WO2023273850A1

WO2023273850A1 - Push-pull power amplifier circuit and radio frequency front-end module

Info

Publication number: WO2023273850A1
Application number: PCT/CN2022/098336
Authority: WO
Inventors: 曹原; 戎星桦; 倪建兴
Original assignee: 锐石创芯(深圳)科技股份有限公司
Priority date: 2021-06-30
Filing date: 2022-06-13
Publication date: 2023-01-05
Also published as: CN115622518A

Abstract

The present application discloses a push-pull power amplifier circuit, comprising an input balun, a first bias circuit, a second bias circuit, a first capacitor, a first amplifier, a second amplifier, a first linear feedback circuit, and a second linear feedback circuit. The first linear feedback circuit is provided between the input balun and the first bias circuit, and the second linear feedback circuit is provided between the input balun and the second bias circuit; the use of the first linear feedback circuit and the second linear feedback circuit can improve the linearity of a radio frequency differential amplifier circuit while ensuring the overall performance of the push-pull power amplifier circuit.

Description

A push-pull power amplifier circuit and radio frequency front-end module

This application is based on the Chinese invention application filed on June 30, 2021 with the application number 202110741939.3 and titled "A Push-Pull Power Amplifying System and RF Front-End Module", and claims its priority.

technical field

The present application relates to the technical field of radio frequency circuits, in particular to a push-pull power amplifier circuit and a radio frequency front-end module.

Background technique

Push-pull power amplifier circuits are widely used in communication, broadcasting, radar, industrial processing, medical equipment and scientific research, especially when the RF front-end needs to meet the requirements of higher frequency, larger bandwidth and higher order QAM modulation, the power The amplifying circuit may adopt a push-pull form, for example, in the application of the 5G NR frequency band of the mobile terminal. However, since the amplifying elements in the push-pull power amplifier circuit are non-linear, the push-pull power amplifier circuit cannot achieve ideal linearity; especially the radio frequency signal with a complex modulation method requires more linearity of the push-pull power amplifier circuit. high.

application content

Embodiments of the present application provide a push-pull power amplifying circuit and an antenna device to solve the problem of poor linearity of existing push-pull power amplifying circuits.

A push-pull power amplifier circuit, comprising an input balun, a first bias circuit, a second bias circuit, a first capacitor, a first amplifier, a second amplifier, a first linear feedback circuit and a second linear feedback circuit; The input balun includes a primary coil and a secondary coil, the first end of the secondary coil is connected to the first amplifier, the second end of the secondary coil is connected to the second amplifier; the secondary The primary coil includes a first coil segment and a second coil segment, the first coil segment and the second coil segment are connected through the first capacitor, the first end of the first coil segment is connected to the first capacitor The first end of the first capacitor is connected, the second end of the first capacitor is connected to the first end of the second coil segment, the first bias circuit is coupled to the first end of the first capacitor, and the first bias circuit is coupled to the first end of the first capacitor. a second bias circuit coupled to the second end of the first capacitor;

The first end of the first linear feedback circuit is connected to the input balun, and the second end of the first linear feedback circuit is connected to the first bias circuit;

A first end of the second linear feedback circuit is connected to the input balun, and a second end of the second linear feedback circuit is connected to the second bias circuit.

Further, if the first input terminal of the input balun receives a radio frequency signal input, and the second input terminal is connected to the ground terminal or the power supply terminal, the first terminal of the first linear feedback circuit is configured to be connected to the input balun The first output end of the balun is connected, and the first end of the second linear feedback circuit is configured to be connected to the second output end of the input balun;

Alternatively, if the first input terminal of the input balun receives a radio frequency signal input, and the second input terminal is connected to the ground terminal or the power supply terminal, the first terminal of the first linear feedback circuit is configured to be connected to the input balun connected to the second output terminal of the second linear feedback circuit, and the first terminal of the second linear feedback circuit is configured to be connected to the first output terminal of the input balun.

Further, if the first input end of the input balun receives a first radio frequency signal input, and the second input end receives a second radio frequency input signal, the first end of the first linear feedback circuit is configured to be connected to the input the first output terminal of the balun is connected, and the first terminal of the second linear feedback circuit is configured to be connected to the second output terminal of the input balun;

Or, if the first input end of the input balun receives the first radio frequency signal input, and the second input end receives the second radio frequency input signal, the first end of the first linear feedback circuit is configured to be connected to the input balun The second output end of the balun is connected, and the first end of the second linear feedback circuit is configured to be connected to the first output end of the input balun;

Or, if the first input end of the input balun receives the first radio frequency signal input, and the second input end receives the second radio frequency input signal, the first end of the first linear feedback circuit is configured to be connected to the input balun The first input end of the balun is connected, and the first end of the second linear feedback circuit is configured to be connected to the second input end of the input balun;

Or, if the first input end of the input balun receives the first radio frequency signal input, and the second input end receives the second radio frequency input signal, the first end of the first linear feedback circuit is configured to be connected to the input balun The second input terminal of the input balun is connected, and the first terminal of the second linear feedback circuit is configured to be connected to the first input terminal of the input balun.

Further, the first linear feedback circuit includes a first feedback capacitor, and the second linear feedback circuit includes a second feedback capacitor.

Further, the first linear feedback circuit includes a first feedback resistor and a first feedback capacitor connected in series, and the second linear feedback circuit includes a second feedback resistor and a second feedback capacitor connected in series.

Further, the first bias circuit is coupled to the first end of the first capacitor through a first resistor, and the second bias circuit is coupled to the second end of the first capacitor through a second resistor.

Further, the first bias circuit includes a first bias transistor, the first end of the first bias transistor is connected to the first bias power port, and the second end of the first bias transistor is connected to the first bias power port. A power supply terminal is connected, and the third terminal of the first bias transistor is connected to the first resistor;

The second bias circuit includes a second bias transistor, the first end of the second bias transistor is connected to the second bias power port, and the second end of the second bias transistor is connected to the second power supply port terminals, and the third terminal of the second bias transistor is connected to the second resistor.

Further, the second terminal of the first linear feedback circuit is connected to the third terminal of the first bias transistor; the second terminal of the second linear feedback circuit is connected to the third terminal of the second bias transistor end connected.

Further, the second terminal of the first linear feedback circuit is connected to the first terminal of the first bias transistor; the second terminal of the second linear feedback circuit is connected to the first terminal of the second bias transistor. end connected.

The first terminal of the first linear feedback circuit is connected to the output terminal of the first amplifier, and the second terminal of the first linear feedback circuit is connected to the first bias circuit; the second linear feedback circuit The first end of the second amplifier is connected to the output end of the second amplifier, and the second end of the second linear feedback circuit is connected to the second bias circuit;

Alternatively, the first terminal of the first linear feedback circuit is connected to the output terminal of the second amplifier, and the second terminal of the first linear feedback circuit is connected to the first bias circuit; the second linear feedback circuit A first end of the feedback circuit is connected to the output end of the first amplifier, and a second end of the second linear feedback circuit is connected to the second bias circuit.

Further, the first bias circuit includes a first bias transistor, the first end of the first bias transistor is connected to the first bias power supply port, and the second end of the first bias transistor connected to the first power supply terminal, and the third terminal of the first bias transistor is connected to the first resistor;

A radio frequency front-end module includes the above-mentioned push-pull power amplifier circuit.

The present application provides a push-pull power amplifier circuit, including an input balun, a first bias circuit, a second bias circuit, a first capacitor, a first amplifier, a second amplifier, a first linear feedback circuit and a second linear feedback circuit circuit; the input balun includes a primary coil and a secondary coil, the first end of the secondary coil is connected to the first amplifier, and the second end of the secondary coil is connected to the second amplifier; The secondary coil includes a first coil segment and a second coil segment, the first coil segment and the second coil segment are connected through the first capacitor, the first end of the first coil segment is connected to the The first end of the first capacitor is connected, the second end of the first capacitor is connected to the first end of the second coil segment, the first bias circuit is coupled to the first end of the first capacitor, The second bias circuit is coupled to the second end of the first capacitor; the first end of the first linear feedback circuit is connected to the input balun, and the second end of the first linear feedback circuit is connected to the input balun. The first bias circuit is connected; the first end of the second linear feedback circuit is connected to the input balun, and the second end of the second linear feedback circuit is connected to the second bias circuit; through A first linear feedback circuit is provided between the input balun and the first bias circuit, a second linear feedback circuit is provided between the input balun and the second bias circuit, and the first linear feedback circuit and the second linear feedback circuit are used , thereby improving the linearity of the radio frequency differential amplifier circuit while ensuring the overall performance of the push-pull power amplifier circuit.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments of the present application. Obviously, the accompanying drawings in the following description are only some embodiments of the present application , for those skilled in the art, other drawings can also be obtained according to these drawings without paying creative labor.

Fig. 1 is the schematic diagram of a kind of push-pull power amplifying circuit of the present application;

Fig. 2 is another schematic diagram of a push-pull power amplifier circuit of the present application;

Fig. 3 is another schematic diagram of a push-pull power amplifier circuit of the present application;

Fig. 4 is another schematic diagram of a push-pull power amplifier circuit of the present application;

FIG. 5 is another schematic diagram of a push-pull power amplifier circuit of the present application;

FIG. 6 is another schematic diagram of a push-pull power amplifier circuit of the present application;

FIG. 7 is another schematic diagram of a push-pull power amplifier circuit of the present application;

FIG. 8 is another schematic diagram of a push-pull power amplifier circuit of the present application;

FIG. 9 is another schematic diagram of a push-pull power amplifier circuit of the present application;

FIG. 10 is another schematic diagram of a push-pull power amplifier circuit of the present application;

FIG. 11 is another schematic diagram of a push-pull power amplifier circuit of the present application.

detailed description

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 persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

It should be understood that the present application can be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity, and like reference numerals designate like elements throughout.

It will be understood that when an element or layer is referred to as being "on," "adjacent," "connected to," "connected to," or "coupled to" another element or layer, it can be directly on the other element or layer. An element or layer may be on, adjacent to, connected to, or coupled to another element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly on," "directly adjacent to," "directly connected to" or "directly coupled to" another element or layer, there are no intervening elements or layers present. It will be understood that, although the terms first, second, third etc. may be used to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present application.

Spatial terms such as "below", "under", "beneath", "below", "above", "above", etc., may be used herein for convenience of description The relationship of one element or feature to other elements or features shown in the figures is thus described. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use and operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "below" or "beneath" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary terms "below" and "beneath" can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatial descriptors used herein interpreted accordingly.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the/the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. It should also be understood that the terms "consists of" and/or "comprising", when used in this specification, identify the presence of stated features, integers, steps, operations, elements and/or parts, but do not exclude one or more other Presence or addition of features, integers, steps, operations, elements, parts and/or groups. As used herein, the term "and/or" includes any and all combinations of the associated listed items.

The embodiment of the present application provides a push-pull power amplifier circuit, as shown in Figure 1-Figure 5, the push-pull power amplifier circuit includes an input balun 10, a first bias circuit 40, a second bias circuit 50, a first capacitor C1, the first amplifier M1, the second amplifier M2, the first linear feedback circuit 20 and the second linear feedback circuit 30; the input balun 10 includes a primary coil and a secondary coil, the first end of the secondary coil Connected to the first amplifier M1, the second end of the secondary coil is connected to the second amplifier M2; the secondary coil includes a first coil section and a second coil section, the first coil section and The second coil segment is connected through the first capacitor C1, the first end of the first coil segment is connected to the first end of the first capacitor C1, and the second end of the first capacitor C1 is connected to The first end of the second coil segment, the first bias circuit 40 is coupled to the first end of the first capacitor C1, the second bias circuit 40 is coupled to the first end of the first capacitor C1 Two ends.

Wherein, the input balun 10 includes a first input terminal P11, a second input terminal P12, a first output terminal P13 and a second output terminal P14. In this example, the input balun 10 converts the radio frequency signal received by the first input terminal P11 and/or the second input terminal P12 from an unbalanced radio frequency signal to a balanced radio frequency signal; The terminal P14 sends the balanced radio frequency signal to the first amplifier M1 and the second amplifier M2 respectively; the first amplifier M1 and the second amplifier M2 respectively amplify the balanced radio frequency signals output by the first output terminal P13 and the second output terminal P14 , forming an amplified balanced radio frequency signal; then, transmitting the amplified balanced radio frequency signal to a subsequent stage circuit.

In this embodiment, the input balun 10 includes a primary coil and a secondary coil. The first end of the primary coil is the first input end of the push-pull power amplifying circuit, configured to receive a radio frequency input signal, and the second end is the second input end of the push-pull power amplifying circuit, which is connected to the ground terminal or power terminal connection. The secondary coil includes a first coil segment and a second coil segment. The first coil section and the second coil section are arranged separately, and the first coil section and the second coil section are connected through a first capacitor C1.

In addition, the first coil segment and the second coil segment in the secondary coil may be non-separated, that is, the first coil segment and the second coil segment are essentially a complete coil, and the second coil segment A capacitor C1 is connected to the secondary coil and plays a role of blocking DC in the push-pull power amplifier circuit.

In a specific embodiment, the primary coil of the input balun 10 can be a complete coil, or can be composed of two independent coil segments, that is, the primary coil can be composed of a separate third coil segment and a fourth coil segment, and may also consist of a complete coil.

Referring to FIG. 11 below, it is a schematic structural diagram of the input balun 10 in this embodiment. In this example, it is described by taking that the primary coil includes separate third coils and fourth coils, and the secondary coil includes separate first coils and second coils. The third coil is connected to the fourth coil, and the first coil is connected to the second coil. The third coil is coupled to the first coil; the fourth coil is coupled to the second coil. It can be seen from Figure 10 that, compared with the balun in the prior art, the input balun in this application can improve the winding method of the primary coil/secondary coil while ensuring that the overall performance of the balun remains unchanged. In the case of the balun structure, the occupied space of the balun structure is reduced, and the circuit layout of the balun structure is made more flexible.

Since the secondary coil of the input balun 10 in this application is formed by connecting the first coil segment and the second coil segment, the first capacitor C1 can be connected to the connection between the first coil segment and the second coil segment, There is no need to connect a DC blocking capacitor C11 (not shown in the figure) between the first output terminal of the input balun 10 and the first amplifier M1, and between the second output terminal of the input balun 10 and the second amplifier M2 The DC blocking capacitor C12 (not shown in the figure) is connected between them, that is, the DC blocking capacitor C1 can be realized at the same time by connecting the first coil section of the secondary coil of the input balun and the second coil. The role of C11 and DC blocking capacitor C12. Furthermore, due to the different access positions of capacitor C1, under the same circuit requirements, the capacitance value of C1 is only half that of C11 or C12. Therefore, the space occupied by capacitor C1 after improvement is only four times that of C11 and C12. 1/1, which helps to further reduce the occupied area of the push-pull power amplifier circuit.

In this embodiment, the first bias circuit 40 is coupled to the first terminal of the first capacitor C1, and the second bias circuit 50 is coupled to the second terminal of the first capacitor C1. The first bias circuit 40 provides a bias signal for the first amplifier M1, and the second bias circuit 50 provides a bias signal for the second amplifier M2, so that the static operations of the first amplifier M1 and the second amplifier M2 do not affect each other. In particular, it should be pointed out that since the bias signals provided by the first bias circuit 40 respectively flow through the secondary coil of the input balun and then enter the first amplifier M1, the bias signals provided by the second bias circuit 50 respectively flow The secondary coil of the input balun then enters the second amplifier M2, therefore, the secondary coil of the input balun is equivalent to being multiplexed as an equivalent inductance device, thereby reducing the inductance device at the output end of the bias circuit itself, The number of components of the push-pull power amplifying circuit is further reduced, and the occupied space thereof is reduced, which is beneficial to the miniaturization of the push-pull power amplifying circuit.

Specifically, the first amplifier M1 includes at least one first amplifying transistor, which may be a BJT transistor (for example, an HBT transistor) or a field effect transistor. The second amplifier M2 includes at least one second amplifying transistor, which may be a BJT transistor (eg, an HBT transistor) or a field effect transistor. Optionally, the first amplifier M1 may be a power amplification stage formed by one amplification transistor, or may be a power amplification stage formed by connecting multiple amplification transistors in parallel, or may be formed by cascading multiple amplification transistors Multiple power amplification stages. It can be understood that, in addition to the amplifying transistor, the first amplifier M1 may also include other circuit elements such as a matching network and a bias circuit.

Further, the push-pull power amplifier circuit of the present application further includes an output balun (not shown in the figure). The first input end of the output balun is connected to the output end of the first amplifier M1, and the second input end is connected to the output end of the second amplifier M2; the first output end of the output balun is connected to the signal output end, and the second input end is connected to the output end of the second amplifier M2; The two output terminals are connected to the ground terminal or the power supply terminal. The first amplifier M1 and the second amplifier M2 respectively transmit the amplified balanced double-terminal differential signal to the first input terminal and the second input terminal of the output balun, and the amplified balanced double-terminal differential signal is processed by the output balun Convert to form an amplified unbalanced radio frequency signal and transmit it to the signal output terminal for output.

In this embodiment, the first end of the first linear feedback circuit is connected to the input balun, and the second end of the first linear feedback circuit is connected to the first bias circuit; A first end of the feedback circuit is connected to the input balun, and a second end of the second linear feedback circuit is connected to the second bias circuit.

In a specific embodiment, the first end of the first linear feedback circuit 20 may be connected to the input end or the output end of the input balun, and the second end is connected to the first bias circuit. The first terminal of the second linear feedback circuit 30 may be connected to the input terminal or the output terminal of the input balun, and the second terminal is connected to the second bias circuit. The present application uses the first linear feedback circuit 20 and the second linear feedback circuit 30 to adjust and optimize the input radio frequency signal, thereby reducing the distortion of the radio frequency signal, so as to improve the linearity of the push-pull power amplifier circuit, and then optimize the push-pull The overall performance of the power amplifier circuit.

In one embodiment, as shown in FIG. 1, if the first input terminal of the input balun receives a radio frequency signal input, and the second input terminal is connected to the ground terminal or the power supply terminal, the first terminal of the first linear feedback circuit 20 It is configured to be connected to the first output terminal P13 of the input balun 10 , and the first terminal of the second linear feedback circuit 30 is configured to be connected to the second output terminal P14 of the input balun 10 .

As shown in FIG. 1, if the first input terminal of the input balun receives a radio frequency signal input, and the second input terminal is connected to the ground terminal or the power supply terminal, the first terminal of the first linear feedback circuit 50 is configured to be connected to the input balun. The first output terminal P13 of the balun 10 is connected, and the first terminal of the second linear feedback circuit 60 is configured to be connected to the second output terminal P14 of the input balun 10 . That is, the first linear feedback circuit 50 is arranged between the first output terminal P13 of the input balun 10 and the first bias circuit 40, and is used to ensure that the push-pull power amplifier circuit performs signal amplification processing to achieve ideal linearity . Correspondingly, the second linear feedback circuit 30 is arranged between the second output terminal P14 of the input balun 10 and the second bias circuit 50, so as to improve the radio frequency differential amplification while ensuring the overall performance of the push-pull power amplifier circuit The linearity of the circuit.

In one embodiment, as shown in FIG. 2, if the first input terminal of the input balun receives a radio frequency signal input, and the second input terminal is connected to the ground terminal or the power supply terminal, the first terminal of the first linear feedback circuit 20 It is configured to be connected to the second output terminal P14 of the input balun 10 , and the first terminal of the second linear feedback circuit 30 is configured to be connected to the first output terminal P13 of the input balun 10 .

As shown in FIG. 2, if the first input end of the input balun receives the radio frequency signal input, and the second input end is connected to the ground end or the power end, at this time, the first end of the first linear feedback circuit 20 is configured as It is connected to the second output terminal P14 of the input balun 10 , and the first terminal of the second linear feedback circuit 30 is configured to be connected to the first output terminal P13 of the input balun 10 . Since under non-ideal conditions, there may be a certain degree of phase and power imbalance between the balanced ports (the first output terminal P13 and the second output terminal P14) of the input balun 10, therefore, in this embodiment, the second A linear feedback circuit 20 is arranged between the second output terminal P14 of the input balun 10 and the first bias circuit 40, and the second linear feedback circuit 30 is arranged between the first output terminal P13 of the input balun 10 and the second bias circuit 40. Between the bias circuit 50, thereby further ensuring the balance of the balanced port (first output terminal P13 and second output terminal P14) of the input balun, and ensuring the output of the first output terminal P13 and the second output terminal P14 of the input balun The power of the radio frequency signal is the same; thus, the linearity of the radio frequency differential amplifier circuit can be improved while ensuring the overall performance of the push-pull power amplifier circuit.

Understandably, if the first input terminal of the input balun receives a radio frequency signal input, and the second input terminal is connected to the ground terminal or the power supply terminal, since the two input terminals of the input balun 10 have only one radio frequency signal input, no radio frequency signal is formed. The two radio frequency signals are respectively sent to the first linear feedback circuit 20 and the second linear feedback circuit 30, therefore, the first input terminal of the input balun receives the input radio frequency signal, and the second input terminal is connected to the ground terminal or the power supply terminal , the first terminal of the first linear feedback circuit 20 and the first terminal of the second linear feedback circuit 30 can only be configured to be connected to the first output terminal P13 or the second output terminal P14 of the input balun 10 . Understandably, if the first input terminal of the input balun receives a radio frequency signal input, the second input terminal is connected to the ground terminal or the power supply terminal, and the radio frequency signal received by the input terminal of the input balun 10 is an unbalanced radio frequency signal, That is, the signals received by the first input terminal P11 and the second input terminal P12 of the input balun 10 are different, if the first terminal of the first linear feedback circuit 20 and the first terminal of the second linear feedback circuit 30 are configured to be the same as the input balun The connection between the first input terminal P11 and the second input terminal P12 of the input terminal 10 will cause the push-pull power amplifier circuit to fail to work normally.

In one embodiment, as shown in FIG. 1, if the first input terminal of the input balun receives the first radio frequency signal input, and the second input terminal receives the second radio frequency input signal, the first linear feedback circuit 20 first terminal is configured to be connected to the first output terminal P13 of the input balun 10 , and the first terminal of the second linear feedback circuit 30 is configured to be connected to the second output terminal P14 of the input balun 10 .

As shown in Figure 1, if the first input terminal of the input balun receives the first radio frequency signal input, and the second input terminal receives the second radio frequency input signal, that is, the first input terminal P11 and the second input terminal P11 of the input balun 10 Each terminal P12 receives a radio frequency signal, and there is no input terminal connected to the ground terminal. At this time, the first terminal of the first linear feedback circuit 20 is configured to be connected to the first output terminal P13 of the input balun 10, and the second The first terminal of the bilinear feedback circuit 30 is configured to be connected to the second output terminal P14 of the input balun 10 . That is, the first linear feedback circuit 20 is arranged between the first output terminal P13 of the input balun 10 and the first bias circuit 20, so as to improve the performance of the radio frequency differential amplifier circuit while ensuring the overall performance of the push-pull power amplifier circuit. linearity. Correspondingly, the second linear feedback circuit 30 is arranged between the second output terminal P14 of the input balun 10 and the second bias circuit 50, so as to improve the radio frequency differential amplification while ensuring the overall performance of the push-pull power amplifier circuit The linearity of the circuit.

In one embodiment, as shown in FIG. 2, if the first input terminal of the input balun receives the first radio frequency signal input, and the second input terminal receives the second radio frequency input signal, the first linear feedback circuit 20 first terminal is configured to be connected to the second output terminal P14 of the input balun 10 , and the first terminal of the second linear feedback circuit 30 is configured to be connected to the first output terminal P13 of the input balun 10 .

As shown in Figure 2, if the first input terminal of the input balun receives the first radio frequency signal input, and the second input terminal receives the second radio frequency input signal, that is, the first input terminal P11 and the second input terminal of the input balun 10 Each terminal P12 receives a radio frequency signal, and there is no input terminal connected to the ground terminal. At this time, the first terminal of the first linear feedback circuit 20 is configured to be connected to the second output terminal P14 of the input balun 10, and the second The first terminal of the bilinear feedback circuit 30 is configured to be connected to the first output terminal P13 of the input balun 10 . Since under non-ideal conditions, there may be a certain degree of phase and power imbalance between the balanced ports (the first output terminal P13 and the second output terminal P14) of the input balun 10, therefore, in this embodiment, the second A linear feedback circuit 20 is arranged between the second output terminal P14 of the input balun 10 and the first bias circuit 40, and the second linear feedback circuit 30 is arranged between the first output terminal P13 of the input balun 10 and the second bias circuit 40. Between the bias circuit 50; thus further ensure the balance of the balanced ports (first output terminal P13 and second output terminal P14) of the input balun, and ensure the output of the first output terminal P13 and the second output terminal P14 of the input balun The power of the radio frequency signal is the same; thus, the linearity of the radio frequency differential amplifier circuit can be improved while ensuring the overall performance of the push-pull power amplifier circuit.

In one embodiment, as shown in FIG. 3 , if the first input terminal of the input balun receives the first radio frequency signal input, and the second input terminal receives the second radio frequency input signal, the first linear feedback circuit 20 terminal is configured to be connected to the first input terminal P11 of the input balun 10 , and the first terminal of the second linear feedback circuit 30 is configured to be connected to the second input terminal P12 of the input balun 10 .

As shown in Figure 5, if the first input terminal of the input balun receives the first radio frequency signal input, and the second input terminal receives the second radio frequency input signal, that is, the first input terminal P11 and the second input terminal P11 of the input balun 10 Each terminal P12 receives a radio frequency signal, and there is no input terminal connected to the ground terminal. At this time, the first terminal of the first linear feedback circuit 20 is configured to be connected to the first input terminal P11 of the input balun 10, and the second The first terminal of the bilinear feedback circuit 30 is configured to be connected to the second input terminal P12 of the input balun 10 . That is, the first linear feedback circuit 20 is arranged between the first input terminal P11 of the input balun 10 and the first bias circuit 40, so as to improve the performance of the radio frequency differential amplifier circuit while ensuring the overall performance of the push-pull power amplifier circuit. Linearity; Correspondingly, the second linear feedback circuit 30 is arranged between the second input terminal P12 of the input balun 10 and the second bias circuit 50, so as to improve the overall performance of the push-pull power amplifier circuit while ensuring the overall performance of the push-pull power amplifier circuit Linearity of RF differential amplifier circuits.

In one embodiment, as shown in FIG. 4, if the first input terminal of the input balun receives the first radio frequency signal input, and the second input terminal receives the second radio frequency input signal, the first linear feedback circuit 20 first terminal is configured to be connected to the second input terminal P12 of the input balun 10 , and the first terminal of the second linear feedback circuit 30 is configured to be connected to the first input terminal P11 of the input balun 10 .

As shown in Figure 4, if the first input terminal of the input balun receives the first radio frequency signal input, the second input terminal receives the second radio frequency input signal, that is, the first input terminal P11 and the second input terminal P11 of the input balun 10 Each terminal P12 receives a radio frequency signal, and there is no input terminal connected to the ground terminal. At this time, the first terminal of the first linear feedback circuit 20 is configured to be connected to the second input terminal P12 of the input balun 10, and the second The first terminal of the bilinear feedback circuit 30 is configured to be connected to the first input terminal P11 of the input balun 10 . Since under non-ideal conditions, there may be a certain degree of phase and power imbalance between the first input terminal P11 and the second input terminal P12 of the input balun 10, therefore, in this embodiment, the first linear feedback circuit can be 20 is arranged between the second input terminal P12 of the input balun 10 and the first bias circuit 40, and the second linear feedback circuit 30 is arranged between the first input terminal P11 of the input balun 10 and the second bias circuit 50 between; thereby further ensuring the balance of the first input terminal P11 and the second input terminal P12 of the input balun, and ensuring that the power of the radio frequency signal input to the first input terminal P11 and the second input terminal P12 of the balun is the same; thus The linearity of the radio frequency differential amplifier circuit is improved while ensuring the overall performance of the push-pull power amplifier circuit.

Understandably, if the first input terminal of the input balun receives the first radio frequency signal input, and the second input terminal receives the second radio frequency input signal, since each of the two input terminals of the input balun 10 has a radio frequency signal input, Can be sent to the first linear feedback circuit 20 and the second linear feedback circuit 30 respectively, therefore, when the input balun 10 is a double-ended RF signal input, the first end of the first linear feedback circuit 20 and the second linear feedback circuit 30 The first terminal of the input balun 10 can not only be configured to be connected to the first output terminal P13 or the second output terminal P14 of the input balun 10, but also can be configured to be connected to the first input terminal P11 or the second input terminal P12 of the input balun 10 connected. Understandably, when the input balun 10 is a double-ended RF signal input, the signals received by the first input terminal P11 and the second input terminal P12 of the input balun 10 are the same, and the signals received by the first output terminal P13 or the second input terminal P12 of the input balun 10 are The signals output by the two output terminals P14 are the same, therefore, the first terminal of the first linear feedback circuit 20 and the first terminal of the second linear feedback circuit 30 can be configured to be connected to the two input terminals of the input balun at the same time, or At the same time, it is connected to the two output terminals to ensure that the radio frequency differential amplifier circuit can work normally.

In one embodiment, as shown in FIG. 8, the first linear feedback circuit 20 includes a first feedback capacitor C2, one end of the first feedback capacitor C2 is connected to the input balun 10, and the other end is connected to the first bias circuit 30; The second linear feedback circuit 30 includes a second feedback capacitor C3 , one end of the second feedback capacitor C3 is connected to the input balun 10 , and the other end is connected to the second bias circuit 40 .

In this example, both the first feedback capacitor C2 and the second feedback capacitor C3 can function to isolate DC current, that is, both the first feedback capacitor C2 and the second feedback capacitor C3 have a blocking effect on DC current, and their capacitance varies with radio frequency The frequency of the signal changes; during the signal amplification process of the first amplifier M1 and the second amplifier M2, based on the functions of the first feedback capacitor C2 and the second feedback capacitor C3, the linearity of the push-pull power amplifier circuit is improved. Understandably, the connection manners of the first feedback capacitor C2 and the second feedback capacitor C3 to the input balun 10 may refer to the examples shown in FIGS. 1-4 .

In one embodiment, as shown in FIG. 9, the first linear feedback circuit 20 includes a first feedback resistor R3 and a first feedback capacitor C2 connected in series, the first feedback resistor R3 is connected to the input balun 10, and the first feedback capacitor C3 is connected to the first bias circuit 40; the second linear feedback circuit 30 includes a second feedback resistor R4 and a second feedback capacitor C3 connected in series, the second feedback resistor R4 is connected to the input balun 10, and the second feedback capacitor C3 is connected to the input balun 10. The second bias circuit 50 is connected.

In this example, the first feedback resistor R3 and the first feedback capacitor C2 are connected in series, and the total impedance of the first linear feedback circuit 20 formed by it is determined by the impedance of the first feedback resistor R3 and the capacitive reactance of the first feedback capacitor C2, The total impedance of the first linear feedback circuit 20 also varies with the frequency of the radio frequency signal. Understandably, during the signal amplification process of the first amplifier M1, the linearity of the push-pull power amplifier circuit is improved with the cooperation of the first feedback resistor R3 and the second feedback capacitor C2.

Correspondingly, the second feedback resistor R4 and the second feedback capacitor C3 are connected in series, and the total impedance of the second linear feedback circuit 30 formed by it is determined by the impedance of the second feedback resistor R4 and the capacitive reactance of the second feedback capacitor C3. The total impedance of the bilinear feedback circuit 30 also varies with the frequency of the RF signal. Understandably, during the signal amplification process of the second amplifier M2, the linearity of the push-pull power amplifying circuit is improved with the cooperation of the second feedback resistor R4 and the second feedback capacitor C3.

Preferably, as shown in FIG. 5, the first bias circuit 40 is coupled to the first terminal of the first capacitor C1 through a first resistor R1, and the second bias circuit 50 is coupled to the first terminal of the first capacitor C1 through a second resistor R2. The second terminal of the first capacitor C1.

In a specific embodiment, when the first bias circuit 40 is coupled to the first coil segment of the secondary coil of the input balun 10, the second bias circuit 50 is coupled to the second coil of the secondary coil of the input balun 10 During the period, by flexibly adjusting the resistance values of the first resistor R1 and the second resistor R2, the first bias circuit 40 can provide a suitable bias signal for the first amplifier M1, and the second bias circuit 50 is the second amplifier M2 An appropriate bias signal is provided so that the first amplifier M1 and the second amplifier M2 are at an appropriate working static point; thereby improving the overall circuit robustness of the push-pull power amplifier circuit.

It should be noted that the first bias circuit 40 in this application is coupled to the first end of the capacitor through the first resistor R1, and the second bias circuit 50 is coupled to the second end of the capacitor through the second resistor R2. It is only one of the preferred implementation manners, and the first bias circuit 40 and the second bias circuit 50 may also be coupled to the first end and the second end of the capacitor by any other means. For example: the first bias circuit 40 can also be coupled to the first end of the capacitor through the first LC parallel circuit and the second bias circuit 5 is coupled to the second end of the capacitor through the second LC parallel circuit, where No examples are given.

In a specific embodiment, the first bias circuit includes a first bias transistor K1, the first end of the first bias transistor is connected to the first bias power supply port, and the first bias transistor K1 The second terminal is connected to the first power supply terminal, and the third terminal of the first bias transistor K1 is connected to the first resistor. Wherein, the first bias power supply port is a port for receiving a first bias signal source.

The second bias circuit includes a second bias transistor K2, the first end of the second bias transistor K2 is connected to the second bias power port, and the second end of the second bias transistor K2 is connected to the second bias power port. The two power supply terminals are connected, and the third terminal of the second bias transistor K2 is connected to the second resistor. Wherein, the second bias power supply port is a port for receiving a second bias signal source.

Specifically, as shown in FIG. 8 and FIG. 9, the first bias circuit 40 further includes a first bias power supply terminal S and a first voltage dividing unit 41, and the first bias power supply terminal S1 is connected to the first bias power supply terminal S1. The first terminal of a bias transistor K1 is connected to and, the first bias power supply terminal S1 is connected to the ground terminal through the first voltage dividing unit 41, and the second terminal of the first bias transistor K1 is connected to the first The power supply terminals are connected, and the third terminal of the first bias transistor K1 is connected to the first resistor R1.

The second bias circuit 50 further includes a second bias power supply terminal S2 and a second voltage dividing unit 51, the second bias power supply terminal S2 is connected to the first terminal of the second bias transistor K2, so The second bias power supply terminal S2 is connected to the ground terminal through the second voltage dividing unit 51, the second terminal of the second bias transistor K2 is connected to the power supply terminal, and the second terminal of the second bias transistor K2 The three terminals are connected to the second resistor R2.

Optionally, the first bias power supply terminal S1 is configured to receive a bias signal source from the first bias power supply, and provide the bias signal source to the first bias transistor K1. Wherein, the first bias power supply may be a bias current source or a bias voltage source. When it is a bias current source, the bias signal source provided for the first bias transistor K1 is a bias current; when it is a bias voltage source, the bias signal source provided for the first bias transistor K1 is a bias Voltage. The first bias transistor K1 can be selected as a bipolar transistor (BJT) and a field effect transistor (FET). When the first bias transistor K1 is a bipolar transistor (BJT), the first bias power supply terminal S1 is connected to the base of the first bias transistor K1, and is configured to provide a bias signal source to the first bias transistor K1 The base of the first bias transistor K1 and the emitter of the first bias transistor K1 are connected to the first resistor R1, so as to respectively provide bias signals for the first amplifier M1. When the first bias transistor K1 is a field effect transistor (FET), the first bias power supply terminal S1 is connected to the gate of the first bias transistor K1, and is configured to provide a bias signal source to the first bias transistor K1. The gate is biased to the source of the first bias transistor K1 and connected to the first resistor R1 so as to provide a bias signal for the first amplifier M1.

Further, the first bias circuit 40 also includes a first voltage dividing unit 41 arranged between the first bias power supply terminal S1 and the ground terminal, the first bias power supply terminal S1 and the first voltage dividing unit 41 The connecting node between them is connected to the first terminal of the first bias transistor K1. The first voltage dividing unit 41 includes a first voltage dividing transistor and a second voltage dividing transistor connected in series, the first end of the first voltage dividing transistor is connected to the first bias power supply terminal S1, and the second end is connected to the second voltage dividing transistor. The first end is connected, and the second end of the second voltage dividing transistor is connected to the ground end. The first voltage dividing unit 41 can stabilize the static working point of the bias signal. It should be noted that, except in this embodiment, the first voltage dividing transistor and the second voltage dividing transistor can be selected from diodes, and can also be replaced by triodes.

Likewise, the second bias power supply terminal S1 is configured to receive a bias signal source from the second bias power supply, and provide the bias signal source to the second bias transistor K2. Wherein, the second bias power supply may be a bias current source or a bias voltage source. When it is a bias current source, the bias signal source provided for the second bias transistor K2 is a bias current, and when it is a bias voltage source, the bias signal source provided for the second bias transistor K2 is a bias Voltage. The second bias transistor K2 can be selected as a bipolar transistor (BJT) and a field effect transistor (FET). When the first bias transistor K2 is a bipolar transistor (BJT), the second bias power supply terminal S2 is connected to the base of the first thermal bias transistor K2, and is configured to provide a bias signal source to the second bias transistor K2 The base of the second bias transistor K2 is connected to the second resistor R2 to provide bias signals for the second amplifier M2 respectively. When the second bias transistor K2 is a field effect transistor (FET), the second bias power supply terminal S2 is connected to the gate of the second bias transistor K2, and is configured to provide a bias signal source to the second bias transistor K2 The gate is biased and the source of the second bias transistor K2 is connected to the second resistor R2, so as to provide a bias signal for the second amplifier M2.

Further, the second bias circuit 50 also includes a second voltage dividing unit 51 arranged between the second bias power supply terminal S2 and the ground terminal, the second bias power supply terminal S2 and the second voltage dividing unit 51 The connection node between is connected to the first terminal of the second bias transistor K2. The second voltage dividing unit 42 includes a third voltage dividing transistor and a fourth voltage dividing transistor connected in series, the first end of the third voltage dividing transistor is connected to the second bias power supply terminal S2, and the second end is connected to the fourth voltage dividing transistor. The first end is connected, and the second end of the fourth voltage dividing transistor is connected to the ground end. The second voltage dividing unit 51 can stabilize the static operating point of the bias signal. It should be noted that, except in this embodiment, the third voltage dividing transistor and the fourth voltage dividing transistor can be selected from diodes, and can also be replaced by triodes.

It should be noted that the first bias power supply that provides the bias signal source for the first bias circuit 40 and the second bias power supply that provides the bias signal source for the second bias circuit 50 may be the same bias power supply, Also available for different bias supplies. That is, the first bias transistor K1 in the first bias circuit 40 and the second bias transistor K2 in the second bias circuit 50 can be connected to one bias power supply through the same bias power supply terminal, or can be connected to each other through two bias power supply terminals. A different bias power supply terminal is connected to two different bias power supplies. The first bias power supply and the second bias power supply may use constant current sources for providing a constant current as an input current to ensure the stability of the output first bias current and the second bias current.

In a specific embodiment, as shown in FIG. 8 and FIG. 9 below, the second terminal of the first linear feedback circuit 20 is connected to the third terminal of the first bias transistor K1; the second linear feedback circuit The second terminal of the circuit 30 is connected to the third terminal of the second bias transistor K2. The present application uses the first linear feedback circuit 20 and the second linear feedback circuit 30 to connect the first end of the first linear feedback circuit 20 to the input balun 10, and the second end to the first bias circuit 40 in the first The third end of the bias transistor K1 is connected, the first end of the second linear feedback circuit 20 is connected to the input balun 10, and the second end is connected to the third end of the second bias transistor K2 in the second bias circuit 50 The input radio frequency signal is adjusted and optimized through the first bias signal output from the first bias circuit 40 to the first amplifier M1 and the second bias signal output from the second bias circuit 50 to the second amplifier M2, Therefore, the distortion of the radio frequency signal is reduced, so as to improve the linearity of the push-pull power amplifier circuit, and further optimize the overall performance of the push-pull power amplifier circuit.

In a specific embodiment, as shown in FIG. 10 below, the second terminal of the first linear feedback circuit is connected to the first terminal of the first bias transistor; the second terminal of the second linear feedback circuit connected to the first terminal of the second bias transistor. The present application uses the first linear feedback circuit 20 and the second linear feedback circuit 30 to connect the first end of the first linear feedback circuit 20 to the input balun 10, and the second end to the first bias circuit 40 in the first The first end of the bias transistor K1 is connected, the first end of the second linear feedback circuit 20 is connected to the input balun 10, and the second end is connected to the first end of the second bias transistor K2 in the second bias circuit 50 connected, through the bias signal source provided by the first bias power supply terminal in the first bias circuit 40 and the bias signal source provided by the second bias power supply terminal in the second bias circuit 40 to carry out the input radio frequency signal Adjust and optimize, thereby reducing the distortion of the radio frequency signal, so as to improve the linearity of the push-pull power amplifier circuit, and then optimize the overall performance of the push-pull power amplifier circuit.

In this example, the first bias circuit 40 provides a first bias signal to the first amplifier M1 so as to ensure that the first amplifier M1 can amplify the signal without distortion. Specifically, the first bias signal output by the first bias circuit 40 is coupled to the first end of the first amplifier M1 through the first coupling resistor R1, and the first DC blocking capacitor C1 functions to isolate the DC current, so that The first terminal, the second terminal and the third terminal of the first amplifier M1 are at their required potentials, so that the emitter junction of the first amplifier M1 is forward-biased and the collector junction is reverse-biased, thereby ensuring that the first amplifier M1 can transmit The signal is amplified.

The second bias circuit 50 provides a second bias signal to the second amplifier M2 so as to ensure that the second amplifier M2 can amplify the signal without distortion. Specifically, the second bias signal output by the second bias circuit 50 is coupled to the first end of the second amplifier M2 through the second coupling resistor R2, and the first DC blocking capacitor C1 functions to isolate the DC current, so that The first terminal, the second terminal and the third terminal of the second amplifier M2 are at their required potentials, so that the emitter junction of the second amplifier M2 is forward-biased and the collector junction is reverse-biased, thereby ensuring that the second amplifier M2 can transmit The signal is amplified.

The embodiment of the present application provides a push-pull power amplifier circuit, as shown in Fig. 6-Fig. 7, including input balun 10, first bias circuit 40, second bias circuit 50, first capacitor C1, first amplifier M1, the second amplifier M2, the first linear feedback circuit 20 and the second linear feedback circuit 30; the input balun 10 includes a primary coil and a secondary coil, the first end of the secondary coil is connected to the first An amplifier M1, the second end of the secondary coil is connected to the second amplifier M2; the secondary coil includes a first coil segment and a second coil segment, the first coil segment and the second coil segments are connected through the first capacitor C1, the first end of the first coil segment is connected to the first end of the first capacitor C1, and the second end of the first capacitor is connected to the second coil segment The first bias circuit 40 is coupled to the first terminal of the first capacitor C1, and the second bias circuit 50 is coupled to the second terminal of the first capacitor C1.

The first end of the first linear feedback circuit 20 is connected to the output end of the first amplifier M1, and the second end of the first linear feedback circuit 20 is connected to the first bias circuit 40; The first end of the two-linear feedback circuit 30 is connected to the output end of the second amplifier M2, and the second end of the second linear feedback circuit 30 is connected to the second bias circuit 50; or, the first The first end of the linear feedback circuit 20 is connected to the output end of the second amplifier M2, and the second end of the first linear feedback circuit 20 is connected to the first bias circuit 40; the second linear feedback circuit The first end of 30 is connected to the output end of the first amplifier M1 , and the second end of the second linear feedback circuit 30 is connected to the second bias circuit 50 . The present application uses the first linear feedback circuit 20 and the second linear feedback circuit 30 to adjust and optimize the output radio frequency signal, thereby reducing the distortion of the radio frequency signal, so as to improve the linearity of the push-pull power amplifier circuit, and then optimize the push-pull The overall performance of the power amplifier circuit.

In a specific embodiment, the first linear feedback circuit includes a first feedback capacitor C2 , one end of the first feedback capacitor C2 is connected to the output end of the first amplifier M1 , and the other end is connected to the first bias circuit 30 . The second linear feedback circuit includes a second feedback capacitor; one end of the second feedback capacitor C3 is connected to the output end of the second amplifier M2 , and the other end is connected to the second bias circuit 40 . Alternatively, one end of the first feedback capacitor C2 is connected to the output end of the second amplifier M2, the other end is connected to the first bias circuit 30, one end of the second feedback capacitor C3 is connected to the output end of the first amplifier M1, and the other end is connected to the output end of the first amplifier M1. The second bias circuit 40 is connected.

In this example, both the first feedback capacitor C2 and the second feedback capacitor C3 can play the role of isolating DC current, that is, both the first feedback capacitor C2 and the second feedback capacitor C3 have a blocking effect on DC current, and their capacitive reactance varies with radio frequency The frequency of the signal changes; during the signal amplification process of the first amplifier M1 and the second amplifier M2, based on the functions of the first feedback capacitor C2 and the second feedback capacitor C3, the linearity of the push-pull power amplifier circuit is improved. Understandably, the connection manners of the first feedback capacitor C2 and the second feedback capacitor C3 to the first amplifier M1 and the second amplifier M2 may refer to the examples shown in FIGS. 6-7 .

In a specific embodiment, the first linear feedback circuit includes a first feedback resistor and a first feedback capacitor connected in series, and the second linear feedback circuit includes a second feedback resistor and a second feedback capacitor connected in series.

In one embodiment, the first linear feedback circuit 20 includes a first feedback resistor R3 and a first feedback capacitor C2 connected in series, the first feedback resistor R3 is connected to the output terminal of the first amplifier M1, and the first feedback capacitor C3 is connected to the first The bias circuit 40 is connected; the second linear feedback circuit 30 includes a second feedback resistor R4 and a second feedback capacitor C3 connected in series, the second feedback resistor R4 is connected to the output terminal of the second amplifier M2, and the second feedback capacitor C3 is connected to the second A bias circuit 50 is connected.

In this example, the first feedback resistor R3 and the first feedback capacitor C2 are connected in series, and the total impedance of the first linear feedback circuit 20 formed by it is determined by the impedance of the first feedback resistor R3 and the capacitive reactance of the first feedback capacitor C2. The total impedance of a linear feedback circuit 20 also varies with the frequency of the RF signal. Understandably, during the signal amplification process of the first amplifier M1, the linearity of the push-pull power amplifier circuit is improved with the cooperation of the first feedback resistor R3 and the second feedback capacitor C2.

Correspondingly, the second feedback resistor R4 and the second feedback capacitor C3 are connected in series, and the total impedance of the second linear feedback circuit 30 formed by it is determined by the impedance of the second feedback resistor R4 and the capacitance of the second feedback capacitor C3, the second The overall impedance of the linear feedback circuit 30 also varies with the frequency of the RF signal. Understandably, during the signal amplification process of the second amplifier M2, the linearity of the push-pull power amplifying circuit is improved with the cooperation of the second feedback resistor R4 and the second feedback capacitor C3.

In a specific embodiment, the first bias circuit is coupled to the first terminal of the first capacitor through a first resistor, and the second bias circuit is coupled to the first terminal of the first capacitor through a second resistor. Two ends.

It should be noted that the first bias circuit 40 in this application is coupled to the first end of the capacitor through the first resistor R1, and the second bias circuit 50 is coupled to the second end of the capacitor through the second resistor R2. It is only one of the preferred implementation manners, and the first bias circuit 40 and the second bias circuit 50 may also be coupled to the first terminal and the second terminal of the capacitor in any other manner. For example: the first bias circuit 40 can also be coupled to the first end of the capacitor through the first LC parallel circuit and the second bias circuit 5 is coupled to the second end of the capacitor through the second LC parallel circuit, where No examples are given.

In one embodiment, the first bias circuit further includes a first bias power supply terminal and a first voltage dividing unit, the first bias power supply terminal is connected to the first terminal of the first bias transistor and The first bias power terminal is connected to the ground terminal through the first voltage dividing unit, the second terminal of the first bias transistor is connected to the power supply terminal, and the third terminal of the first bias transistor The terminal is connected to the first resistor;

The second bias circuit further includes a second bias power supply terminal and a second voltage dividing unit, the second bias power supply terminal is connected to the first terminal of the second bias transistor, and the second bias power supply terminal is connected to the first terminal of the second bias transistor. The power supply terminal is connected to the ground terminal through the second voltage dividing unit, the second terminal of the second bias transistor is connected to the power supply terminal, and the third terminal of the second bias transistor is connected to the second resistor .

Specifically, as shown in FIG. 8 and FIG. 9, the first bias circuit 40 includes a first bias power supply terminal S1, a first bias transistor K1 and a first voltage dividing unit 41, and the first bias power supply Terminal S1 is connected to the first terminal and of the first bias transistor K1, the first bias power supply terminal S1 is connected to the ground terminal through the first voltage dividing unit 41, and the terminal of the first bias transistor K1 The second terminal is connected to the power supply terminal, and the third terminal of the first bias transistor K1 is connected to the first resistor R1.

The second bias circuit 50 includes a second bias power supply terminal S2, a second bias transistor K2 and a second voltage dividing unit 51, the second bias power supply terminal S2 and the second bias transistor K2 The first terminal is connected, the second bias power supply terminal S2 is connected to the ground terminal through the second voltage dividing unit 51, the second terminal of the second bias transistor K2 is connected to the power supply terminal, and the second bias power supply terminal S2 is connected to the ground terminal. The third end of the bias transistor K2 is connected to the second resistor R2.

Further, the first bias circuit 40 also includes a first voltage dividing unit 41 arranged between the first bias power supply terminal S1 and the ground terminal, the first bias power supply terminal S1 and the first voltage dividing unit 41 The connecting node between them is connected to the first terminal of the first bias transistor K1. The first voltage dividing unit 41 includes a first voltage dividing transistor and a second voltage dividing transistor connected in series, the first end of the first voltage dividing transistor is connected to the first bias power supply terminal S1, and the second end is connected to the second voltage dividing transistor. The first end is connected, and the second end of the second voltage dividing transistor is connected to the ground end. The first voltage dividing unit 41 can stabilize the static operating point of the bias signal. It should be noted that, except in this embodiment, the first voltage dividing transistor and the second voltage dividing transistor can be selected from diodes, and can also be replaced by triodes.

Further, the second bias circuit 50 also includes a second voltage dividing unit 51 arranged between the second bias power supply terminal S2 and the ground terminal, the second bias power supply terminal S2 and the second voltage dividing unit 51 The connection node between is connected to the first end of the second bias transistor K2. The second voltage dividing unit 42 includes a third voltage dividing transistor and a fourth voltage dividing transistor connected in series, the first end of the third voltage dividing transistor is connected to the second bias power supply terminal S2, and the second end is connected to the fourth voltage dividing transistor. The first end is connected, and the second end of the fourth voltage dividing transistor is connected to the ground end. The second voltage dividing unit 51 can stabilize the static operating point of the bias signal. It should be noted that, except in this embodiment, the third voltage dividing transistor and the fourth voltage dividing transistor can be selected from diodes, and can also be replaced by triodes.

This embodiment also provides a radio frequency front-end module, including the above-mentioned push-pull power amplifier circuit, by using the first linear feedback circuit and the second linear feedback circuit, so as to ensure the overall performance of the push-pull power amplifier circuit, thereby Improve the linearity of the RF differential amplifier circuit.

It should be understood that the sequence numbers of the steps in the above embodiments do not mean the order of execution, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiment of the present application.

Those skilled in the art can clearly understand that for the convenience and brevity of description, only the division of the above-mentioned functional units and modules is used for illustration. In practical applications, the above-mentioned functions can be assigned to different functional units, Completion of modules means that the internal structure of the device is divided into different functional units or modules to complete all or part of the functions described above.

The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still implement the foregoing Modifications to the technical solutions described in the examples, or equivalent replacement of some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the application, and should be included in the Within the protection scope of this application.

Claims

A push-pull power amplifier circuit, including an input balun, a first bias circuit, a second bias circuit, a first capacitor, a first amplifier, a second amplifier, a first linear feedback circuit and a second linear feedback circuit ; the input balun includes a primary coil and a secondary coil, the first end of the secondary coil is connected to the first amplifier, and the second end of the secondary coil is connected to the second amplifier; The secondary coil includes a first coil segment and a second coil segment, the first coil segment and the second coil segment are connected through the first capacitor, the first end of the first coil segment is connected to the first coil segment The first end of a capacitor is connected, the second end of the first capacitor is connected to the first end of the second coil segment, and the first bias circuit is coupled to the first end of the first capacitor, so The second bias circuit is coupled to the second terminal of the first capacitor;

The first end of the first linear feedback circuit is connected to the input balun, and the second end of the first linear feedback circuit is connected to the first bias circuit;

A first end of the second linear feedback circuit is connected to the input balun, and a second end of the second linear feedback circuit is connected to the second bias circuit.
The push-pull power amplifying circuit according to claim 1, wherein if the first input terminal of the input balun receives a radio frequency signal input, and the second input terminal is connected to a ground terminal or a power supply terminal, the first linear feedback circuit The first end of the input balun is connected to the first output end of the input balun, and the first end of the second linear feedback circuit is connected to the second output end of the input balun;

Or, if the first input terminal of the input balun receives the input of the radio frequency signal, the second input terminal is connected to the ground terminal or the power supply terminal, and the first terminal of the first linear feedback circuit is connected to the second terminal of the input balun. The output terminals are connected, and the first terminal of the second linear feedback circuit is connected with the first output terminal of the input balun.
The push-pull power amplifier circuit according to claim 1, wherein if the first input terminal of the input balun receives the first radio frequency signal input, and the second input terminal receives the second radio frequency input signal, the first linear feedback The first end of the circuit is connected to the first output end of the input balun, and the first end of the second linear feedback circuit is connected to the second output end of the input balun;

Or, if the first input terminal of the input balun receives the first radio frequency signal input, and the second input terminal receives the second radio frequency input signal, the first terminal of the first linear feedback circuit and the first terminal of the input balun The two output terminals are connected, and the first terminal of the second linear feedback circuit is connected to the first output terminal of the input balun;

Or, if the first input terminal of the input balun receives the first radio frequency signal input, and the second input terminal receives the second radio frequency input signal, the first terminal of the first linear feedback circuit and the first terminal of the input balun An input terminal is connected, and the first terminal of the second linear feedback circuit is connected to the second input terminal of the input balun;

Or, if the first input terminal of the input balun receives the first radio frequency signal input, and the second input terminal receives the second radio frequency input signal, the first terminal of the first linear feedback circuit and the first terminal of the input balun The two input terminals are connected, and the first terminal of the second linear feedback circuit is connected to the first input terminal of the input balun.
The push-pull power amplifier circuit according to claim 1, wherein the first linear feedback circuit includes a first feedback capacitor, and the second linear feedback circuit includes a second feedback capacitor.
The push-pull power amplifier circuit according to claim 1, wherein the first linear feedback circuit comprises a first feedback resistor and a first feedback capacitor connected in series, and the second linear feedback circuit comprises a second feedback circuit connected in series resistor and a second feedback capacitor.
The push-pull power amplifying circuit according to claim 1, wherein the first bias circuit is coupled to the first end of the first capacitor through a first resistor, and the second bias circuit is coupled through a second resistor to the second terminal of the first capacitor.
The push-pull power amplifier circuit according to claim 6, wherein the first bias circuit comprises a first bias transistor, the first end of the first bias transistor is connected to the first bias power supply port, so The second terminal of the first bias transistor is connected to the first power supply terminal, and the third terminal of the first bias transistor is connected to the first resistor;

The second bias circuit includes a second bias transistor, the first end of the second bias transistor is connected to the second bias power port, and the second end of the second bias transistor is connected to the second power supply port terminals, and the third terminal of the second bias transistor is connected to the second resistor.
The push-pull power amplifier circuit according to claim 7, wherein, the second end of the first linear feedback circuit is connected to the third end of the first bias transistor; the second end of the second linear feedback circuit The terminal is connected to the third terminal of the second bias transistor.
The push-pull power amplifier circuit according to claim 7, wherein, the second end of the first linear feedback circuit is connected to the first end of the first bias transistor; the second end of the second linear feedback circuit The terminal is connected to the first terminal of the second bias transistor.
A push-pull power amplifier circuit, including an input balun, a first bias circuit, a second bias circuit, a first capacitor, a first amplifier, a second amplifier, a first linear feedback circuit and a second linear feedback circuit ; the input balun includes a primary coil and a secondary coil, the first end of the secondary coil is connected to the first amplifier, and the second end of the secondary coil is connected to the second amplifier; The secondary coil includes a first coil segment and a second coil segment, the first coil segment and the second coil segment are connected through the first capacitor, the first end of the first coil segment is connected to the first coil segment The first end of a capacitor is connected, the second end of the first capacitor is connected to the first end of the second coil segment, and the first bias circuit is coupled to the first end of the first capacitor, so The second bias circuit is coupled to the second terminal of the first capacitor;

The first terminal of the first linear feedback circuit is connected to the output terminal of the first amplifier, and the second terminal of the first linear feedback circuit is connected to the first bias circuit; the second linear feedback circuit The first terminal of the second amplifier is connected to the output terminal of the second amplifier, and the second terminal of the second linear feedback circuit is connected to the second bias circuit;

Alternatively, the first terminal of the first linear feedback circuit is connected to the output terminal of the second amplifier, and the second terminal of the first linear feedback circuit is connected to the first bias circuit; the second linear feedback circuit A first end of the feedback circuit is connected to the output end of the first amplifier, and a second end of the second linear feedback circuit is connected to the second bias circuit.
The push-pull power amplifier circuit according to claim 10, wherein the first linear feedback circuit includes a first feedback capacitor, and the second linear feedback circuit includes a second feedback capacitor.
The push-pull power amplifier circuit according to claim 10, wherein the first linear feedback circuit comprises a first feedback resistor and a first feedback capacitor connected in series, and the second linear feedback circuit comprises a second feedback circuit connected in series resistor and a second feedback capacitor.
The push-pull power amplifier circuit according to claim 10, wherein the first bias circuit is coupled to the first end of the first capacitor through a first resistor, and the second bias circuit is coupled to the first capacitor through a second resistor to the second terminal of the first capacitor.
The push-pull power amplifier circuit according to claim 13, wherein the first bias circuit comprises a first bias transistor, the first end of the first bias transistor is connected to the first bias power supply port, so The second terminal of the first bias transistor is connected to the first power supply terminal, and the third terminal of the first bias transistor is connected to the first resistor;

The second bias circuit includes a second bias transistor, the first end of the second bias transistor is connected to the second bias power port, and the second end of the second bias transistor is connected to the second power supply port terminals, and the third terminal of the second bias transistor is connected to the second resistor.
A radio frequency front-end module, comprising the push-pull power amplifier circuit according to any one of claims 1-14.