A doherty power amplifier

Abstract

The embodiment of the application discloses a Doherty power amplifier, and the input end of a power amplification circuit in the Doherty power amplifier is connected with an input stray capacitance compensation circuit in series to compensate for the admittance change caused by the input stray capacitance of the power amplification circuit; and the output end of the power amplification circuit in the Doherty power amplifier is connected with an output stray capacitance compensation circuit in series to compensate for the admittance change caused by the output stray capacitance of the power amplification circuit. In this way, the Doherty power amplifier can improve the problems of nonlinear distortion and efficiency reduction caused by the characteristics of the elements in the Doherty power amplifier in the bandwidth application, thereby improving the communication quality of the communication network and reducing the power consumption of the communication base station.

Description

Technical Field

[0001] This application relates to the field of power amplifiers, and more particularly to a Dougherty power amplifier. Background Technology

[0002] With the rapid construction of communication networks, the demand for mobile communication base stations has increased significantly. This drastically expands the bandwidth of instantaneous communication signals that these base stations need to handle, thus enabling faster download speeds. For example, the power consumption of a fifth-generation (5G) communication base station will be three to four times that of a fourth-generation (4G) communication network. Therefore, the high power consumption of communication base stations has become one of the main obstacles to the large-scale deployment of communication networks.

[0003] With the increase in communication signal bandwidth, the requirements for the bandwidth performance of power amplifiers, including video bandwidth (VBW), are becoming increasingly stringent. While Dougherty power amplifiers are widely used in communication base stations as a low-power, high-efficiency solution, they exhibit significant limitations when facing bandwidth demands. Due to the inherent characteristics of their components, Dougherty power amplifiers suffer from nonlinear distortion and efficiency reduction in bandwidth applications, and these problems become more severe, especially with increasing bandwidth requirements.

[0004] Due to the aforementioned shortcomings of the Dougherty power amplifier, it exhibits a significant performance bottleneck when processing signals in communication networks. Therefore, it is imperative to improve it to meet the high bandwidth and high efficiency requirements of communication base stations in communication networks, thereby improving the communication quality of communication networks and reducing the power consumption of communication base stations. Summary of the Invention

[0005] This application provides a Dougherty power amplifier that can improve the communication quality of communication networks using the Dougherty power amplifier and reduce the power consumption of communication base stations.

[0006] This application provides a Dougherty power amplifier, comprising:

[0007] The input signal is divided into a main signal and an auxiliary signal by the signal distribution circuit 1, and transmitted to the main circuit and auxiliary circuit respectively. In the main circuit, the main signal is transmitted to the combining circuit 8 after being impedance matched by the main input matching circuit 2, amplified by the main power amplifier circuit 3, and impedance matched by the main output matching circuit 4. In the auxiliary circuit, the auxiliary signal is transmitted to the combining circuit 8 after being impedance matched by the auxiliary input matching circuit 5, amplified by the auxiliary power amplifier circuit 6, and impedance matched by the auxiliary output matching circuit 7. The combining circuit 8 combines the processed main signal and auxiliary signal and outputs them. The Dougherty power amplifier also includes:

[0008] A first input parasitic capacitance compensation circuit 14 is connected in series at the input terminal of the main power amplifier circuit 3 to compensate for the admittance change caused by the input parasitic capacitance of the main power amplifier circuit 3 in the main circuit.

[0009] A first output parasitic capacitance compensation circuit 15 is connected in series at the output terminal of the main power amplifier circuit 3 to compensate for the admittance change caused by the output parasitic capacitance of the main power amplifier circuit 3 in the main circuit.

[0010] A second input parasitic capacitance compensation circuit 16 is connected in series with the input terminal of the auxiliary power amplifier circuit 6 to compensate for the admittance change caused by the input parasitic capacitance of the auxiliary power amplifier circuit 6 in the auxiliary circuit; and,

[0011] A second output parasitic capacitance compensation circuit 17 is connected in series at the output terminal of the auxiliary power amplifier circuit 6 to compensate for the admittance change caused by the output parasitic capacitance of the auxiliary power amplifier circuit 6 in the auxiliary circuit.

[0012] In this embodiment, the second output parasitic capacitance compensation circuit 17 also adjusts the open-circuit characteristics of the auxiliary circuit during the power back-off process of the Dougherty power amplifier.

[0013] In this embodiment, the first input parasitic capacitance compensation circuit 14 or the second input parasitic capacitance compensation circuit 16 includes: a first conductance compensation sub-circuit and a first susceptance compensation sub-circuit, wherein,

[0014] The first conductance compensation sub-circuit includes at least one inductor, or includes at least one inductor and at least one capacitor connected in series or parallel, to compensate for the conductance of the input parasitic capacitance of the main power amplifier circuit 3 in the admittance generated in the main circuit, or to compensate for the conductance of the input parasitic capacitance of the auxiliary power amplifier circuit 6 in the admittance generated in the auxiliary circuit.

[0015] The first susceptance compensation sub-circuit includes at least one variable capacitor equivalent element to compensate for the susceptance in the admittance generated by the input parasitic capacitance of the main power amplifier circuit 3 in the main circuit, or to compensate for the susceptance in the admittance generated by the input parasitic capacitance of the auxiliary power amplifier circuit 6 in the auxiliary circuit.

[0016] In this embodiment, the first output parasitic capacitance compensation circuit 15 or the second output parasitic capacitance compensation circuit 17 includes: a second conductance compensation sub-circuit and a second susceptance compensation sub-circuit, wherein,

[0017] The second conductance compensation sub-circuit includes at least one inductor, or includes at least one inductor and at least one capacitor connected in series or parallel, to compensate for the conductance of the parasitic capacitance of the main power amplifier circuit 3 output in the admittance generated in the main circuit, or to compensate for the conductance of the parasitic capacitance of the auxiliary power amplifier circuit 6 output in the admittance generated in the auxiliary circuit.

[0018] The second susceptance compensation sub-circuit includes at least one variable capacitor equivalent element to compensate for the susceptance in the admittance generated by the parasitic capacitance of the main power amplifier circuit 3 output in the main circuit, or to compensate for the susceptance in the admittance generated by the parasitic capacitance of the auxiliary power amplifier circuit 6 output in the auxiliary circuit.

[0019] In this embodiment, the first conductivity compensation sub-circuit is connected in series to the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6, and includes at least one of the following structures:

[0020] One inductor;

[0021] Two inductors connected in series;

[0022] A capacitor and an inductor connected in series;

[0023] A series-connected sub-circuit with two parallel capacitors and inductors;

[0024] And, a series-connected sub-circuit of two capacitors and inductors.

[0025] In this embodiment, the first susceptance compensation sub-circuit is connected to the end of the first conductance compensation sub-circuit that is furthest from the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6, or it is connected between two components in the first conductance compensation sub-circuit to pull down the first susceptance compensation sub-circuit; the first susceptance compensation sub-circuit includes at least one of the following structures:

[0026] A pull-down resistor is connected in series with an inductor, a capacitor, and a variable capacitor, and a pull-up resistor is connected between the capacitor and the variable capacitor.

[0027] The circuit is connected in series with an inductor, a capacitor, and a variable resistor, and then pulled down. A resistor is then pulled up between the capacitor and the variable resistor.

[0028] The circuit is connected in series with an inductor, a capacitor, and a variable resistor, then pulled down, and a resistor is pulled up between the capacitor and the variable resistor, and a capacitor is connected in parallel between the capacitor and the variable resistor.

[0029] The circuit is pulled down through a series inductor and a varactor diode;

[0030] The circuit is pulled down through an inductor and a transistor connected in series.

[0031] The circuit is pulled down through an inductor and a variable capacitor connected in series;

[0032] Pull-down via a varactor diode, a transistor, or a variable capacitor;

[0033] A capacitor and a variable capacitor are connected in series and then pulled down, and a resistor is pulled up between the capacitor and the variable capacitor;

[0034] A capacitor and a variable resistor are connected in series and then pulled down, and a resistor is pulled up between the capacitor and the variable resistor;

[0035] A capacitor and a variable resistor are connected in series and then pulled down, and a resistor is pulled up between the capacitor and the variable resistor, and a capacitor is connected in parallel between the capacitor and the variable resistor;

[0036] The circuit is connected in series with a parallel capacitor and an inductor sub-circuit and a variable capacitor, then pulled down, and a resistor is pulled up between the capacitor and the variable capacitor.

[0037] In this embodiment of the application, the second conductivity compensation sub-circuit is connected in series at the input terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6, and includes at least one of the following structures:

[0038] One inductor;

[0039] Two inductors connected in series;

[0040] A capacitor and an inductor connected in series;

[0041] A series-connected sub-circuit with two parallel capacitors and inductors;

[0042] And a series-connected sub-circuit of two capacitors and inductors.

[0043] In this embodiment, the second susceptance compensation sub-circuit is connected to the end of the second conductance compensation sub-circuit that is furthest from the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6; or it is connected between two components in the second conductance compensation sub-circuit to pull down the second susceptance compensation sub-circuit; the second susceptance compensation sub-circuit includes at least one of the following structures:

[0044] A pull-down resistor is connected in series with an inductor, a capacitor, and a variable capacitor, and a pull-up resistor is connected between the capacitor and the variable capacitor.

[0045] The circuit is connected in series with an inductor, a capacitor, and a variable resistor, and then pulled down. A resistor is then pulled up between the capacitor and the variable resistor.

[0046] The circuit is connected in series with an inductor, a capacitor, and a variable resistor, then pulled down, and a resistor is pulled up between the capacitor and the variable resistor, and a capacitor is connected in parallel between the capacitor and the variable resistor.

[0047] The circuit is pulled down through a series inductor and a varactor diode;

[0048] The circuit is pulled down through an inductor and a transistor connected in series.

[0049] The circuit is pulled down through an inductor and a variable capacitor connected in series;

[0050] Pull-down via a varactor diode, a transistor, or a variable capacitor;

[0051] A capacitor and a variable capacitor are connected in series and then pulled down, and a resistor is pulled up between the capacitor and the variable capacitor;

[0052] A capacitor and a variable resistor are connected in series and then pulled down, and a resistor is pulled up between the capacitor and the variable resistor;

[0053] A capacitor and a variable resistor are connected in series and then pulled down, and a resistor is pulled up between the capacitor and the variable resistor, and a capacitor is connected in parallel between the capacitor and the variable resistor;

[0054] Additionally, a pull-down circuit is formed by a series parallel capacitor-inductor sub-circuit and a variable capacitor, and a pull-up resistor is formed between the capacitor and the variable capacitor.

[0055] In this embodiment of the application, the synthesis circuit 8 includes: a phase adjustment circuit, which adjusts the phase of the auxiliary signal that has undergone output impedance matching to be aligned with the phase of the main signal that has undergone output impedance matching;

[0056] Alternatively, the phase of the main signal, which has undergone output impedance matching, can be adjusted to align with the phase of the auxiliary signal, which has also undergone output impedance matching. The adjusted signal and the phase-aligned signal are then output through the same node.

[0057] Furthermore, the synthesis circuit 8 includes: a phase compensation line element for adjusting the phase of the auxiliary signal after output impedance matching to align with the phase of the main signal after output impedance matching; or, for adjusting the phase of the main signal after output impedance matching to align with the phase of the auxiliary signal after output impedance matching; and an impedance transformer for performing impedance transformation on the main signal before or after phase adjustment; or, for performing impedance transformation on the auxiliary signal before or after phase adjustment; wherein the adjusted signal and the phase-aligned signal are output through the same node.

[0058] As seen above, in this embodiment of the invention, an input parasitic capacitance compensation circuit is connected in series at the input terminal of the power amplifier circuit in the Dougherty power amplifier to compensate for the admittance change caused by the input parasitic capacitance of the power amplifier circuit; an output parasitic capacitance compensation circuit is connected in series at the output terminal of the power amplifier circuit in the Dougherty power amplifier to compensate for the admittance change caused by the output parasitic capacitance of the power amplifier circuit. In this way, the Dougherty power amplifier, in bandwidth applications, compensates for problems such as nonlinear distortion and efficiency reduction caused by its own component characteristics, thereby improving the communication quality of the communication network and reducing the power consumption of the communication base station. Attached Figure Description

[0059] Figure 1A schematic diagram of the basic structure of the Dougherty power amplifier provided in the embodiments of this application;

[0060] Figure 2-1a This is a schematic diagram of a specific implementation example of the signal distribution circuit 1 provided in the embodiments of this application;

[0061] Figure 2-1b This is a schematic diagram of a specific implementation example two of the signal distribution circuit 1 provided in the embodiments of this application;

[0062] Figure 2-2 A schematic diagram illustrating a specific implementation example of the main input matching circuit 2 or the auxiliary input matching circuit 5 provided in the embodiments of this application;

[0063] Figure 2-3 A schematic diagram illustrating a specific implementation example of the main output matching circuit 4 or the auxiliary output matching circuit 7 provided in the embodiments of this application;

[0064] Figure 2-4 A schematic diagram illustrating a specific implementation example of the main pre-matching circuit 10 or the auxiliary pre-matching circuit 12 provided in the embodiments of this application;

[0065] Figure 2-5 A schematic diagram illustrating a specific implementation example of the main output power circuit 11 or auxiliary output power circuit 13 provided in the embodiments of this application;

[0066] Figure 3 A schematic diagram of the structure of an example of a Dougherty power amplifier provided in an embodiment of this application;

[0067] Figure 4 This is a schematic diagram of Example 2 of the structure of the Dougherty power amplifier provided in the embodiments of this application;

[0068] Figures 5-1 to 5-29 29 specific implementation circuit diagrams of the first input parasitic capacitance compensation circuit 14 or the second input parasitic capacitance compensation circuit 16 in the Dougherty power amplifier provided in the embodiments of this application;

[0069] Figures 6-1 to 6-29 29 specific implementation circuit diagrams of the first output parasitic capacitance compensation circuit 15 or the second output parasitic capacitance compensation circuit 17 in the Dougherty power amplifier provided in the embodiments of this application;

[0070] Figure 7 This is a schematic diagram of a specific implementation of the Dougherty power amplifier provided in an embodiment of this application;

[0071] Figure 8 Example three structural schematic diagrams of the Dougherty power amplifier provided in the embodiments of this application;

[0072] Figure 9 Example four structural schematic diagram of the Dougherty power amplifier provided in the embodiments of this application;

[0073] Figure 10 Example five structural schematic diagram of the Dougherty power amplifier provided in the embodiments of this application. Detailed Implementation

[0074] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0075] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0076] The technical solution of this application will be described in detail below with reference to specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0077] This application first briefly describes the structure of the existing Dougherty power amplifier, such as... Figure 1 As shown, Figure 1 This is a schematic diagram of the basic structure of the Dougherty power amplifier provided in an embodiment of this application. The Dougherty power amplifier includes:

[0078] Signal distribution circuit 1 divides the input signal to be amplified into a main signal and an auxiliary signal, transmits the main signal to the main path, and transmits the auxiliary signal to the auxiliary path.

[0079] In the main circuit, the main circuit signal is transmitted to the synthesis circuit 8 after being matched by the input impedance of the main input matching circuit 2, amplified by the main power amplifier circuit 3, and matched by the output impedance of the main output matching circuit 4.

[0080] In the auxiliary circuit, the auxiliary circuit signal is transmitted to the synthesis circuit 8 after being matched by the input impedance of the auxiliary input matching circuit 5, amplified by the auxiliary power amplifier circuit 6, and matched by the output impedance of the auxiliary output matching circuit 7.

[0081] The main signal after power amplification of the main circuit and the auxiliary signal after power amplification of the auxiliary circuit are combined by the synthesis circuit 8 and then output.

[0082] Among them, the main power amplifier circuit 3 is a Class AB power amplifier circuit, and the auxiliary power amplifier circuit 6 is a Class C power amplifier circuit.

[0083] The peripheral circuit of the Dougherty power amplifier further includes a back-end impedance circuit 9, used to perform impedance transformation on the synthesized signal output by the synthesizing circuit 8. Specifically, the back-end impedance circuit 9 can be implemented by an impedance transformer 91. The implementation form of the impedance transformer 91 is not limited; the embodiment of this application uses a combination of microstrip lines and parallel capacitors.

[0084] Here, the signal distribution circuit 1 includes a power divider or coupler 11 and a first phase adjustment circuit 12. The power divider or coupler 11 divides the input signal into two signals: a main signal and an auxiliary signal. The first phase adjustment circuit 12 adjusts the phase of the auxiliary signal by a set degree before inputting it into the auxiliary signal. The adjustment degree can be a delay of 90 degrees or an advance of 90 degrees, which is not limited here. Alternatively, the first phase adjustment circuit 12 adjusts the phase of the main signal by a set degree before inputting it into the main signal. The adjustment degree can also be a delay of 90 degrees or an advance of 90 degrees. The above two access methods are as follows: Figure 2-1a and Figure 2-1b As shown. In the following description, it is... Figure 2-1b The signal distribution circuit 1 shown is for illustrative purposes only and is a specific embodiment. It is understood that embodiments of this application may also be described in different ways. Figure 2-1a The signal distribution circuit 1 shown is implemented as described in this application, but the embodiments are not limited thereto.

[0085] The main input matching circuit 2 or the auxiliary input matching circuit 5 can be composed of capacitors and inductors, as shown in the specific example. Figure 2-2 As shown, Figure 2-2The schematic diagram of the main input matching circuit 2 or auxiliary input matching circuit 5 provided in the embodiments of this application includes: a capacitor C21 and an inductor L21 connected in series, a grounding capacitor C22 connected between the capacitor C21 and the inductor L21, and a grounding capacitor C23 connected at the output terminal of the inductor L21. The capacitor C21 is used for radio frequency coupling and DC bias isolation, and may also serve as part of the input impedance matching if necessary. The inductor L21, grounding capacitor C22, and grounding capacitor C23 are used for input impedance matching of the main signal or auxiliary signal. The inductor L21 can be implemented using distributed devices such as microstrip lines or striplines connected in series, and the grounding capacitors C22 and C23 can be implemented using distributed devices such as open-circuit microstrip line stubs or open-circuit striplines connected in parallel.

[0086] The main power amplifier circuit 3 or the auxiliary power amplifier circuit 6 includes a metal-oxide-semiconductor field-effect transistor (MOS), which can specifically be a gallium nitride (GaN) MOS.

[0087] The input terminal of the main power amplifier circuit 3 or the auxiliary power amplifier circuit 6 can also be pulled up to the bias voltage 1 or bias voltage 2 via the pull-up impedance transformer 91 to provide a static bias path and improve the input signal performance of the main power amplifier circuit 3 or the auxiliary power amplifier circuit 6.

[0088] The main output matching circuit 4 or the auxiliary output matching circuit 7 can be composed of an impedance transformer 91 connected in series with a capacitor C41, as shown in the specific example. Figure 2-3 As shown.

[0089] The synthesis circuit 8 includes at least a second phase adjustment circuit 81, which adjusts the phase of the auxiliary signal after output impedance matching to be aligned with the phase of the main signal after output impedance matching. Here, the phase adjustment of the auxiliary signal after output impedance matching can be advanced by 90 degrees.

[0090] In the main circuit of the Doherty power amplifier, a main pre-matching circuit 10 is connected in series between the main power amplifier circuit 3 and the main output matching circuit 4 to provide a suitable harmonic impedance for the second harmonic of the signal after power amplification processing of the main circuit.

[0091] In the auxiliary circuit of the Doherty power amplifier, an auxiliary pre-matching circuit 12 is connected in series between the auxiliary power amplification circuit 6 and the auxiliary output matching circuit 7, which is used to provide a suitable harmonic impedance for the second harmonic of the signal after power amplification in the auxiliary circuit.

[0092] Specific implementation examples of the main pre-matching circuit 10 or the auxiliary pre-matching circuit 12 are as follows: Figure 2-4As shown, it includes: an inductor L11 connected in series between the main power amplifier circuit 3 and the main output matching circuit 4, or between the auxiliary power amplifier circuit 6 and the auxiliary output matching circuit 7. The inductor L11 is pulled down to ground through the series inductor L12 and capacitor C11 to short-circuit the second harmonic of the signal after power amplification processing of the main circuit or auxiliary circuit.

[0093] In the main circuit of the Doherty power amplifier, a main output power supply circuit 11 is also connected between the main pre-matching circuit 10 and the main output matching circuit 4 to provide power to the main circuit and drive the load impedance of the main circuit.

[0094] In the auxiliary circuit of the Doherty power amplifier, an auxiliary output power supply circuit 13 is also connected between the auxiliary pre-matching circuit 12 and the auxiliary output matching circuit 7 to provide power to the auxiliary circuit and drive the load impedance of the auxiliary circuit.

[0095] Specific implementation examples of the main output power supply circuit 11 or the auxiliary output power supply circuit 13 are as follows: Figure 2-5 As shown, it includes: equivalent inductance L1111, decoupling capacitor C1111, and RF bypass capacitor C1112. The power supply terminal VDD is connected via the equivalent inductance L1111 between the main pre-matching circuit 10 and the main output matching circuit 4, or between the auxiliary pre-matching circuit 12 and the auxiliary output matching circuit 7, loading the power supply into the main or auxiliary circuit and providing load impedance for the main or auxiliary circuit. The decoupling capacitor C1111 and the RF bypass capacitor C1112 are connected in parallel between the power supply VDD and the equivalent inductance L1111 to provide RF isolation for the power supply.

[0096] In combination with the above Figure 1 ,and Figure 2-1b , Figure 2-2-2-5 The aforementioned structure forms Figure 3 The diagram shows an example of a Dougherty power amplifier. Of course, Dougherty power amplifiers can have other implementations; here, we will use... Figure 3 As an example, the embodiments of this application will be described in detail.

[0097] As can be seen from the background technology, due to the characteristics of the components in a Dougherty power amplifier, problems such as nonlinear distortion and reduced efficiency exist, making it difficult to meet the high bandwidth and high efficiency requirements of communication networks. These shortcomings are exacerbated when the main power amplifier circuit 3 and auxiliary power amplifier circuit 6 in the Dougherty power amplifier use gallium nitride (GaN) MOS components. When the frequency and power of the transmitted signal change, the input parasitic capacitance Cgs and output parasitic capacitance Cds of the GaN MOS change, which degrades the signal's bandwidth performance and transmission efficiency. Furthermore, the degradation of the input parasitic capacitance Cgs of the GaN MOS directly affects the gain and linearity of the input matching signal, making it difficult for the main power amplifier circuit 3 and auxiliary power amplifier circuit 6 to maintain stable performance over a wide frequency range, especially when the isolation is poor, which affects the power amplification efficiency of the input matching signal. The degradation of the output parasitic capacitance Cds of the GaN MOS leads to a decrease in the load modulation of the Dougherty power amplifier, thereby reducing the power efficiency and linearity of the Dougherty power amplifier. This phenomenon is particularly evident in digital pre-distortion (DPD) techniques for small resources.

[0098] As mentioned above, Figure 3 The VBW and power efficiency of the Dougherty power amplifier shown are essentially affected by the input parasitic capacitance Cgs and output parasitic capacitance Cds of the GaN MOS. As the bandwidth and power of the GaN MOS transmission signal increase, the frequency variation of the input matching signal between frequencies causes a sharp change in the input parasitic capacitance Cgs and the output parasitic capacitance Cds. This results in drastic changes in the impedance at the input and output terminals of the Dougherty power amplifier, causing VBW fluctuations and a decrease in power amplifier efficiency. In some cases, it can even lead to stability problems.

[0099] Because the input and output matching circuits in a Dougherty power amplifier often exhibit low-pass characteristics—meaning they function as small capacitors at low frequencies—their ability to adjust for VBW fluctuations is very limited. VBW is primarily adjusted by the equivalent inductance in the input, output, and power supply circuits. Theoretically, the smaller the inductance, the wider the VBW. However, in practice, to ensure the RF performance of the Dougherty amplifier, a certain amount of inductance must be maintained. Therefore, drastic changes in the input parasitic capacitance Cgs and output parasitic capacitance Cds of the GaN MOS in a Dougherty power amplifier can affect the VBW to some extent, causing an imbalance in the amplitude and phase of the intermodulation products. In certain sensitive applications, such as those with limited DPD resources, these changes can worsen the linearity and power amplifier efficiency of the Dougherty power amplifier.

[0100] The applicant discovered that while the main circuit of the Dougherty power amplifier has the greatest impact on the overall amplifier efficiency, the auxiliary circuit plays a traction and regulation role on the load of the main circuit. Therefore, in order to achieve the best overall performance of the Dougherty power amplifier, the auxiliary circuit must not only meet the load traction and regulation role of the main circuit, but also provide reasonable open-circuit characteristics during power back-off of the Dougherty power amplifier to ensure minimal loss of amplifier efficiency.

[0101] In the above-described situation, not only do the input parasitic capacitance Cgs and output parasitic capacitance Cds of the GaN MOS in the main circuit of the Dougherty power amplifier affect its VBW and power amplifier efficiency, but the input parasitic capacitance Cgs and output parasitic capacitance Cds of the GaN MOS in the auxiliary circuit also affect the VBW and power amplifier efficiency. Therefore, this embodiment of the application eliminates the influence of the VBW and power amplifier efficiency of the GaN MOS in the main circuit as well as the influence of the VBW and power amplifier efficiency of the GaN MOS in the auxiliary circuit.

[0102] This application embodiment addresses the variations in the input parasitic capacitance Cgs and output parasitic capacitance Cds of GaN MOS by introducing corresponding compensation circuits. These compensation circuits may include a variable resistor and a variable capacitor. On one hand, they counteract the load characteristics of the input and output parasitic capacitances Cgs and Cds of the GaN MOS; on the other hand, they adjust the resonant frequency of the impedance, thereby reducing the impact of variations in the input and output parasitic capacitances Cgs and Cds of the GaN MOS on the VBW and power amplifier efficiency of the Dougherty power amplifier, thus improving the power amplifier efficiency and VBW. Furthermore, by using the Dougherty power amplifier provided in this application embodiment, the communication quality of communication networks can be improved and the power consumption of communication base stations can be reduced.

[0103] Figure 4 This is a schematic diagram of Example 2 of the structure of the Dougherty power amplifier provided in the embodiments of this application, as shown below. Figure 4 As shown, this application is in Figure 3 Based on the structure of the Dougherty power amplifier shown, several compensation circuits were added, specifically including:

[0104] A first input parasitic capacitance compensation circuit 14 is connected in series at the input terminal of the main power amplifier circuit 3 to compensate for the admittance change caused by the input parasitic capacitance of the main power amplifier circuit 3 in the main circuit; a first output parasitic capacitance compensation circuit 15 is connected in series at the output terminal of the main power amplifier circuit 3 to compensate for the admittance change caused by the output parasitic capacitance of the main power amplifier circuit 3 in the main circuit; a second input parasitic capacitance compensation circuit 16 is connected in series at the input terminal of the auxiliary power amplifier circuit 6 to compensate for the admittance change caused by the input parasitic capacitance of the auxiliary power amplifier circuit 6 in the auxiliary circuit; and a second output parasitic capacitance compensation circuit 17 is connected in series at the output terminal of the auxiliary power amplifier circuit 6 to compensate for the admittance change caused by the output parasitic capacitance of the auxiliary power amplifier circuit 6 in the auxiliary circuit.

[0105] In this embodiment, the second output parasitic capacitance compensation circuit 17 not only compensates for the admittance change of the auxiliary circuit caused by the output parasitic capacitance Cds of the auxiliary power amplifier circuit 6, but also adjusts the open-circuit characteristics of the auxiliary circuit during the power back-off process of the Dougherty power amplifier.

[0106] Specifically, the first input parasitic capacitance compensation circuit 14 and the second input parasitic compensation circuit 16 have the same structure, including: a first conductance compensation sub-circuit and a first susceptance compensation sub-circuit, wherein,

[0107] The first conductance compensation sub-circuit includes at least one inductor, or includes at least one inductor and at least one capacitor connected in series or parallel, to compensate for the conductance of the input parasitic capacitance of the main power amplifier circuit 3 in the admittance generated in the main circuit, or to compensate for the conductance of the input parasitic capacitance of the auxiliary power amplifier circuit 6 in the admittance generated in the auxiliary circuit.

[0108] The first susceptance compensation sub-circuit includes at least one variable capacitor equivalent element to compensate for the susceptance in the admittance generated by the input parasitic capacitance of the main power amplifier circuit 3 in the main circuit, or to compensate for the susceptance in the admittance generated by the input parasitic capacitance of the auxiliary power amplifier circuit 6 in the auxiliary circuit.

[0109] Specifically, the first output parasitic capacitance compensation circuit 15 and the second output parasitic capacitance compensation circuit 17 have the same structure, including: a second conductance compensation sub-circuit and a second susceptance compensation sub-circuit, wherein,

[0110] The second conductance compensation sub-circuit includes at least one inductor, or includes at least one inductor and at least one capacitor connected in series or parallel, to compensate for the conductance of the parasitic capacitance of the main power amplifier circuit 3 output in the admittance generated in the main circuit, or to compensate for the conductance of the parasitic capacitance of the auxiliary power amplifier circuit 6 output in the admittance generated in the auxiliary circuit.

[0111] The second susceptance compensation sub-circuit includes at least one variable capacitor equivalent element to compensate for the susceptance in the admittance generated by the parasitic capacitance of the main power amplifier circuit 3 output in the main circuit, or to compensate for the susceptance in the admittance generated by the parasitic capacitance of the auxiliary power amplifier circuit 6 output in the auxiliary circuit.

[0112] In this embodiment, the first conductivity compensation sub-circuit is connected in series at the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6, and includes at least one of the following structures:

[0113] One inductor; two inductors in series; one capacitor and one inductor in series; two parallel capacitors and inductors in series; and two series capacitors and inductors in series.

[0114] The first susceptance compensation sub-circuit is connected to the end of the first conductance compensation sub-circuit that is furthest from the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6, or it is connected between two components in the first conductance compensation sub-circuit to pull down the first susceptance compensation sub-circuit. The first susceptance compensation sub-circuit includes at least one of the following structures:

[0115] Pull-down via an inductor, a capacitor, and a variable capacitor connected in series, with a resistor pulled up between the capacitor and the variable capacitor; pull-down via an inductor, a capacitor, and a variable resistor connected in series, with a resistor pulled up between the capacitor and the variable resistor; pull-down via an inductor, a capacitor, and a variable resistor connected in series, with a resistor pulled up between the capacitor and the variable resistor, and a capacitor connected in parallel between the capacitor and the variable resistor; pull-down via an inductor and a varactor diode connected in series; pull-down via an inductor and a transistor connected in series; pull-down via an inductor and a variable capacitor connected in series; pull-down via a... Pull-down via a varactor diode, a transistor, or a variable capacitor; pull-down via a capacitor and a variable capacitor connected in series, with a resistor pulled up between the capacitor and the variable capacitor; pull-down via a capacitor and a variable resistor connected in series, with a resistor pulled up between the capacitor and the variable resistor; pull-down via a capacitor and a variable resistor connected in series, with a resistor pulled up between the capacitor and the variable resistor, and a capacitor connected in parallel between the capacitor and the variable resistor; pull-down via a series parallel capacitor-inductor sub-circuit and a variable capacitor, with a resistor pulled up between the capacitor and the variable capacitor.

[0116] In practice, there are 29 ways to implement the first input parasitic capacitance compensation circuit 14 or the second input parasitic capacitance compensation circuit 16. Figures 5-1 to 5-29 The following are 29 specific implementation circuit diagrams of the first input parasitic capacitance compensation circuit 14 or the second input parasitic capacitance compensation circuit 16 in the Dougherty power amplifier provided in the embodiments of this application, which are described separately below.

[0117] Figure 5-1 In the first implementation shown, the first conductance compensation sub-circuit includes: a first inductor L101 connected in series with the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6, and the first susceptance compensation sub-circuit includes: at the end of the first inductor L101 away from the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6, a second inductor L102 connected in series, a first capacitor C101 and a first variable capacitor VC101 are pulled down to ground, and a first resistor R101 is pulled up between the first capacitor C101 and the first variable capacitor VC101.

[0118] Figure 5-2 In the second implementation shown, the first conductivity compensation sub-circuit includes a third inductor L103 connected in series with the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6, and the first susceptance compensation sub-circuit includes a third inductor L103 that is pulled down to ground at the end of the third inductor L103 away from the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6 via a fourth inductor L104 connected in series, a second capacitor C102 and a first variable resistor RH101, and a second resistor R102 that is pulled up between the second capacitor C102 and the first variable resistor RH101.

[0119] Figure 5-3 In the third implementation shown, the first conductance compensation sub-circuit includes a fifth inductor L105 connected in series with the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6, and the first susceptance compensation sub-circuit includes a fifth inductor L105 connected in series with a sixth inductor L106, a third capacitor C103 and a second variable resistor RH102 at the end of the fifth inductor L105 away from the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6, which is then pulled down to ground. A third resistor R103 is pulled up between the third capacitor C103 and the second variable resistor RH102, and a fourth capacitor C104 is connected in parallel with the second variable resistor RH102.

[0120] Figure 5-4 In the fourth implementation shown, the first conductance compensation sub-circuit includes a seventh inductor L107 connected in series with the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6, and the first susceptance compensation sub-circuit includes a seventh inductor L107 located away from the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6, which is pulled down to ground through an eighth inductor L108 connected in series and a first varactor diode VD101.

[0121] Figure 5-5In the fifth implementation shown, the first conductance compensation sub-circuit includes a ninth inductor L109 connected in series with the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6, and the first susceptance compensation sub-circuit includes a tenth inductor L110 connected in series with the tenth inductor L110 and a first transistor PNP101 at the end of the ninth inductor L109 away from the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6, and the input terminal of the first transistor PNP101 is connected to the power supply.

[0122] Figure 5-6 In the sixth implementation shown, the first conductance compensation sub-circuit includes an eleventh inductor L111 connected in series with the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6, and the first susceptance compensation sub-circuit includes a twelfth inductor L112 connected in series with the eleventh inductor L111 at the end away from the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6, which is then pulled down to ground via a second variable capacitor VC102.

[0123] Figure 5-7 In the seventh implementation shown, the first conductivity compensation sub-circuit includes a thirteenth inductor L113 connected in series with the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6, and the first susceptance compensation sub-circuit includes a second varactor diode VD102 pulling down to ground at the end of the thirteenth inductor L113 away from the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6.

[0124] Figure 5-8 In the eighth implementation shown, the first conductivity compensation sub-circuit includes: a fourteenth inductor L114 connected in series with the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6, and the first susceptance compensation sub-circuit includes: the end of the fourteenth inductor L114 away from the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6 is pulled down to ground through the second transistor PNP102;

[0125] Figure 5-9 In the ninth implementation shown, the first conductance compensation sub-circuit includes: a fifteenth inductor L115 connected in series with the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6, and the first susceptance compensation sub-circuit includes: the end of the fifteenth inductor L115 away from the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6 is pulled down to ground through a third variable capacitor VC103.

[0126] Figure 5-10In the 10th implementation shown, the first conductivity compensation sub-circuit includes: connecting the sixteenth inductor L116 and the seventeenth inductor L117 in series at the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6; and the first susceptance compensation sub-circuit includes: pulling down the sixteenth inductor L116 and the seventeenth inductor L117 through the eighteenth inductor L118, the fifth capacitor C105 and the fourth variable capacitor VC104 in series to ground, and pulling up the fifth capacitor C105 and the fourth variable capacitor VC104 through the fourth resistor R104.

[0127] Figure 5-11 In the 11th implementation shown, the first conductivity compensation sub-circuit includes: connecting the nineteenth inductor L119 and the twentieth inductor L120 in series at the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier 6; and the first susceptance compensation sub-circuit includes: pulling down the nineteenth inductor L119 and the twentieth inductor L120 to ground via the twenty-first inductor L121, the sixth capacitor C106 and the third variable resistor RH103 connected in series, and pulling up the sixth capacitor C106 and the third variable resistor RH103 via the fifth resistor R105.

[0128] Figure 5-12 In the 12th implementation shown, the first conductance compensation sub-circuit includes: connecting the 22nd inductor L122 and the 23rd inductor L123 in series at the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6; and the first susceptance compensation sub-circuit includes: pulling down to ground between the 22nd inductor L122 and the 23rd inductor L123 via the 24th inductor L124, the 7th capacitor C107 and the 4th variable resistor RH104 in series; pulling up to the 7th capacitor C107 and the 4th variable resistor RH104 via the 6th resistor R106; and connecting the 4th variable resistor RH104 in parallel with the 8th capacitor C108.

[0129] Figure 5-13 In the 13th implementation shown, the first conductivity compensation sub-circuit includes: connecting the 25th inductor L125 and the 26th inductor L126 in series at the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6, and the first susceptance compensation sub-circuit includes: pulling down to ground between the 25th inductor L125 and the 26th inductor L126 through the 27th inductor L127 and the third varactor diode VD101 connected in series.

[0130] Figure 5-14In the 14th implementation shown, the first conductivity compensation sub-circuit includes: connecting the 28th inductor L128 and the 29th inductor L129 in series at the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6, and the first susceptance compensation sub-circuit includes: pulling down to ground between the 28th inductor L128 and the 29th inductor L129 through the 30th inductor L130 and the third transistor PNP103 in series.

[0131] Figure 5-15 In the 15th implementation shown, the first conductance compensation sub-circuit includes: connecting the 31st inductor L131 and the 32nd inductor L132 in series at the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6, and the first susceptance compensation sub-circuit includes: pulling down to ground between the 31st inductor L131 and the 32nd inductor L132 through the 33rd inductor L133 in series and the fifth variable capacitor VC105.

[0132] Figure 5-16 In the 16th implementation shown, the first conductivity compensation sub-circuit includes: a 34th inductor L134 and a 9th capacitor C109 connected in series at the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6; and the first susceptance compensation sub-circuit includes: a 35th inductor L135, a 10th capacitor C110 and a 6th variable capacitor VC106 connected in series between the 34th inductor L134 and the 9th capacitor C109, which are pulled down to ground; and a 7th resistor R107 is pulled up between the 10th capacitor C110 and the 6th variable capacitor VC106.

[0133] Figure 5-17 In the 17th implementation shown, the first conductivity compensation sub-circuit includes: a 36th inductor L136 and an 11th capacitor C110 connected in series at the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6; and the first susceptance compensation sub-circuit includes: a 37th inductor L137, a 12th capacitor C112 and a 5th variable resistor RH105 connected in series between the 36th inductor L136 and the 11th capacitor C110, which are then pulled down to ground; and an 8th resistor R108 is pulled up between the 12th capacitor C112 and the 5th variable resistor RH105.

[0134] Figure 5-18In the 18th implementation shown, the first conductance compensation sub-circuit includes: a 38th inductor L138 and a 13th capacitor C113 connected in series at the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6; and the first susceptance compensation sub-circuit includes: a 39th inductor L139, a 14th capacitor C114 and a 6th variable resistor RH106 connected in series between the 38th inductor L138 and the 13th capacitor C113, which are then grounded; a 9th resistor R109 is pulled up between the 14th capacitor C114 and the 6th variable resistor RH106; and a 15th capacitor C115 is connected in parallel with the 6th variable resistor RH106.

[0135] Figure 5-19 In the 19th implementation shown, the first conductivity compensation sub-circuit includes: a 40th inductor L140 and a 16th capacitor C116 connected in series at the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6, and the first susceptance compensation sub-circuit includes: a 41st inductor L141 and a 4th varactor diode VD104 connected in series between the 40th inductor L140 and the 16th capacitor C116 and grounded.

[0136] Figure 5-20 In the 20th implementation shown, the first conductance compensation sub-circuit includes: connecting the forty-second inductor L142 and the seventeenth capacitor C117 in series at the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6, and the first susceptance compensation sub-circuit includes: connecting the forty-third inductor L143 and the fourth transistor PNP103 in series between the forty-second inductor L142 and the seventeenth capacitor C117 to ground.

[0137] Figure 5-21 In the 21st implementation shown, the first conductivity compensation sub-circuit includes: a forty-fourth inductor L144 and an eighteenth capacitor C118 connected in series at the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6, and the first susceptance compensation sub-circuit includes: a forty-fifth inductor L145 and a seventh variable capacitor VC107 connected in series between the forty-fourth inductor L144 and the eighteenth capacitor C118 and grounded.

[0138] Figure 5-22 In the 22nd implementation shown, the first conductivity compensation sub-circuit includes: connecting the forty-sixth inductor L146 and the forty-seventh inductor L147 in series at the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6, and the first susceptance compensation sub-circuit includes: pulling down to ground between the forty-sixth inductor L146 and the forty-seventh inductor L147 through the nineteenth capacitor C119 and the eighth variable capacitor VC108 in series, and pulling up the tenth resistor R110 between the nineteenth capacitor C119 and the eighth variable capacitor VC108.

[0139] Figure 5-23 In the 23rd implementation shown, the first conductivity compensation sub-circuit includes: connecting the forty-eighth inductor L148 and the forty-ninth inductor L149 in series at the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6, and the first susceptance compensation sub-circuit includes: pulling down the forty-eighth inductor L148 and the forty-ninth inductor L149 to ground through the twentieth capacitor C120 and the seventh variable resistor RH107 in series, and pulling up the eleventh resistor R111 between the twentieth capacitor C120 and the seventh variable resistor RH107.

[0140] Figure 5-24 In the 24th implementation shown, the first conductivity compensation sub-circuit includes: connecting the fiftieth inductor L150 and the fifty-first inductor L151 in series at the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6; and the first susceptance compensation sub-circuit includes: pulling down to ground between the fiftieth inductor L150 and the fifty-first inductor L151 through the twenty-first capacitor C121 and the eighth variable resistor RH108 in series; pulling up the twelfth resistor R112 between the twenty-first capacitor C121 and the eighth variable resistor RH108; and connecting the eighth variable resistor RH108 in parallel with the twenty-second capacitor C122.

[0141] Figure 5-25 In the 25th implementation shown, the first conductivity compensation sub-circuit includes: connecting the 52nd inductor L152 and the 23rd capacitor C123 in series at the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6, and the first susceptance compensation sub-circuit includes: the 52nd inductor L152 and the 23rd capacitor C123 are pulled down to ground through the 5th varactor diode VD105.

[0142] Figure 5-26 In the 26th implementation shown, the first conductivity compensation sub-circuit includes: connecting the 53rd inductor L153 and the 24th capacitor C124 in series at the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6, and the first susceptance compensation sub-circuit includes: the 53rd inductor L153 and the 24th capacitor C124 are grounded through the 5th transistor PNP105.

[0143] Figure 5-27 In the 27th implementation shown, the first conductivity compensation sub-circuit includes: the 54th inductor L154 and the 25th capacitor C125 are connected in series at the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6, and the first susceptance compensation sub-circuit includes: the 54th inductor L154 and the 25th capacitor C125 are pulled down to ground through the 9th variable capacitor VC109.

[0144] Figure 5-28In the 28th implementation shown, the first conductance compensation sub-circuit includes: a first parallel inductor-capacitor sub-circuit LC101 and a second parallel inductor-capacitor sub-circuit LC102 connected in series at the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6; and the first susceptance compensation sub-circuit includes: a 55th inductor L155, a 26th capacitor C126 and a 10th variable capacitor VC110 connected in series between the first parallel inductor-capacitor sub-circuit LC101 and the second parallel inductor-capacitor sub-circuit LC102 pulled down to ground, and a 13th resistor R113 pulled up between the 26th capacitor C126 and the 10th variable capacitor VC110.

[0145] Figure 5-29 In the 29th implementation shown, the first conductivity compensation sub-circuit includes: the 56th inductor L156, the 27th capacitor C127, the 28th capacitor C128 and the 57th inductor L157 connected in series at the input terminal of the main power amplifier circuit 3 or the input terminal of the auxiliary power amplifier circuit 6; and the first susceptance compensation sub-circuit includes: the 27th capacitor C127 and the 28th capacitor C128 are connected in series through the third parallel inductor-capacitor sub-circuit LC103, the 29th capacitor C129 and the 11th variable capacitor VC111 pulled down to ground, and the 29th capacitor C129 and the 11th variable capacitor VC111 are connected up through the 14th resistor R114.

[0146] In this embodiment, the second conductance compensation sub-circuit is connected in series to the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6, and includes at least one of the following structures: an inductor; two inductors connected in series; a capacitor and an inductor connected in series; a series-connected parallel capacitor-inductor sub-circuit; and a series-connected two capacitor-inductor sub-circuit.

[0147] In this embodiment, the second susceptance compensation sub-circuit is connected to the end of the second conductance compensation sub-circuit that is furthest from the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6; or, it is connected between two components in the second conductance compensation sub-circuit to pull down the second susceptance compensation sub-circuit.

[0148] The second susceptance compensation sub-circuit includes at least one of the following structures:

[0149] Pull-down via an inductor, a capacitor, and a variable capacitor connected in series, with a resistor pulled up between the capacitor and the variable capacitor; pull-down via an inductor, a capacitor, and a variable resistor connected in series, with a resistor pulled up between the capacitor and the variable resistor; pull-down via an inductor, a capacitor, and a variable resistor connected in series, with a resistor pulled up between the capacitor and the variable resistor, and a capacitor connected in parallel between the capacitor and the variable resistor; pull-down via an inductor and a varactor diode connected in series; pull-down via an inductor and a transistor connected in series; pull-down via an inductor and a variable capacitor connected in series; pull-down via a variable capacitor... Pull-down via a capacitor, diode, transistor, or variable capacitor; pull-down via a series capacitor and a variable capacitor, with a pull-up resistor between the capacitor and the variable capacitor; pull-down via a series capacitor and a variable resistor, with a pull-up resistor between the capacitor and the variable resistor; pull-down via a series capacitor and a variable resistor, with a pull-up resistor between the capacitor and the variable resistor, and a capacitor in parallel between the capacitor and the variable resistor; and pull-down via a series parallel capacitor-inductor sub-circuit and a variable capacitor, with a pull-up resistor between the capacitor and the variable capacitor.

[0150] In practice, there are 29 ways to implement the first output parasitic capacitance compensation circuit 15 or the second output parasitic capacitance compensation circuit 16. Figures 6-1 to 6-29 The following are schematic diagrams of 29 specific implementations of the first output parasitic capacitance compensation circuit 15 or the second output parasitic capacitance compensation circuit 17 in the Dougherty power amplifier provided in the embodiments of this application, which are described separately below.

[0151] Figure 6-1 In the first implementation shown, the second conductivity compensation sub-circuit includes an inductor L201 connected in series with the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6, and the second susceptance compensation sub-circuit includes a pull-down resistor R201 between the end of the inductor L201 away from the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6 and the end of the inductor L201 connected in series with an inductor L202, a capacitor C201 and a variable capacitor VC201, and the end of the inductor L201 away from the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6.

[0152] Figure 6-2 In the second implementation shown, the second conductivity compensation sub-circuit includes an inductor L203 connected in series with the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6, and the second susceptance compensation sub-circuit includes a pull-down resistor R202 between the end of the inductor L203 away from the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6 and the end of the inductor L203 away from the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6.

[0153] Figure 6-3 In the third implementation shown, the second conductivity compensation sub-circuit includes an inductor L205 connected in series with the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6, and the second susceptance compensation sub-circuit includes a pull-down circuit at the end of the inductor L205 away from the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6, which is connected to ground via an inductor L206, a capacitor C203 and a variable resistor RH202 connected in series, a pull-up resistor R203 between the capacitor C203 and the variable resistor RH202, and a capacitor C204 connected in parallel with the variable resistor RH202.

[0154] Figure 6-4 In the fourth implementation shown, the second conductivity compensation sub-circuit includes: an inductor L207 and an inductor L208 connected in series at the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6, and the second susceptance compensation sub-circuit includes: an inductor L209, a capacitor C205 and a variable capacitor VC202 connected in series between the inductor L207 and the inductor L208, which are pulled down to ground, and a pull-up resistor R204 between the capacitor C205 and the variable capacitor VC202.

[0155] Figure 6-5 In the fifth implementation shown, the second conductivity compensation sub-circuit includes: an inductor L210 and an inductor L211 connected in series at the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6, and the second susceptance compensation sub-circuit includes: an inductor L212, a capacitor C206 and a variable resistor RH203 connected in series between the inductor L210 and the inductor L211, which are then pulled down to ground, and a pull-up resistor R205 is connected between the capacitor C206 and the variable resistor RH203.

[0156] Figure 6-6 In the sixth implementation shown, the second conductivity compensation sub-circuit includes: an inductor L213 and an inductor L214 connected in series at the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6, and the second susceptance compensation sub-circuit includes: an inductor L215, a capacitor C207 and a variable resistor RH204 connected in series between the inductor L213 and the inductor L214, a pull-up resistor R206 between the capacitor C207 and the variable resistor RH204, and a capacitor C208 connected in parallel with the variable resistor RH204.

[0157] Figure 6-7 In the seventh implementation shown, the second conductivity compensation sub-circuit includes an inductor L216 connected in series with the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6, and the second susceptance compensation sub-circuit includes a pull-down to ground at the end of the inductor L216 away from the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6 via an inductor L217 connected in series and a varactor diode VD201.

[0158] Figure 6-8 In the eighth implementation shown, the second conductance compensation sub-circuit includes an inductor L218 connected in series with the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6, and the second susceptance compensation sub-circuit includes a pull-down grounding connection at the end of the inductor L218 away from the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6 via an inductor L219 connected in series and a transistor PNP201, wherein the input terminal of the transistor PNP201 is connected to a power supply.

[0159] Figure 6-9 In the ninth implementation shown, the second conductance compensation sub-circuit includes an inductor L220 connected in series with the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6, and the second susceptance compensation sub-circuit includes a pull-down to ground at the end of the inductor L220 that is away from the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6, through an inductor L221 connected in series and a variable capacitor VC203.

[0160] Figure 6-10 In the 10th implementation shown, the second conductivity compensation sub-circuit includes: inductor L222 and inductor L223 connected in series at the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6, and the second susceptance compensation sub-circuit includes: inductor L224 connected in series and varactor diode VD202 pulled down to ground between inductor L222 and inductor L223.

[0161] Figure 6-11 In the 11th implementation shown, the second conductivity compensation sub-circuit includes: inductors L225 and L226 connected in series at the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6, and the second susceptance compensation sub-circuit includes: an inductor L227 connected in series between inductors L225 and L226 and a transistor PNP202 pulled down to ground, with the input terminal of the transistor PNP202 connected to the power supply.

[0162] Figure 6-12 In the 12th implementation shown, the second conductivity compensation sub-circuit includes: inductors L228 and L229 connected in series at the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6, and the second susceptance compensation sub-circuit includes: an inductor L230 connected in series between inductors L228 and L229 and a variable capacitor VC204 pulled down to ground.

[0163] Figure 6-13In the 13th implementation shown, the second conductivity compensation sub-circuit includes: an inductor L231 and a capacitor C209 connected in series at the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6, and the second susceptance compensation sub-circuit includes: an inductor L232, a capacitor C210 and a variable capacitor VC205 connected in series between the inductor L231 and the capacitor C209 to ground, and a pull-up resistor R207 between the capacitor C210 and the variable capacitor VC205.

[0164] Figure 6-14 In the 14th implementation shown, the second conductivity compensation sub-circuit includes: an inductor L233 and a capacitor C211 connected in series at the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6, and the second susceptance compensation sub-circuit includes: an inductor L234, a capacitor C212 and a variable resistor RH205 connected in series between the inductor L233 and the capacitor C211, which are grounded, and a pull-up resistor R208 between the capacitor C212 and the variable resistor RH205.

[0165] Figure 6-15 In the 15th implementation shown, the second conductivity compensation sub-circuit includes: an inductor L235 and a capacitor C213 connected in series at the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6, and the second susceptance compensation sub-circuit includes: an inductor L236, a capacitor C214 and a variable resistor RH206 connected in series between the inductor L235 and the capacitor C213 to ground, a pull-up resistor R209 between the capacitor C214 and the variable resistor RH206, and a capacitor C215 connected in parallel with the variable resistor RH206.

[0166] Figure 6-16 In the 16th implementation shown, the second conductivity compensation sub-circuit includes: an inductor L237 and a capacitor C216 connected in series at the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6. The second susceptance compensation sub-circuit includes: an inductor L238 connected in series with the capacitor C216 and a varactor diode VD203 pulled down to ground.

[0167] Figure 6-17 In the 17th implementation shown, the second conductivity compensation sub-circuit includes: an inductor L239 and a capacitor C217 connected in series at the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6, and the second susceptance compensation sub-circuit includes: an inductor L240 connected in series between the inductor L239 and the capacitor C217 and a transistor PNP203 pulled down to ground, with the input terminal of the transistor PNP203 connected to the power supply.

[0168] Figure 6-18In the 18th implementation shown, the second conductivity compensation sub-circuit includes: an inductor L241 and a capacitor C218 connected in series at the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6, and the second susceptance compensation sub-circuit includes: an inductor L242 connected in series between the inductor L241 and the capacitor C218 and a variable capacitor VC206 pulled down to ground.

[0169] Figure 6-19 In the 19th implementation shown, the second conductivity compensation sub-circuit includes: an inductor L243 and an inductor L244 connected in series at the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6, and the second susceptance compensation sub-circuit includes: a capacitor C219 and a variable capacitor VC207 connected in series between the inductor L243 and the inductor L244 to ground, and a pull-up resistor R207 between the capacitor C219 and the variable capacitor VC207.

[0170] Figure 6-20 In the 20th implementation shown, the second conductivity compensation sub-circuit includes: an inductor L245 and an inductor L246 connected in series at the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6, and the second susceptance compensation sub-circuit includes: a capacitor C220 and a variable resistor RH207 connected in series between the inductor L245 and the inductor L246 to ground, and a pull-up resistor R208 between the capacitor C220 and the variable resistor RH207.

[0171] Figure 6-21 In the 21st implementation shown, the second conductivity compensation sub-circuit includes: inductors L247 and L248 connected in series at the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6, and the second susceptance compensation sub-circuit includes: a capacitor C221 and a variable resistor RH208 pulling down to ground between inductors L247 and L248, a pull-up resistor R209 between capacitor C221 and variable resistor RH208, and a capacitor C222 connected in parallel with variable resistor RH208.

[0172] Figure 6-22 In the 22nd implementation shown, the second conductivity compensation sub-circuit includes: an inductor L249 and a capacitor C223 connected in series at the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6, and the second susceptance compensation sub-circuit includes: a varactor diode VD204 pulling down the inductor L249 and the capacitor C223 to ground.

[0173] Figure 6-23In the 23rd implementation shown, the second conductivity compensation sub-circuit includes: an inductor L250 and a capacitor C224 connected in series at the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6, and the second susceptance compensation sub-circuit includes: a transistor PNP204 pulling down to ground between the inductor L250 and the capacitor C224, and the input terminal of the transistor PNP204 is connected to the power supply.

[0174] Figure 6-24 In the 24th implementation shown, the second conductivity compensation sub-circuit includes: an inductor L251 and a capacitor C225 connected in series at the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6, and the second susceptance compensation sub-circuit includes: a variable capacitor VC208 pulling down the inductor L251 and the capacitor C225 to ground.

[0175] Figure 6-25 In the 25th implementation shown, the second conductivity compensation sub-circuit includes: an inductor L252 connected in series at the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6, and the second susceptance compensation sub-circuit includes: the end of the inductor L252 away from the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6 is pulled down to ground via a varactor diode VD205.

[0176] Figure 6-26 In the 26th implementation shown, the second conductivity compensation sub-circuit includes: an inductor L253 connected in series at the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6, and the second susceptance compensation sub-circuit includes: a transistor PNP204 pulling down the inductor L253 to ground at the end of the inductor L253 away from the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6, and the input terminal of the transistor PNP205 is connected to the power supply.

[0177] Figure 6-27 In the 24th implementation shown, the second conductivity compensation sub-circuit includes: an inductor L254 connected in series at the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6, and the second susceptance compensation sub-circuit includes: the end of the inductor L254 away from the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6 is pulled down to ground via a variable capacitor VC209.

[0178] Figure 6-28In the 28th implementation shown, the second conductance compensation sub-circuit includes: a parallel inductor-capacitor sub-circuit LC201 and a parallel inductor-capacitor sub-circuit LC202 connected in series at the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6; and the second susceptance compensation sub-circuit includes: a parallel inductor-capacitor sub-circuit LC201 and a parallel inductor-capacitor sub-circuit LC202 connected in series with an inductor L255, a capacitor C226 and a variable capacitor VC210, and a pull-up resistor R210 between the capacitor C226 and the variable capacitor VC210.

[0179] Figure 6-29 In the 29th implementation shown, the second conductivity compensation sub-circuit includes: an inductor L256, a capacitor C227, a capacitor C228 and an inductor L257 connected in series at the output terminal of the main power amplifier circuit 3 or the output terminal of the auxiliary power amplifier circuit 6; and the second susceptance compensation sub-circuit includes: a parallel inductor-capacitor sub-circuit LC203 connected in series between capacitor C227 and capacitor C228, a capacitor C229 and a variable capacitor VC211 pulled down to ground, and a pull-up resistor R211 between capacitor C229 and variable capacitor VC211.

[0180] In the embodiments of this application, Figure 5-1 The structure shown and Figure 6-1 The structure shown is applied in Figure 4 In the middle, one can obtain such as Figure 7 The diagram shows a specific implementation of the Dougherty power amplifier.

[0181] In the embodiments of this application, Figure 3 The structure of Example 1 of the Dougherty power amplifier shown is one implementation of the Dougherty power amplifier. The structure of the Dougherty power amplifier can be varied, and the aforementioned compensation circuit can be added to these variations.

[0182] Figure 8 This is a schematic diagram of Example 3 of the structure of the Dougherty power amplifier provided in the embodiments of this application, and... Figure 4 or Figure 7 In contrast, its synthesis circuit 8 has a different connection method. Its second phase adjustment circuit 81 is used to adjust the phase of the main signal after output impedance matching to align with the phase of the auxiliary signal after output impedance matching. Here, the phase adjustment of the main signal after output impedance matching can be delayed by 90 degrees. The auxiliary signal (i.e., the phase-aligned signal) and the phase-aligned main signal (i.e., the adjusted signal) are input to the back-end impedance circuit 9 through the same node and output through the back-end impedance circuit 9. The phase-aligned signal and the adjusted signal are superimposed at the node to synthesize the signal.

[0183] Figure 9Example four structural schematic diagrams of the Dougherty power amplifier provided in the embodiments of this application are shown. Figure 4 or Figure 7 In comparison, the structure of its synthesis circuit 8 is different. Figure 9 The synthesis circuit 8 includes an impedance transformer and a phase compensation line element. The phase compensation line element is used to adjust the phase of the auxiliary signal after output impedance matching to align with the phase of the main signal after output impedance matching. The impedance transformer is used to perform impedance transformation on the phase-adjusted auxiliary signal. In practical applications, the positions of the phase compensation line element and the impedance transformer can be interchanged, so that the impedance transformer can be used to perform impedance transformation on the adjusted auxiliary signal. The main signal (i.e., the phase-aligned signal) and the phase-aligned auxiliary signal (i.e., the adjusted signal) are output through the back-end impedance circuit 9, wherein the phase-aligned signal and the adjusted signal are superimposed at the node to synthesize the signal.

[0184] Figure 10 Example five structural schematic diagram of the Dougherty power amplifier provided in the embodiments of this application, and Figure 4 or Figure 7 In comparison, the structure of its synthesis circuit 8 is different. Figure 10 The synthesis circuit 8 shown includes an impedance transformer and a phase compensation line element. The phase compensation line element is used to adjust the phase of the main signal after output impedance matching to align with the phase of the auxiliary signal after output impedance matching. Here, the phase adjustment of the main signal after output impedance matching can be delayed by 90 degrees. The impedance transformer is used to perform impedance transformation on the main signal before phase adjustment. In practical applications, the positions of the phase compensation line element and the impedance transformer can be interchanged, so that the impedance transformer can be used to perform impedance transformation on the phase-adjusted main signal. The auxiliary signal (i.e., the phase-aligned signal) and the phase-aligned main signal (i.e., the adjusted signal) are input to the back-end impedance circuit 9 through the same node and output through the back-end impedance circuit 9. The phase-aligned signal and the adjusted signal are superimposed at the node to synthesize the signal.

[0185] Those skilled in the art will understand that the features described in the various embodiments and / or claims of this disclosure can be combined and / or combined in various ways, even if such combinations or combinations are not explicitly described in this application. In particular, without departing from the spirit and teachings of this application, the features described in the various embodiments and / or claims of this application can be combined and / or combined in various ways, and all such combinations and / or combinations fall within the scope of this application.

[0186] This document uses specific embodiments to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the methods and core ideas of this application, and are not intended to limit this application. For those skilled in the art, changes can be made to the specific implementation methods and application scope based on the ideas, spirit and principles of this application. Any modifications, equivalent substitutions, improvements, etc., made should be included within the scope of protection of this application.

Claims

1. A Dougherty power amplifier, comprising: The input signal is divided into a main signal and an auxiliary signal by the signal distribution circuit (1), and then transmitted to the main road and the auxiliary road respectively. In the main circuit, the main circuit signal is transmitted to the synthesis circuit (8) after being matched by the input impedance of the main input matching circuit (2), amplified by the main power amplifier circuit (3), and matched by the output impedance of the main output matching circuit (4); in the auxiliary circuit, the auxiliary circuit signal is transmitted to the synthesis circuit (8) after being matched by the input impedance of the auxiliary input matching circuit (5), amplified by the auxiliary power amplifier circuit (6), and matched by the output impedance of the auxiliary output matching circuit (7); the synthesis circuit (8) synthesizes the processed main circuit signal and the auxiliary circuit signal and outputs them. Its characteristic is that it further includes: A first input parasitic capacitance compensation circuit (14) is connected in series to the input terminal of the main power amplifier circuit (3) to compensate for the admittance change caused by the input parasitic capacitance of the main power amplifier circuit (3) in the main circuit. A first output parasitic capacitance compensation circuit (15) is connected in series to the output terminal of the main power amplifier circuit (3) to compensate for the admittance change caused by the output parasitic capacitance of the main power amplifier circuit (3) in the main circuit. A second input parasitic capacitance compensation circuit (16) connected in series at the input terminal of the auxiliary power amplifier circuit (6) to compensate for the admittance change caused by the input parasitic capacitance of the auxiliary power amplifier circuit (6) in the auxiliary circuit; and, A second output parasitic capacitance compensation circuit (17) is connected in series to the output terminal of the auxiliary power amplifier circuit (6) to compensate for the admittance change caused by the output parasitic capacitance of the auxiliary power amplifier circuit (6) in the auxiliary circuit. The first input parasitic capacitance compensation circuit (14) or the second input parasitic capacitance compensation circuit (16) includes: a first conductance compensation sub-circuit and a first susceptance compensation sub-circuit. in, The first conductance compensation sub-circuit includes at least one inductor, or includes at least one inductor and at least one capacitor connected in series or parallel, to compensate for the conductance of the input parasitic capacitance of the main power amplifier circuit (3) in the admittance generated in the main circuit, or to compensate for the conductance of the input parasitic capacitance of the auxiliary power amplifier circuit (6) in the admittance generated in the auxiliary circuit. The first susceptance compensation sub-circuit includes at least one variable capacitor equivalent element to compensate for the susceptance in the admittance generated by the input parasitic capacitance of the main power amplifier circuit (3) in the main circuit, or to compensate for the susceptance in the admittance generated by the input parasitic capacitance of the auxiliary power amplifier circuit (6) in the auxiliary circuit.

2. The Dougherty power amplifier as described in claim 1, characterized in that, The second output parasitic capacitance compensation circuit (17) also adjusts the open-circuit characteristics of the auxiliary circuit during the power back-off process of the Dougherty power amplifier.

3. The Dougherty power amplifier as described in claim 1, characterized in that, The first output parasitic capacitance compensation circuit (15) or the second output parasitic capacitance compensation circuit (17) includes: a second conductance compensation sub-circuit and a second susceptance compensation sub-circuit, wherein, The second conductance compensation sub-circuit includes at least one inductor, or includes at least one inductor and at least one capacitor connected in series or parallel, to compensate for the conductance of the parasitic capacitance of the main power amplifier circuit (3) in the admittance generated in the main circuit, or to compensate for the conductance of the parasitic capacitance of the auxiliary power amplifier circuit (6) in the admittance generated in the auxiliary circuit. The second susceptance compensation sub-circuit includes at least one variable capacitor equivalent element to compensate for the susceptance in the admittance generated by the parasitic capacitance of the main power amplifier circuit (3) in the main circuit, or to compensate for the susceptance in the admittance generated by the parasitic capacitance of the auxiliary power amplifier circuit (6) in the auxiliary circuit.

4. The Dougherty power amplifier as described in claim 1, characterized in that, The first conductivity compensation sub-circuit is connected in series to the input terminal of the main power amplifier circuit (3) or the input terminal of the auxiliary power amplifier circuit (6), and includes at least one of the following structures: One inductor; Two inductors connected in series; A capacitor and an inductor connected in series; A series-connected sub-circuit with two parallel capacitors and inductors; And, a series-connected sub-circuit of two capacitors and inductors.

5. The Dougherty power amplifier as described in claim 3, characterized in that, The first susceptance compensation sub-circuit is connected to the end of the first conductance compensation sub-circuit that is furthest from the input terminal of the main power amplifier circuit (3) or the input terminal of the auxiliary power amplifier circuit (6), or it is connected between two components in the first conductance compensation sub-circuit to pull down the first susceptance compensation sub-circuit; the first susceptance compensation sub-circuit includes at least one of the following structures: A pull-down resistor is connected in series with an inductor, a capacitor, and a variable capacitor, and a pull-up resistor is connected between the capacitor and the variable capacitor. The circuit is connected in series with an inductor, a capacitor, and a variable resistor, and then pulled down. A resistor is then pulled up between the capacitor and the variable resistor. The circuit is connected in series with an inductor, a capacitor, and a variable resistor, then pulled down, and a resistor is pulled up between the capacitor and the variable resistor, and a capacitor is connected in parallel between the capacitor and the variable resistor. The circuit is pulled down through a series inductor and a varactor diode; The circuit is pulled down through a series inductor and a transistor; The circuit is pulled down through an inductor and a variable capacitor connected in series; Pull-down via a varactor diode, a transistor, or a variable capacitor; A capacitor and a variable capacitor are connected in series and then pulled down, and a resistor is pulled up between the capacitor and the variable capacitor; A capacitor and a variable resistor are connected in series and then pulled down, and a resistor is pulled up between the capacitor and the variable resistor; A capacitor and a variable resistor are connected in series and then pulled down, and a resistor is pulled up between the capacitor and the variable resistor, and a capacitor is connected in parallel between the capacitor and the variable resistor; The circuit is connected in series with a parallel capacitor and an inductor sub-circuit and a variable capacitor, then pulled down, and a resistor is pulled up between the capacitor and the variable capacitor.

6. The Dougherty power amplifier as described in claim 3, characterized in that, The second conductivity compensation sub-circuit is connected in series to the output terminal of the main power amplifier circuit (3) or the output terminal of the auxiliary power amplifier circuit (6), and includes at least one of the following structures: One inductor; Two inductors connected in series; A capacitor and an inductor connected in series; A series-connected sub-circuit with two parallel capacitors and inductors; And a series-connected sub-circuit of two capacitors and inductors.

7. The Dougherty power amplifier as described in claim 3, characterized in that, The second susceptance compensation sub-circuit is connected to the end of the second conductance compensation sub-circuit that is furthest from the output terminal of the main power amplifier circuit (3) or the output terminal of the auxiliary power amplifier circuit (6); or it is connected between two components in the second conductance compensation sub-circuit to pull down the second susceptance compensation sub-circuit; the second susceptance compensation sub-circuit includes at least one of the following structures: A pull-down resistor is connected in series with an inductor, a capacitor, and a variable capacitor, and a pull-up resistor is connected between the capacitor and the variable capacitor. The circuit is connected in series with an inductor, a capacitor, and a variable resistor, and then pulled down. A resistor is then pulled up between the capacitor and the variable resistor. The circuit is connected in series with an inductor, a capacitor, and a variable resistor, then pulled down, and a resistor is pulled up between the capacitor and the variable resistor, and a capacitor is connected in parallel between the capacitor and the variable resistor. The circuit is pulled down through a series inductor and a varactor diode; The circuit is pulled down through a series inductor and a transistor; The circuit is pulled down through an inductor and a variable capacitor connected in series; Pull-down via a varactor diode, a transistor, or a variable capacitor; A capacitor and a variable capacitor are connected in series and then pulled down, and a resistor is pulled up between the capacitor and the variable capacitor; A capacitor and a variable resistor are connected in series and then pulled down, and a resistor is pulled up between the capacitor and the variable resistor; A capacitor and a variable resistor are connected in series and then pulled down, and a resistor is pulled up between the capacitor and the variable resistor, and a capacitor is connected in parallel between the capacitor and the variable resistor; Additionally, a pull-down circuit is formed by a series parallel capacitor-inductor sub-circuit and a variable capacitor, and a pull-up resistor is formed between the capacitor and the variable capacitor.

8. The Dougherty power amplifier as described in any one of claims 1-7, characterized in that, The synthesis circuit (8) includes: a phase adjustment circuit that adjusts the phase of the auxiliary signal after output impedance matching to be aligned with the phase of the main signal after output impedance matching; Alternatively, the phase of the main signal, which has undergone output impedance matching, can be adjusted to align with the phase of the auxiliary signal, which has undergone output impedance matching. The regulated signal and the phase-aligned signal are output through the same node.

9. The Dougherty power amplifier as described in any one of claims 1-7, characterized in that, The synthesis circuit (8) includes: a phase compensation line element for adjusting the phase of the auxiliary signal after output impedance matching to align with the phase of the main signal after output impedance matching; or, for adjusting the phase of the main signal after output impedance matching to align with the phase of the auxiliary signal after output impedance matching. An impedance transformer is used to transform the impedance of a signal before or after phase adjustment; the adjusted signal and the phase-aligned signal are output through the same node.

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