WO2023020095A1

WO2023020095A1 - Radio frequency power amplifier circuit, transmission module, communication device, and communication system

Info

Publication number: WO2023020095A1
Application number: PCT/CN2022/099445
Authority: WO
Inventors: 祁威; 龙华
Original assignee: 深圳飞骧科技股份有限公司
Priority date: 2021-08-17
Filing date: 2022-06-17
Publication date: 2023-02-23
Also published as: CN215818097U

Abstract

The present application relates to a radio frequency power amplifier circuit, a transmission module, a communication device, and a communication system. The radio frequency power amplifier circuit comprises: a transformer, wherein a primary side of the transformer comprises a first power amplifier end, a second power amplifier end, and an intermediate tap; the intermediate tap is connected to a power supply; a secondary side of the transformer comprises a power output end and a reference end; a first capacitor module connected across the reference end and the ground, a capacitance variation range of the first capacitor module comprising a first capacitance value and a second capacitance value; and a second capacitor module connected across the power output end and the ground, a capacitance variation range of the second capacitor module comprising a third capacitance value and a fourth capacitance value.

Description

RF power amplifier circuit, transmitter module, communication equipment and communication system

technical field

The application belongs to the field of communication equipment, and in particular relates to a radio frequency power amplifier circuit, a transmitting module, a communication equipment and a communication system.

Background technique

5GNR is the abbreviation of 5G New Radio, which is the hottest research and development focus in today's communication industry. The integration of RF devices in 5G communications is an important development trend, and higher integration modules are the core of 5G RF solutions. The RF front-end module integrates two or more discrete devices such as RF power amplifiers, switches, low-noise amplifiers, filters, and duplexers into one module, thereby improving integration and performance and miniaturizing the volume.

At present, generally speaking, different frequency ranges such as MB: 1.7GHz-2.1GHz, HB: 2.3GHz-2.7GHz require two different complete power amplifier circuits. This occupies a larger area, which is not conducive to integration.

Contents of the invention

Based on this, the present application provides a radio frequency power amplifying circuit, including: a transformer, the primary side of the transformer includes a first power amplifier terminal, a second power amplifier terminal and an intermediate tap, the intermediate tap is connected to a power supply, and the transformer’s The secondary side includes a power output terminal and a reference terminal; the first capacitor module is connected between the reference terminal and the ground, and the capacitance variation range of the first capacitor module includes a first capacitance value and a second capacitance value; The second capacitor module is connected between the power output terminal and the ground, and the capacitance variation range of the second capacitor module includes a third capacitance value and a fourth capacitance value.

Optionally, the first capacitance module may include: a first capacitor, whose capacitance value is the first capacitance value; a second capacitor, whose capacitance value is the second capacitance value; the second capacitance module includes : the third capacitor, the capacitance value of which is the third capacitance value; the fourth capacitor, the capacitance value of which is the fourth capacitance value.

Optionally, the radio frequency power amplification circuit further includes: a first selection switch connected to the first capacitor and the second capacitor; a second selection switch connected to the third capacitor and the fourth capacitor.

Further, the radio frequency power amplification circuit further includes: a first power amplifier connected to the first power amplifier terminal; and a second power amplifier. Connect with the second power amplifier terminal.

Further, when the radio frequency power amplifier circuit works at the first frequency, the capacitance value of the first capacitance module is controlled to be the first capacitance value, and the capacitance value of the second capacitance module is controlled to be the third capacitance value; the circuit works At the second frequency, the capacitance value of the first capacitance module is controlled to be the second capacitance value, and the capacitance value of the second capacitance module is controlled to be the fourth capacitance value.

Further, the first frequency is within the range of 1.7GHz-2.1GHz; the second frequency is within the range of 2.3GHz-2.7GHz.

Further, the radio frequency power amplification circuit is used for 5G communication.

The present application also provides a transmitting module, including any radio frequency power amplifying circuit mentioned above.

The present application also provides a communication device, including any one of the aforementioned radio frequency power amplification circuits, or any one of the aforementioned transmitting modules.

The present application also provides a communication system, including any of the aforementioned radio frequency power amplification circuits, or any of the aforementioned transmitting modules.

Utilize the radio frequency power amplifying circuit, transmitting module, communication equipment and communication system. It can be achieved by connecting a capacitor module with variable capacitance on the secondary coil of the transformer. And when the radio frequency power amplifying circuit works in different frequency ranges, it can control the capacitance of the capacitor module to match the working frequency. This makes the radio frequency power amplifier circuit adaptable to different operating frequencies. Therefore, it is not necessary to configure multiple radio frequency power amplifier circuits for different operating frequencies. Furthermore, the topological structure of the radio frequency power amplifying circuit can be simplified, the volume of the radio frequency power amplifying circuit can be reduced, and the integration degree of the equipment can be improved. The production cost of the radio frequency power amplifier circuit is reduced.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. Those skilled in the art can also obtain other drawings based on these drawings without going beyond the protection scope of the present application.

FIG. 1 shows a schematic diagram of a topology of a radio frequency power amplifier circuit in the prior art.

FIG. 2 shows a schematic diagram of a transmission gain curve of the circuit shown in FIG. 1 when parameters are configured according to MB frequency bands.

FIG. 3 shows a schematic diagram of a transmission gain curve of the circuit shown in FIG. 1 when parameters are configured according to MB frequency bands.

FIG. 4 shows a schematic topology diagram of a radio frequency power amplifier circuit according to an embodiment of the present application.

FIG. 5 shows a schematic diagram of the transmission gain curve of the circuit shown in FIG. 4 .

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of this application.

FIG. 1 shows a schematic diagram of a topology of a radio frequency power amplifier circuit in the prior art. Currently existing radio frequency power amplifier circuits generally include the circuit parts shown in FIG. 1 .

As shown in FIG. 1 , the circuit 1000 includes a transformer TF. The transformer TF includes a primary side and a secondary side. Among them, the primary side is used to access the radio frequency differential signal. The secondary side is used for RF signal output. Capacitors C1 and C3 are generally provided on the secondary side as output frequency selection capacitors. Capacitors C1 and C3 can resonate with TF and jointly determine the operating frequency of the circuit 1000 .

As shown in Figure 2, when configuring the parameters of capacitors C1 and C2 according to the MB frequency band. At the frequency m1 = 1.700 GHz, the gain of the circuit 1000 is -0.912 dB; at the frequency m2 = 2.100 GHz, the gain of the circuit 1000 is -0.959 dB. It can be seen that for signals in the frequency band MB: 1.7GHz-2.1GHz, the circuit 1000 has good transmission characteristics, and its attenuation is small. However, at frequency m3 = 2.300 GHz, the gain of circuit 1000 is -2.124 dB; at frequency m4 = 2.700 GHz, the gain of circuit 1000 is -6.024 GHz. It can be seen that in the frequency band HB: 2.3GHz-2.7GHz, the attenuation of the circuit 1000 is relatively large, which is difficult to meet the requirements.

As shown in Figure 3, when configuring the parameters of capacitors C1 and C2 according to the HB frequency band.

At frequency m3=2.300GHz, the gain of circuit 1000 is -0.669dB; at frequency m4=2.700GHz, the gain of circuit 1000 is -0.799GHz. It can be seen that in the frequency band HB: 2.3GHz-2.7GHz, the attenuation of the circuit 1000 is small, and it has good transmission characteristics. However, at frequency m1 = 1.700 GHz, the gain of circuit 1000 is -2.364 dB; at frequency m2 = 2.100 GHz, the gain of circuit 1000 is -1.051 dB. It can be seen that for signals in the frequency band MB: 1.7GHz-2.1GHz, the circuit 1000 attenuates greatly, which is difficult to meet the requirements.

It can be seen from FIG. 2 and FIG. 3 that it is difficult for the circuit 1000 to take into account the frequency band MB: 1.7GHz-2.1GHz and the frequency band HB: 2.3GHz-2.7GHz at the same time. However, the current communication needs often need to take into account the above two frequency bands. For this reason, the existing design generally adopts two circuits as shown in Fig. 1 to adapt to the above two frequency bands respectively. The above method results in a relatively complex topology of the circuit of the mobile communication device and a large wiring area, which reduces the system integration degree of the communication device.

As shown in FIG. 4 , the circuit 2000 may include a transformer TF and capacitor modules 211 and 212 .

As shown in FIG. 4, the transformer TF may include a primary side and a secondary side. The primary side can be connected to the differential signal of the radio frequency input signal. The secondary side of the transformer TF can be used as the output terminal of the circuit 2000 . The primary winding of the transformer TF includes a terminal PAI1, a terminal PAI2 and an intermediate tap. Wherein, the middle tap can be connected with the power supply VCC. The terminal PAI1 and the terminal PAI2 can be respectively connected to two ends of the radio frequency differential signal. At least one of the two ends PAO1 and PAO2 of the secondary winding can be used as a signal output end. For example, terminal PAO2 can be used as a signal output terminal and connected to an antenna.

As shown in FIG. 4 , the capacitor modules 211 and 212 can be respectively connected to both ends of the secondary winding of the transformer TF. For example, the capacitor module 211 can be connected between the terminal PAO1 of the secondary winding of the transformer and the ground, and the capacitor module 212 can be connected between the terminal PAO2 of the secondary winding of the transformer and the ground.

The capacitor modules 211 and 212 can be used as frequency-selective capacitors of the circuit 2000 , resonate with the transformer TF, and jointly determine the working range of the circuit 2000 . The capacitance values of the capacitor modules 211 and 212 can be changed under control. The variation range of the capacitance value of the capacitance module 211 includes a first capacitance value and a second capacitance value. The variation range of the capacitance value of the capacitance module 212 includes a third capacitance value and a fourth capacitance value.

As shown in FIG. 4 , the capacitor module 211 may include capacitors C1 and C2 . Optionally, the capacitance value of the capacitor C1 may be the first capacitance value, and the capacitance value of the capacitor C2 may be the second capacitance value. Optionally, the capacitor module may include selection switches connected to the capacitor C1 and the capacitor C2 respectively. The purpose of controlling the capacitance value of the capacitance module can be achieved by controlling the selection switch to control the connection of the capacitor C1 and/or the capacitor C2. Optionally, the selection switch may be two switches respectively connected to the capacitor C1 and the capacitor C2, or may be a single-pole double-throw switch Switch1 as shown in the exemplary embodiment.

As shown in FIG. 4 , the capacitor module 212 may include capacitors C3 and C4 . Optionally, the capacitance value of the capacitor C3 may be the third capacitance value, and the capacitance value of the capacitor C4 may be the fourth capacitance value. Optionally, the capacitor module may include selection switches connected to the capacitor C3 and the capacitor C4 respectively. The purpose of controlling the capacitance value of the capacitance module can be achieved by controlling the selection switch to control the connection of the capacitor C3 and/or the capacitor C4. Optionally, the selection switch may be two switches respectively connected to the capacitor C3 and the capacitor C4, or may be a single pole double throw switch Switch2 as shown in the exemplary embodiment.

Optionally, the operating frequency range of the circuit 2000 may include the first frequency and the second frequency. Wherein, when the circuit 2000 works near the first frequency, the capacitance value of the capacitance module 211 can be controlled to be the first capacitance value, and the capacitance value of the capacitance module 212 can be controlled to be the third capacitance value. When the circuit 2000 works near the second frequency, the capacitance value of the capacitance module 211 can be controlled to be the second capacitance value, and the capacitance value of the capacitance module 212 can be controlled to be the fourth capacitance value. Optionally, the first frequency may be within the range of MB: 1.7GHz-2.1GHz; the second frequency may be within the range of HB: 2.3GHz-2.7GHz. Optionally, the circuit 2000 can be used for 5G mobile communication.

Optionally, the circuit 2000 may also include a power amplifier (not shown). Further, the circuit 2000 may include a differential power amplifier. A pair of differential output terminals of the power amplifier can be connected to the terminal PAI1 and the terminal PAI2 respectively. Optionally, the circuit 2000 may also include a differential circuit composed of two or more power amplifiers for differential signal processing. Its output terminals are respectively connected with terminal PAI1 and terminal PAI2.

As shown in FIG. 5 , when the SPDT switches Switch1 and Switch2 are controlled such that the capacitors C1 and C3 are respectively connected to the ground, and the capacitors C2 and C4 are respectively disconnected from the ground. The transmission gain curve of the circuit 2000 may be a thick line in FIG. 5 . This curve may be similar to the curve shown in FIG. 2 . At this time, the circuit 2000 has good transmission characteristics for signals in the frequency band MB: 1.7GHz-2.1GHz.

As shown in FIG. 5 , when the SPDT switches Switch1 and Switch2 are controlled so that the capacitors C1 and C3 are respectively disconnected from the ground, and the capacitors C2 and C4 are respectively connected to the ground. The transmission gain curve of circuit 2000 may be the thin line in FIG. 5 . This curve may be similar to the curve shown in FIG. 3 . At this time, the circuit 2000 has good transmission characteristics for signals in the frequency band HB: 2.3GHz-2.7GHz.

Through the above method, the circuit 2000 can simultaneously take into account the frequency band MB: 1.7GHz-2.1GHz and the frequency band HB: 2.3GHz-2.7GHz. Therefore, the complexity of the circuit topology of the mobile communication device can be reduced, the wiring area can be reduced, and the system integration degree of the communication device can be improved.

The present application also provides an embodiment of a launch module. The transmitting module includes any radio frequency power amplifier circuit mentioned above. Optionally, the transmitting module can be used for 5G mobile communication.

The present application also provides a communication device according to an embodiment. The communication device includes any one of the aforementioned radio frequency power amplification circuits, or any one of the aforementioned transmitting modules. Optionally, the communication device may be a portable mobile communication device. For example, mobile phones, laptops or tablets, and other portable devices that can access mobile communication networks. Optionally, the communication device may be a 5G mobile communication device.

The present application also provides an embodiment communication system. The communication system includes any of the aforementioned radio frequency power amplifier circuits, or any of the aforementioned transmitting modules. The communication system may comprise at least one of the aforementioned communication devices. Optionally, the communication system may communicate using a 5G communication protocol.

The above is a detailed introduction to the embodiments of the present application. In this paper, specific examples are used to illustrate the principles and implementation methods of the present application. The descriptions of the above embodiments are only used to help understand the methods and core ideas of the present application. At the same time, changes or deformations made by those skilled in the art based on the ideas of the application, specific implementation methods and application scopes of the application all belong to the scope of protection of the application. To sum up, the contents of this specification should not be understood as limiting the application.

Claims

A radio frequency power amplifier circuit, characterized in that it comprises:

transformer,

The primary side of the transformer includes a first power amplifier terminal, a second power amplifier terminal and an intermediate tap, the intermediate tap is connected to a power supply,

The secondary side of the transformer includes a power output terminal and a reference terminal;

The first capacitance module is connected between the reference terminal and the ground, and the capacitance variation range of the first capacitance module includes a first capacitance value and a second capacitance value;

The second capacitor module is connected between the power output terminal and the ground, and the capacitance variation range of the second capacitor module includes a third capacitance value and a fourth capacitance value.
The circuit of claim 1, wherein

The first capacitor module includes:

a first capacitor, the capacitance value of which is the first capacitance value;

a second capacitor, the capacitance value of which is the second capacitance value;

The second capacitor module includes:

a third capacitor, the capacitance value of which is the third capacitance value;

The fourth capacitor has a capacitance value of the fourth capacitance value.
The circuit according to claim 2, further comprising:

a first selection switch connected to the first capacitor and the second capacitor;

A second selection switch connected to the third capacitor and the fourth capacitor.
The circuit according to claim 3, further comprising:

a first power amplifier connected to the first power amplifier terminal;

The second power amplifier is connected to the second power amplifier terminal.
The circuit of claim 1, wherein

When the circuit works at the first frequency, the capacitance value of the first capacitance module is controlled to be the first capacitance value, and the capacitance value of the second capacitance module is controlled to be the third capacitance value;

When the circuit works at the second frequency, the capacitance value of the first capacitance module is controlled to be the second capacitance value, and the capacitance value of the second capacitance module is controlled to be the fourth capacitance value.
The circuit of claim 5, wherein

The first frequency is within the range of 1.7GHz-2.1GHz;

The second frequency is within the range of 2.3GHz-2.7GHz.
The circuit according to claim 1, wherein the circuit is used for 5G communication.
A transmitting module, characterized in that it comprises the circuit described in any one of claims 1-7.
A communication device, characterized by comprising the circuit according to any one of claims 1-7, or the transmitting module according to claim 8.
A communication system, characterized by comprising the circuit according to any one of claims 1-7, or the transmitting module according to claim 8.