WO2021227274A1

WO2021227274A1 - Capacitor switching chip and radio-frequency power amplification circuit

Info

Publication number: WO2021227274A1
Application number: PCT/CN2020/108560
Authority: WO
Inventors: 奉靖皓; 倪建兴
Original assignee: 锐石创芯（深圳）科技有限公司
Priority date: 2020-05-11
Filing date: 2020-08-12
Publication date: 2021-11-18
Also published as: CN111293998A; CN111293998B

Abstract

Disclosed are a capacitor switching chip and a radio-frequency power amplification circuit. A capacitor switching chip (1) comprises: an interface module, a first switch module (10), an internal capacitor (C1), and a second switch module (20). When a switch control signal including a power supply mode is received, the interface module performs signal conversion on the switch control signal to obtain a switching signal. The first switch module (10) makes, according to a first signal, a second internal port of the internal capacitor (C1) and an output end (B) of the interface module be in a disconnected state, or makes the second internal port of the internal capacitor (C1) and the output end (B) of the interface module connect by means of the first switch module (10). The second switch module (20) makes, according to a second signal, a second external port of an external capacitor (C2) and the output end (B) of the interface module be in a disconnected state, or makes the second external port of the external capacitor (C2) and the output end (B) of the interface module connect by means of the second switch module (20). The chip realizes the automatic switching of a capacitor for different power supply modes, thereby increasing the flexibility of a circuit design, and reducing design and wiring costs.

Description

Capacitor switching chip and radio frequency power amplifier circuit

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on May 11, 2020, the application number is 202010390550.4, and the invention title is "capacitor switching chip and radio frequency power amplifier circuit", the entire content of which is incorporated into this application by reference middle.

Technical field

This application relates to semiconductor chip technology, in particular to a capacitor switching chip and a radio frequency power amplifier circuit.

Background technique

At present, there are often RF power amplifiers in electronic terminals, mobile terminals, mobile phones and other equipment used in RF communication systems. Since RF power amplifiers can output higher RF output power, RF power amplifiers are an important part of RF connections. In order to ensure better working efficiency of the radio frequency power amplifier, it is required that the working voltage provided to the radio frequency power amplifier be guaranteed. In the prior art, the voltage output by the power supply circuit that provides the working voltage often needs to be adjusted in real time. Commonly used adjustment methods include Average Power Tracking (APT) technology and Envelope Tracking (ET) technology. As the transmission rate of the fifth-generation mobile communication technology (5G) is greatly improved compared to the fourth-generation mobile communication technology (4G), more stringent requirements are imposed on the operating voltage, and a capacitor needs to be loaded on the power supply circuit to ensure the output The voltage is stable to reduce the linear loss of the RF power amplifier, but because different adjustment methods need to be loaded with different capacitors, and different output voltages need to be loaded with different capacitors, the adjustment method or work will be constantly switched during the use of 5G. Voltage, so that it is necessary to design different capacitors and wirings to load the power supply circuit according to different adjustment methods and working voltages, which will take up more space and more wiring, which will cause the circuit board to occupy a large space, increase the cost, and cannot be adjusted. There is no flexibility in the capacitance value of the loaded capacitor.

Summary of the invention

This application provides a capacitance switching chip and a radio frequency power amplifier circuit. This application realizes the automatic switching of the capacitance loaded to the power supply circuit in the radio frequency power amplifier circuit to meet the diversity, flexibility and controllability of the operating voltage of the radio frequency power amplifier. The wiring space of the circuit board is reduced, the circuit cost is reduced, the linear loss of the radio frequency power amplifier is reduced, and the working efficiency of the radio frequency power amplifier is improved.

A capacitor switching chip includes an interface module, a first switch module, an internal capacitor, and a second switch module;

The interface module includes an input terminal, an output terminal, and a signal terminal; the input terminal of the interface module is connected to the first internal port of the internal capacitor, the first switch module, and the second switch module; The output terminal of the interface module is connected to the first switch module and the second switch module; the signal terminal of the interface module is connected to the first switch module and the second switch module; the second switch module of the internal capacitor The internal port is connected to the first switch module; the input end of the interface module is provided with a first port for connecting the first external port of an external capacitor, and the second switch module is provided with a first port for connecting to the external capacitor. The second port of the second external port;

When receiving the switch control signal including the power supply mode, the interface module performs signal conversion on the switch control signal according to the power supply mode, and outputs the switching signal obtained after the conversion through the signal terminal; the switching signal includes The first signal and the second signal;

The first switch module receives the first signal, and causes the second internal port of the internal capacitor and the output terminal of the interface module to be in a disconnected state according to the first signal, or causes the Conduction between the second internal port of the internal capacitor and the output terminal of the interface module is conducted through the first switch module;

The second switch module receives the second signal, and causes the second external port of the external capacitor and the output terminal of the interface module to be in a disconnected state according to the second signal, or causes the external The second external port of the capacitor is connected to the output terminal of the interface module through the second switch module.

A radio frequency power amplifier circuit, including a power supply circuit, a radio frequency power amplifier, a controller, an external capacitor, and the capacitor switching chip;

The capacitor switching chip includes an interface module, a first switch module, an internal capacitor, and a second switch module;

The second switch module receives the second signal, and causes the second external port of the external capacitor and the output terminal of the interface module to be in a disconnected state according to the second signal, or causes the external Conduction between the second external port of the capacitor and the output terminal of the interface module through the second switch module;

The input end of the interface module is connected to the power supply path between the power supply circuit and the radio frequency power amplifier, the output end of the interface module is grounded, and the controller is connected to the power supply circuit and the radio frequency power. An amplifier and a signal terminal of the interface module;

The controller determines the operating voltage associated with the power supply mode that the power supply circuit needs to provide to the RF power amplifier according to the radio frequency signal input to the radio frequency power amplifier, and generates a switch control signal according to the power supply mode of the operating voltage;

According to the switch control signal, the capacitance switching chip controls whether the internal capacitor or/and the external capacitor is connected to the power supply path between the power supply circuit and the radio frequency power amplifier, and is The internal capacitor or/and the external capacitor filter the voltage output from the power supply circuit to the radio frequency power amplifier, and input the working voltage obtained after filtering to the radio frequency power amplifier.

In the capacitor switching chip of the present application, when a switch control signal including a power supply mode is received, the interface module performs signal conversion on the switch control signal according to the power supply mode, and passes the switching signal obtained after the conversion through the signal Terminal output; the switching signal includes a first signal and a second signal; the first switch module receives the first signal, and according to the first signal to make the second internal port of the internal capacitor and the The output terminals of the interface module are in a disconnected state, or the second internal port of the internal capacitor and the output terminal of the interface module are turned on through the first switch module; the second switch module Receiving the second signal, and making the second external port of the external capacitor and the output terminal of the interface module disconnected according to the second signal, or making the second external port of the external capacitor The output terminal of the interface module is connected to the output terminal of the interface module through the second switch module. In this way, it is realized that the internal capacitor or/and the external capacitor can be switched according to the switch control signal containing the working mode to achieve the automatic switching of the capacitor in different power supply modes. As a result, the flexibility of circuit design is increased, and the design and wiring costs are reduced.

In the radio frequency power amplifier circuit of the present application, the controller determines the operating voltage associated with the power supply mode that the power supply circuit needs to provide to the radio frequency power amplifier according to the radio frequency signal input to the radio frequency power amplifier, and according to the operating voltage The power supply mode generates a switch control signal; according to the switch control signal, the capacitance switching chip controls whether the internal capacitor or/and the external capacitor is connected to the power supply between the power supply circuit and the radio frequency power amplifier And filter the voltage output from the power supply circuit to the radio frequency power amplifier through the connected internal capacitor or/and the external capacitor, and input the working voltage obtained after filtering to the radio frequency The power amplifier, in this way, realizes that the switching control signal is generated according to the power supply mode of the working voltage, and then according to the switching control signal, the loaded internal capacitor or/and external capacitor is controlled by the capacitor switching chip, so as to automatically switch the loaded capacitor according to the power supply mode. The best filtering effect is achieved, the wiring space of the circuit board is reduced, the circuit cost is reduced, and the linear loss of the radio frequency power amplifier is reduced, and the working efficiency of the radio frequency power amplifier is improved.

Description of the drawings

In order to explain the technical solutions of the embodiments of the present application more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments of the present application. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative work, other drawings can be obtained based on these drawings.

FIG. 1 is a functional block diagram of a capacitor switching chip in an embodiment of the present application;

FIG. 2 is a flowchart of a capacitor switching chip in an embodiment of the present application;

FIG. 3 is a flowchart of a capacitor switching chip in another embodiment of the present application;

Fig. 4 is a flowchart of a radio frequency power amplifier circuit in an embodiment of the present application;

FIG. 5 is a flowchart of a radio frequency power amplifier circuit in another embodiment of the present application;

Fig. 6 is a flowchart of a radio frequency power amplifier circuit in another embodiment of the present application;

Fig. 7 is a schematic block diagram of a radio frequency power amplifier circuit in an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of them. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

The present application provides a capacitor switching chip 1, which realizes the switching of the internal capacitor C1 or/and the external capacitor C2 according to the switching control signal containing the working mode, achieving the effect of automatically switching the capacitor in different power supply modes, and reducing the design and wiring costs .

In one embodiment, as shown in FIGS. 1 and 2, the capacitance switching chip 1 of the present application includes an interface module, a first switch module 10, an internal capacitor C1, and a second switch module 20; the interface module includes an input terminal A. The output terminal B and the signal terminal C; the input terminal A of the interface module is connected to the first internal port of the internal capacitor C1, the first switch module 10 and the second switch module 20; The output terminal B of the interface module is connected to the first switch module 10 and the second switch module 20; the signal terminal C of the interface module is connected to the first switch module 10 and the second switch module 20; The second internal port of the internal capacitor C1 is connected to the first switch module 10; the input terminal A of the interface module is provided with a first port D for connecting the first external port of the external capacitor C2, and the second switch The module 20 is provided with a second port E for connecting the second external port of the external capacitor C2. The capacitance switching chip 1 includes the following steps S10-S30:

S10: When receiving the switch control signal including the power supply mode, the interface module performs signal conversion on the switch control signal according to the power supply mode, and outputs the switching signal obtained after the conversion through the signal terminal C; The switching signal includes a first signal and a second signal.

Wherein, the interface module includes an input terminal A, an output terminal B, and a signal terminal C; the input terminal A is a port for the capacitance switching chip 1 to connect to the input of a peripheral circuit, and the input terminal A can be connected according to circuit design requirements. In the circuit, the output terminal B is the port through which the capacitance switching chip 1 is connected to the output of the peripheral circuit. The output terminal B can be connected to the circuit according to the circuit design requirements. For example, the input terminal A can be connected to the power supply in the circuit. On the path, the output terminal B is connected to the ground, or the input terminal A can also be connected to the power supply voltage (VCC, Volt Current Condenser), then the output terminal B is connected to the power supply path in the circuit, and the The signal terminal C is a port output to the first switch module 10 and the second switch module 20, and the first switch module 10 switches whether the internal capacitor C1 is loaded into the The input terminal A and the output terminal B are modules, the first switch module 10 can be set according to requirements, and the second switch module 20 switches whether the external capacitor C2 is loaded into the terminal according to the second signal. For the modules of the input terminal A and the output terminal B, the second switch module 20 can be set according to requirements, the external capacitor C2 is a capacitor outside the capacitor switching chip 1, and the external capacitor C2 is connected to the The capacitance switching chip 1 is connected, the capacitance switching chip 1 is connected to the external capacitor C2 through the first port D and the second port E, and the first internal port of the internal capacitor C1 is One port, the second internal port of the internal capacitor C1 is the other port of the internal capacitor C1, for example: the internal capacitor C1 is a polar capacitor, and the first internal port of the internal capacitor C1 is a polar capacitor. The positive electrode of the external capacitor, the second internal port of the internal capacitor C1 is the negative electrode of the polar capacitor, the first external port of the external capacitor C2 is a port of the external capacitor C2, and the second internal port of the external capacitor C2 The external port is another port of the external capacitor C2, for example: the external capacitor C2 is a polar capacitor, the first external port of the external capacitor C2 is the positive pole of the polar capacitor, and the second external port of the external capacitor C2 is a polar capacitor The negative electrode.

Understandably, the power supply mode can be set according to requirements. For example, the power supply mode includes an average power tracking operating mode and an envelope tracking operating mode, etc., wherein the average power tracking operating mode is application average power tracking ( Average Power Tracking (APT) technology, the average power tracking technology is a technology that automatically adjusts the operating voltage of the RF power amplifier according to the output power of the RF power amplifier in combination with the parameters of the RF power amplifier, and the envelope tracking operating mode In order to apply the envelope tracking (Envelope Tracking, ET) technology working mode, the envelope tracking technology is to establish a connection between the working voltage of the radio frequency power amplifier and the input radio frequency signal so that they can follow each other in real time, thereby improving the radio frequency power amplifier The work efficiency technology, the switch control signal is a number of basic logic level information, that is, information composed of multiple basic logic "0" or "1", where the logic "0" represents low level, the logic "1" represents a high level. The number of bits of the switch control signal can be set according to requirements. The control signal performs signal conversion to obtain the switching signal, the interface module further includes a control terminal, the interface module receives the switch control signal through the control terminal, and the interface module manages the signal of the capacitance switching chip 1 Input or signal output port, the switching signal includes the first signal and the second signal, the switching signal is output through the signal terminal C, the first signal and the second signal are both one Bit basic logic level information. In one embodiment, the switch control signal is input to the decoder in the interface module. The decoder is a component that converts one input into two outputs. The decoder decodes the switch control signal to obtain the first signal and the second signal. For example, the switch control signal is "01". After the decoder, the first signal is "0" and the second signal is "1".

S20, the first switch module 10 receives the first signal, and causes the second internal port of the internal capacitor C1 to be disconnected from the output terminal B of the interface module according to the first signal State, or make the first switch module 10 conduct between the second internal port of the internal capacitor C1 and the output terminal B of the interface module.

Understandably, the internally connected capacitor C1 is a fixed capacitor in the capacitor switching chip 1. The capacitance value of the internally connected capacitor C1 can be set according to requirements, and the internally connected capacitor C1 can also be composed of multiple capacitors. The first switch module 10 switches whether the internal capacitor C1 is loaded into the input terminal A and the output terminal B according to the first signal.

In one embodiment, the first switch module 10 includes a first PNP-type transistor and a first NPN-type transistor; the base of the first PNP-type transistor and the base of the first NPN-type transistor are both the same as those of the first PNP-type transistor. The signal terminal C is connected, the emitter of the first PNP transistor and the collector of the first NPN transistor are both connected to the second internal port of the internal capacitor C1, and the first PNP transistor The collector of is connected to the input terminal A, and the emitter of the first NPN transistor is connected to the output terminal B; after receiving the first signal, the first switch module 10 detects the first signal Whether it is low level; when the first signal is low level, the first PNP type transistor is turned on and the first NPN type transistor is turned off, so that the second internal port of the internal capacitor C1 is connected to the interface module When the first signal is at a high level, the first PNP-type transistor is cut off and the first NPN-type transistor is turned on, so that the second internal connection of the internal capacitor C1 The connection port and the output terminal B of the interface module are conducted through a first NPN transistor.

In an embodiment, as shown in FIGS. 1 and 3, the first switch module 10 includes a first P-type field effect transistor P1 and a first N-type field effect transistor N1; the first P-type field effect transistor The gate of P1 and the gate of the first N-type field effect transistor N1 are both connected to the signal terminal C, and the source of the first P-type field effect transistor P1 and the first N-type field effect transistor The drains of N1 are all connected to the second internal connection port of the internal connection capacitor C1, the drain of the first P-type field effect transistor P1 is connected to the input terminal A, and the first N-type field effect transistor The source of N1 is connected to the output terminal B; in the step S20, the first switch module 10 receives the first signal, and according to the first signal, causes the second signal of the internal capacitor C1 to The internal connection port and the output terminal B of the interface module are in a disconnected state, or the second internal connection port of the internal connection capacitor C1 and the output terminal B of the interface module pass through the first switch module 10 Conduction, including:

S201: After receiving the first signal, the first switch module 10 detects whether the first signal is at a low level.

S202: When the first signal is at a low level, the first P-type field effect transistor P1 is turned on and the first N-type field effect transistor N1 is turned off, so that the second internal port of the internal capacitor C1 and The output terminals B of the interface module are in a disconnected state.

Understandably, when the first signal is at a low level, the first P-type field effect transistor P1 is turned on and the first N-type field effect transistor N1 is turned off, so that the internal capacitor C1 is not loaded into The input terminal A and the output terminal B, that is, no current flows through the internal capacitor C1, nor does it cause the second internal port of the internal capacitor C1 to float, and the internal capacitor C1 does not appear. Stable jitter phenomenon.

S203: When the first signal is at a high level, the first P-type field effect transistor P1 is turned off and the first N-type field effect transistor N1 is turned on, so that the second internal port of the internal capacitor C1 is connected to The output terminals B of the interface module are turned on through the first N-type field effect transistor N1.

Understandably, when the first signal is at a high level, the first P-type field effect transistor P1 is turned off and the first N-type field effect transistor N1 is turned on, so that the internally connected capacitor C1 is loaded into the The input terminal A and the output terminal B, that is, the internal connection capacitor C1 has current flowing through it.

S30, the second switch module 20 receives the second signal, and causes the second external port of the external capacitor C2 to be in a disconnected state with the output terminal B of the interface module according to the second signal, Or, the second external port of the external capacitor C2 and the output terminal B of the interface module are connected through the second switch module 20.

Understandably, the capacitance value of the external capacitor C2 can be set according to requirements, the external capacitor C2 can also be composed of multiple capacitors, such as 0.1 pF, 100 μF, etc., and the second switch module 20 is based on the The second signal switches whether the external capacitor C2 is loaded into the input terminal A and the output terminal B. Since the external capacitor C2 is an off-chip capacitor, it can be flexibly set in the subsequent development, and the design is increased Flexibility.

In an embodiment, the second switch module 20 includes a second PNP-type transistor and a second NPN-type transistor; the base of the second PNP-type transistor and the base of the second NPN-type transistor are both the same as those of the second PNP-type transistor. The signal terminal C is connected, the emitter of the second PNP transistor and the collector of the second NPN transistor are both connected to the second external port of the external capacitor C2, and the collector of the second PNP transistor The electrode is connected to the input terminal A, and the emitter of the second NPN transistor is connected to the output terminal B; after receiving the second signal, the second switch module 20 detects whether the second signal is Low level; when the second signal is low, the second PNP type transistor is turned on and the second NPN type transistor is turned off, so that the second external port of the external capacitor C2 and the output terminal B of the interface module When the second signal is at a high level, the second PNP-type transistor is turned off and the second NPN-type transistor is turned on, so that the second external port of the external capacitor C2 is connected to the interface The output terminals B of the module are conducted through the second NPN transistor.

In an embodiment, the second switch module 20 includes a second P-type field effect transistor P2 and a second N-type field effect transistor N2; the gate of the second P-type field effect transistor P2 and the second The gate of the N-type field effect transistor N2 is connected to the signal terminal C, and the source of the second P-type field effect transistor P2 and the drain of the second N-type field effect transistor N2 are both connected to the external The second external port of the capacitor C2 is connected, the drain of the second P-type field effect transistor P2 is connected to the input terminal A, and the source of the second N-type field effect transistor N2 is connected to the output terminal B In step S30, that is, the second switch module 20 receives the second signal, and according to the second signal makes the second external port of the external capacitor C2 and the output terminal B of the interface module Or the second external port of the external capacitor C2 and the output terminal B of the interface module are turned on through the second switch module 20, including:

S301: After receiving the second signal, the second switch module 20 detects whether the second signal is at a low level.

S302: When the second signal is at a low level, the second P-type field effect transistor P2 is turned on and the second N-type field effect transistor N2 is turned off, so that the second external port of the external capacitor C2 is connected to the The output terminals B of the interface module are in a disconnected state.

Understandably, when the second signal is at a low level, the second P-type field effect transistor P2 is turned on and the second N-type field effect transistor N2 is turned off, so that the external capacitor C2 is not loaded into the The input terminal A and the output terminal B, that is, no current flows through the external capacitor C2, and the second external port of the external capacitor C2 is not placed in a floating state, so as to avoid unstable jitter of the external capacitor C2 Phenomenon.

S303: When the second signal is at a high level, the second P-type field effect transistor P2 is turned off and the second N-type field effect transistor N2 is turned on, so that the second external port of the external capacitor C2 is connected to the The output terminals B of the interface module are turned on through the second N-type field effect transistor N2.

Understandably, when the second signal is at a high level, the second P-type field effect transistor P2 is turned off and the second N-type field effect transistor N2 is turned on, so that the external capacitor C2 is loaded into the Current flows through the input terminal A and the output terminal B, that is, the external capacitor C2.

In an embodiment, the interface module further includes a first expansion terminal for connecting to the first expansion port of the expansion capacitor bank and a second expansion terminal for connecting to the second expansion port of the expansion capacitor bank, connected to The expansion capacitor group of the first expansion terminal and the second expansion terminal and the external capacitor C2, the parallel expansion capacitor group and the external capacitor C2 form an external expansion group; after the step S30, that is After the second switch module 20 receives the second signal, it includes:

S304. Disconnect the second external expansion port of the external expansion group and the output terminal B of the interface module according to the second signal, or make the second external expansion port of the external expansion group and The output terminals B of the interface module are conducted through the second switch module 20.

Understandably, the external expansion group includes the expansion capacitor group and the external capacitor C2, the expansion capacitor group includes a plurality of capacitors, the capacitors in the expansion capacitor group are connected in parallel, and the first expansion of the expansion capacitor group The port is one port of a plurality of capacitors connected in parallel, the second expansion port of the expansion capacitor group is another port opposite to the first expansion port of the expansion capacitor group, and the external expansion group is switched according to the second signal Whether to load the input terminal A and the output terminal B, because the external expansion group is a capacitor group that increases or decreases the capacitance value outside the chip, the capacitor can be flexibly adjusted in the subsequent development, which increases the flexibility of the design sex.

In an embodiment, the second switch module 20 includes a second P-type field effect transistor P2 and a second N-type field effect transistor N2; the gate of the second P-type field effect transistor P2 and the second The gate of the N-type field effect transistor N2 is connected to the signal terminal C, and the source of the second P-type field effect transistor P2 and the drain of the second N-type field effect transistor N2 are both connected to the external The second external expansion port of the expansion group is connected, the drain of the second P-type field effect transistor P2 is connected to the input terminal A, and the source of the second N-type field effect transistor N2 is connected to the output terminal B Connection; In step S304, the second external expansion port of the external expansion group and the output terminal B of the interface module are in a disconnected state according to the second signal, or the external expansion group The conduction between the second external expansion port and the output terminal B of the interface module through the second switch module 20 includes:

S3041: After receiving the second signal, the second switch module 20 detects whether the second signal is a low level.

S3042: When the second signal is at a low level, the second P-type field effect transistor P2 is turned on and the second N-type field effect transistor N2 is turned off, so that the second external expansion port of the external expansion group is The output terminals B of the interface module are in a disconnected state.

Understandably, when the second signal is at a low level, the second P-type field effect transistor P2 is turned on and the second N-type field effect transistor N2 is turned off, so that the external expansion group is not loaded into the The input terminal A and the output terminal B, that is, no current flows through the external expansion group, and the second external expansion port of the external expansion group is not placed in a floating state, so as to prevent the external expansion group from being unstable Jitter phenomenon.

S3043: When the second signal is at a high level, the second P-type field effect transistor P2 is turned off and the second N-type field effect transistor N2 is turned on, so that the second external expansion port of the external expansion group is connected to the The output terminals B of the interface module are turned on through the second N-type field effect transistor N2.

Understandably, when the second signal is at a low level, the second P-type field effect transistor P2 is turned off and the second N-type field effect transistor N2 is turned on, so that the external expansion group is loaded into the Current flows through the input terminal A and the output terminal B, that is, the external expansion group.

In the capacitor switching chip 1 of the present application, when a switch control signal including a power supply mode is received, the interface module performs signal conversion on the switch control signal according to the power supply mode, and passes the switching signal obtained after the conversion through the switch control signal. The signal terminal C is output; the switching signal includes a first signal and a second signal; the first switch module 10 receives the first signal, and according to the first signal causes the second internal of the internal capacitor C1 The connection port and the output terminal B of the interface module are in a disconnected state, or the second internal connection port of the internal connection capacitor C1 and the output terminal B of the interface module are conducted through the first switch module 10 The second switch module 20 receives the second signal, and according to the second signal makes the second external port of the external capacitor C2 and the output terminal B of the interface module in a disconnected state, Or the second external port of the external capacitor C2 and the output terminal B of the interface module are turned on through the second switch module 20, so that the internal capacitor C1 is switched according to the switch control signal containing the working mode. Or/and an external capacitor C2 to achieve the effect of automatically switching capacitors in different power supply modes, which increases the flexibility of circuit design and reduces design and wiring costs.

This application provides a radio frequency power amplifier circuit 2, which realizes that a switch control signal is generated according to the power supply mode of the working voltage, and then according to the switch control signal, the loaded internal capacitor C1 or/and the external capacitor C2 are controlled by the capacitor switching chip 1 to achieve The loaded capacitor is automatically switched according to the power supply mode to achieve the best filtering effect, reducing the wiring space of the circuit board, reducing the circuit cost, and reducing the linear loss of the RF power amplifier 22, and improving the working efficiency of the RF power amplifier 22.

In an embodiment, as shown in FIGS. 4 and 7, the RF power amplifier circuit 2 of the present application includes a power supply circuit 21, an RF power amplifier 22, a controller 23, an external capacitor C2, and the above-mentioned capacitor switching chip 1; The input terminal A of the interface module is connected to the power supply path between the power supply circuit 21 and the radio frequency power amplifier 22, the output terminal B of the interface module is grounded, and the controller 23 is connected to the power supply circuit 21, The radio frequency power amplifier 22 and the signal terminal C of the interface module. The radio frequency power amplifier circuit 2 includes the following steps S100-S200:

S100. The controller 23 determines, according to the radio frequency signal input to the radio frequency power amplifier 22, the working voltage associated with the power supply mode that the power supply circuit 21 needs to provide to the radio frequency power amplifier 22, and according to the power supply mode of the working voltage Generate switch control signal.

Understandably, the controller 23 is connected to the power supply circuit 21, the radio frequency power amplifier 22, and the signal terminal C of the interface module, and the power supply circuit 21 is a voltage source in the radio frequency power amplifier circuit 2. The radio frequency power amplifier 22 is a component that amplifies the power of the input radio frequency signal. The power supply circuit 21 includes a plurality of the power supply modes. The power supply modes include an average power tracking operation mode and an envelope tracking operation mode. The power supply modes correspond to different voltage signals, and the different power supply modes are associated with different working voltages. The voltage signal is the voltage value output by the power supply circuit 21, and the working voltage is the radio frequency power. The amplifier 22 needs a voltage to work in the associated power supply mode. The controller 23 generates the switch control signal according to the power supply mode of the operating voltage. For example, the power supply mode is an average power tracking operating mode, and the controller 23 The generated switch control signal is "11".

The power supply path between the power supply circuit 21 and the radio frequency power amplifier 22 is a circuit connection path for the power supply circuit 21 to supply power to the radio frequency power amplifier 22.

In an embodiment, after the step S100, that is, after the switch control signal is generated according to the power supply mode of the working voltage, the method further includes:

S1001. When the power supply mode in the switch control signal is the average power tracking operating mode, the capacitor switching chip 1 connects both the internal capacitor C1 and the external capacitor C2 according to the average power tracking operating mode On the power supply path between the power supply circuit 21 and the radio frequency power amplifier 22, the power supply circuit 21 is output to the radio frequency power amplifier 22 through the connected internal capacitor C1 and the external capacitor C2. After filtering the voltage of, the working voltage obtained after filtering is input to the radio frequency power amplifier 22, so that the radio frequency power amplifier 22 controls the power change in the average power tracking working mode.

Understandably, when the power supply mode in the switch control signal is the average power tracking operating mode, the capacitor switching chip 1 connects the internal capacitor C1 and the external capacitor C2 to the power supply circuit 21 and On the power supply path between the radio frequency power amplifiers 22, after filtering the voltage output from the power supply circuit 21 to the radio frequency power amplifier 22 through the internal capacitor C1 and the external capacitor C2, the voltage obtained after filtering is obtained The operating voltage of is input to the RF power amplifier 22, so that the RF power amplifier 22 applies the average power tracking technology to control the power change in the average power tracking operating mode.

S1002, when the power supply mode in the switch control signal is the envelope tracking working mode, when the capacitance switching chip 1 makes the internal capacitor C1 and the external capacitor C2 not connected according to the switch control signal On the power supply path between the power supply circuit 21 and the radio frequency power amplifier 22, the voltage output by the power supply circuit 21 is directly input to the radio frequency power amplifier 22, so that the radio frequency power amplifier 22 is in the package Control power changes in network tracking mode.

Understandably, when the power supply mode in the switch control signal is the envelope tracking working mode, the capacitance switching chip 1 does not connect the internal capacitor C1 and the external capacitor C2 to the power supply circuit 21. On the power supply path between the RF power amplifier 22 and the power supply circuit 21, the voltage output by the power supply circuit 21 is directly input to the RF power amplifier 22, so that the RF power amplifier 22 works in the envelope tracking mode Envelope tracking technology is used to control power changes.

S200. According to the switch control signal, the capacitance switching chip 1 controls whether the internal capacitor C1 or/and the external capacitor C2 is connected to the power supply path between the power supply circuit 21 and the radio frequency power amplifier 22 And filter the voltage output from the power supply circuit 21 to the radio frequency power amplifier 22 through the connected internal capacitor C1 or/and the external capacitor C2, and input the working voltage obtained after filtering to The radio frequency power amplifier 22.

In the radio frequency power amplifier circuit 2 of the present application, the controller 23 determines the operating voltage associated with the power supply mode that the power supply circuit 21 needs to provide to the radio frequency power amplifier 22 according to the radio frequency signal input to the radio frequency power amplifier 22, and According to the power supply mode of the operating voltage, a switch control signal is generated; according to the switch control signal, the capacitance switching chip 1 controls whether the internal capacitor C1 or/and the external capacitor C2 is connected to the power supply circuit 21 and On the power supply path between the radio frequency power amplifiers 22, the voltage output from the power supply circuit 21 to the radio frequency power amplifier 22 is performed through the connected internal capacitor C1 or/and the external capacitor C2. Filtering, the working voltage obtained after filtering is input to the radio frequency power amplifier 22, in this way, a switch control signal is generated according to the power supply mode of the working voltage, and then according to the switch control signal, the loaded internal capacitor is controlled by the capacitor switching chip 1 C1 or/and the external capacitor C2 can automatically switch the loaded capacitor according to the power supply mode to achieve the best filtering effect, reduce the wiring space of the circuit board, reduce the circuit cost, and reduce the linear loss of the RF power amplifier 22, and improve The working efficiency of the radio frequency power amplifier 22 is improved.

In one embodiment, as shown in FIGS. 5 and 7, the radio frequency power amplifier circuit 2 includes at least two capacitance switching chips 1; each of the capacitance switching chips 1 passes through a first port D and a first port D The two ports E are connected to a different external capacitor C2; the input terminals A of the interface modules in all the capacitor switching chips 1 are connected to a common node, and the common node is located between the power supply circuit 21 and the radio frequency power amplifier On the power supply path between 22; the radio frequency power amplifier circuit 2 includes the following steps S110-S120:

S110: The controller 23 generates a chip control signal according to the voltage signal output by the power supply circuit 21; the chip control signal is used to determine that the capacitance switching chip that can receive the switch control signal needs to be selected under the voltage signal The number of 1.

Understandably, the voltage signal is the voltage output by the power supply circuit 21, the chip control signal is that the controller 23 generates a signal corresponding to the voltage signal according to the voltage signal, and the chip control signal is determined by It is composed of multiple basic logic levels, and the number of bits of the chip control signal can be determined according to the number of the capacitance switching chips 1.

In an embodiment, as shown in FIGS. 6 and 7, in step S110, that is, the controller 23 generates a chip control signal according to the voltage signal output by the power supply circuit 21, including:

S1101: The controller 23 periodically collects the voltage signal, and obtains the collected voltage value within a preset time period before the collection time point.

Understandably, the controller 23 periodically collects the voltage signal, the collection method can be set according to requirements, and the timing can be set according to the requirements of the length of the time interval, and the collection time point is the output The time point at which the voltage value is collected, the preset time period can be set according to requirements, for example, the collection method is to periodically collect a plurality of voltage values within the preset time period, and average the collected voltage values Value to obtain the collected voltage value, or remove the maximum value and the minimum value from the collected voltage value and then take the average value to obtain the collected voltage value.

S1102: According to the collected voltage value, generate the chip control signal corresponding to the collected voltage value.

Understandably, according to the magnitude of the collected voltage value, the chip control signal corresponding to the collected voltage value is matched, and the chip control signal is generated, for example: the collected voltage value is 3.3V, and the chip control signal is generated Is "0001", the collected voltage value is 5V, and the generated chip control model is "0010".

S120. After the capacitance switching chip 1 is selected according to the chip control signal, the selected capacitance switching chip 1 receives a switching control signal, and selects the internal capacitor in the capacitance switching chip 1 according to the switching control signal. Whether the connecting capacitor C1 and/or the external capacitor C2 is connected to the common node, and all the internal capacitors C1 and/or the external capacitor C2 connected to the common node are used to provide the power supply circuit 21 with the radio frequency power The voltage output by the amplifier 22 is filtered, and the working voltage obtained after the filtering is input to the radio frequency power amplifier 22.

Understandably, after the capacitance switching chip 1 is selected according to the chip control signal, the selected capacitance switching chip 1 receives a switch control signal, and selects all of the capacitance switching chip 1 according to the switch control signal. Whether the internal capacitor C1 and/or the external capacitor C2 is connected to the common node, so that the output of the power supply circuit 21 to the radio frequency power amplifier 22 can be adjusted without processing the circuit board. The voltage filtering effect satisfies the need to adjust the capacitance of the capacitor to filter the working voltage according to different working voltages, which improves the flexibility of circuit design.

The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application. Should be covered within the scope of protection of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claims.

Claims

A capacitor switching chip, which includes an interface module, a first switch module, an internal capacitor, and a second switch module;

The interface module includes an input terminal, an output terminal, and a signal terminal; the input terminal of the interface module is connected to the first internal port of the internal capacitor, the first switch module, and the second switch module; The output terminal of the interface module is connected to the first switch module and the second switch module; the signal terminal of the interface module is connected to the first switch module and the second switch module; the second switch module of the internal capacitor The internal port is connected to the first switch module; the input end of the interface module is provided with a first port for connecting the first external port of an external capacitor, and the second switch module is provided with a first port for connecting to the external capacitor. The second port of the second external port;

When receiving the switch control signal including the power supply mode, the interface module performs signal conversion on the switch control signal according to the power supply mode, and outputs the switching signal obtained after the conversion through the signal terminal; the switching signal includes The first signal and the second signal;

The first switch module receives the first signal, and causes the second internal port of the internal capacitor and the output terminal of the interface module to be in a disconnected state according to the first signal, or causes the Conduction between the second internal port of the internal capacitor and the output terminal of the interface module is conducted through the first switch module;

The second switch module receives the second signal, and causes the second external port of the external capacitor and the output terminal of the interface module to be in a disconnected state according to the second signal, or causes the external The second external port of the capacitor is connected to the output terminal of the interface module through the second switch module.
The capacitor switching chip according to claim 1, wherein the interface module further comprises a first expansion terminal for connecting the first expansion port of the expansion capacitor group and a second expansion port for connecting the expansion capacitor group The second expansion terminal, the expansion capacitor group and the external capacitor connected to the first expansion terminal and the second expansion terminal, and the parallel expansion capacitor group and the external capacitor form an external expansion group.
The capacitance switching chip of claim 2, wherein after the second switch module receives the second signal, the second external expansion port of the external expansion group is caused to interact with the interface module according to the second signal The output terminals of the external expansion group are in a disconnected state, or the second external expansion port of the external expansion group and the output terminal of the interface module are turned on through the second switch module.
The capacitance switching chip of claim 3, wherein the second switch module includes a second P-type field effect transistor and a second N-type field effect transistor; the gate of the second P-type field effect transistor and the The gate of the second N-type field effect transistor is connected to the signal terminal, and the source of the second P-type field effect transistor and the drain of the second N-type field effect transistor are both connected to the external capacitor Connected to the second external port of the second P-type field effect transistor, the drain of the second P-type field effect transistor is connected to the input terminal, and the source of the second N-type field effect transistor is connected to the output terminal;

After the second switch module receives the second signal, the method includes:

Detecting whether the second signal is low level;

When the second signal is at a low level, the second P-type field effect transistor is turned on and the second N-type field effect transistor is turned off, so that the second external port of the external capacitor is connected to the output terminal of the interface module Is in a disconnected state between;

When the second signal is at a high level, the second P-type field effect transistor is turned off and the second N-type field effect transistor is turned on, so that the second external port of the external capacitor is connected to the output terminal of the interface module It is turned on through the second N-type field effect transistor.
The capacitance switching chip of claim 3, wherein the second switch module includes a second P-type field effect transistor and a second N-type field effect transistor; the gate of the second P-type field effect transistor and the The gate of the second N-type field effect transistor is connected to the signal terminal, and the source of the second P-type field effect transistor and the drain of the second N-type field effect transistor are both connected to the external expansion The second external expansion port of the group is connected, the drain of the second P-type field effect transistor is connected to the input terminal, and the source of the second N-type field effect transistor is connected to the output terminal;

After the second switch module receives the second signal, the method includes:

Detecting whether the second signal is low level;

When the second signal is at a low level, the second P-type field effect transistor is turned on and the second N-type field effect transistor is turned off, so that the second external expansion port of the external expansion group and the interface module The output terminals are in a disconnected state;

When the second signal is at a high level, the second P-type field effect transistor is turned off and the second N-type field effect transistor is turned on, so that the second external expansion port of the external expansion group and the interface module The output terminals are turned on through the second N-type field effect transistor.
The capacitance switching chip of claim 1, wherein the first switch module includes a first P-type field effect transistor and a first N-type field effect transistor; the gate of the first P-type field effect transistor and the The gate of the first N-type field effect transistor is connected to the signal terminal, and the source of the first P-type field effect transistor and the drain of the first N-type field effect transistor are both connected to the internal The second internal port of the capacitor is connected, the drain of the first P-type field effect transistor is connected to the input terminal, and the source of the first N-type field effect transistor is connected to the output terminal.
7. The capacitance switching chip of claim 6, wherein, after the first switch module receives the first signal, it comprises:

Detecting whether the first signal is low level;

When the first signal is at a low level, the first P-type field effect transistor is turned on and the first N-type field effect transistor is turned off, so that the second internal port of the internal capacitor and the interface module The output terminals are in a disconnected state;

When the first signal is at a high level, the first P-type field effect transistor is turned off and the first N-type field effect transistor is turned on, so that the second internal port of the internal capacitor and the interface module The output terminals are turned on through the first N-type field effect transistor.
The capacitance switching chip of claim 7, wherein the second switch module includes a second P-type field effect transistor and a second N-type field effect transistor; the gate of the second P-type field effect transistor and the The gate of the second N-type field effect transistor is connected to the signal terminal, and the source of the second P-type field effect transistor and the drain of the second N-type field effect transistor are both connected to the external capacitor Connected to the second external port of the second P-type field effect transistor, the drain of the second P-type field effect transistor is connected to the input terminal, and the source of the second N-type field effect transistor is connected to the output terminal;

After the second switch module receives the second signal, the method includes:

Detecting whether the second signal is low level;

When the second signal is at a low level, the second P-type field effect transistor is turned on and the second N-type field effect transistor is turned off, so that the second external port of the external capacitor is connected to the output terminal of the interface module Is in a disconnected state between;

When the second signal is at a high level, the second P-type field effect transistor is turned off and the second N-type field effect transistor is turned on, so that the second external port of the external capacitor is connected to the output terminal of the interface module It is turned on through the second N-type field effect transistor.
The capacitance switching chip of claim 1, wherein the second switch module includes a second P-type field effect transistor and a second N-type field effect transistor; the gate of the second P-type field effect transistor and the The gate of the second N-type field effect transistor is connected to the signal terminal, and the source of the second P-type field effect transistor and the drain of the second N-type field effect transistor are both connected to the external capacitor Connected to the second external port of the second P-type field effect transistor, the drain of the second P-type field effect transistor is connected to the input terminal, and the source of the second N-type field effect transistor is connected to the output terminal;

After the second switch module receives the second signal, the method includes:

Detecting whether the second signal is low level;

When the second signal is at a low level, the second P-type field effect transistor is turned on and the second N-type field effect transistor is turned off, so that the second external port of the external capacitor is connected to the output terminal of the interface module Is in a disconnected state between;

When the second signal is at a high level, the second P-type field effect transistor is turned off and the second N-type field effect transistor is turned on, so that the second external port of the external capacitor is connected to the output terminal of the interface module It is turned on through the second N-type field effect transistor.
A radio frequency power amplifier circuit, which includes a power supply circuit, a radio frequency power amplifier, a controller, an external capacitor, and the capacitor switching chip;

The capacitor switching chip includes an interface module, a first switch module, an internal capacitor, and a second switch module;

The interface module includes an input terminal, an output terminal, and a signal terminal; the input terminal of the interface module is connected to the first internal port of the internal capacitor, the first switch module, and the second switch module; The output terminal of the interface module is connected to the first switch module and the second switch module; the signal terminal of the interface module is connected to the first switch module and the second switch module; the second switch module of the internal capacitor The internal port is connected to the first switch module; the input end of the interface module is provided with a first port for connecting the first external port of an external capacitor, and the second switch module is provided with a first port for connecting to the external capacitor. The second port of the second external port;

When receiving the switch control signal including the power supply mode, the interface module performs signal conversion on the switch control signal according to the power supply mode, and outputs the switching signal obtained after the conversion through the signal terminal; the switching signal includes The first signal and the second signal;

The first switch module receives the first signal, and causes the second internal port of the internal capacitor and the output terminal of the interface module to be in a disconnected state according to the first signal, or causes the Conduction between the second internal port of the internal capacitor and the output terminal of the interface module is conducted through the first switch module;

The second switch module receives the second signal, and causes the second external port of the external capacitor and the output terminal of the interface module to be in a disconnected state according to the second signal, or causes the external Conduction between the second external port of the capacitor and the output terminal of the interface module through the second switch module;

The input end of the interface module is connected to the power supply path between the power supply circuit and the radio frequency power amplifier, the output end of the interface module is grounded, and the controller is connected to the power supply circuit and the radio frequency power. An amplifier and a signal terminal of the interface module;

The controller determines the operating voltage associated with the power supply mode that the power supply circuit needs to provide to the RF power amplifier according to the radio frequency signal input to the radio frequency power amplifier, and generates a switch control signal according to the power supply mode of the operating voltage;

According to the switch control signal, the capacitance switching chip controls whether the internal capacitor or/and the external capacitor is connected to the power supply path between the power supply circuit and the radio frequency power amplifier, and is The internal capacitor or/and the external capacitor filter the voltage output from the power supply circuit to the radio frequency power amplifier, and input the working voltage obtained after filtering to the radio frequency power amplifier.
10. The radio frequency power amplifier circuit of claim 10, wherein after said generating a switch control signal according to the power supply mode of the operating voltage, the method further comprises:

When the power supply mode in the switch control signal is the average power tracking operating mode, the capacitor switching chip connects the internal capacitor and the external capacitor to the power supply circuit and the power supply circuit according to the average power tracking operating mode. On the power supply path between the radio frequency power amplifiers, after the voltage output from the power supply circuit to the radio frequency power amplifier is filtered by the connected internal capacitor and the external capacitor, the voltage obtained after filtering is filtered The operating voltage is input to the radio frequency power amplifier, so that the radio frequency power amplifier controls power changes in the average power tracking operating mode.
10. The radio frequency power amplifier circuit of claim 10, wherein after said generating a switch control signal according to the power supply mode of the operating voltage, the method further comprises:

When the power supply mode in the switch control signal is the envelope tracking working mode, the capacitance switching chip makes the internal capacitor and the external capacitor not connect to the power supply circuit and the external capacitor according to the switch control signal. On the power supply path between the radio frequency power amplifiers, the voltage output by the power supply circuit is directly input to the radio frequency power amplifier, so that the radio frequency power amplifier controls power changes in the envelope tracking working mode.
The radio frequency power amplifying circuit of claim 10, wherein the radio frequency power amplifying circuit includes at least two of the capacitance switching chips; each of the capacitance switching chips is connected to a different one through a first port and a second port.的 external capacitor;

The input terminals of the interface modules in all the capacitance switching chips are connected to a common node, and the common node is located on the power supply path between the power supply circuit and the radio frequency power amplifier;

The controller generates a chip control signal according to the voltage signal output by the power supply circuit; the chip control signal is used to determine the number of the capacitance switching chips that can receive the switch control signal under the voltage signal;

After the capacitance switching chip is selected according to the chip control signal, the selected capacitance switching chip receives the switching control signal, and selects the internal capacitor and/or the internal capacitor in the capacitance switching chip according to the switching control signal. Whether the external capacitor is connected to the common node, and filter the voltage output from the power supply circuit to the radio frequency power amplifier through all the internal capacitors and/or external capacitors connected to the common node. The obtained working voltage is input to the radio frequency power amplifier.
10. The radio frequency power amplifier circuit of claim 10, wherein the controller generates a chip control signal according to the voltage signal output by the power supply circuit, comprising:

The controller periodically collects the voltage signal, and obtains the collected voltage value in a preset time period before the collection time point;

According to the collected voltage value, the chip control signal corresponding to the collected voltage value is generated.
The radio frequency power amplifier circuit of claim 10, wherein the interface module further comprises a first expansion port for connecting the first expansion port of the expansion capacitor bank and a second expansion port for connecting the expansion capacitor bank The second expansion terminal is connected to the expansion capacitor group and the external capacitor connected to the first expansion terminal and the second expansion terminal, and the expansion capacitor group and the external capacitor connected in parallel form an external expansion group.
The radio frequency power amplifier circuit of claim 15, wherein after the second switch module receives the second signal, the second external expansion port of the external expansion group is caused to communicate with the interface according to the second signal The output terminals of the modules are in a disconnected state, or the second external expansion port of the external expansion group and the output terminal of the interface module are turned on through the second switch module.
The radio frequency power amplifier circuit of claim 16, wherein the second switch module comprises a second P-type field effect transistor and a second N-type field effect transistor; the gate of the second P-type field effect transistor and The gate of the second N-type field effect transistor is connected to the signal terminal, and the source of the second P-type field effect transistor and the drain of the second N-type field effect transistor are both connected to the external The second external port of the capacitor is connected, the drain of the second P-type field effect transistor is connected to the input terminal, and the source of the second N-type field effect transistor is connected to the output terminal;

After the second switch module receives the second signal, the method includes:

Detecting whether the second signal is low level;

When the second signal is at a low level, the second P-type field effect transistor is turned on and the second N-type field effect transistor is turned off, so that the second external port of the external capacitor is connected to the output terminal of the interface module Is in a disconnected state between;

When the second signal is at a high level, the second P-type field effect transistor is turned off and the second N-type field effect transistor is turned on, so that the second external port of the external capacitor is connected to the output terminal of the interface module It is turned on through the second N-type field effect transistor.
The radio frequency power amplifier circuit of claim 16, wherein the second switch module comprises a second P-type field effect transistor and a second N-type field effect transistor; the gate of the second P-type field effect transistor and The gate of the second N-type field effect transistor is connected to the signal terminal, and the source of the second P-type field effect transistor and the drain of the second N-type field effect transistor are both connected to the external The second external expansion port of the expansion group is connected, the drain of the second P-type field effect transistor is connected to the input terminal, and the source of the second N-type field effect transistor is connected to the output terminal;

After the second switch module receives the second signal, the method includes:

Detecting whether the second signal is low level;

When the second signal is at a low level, the second P-type field effect transistor is turned on and the second N-type field effect transistor is turned off, so that the second external expansion port of the external expansion group and the interface module The output terminals are in a disconnected state;

When the second signal is at a high level, the second P-type field effect transistor is turned off and the second N-type field effect transistor is turned on, so that the second external expansion port of the external expansion group and the interface module The output terminals are turned on through the second N-type field effect transistor.
The radio frequency power amplifier circuit of claim 10, wherein the first switch module comprises a first P-type field effect transistor and a first N-type field effect transistor; the gate of the first P-type field effect transistor and The gate of the first N-type field effect transistor is connected to the signal terminal, and the source of the first P-type field effect transistor and the drain of the first N-type field effect transistor are both connected to the inner The second internal port of the capacitor is connected, the drain of the first P-type field effect transistor is connected to the input terminal, and the source of the first N-type field effect transistor is connected to the output terminal.
The radio frequency power amplifier circuit of claim 19, wherein, after the first switch module receives the first signal, it comprises:

Detecting whether the first signal is low level;

When the first signal is at a low level, the first P-type field effect transistor is turned on and the first N-type field effect transistor is turned off, so that the second internal port of the internal capacitor and the interface module The output terminals are in a disconnected state;

When the first signal is at a high level, the first P-type field effect transistor is turned off and the first N-type field effect transistor is turned on, so that the second internal port of the internal capacitor and the interface module The output terminals are turned on through the first N-type field effect transistor.