WO2019015679A1

WO2019015679A1 - Radio frequency signal linearisation processing circuit and method

Info

Publication number: WO2019015679A1
Application number: PCT/CN2018/096517
Authority: WO
Inventors: 安晋元; 张璠; 王刚; 崔晓俊; 侯婷; 陈化璋
Original assignee: 中兴通讯股份有限公司
Priority date: 2017-07-21
Filing date: 2018-07-20
Publication date: 2019-01-24
Also published as: CN109286377A

Abstract

Disclosed are a radio frequency signal linearisation processing circuit and method. The linearisation processing circuit comprises a pre-distortion device and a power amplification circuit connected to the pre-distortion device. The power amplification circuit comprises a plurality of amplification sub-circuits, each amplification sub-circuit comprising an interconnected power distribution apparatus, amplifier, and state adjustment line provided with a coupling network, the coupling network of each amplification sub-circuit being connected to the pre-distortion device by means of a corresponding attenuated phase shift network. The pre-distortion device comprises a plurality of input interfaces and an output interface, the plurality of input interfaces respectively being used for receiving radio frequency input signals and the coupling signals transmitted by each attenuated phase shift network, and the output interface being used for transmitting the coupling signals and the radio frequency input signals to the power amplification circuit.

Description

Linearization processing circuit and method for radio frequency signal

Technical field

The present disclosure relates to, but is not limited to, the field of radio frequency power amplifiers.

Background technique

With the development of communication technology, operators have higher and higher requirements for compatibility of communication systems, especially in broadband mixed mode scenarios, which need to support multiple modes at the same time, including but not limited to GSM (Global System for Mobile Communication). System), CDMA (Code Division Multiple Access), UMTS (Universal Mobile Telecommunications System), LTE (Long Term Evolution), etc., which require high linearization of power amplifiers. Therefore, the linearization technology adopted needs to be further improved.

Summary of the invention

Embodiments of the present disclosure provide a linearization processing circuit for a radio frequency signal, including a predistorter and a power amplifying circuit connected to an output of the predistorter. The power amplifying circuit comprises a plurality of sub-amplifying circuits, each sub-amplifying circuit comprising interconnected power distribution devices, amplifiers and state adjustment lines provided with a coupling network, the coupling network of each sub-amplifying circuit being connected to the pre-distortion via a corresponding attenuation phase-shifting network Device. The predistorter includes a plurality of input interfaces and an output interface, the plurality of input interfaces respectively for receiving RF input signals, and respective coupled signals transmitted by the respective attenuation phase shifting networks, the output interfaces for respectively coupling the respective signals The radio frequency input signal is transmitted to the power amplifying circuit.

Embodiments of the present disclosure also provide a linearization processing method for a radio frequency signal, which is applied to a linearization processing circuit of a radio frequency signal, the linearization processing circuit including a predistorter and power amplification connected to an output end of the predistorter a circuit, the power amplifying circuit comprising a plurality of sub-amplifying circuits, each sub-amplifying circuit comprising interconnected power distribution devices, amplifiers and state adjustment lines provided with a coupling network, the coupling network of each sub-amplifying circuit via a corresponding attenuation phase shifting network Connecting to the predistorter, the method comprising: transmitting the radio frequency input signal to the power amplifying circuit when receiving a radio frequency input signal through the predistorter; The RF input signals are respectively transmitted to the respective sub-amplifier circuits, and are coupled in a coupling network of the respective sub-amplifier circuits to obtain respective coupled signals; and each of the obtained coupled signals is respectively passed through an attenuation phase-shifting network connected to each of the sub-amplifier circuits. Returning to the predistorter; and utilizing the warp in the predistorter Each of the signals returned by the attenuated phase shifting network processes the radio frequency input signal to obtain a linearized radio frequency signal.

DRAWINGS

The drawings described herein are provided to provide a further understanding of the present disclosure, and are intended to be a part of the present disclosure. In the drawing:

1 is a schematic diagram for explaining the principle of digital predistortion;

2 is a schematic structural diagram of a digital predistortion application in the related art;

3 is a schematic structural diagram of a linearization processing circuit of a radio frequency signal according to an embodiment of the present disclosure;

4 is a block diagram showing a structure of a coupler applicable to a linearization processing circuit of a radio frequency signal according to an embodiment of the present disclosure;

FIG. 5 is a schematic structural diagram of a linearization processing circuit of a radio frequency signal according to another embodiment of the present disclosure; FIG.

6 shows a schematic structural diagram of an attenuator applicable to a linearization processing circuit of a radio frequency signal according to an embodiment of the present disclosure;

7 is a block diagram showing a structure of a phase shifter applicable to a linearization processing circuit of a radio frequency signal according to an embodiment of the present disclosure;

8 is a schematic diagram of superposition of main circuit and auxiliary path distortion curves in the related art;

9 is a schematic diagram showing the respective distortions of the main path and the auxiliary path in the related art;

10 is a flow chart showing a method of linearizing a radio frequency signal according to an embodiment of the present disclosure;

FIG. 11 is a schematic flow chart of a method for linearizing a radio frequency signal according to another embodiment of the present disclosure.

Detailed ways

It is understood that the specific embodiments described herein are merely illustrative of the disclosure and are not intended to limit the disclosure.

Commonly used linearization techniques include power back-off, feedforward, and pre-distortion.

The power backoff technique (ie, the industry's collective high power amplifier design technique) utilizes a large amount of power backoff from a 1 dB compression point (P _{1 dB} ) to operate the power amplifier within the power dynamics of the linear segment. This technology relies entirely on the performance of the amplifier tube to ensure the linearity of the power amplifier, suitable for low power (generally will not exceed 50W) and linear requirements are not high (such as single carrier frequency CDMA signal power amplification), for large Power and high linearity requirements (such as multi-carrier CDMA and WCDMA (Wideband Code Division Multiple Access) signal amplification) can not be used.

The feedforward technique utilizes two signal cancellation loops to cancel the nonlinear distortion products in the output signal of the power amplifier to achieve linearization of the power amplifier circuit, and achieves a linear amplification index that fully satisfies the system requirements. This technology has the advantages of linearized processing bandwidth (up to 30MHz), high linearity improvement index (up to 25dB), and easy design and implementation of technology. However, due to the relatively complicated structure, this technology is also difficult to grasp production consistency. And the disadvantage of higher cost.

Digital predistortion technology is a mainstream RF power amplifier linearization technology in recent years, which can overcome the shortcomings of the above two technologies. The digital predistortion technology relies on inserting a nonlinear transmission link in the input channel, that is, a predistorter, and using the nonlinear characteristic of the predistorter and the power amplifier circuit to cancel the nonlinear product of the power amplifier to realize the linearization of the power amplifier. index. However, since the power amplifier needs to support an increasingly complex wideband mixed-mode system, it is difficult to meet the linearity index in the mixed-mode scene using conventional digital pre-distortion, so it is necessary to design with a larger or more power amplifier tube, resulting in the power amplifier due to the power amplifier. To support the mixed mode, the sacrifice is made in terms of efficiency, and the heat dissipation of the whole machine cannot meet the requirements. The size of the heat sink can be increased to improve the heat dissipation, thereby increasing the cost.

The digital predistortion technology couples the signal output from the power amplifier, obtains the coupled signal and inputs it into the predistorter. After the predistortion algorithm, the relevant predistortion component is introduced into the input signal, and then superimposed on the output signal of the power amplifier at the output end.

FIG. 1 is a schematic diagram for explaining the principle of digital predistortion. Referring to FIG. 1, the linear characteristic curve shown by line 2 can be obtained by using the nonlinear characteristic curve of the predistorter shown in line 1 to correct the nonlinear characteristic curve of the power amplifier shown by line 3.

In order to better understand the digital pre-distortion technology, the digital pre-distortion technology is explained by taking the two-way power amplifier in the related art as an example. 2 is a schematic structural diagram of a digital predistortion application in the related art.

As shown in Figure 2, the main power amplifier (Main Amplifier) works in class B or class AB, and the auxiliary power amplifier (Peak Amplifier) works in class C. The two amplifiers do not work in turn, but the main power amplifier works all the time, and the auxiliary power amplifier works until the set signal peak.

The main power amplifier is provided with a high-resistance state adjustment line and a 35-ohm variable resistance line. The purpose is to reduce the apparent impedance of the main power amplifier tube when the auxiliary power amplifier is not working, to ensure the auxiliary power amplifier working and the following circuit components. The active load impedance becomes lower, so that the main amplifier output current becomes larger. Since the main power amplifier has a quarter-wavelength line behind it, in order to make the two power amplifier outputs in phase, a phase adjustment line needs to be set in front of the auxiliary power amplifier.

An open circuit state adjustment line is arranged behind the auxiliary power amplifier tube to ensure that the auxiliary power amplifier tube can exhibit an open state at the junction point when not working, thereby reducing the performance impact on the main power amplifier tube.

When using digital predistortion technology, a coupling network is generally added at the output of the amplifying circuit to achieve power coupling, and the attenuation network is connected at the coupling port to adjust to an appropriate size. The coupled signal is transmitted to the predistorter for processing. The predistorter is processed as an input signal to the power amplifier to form an adaptive closed loop that allows the amplifier circuit to achieve optimum linearity.

As can be seen from Figure 2, the auxiliary power is only set to work at the peak of the set signal, and since the power amplifier needs to support an increasingly complex wideband mixed mode, it is difficult to meet the linearity index in the mixed mode scenario using conventional digital predistortion. Therefore, it is necessary to use a larger or more power amplifier tube, which leads to a greater sacrifice in efficiency, and the heat dissipation of the whole machine cannot meet the requirements. The heat dissipation performance can be improved only by increasing the size of the heat sink, or at a high temperature. The use of the scene is reduced, which weakens the competitiveness of the whole machine.

The technical solution of the embodiments of the present disclosure is mainly: amplifying and coupling the radio frequency input signals through the respective sub-amplifying circuits of the power amplifying circuit, and then transmitting the respective coupled signals to the predistorter through the attenuation phase shifting network to predistort the signals. The device superimposes the RF input signal and each coupled signal to realize linearization processing of the RF signal. Using the nonlinear characteristics of the predistorter and the power amplifier circuit orthogonal to each other, the nonlinear product of the power amplifier is cancelled, and the linearization index of the power amplifier is realized. Due to the use of multiple sub-amplifier circuits for pre-distortion processing, it can support more and more complex broadband mixed-mode systems to meet the linearity index in mixed-mode scenarios. Compared with the traditional processing methods, the linearization effect is more effective and effective. The efficiency in supporting broadband mixed mode scenarios is improved. In addition, the whole machine does not need to add an additional heat sink, which reduces the cost, thereby solving the problem that the radio frequency signal linearization processing is low in efficiency and high in cost.

A linearization processing circuit for a radio frequency signal according to an embodiment of the present disclosure includes a predistorter and a power amplifying circuit connected to an output of the predistorter. The power amplifying circuit comprises a plurality of sub-amplifying circuits, each sub-amplifying circuit comprising interconnected power distribution devices, amplifiers and state adjustment lines provided with a coupling network, the coupling network of each sub-amplifying circuit being connected to the pre-distortion via a corresponding attenuation phase-shifting network Device. The predistorter includes a plurality of input interfaces for receiving RF input signals and respective coupled signals for each of the attenuated phase shifting networks, and an output interface for inputting each of the coupled signals and the radio frequency input. The signal is transmitted to the power amplifier circuit.

According to an embodiment of the present disclosure, on the basis of the existing digital pre-distortion linearization technology, the power amplifier of the radio frequency signal is more linearized to solve the situation that the linearity of the power amplifier cannot meet the requirements of the index in the broadband mixed mode scenario.

The embodiment of the present disclosure does not limit the number of sub-amplifying circuits, and may be two sub-amplifying circuits, or three or more sub-amplifying circuits may be provided according to actual needs.

The number of input interfaces of the predistorter is one more than the number of sub amplifying circuits, and one more input interface is used for receiving the RF input signal, and the remaining input interfaces are used for receiving the respective couplings transmitted through the respective attenuation phase shifting networks. signal. For example, when the number of sub-amplifier circuits is two, the predistorter includes three input interfaces, one input interface for receiving the RF input signal, and the other two input interfaces for receiving the transmission through the two attenuation phase shift networks. Two coupled signals; when the number of sub-amplifying circuits is three, the predistorter includes four input interfaces, one input interface for receiving the RF input signal, and the other three input interfaces for receiving the phase shift through the three attenuations Three coupled signals transmitted by the network.

When receiving the RF input signal in the predistorter, the predistorter transmits the RF input signal to each sub-amplifier circuit of the power amplifying circuit, and then the RF input signal is transmitted to the corresponding amplifier through the power distribution device of each sub-amplifier circuit. Amplifying, and then amplifying the RF input signal through a state adjustment line provided with a coupling network to obtain a coupled signal. Since the coupling network of each sub-amplifier circuit is respectively connected with the attenuation phase shifting network, each of the obtained coupling signals can be transmitted back to the predistorter through the corresponding attenuation phase shifting network to perform linearization processing of the radio frequency signals.

It should be noted that, at this time, the predistorter superimposes each coupled signal and the radio frequency input signal to obtain the superimposed radio frequency signal, so as to realize linearization processing of the radio frequency signal.

According to an embodiment of the present disclosure, at least one of a pre-distortion stage amplifying circuit and a push stage amplifying circuit may be connected between the predistorter and the power amplifying circuit.

It should be understood that in the actual power amplifier design, the signal power processed by the predistorter is generally small, and in order to meet the application of high power, a pre-driver amplifier circuit and/or a pre-distortion stage may be connected between the predistorter and the power amplifier circuit. Push the stage amplifier circuit. The RF input signal of the output of the predistorter is amplified by an amplifying circuit and then transmitted to a power amplifying circuit for amplification.

The pre-push stage amplifying circuit and/or the push stage amplifying circuit connected between the predistorter and the power amplifying circuit can amplify the radio frequency input signal transmitted from the predistorter to the power amplifying circuit to enlarge the radio frequency input signal more obvious.

FIG. 3 is a schematic structural diagram of a linearization processing circuit of a radio frequency signal according to an embodiment of the present disclosure.

Referring to FIG. 3, in the present embodiment, the linearization processing circuit includes a predistorter and a power amplifying circuit connected to the output of the predistorter. The sub-amplifying circuit of the power amplifying circuit includes a main amplifying circuit and an auxiliary amplifying circuit. The state adjusting line in the main amplifying circuit is a high-resistance state adjusting line, and the state adjusting line in the auxiliary amplifying circuit is an open state adjusting line. A phase adjustment line is connected between the power distribution device and the amplifier in the auxiliary amplification circuit.

The main amplifying circuit includes a power distribution device connected to each other, a first amplifier (Main Amplifier), and a state adjustment line provided with a first coupling network. The state adjustment line in the main amplification circuit is a high resistance state adjustment line. The first coupling network of the main amplifying circuit is connected to the first attenuating phase shifting network. The first coupling network is used for power coupling of the main power amplifier to obtain a first coupled signal, and then the first coupled signal is input to the predistorter through adjustment of the first attenuated phase shifting network.

The auxiliary amplifying circuit includes interconnected power distribution devices, a second amplifier (Peak Amplifier), and a state adjustment line provided with a coupled network. The state adjustment line in the auxiliary amplification circuit is an open state adjustment line. The coupling network of the auxiliary amplifying circuit is connected to the attenuating phase shifting network, and a phase adjusting line is connected between the power distributing device and the amplifier in the auxiliary amplifying circuit. The second coupling network is used for power coupling of the auxiliary power amplifier to obtain a second coupled signal, and then the second coupled signal is input to the predistorter through adjustment of the second attenuation phase shifting network.

It should be noted that the power distribution devices in the primary amplification circuit and the auxiliary amplification circuit may be the same power distribution device, that is, the primary amplification circuit and the auxiliary amplification circuit share the same power distribution device.

Referring to FIG. 3, since the power amplifying circuit includes two sub-amplifying circuits of a main amplifying circuit and an auxiliary amplifying circuit, the predistorter includes three input interfaces. The predistorter receives the RF input signal RFin through an input interface, and after receiving the RF input signal, transmits the RF input signal to the main amplification circuit and the auxiliary amplification circuit of the power amplification circuit.

At this time, the RF input signal is transmitted to the first amplifier (Main Amplifier) through the power distribution device of the main amplifier circuit for amplification, and then the amplified RF input signal is transmitted to the high-resistance state adjustment line provided with the first coupled network. To obtain the first coupled signal, the first coupled signal is transmitted back to the predistorter through the first attenuated phase shifting network connected to the main amplifying circuit. At the same time, the RF input signal is transmitted from the power distribution device of the auxiliary amplifying circuit through the phase adjustment line to the second amplifier (Peak Amplifier) for amplification, and then the amplified RF input signal is transmitted to the open state adjustment line provided with the second coupled network. And obtaining a second coupled signal, and then transmitting the second coupled signal to the predistorter through the second attenuated phase shifting network connected to the auxiliary amplifying circuit.

The predistorter receives the first coupled signal and the second coupled signal transmitted by the first attenuated phase shifting network and the second attenuated phase shifting network through the other two input interfaces, and then performs the received two coupled signals and the radio frequency input signal. Superimposed to obtain the superimposed RF signal, and the superimposed RF signal RFout is output through a 35 ohm variable resistance line and a circulator.

As can be seen from Fig. 3, the closed loop link 1 and the closed loop link 2 are formed in the main amplifying circuit and the auxiliary amplifying circuit, respectively. The two-way Doherty amplifying circuit shown in FIG. 3 is described in detail as an example, but it should be noted that in an actual mixed mode scenario, in order to balance factors such as efficiency, power, linearity, and the like, embodiments according to the present disclosure are provided. Can be applied to a three-way Doherty amplifier circuit.

According to an embodiment of the present disclosure, at least one of a pre-push stage amplifying circuit and a push stage amplifying circuit may be connected between the power distributing device and the first amplifier (Main Amplifier) in the main amplifying circuit.

According to an embodiment of the present disclosure, the coupling network may include an integrated coupler or a microstrip coupler, and the coupling network is disposed on the microstrip transmission line.

4 is a block diagram showing the structure of a coupler applicable to a linearization processing circuit of a radio frequency signal according to an embodiment of the present disclosure.

The coupling network can use an integrated coupler as well as a microstrip coupler. It should be noted that since the output matching design of the Doherty amplifier circuit involves impedance transformation, when the microstrip coupler is designed, since the curve of the single power amplifier link is monotonous and has no inflection point, the directionality requirement of the coupler can be reduced and coupled. The branch can be designed on a 50 ohm microstrip transmission line or on a microstrip transmission line designed for other impedances, as shown in Figure 4.

FIG. 5 is a schematic structural diagram of a linearization processing circuit of a radio frequency signal according to another embodiment of the present disclosure.

Referring to FIG. 5, the attenuation phase shifting network may include an attenuation network and a phase shifting network connected in series. That is, the first coupling network is connected to the predistorter via the first attenuation network and the first phase shifting network, and the second coupling network is connected to the predistorter via the second attenuation network and the second phase shifting network.

6 shows a schematic structural view of an attenuator applicable to a linearization processing circuit of a radio frequency signal according to an embodiment of the present disclosure, and FIG. 7 illustrates a linearization processing circuit applicable to a radio frequency signal according to an embodiment of the present disclosure. Schematic diagram of the phase shifter.

The attenuation network may comprise a fixed attenuator or an electrically controlled attenuator, and the phase shifting network may comprise a fixed phase shifter or an electronically controlled phase shifter. According to an embodiment of the present disclosure, the attenuation network and the phase shifting network may be separately designed in the design, or may be designed in the same network.

The attenuation network can use either a fixed attenuator or an electronically controlled attenuator, as shown in Figure 6. It should be specially noted that, in order to simplify and standardize the circuit design, a fixed attenuator can be used in one path and an electronically controlled attenuator can be used in the other way. Which attenuator is used in which way is not used in the embodiment of the present disclosure. Make a limit.

The phase shifting network can use either a fixed phase shifter or an electronically controlled phase shifter, as shown in Figure 7. It should be specially noted that, in order to simplify and standardize the circuit design, a fixed phase shifter can be used in one way, and an electronically controlled phase shifter can be used in the other way. Which kind of attenuation is used in the embodiment of the present disclosure The device is not limited.

It should be understood by those skilled in the art that the various components mentioned above may be designed on the same single board, or may be designed on different boards, and are not limited to any specific hardware and software combination.

It should be noted that in the Doherty architecture, the open and compressed states of the primary and secondary channels are not the same, so the distortion curve of the power amplifier is more complicated than the distortion curve shown in FIG. FIG. 8 is a schematic diagram showing superposition of main circuit and auxiliary path distortion curves in the related art, and FIG. 9 is a schematic diagram showing respective distortions of main and auxiliary paths in the related art.

As shown in Fig. 8, there is a partial inflection point after the distortion curves of the main road and the auxiliary road are superimposed, but the distortion curves of the main road and the auxiliary road are curves without an inflection point, as shown in Fig. 9.

According to the technical solution of the present disclosure, the signals of the main path and the auxiliary path can be pre-distorted separately, so that a more ideal correction effect can be obtained, the predistorter is easier to process, and the linearity of the power amplifier in the broadband mixed mode scene is improved, so that The efficiency of the power amplifier in the support of the broadband mixed mode is improved, the whole machine does not need to increase the heat sink, and the derating is not required at high temperatures, which improves the competitiveness of the whole machine.

The technical solution of the present disclosure improves the applicability of the Doherty power in the mixed mode scenario, and significantly improves the linear index of the broadband mixed mode under the rated power, and can be widely applied to the Doherty power amplifying circuit in the broadband mixed mode scene.

FIG. 10 is a schematic flow chart of a linearization processing method of a radio frequency signal according to an embodiment of the present disclosure.

Referring to FIG. 10, a linearization processing method of a radio frequency signal according to an embodiment of the present disclosure may be applied to a linearization processing circuit according to the present disclosure, and includes steps S10 to S40.

At step S10, the radio frequency input signal is transmitted to the power amplifying circuit when the radio frequency input signal is received by the predistorter.

In step S20, the radio frequency input signals are respectively transmitted to the respective sub-amplifying circuits through the power amplifying circuit, and coupled in the coupled network of the respective sub-amplifying circuits to obtain respective coupled signals.

In step S30, the obtained respective coupled signals are respectively transmitted back to the predistorter through the attenuation phase shifting network connected to the respective sub amplifying circuits.

In step S40, the radio frequency input signal is processed in the predistorter using the respective signals returned via the attenuated phase shifting network to obtain the linearized processed radio frequency signal.

Hereinafter, the sub-amplifying circuit including the main amplifying circuit and the auxiliary amplifying circuit will be described in detail as an example.

The predistorter receives the RF input signal RFin through an input interface, and after receiving the RF input signal, transmits the RF input signal to the main amplification circuit and the auxiliary amplification circuit of the power amplification circuit. The RF input signal is transmitted to the first amplifier (Main Amplifier) through the power distribution device of the main amplifier circuit for amplification, and then the amplified RF input signal is transmitted to the high-resistance state adjustment line provided with the first coupling network to obtain the first A coupled signal is passed back to the predistorter through a first attenuated phase shifting network coupled to the main amplifying circuit. At the same time, the RF input signal is transmitted from the power distribution device of the auxiliary amplifying circuit through the phase adjustment line to the second amplifier (Peak Amplifier) for amplification, and then the amplified RF input signal is transmitted to the open state adjustment line provided with the second coupled network. And obtaining a second coupled signal, and then transmitting the second coupled signal to the predistorter through the second attenuated phase shifting network connected to the auxiliary amplifying circuit.

Referring to Fig. 11, in contrast to the embodiment shown in Fig. 10, in the embodiment shown in Fig. 11, step S10 may include steps S11 and S12.

In step S11, when the radio frequency input signal is received by the predistorter, the radio frequency input signal is transmitted to at least one of the pre-push stage amplifying circuit and the push stage amplifying circuit for amplification.

In step S12, the amplified RF input signal is transmitted to the power amplifying circuit.

According to an embodiment of the present disclosure, after the step S40, the method may further include: transmitting the processed radio frequency signal to the plurality of sub-amplifying circuits of the power amplifying circuit, and transmitting to the corresponding coupling network for coupling, to Passing to the predistorter continues linearization; and outputting the linearized RF signal.

According to an embodiment of the present disclosure, the radio frequency input signal and the coupled signal are superimposed by a predistorter to implement linearization processing of the radio frequency signal. At least a portion of the superimposed RF signal may continue to be transmitted to each of the sub-amplifier circuits of the power amplifying circuit to continue performing the linearization process described above to linearize the re-input RF input signal. The processed RF signal can be output through the power amplifying circuit, that is, the processed RF signal can be transmitted to the 35 ohm variable resistance line through the high impedance state adjustment line after being amplified by the first amplifier (Main Amplifier), and after processing After being amplified by the second amplifier (Peak Amplifier), the RF signal is transmitted to the 35 ohm varistor line through the open state adjustment line, and then output through the circulator.

According to an embodiment of the present disclosure, the radio frequency input signal can be linearized to ensure a continuous linearization process of the radio frequency signal.

It is to be understood that the term "comprises", "comprising" or any other variations thereof is intended to encompass a non-exclusive inclusion, such that a process, method, article, or device that comprises a Those elements, but also other elements not explicitly listed, or elements that are inherent to such a process, method, article or device. An element that is defined by the phrase "comprising", without limiting the invention, does not exclude the presence of the same element in the process, method, article, or device that comprises the element.

The above are only the embodiments of the present disclosure, and are not intended to limit the scope of the disclosure, and the equivalent structure or equivalent process transformations made by the disclosure and the contents of the drawings, or directly or indirectly applied in other related technical fields, The same is included in the scope of protection of the present disclosure.

Claims

A linearization processing circuit for a radio frequency signal, comprising a predistorter and a power amplifying circuit connected to an output end of the predistorter, wherein

The power amplifying circuit includes a plurality of sub-amplifying circuits each including a power distribution device connected to each other, an amplifier, and a state adjustment line provided with a coupling network, and a coupling network of each sub-amplifying circuit is connected to the corresponding attenuation phase shifting network to The predistorter,

The predistorter includes a plurality of input interfaces and an output interface, the plurality of input interfaces respectively for receiving RF input signals and respective coupled signals transmitted by respective attenuation phase shifting networks, the output interfaces for coupling each The signal and the RF input signal are transmitted to the power amplifying circuit.
The linearization processing circuit according to claim 1, wherein at least one of a pre-pushing stage amplifying circuit and a push stage amplifying circuit is connected between said predistorter and said power amplifying circuit.
The linearization processing circuit of claim 1, wherein the plurality of sub-amplification circuits comprise a main amplification circuit, and the state adjustment line in the main amplification circuit is a high resistance state adjustment line.
The linearization processing circuit according to claim 3, wherein said plurality of sub-amplifying circuits further comprise an auxiliary amplifying circuit, and the state adjusting line in the auxiliary amplifying circuit is an open state adjusting line.
The linearization processing circuit according to claim 3, wherein at least one of a pre-push stage amplifying circuit and a push stage amplifying circuit is connected between the power distributing means in the main amplifying circuit and the first amplifier.
The linearization processing circuit according to claim 4, wherein a phase adjustment line is connected between the power distribution device and the second amplifier in the auxiliary amplifying circuit.
The linearization processing circuit according to claim 4, wherein said main amplification circuit and said auxiliary amplification circuit share the same power distribution device.
The linearization processing circuit according to any one of claims 1 to 7, wherein the coupling network comprises an integrated coupler or a microstrip coupler, and the coupling network is disposed on a microstrip transmission line.
The linearization processing circuit according to any one of claims 1 to 7, wherein said attenuation phase shifting network comprises an attenuation network and a phase shifting network connected in series, said attenuation network comprising a fixed attenuator or an electrically controlled attenuator, And the phase shifting network comprises a fixed phase shifter or an electronically controlled phase shifter.
A linearization processing method for a radio frequency signal is applied to a linearization processing circuit of a radio frequency signal, the linearization processing circuit comprising a predistorter and a power amplifying circuit connected to an output end of the predistorter, the power amplifying circuit comprising a plurality of sub-amplifier circuits each comprising a power distribution device connected to each other, an amplifier, and a state adjustment line provided with a coupling network, the coupling network of each sub-amplifier circuit being coupled to the predistorter via an attenuation phase shifting network, Methods include:

Transmitting the radio frequency input signal to the power amplifying circuit when receiving the radio frequency input signal through the predistorter;

Transmitting, by the power amplifying circuit, the radio frequency input signals to respective sub-amplifying circuits, and coupling in a coupling network of each sub-amplifying circuit to obtain respective coupling signals;

Passing each of the obtained coupled signals back to the predistorter through an attenuation phase shifting network connected to each of the subamplifying circuits;

The radio frequency input signal is processed in the predistorter using respective signals backhauled via the attenuated phase shifting network to obtain a linearized processed radio frequency signal.
The method for linearizing a radio frequency signal according to claim 10, wherein at least one of a pre-distortion stage and a boost stage amplifying circuit is connected between the predistorter and the power amplifying circuit, and The step of transmitting the radio frequency input signal to the power amplifying circuit comprises:

And transmitting, when the radio frequency input signal is received by the predistorter, transmitting the radio frequency input signal to at least one of a pre-push stage amplifying circuit and a push stage amplifying circuit for amplifying;

The amplified RF input signal is transmitted to the power amplifying circuit.
The method for linearizing a radio frequency signal according to claim 10, wherein the radio frequency input signal is processed in the predistorter by using each of the signals returned via the attenuation phase shifting network to obtain a linearized process. After the step of RF signal, the method further includes:

Transmitting the processed radio frequency signal to the plurality of sub-amplifying circuits of the power amplifying circuit, and transmitting to a corresponding coupling network for coupling to be transmitted back to the predistorter to continue linearization processing;

The linearized RF signal is output.