOR1 forms the RF signal 1 after passing through the delay device T1.

[0045] In this way, when the input RF signal is high, if the logic control signal 1 is also high, the NOT gate N1 will output a low signal, or the NOT gate NOR1 will output a low signal, and after a delay, the RF signal 1 is also a low signal. If the logic control signal 1 is low, the NOT gate N1 will output a high signal, or the NOT gate NOR1 will output a low signal, and after a delay, the RF signal 1 is also a low signal.

[0046] When the input RF signal is at a low level, if the logic control signal 1 is a high level signal, the NOT gate N1 will output a low level signal, or the NOT gate NOR1 will output a high level signal, and after a delay, the RF signal 1 is also a high level signal. If the logic control signal 1 is a high level signal, the NOT gate N1 will output a low level signal, or the NOT gate NOR1 will output a low level signal, and after a delay, the RF signal 1 is also a low level signal.

[0047] It can be seen that when the input RF signal is a high-level signal, no matter whether the logic control signal 1 is a high-level or a low-level signal, the RF signal 1 is a low-level signal. Only when the input RF signal is a low-level signal, the level of the formed RF signal 1 is the same as the level of the logic control signal 1. In this way, when the input RF signal is a low-level signal, the level of the RF signal 1 can be changed by controlling the level of the logic control signal 1. Since the RF signal 1 will be output to the control electrode of the switch tube MN4, that is, the gate, the on-off state of the switch tube MN4 can be controlled by controlling the level of the logic control signal 1.

[0048] Correspondingly, the second logic control branch includes a NOT gate N2 and a NOR gate NOR2, the NOT gate N2 receives the logic control signal 2 and inverts the logic control signal 2, the NOR gate NOR2 receives the NOT gate N2 and the input RF signal, performs NOR calculation on the NOT gate N2 and the input RF signal, and the output result of the NOR gate NOR2 passes through the delay device T2 to form the RF signal 2. The third logic control branch includes a NOT gate N3 and a NOR gate NOR3, the NOT gate N3 receives the logic control signal 3 and inverts the logic control signal 3, the NOR gate NOR3 receives the NOT gate N3 and the input RF signal, performs NOR calculation on the NOT gate N3 and the input RF signal, and the output result of the NOR gate NOR3 passes through the delay device T3 to form the RF signal 3. The logic calculation principle of the second logic control branch and the third logic control branch is the same as that of the first logic control branch, and will not be repeated.

[0049] In this embodiment, the three switch tubes MN4, MN5, and MN6 can be set to different sizes according to the output power requirements. Therefore, the amplification capabilities of the RF signal are also different. For example, the power amplification factor of the RF signal by the switch tube MN4 is the smallest, the power amplification factor of the RF signal by the switch tube MN4 is greater than the power amplification factor of the RF signal by the switch tube MN5, and the power amplification factor of the RF signal by the switch tube MN6 is the largest. In this way, different switch tubes can be selected to amplify the RF signal according to different output power requirements, thereby meeting different output power requirements. For example, if the RF amplifier needs to work in low power mode, only the switch tube MN4 is turned on. If the RF amplifier needs to work in medium power mode, only the switch tube MN5 is turned on. If the RF amplifier needs to work in high power mode, only the switch tube MN6 is turned on.

[0050] It can be seen that the logic control module 13 can control the on / off state of each logic control branch, and the digital-to-analog conversion module 11 can control the gate voltage of each power switch tube, thereby adjusting the output power of the RF power amplifier.

[0051] The low voltage dropout linear regulator 15 receives the signal output by the digital-to-analog conversion module 11, and generates a power supply voltage that can be controlled by a digital control bit according to the received signal and provides it to the matching circuit 16. In this embodiment, the low voltage dropout linear regulator 15 is implemented by a known low voltage dropout linear regulator. Figure 2 The matching circuit 16 includes inductors L1, L2 and capacitors C2, C3, and C4, wherein the inductor L1 is connected in series with the capacitor C1, the inductor L2 is connected to one end of the inductor L1, the inductor L2, the capacitors C2, and C4 are connected in series in sequence, one end of the capacitor C3 is connected between the capacitors C2 and C3, and the other end is grounded. The matching circuit 16 is used to adjust the power of the RF signal output by the power amplifier module 14.

[0052] The working principle of the RF power amplifier is introduced below. First, the digital control module 10 determines whether the RF power amplifier needs to work in high power mode, medium power mode or low power mode according to the output target power, and thereby determines which switch tube needs to be in the on state, and then determines the high and low level states of the logic control signal 1, the logic control signal 2, and the logic control signal 3 output to the logic control module 13.

[0053] In addition, the digital control module 10 also determines the requirements for precision control under different output powers based on the output power of the RF power amplifier, thereby determining the size of the DC bias voltage loaded to each power amplifier tube, and then calculating the bit value of the digital signal output to the digital-to-analog conversion module 11.

[0054] Then, the digital control module 10 outputs three logic control signals to the logic control module 13. The logic control module 13 calculates three RF signals according to the received input RF signal and the logic control signal, and outputs the three RF signals to the gates of the three switch tubes MN4, MN5, and MN6, thereby controlling the on and off conditions of the three switch tubes MN4, MN5, and MN6. For example, if the RF signal 1 is at a high level, and the RF signal 2 and the RF signal 3 are at a low level, then only the switch tube MN4 is in the on state, and the switch tubes MN5 and MN6 are in the off state, and this is the low power mode; if the RF signal 2 is at a high level, and the RF signal 1 and the RF signal 3 are at a low level, then only the switch tube MN5 is in the on state, and the switch tubes MN4 and MN6 are in the off state, and this is the medium power mode; if the RF signal 3 is at a high level, and the RF signal 1 and the RF signal 2 are at a low level, then only the switch tube MN6 is in the on state, and the switch tubes MN4 and MN5 are in the off state, and this is the high power mode.

[0055] At the same time, the digital control module 10 outputs a digital signal to the digital-to-analog conversion module 11, and the digital-to-analog conversion module 11 converts the received digital signal into an analog signal, and forms a DC bias voltage DAC1, DAC2, and DAC3 loaded on each power amplifier tube MN1, MN2, and MN3. Specifically, in an application scenario with a large output power, by changing the DC bias voltage of each power amplifier tube, the current of each power control branch is reduced, thereby reducing the power loss of the parasitic resistance and improving the efficiency, thereby effectively improving the efficiency of the power amplifier in different output power demand scenarios.

[0056] It can be seen that the digital-to-analog conversion module 11 of the present invention converts the digital control bit output by the digital control module 10 into a corresponding reference voltage, which is used to drive the gate terminals of the three power amplifier tubes MN1, MN2, and MN3. Due to the non-ideal characteristics of the square wave signal in the actual application scenario, that is, the square wave signal has a certain rise time and fall time, by controlling the DC bias voltage of the square wave signal, the on-time of the three power amplifier tubes MN1, MN2, and MN3 can be controlled, which is equivalent to the control of the duty cycle of the input signal, thereby realizing the control of the output power.

[0057] In addition, the logic control module 13 uses three logic control units 1, 2, and 3 to perform logic control on the RF signal, thereby performing switch control on the three switch tubes MN4, MN5, and MN6. Since the three power control branches are in parallel, and the power amplification factors of the three switch tubes MN4, MN5, and MN6 are different, in application scenarios with low output power, unnecessary power control branches can be turned off to improve efficiency. In application scenarios with high output power, the current of each power control branch is reduced by changing the DC bias voltage of the power amplifier tube, thereby reducing the power loss of the parasitic resistance, thereby improving efficiency, and effectively improving the efficiency of the RF power amplifier in different output power demand scenarios.

[0058] Finally, it should be emphasized that the present invention is not limited to the above-mentioned embodiments. For example, changes in the number of power control branches set in the power amplifier module, or changes in the component types of the switching tube and the power amplifier tube, etc., should also be included in the scope of protection of the claims of the present invention.

Claims

1. A radio frequency power amplifier, characterized in that: include: A digital control module, used to output a digital signal to the digital-to-analog conversion module, and the digital-to-analog conversion module converts the digital signal into a DC bias voltage output to the power amplifier module; The power amplifier module is provided with more than two parallel power control branches, each of which has a power amplifier tube and a switch tube, and the power amplifier tube receives the DC bias voltage output by the digital-to-analog conversion module; The digital control module further outputs a logic control signal to the logic control module, and the logic control module generates a radio frequency signal for sending to the plurality of switch tubes according to the logic control signal, wherein the radio frequency signal is used to control the on and off states of the switch tubes, and the power amplification factor of at least one of the power amplifier tubes is different from the power amplification factor of another power amplifier tube; The digital control module is used to determine the requirements for precision control under different output powers according to the requirements for the output power of the RF power amplifier, thereby determining the magnitude of the DC bias voltage loaded on each of the power amplifier tubes, and then calculating the bit value of the digital signal output to the digital-to-analog conversion module. The digital control module generates a corresponding digital control bit according to the magnitude of the target power that the RF power amplifier needs to output to adjust the output power of the RF power amplifier; In application scenarios with relatively high output power, by changing the DC bias voltage of each power amplifier tube, the current of each power control branch is reduced to reduce the power loss of the parasitic resistance, thereby improving the efficiency of the power amplifier in scenarios with different output power requirements; The logic control module is provided with more than two logic control branches, and the logic control module controls the on-off state of each logic control branch, and the digital-to-analog conversion module controls the gate voltage of each switch tube, thereby adjusting the output power of the RF power amplifier.

2. The radio frequency power amplifier according to claim 1, characterized in that: The power amplifier tube and the switch tube of each power control branch are arranged in a common source and common gate configuration.

3. The radio frequency power amplifier according to claim 1 or 2, characterized in that: The control electrode of the power amplifier tube of each power control branch receives the DC bias voltage output by the digital-to-analog conversion module, and the DC bias voltage received by the control electrode of each power amplifier tube is equal.

4. The radio frequency power amplifier according to claim 1 or 2, characterized in that: The control electrode of the switch tube of each power control branch receives the radio frequency signal generated by the logic control signal, and each switch tube independently receives its own radio frequency signal.

5. The radio frequency power amplifier according to claim 1 or 2, characterized in that: Each of the logic control branches receives the logic control signal and the radio frequency signal, and generates a radio frequency signal corresponding to the logic control branch based on the logic control signal and the radio frequency signal.

6. The radio frequency power amplifier according to claim 5, characterized in that: The radio frequency power amplifier also includes a low voltage dropout linear regulator, which receives the signal output by the digital-to-analog conversion module and generates a power supply voltage that can be digitally controlled by bits and provides it to the matching circuit.

7. A method for operating a radio frequency power amplifier according to any one of claims 1 to 6, characterized in that: include: The digital control module outputs a digital signal to the digital-to-analog conversion module, and the digital-to-analog conversion module converts the digital signal into a matching DC bias voltage, and outputs the DC bias voltage to the power amplifier tube of each power control branch; The digital control module outputs a logic control signal to the logic control module, and the logic control module generates radio frequency signals corresponding to the plurality of switch tubes according to the logic control signal, and outputs the radio frequency signals to the corresponding switch tubes.

8. The operating method of the radio frequency power amplifier according to claim 7, characterized in that: The digital control module controls the conduction state of each of the switch tubes by outputting a logic control signal to the logic control module.

9. The working method of the radio frequency power amplifier according to claim 7 or 8, characterized in that: The digital control module outputs a digital signal to the digital-to-analog conversion module according to the change in power usage demand, thereby changing the DC bias voltage.

10. The working method of the radio frequency power amplifier according to claim 7, characterized in that: The digital-to-analog conversion module simultaneously adjusts the DC bias voltages of the power amplifier tubes of the plurality of power control branches.

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