Three-way high linearity power amplifier and design method thereof

Abstract

The present invention provides a three-way high linearity power amplifier and a design method, wherein the power amplifier comprises a power division module, a main power amplifier module, a phase shift module, a phase compensation module, an auxiliary power amplifier module, an intermodulation distortion signal generation module and an impedance conversion module. In the present invention, the power amplifier is divided into three branches, the input initial radio frequency signal is divided into three branches, the first radio frequency signal component is sequentially amplified and phase-shifted to obtain a second intermediate radio frequency signal, the second radio frequency signal component is sequentially phase-compensated and amplified to obtain a fourth intermediate radio frequency signal, a third-order intermodulation nonlinear signal is generated according to the third radio frequency signal component, and finally the second intermediate radio frequency signal, the fourth intermediate radio frequency signal and the third-order intermodulation nonlinear signal are superimposed and summed, so that the third-order intermodulation component of the second intermediate radio frequency signal, the third-order intermodulation component of the fourth intermediate radio frequency signal and the third-order intermodulation nonlinear signal cancel each other, thereby improving the linearity of the power amplifier.

Description

Technical Field

[0001] The invention relates to the field of microwave technology, and in particular to a three-way high-linearity power amplifier and a design method thereof. Background Art

[0002] 5G wireless communication has the characteristics of high data rate, low latency, large system capacity and large-scale device connection, and MIMO technology and high peak-to-average power ratio modulation are widely used in it. The power amplifier is the most critical component in the wireless communication system, and its linearity directly affects the performance indicators of the entire communication system. Therefore, it is urgent to improve the linearity of the power amplifier.

[0003] The linearity of the power amplifier is mainly affected by its third-order intermodulation components. In order to suppress the generation of third-order intermodulation components and improve the linearity of the power amplifier, various technical means such as negative feedback, feedforward, and predistortion are currently used. However, even if various linearization technical means are used, the improvement of the linearity of the power amplifier is still limited, and the corresponding power amplifier has a complex structure and high cost.

[0004] Therefore, there is an urgent need for a power amplifier technology solution with a simple structure and high linearity. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a power amplifier technical solution based on Schottky diodes to achieve third-order intermodulation component compensation, so as to solve the above-mentioned technical problems.

[0006] To achieve the above-mentioned purpose and other related purposes, the technical solution provided by the present invention is as follows.

[0007] A three-way high linearity power amplifier, comprising:

[0008] A power division module, whose input end serves as the input end of the high linearity power amplifier, whose input end is connected to the initial radio frequency signal, and power-divides the initial radio frequency signal into a first radio frequency signal, a second radio frequency signal and a third radio frequency signal;

[0009] a main power amplifier module, whose input terminal is connected to the first radio frequency signal, amplifying the power of the first radio frequency signal to obtain and output a first intermediate radio frequency signal;

[0010] a phase shift module, whose input end is connected to the first intermediate radio frequency signal, performs phase shift processing on the first intermediate radio frequency signal, obtains and outputs a second intermediate radio frequency signal;

[0011] a phase compensation module, whose input terminal is connected to the second radio frequency signal, performs phase compensation processing on the second radio frequency signal, obtains and outputs a third intermediate radio frequency signal;

[0012] an auxiliary power amplifier module, whose input terminal is connected to the third intermediate radio frequency signal, performs power amplification on the third intermediate radio frequency signal, obtains and outputs a fourth intermediate radio frequency signal;

[0013] an intermodulation distortion signal generating module, the input end of which is connected to the third radio frequency signal, and generates a third-order intermodulation nonlinear signal according to the third radio frequency signal;

[0014] an impedance transformation module, wherein the second intermediate RF signal, the fourth intermediate RF signal and the third-order intermodulation nonlinear signal are simultaneously connected to the input end thereof, the second intermediate RF signal, the fourth intermediate RF signal and the third-order intermodulation nonlinear signal are superimposed, summed and outputted, and the output end thereof is used as the output end of the high linearity power amplifier, and the output end thereof outputs the target RF signal;

[0015] The third-order intermodulation nonlinear signal, the third-order intermodulation component of the second intermediate radio frequency signal, and the third-order intermodulation component of the fourth intermediate radio frequency signal cancel each other out.

[0016] Optionally, the power division module comprises three unequal power division modules.

[0017] Optionally, the main power amplifier module includes a power amplifier tube based on an LDMOS process, and the auxiliary power amplifier module includes a power amplifier tube based on a GaN process.

[0018] Optionally, the intermodulation distortion signal generating module includes a Schottky diode and a bandpass filter, the anode of the Schottky diode is connected to the third RF signal, the cathode of the Schottky diode generates an initial third-order intermodulation nonlinear signal, the bandpass filter is connected to the initial third-order intermodulation nonlinear signal, and the bandpass filter filters the initial third-order intermodulation nonlinear signal to obtain and output the third-order intermodulation nonlinear signal.

[0019] Optionally, the bandpass filter includes a first quarter-wavelength transmission line, a second quarter-wavelength transmission line and a third quarter-wavelength transmission line connected in series in sequence, the input end of the first quarter-wavelength transmission line is connected to the initial third-order intermodulation nonlinear signal, and the output end of the third quarter-wavelength transmission line outputs the third-order intermodulation nonlinear signal.

[0020] Optionally, the length of the first quarter-wavelength transmission line is smaller than the length of the second quarter-wavelength transmission line, the length of the second quarter-wavelength transmission line is smaller than the length of the third quarter-wavelength transmission line, the width of the first quarter-wavelength transmission line is larger than the width of the second quarter-wavelength transmission line, and the width of the second quarter-wavelength transmission line is larger than the width of the third quarter-wavelength transmission line.

[0021] Optionally, the power division module, the main power amplifier module, the phase shift module, the phase compensation module, the auxiliary power amplifier module, the intermodulation distortion signal generation module, and the impedance transformation module all use a Rogers 4350 dielectric substrate with a thickness of 0.508 mm and a dielectric constant of 3.48.

[0022] A three-way high linearity power amplifier design method, comprising:

[0023] A power division module, a main power amplifier module, a phase shift module and an impedance transformation module are provided, and a first output end of the power division module is connected to a first input end of the impedance transformation module via the main power amplifier module and the phase shift module connected in series in sequence, to form a first branch;

[0024] A phase compensation module and an auxiliary power amplifier module are provided, and the second output end of the power division module is connected to the second input end of the impedance transformation module via the phase compensation module and the auxiliary power amplifier module which are connected in series in sequence, so as to form a second branch;

[0025] Providing an intermodulation distortion signal generating module, connecting the third output end of the power division module to the third input end of the impedance conversion module via the intermodulation distortion signal generating module connected in series, thereby forming a third branch;

[0026] Among them, the input end of the power division module serves as the input end of the power amplifier, and the output end of the impedance conversion module serves as the output end of the power amplifier; the intermodulation distortion signal generation module outputs a third-order intermodulation nonlinear signal, and the third-order intermodulation nonlinear signal, the third-order intermodulation component of the second branch output signal, and the third-order intermodulation component of the third branch output signal cancel each other out.

[0027] Optionally, the intermodulation distortion signal generating module includes a Schottky diode and a bandpass filter connected in series in sequence, and the component of the input RF signal after power division by the power division module acts on the Schottky diode, and an initial third-order intermodulation nonlinear signal is generated by the Schottky diode. The initial third-order intermodulation nonlinear signal is filtered by the bandpass filter to obtain the third-order intermodulation nonlinear signal.

[0028] As described above, the three-way high linearity power amplifier and design method provided by the present invention have at least the following beneficial effects:

[0029] The power amplifier structure is divided into three branches, and the input initial radio frequency signal is divided into three branches. The first radio frequency signal component is successively subjected to power amplification processing of the main power amplifier module and phase shift processing of the phase shift module to obtain a second intermediate radio frequency signal. The second radio frequency signal component is successively subjected to phase compensation processing of the phase compensation module and amplification processing of the auxiliary power amplifier module to obtain a fourth intermediate radio frequency signal. The third radio frequency signal component is subjected to conversion processing of the intermodulation distortion signal generation module to obtain a third-order intermodulation nonlinear signal. Finally, the second intermediate radio frequency signal, the fourth intermediate radio frequency signal and the third-order intermodulation nonlinear signal are superimposed and summed, so that the third-order intermodulation component of the second intermediate radio frequency signal, the third-order intermodulation component of the fourth intermediate radio frequency signal and the third-order intermodulation nonlinear signal just cancel each other out, and a target radio frequency signal with high linearity is obtained, which effectively improves the linearity of the power amplifier. The structure is simple, no other complex control circuits are required, the volume is small, and it is easy to be integrated with other microwave circuits. It has strong practicality and application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the structure of the high linearity power amplifier in the present invention.

[0031] Figure 2 for Figure 1 Schematic diagram of the structure of the intermodulation distortion signal generating module 6. DETAILED DESCRIPTION

[0032] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0033] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0034] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0035] As mentioned in the background technology above, when studying the linearity problem of power amplifiers, the inventors found that the current process means or circuit design means are used to improve the linearity of power amplifiers, but the degree of linearity improvement is limited, and the corresponding power amplifiers have complex structural principles and high costs; this is mainly because the nonlinear influencing factors are not corrected or eliminated from the root.

[0036] Based on this, the present invention proposes a technical solution for improving the linearity of a power amplifier: since the third-order intermodulation component is the main factor affecting the linearity of the radio frequency signal, the present invention designs three branches and divides the input initial radio frequency signal into a first radio frequency signal, a second radio frequency signal and a third radio frequency signal, firstly performs power amplification and phase shift processing on the first radio frequency signal through the first branch to obtain a second intermediate radio frequency signal, then performs phase compensation and power amplification processing on the second radio frequency signal through the second branch to obtain a fourth intermediate radio frequency signal, and then generates a third-order intermodulation nonlinear signal based on the third radio frequency signal through the third branch, and finally performs superposition and summation processing on the outputs of the three branches, so that the third-order intermodulation component of the second intermediate radio frequency signal, the third-order intermodulation component of the fourth intermediate radio frequency signal and the third-order intermodulation nonlinear signal just cancel each other out, so as to obtain a target radio frequency signal with high linearity.

[0037] First, if Figure 1 As shown, the present invention provides a three-way high linearity power amplifier, which includes:

[0038] A power division module 1, whose input end serves as the input end of a high linearity power amplifier, and whose input end is connected to an initial radio frequency signal V0, and power-divides the initial radio frequency signal V0 into a first radio frequency signal V01, a second radio frequency signal V02 and a third radio frequency signal V03;

[0039] A main power amplifier module 2, whose input terminal is connected to the first radio frequency signal V01, performs power amplification on the first radio frequency signal V01, obtains and outputs a first intermediate radio frequency signal V04;

[0040] A phase shift module 3, whose input terminal is connected to the first intermediate radio frequency signal V04, performs phase shift processing on the first intermediate radio frequency signal V04, obtains and outputs a second intermediate radio frequency signal V05;

[0041] A phase compensation module 4, whose input terminal is connected to the second RF signal V02, performs phase compensation processing on the second RF signal V02, obtains and outputs a third intermediate RF signal V06;

[0042] an auxiliary power amplifier module 5, whose input terminal is connected to the third intermediate radio frequency signal V06, amplifies the power of the third intermediate radio frequency signal V06, obtains and outputs a fourth intermediate radio frequency signal V07;

[0043] An intermodulation distortion signal generating module 6, whose input terminal is connected to the third radio frequency signal V03, generates a third-order intermodulation nonlinear signal V08 according to the third radio frequency signal V03;

[0044] The impedance conversion module 7 has an input end connected to the second intermediate RF signal V05, the fourth intermediate RF signal V07 and the third-order intermodulation nonlinear signal V08 at the same time, and the second intermediate RF signal V05, the fourth intermediate RF signal V07 and the third-order intermodulation nonlinear signal V08 are superimposed, summed and output, and the output end serves as the output end of the high linearity power amplifier, and the output end outputs the target RF signal V1;

[0045] The third-order intermodulation nonlinear signal V08 , the third-order intermodulation component of the second intermediate RF signal V05 , and the third-order intermodulation component of the fourth intermediate RF signal V07 cancel each other out.

[0046] In detail, the power division module 1 includes three unequal power division modules, such as Figure 1 As shown, the power division module 1 adopts a Wilkinson power division module structure. The power division module 1 includes a dielectric substrate, a transmission line and a resistor. The transmission line and the resistor are arranged on the dielectric substrate. The power division module 1 has an input end and three output ends. The power division module 1 divides the initial RF signal V0 into a first RF signal V01, a second RF signal V02 and a third RF signal V03.

[0047] In detail, Figure 1 As shown, the main power amplifier module 2 amplifies the power of the first RF signal V01 to obtain and output a first intermediate RF signal V04; the main power amplifier module 2 may include a power amplifier tube based on LDMOS process, such as the MRF8P26080 LDMOS process transistor manufactured by Freescale, which is not limited here.

[0048] In detail, Figure 1As shown, the main power amplifier module 2 amplifies the power of the first RF signal V01 to obtain and output a first intermediate RF signal V04; the main power amplifier module 2 may include a power amplifier tube based on LDMOS process, such as the MRF8P26080 LDMOS process transistor manufactured by Freescale, which is not limited here.

[0049] In detail, Figure 1 As shown, the phase shift module 3 performs phase shift processing on the input first intermediate RF signal V04 to obtain and output the second intermediate RF signal V05; the phase shift module 3 can adopt an analog phase shift circuit based on a conventional RC or LC structure, or a digital phase shifter designed based on a standard logic device, which is not limited here.

[0050] In detail, Figure 1 As shown, the phase compensation module 4 performs phase compensation processing on the input second RF signal V02 to obtain and output a third intermediate RF signal V06; like the phase shift module 3, the phase compensation module 4 can adopt an analog phase shift circuit based on a conventional RC or LC structure, or a digital phase shifter designed based on a standard logic device, which is not limited here.

[0051] In detail, Figure 1 As shown, the auxiliary power amplifier module 5 performs power amplification on the input third intermediate radio frequency signal V06 to obtain and output a fourth intermediate radio frequency signal V07; the auxiliary power amplifier module 5 may include a power amplifier tube based on GaN process.

[0052] In detail, Figure 1 As shown, the intermodulation distortion signal generating module 6 generates a third-order intermodulation nonlinear signal V08 according to the third RF signal V03.

[0053] In more detail, Figure 1-Figure 2 As shown, the intermodulation distortion signal generating module 6 includes a Schottky diode D and a bandpass filter, the anode of the Schottky diode D is connected to the third RF signal V03, the cathode of the Schottky diode D generates an initial third-order intermodulation nonlinear signal V09, the bandpass filter is connected to the initial third-order intermodulation nonlinear signal V09, and the bandpass filter filters the initial third-order intermodulation nonlinear signal V09 to obtain and output a third-order intermodulation nonlinear signal V08.

[0054] In more detail, Figure 1-Figure 2 As shown, the bandpass filter includes a first quarter-wavelength transmission line S1, a second quarter-wavelength transmission line S2 and a third quarter-wavelength transmission line S3 which are connected in series in sequence. The input end of the first quarter-wavelength transmission line S1 is connected to an initial third-order intermodulation nonlinear signal V09, and the output end of the third quarter-wavelength transmission line S3 outputs a third-order intermodulation nonlinear signal V08.

[0055] Wherein, the length L of the first quarter-wavelength transmission line S1 is S1 is less than the length L of the second quarter-wavelength transmission line S2 S2 , the length L of the second quarter-wavelength transmission line S2 S2 is less than the length L of the third quarter-wavelength transmission line S3 S3 , the width W of the first quarter-wavelength transmission line S1 S1 Greater than the width W of the second quarter-wavelength transmission line S2 S2 , the width W of the second quarter-wavelength transmission line S2 S2 Greater than the width W of the third quarter-wavelength transmission line S3 S3 .

[0056] In an optional embodiment of the present invention, the length L of the first quarter-wavelength transmission line S1 is S1 The width W of the first quarter-wavelength transmission line S1 is 32.9 mm. S1 The length L of the second quarter-wavelength transmission line S2 is 2.3 mm. S2 The width W of the second quarter-wavelength transmission line S2 is 34.1 mm. S2 The length L of the third quarter-wavelength transmission line S3 is 1.07 mm. S3 The width W of the third quarter-wavelength transmission line S3 is 36.1 mm. S3 It is 0.6mm.

[0057] In more detail, Figure 2 As shown, in the intermodulation distortion signal generating module 6, the anode of the Schottky diode D is connected to the third RF signal V03, and the initial third-order intermodulation nonlinear signal V09 is generated at the cathode of the Schottky diode D by utilizing the inherent characteristics of the Schottky diode D. The bandpass filter composed of the first quarter-wavelength transmission line S1, the second quarter-wavelength transmission line S2 and the third quarter-wavelength transmission line S3 performs filtering processing on the initial third-order intermodulation nonlinear signal V09, and filters out the high-order harmonics in the initial third-order intermodulation nonlinear signal V09, and obtains and outputs the third-order intermodulation nonlinear signal V08. The amplitude of the third-order intermodulation nonlinear signal V08 is equal to the sum of the amplitude of the third-order intermodulation component of the second intermediate RF signal V05 and the amplitude of the third-order intermodulation component of the fourth intermediate RF signal V07, and the sum of the phase of the third-order intermodulation nonlinear signal V08 and the phase of the third-order intermodulation component of the second intermediate RF signal V05 and the phase of the third-order intermodulation component of the fourth intermediate RF signal V07 is zero, so that the third-order intermodulation nonlinear signal V08 just cancels out the third-order intermodulation component of the second intermediate RF signal V05 and the third-order intermodulation component of the fourth intermediate RF signal V07, thereby obtaining a target RF signal V1 with high linearity.

[0058] In addition, in the third branch formed in the intermodulation distortion signal generating module 6, the Schottky diode D has forward conduction and reverse cutoff characteristics, which can prevent power leakage of the main power amplifier module 2 in the first branch and the auxiliary power amplifier module 5 in the second branch.

[0059] It should be noted that the third-order intermodulation nonlinear signal generating device in the intermodulation distortion signal generating module 6 is not limited to Figure 2 The Schottky diode shown may also be other components based on Schottky junction, as long as it can generate a third-order intermodulation nonlinear signal under the control of the third radio frequency signal V03, and the present invention is not limited to this.

[0060] In detail, the impedance transformation module 7 superimposes and sums the second intermediate RF signal V05, the fourth intermediate RF signal V07 and the third-order intermodulation nonlinear signal V08 and outputs them externally, the impedance transformation module 7 provides an adjustable output impedance, and the target RF signal V1 is output externally after passing through the impedance transformation module 7. The impedance transformation module 7 can be an adjustable impedance matching circuit based on an RLC network, which will not be described in detail here.

[0061] In detail, the power division module 1, the main power amplifier module 2, the phase shift module 3, the phase compensation module 4, the auxiliary power amplifier module 5, the intermodulation distortion signal generating module 6 and the impedance transformation module 7 can all adopt a component integrated structure, such as a Rogers 4350 dielectric substrate with a thickness of 0.508 mm and a dielectric constant of 3.48 and various components for integrated design. The modules are independently integrated and manufactured, and each module includes a dielectric substrate and components arranged on the dielectric substrate. Finally, the modules are integrated and assembled to form a complete power amplifier.

[0062] Therefore, on the basis of effectively improving the linearity of the power amplifier, the entire power amplifier has a simple structure, does not require other complex control circuits, and has a highly integrated design. It is small in size and easy to integrate with other microwave circuits, and has strong practicality and application prospects.

[0063] Secondly, based on the same design concept as the above-mentioned high linearity power amplifier, the present invention also provides a three-way high linearity power amplifier design method, which includes the steps of:

[0064] S1, providing a power division module, a main power amplifier module, a phase shift module and an impedance transformation module, connecting the first output end of the power division module to the first input end of the impedance transformation module via the main power amplifier module and the phase shift module connected in series in sequence, to form a first branch;

[0065] S2, providing a phase compensation module and an auxiliary power amplifier module, connecting the second output end of the power division module to the second input end of the impedance transformation module via the phase compensation module and the auxiliary power amplifier module connected in series in sequence, to form a second branch;

[0066] S3, providing an intermodulation distortion signal generating module, connecting the third output end of the power division module to the third input end of the impedance conversion module via the intermodulation distortion signal generating module connected in series, so as to form a third branch;

[0067] Among them, the input end of the power division module is used as the input end of the power amplifier, and the output end of the impedance conversion module is used as the output end of the power amplifier; the intermodulation distortion signal generation module outputs a third-order intermodulation nonlinear signal, and the third-order intermodulation nonlinear signal, the third-order intermodulation component of the second branch output signal, and the third-order intermodulation component of the third branch output signal cancel each other out.

[0068] Among them, the intermodulation distortion signal generating module includes a Schottky diode and a bandpass filter connected in series in sequence. The components of the input RF signal after power division by the power division module act on the Schottky diode, and an initial third-order intermodulation nonlinear signal is generated through the Schottky diode. The initial third-order intermodulation nonlinear signal is filtered through the bandpass filter to obtain a third-order intermodulation nonlinear signal.

[0069] In the above-mentioned high-linearity power amplifier design method, the entire power amplifier is divided into three branches, the first branch performs power amplification and phase shift processing on the RF signal component, the second branch performs phase compensation and power amplification processing on the RF signal component, and the third branch generates a third-order intermodulation nonlinear signal based on the RF signal component. Finally, the output signals of the three branches are superimposed and summed through an impedance transformation module, so that the third-order intermodulation nonlinear signal, the third-order intermodulation component of the second branch output signal, and the third-order intermodulation component of the third branch output signal just cancel each other out, thereby obtaining a target RF signal with high linearity, thereby effectively improving the linearity of the power amplifier.

[0070] In summary, in the three-way high linearity power amplifier and design method provided by the present invention, the entire power amplifier is divided into three branches, the input initial RF signal is divided into three branches, the first RF signal component is sequentially subjected to power amplification processing and phase shift processing to obtain a second intermediate RF signal, the second RF signal component is sequentially subjected to phase compensation processing and power amplification processing to obtain a fourth intermediate RF signal, a third-order intermodulation nonlinear signal is generated according to the third RF signal component, and finally the second intermediate RF signal, the fourth intermediate RF signal and the third-order intermodulation nonlinear signal are superimposed and summed, so that the third-order intermodulation component of the second intermediate RF signal, the third-order intermodulation component of the fourth intermediate RF signal and the third-order intermodulation nonlinear signal just cancel each other out, and a target RF signal with high linearity is obtained, which effectively improves the linearity of the power amplifier, and has a simple structure, no need for other complex control circuits, a small size, and is easy to integrate with other microwave circuits, and has strong practicality and application prospects.

[0071] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A three-way high linearity power amplifier, characterized in that: include: A power division module, whose input end serves as the input end of the high linearity power amplifier, whose input end is connected to the initial radio frequency signal, and power-divides the initial radio frequency signal into a first radio frequency signal, a second radio frequency signal and a third radio frequency signal; a main power amplifier module, whose input terminal is connected to the first radio frequency signal, amplifying the power of the first radio frequency signal to obtain and output a first intermediate radio frequency signal; a phase shift module, whose input end is connected to the first intermediate radio frequency signal, performs phase shift processing on the first intermediate radio frequency signal, obtains and outputs a second intermediate radio frequency signal; a phase compensation module, whose input terminal is connected to the second radio frequency signal, performs phase compensation processing on the second radio frequency signal, obtains and outputs a third intermediate radio frequency signal; an auxiliary power amplifier module, whose input terminal is connected to the third intermediate radio frequency signal, performs power amplification on the third intermediate radio frequency signal, obtains and outputs a fourth intermediate radio frequency signal; an intermodulation distortion signal generating module, the input end of which is connected to the third radio frequency signal, and generates a third-order intermodulation nonlinear signal according to the third radio frequency signal; an impedance transformation module, wherein the second intermediate RF signal, the fourth intermediate RF signal and the third-order intermodulation nonlinear signal are simultaneously connected to the input end thereof, the second intermediate RF signal, the fourth intermediate RF signal and the third-order intermodulation nonlinear signal are superimposed, summed and outputted, and the output end thereof is used as the output end of the high linearity power amplifier, and the output end thereof outputs the target RF signal; The third-order intermodulation nonlinear signal, the third-order intermodulation component of the second intermediate radio frequency signal and the third-order intermodulation component of the fourth intermediate radio frequency signal cancel each other out; Among them, the intermodulation distortion signal generating module includes a Schottky diode and a bandpass filter, the anode of the Schottky diode is connected to the third radio frequency signal, the cathode of the Schottky diode generates an initial third-order intermodulation nonlinear signal, the bandpass filter is connected to the initial third-order intermodulation nonlinear signal, and the bandpass filter performs filtering processing on the initial third-order intermodulation nonlinear signal to obtain and output the third-order intermodulation nonlinear signal.

2. The three-way high linearity power amplifier according to claim 1, characterized in that: The bandpass filter includes a first quarter-wavelength transmission line, a second quarter-wavelength transmission line and a third quarter-wavelength transmission line connected in series in sequence, the input end of the first quarter-wavelength transmission line is connected to the initial third-order intermodulation nonlinear signal, and the output end of the third quarter-wavelength transmission line outputs the third-order intermodulation nonlinear signal.

3. The three-way high linearity power amplifier according to claim 2, characterized in that: The length of the first quarter-wavelength transmission line is smaller than the length of the second quarter-wavelength transmission line, the length of the second quarter-wavelength transmission line is smaller than the length of the third quarter-wavelength transmission line, the width of the first quarter-wavelength transmission line is larger than the width of the second quarter-wavelength transmission line, and the width of the second quarter-wavelength transmission line is larger than the width of the third quarter-wavelength transmission line.

4. A three-way high linearity power amplifier design method, characterized in that: include: A power division module, a main power amplifier module, a phase shift module and an impedance transformation module are provided, and a first output end of the power division module is connected to a first input end of the impedance transformation module via the main power amplifier module and the phase shift module connected in series in sequence, to form a first branch; A phase compensation module and an auxiliary power amplifier module are provided, and the second output end of the power division module is connected to the second input end of the impedance transformation module via the phase compensation module and the auxiliary power amplifier module which are connected in series in sequence, so as to form a second branch; Providing an intermodulation distortion signal generating module, connecting the third output end of the power division module to the third input end of the impedance conversion module via the intermodulation distortion signal generating module connected in series, thereby forming a third branch; The input end of the power division module is used as the input end of the power amplifier, and the output end of the impedance conversion module is used as the output end of the power amplifier; the intermodulation distortion signal generation module outputs a third-order intermodulation nonlinear signal, and the third-order intermodulation nonlinear signal, the third-order intermodulation component of the second branch output signal, and the third-order intermodulation component of the third branch output signal cancel each other out; Among them, the intermodulation distortion signal generating module includes a Schottky diode and a bandpass filter connected in series in sequence, the component of the input RF signal after power division by the power division module acts on the Schottky diode, an initial third-order intermodulation nonlinear signal is generated by the Schottky diode, and the initial third-order intermodulation nonlinear signal is filtered by the bandpass filter to obtain the third-order intermodulation nonlinear signal.

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