WO2023005458A1 - Doherty power amplifier and radio-frequency front-end module - Google Patents

Abstract

Disclosed in the present application are a Doherty power amplifier and a radio-frequency front-end module. The Doherty power amplifier comprises a carrier amplification circuit, a peak amplification circuit, a first balun, a second balun and a first phase shift output network, wherein the carrier amplification circuit comprises a first push-pull power amplification circuit; the peak amplification circuit comprises a second push-pull power amplification circuit; the first push-pull power amplification circuit is coupled to an input end of the first balun, and the second push-pull power amplification circuit is coupled to an input end of the second balun; a first output end of the first balun is connected to a signal output end, a second output end of the first balun is connected to a first output end of the second balun, and a second output end of the second balun is connected to a grounding end; and the first phase shift output network is configured to perform phase shift on a peak amplification signal which is outputted by the peak amplification circuit, and to participate in impedance conversion of the Doherty power amplifier. By means of the technical solution, a Doherty power amplifier can support a larger bandwidth, thereby optimizing the bandwidth performance of the Doherty power amplifier.

Description

Doherty power amplifier and RF front-end module

This application is based on the Chinese invention application filed on July 30, 2021 with the application number 202110873864.4 and titled "A Doherty Power Amplifier and RF Front-End Module", and claims its priority.

technical field

The present application relates to the field of radio frequency technology, in particular to a Doherty power amplifier and a radio frequency front-end module.

Background technique

The key performance goal of the fifth-generation mobile communication technology (5G) is to greatly increase the transmission rate compared with 4G. The 5G new technology needs to adopt a radio frequency front-end with higher frequency, larger bandwidth, and higher-order QAM modulation, so that it is more important for the RF front-end. The design of power amplifiers imposes more stringent requirements. As a commonly used amplifier in power amplifiers, the Doherty power amplifier is widely used because of its high linearity and high efficiency. At present, the operating bandwidth of the Doherty power amplifier is often poor while ensuring linearity and high efficiency, which leads to the fact that the bandwidth performance of the Doherty power amplifier cannot meet the actual application requirements.

application content

Embodiments of the present application provide a Doherty power amplifier and a radio frequency front-end module to solve the problem of poor bandwidth of the Doherty power amplifier.

A Doherty power amplifier, comprising a carrier amplifying circuit, a peak amplifying circuit, a first balun, a second balun, and a first phase-shifting output network;

The carrier amplifying circuit includes a first push-pull power amplifying circuit; the peak amplifying circuit includes a second push-pull power amplifying circuit;

The first push-pull power amplifying circuit is coupled to the input end of the first balun, and the second push-pull power amplifying circuit is coupled to the input end of the second balun;

The first output terminal of the first balun is connected to the signal output terminal, the second output terminal of the first balun is connected to the first output terminal of the second balun, and the The second output terminal is connected to the ground terminal;

The first phase-shifting output network is configured to phase-shift the peak amplified signal output by the peak amplifying circuit, and participate in impedance conversion of the carrier amplifying circuit.

Further, the first phase-shifting output network is arranged between the second push-pull power amplifier circuit and the input end of the second balun.

Further, one end of the first phase-shifting output network is connected to the first output end of the second balun, and the other end of the first phase-shifting output network is connected to the ground.

Further, the first phase-shifting output network is configured to make the carrier amplified signal received by the first input end of the first balun and the peak amplified signal received by the second input end of the second balun 180 degrees out of phase.

Further, the first phase-shifting output network includes a first capacitor, one end of the first capacitor is connected to the first input end of the second balun, and the other end is connected to the second input end of the second balun. end connected.

Further, the first phase-shifting output network includes a first capacitor, one end of the first capacitor is connected to the first output end of the second balun, and the other end of the first capacitor is connected to the ground.

Further, the first push-pull power amplification circuit includes a first amplification branch and a second amplification branch; the second push-pull power amplification circuit includes a third amplification branch and a fourth amplification branch;

The output terminal of the first amplification branch is coupled to the first input terminal of the first balun, and the output terminal of the second amplification branch is coupled to the second input terminal of the first balun;

The third amplifying branch is coupled to the first input terminal of the second balun, and the fourth amplifying branch is coupled to the second input terminal of the second balun.

Further, the first phase-shifting output network includes a second capacitor and a third capacitor; one end of the second capacitor is connected to the first input end of the second balun, and the other end is connected to the ground; the first One end of the three capacitors is connected to the second input end of the second balun, and the other end is connected to the ground end.

Further, the Doherty power amplifier also includes a second phase-shifting output network, and the second phase-shifting output network is arranged between the first push-pull power amplifier circuit and the input end of the first balun .

Further, the difference between the phase applied to the peak amplified signal by the first phase-shifting output network and the phase applied to the carrier amplified signal by the second phase-shifted output network is 90 degrees.

Further, the first phase-shifting output network is configured to make the peak amplified signal received by the first input end of the second balun and the peak wave amplified signal received by the second input end of the second balun The phase difference is 180 degrees; the second phase-shifting output network is configured to make the carrier amplified signal received by the first input end of the first balun and the carrier wave received by the second input end of the first balun The phase difference of the amplified signal is 180 degrees.

Further, the second phase-shifting output network includes a first inductor and a second inductor, one end of the first inductor is coupled to the first input end of the first balun, and the other end of the first inductor is connected to the first input end of the first balun. connected to the ground; one end of the second inductor is coupled to the second input end of the first balun, and the other end of the second inductor is connected to the ground.

Further, the second phase-shifting output network includes a fourth capacitor and a fifth capacitor; one end of the fourth capacitor is connected to the first output end of the first push-pull power amplifier circuit, and the other end is connected to the first output end of the first push-pull power amplifier circuit. A balun is connected to the first input end; one end of the fifth capacitor is connected to the second output end of the first push-pull power amplifier circuit, and the other end is connected to the second input end of the first balun.

Further, the second phase-shifting output network includes a third inductor and a fourth inductor, one end of the third inductor is coupled to the first input end of the first balun, and the other end of the third inductor connected to the ground terminal; one terminal of the fourth inductor is coupled to the second input terminal of the first balun, and the other terminal of the fourth inductor is connected to the ground terminal.

Further, the Doherty power amplifier also includes a sixth capacitor, one end of the sixth capacitor is connected to the first output end of the first push-pull power amplifier circuit, and the other end of the sixth capacitor is connected to the first output end of the first push-pull power amplifier circuit. The second output end of the first push-pull power amplifier circuit is connected.

Further, the Doherty power amplifier also includes a power separator;

The power splitter is configured to receive a radio frequency input signal, split the radio frequency input signal into a carrier signal and output it to the carrier amplifier circuit and a peak signal to the peak amplifier circuit.

A radio frequency front-end module includes the above-mentioned Doherty power amplifier.

The above-mentioned Doherty power amplifier and RF front-end module, the Doherty power amplifier includes a carrier amplifier circuit, a peak amplifier circuit, a first balun, a second balun, and a first phase-shifting output network; the carrier amplifier circuit includes a first push-pull Power amplifying circuit; the peak amplifying circuit includes a second push-pull power amplifying circuit; the first push-pull power amplifying circuit is coupled to the input end of the first balun, and the second push-pull power amplifying circuit is coupled to the input end of the second balun; The first output terminal of the first balun is connected to the signal output terminal, the second output terminal of the first balun is connected to the first output terminal of the second balun, and the second output terminal of the second balun is connected to the ground terminal . The present application configures the first phase-shifting output network in the Doherty power amplifier in the above-mentioned embodiment, and the first phase-shifting output network can be used for the peak amplifying circuit when the first push-pull power amplifying circuit approaches or reaches a saturated state. The output peak amplified signal is phase-shifted, and when the first push-pull power amplifying circuit is not close to or reaches a saturated state, it can participate in the impedance conversion of the carrier amplifying circuit together with the first balun and the second balun, so that the multiple Corti power amplifiers support larger bandwidths, optimizing their bandwidth performance.

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 a schematic circuit diagram of a Doherty power amplifier in an embodiment of the present application;

Fig. 2 is another schematic circuit diagram of the Doherty power amplifier in an embodiment of the present application;

Fig. 3 is another schematic circuit diagram of the Doherty power amplifier in an embodiment of the present application;

Fig. 4 is another schematic circuit diagram of the Doherty power amplifier in an embodiment of the present application;

Fig. 5 is another schematic circuit diagram of the Doherty power amplifier in an embodiment of the present application;

Fig. 6 is another schematic circuit diagram of the Doherty power amplifier in an embodiment of the present application;

Fig. 7 is another schematic circuit diagram of the Doherty power amplifier in an embodiment of the present application;

Fig. 8 is another schematic circuit diagram of the Doherty power amplifier in an embodiment of the present application;

Fig. 9 is another schematic circuit diagram of the Doherty power amplifier in an embodiment of the present application;

FIG. 10 is another schematic circuit diagram of a Doherty power amplifier in an embodiment of the present application.

In the figure: 10, carrier amplification circuit; 11, first amplification branch 11; 12, second amplification branch 12; 20, peak amplification circuit; 21, third amplification branch 21; 22, fourth amplification branch 22 ; 30, the first balun; 40, the second balun; 50, the first phase-shift output network; 60, the second phase-shift output network; 70, the power splitter; 80, the first phase-shift input network; 90, The second phase-shifting input network.

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 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 to," "connected to" or "coupled to" another element or layer, it can be directly on the other element or layer, or directly on the other element or layer. Other elements or layers may be adjacent to, connected to or coupled to, 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.

In order to thoroughly understand the present application, detailed structures and steps will be provided in the following description to explain the technical solutions proposed in the present application. The preferred embodiments of the present application are described in detail as follows, however, the present application may have other implementations besides these detailed descriptions.

The present embodiment provides a Doherty power amplifier, as shown in Figure 1, comprising a carrier amplifier circuit 10, a peak amplifier circuit 20, a first balun 30, a second balun 40, a first phase-shifting output network 50; Amplifying circuit 10 comprises a first push-pull power amplifying circuit; peak amplifying circuit 20 comprises a second push-pull power amplifying circuit; the first push-pull power amplifying circuit is coupled to the input end of first balun 30, and the second push-pull power amplifying circuit Coupled to the input end of the second balun 40; the first output end of the first balun 30 is connected to the signal output end, and the second output end of the first balun 30 is connected to the first output end of the second balun 40 , the second output terminal of the second balun 40 is connected to the ground terminal; the first phase-shift output network 50 is configured to phase-shift the peak amplified signal output by the peak amplifying circuit 20 and participate in the impedance conversion of the carrier amplifying circuit 10 .

Wherein, the carrier amplifying circuit 10 includes a first push-pull power amplifying circuit configured to receive a carrier signal, amplify the carrier signal, and output a carrier amplified signal. The peak amplifying circuit 20 includes a second push-pull power amplifying circuit configured to receive a peak signal, amplify the peak signal, and output a peak amplified signal.

In a specific embodiment, the first push-pull power amplifying circuit is coupled to the input end of the first balun 30, the second push-pull power amplifying circuit is coupled to the input end of the second balun 40, and the first balun 30 One output terminal is connected to the signal output terminal, the second output terminal of the first balun 30 is connected to the first output terminal of the second balun 40 , and the second output terminal of the second balun 40 is connected to the ground terminal. The first balun 30 and the second balun 40 cooperate to convert and synthesize the carrier amplified signal output by the first push-pull power amplifier circuit and the peak amplified signal output by the second push-pull power amplifier circuit, and output the radio frequency amplified signal to the signal output terminal .

In a specific embodiment, before the first push-pull power amplifying circuit approaches or reaches a saturated state, the first push-pull power amplifying circuit receives the carrier signal, amplifies the received carrier signal, and outputs the amplified carrier signal to the first The input terminal of the balun 30, at this time the second push-pull power amplifier circuit is in a non-working state. When the first push-pull power amplifying circuit is close to or reaches saturation, the second push-pull power amplifying circuit works, the first push-pull power amplifying circuit receives the carrier signal, and amplifies the received carrier signal, and outputs the carrier amplified signal to At the input end of the first balun 30 , the second push-pull power amplifier circuit receives the peak signal, amplifies the received peak signal, and outputs the peak amplified signal to the input end of the second balun 40 .

In another specific embodiment, when the first push-pull power amplifier circuit approaches or reaches a saturated state, the first balun 30 cooperates with the second balun 40 to synthesize the carrier amplified signal and the peak amplified signal, and Dougherty The output impedance of the power amplifier is transformed to achieve impedance matching at the output of the Doherty power amplifier. For example, the impedance of the output terminal of the Doherty power amplifier usually needs to meet the impedance matching of 50 ohms.

In a specific embodiment, the first push-pull power amplifying circuit includes a first amplifying branch 11 and a second amplifying branch 12; the second push-pull power amplifying circuit includes a third amplifying branch 21 and a fourth amplifying branch 22 The output of the first amplification branch 11 is coupled to the first input of the first balun 30, and the output of the second amplification branch 12 is coupled to the second input of the first balun 30; the third amplification branch 21 is coupled to the first input terminal of the second balun 40 , and the fourth amplifying branch 22 is coupled to the second input terminal of the second balun 40 . Wherein, the first amplification branch 11 amplifies the received first carrier signal and outputs the first carrier amplified signal; the second amplifying branch 12 amplifies the received second carrier signal and outputs the second carrier amplified signal. The third amplification branch 21 amplifies the received first peak signal, and outputs the first peak amplified signal; the fourth amplifying branch 22 amplifies the second peak signal, and outputs the second peak amplified signal.

Optionally, the amplifying branch (the first amplifying branch and/or the second amplifying branch) may include at least one power amplifier stage, each power amplifier stage may include an amplifying transistor, or may include multiple cascaded stages amplifier transistors, or include a plurality of amplifier transistors connected in parallel. Optionally, the amplifying transistor may be a BJT transistor (eg, HBT transistor) or a field effect transistor.

In a specific embodiment, the first push-pull power amplifier circuit includes a first input conversion circuit, and the first input conversion circuit includes a first input conversion balun (not shown in the figure), and the first input conversion balun is configured as Receive an unbalanced carrier signal, and convert the unbalanced carrier signal into a balanced first carrier signal and a second carrier signal, the first carrier signal is input to the input end of the first amplification branch 11, and the second carrier signal is input To the input terminal of the second amplification branch 12. The second push-pull power amplifying circuit includes a second input conversion circuit, the second input conversion circuit includes a second input conversion balun (not shown in the figure), the second input conversion balun is configured to receive an unbalanced peak signal, And convert the unbalanced peak signal into a balanced first peak signal and a second peak signal, the first peak signal is input to the input end of the third amplification branch 21, and the second peak signal is input to the fourth amplification branch 22 .

Preferably, in this embodiment, the first input switching balun and the second input switching circuit are configured to make the phase of the peak signal presented to the peak amplifying circuit 20 lag behind the phase of the carrier signal presented to the carrier amplifying circuit 10 by 90 degrees. For example: the phase of the first carrier signal input to the input end of the first amplification branch 11 of the carrier amplification circuit 10 is 90 degrees, and the phase of the second carrier signal input to the input end of the second amplification branch 12 of the carrier amplification circuit 10 It is -90 degrees; the phase of the first peak signal input to the input end of the third amplification branch 21 in the peak amplification circuit 20 is 0 degree, and the phase of the first peak signal input to the input end of the fourth amplification branch 22 in the peak amplification circuit 20 is The phase of the two peak signals is -180 degrees. Wherein, the phase of the first peak signal is 90 degrees behind the phase of the first carrier signal; the phase of the second peak signal is 90 degrees behind the phase of the second carrier signal.

In a specific embodiment, as shown in FIG. 10 below, the Doherty power amplifier further includes a power splitter 70, and the power splitter 70 is configured to receive a radio frequency input signal, separate the radio frequency input signal into a carrier signal and output it to the carrier The amplifying circuit 10 and the peak signal are output to the peak amplifying circuit 20 .

In a specific embodiment, as shown in FIG. 10 below, in a specific embodiment, since the carrier signal output from the power separator 70 to the carrier amplifier circuit 10 and the peak signal output to the peak amplifier circuit 20 are in the same phase , that is, the power splitter 70 does not give a phase shift to the peak signal supplied to the peak amplifying circuit 20 or to the carrier signal supplied to the carrier amplifying circuit 10 . Therefore, a first phase-shift input network 80 is usually provided between the power splitter 70 and the carrier amplifier circuit 10 , and a second phase-shift input network 90 is usually provided between the power splitter 70 and the peak amplifier circuit 20 . The first phase-shifting input network 80 and the second phase-shifting input network 90 are configured to cause the peak signal presented to the peak amplifying circuit 20 to lag the phase of the carrier signal presented to the carrier amplifying circuit 10 by a first phase. Optionally, the first phase may be any phase such as 30 degrees, 60 degrees or 90 degrees.

Wherein, the first phase-shifting input network 80 and the second phase-shifting input network 90 may be lumped element networks, which are designed so that the phase of the peak signal presented to the peak amplifying circuit 20 is greater than the phase of the carrier signal presented to the carrier amplifying circuit 10 Lag 90 degrees. A lumped element network is a network that includes inductors, capacitors, and resistors as the main filtering and phase shifting components. For example: the first phase-shift input network 80 makes the carrier signal input to the carrier amplifier circuit 10 lead by 45 degrees (+45 degrees), and the peak signal input to the peak amplifier circuit 20 by the second phase-shift input network 90 lags by 45 degrees (-45 degree). By making the carrier signal input to the carrier amplifying circuit 10 advance 45 degrees (+45 degrees) and making the peak signal input to the peak amplifying circuit 20 lag behind by 45 degrees (-45 degrees), the input to the peak amplifying circuit 20 is realized. The peak signal is 90 degrees behind the phase of the carrier signal input to the carrier amplifier circuit 10 .

It should be noted that this embodiment describes that the first phase-shifting input network 80 makes the carrier signal input to the carrier amplifier circuit 10 lead by 45 degrees (+45 degrees), and the second phase-shifting input network 90 makes the input to the peak amplifying The peak signal in circuit 20 is lagged by 45 degrees (-45 degrees), but the phase shifts of the first phase shifting input network 80 and the second phase shifting input network 90 may be other combinations. For example, the first phase-shifting input network 80 can be used to make the carrier signal input to the carrier amplifier circuit 10 lead by 60 degrees (+60 degrees), and the second phase-shifting input network 90 can make the peak signal input to the peak amplifier circuit 20 Lag 30 degrees (-30 degrees), etc.

In a specific embodiment, the Doherty power amplifier includes a first phase-shift output network 50, which can phase-shift the peak amplified signal output by the peak amplifying circuit 20, and participate in the Doherty power Impedance conversion of the amplifier, which in turn enables the Doherty PA to support a larger bandwidth, optimizing its bandwidth performance. Exemplarily, before the first push-pull power amplifying circuit approaches or reaches a saturation state, the first phase shifting output network 50, the first balun 30 and the second balun 40 participate in the impedance transformation of the first push-pull power amplifying circuit; This enables the Doherty power amplifier to support a larger bandwidth and optimize its bandwidth performance. In another specific embodiment, when the first push-pull power amplifying circuit approaches or reaches a saturated state, the first phase-shifting output network 50, the first balun 30 and the second balun 40 participate in the entire Doherty power amplifier. Impedance conversion, that is, participating in the impedance conversion of the first push-pull power amplifier circuit and the second push-pull power amplifier circuit, so that the Doherty power amplifier supports a larger bandwidth and optimizes its bandwidth performance.

In a specific embodiment, when the carrier amplifying circuit 10 is approaching or reaching a saturated state, the peak amplifying circuit 20 is turned on. At this time, the carrier amplifying circuit 10 and the peak amplifying circuit 20 are both in working condition, and the first phase-shifting output network 50 can apply a phase to the peak amplified signal amplified by the peak amplifying circuit 20, so that the phase of the first peak amplified signal received by the first input end of the second balun 40 is the same as that received by the second input end of the second balun 40. The phase difference of the second peak amplified signal is 180 degrees, so as to ensure that the first balun 30 and the second balun 40 can effectively synthesize and convert the received carrier amplified signal and peak amplified signal, and output a radio frequency amplified signal.

In this embodiment, the Doherty power amplifier includes a carrier amplifying circuit 10, a peak amplifying circuit 20, a first balun 30, a second balun 40, and a first phase-shifting output network 50; the carrier amplifying circuit 10 includes a first pushing Pull power amplifying circuit; peak amplifying circuit 20 includes a second push-pull power amplifying circuit; the first push-pull power amplifying circuit is coupled to the input end of the first balun 30, and the second push-pull power amplifying circuit is coupled to the second balun 40 The input end of the first balun 30 is connected to the signal output end, the second output end of the first balun 30 is connected to the first output end of the second balun 40, and the second balun 40's The second output terminal is connected to the ground terminal. The present application configures the first phase-shift output network 50 in the Doherty power amplifier in the above-mentioned embodiment, and the first phase-shift output network 50 can phase-shift the peak amplified signal output by the peak amplifying circuit 20, and can When the first push-pull power amplifying circuit is not close to or reaches a saturated state, participate in the impedance conversion of the first push-pull power amplifying circuit, and when the first push-pull power amplifying circuit is close to or reach a saturated state, participate in the entire Doherty power Impedance conversion of the amplifier, so that the Doherty power amplifier supports a larger bandwidth, optimizing its bandwidth performance.

In one embodiment, as shown in FIG. 1 , the first phase-shifting output network 50 is disposed between the second push-pull power amplifier circuit and the input end of the second balun 40 .

As an example, when the carrier amplifying circuit 10 is not close to or before reaching the saturation state, the peak amplifying circuit 20 is closed and is in a non-working state. At this time, no signal passes through the peak amplifying circuit 20. By setting the first phase-shifting output network 50 to Between the second push-pull power amplifying circuit and the input end of the second balun 40, to ensure that the first balun 30 converts and outputs the received carrier amplified signal, the first phase-shifting output network 50, the first barun The balun 30 and the second balun 40 jointly participate in the impedance matching of the output end, so that under the joint action of the first phase-shifting output network 50, the first balun 30 and the second balun 40, not only the input to the second balun can be realized The phase shifting of the signal before the Balun 40 can also realize the output impedance matching of the Doherty power amplifier, so that the Doherty power amplifier can support a larger bandwidth, thereby optimizing its bandwidth performance.

As another example, when the carrier amplifying circuit 10 is approaching or reaching a saturated state, the peak amplifying circuit 20 is turned on. At this time, the carrier amplifying circuit 10 and the peak amplifying circuit 20 are both in working condition, and the first phase-shifting output network 50 can be Apply a phase to the peak amplified signal amplified by the peak amplifying circuit 20, so that the phase of the first peak amplified signal received by the first input end of the second balun 40 is the same as the phase of the second amplified signal received by the second input end of the second balun 40. The phase difference of the peak amplified signal is 180 degrees, so that the first balun 30 and the second balun 40 can effectively synthesize and convert the received carrier amplified signal and peak amplified signal, and output the radio frequency amplified signal.

In one embodiment, as shown in FIG. 2 , one end of the first phase-shifting output network 50 is connected to the first output end of the second balun 40 , and the other end of the first phase-shifting output network 50 is connected to the ground.

As an example, when the carrier amplifying circuit 10 is not close to or reaches a saturated state, the peak amplifying circuit 20 is turned off and is in a non-operating state. At this time, no signal passes through the peak amplifying circuit 20. One end is connected to the first output end of the second balun 40, and the other end of the first phase-shift output network 50 is connected to the ground end, that is, the first output end of the second balun 40 is connected to the ground through the first phase-shift output network 50 terminal connection to form a path to the ground to ensure that the first balun 30 converts and outputs the received carrier amplified signal; and the first balun 30, the second balun 40 and the first phase-shifting output network 50 jointly participate in the output end impedance matching, so that under the joint action of the first balun 30, the second balun 40 and the first phase-shift output network 50, not only the phase shift of the peak amplified signal can be realized, but also the first push-pull power Impedance conversion of the amplifying circuit enables the Doherty power amplifier to support a larger bandwidth, thereby optimizing its bandwidth performance.

As another example, when the carrier amplifying circuit 10 is approaching or reaching a saturated state, the peak amplifying circuit 20 is turned on. At this time, the carrier amplifying circuit 10 and the peak amplifying circuit 20 are both in working condition, and the first phase-shifting output network 50 can be Apply a phase to the peak amplified signal amplified by the peak amplifying circuit 20, so as to ensure that the first balun 30 and the second balun 40 can effectively synthesize and convert the received carrier amplified signal and peak amplified signal, and output the radio frequency amplified signal , to ensure that the first balun 30 and the second balun 40 can effectively synthesize and convert the received carrier amplified signal and the peak amplified signal, and output the radio frequency amplified signal. At the same time, they can also participate in the first push-pull power amplifying circuit and the second The impedance conversion of the push-pull power amplifier circuit enables the Doherty power amplifier to support a larger bandwidth, thereby optimizing its bandwidth performance.

In one embodiment, the first phase-shifting output network 50 is configured to make the carrier amplified signal received by the first input end of the first balun 30 and the peak amplified signal received by the second input end of the second balun 40 180 degrees out of phase.

As an example, under the joint action of the first phase-shifting input network 80 and the second phase-shifting input network 90, the phase of the peak signal presented to the peak amplifying circuit 20 is 90 degrees behind the phase of the carrier signal presented to the carrier amplifying circuit 10 Finally, in this example, the first phase-shifting output network 50 is configured to apply a phase lagging behind the carrier amplified signal by 90 degrees to the peak amplified signal, so that the carrier amplified signal received by the first input terminal of the first balun 30 is the same as the first The phase difference of the peak amplified signal received by the second input terminal of the second balun 40 is 180 degrees, so as to ensure that the configuration of the first balun 30 and the second balun 40 can effectively synthesize and convert the received carrier amplified signal and peak amplified signal , output RF amplified signal.

In one embodiment, as shown in FIG. 3 , the first phase-shifting output network 50 includes a first capacitor C51, one end of the first capacitor C51 is connected to the first input end of the second balun 40, and the other end is connected to the second balun 40. The second input terminal of Lun 40 is connected.

In a specific embodiment, the first phase-shifting output network 50 includes a first capacitor C51, by connecting one end of the first capacitor C51 to the first input end of the second balun 40, and the other end to the second balun 40 The second input terminal is connected to ensure that the first balun 30 and the second balun 40 convert and output the received carrier amplified signal, and the first capacitor C51 can provide a certain impedance, so as to be compatible with the first balun 30 and the second balun. Two baluns 40 cooperate to convert the output impedance, so that under the joint action of the first capacitor C51, the first balun 30 and the second balun 40, not only the output impedance matching of the Doherty power amplifier can be realized, but also Enables Doherty power amplifiers to support larger bandwidths, thereby optimizing their bandwidth performance.

As another example, when the carrier amplifying circuit 10 approaches or reaches a saturated state, the peak amplifying circuit 20 is turned on. At this time, the first capacitor C51 participates in the impedance of the output terminal together with the first balun 30 and the second balun 40 In addition to matching, a phase can also be applied to the peak amplified signal output by the peak amplifying circuit 20, so that the peak amplified signal input to the second input end of the second balun 40 is amplified more than the carrier input to the first input end of the first balun 30 The phase of the signal lags by 180 degrees, so as to ensure that the first balun 30 and the second balun 40 can convert and synthesize the peak amplified signal and the carrier amplified signal, and output the radio frequency amplified signal.

In a specific embodiment, the magnitude of the phase applied to the peak amplified signal can be adjusted by adjusting the capacitance of the first capacitor C51. For example, by adjusting the capacitance value of the first capacitor C51 , a phase of −45 degrees is applied to the peak amplified signal output by the peak amplifying circuit 20 .

It should be noted that the first capacitor C51 can also suppress the harmonic signal generated at the output end of the second push-pull power amplifier circuit. The harmonic signal is preferably an odd harmonic signal. Optionally, the odd harmonic signal may be, for example, at least one of a third harmonic signal, a fifth harmonic signal, and a seventh harmonic signal. Preferably, the odd harmonic signal is a third harmonic signal.

In a specific embodiment, by connecting one end of the first capacitor C51 to the first input end of the second balun 40, and the other end to the second input end of the second balun 40, the carrier amplifier circuit 10 is close to or Before reaching the saturation state, cooperate with the first balun 30 and the second balun 40 to convert the output impedance, so that the Doherty power amplifier can support a larger bandwidth while realizing the output impedance matching of the Doherty power amplifier. When the carrier amplifier circuit 10 is close to or reaches a saturated state, a phase is applied to the peak amplified signal output by the peak amplifying circuit 20, so that the peak amplified signal input to the second input terminal of the second balun 40 is higher than that input to the first balun 30 The phase of the amplified carrier signal at the first input terminal of the first input port lags behind by 180 degrees, so as to ensure that the first balun 30 and the second balun 40 can convert and synthesize the peak amplified signal and the amplified carrier signal, and output a radio frequency amplified signal.

In one embodiment, as shown in FIG. 4 , the first phase-shifting output network 50 includes a first capacitor C51, one end of the first capacitor C51 is connected to the first output end of the second balun 40, and the other end of the first capacitor C51 Connect to ground.

In a specific embodiment, in order to realize the output impedance matching of the Doherty power amplifier and at the same time enable the Doherty power amplifier to support a larger bandwidth, the first phase-shifting output network 50 in this embodiment One end of the capacitor C51 is connected to the first output end of the second balun 40, and the other end of the first capacitor C51 is connected to the ground. When the carrier amplifier circuit 10 is close to or before reaching the saturation state, since one end of the first capacitor C51 is connected to the first output end of the second balun 40, the other end of the first capacitor C51 and the ground end form a path to the ground, This ensures that the first balun 30 and the second balun 40 can convert and output the received carrier amplified signal, and the first capacitor C51 can provide a certain impedance, so as to cooperate with the first balun 30 and the second balun 40 The output impedance is converted, so that under the joint action of the first capacitor C51, the first balun 30 and the second balun 40, not only the output impedance matching of the Doherty power amplifier can be realized, but also the Doherty power amplifier can be made The amplifier supports a larger bandwidth, thereby optimizing its bandwidth performance.

As another example, when the carrier amplifying circuit 10 approaches or reaches a saturated state, the peak amplifying circuit 20 is turned on. At this time, the first capacitor C51 participates in the impedance of the output terminal together with the first balun 30 and the second balun 40 In addition to matching, a phase can also be applied to the peak amplified signal output by the peak amplifying circuit 20, so that the peak amplified signal input to the second input end of the second balun 40 is amplified more than the carrier input to the first input end of the first balun 30 The phase of the signal lags by 180 degrees, so as to ensure that the first balun 30 and the second balun 40 can convert and synthesize the peak amplified signal and the carrier amplified signal, and output the radio frequency amplified signal.

In one embodiment, as shown in FIG. 5, the first phase-shifting output network 50 includes a second capacitor C52 and a third capacitor C53; one end of the second capacitor C52 is connected to the first input end of the second balun 40, and the other One end is connected to the ground; one end of the third capacitor C53 is connected to the second input end of the second balun 40 , and the other end is connected to the ground.

In a specific embodiment, in order to realize the output impedance matching of the Doherty power amplifier while enabling the Doherty power amplifier to support a larger bandwidth, this embodiment connects one end of the second capacitor C52 to the second balun Connect the first input end of 40 to the ground end; connect one end of the third capacitor C53 to the second input end of the second balun 40 and connect the other end to the ground end.

When the carrier amplifier circuit 10 is close to or before reaching the saturation state, since one end of the second capacitor C52 is connected to the first input end of the second balun 40, and the other end is grounded, forming a path to the ground, the third capacitor C53 One end is connected to the second input end of the second balun 40, and the other end is connected to the ground end to form another path to the ground, thereby ensuring that the first balun 30 and the second balun 40 can convert the received carrier amplified signal output, and the second capacitor C52 and the third capacitor C53 can provide a certain impedance, so as to cooperate with the first balun 30 and the second balun 40 to convert the output impedance, so that the second capacitor C52, the third capacitor C53 , the first balun 30 and the second balun 40 can not only realize the output impedance matching of the Doherty power amplifier, but also enable the Doherty power amplifier to support a larger bandwidth, thereby optimizing its bandwidth performance.

As another example, when the carrier amplifying circuit 10 approaches or reaches a saturated state, the peak amplifying circuit 20 is turned on. At this time, the second capacitor C52 and the third capacitor C53 participate in the output terminal together with the first phase-shifting output network 50. In addition to impedance matching, a phase can also be applied to the peak amplified signal output by the peak amplifying circuit 20, so that the peak amplified signal input to the second input end of the second balun 40 is higher than the carrier wave input to the first input end of the first balun 30. The phase of the amplified signal lags by 180 degrees, so as to ensure that the first balun 30 and the second balun 40 can convert and synthesize the peak amplified signal and the carrier amplified signal, and output the radio frequency amplified signal.

In one embodiment, as shown in FIG. 6, the Doherty power amplifier also includes a second phase-shifting output network 60, and the second phase-shifting output network 60 is arranged between the first push-pull power amplifying circuit and the first balun 30. between the input terminals.

Specifically, the Doherty power amplifier also includes a second phase-shifting output network 60, which is arranged between the output end of the first push-pull power amplifying circuit and the input end of the first balun 30, The second phase-shifting output network 60 is configured to apply a phase shift to the carrier amplified signal output from the output terminal of the first push-pull power amplifying circuit, so that the phase ratio of the carrier amplified signal presented to the first input terminal of the first balun 30 is The phase lead of the peak amplified signal presented to the second input of the second balun 40 is 180 degrees.

In a specific embodiment, one end of the second phase-shifting output network 60 is connected to the output end of the first push-pull power amplifier circuit, and the other end is connected to the input end of the first balun 30, and the second phase-shifting output network 60 is connected to the first A carrier amplified signal output from an output terminal of a push-pull power amplifying circuit is applied with a first phase (for example: leading by 45 degrees (+45 degrees)). The first phase-shifting output network 50 applies a second phase shift (for example: a lag of 45 degrees (-45 degrees)) to the peak amplified signal output from the output terminal of the second push-pull power amplifying circuit. Wherein, the difference between the phase applied to the carrier amplified signal by the second phase-shifted output network 60 and the phase applied to the peak amplified signal by the first phase-shifted output network 50 is 90 degrees.

In a specific embodiment, due to the effect of the first phase-shifting input network 80 and the second phase-shifting input network 90, the peak signal input to the second push-pull power amplifier circuit is higher than the peak signal input to the first push-pull power amplifier circuit The phase of the carrier signal lags by 90 degrees, that is, the phase of the peak amplified signal that is not phase-shifted by the first phase-shifting output network 50 is 90 degrees behind the phase of the carrier amplified signal that is not phase-shifted by the second phase-shifting output network 60, Therefore, the second phase-shift output network 60 applies a phase shift (for example: leading 45 degrees (+45 degrees)) to the carrier amplified signal output by the output terminal of the first push-pull power amplifier circuit, and the first phase-shift output network 50 pairs After the peak amplified signal output by the output terminal of the second push-pull power amplifying circuit is applied with a phase shift (for example: lagging by 45 degrees (-45 degrees)), the phase ratio of the carrier amplified signal input to the first input terminal of the first balun 30 is The phase of the peak amplified signal input to the second input terminal of the second balun 40 can be advanced by 180 degrees.

It should be noted that this embodiment describes that the first phase-shift output network 50 applies a phase shift with a lag of 45 degrees (-45 degrees) to the peak amplified signal output by the second push-pull power amplifier circuit, and the second phase-shift output network 60 applies a phase shift in advance of 45 degrees (+45 degrees) to the carrier amplified signal output by the first push-pull power amplifier circuit, but the phase shift applied to the peak amplified signal by the first phase-shifted output network 50 and the second phase-shifted output network The phase of the phase shift applied to the carrier amplified signal by 60 may be other combinations. For example, a phase shift of 60 degrees (-60 degrees) lagging behind can be applied to the peak amplified signal output by the second push-pull power amplifier circuit by using the first phase-shifting input-output network, and the second phase-shifting input network 90 is applied to the first push-pull The carrier amplified signal output by the power amplifying circuit is applied with a phase shift of 30 degrees (+30 degrees) in advance; it is only necessary to ensure that the phase of the second phase-shifted output network 60 applied to the carrier amplified signal is applied to the peak value by the first phase-shifted output network 50 The phase difference of the amplified signals may be 90 degrees.

In this embodiment, the Doherty power amplifier further includes a second phase-shifting output network 60, and the second phase-shifting output network 60 is arranged between the output end of the first push-pull power amplifying circuit and the input end of the first balun 30 During the period, the second phase-shift output network 60 applies a phase shift to the carrier amplified signal output by the output end of the first push-pull power amplifier circuit, and under the joint action of the first phase-shift output network 50 and the second phase-shift output network 60, Realize that the Doherty power amplifier is within the operating frequency range, and the second phase-shifting output network 60 is applied to the phase difference of the phase of the carrier amplified signal than the first phase-shifted output network 50 is applied to the peak amplified signal is always a constant value ( For example: the phase difference is 90 degrees), so that the bandwidth of the Doherty power amplifier can be kept balanced within the operating frequency range, thereby optimizing the bandwidth performance of the Doherty power amplifier.

In one embodiment, the first phase-shifting output network 50 is configured to make the peak amplified signal received by the first input end of the second balun 40 and the peak wave amplified signal received by the second input end of the second balun 40 The phase difference is 180 degrees; the second phase shift output network 60 is configured to make the carrier amplified signal received by the first input end of the first balun 30 and the carrier amplified signal received by the second input end of the first balun 30 The phase difference is 180 degrees.

In this embodiment, since the phase of the peak amplified signal without phase shifting by the first phase shifting output network 50 lags behind the phase of the carrier amplified signal without phase shifting through the second phase shifting output network 60 by about 90 degrees, and The second phase-shift output network 60 is applied to the phase difference of the phase of the carrier amplified signal than the first phase-shift output network 50 is applied to the peak amplified signal is 90 degrees (for example: the first phase-shift output network 50 makes the input to the second The peak signal in the push-pull power amplifying circuit lags behind 45 degrees (-45 degrees), and the second phase shift output network 60 makes the carrier signal input to the first push-pull power amplifying circuit lead 45 degrees (+45 degrees)), so , under the joint action of the first phase-shift output network 50 and the second phase-shift output network 60, so that the peak amplified signal received by the first input end of the second balun 40 is consistent with the second input end of the second balun 40 The phase difference of the received peak wave amplified signal is 180 degrees, so that the phase difference between the carrier amplified signal received by the first input end of the first balun 30 and the carrier amplified signal received by the second input end of the first balun 30 is 180 degrees ; so as to ensure that the first balun 30 and the second balun 40 can convert and synthesize the peak amplified signal and the carrier amplified signal, and output the radio frequency amplified signal.

It should be noted that if the phase of the peak amplified signal without phase shifting by the first phase-shifting output network 50 lags behind the phase of the carrier amplified signal without phase-shifting through the second phase-shifting output network 60 by about 60 degrees, then the second Two phase-shift output networks 60 are applied to the phase difference of the phase of the carrier amplified signal than the first phase-shift output network 50 is applied to the peak amplified signal needs to be 120 degrees (for example: the first phase-shift output network 50 makes the input to the second The peak signal in the push-pull power amplifying circuit lags behind by 60 degrees (-60 degrees), and the second phase shift output network 60 makes the carrier signal input to the first push-pull power amplifying circuit lead by 60 degrees (+60 degrees)), only It is necessary to ensure that the phase difference between the peak amplified signal received by the first input end of the second balun 40 and the peak wave amplified signal received by the second input end of the second balun 40 is 180 degrees, so that the first input of the first balun 30 The phase difference between the carrier amplified signal received at the first balun 30 and the carrier amplified signal received at the second input end of the first balun 30 is only 180 degrees.

In one embodiment, as shown in FIG. 6 , the second phase-shifting output network 60 includes a first inductor L61 and a second inductor L62, one end of the first inductor L61 is coupled to the first input end of the first balun 30, and the second The other end of an inductor L61 is connected to the ground; one end of the second inductor L62 is coupled to the second input end of the first balun 30, and the other end of the second inductor L62 is connected to the ground.

In this embodiment, the second phase-shifting output network 60 further includes a first inductor L61 and a second inductor L62; one end of the first inductor L61 is coupled to the first input end of the first balun 30, and the other end of the first inductor L61 One end is connected to the ground terminal. One end of the second inductor L62 is coupled to the second input end of the first balun 30 , and the other end of the second inductor L62 is connected to the ground. The first inductance L61, the second inductance L62 and the first phase-shift output network 50 can cooperate with the first balun 30 and the second balun 40, and the first inductance L61, the second inductance L62 and the first phase-shift output network 50 can work together with the first balun 30 and the second balun 40, not only can realize the output impedance matching of the Doherty power amplifier, but also apply advanced phase shift to the carrier amplified signal, so that in Doherty The operation of the power amplifier is in the frequency range, and the second phase-shifting output network 60 is applied to the phase difference of the phase of the carrier amplified signal than the first phase-shifted output network 50 is applied to the peak amplified signal is a constant value (for example: phase The difference is 90 degrees), so that the bandwidth can be kept balanced, so as to achieve the purpose of optimizing the bandwidth performance of the Doherty power amplifier.

In one embodiment, as shown in FIG. 7, the second phase-shifting output network 60 includes a fourth capacitor C61 and a fifth capacitor C62; one end of the fourth capacitor C61 is connected to the first output end of the first push-pull power amplifier circuit , the other end is connected to the first input end of the first balun 30; one end of the fifth capacitor C62 is connected to the second output end of the first push-pull power amplifier circuit, and the other end is connected to the second input end of the first balun 30 connected.

In this embodiment, the second phase-shifting output network 60 also includes a fourth capacitor C61 and a fifth capacitor C62; one end of the four capacitors is connected to the first output end of the first push-pull power amplifier circuit, and the other end is connected to the first output end of the first bar One end of the fifth capacitor C62 is connected to the second output end of the first push-pull power amplifier circuit, and the other end is connected to the second input end of the first balun 30 . The fourth capacitor C61, the fifth capacitor C62 and the first phase-shifting output network 50 can cooperate with the first balun 30 and the second balun 40, and the fourth capacitor C61, the fifth capacitor C62 and the first phase-shifting output network 50 can work together with the first balun 30 and the second balun 40, not only can realize the output impedance matching of the Doherty power amplifier, but also apply advanced phase shift to the carrier amplified signal, so that in Doherty The operation of the power amplifier is in the frequency range, and the second phase-shifting output network 60 is applied to the phase difference of the phase of the carrier amplified signal than the first phase-shifted output network 50 is applied to the peak amplified signal is a constant value (for example: phase The difference is 90 degrees), so that the bandwidth can be kept balanced, so as to achieve the purpose of optimizing the bandwidth performance of the Doherty power amplifier.

In one embodiment, as shown in FIG. 8 , the second phase shifting output network 60 further includes a third inductor L63 and a fourth inductor L64, one end of the third inductor L63 is coupled to the first input end of the first balun 30, The other end of the third inductor L63 is connected to the ground; one end of the fourth inductor L64 is coupled to the second input end of the first balun 30 , and the other end of the fourth inductor L64 is connected to the ground.

In this embodiment, the second phase-shifting output network 60 further includes a third inductor L63 and a fourth inductor L64; one end of the third inductor L63 is coupled to the first input end of the first balun 30, and the other end of the third inductor L63 connected to the ground; one end of the fourth inductor L64 is coupled to the second input end of the first balun 30 , and the other end of the fourth inductor L64 is connected to the ground. The third inductance L63, the fourth inductance L64, the fourth capacitor C61 and the fifth capacitor C62 can cooperate with the first balun 30 and the second balun 40, and the third inductance L63, the fourth inductance L64, and the fourth capacitor C61 Under the joint action of the fifth capacitor C62 and the first balun 30 and the second balun 40, not only can the output impedance matching of the Doherty power amplifier be realized, but also an advanced phase shift can be applied to the carrier amplified signal, so that in Within the operating frequency range of the Doherty power amplifier, the difference between the phase of the second phase-shifting output network 60 applied to the carrier amplified signal and the phase ratio of the first phase-shifted output network 50 applied to the peak amplified signal is always a constant value (for example : the phase difference is 90 degrees), so that the bandwidth can be kept balanced, so as to achieve the purpose of optimizing the bandwidth performance of the Doherty power amplifier.

In one embodiment, as shown in FIG. 9, the Doherty power amplifier further includes a sixth capacitor C1, one end of the sixth capacitor C1 is connected to the first output end of the first push-pull power amplifier circuit, and the sixth capacitor C1 The other end is connected with the second output end of the first push-pull power amplifier circuit.

In this embodiment, the Doherty power amplifier further includes a sixth capacitor C1, one end of the sixth capacitor C1 is connected to the first output end of the first push-pull power amplifier circuit, and the other end of the sixth capacitor C1 is connected to the first push-pull power amplifier circuit. The second output end of the pull power amplifying circuit is connected, and the sixth capacitor C1 is configured to suppress the harmonic signal generated by the output end of the first push-pull power amplifying circuit. The harmonic signal is preferably an odd harmonic signal. Optionally, the odd harmonic signal may be, for example, at least one of a third harmonic signal, a fifth harmonic signal, and a seventh harmonic signal. Preferably, the odd harmonic signal is a third harmonic signal.

In one embodiment, as shown in FIG. 10 , the Doherty power amplifier further includes a power splitter 70; the power splitter 70 is configured to receive a radio frequency input signal, separate the radio frequency input signal into a carrier signal and output it to the carrier amplification circuit 10 and the peak signal output to the peak amplifying circuit 20.

In this embodiment, the input end of the power splitter 70 is used as a signal input end for receiving a radio frequency input signal, the first output end is connected to the input end of the carrier amplifier circuit 10, and the second output end is connected to the peak amplifier circuit 20. connected to the input. Before the carrier amplifying circuit 10 approaches or reaches a saturated state, the power splitter 70 directly transmits the received radio frequency input signal to the carrier amplifying circuit 10; when the carrier amplifying circuit 10 approaches or reaches a saturated state, the power splitter 70 is used for receiving The RF input signal is separated and processed to generate a carrier signal and a peak signal; and the carrier signal is output to the carrier amplifier circuit 10, and the peak signal is output to the peak amplifier circuit 20.

In one embodiment, a radio frequency front-end module is provided, including the Doherty power amplifier in any one of the above embodiments. Exemplarily, the Doherty power amplifier includes a carrier amplifying circuit 10, a peak amplifying circuit 20, a first balun 30, a second balun 40, and a first phase-shifting output network 50; the carrier amplifying circuit 10 includes a first push-pull Power amplifying circuit; the peak amplifying circuit 20 includes a second push-pull power amplifying circuit; the first push-pull power amplifying circuit is coupled to the input end of the first balun 30, and the second push-pull power amplifying circuit is coupled to the second balun 40 Input end; the first output end of the first balun 30 is connected with the signal output end, the second output end of the first balun 30 is connected with the first output end of the second balun 40, the first output end of the second balun 40 The two output terminals are connected to the ground terminal. The present application configures the first phase-shifting output network 50 capable of phase-shifting the peak amplified signal output by the peak amplifying circuit 20 and participating in the impedance conversion of the Doherty power amplifier in the Doherty power amplifier in the above embodiment , so that the Doherty power amplifier can support a larger bandwidth and optimize its bandwidth performance.

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 embodiments Modifications to the technical solutions described in the examples, or equivalent replacements for 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 (17)

1. A Doherty power amplifier, including a carrier amplifying circuit, a peak amplifying circuit, a first balun, a second balun, and a first phase-shifting output network;

   The carrier amplifying circuit includes a first push-pull power amplifying circuit; the peak amplifying circuit includes a second push-pull power amplifying circuit;

   The first push-pull power amplifying circuit is coupled to the input end of the first balun, and the second push-pull power amplifying circuit is coupled to the input end of the second balun;

   The first output terminal of the first balun is connected to the signal output terminal, the second output terminal of the first balun is connected to the first output terminal of the second balun, and the The second output terminal is connected to the ground terminal;

   The first phase-shifting output network is configured to phase-shift the peak amplified signal output by the peak amplifying circuit, and participate in impedance conversion of the carrier amplifying circuit.
2. The Doherty power amplifier according to claim 1, wherein the first phase-shifting output network is arranged between the second push-pull power amplifier circuit and the input terminal of the second balun.
3. The Doherty power amplifier as claimed in claim 1, wherein one end of the first phase-shifted output network is connected to the first output end of the second balun, and the other end of the first phase-shifted output network Connect to ground.
4. The Doherty power amplifier according to claim 1, wherein the first phase-shifted output network is configured to make the carrier amplified signal received by the first input terminal of the first balun and the second balun The phases of the peak amplified signals received at the second input terminals of the len are 180 degrees out of phase.
5. The Doherty power amplifier as claimed in claim 2, wherein the first phase-shifting output network comprises a first capacitor, one end of the first capacitor is connected to the first input end of the second balun, and the other One end is connected with the second input end of the second balun.
6. The Doherty power amplifier as claimed in claim 3, wherein said first phase shifting output network comprises a first capacitor, one end of said first capacitor is connected to the first output end of said second balun, said The other end of the first capacitor is connected to the ground.
7. The Doherty power amplifier according to claim 1, wherein said first push-pull power amplifying circuit comprises a first amplifying branch and a second amplifying branch; said second push-pull power amplifying circuit comprises a third amplifying branch and the fourth amplifying branch;

   The output terminal of the first amplification branch is coupled to the first input terminal of the first balun, and the output terminal of the second amplification branch is coupled to the second input terminal of the first balun;

   The third amplifying branch is coupled to the first input terminal of the second balun, and the fourth amplifying branch is coupled to the second input terminal of the second balun.
8. The Doherty power amplifier as claimed in claim 7, wherein said first phase shifting output network comprises a second capacitor and a third capacitor; one end of said second capacitor is connected to the first input of said second balun One end of the third capacitor is connected to the second input end of the second balun, and the other end is connected to the ground end.
9. The Doherty power amplifier according to claim 1, wherein the Doherty power amplifier further comprises a second phase-shifting output network, and the second phase-shifting output network is arranged in the first push-pull power amplifying circuit and the input of the first balun.
10. The Doherty power amplifier of claim 9, wherein the phase of the peak amplified signal applied to the peak amplified signal by the first phase-shifted output network is the same as the phase applied to the carrier amplified signal by the second phase-shifted output network The difference is 90 degrees.
11. The Doherty power amplifier of claim 9, wherein the first phase-shifted output network is configured to make the peak amplified signal received by the first input of the second balun equal to the second balun The phase difference of the peak wave amplified signal received by the second input end of the balun is 180 degrees; the second phase shift output network is configured to make the carrier amplified signal received by the first input end of the first balun and the The phase difference of the carrier amplified signal received by the second input terminal of the first balun is 180 degrees.
12. The Doherty power amplifier as claimed in claim 9, wherein said second phase-shifted output network comprises a first inductor and a second inductor, and one end of said first inductor is coupled to a first first balun of said first balun. The other end of the first inductor is connected to the ground; one end of the second inductor is coupled to the second input end of the first balun, and the other end of the second inductor is connected to the ground.
13. The Doherty power amplifier as claimed in claim 9, wherein said second phase-shifting output network comprises a fourth capacitor and a fifth capacitor; one end of said fourth capacitor is connected to said first push-pull power amplifying circuit The first output end is connected, and the other end is connected to the first input end of the first balun; one end of the fifth capacitor is connected to the second output end of the first push-pull power amplifier circuit, and the other end is connected to the second output end of the first push-pull power amplifier circuit. connected to the second input end of the first balun.
14. The Doherty power amplifier as claimed in claim 13, wherein the second phase-shifted output network further includes a third inductor and a fourth inductor, and one end of the third inductor is coupled to a first balun of the first balun. An input end, the other end of the third inductor is connected to the ground end; one end of the fourth inductor is coupled to the second input end of the first balun, and the other end of the fourth inductor is connected to the ground end.
15. The Doherty power amplifier according to claim 10, wherein the Doherty power amplifier further comprises a sixth capacitor, one end of the sixth capacitor is connected to the first output end of the first push-pull power amplifying circuit The other end of the sixth capacitor is connected to the second output end of the first push-pull power amplifier circuit.
16. The Doherty power amplifier of claim 1, wherein the Doherty power amplifier further comprises a power splitter;

    The power splitter is configured to receive a radio frequency input signal, split the radio frequency input signal into a carrier signal and output it to the carrier amplifier circuit and a peak signal to the peak amplifier circuit.
17. A radio frequency front-end module, comprising the Doherty power amplifier according to any one of claims 1-16.

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