CN117856749B

CN117856749B - Power synthesis module and power amplifier

Info

Publication number: CN117856749B
Application number: CN202410176764.XA
Authority: CN
Inventors: 朱伟
Original assignee: Beijing Jushu Technology Co ltd
Current assignee: Beijing Jushu Technology Co ltd
Filing date: 2024-02-08
Publication date: 2024-06-28
Anticipated expiration: 2044-02-08

Abstract

The application relates to the technical field of radio frequency, in particular to a power synthesis module and a power amplifier, which aim to solve the problem of matching the output impedance and the load impedance of the power amplifier. The power synthesis module provided by the application comprises a first signal amplification circuit, a second signal amplification circuit and a coupling inductance circuit; in the coupling inductance circuit, the first inductance and the second inductance are connected in series, the third inductance and the fourth inductance are connected in series, the other end of the third inductance is the output end of the power synthesis module, and the other end of the fourth inductance is grounded; the first inductor and the second inductor are respectively connected with the first ends of the first signal amplifying circuit and the second signal amplifying circuit, and the second ends of the first signal amplifying circuit and the second signal amplifying circuit are input ends of the power synthesis module; the first inductor and the third inductor form a coupling inductor, and the second inductor and the fourth inductor form a coupling inductor. By the coupling inductance, the output impedance of the power combining module can be adjusted to be consistent with the load impedance, so that the load can obtain the maximum power.

Description

Power synthesis module and power amplifier

Technical Field

The application relates to the technical field of radio frequency, in particular to a power synthesis module and a power amplifier.

Background

In the field of radio frequency technology, a signal with lower Power may be amplified by a Power Amplifier (PA), and then the amplified signal is output to a load to drive the load. For example, the load may be an antenna in radio communication. Based on the maximum power transfer (maximum power transfer) theorem, the load can only obtain maximum power if the output impedance of the power amplifier matches the load impedance. There is currently no simple, reliable way to ensure that the output impedance of the power amplifier matches the load impedance, such that the load cannot operate reliably.

Accordingly, there is a need in the art for a new solution to the above-mentioned problems.

Disclosure of Invention

The present application has been made to overcome the above-mentioned drawbacks, and provides a power combining module and a power amplifier that solve or at least partially solve the technical problem of how to simply and reliably ensure output impedance and load impedance matching of the power amplifier.

In a first aspect, a power combining module is provided, the power combining module comprising a first signal amplifying circuit (1), a second signal amplifying circuit (2) and a coupling inductance circuit (3);

the coupling inductance circuit (3) comprises a first inductance branch (31) and a second inductance branch (32);

The first inductance branch circuit (31) comprises a first inductance (311) and a second inductance (312), the first end of the first inductance (311) is connected with the first end of the first signal amplifying circuit (1), the second end of the first inductance (311) is connected with the first end of the second inductance (312), the second end of the second inductance (312) is connected with the first end of the second signal amplifying circuit (2), and the second ends of the first signal amplifying circuit (1) and the second signal amplifying circuit (2) are input ends of the power synthesis module;

The second inductance branch circuit (32) comprises a third inductance (321) and a fourth inductance (322), the first end of the third inductance (321) is the output end of the power synthesis module, the second end of the third inductance (321) is connected with the first end of the fourth inductance (322), and the second end of the fourth inductance (322) is grounded;

wherein the first inductor (311) and the third inductor (321) form a coupling inductor, and the second inductor (312) and the fourth inductor (322) form a coupling inductor.

In one aspect of the above power combining module, the first inductors (311) are plural and the plural first inductors (311) are connected in series; -the second inductance (312) is a plurality and the plurality of second inductances (312) are connected in series; the third inductors (321) are multiple and the multiple third inductors (321) are connected in series; -the fourth inductance (322) is a plurality and the plurality of fourth inductances (322) are connected in series; the first inductors (311), the second inductors (312), the third inductors (321) and the fourth inductors (322) are the same in number.

In one aspect of the above power combining module, the first signal amplifying circuit (1) includes a first amplifier (11) based on transformer coupling; the second signal amplifying circuit (2) comprises a second amplifier (12) based on transformer coupling.

In one aspect of the above power combining module, the first transformer coupling-based amplifier (11) includes a first transformer (111) and a second transformer (112);

The primary side of the first transformer (111) is a second end of the first signal amplifying circuit (1), the first end of the secondary side of the first transformer (111) is grounded, and the second end of the secondary side of the first transformer (111) is connected with the first end of the first inductor (311);

the primary side of the second transformer (112) is the other second end of the first signal amplifying circuit (1), the first end of the secondary side of the second transformer (112) is connected with the first end of the first inductor (311), and the second end of the secondary side of the second transformer (112) is grounded.

In one aspect of the above power combining module, the second transformer coupling-based amplifier (12) includes a third transformer (121) and a fourth transformer (122);

The primary side of the third transformer (121) is a second end of the second signal amplifying circuit (2), the first end of the secondary side of the third transformer (121) is grounded, and the second end of the secondary side of the third transformer (121) is connected with the second end of the second inductor (312);

The primary side of the fourth transformer (122) is the other second end of the second signal amplifying circuit (2), the first end of the secondary side of the fourth transformer (122) is connected with the second end of the second inductor (312), and the second end of the secondary side of the fourth transformer (122) is grounded.

In one aspect of the above power combining module, the number of the first amplifiers (11) based on the transformer coupling is 2 ^N-1, and the number of the second amplifiers (12) based on the transformer coupling is 2 ^N-1; wherein N is more than or equal to 1, and N is an integer.

In one technical scheme of the power synthesis module, the power synthesis module further comprises a harmonic suppression circuit (4);

A first end of the harmonic suppression circuit (4) is connected between the first inductor (311) and the second inductor (312), and a second end of the harmonic suppression circuit (4) is grounded.

In one aspect of the above power combining module, the harmonic suppression circuit (4) includes a fifth inductor (41) and a capacitor (42);

The first end of the fifth inductor (41) is the first end of the harmonic suppression circuit (4), and the second end of the fifth inductor (41) is connected with the first end of the capacitor (42);

the second end of the capacitor (42) is the second end of the harmonic suppression circuit (4).

In a second aspect, there is provided a power amplifier comprising a differential amplification module (5) and the power combining module provided in the first aspect;

The differential amplification module (5) comprises a first input end (51), a second input end (52), a first output end (53) and a second output end (54);

The first input end (51) is used for receiving an input signal, the second input end (52) is grounded, the first output end (53) is connected with the second end of the first signal amplifying circuit (1) in the power synthesis module, and the second output end (54) is connected with the second end of the second signal amplifying circuit (2) in the power synthesis module.

In one aspect of the above power amplifier, the differential amplifying module (5) includes a first-stage differential amplifying circuit (55) and a second-stage differential amplifying circuit (56);

The two input ends of the first-stage differential amplification circuit (55) are the first input end (51) and the second input end (52) respectively, and the two output ends of the first-stage differential amplification circuit (55) are connected with the two input ends of the second-stage differential amplification circuit (56) respectively;

The two output ends of the second-stage differential amplification circuit (56) are the first output end (53) and the second output end (54) respectively.

In one technical scheme of the power amplifier, the differential amplification module (5) comprises 2 ^N paths of second-stage differential amplification circuits (56), N is more than or equal to 1, and N is an integer;

in the 2 ^N -path second-stage differential amplification circuits (56), every two paths of second-stage differential amplification circuits (56) are used as a group of amplification circuits;

In two paths of second-stage differential amplification circuits (56) of each group of amplification circuits, the output end of one path of second-stage differential amplification circuit (56) is connected with one transformer-coupled first amplifier (11) in the power synthesis module, and the output end of the other path of second-stage differential amplification circuit (56) is connected with one transformer-coupled second amplifier (12) in the power synthesis module.

In one aspect of the above power amplifier, the second-stage differential amplification circuit (56) includes a first differential amplification circuit (561) and a second differential amplification circuit (562);

In each path of second-stage differential amplification circuit (56), two input ends of a first differential amplification circuit (561) are connected with one input end of the path of second-stage differential amplification circuit (56), two input ends of a second differential amplification circuit (562) are connected with the other input end of the path of second-stage differential amplification circuit (56), two output ends of the first differential amplification circuit (561) are connected with one output end of the path of second-stage differential amplification circuit (56), and two output ends of the second differential amplification circuit (562) are connected with the other output end of the path of second-stage differential amplification circuit (56).

In one aspect of the above power amplifier, a switch is provided between the first-stage differential amplifying circuit (55) and the second-stage differential amplifying circuit (56), and the switch is used for turning on or off connection of the first-stage differential amplifying circuit (55) and the second-stage differential amplifying circuit (56).

The technical scheme provided by the application has at least one or more of the following beneficial effects:

In the technical scheme of implementing the power synthesis module provided by the application, the power synthesis module comprises a first signal amplification circuit (1), a second signal amplification circuit (2) and a coupling inductance circuit (3); the coupling inductance circuit (3) comprises a first inductance branch (31) and a second inductance branch (32); the first inductance branch circuit (31) comprises a first inductance (311) and a second inductance (312), the first end of the first inductance (311) is connected with the first end of the first signal amplifying circuit (1), the second end of the first inductance (311) is connected with the first end of the second inductance (312), the second end of the second inductance (312) is connected with the first end of the second signal amplifying circuit (2), and the second ends of the first signal amplifying circuit (1) and the second signal amplifying circuit (2) are input ends of the power synthesis module; the second inductance branch circuit (32) comprises a third inductance (321) and a fourth inductance (322), the first end of the third inductance (321) is the output end of the power synthesis module, the second end of the third inductance (321) is connected with the first end of the fourth inductance (322), and the second end of the fourth inductance (322) is grounded; wherein the first inductor (311) and the third inductor (321) form a coupling inductor, and the second inductor (312) and the fourth inductor (322) form a coupling inductor.

In the above embodiment, when the input terminal of the power combining module is connected to the input signal and the output terminal is connected to the load, the output impedance of the power combining module can be adjusted to be consistent with the load impedance through the coupling inductance, so that the load can obtain the maximum power. For example, assuming that the load impedance is 50Ω, the output impedance of each of the first signal amplifying circuit (1) and the second signal amplifying circuit (2) is 25Ω, and the output impedance of the power combining module can be 50Ω by the coupling inductance circuit (3), so that the output impedance is kept consistent with the load impedance.

Drawings

The present disclosure will become more readily understood with reference to the accompanying drawings. As will be readily appreciated by those skilled in the art: the drawings are for illustrative purposes only and are not intended to limit the scope of the present application. Wherein:

fig. 1 is a schematic diagram of a power combining module according to one embodiment of the application;

fig. 2 is a schematic diagram of a power combining module according to another embodiment of the present application;

Fig. 3 is a schematic diagram of a power amplifier according to one embodiment of the application;

Fig. 4 is a schematic diagram of a power amplifier including a two-stage differential amplification circuit according to one embodiment of the application;

FIG. 5 is a schematic diagram of a power amplifier in which each stage of differential amplifying circuit includes two differential amplifying circuits according to one embodiment of the present application;

Fig. 6 is a schematic diagram of a power amplifier having a switch disposed between first and second differential amplifying circuits according to an embodiment of the present application;

Fig. 7 is a schematic diagram of the structure of the power amplifier when n=1 according to an embodiment of the present application;

Fig. 8 is a schematic diagram of a power amplifier when n=2 according to an embodiment of the present application;

List of reference numerals:

1: a first signal amplifying circuit; 2: a second signal amplifying circuit; 3 coupling an inductance circuit; 4: a harmonic suppression circuit; 5: a differential amplification module; 11: a first amplifier; 12: a second amplifier; 111: a first transformer; 112: a second transformer; 121: a third transformer; 122: a fourth transformer; 31: a first inductive branch; 32: a second inductive branch; 311: a first inductance; 312: a second inductor; 313: a third inductance; 314: a fourth inductance; 41: a fifth inductance; 42: a capacitor; 51: a first input; 52: a second input terminal; 53: a first output terminal; 54: a second output terminal; 55: a first stage differential amplifying circuit; 56: a second-stage differential amplifying circuit; 561: a first differential amplifying circuit; 562: and a second differential amplifying circuit.

Detailed Description

Some embodiments of the application are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present application, and are not intended to limit the scope of the present application.

The following describes an embodiment of the power combining module provided by the present application.

Referring to fig. 1, fig. 1 is a schematic diagram of a main structure of a power combining module according to an embodiment of the present application. As shown in fig. 1, the power combining module in the embodiment of the present application mainly includes a first signal amplifying circuit 1, a second signal amplifying circuit 2, and a coupling inductance circuit 3.

The first end of the first signal amplifying circuit 1 is connected with the coupling inductance circuit 3, and the second end is the input end of the power synthesis module; the first end of the second signal amplifying circuit 2 is connected with the coupling inductance circuit 3, and the second end of the second signal amplifying circuit 2 is an input end of the power synthesis module.

The coupled inductor circuit 3 comprises a first inductor branch 31 and a second inductor branch 32, the first inductor branch 31 and the second inductor branch 32 being described below.

1. First inductance branch 31

The first inductive leg 31 comprises a first inductance 311 and a second inductance 312. The first end of the first inductor 311 is connected with the first end of the first signal amplifying circuit 1, and the second end of the first inductor 311 is connected with the first end of the second inductor 312, namely the first inductor 311 and the second inductor 312 are connected in series; a second end of the second inductor 312 is connected to a first end of the second signal amplifying circuit 2.

2. Second inductance branch 32

The second inductive leg 32 comprises a third inductance 321 and a fourth inductance 322. The first end of the third inductor 321 is an output end of the power synthesis module, the second end of the third inductor 321 is connected with the first end of the fourth inductor 322, and the second end of the fourth inductor 322 is grounded, namely the third inductor 321 and the fourth inductor 322 are connected in series.

As shown in fig. 1, the current direction in the power combining module is: the current flows through the first signal amplifying circuit 1, the first inductance branch 31 and the second signal amplifying circuit 2 in sequence, and although the current does not flow through the second inductance branch 32, a coupling inductance is formed between the first inductance branch 31 and the second inductance branch 32, and the output power of the first signal amplifying circuit 1 and the output power of the second signal amplifying circuit 2 can be synthesized through the coupling inductance.

Forming a coupling inductance between the first inductance branch 31 and the second inductance branch 32 includes: the first inductor 311 and the third inductor 321 form a coupling inductor (hereinafter, simply referred to as coupling inductor 1), and the second inductor 312 and the fourth inductor 322 form a coupling inductor (hereinafter, simply referred to as coupling inductor 2). In some embodiments, the inductance values of the first inductor 311 and the second inductor 312 may be equal, the inductance values of the third inductor 321 and the fourth inductor 322 may be equal, and the inductance values of the first inductor 311, the second inductor 312, the third inductor 321 and the fourth inductor 322 may be all equal. Based on this, the coupling coefficients of the coupling inductor 1 and the coupling inductor 2 can be made identical.

The output power of the first signal amplifying circuit 1 and the second signal amplifying circuit 2 can be calculated from the output impedance of the first signal amplifying circuit 1 and the second signal amplifying circuit 2 and the current flowing through the first signal amplifying circuit 1 and the second signal amplifying circuit 2, and the current flowing through the first signal amplifying circuit 1 and the second signal amplifying circuit 2 can be equal according to the current direction, so that the output power is synthesized by the coupling inductance, and the output impedance of the first signal amplifying circuit 1 and the output impedance of the second signal amplifying circuit 2 are actually synthesized. For example, if the output impedances of the first signal amplification circuit 1 and the second signal amplification circuit 2 are 25Ω, respectively, an output impedance of 50Ω can be obtained by the coupling inductance described above. Based on the above, when the input end of the power synthesis module is connected with the input signal and the output end is connected with the load, the output impedance of the power synthesis module can be adjusted to be consistent with the load impedance through the coupling inductor, so that the load can obtain the maximum power. For example, the load impedance is 100deg.OMEGA, the output impedance of the first signal amplifying circuit 1 and the second signal amplifying circuit 2 is 50Ω, and the coupling inductance can obtain 100deg.OMEGA output impedance, which is consistent with the load impedance, so that the load can obtain maximum power.

The first signal amplifying circuit 1, the second signal amplifying circuit 2, and the coupling inductance circuit 3 are further described below.

1. The coupled inductor circuit 3 will be described.

In some embodiments, the first inductor 311 is a plurality of first inductors 311 connected in series, and the first inductors 311 are connected in series to form a new first inductor 311'; the second inductor 312 is a plurality of second inductors 312 connected in series, and the second inductors 312 are connected in series to form a new second inductor 312'; the third inductor 321 is a plurality of third inductors 321 connected in series, and the third inductors 321 are connected in series to form a new third inductor 321'; the fourth inductor 322 is a plurality of fourth inductors 322 connected in series, and the fourth inductors 322 are connected in series to form a new fourth inductor 322'; the first inductor 311, the second inductor 312, the third inductor 321 and the fourth inductor 322 have the same number.

Taking the coupling inductor 1 formed by the first inductor 311 'and the third inductor 321' as an example, the first inductor 311 is set to a plurality of inductance values capable of changing the first inductor 311', the third inductor 321 is set to a plurality of inductance values capable of changing the third inductor 321', and when the inductance values of the first inductor 311 'and the third inductor 321' are changed, the coupling coefficients of the coupling inductors formed by the two are also changed. The number of the first inductor 311, the second inductor 312, the third inductor 321 and the fourth inductor 322 is the same, so that the coupling coefficients of the coupling inductor 1 and the coupling inductor 2 are the same even if the coupling coefficients are changed.

2. The first signal amplification circuit 1 and the second signal amplification circuit 2 will be described.

1. The first signal amplification circuit 1 will be described.

In some embodiments, as shown in fig. 2, the first signal amplifying circuit 1 may include a first amplifier 11 coupled based on a transformer, and the first amplifier 11 may amplify a signal of a primary side of the transformer through the transformer and output the amplified signal through a secondary side of the transformer.

Further, as shown in fig. 2, the first amplifier 11 may include a first transformer 111 and a second transformer 112. The primary side of the first transformer 111 is a second end of the first signal amplifying circuit 1, the first end of the secondary side of the first transformer 111 is grounded, and the second end of the secondary side of the first transformer 111 is connected to the first end of the first inductor 311. The primary side of the second transformer 112 is another second end of the first signal amplifying circuit 1, a first end of the secondary side of the second transformer 112 is connected with a first end of the first inductor 311, and a second end of the secondary side of the second transformer 112 is grounded. By providing two transformers, the signal amplifying capability of the first amplifier 11 can be improved.

2. The second signal amplifying circuit 2 will be described.

In some embodiments, as shown in fig. 2, the second signal amplifying circuit 2 may include a second amplifier 12 coupled based on a transformer, and the second amplifier 12 may amplify a signal of a primary side of the transformer through the transformer and output the amplified signal through a secondary side of the transformer.

Further, as shown in fig. 2, the second amplifier 12 may include a third transformer 121 and a fourth transformer 122. The primary side of the third transformer 121 is a second end of the second signal amplifying circuit 2, the first end of the secondary side of the third transformer 121 is grounded, and the second end of the secondary side of the third transformer 121 is connected to the second end of the second inductor 312. The primary side of the fourth transformer 122 is another second end of the second signal amplifying circuit 2, a first end of the secondary side of the fourth transformer 122 is connected to a second end of the second inductor 312, and a second end of the secondary side of the fourth transformer 122 is grounded. By providing two transformers, the signal amplifying capability of the second amplifier 12 can be improved.

The first amplifier 11 in the first signal amplifying circuit 1 and the second amplifier 12 in the second signal amplifying circuit 2 are further described below.

In some embodiments, the number of first amplifiers 11 is 2 ^N, the number of second amplifiers 12 is also 2 ^N, N.gtoreq.0, and N is an integer. Fig. 2 shows the structures of the first signal amplifying circuit 1 and the second signal amplifying circuit 2 when n=0.

In the present embodiment, the number of first amplifiers 11 and the number of second amplifiers 12 are the same. When N is equal to or greater than 1, the first signal amplifying circuit 1 includes a plurality of first amplifiers 11, and each of the first amplifiers 11 has the same connection relationship with the external structure, wherein the connection relationship with the external structure is referred to in the foregoing description of the first signal amplifying circuit 1. Similarly, the second signal amplifying circuit 2 also includes a plurality of second amplifiers 12, and the connection relationship between each second amplifier 12 and the external structure is the same, and the connection relationship between the second amplifier and the external structure is referred to in the foregoing description of the second signal amplifying circuit 2.

The power combining module will be described further.

Referring to fig. 1 again, the current in the power combining module flows through the first signal amplifying circuit 1, the first inductance branch 31 and the second signal amplifying circuit 2 in sequence, when the current contains harmonic current, harmonic loss is generated, and the output power of the power combining module, that is, the power after the output power of the first signal amplifying circuit 1 and the output power of the second signal amplifying circuit 2 are combined through the coupling inductance, can be reduced due to the harmonic loss. If the output power of the power combining module is reduced, the output impedance of the power combining module is also reduced, so that the output impedance of the power combining module and the load impedance may not be ensured to be consistent.

In this regard, in some embodiments, as shown in fig. 2, the power synthesis module may further include a harmonic suppression circuit 4 in addition to the first signal amplification circuit 1, the second signal amplification circuit 2, and the coupling inductance circuit 3, where a first end of the harmonic suppression circuit 4 is connected between the first inductance 311 and the second inductance 312, and a second end of the harmonic suppression circuit 4 is grounded. The harmonic current in the power synthesis module can be restrained or eliminated through the harmonic suppression circuit 4, and harmonic loss caused by the harmonic current is prevented, so that the output power of the power synthesis module is ensured not to be influenced by the harmonic current.

In some embodiments, as shown in fig. 2, the harmonic rejection circuit 4 may include a fifth inductance 41 and a capacitance 42. The first end of the fifth inductor 41 is the first end of the harmonic suppression circuit 4, and the second end of the fifth inductor 41 is connected with the first end of the capacitor 42; a second terminal of the capacitor 42 is a second terminal of the harmonic rejection circuit. The fifth inductor 41 and the capacitor 42 can form an LC harmonic suppression circuit, by which the 2 nd harmonic current can be effectively suppressed, and since the harmonic loss due to the N harmonic current is relatively small, the N harmonic can not be suppressed, and N is not less than 3.

Embodiments of the power amplifier provided by the present application are described below.

Referring to fig. 3, fig. 3 is a schematic diagram of a main structure of a power amplifier according to an embodiment of the present application. As shown in fig. 3, the power amplifier in the embodiment of the present application mainly includes the differential amplifying module 5 and the power combining module described in the foregoing embodiment.

The differential amplification module 5 comprises a first input 51, a second input 52, a first output 53, and a second output 54. The first input terminal 51 is used for receiving an input signal, the second input terminal 52 is grounded, the first output terminal 53 is connected to the second terminal of the first signal amplifying circuit 1 in the power combining module, and the second output terminal 54 is connected to the second terminal of the second signal amplifying circuit 2 in the power combining module. That is, the differential structure of the differential amplifying module 5 is a single-ended input and a double-ended output.

The differential amplification module 5 may include a multi-stage amplification circuit.

In some embodiments, as shown in fig. 4, the differential amplification module 5 includes a first stage differential amplification circuit 55 and a second stage differential amplification circuit 56, which are two stages in total.

The two input ends of the first-stage differential amplification circuit 55 are a first input end 51 and a second input end 52, respectively, and the two output ends of the first-stage differential amplification circuit 55 are connected with the two input ends of the second-stage differential amplification circuit 56, respectively. The two output terminals of the second-stage differential amplifier circuit 56 are the first output terminal 53 and the second output terminal 54, respectively.

The amplification factor of the signal can be increased by the two-stage amplification circuit compared to the one-stage amplification circuit, so that even a weak signal can be reliably amplified.

The second-stage differential amplifier circuit 56 is further described below.

In some embodiments, the differential amplification module 5 includes 2 ^N second stage differential amplification circuits 56, where N is greater than or equal to 1 and N is an integer. Of the 2 ^N second-stage differential amplifier circuits 56, every two second-stage differential amplifier circuits 56 function as a set of amplifier circuits. As can be seen from the foregoing embodiments of the power combining module, the number of the first amplifiers 11 and the second amplifiers 12 in the power combining module is 2 ^N-1, and the values of N in the embodiment 2 ^N and 2 ^N-1 are the same.

In the two second-stage differential amplification circuits 56 of each set of amplification circuits, the output end of one second-stage differential amplification circuit 56 is connected with one transformer-coupled first amplifier 11 in the power synthesis module, and the output end of the other second-stage differential amplification circuit 56 is connected with one transformer-coupled second amplifier 12 in the power synthesis module.

Each of the second-stage differential amplifying circuits 56 includes a first differential amplifying circuit 561 and a second differential amplifying circuit 562.

The connection relationship between the second-stage differential amplifier circuit 56 and the power combining block will be described below with reference to fig. 5, taking n=1 as an example.

When n=1, the differential amplification module 5 includes two second-stage differential amplification circuits 56 as a set of amplification circuits. The power combining module comprises a first amplifier 11 and a second amplifier 12.

As shown in fig. 5, in each of the second-stage differential amplifier circuits 56, two input terminals of a first differential amplifier circuit 561 are connected to one input terminal of the second-stage differential amplifier circuit 56, two input terminals of a second differential amplifier circuit 562 are connected to the other input terminal of the second-stage differential amplifier circuit 56, two output terminals of the first differential amplifier circuit 561 are connected to one output terminal of the second-stage differential amplifier circuit 56, and two output terminals of the second differential amplifier circuit 562 are connected to the other output terminal of the second-stage differential amplifier circuit 56.

One output end of the second-stage differential amplification circuit 56 is connected with the first amplifier 11, and the other output end of the second-stage differential amplification circuit 56 is connected with the second amplifier 12.

The differential amplification module 5 will be further described below.

In some embodiments, a switch is provided between the first stage differential amplifier circuit 55 and the second stage differential amplifier circuit 56, for turning on or off the connection of the first stage differential amplifier circuit 55 and the second stage differential amplifier circuit 56.

As shown in fig. 6, when the differential amplification module 5 includes two paths of second-stage differential amplification circuits 56, a switch S1 is disposed between the first-stage differential amplification circuit 55 and one path of second-stage differential amplification circuits 56, and the switch S1 can be turned on or turned off; a switch S2 is arranged between the first-stage differential amplifying circuit 55 and the other second-stage differential amplifying circuit 56, and the switch S2 can be connected or disconnected.

Different loads may have different load impedances, and the output power requirements of the power amplifier may be different in order to ensure that the output impedance of the power amplifier and the load impedance remain consistent. When the output power of one second-stage differential amplifying circuit 56 can meet the requirement and the output impedance and the load impedance of the power amplifier can be kept consistent, the switch between the other second-stage differential amplifying circuit 56 and the first-stage differential amplifying circuit 55 can be closed at this time, and the connection of the two circuits is disconnected.

In some embodiments, the power supply of the second-stage differential amplification circuit 56 may be controlled in addition to the connection or disconnection of the switches described above; if the power supply is turned off, the second-stage differential amplification circuit 56 cannot work normally, and the connection between the second-stage differential amplification circuit 56 and the first-stage differential amplification circuit 55 is disconnected; when the power supply is turned on, the second-stage differential amplifier circuit 56 can operate normally, which is equivalent to turning on the connection between the second-stage differential amplifier circuit 56 and the first-stage differential amplifier circuit 55.

The power amplifier will be briefly described again with reference to fig. 7 and 8.

According to the foregoing embodiment, the differential amplifying module 5 includes 2 ^N second-stage differential amplifying circuits, the number of the first amplifiers and the second amplifiers in the power combining module is 2 ^N-1, N is greater than or equal to 1, and N is an integer. Fig. 7 and 8 are schematic diagrams of the power amplifier when n=1 and n=2, respectively. Fig. 7 and 8 are described below.

Referring to fig. 7, fig. 7 illustrates a power amplifier structure when n=1. The power amplifier comprises a first-stage differential amplifying circuit, two second-stage differential amplifying circuits and a power synthesis module, wherein the power synthesis module comprises a first amplifier and a second amplifier, the first amplifier comprises two transformers (namely a first transformer and a second transformer), and the second amplifier also comprises two transformers (namely a third transformer and a fourth transformer).

Vin represents an input signal, vout represents an output signal, arrows represent directions of currents, and VG1, VDD, and VG2 are power supplies. The PA1 and the PA2 are respectively a first differential amplifying circuit and a second differential amplifying circuit in one path of differential amplifying circuit, and the PA1 and the PA2 are respectively connected with a first transformer and a second transformer in the first amplifier. The PA3 and the PA4 are respectively a first differential amplifying circuit and a second differential amplifying circuit in the other differential amplifying circuit, and the PA3 and the PA4 are respectively connected with a third transformer and a fourth transformer in the second amplifier. The two L2 are respectively a first inductor and a second inductor in the power synthesis module, and the two L1 are respectively a third inductor and a fourth inductor in the power synthesis module. L3 and C1 are the fifth inductance and capacitance, respectively, in the harmonic rejection circuit.

Referring to fig. 8, fig. 8 illustrates a power amplifier structure when n=2. The power amplifier comprises a first-stage differential amplifying circuit, four paths of second-stage differential amplifying circuits and a power synthesis module, wherein every two paths of second-stage differential amplifying circuits are used as one group of amplifying circuits, namely two groups of amplifying circuits. The power combining module includes two first amplifiers including two transformers (i.e., a first transformer and a second transformer) and two second amplifiers including two transformers (i.e., a third transformer and a fourth transformer).

The PA1 is a first differential amplifying circuit of a second-stage differential amplifying circuit in the first group of amplifying circuits, and the PA1 is connected with a first transformer of a first amplifier; the PA2 is a second differential amplifying circuit of one path of amplifying circuit of the first group, and the PA2 is connected with a second transformer of the first amplifier.

The PA3 is a first differential amplifying circuit of another second-stage differential amplifying circuit in the first group of amplifying circuits, and the PA3 is connected with a first transformer of a second first amplifier; the PA4 is a second differential amplifying circuit of another second differential amplifying circuit in the first group of amplifying circuits, and the PA4 is connected with a second transformer of the second first amplifier.

The meanings of PA4 to PA8 are similar to PA1 to PA4, respectively, and will not be described again.

L1 and L2 are respectively a first inductor and a second inductor in the power synthesis module, and L3 and L4 are respectively a third inductor and a fourth inductor in the power synthesis module. L5 and C are the fifth inductance and capacitance, respectively, in the harmonic rejection circuit.

Thus far, the technical solution of the present application has been described in connection with one embodiment shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present application is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present application, and such modifications and substitutions will fall within the scope of the present application.

Claims

1. A power combining module, characterized in that the power combining module comprises a first signal amplifying circuit (1), a second signal amplifying circuit (2) and a coupling inductance circuit (3);

Wherein the first inductor (311) and the third inductor (321) form a coupling inductor, and the second inductor (312) and the fourth inductor (322) form a coupling inductor;

the first signal amplifying circuit (1) comprises a first amplifier (11) based on transformer coupling;

the second signal amplifying circuit (2) comprises a second amplifier (12) based on transformer coupling;

The number of the first amplifiers (11) based on the transformer coupling is 2 ^N-1, and the number of the second amplifiers (12) based on the transformer coupling is 2 ^N-1; wherein N is more than or equal to 1, and N is an integer.

2. The power combining module of claim 1, wherein,

The first inductors (311) are a plurality of and the plurality of first inductors (311) are connected in series;

-the second inductance (312) is a plurality and the plurality of second inductances (312) are connected in series;

the third inductors (321) are multiple and the multiple third inductors (321) are connected in series;

-the fourth inductance (322) is a plurality and the plurality of fourth inductances (322) are connected in series;

the first inductors (311), the second inductors (312), the third inductors (321) and the fourth inductors (322) are the same in number.

3. The power combining module according to claim 1, characterized in that the first transformer coupling based amplifier (11) comprises a first transformer (111) and a second transformer (112);

4. The power combining module of claim 1, wherein the second transformer-coupling-based amplifier (12) comprises a third transformer (121) and a fourth transformer (122);

5. The power combining module according to claim 1, characterized in that it further comprises a harmonic suppression circuit (4);

6. The power combining module according to claim 5, characterized in that the harmonic rejection circuit (4) comprises a fifth inductance (41) and a capacitance (42);

7. A power amplifier, characterized in that it comprises a differential amplification module (5) and a power synthesis module according to any of claims 1 to 6;

8. The power amplifier according to claim 7, wherein the differential amplification module (5) comprises a first stage differential amplification circuit (55) and a second stage differential amplification circuit (56);

9. The power amplifier according to claim 8, wherein the differential amplification module (5) comprises 2 ^N second-stage differential amplification circuits (56), N is greater than or equal to 1, N is an integer;

10. The power amplifier of claim 9, wherein the second stage differential amplification circuit (56) comprises a first differential amplification circuit (561) and a second differential amplification circuit (562);

11. A power amplifier according to claim 9 or 10, characterized in that,

A switch is arranged between the first-stage differential amplification circuit (55) and the second-stage differential amplification circuit (56), and the switch is used for switching on or switching off the connection of the first-stage differential amplification circuit (55) and the second-stage differential amplification circuit (56).