Active load modulation radio frequency power amplification circuit, chip and communication equipment

Abstract

The embodiment of the invention provides an active load modulation radio frequency power amplification circuit, a chip and communication equipment, and a first amplifier is used for receiving and amplifying a radio frequency signal. The bisection power distribution circuit is used for dividing the amplified radio frequency signal into a first signal and a second signal with the same power. The second circuit is used for outputting control signals. The coupler is used for receiving a first signal through the first input end, receiving a second signal through the second input end, receiving a control signal through the isolation end and outputting a radio frequency signal through the output end. According to the scheme, the bisection power distribution circuit is used for replacing an amplifier and a coupler in an existing power amplification circuit, the amplitude and the phase of signals entering the coupler can be better kept consistent, and the influence on the performance of the active load modulation radio frequency power amplification circuit caused by the individual difference of the amplifiers is reduced; and the consistency of batch production is improved, so that the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to an active load modulation radio frequency power amplifier circuit, a chip and a communication device. Background Art

[0002] In current wireless communication systems, RF power amplifiers are the main components, and the performance of the entire communication system is affected by its indicators, such as efficiency, bandwidth, output power and linearity. With the development of communication technology, the transmission rate of information is constantly increasing, which puts higher and higher requirements on the bandwidth and efficiency indicators of power amplifiers.

[0003] Traditional active load modulated balanced RF power amplifier circuits are all analyzed based on the characteristics of 3dB couplers, so they have high requirements for the amplitude and phase of the signal entering the 3dB coupler. However, the existing active load modulated balanced RF power amplifier circuits require two amplifiers to input signals in parallel at the two input ends of the coupler, so the output signals of the two amplifiers are not only required to be consistent in amplitude, but also have high requirements for phase. However, even for the same model of transistor amplifiers or capacitor amplifiers, etc., there will still be differences between different individuals in mass production. These differences will be amplified in the balanced architecture that strictly requires symmetry, resulting in a significant decline in performance and poor consistency in mass production.

[0004] In addition, the existing active load modulation balanced RF power amplifier circuit requires the use of three power amplifiers, which is costly and has high requirements for the PCB (Printed Circuit Board) area, which is contrary to the current trend of communication equipment to pursue low cost and miniaturization. Summary of the invention

[0005] The purpose of the embodiments of the present invention is to provide an active load modulated radio frequency power amplifier circuit, chip and communication device to solve the technical problems that the existing active load modulated radio frequency power amplifier circuit has high production cost and individual differences between the amplifiers used will have a significant impact on the performance of the amplifier circuit. The specific technical solution is as follows:

[0006] In a first aspect of an embodiment of the present invention, an active load modulated radio frequency power amplifier circuit is provided, comprising a first circuit and a second circuit; the first circuit comprises a first amplifier, a halved power distribution circuit and a coupler;

[0007] The output end of the first amplifier is connected to the input end of the bisection power distribution circuit, the first output end of the bisection power distribution circuit is connected to the first input end of the coupler, and the second output end of the bisection power distribution circuit is connected to the second input end of the coupler;

[0008] The output end of the second circuit is connected to the isolation end of the coupler;

[0009] The first amplifier is used to receive and amplify the radio frequency signal;

[0010] The bisection power distribution circuit is used to divide the amplified radio frequency signal into a first signal and a second signal with the same power, and there is a specific phase difference between the first signal and the second signal;

[0011] The second circuit is used to output a control signal;

[0012] The coupler is used to receive the first signal through the first input terminal, receive the second signal through the second input terminal, receive the control signal through the isolation terminal, and output a radio frequency signal through an output terminal.

[0013] Optionally, the bisection power distribution circuit is a bisection power divider or a 3dB coupled microstrip circuit.

[0014] Optionally, the impedance Z of the first input end of the coupler is B1 , the impedance Z of the second input of the coupler B2 , the characteristic impedance Z of the coupler O , the impedance Z of the isolated end of the coupler C , which conforms to the following formula:

[0015]

[0016] Z C =Z O

[0017] Among them, I C represents the input current of the isolated end of the coupler, I C with I b1 The phase difference, I b1 represents the input current of the first input terminal of the coupler.

[0018] Optionally, the second circuit includes a second amplifier, and the second amplifier is used to amplify the initial control signal to obtain the control signal.

[0019] Optionally, the specific phase difference between the first signal and the second signal is 90°.

[0020] Optionally, when the active load modulated RF power amplifier circuit is in low-power operation, the second circuit is in an operating state, the first circuit is in an open circuit state, and the output signal is the control signal.

[0021] Optionally, when the active load modulated RF power amplifier circuit is in high-power operation, the first circuit and the second circuit are both in operation, and the output signal is a combined control signal, the first signal, and the second signal.

[0022] Optionally, the coupler is a 3dB coupler.

[0023] In a second aspect of an embodiment of the present invention, a chip is provided, comprising any one of the active load modulation radio frequency power amplifier circuits described above.

[0024] In a third aspect of an embodiment of the present invention, a communication device is provided, comprising the chip as described above.

[0025] Beneficial effects of the embodiments of the present invention:

[0026] An active load modulated radio frequency power amplifier circuit, chip and communication device provided in an embodiment of the present invention include a first circuit and a second circuit. The first circuit includes a first amplifier, a bisection power distribution circuit and a coupler. The output end of the first amplifier is connected to the input end of the bisection power distribution circuit, the first output end of the bisection power distribution circuit is connected to the first input end of the coupler, and the second output end of the bisection power distribution circuit is connected to the second input end of the coupler. The output end of the second circuit is connected to the isolation end of the coupler. The first amplifier is used to receive and amplify the radio frequency signal, and the bisection power distribution circuit is used to divide the amplified radio frequency signal into a first signal and a second signal with the same power, and there is a specific phase difference between the first signal and the second signal. The second circuit is used to output a control signal. The coupler is used to receive the first signal through the first input end, receive the second signal through the second input end, receive the control signal through the isolation end, and output the radio frequency signal through the output end.

[0027] The active load modulation RF power amplifier circuit provided by this solution uses a two-part power distribution circuit to replace an amplifier and a coupler in the existing power amplifier circuit, reducing the number of amplifier components used, and solving the technical problem that the existing technology needs to use three power amplifiers, resulting in high costs and high requirements for PCB area, which is contrary to the current trend of communication equipment pursuing low cost and miniaturization.

[0028] At the same time, by dividing the RF signal into a first signal and a second signal of the same power through a two-equal power distribution circuit, the amplitude and phase of the signal entering the coupler can be kept more consistent, reducing the impact of individual differences in amplifiers on the performance of the active load modulation RF power amplifier circuit, improving the consistency of mass production, and thus improving production efficiency. Further achieving broadband high-efficiency performance, while having the advantages of stronger consistency, simpler implementation, lower cost, and more resource conservation.

[0029] Of course, it is not necessary to achieve all of the advantages described above at the same time to implement any product or method of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments can also be obtained based on these drawings.

[0031] Figure 1 A schematic diagram of a structure of an active load modulation radio frequency power amplifier circuit in the prior art;

[0032] Figure 2 A schematic diagram of the structure of an active load modulated radio frequency power amplifier circuit provided in an embodiment of the present application;

[0033] Figure 3 A schematic diagram of a structure of a resistive bisection power divider provided in an embodiment of the present application;

[0034] Figure 4 A schematic diagram of the structure of an LC-type bisection power divider provided in an embodiment of the present application;

[0035] Figure 5 A schematic diagram of the structure of a 3dB coupler provided in an embodiment of the present application;

[0036] Figure 6 Another structural schematic diagram of the active load modulated radio frequency power amplifier circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field based on this application belong to the scope of protection of the present invention.

[0038] In current wireless communications, higher and higher requirements are placed on the efficiency, bandwidth, output power and linearity of RF power amplifiers. Existing high-efficiency RF power amplifiers are based on active load modulation technology, see Figure 1 , Figure 1The figure is a schematic diagram of a structure of an active load modulation balanced RF power amplifier circuit in the prior art. The conventional active load modulation balanced RF power amplifier circuit includes a control amplifier PA1, a sliding resistor Δφ, a group of balanced amplifiers, a 3dB coupler X2, and two loads Z1 and Z2, wherein a group of balanced amplifiers includes amplifiers PA2 and PA3, and a 3dB coupler X1. Figure 1 It can be seen that the existing active load modulated balanced RF power amplifier circuits are all analyzed based on the characteristics of the 3dB coupler, so the signal amplitude and phase entering the 3dB coupler are required to be high. However, it is well known that even for amplifiers of the same model, there will still be differences between different individuals in mass production. These differences will be amplified in the balanced architecture that strictly requires symmetry, resulting in a significant decline in performance and poor consistency in mass production. In addition, the existing active load modulated balanced RF power amplifier circuit requires the use of three amplifiers, which is costly and has high requirements for PCB area, which is contrary to the current trend of pursuing low-cost miniaturization of communication equipment.

[0039] In order to solve the above technical problems, the present application provides an active load modulated radio frequency power amplifier circuit, including a first circuit and a second circuit, wherein the first circuit includes a first amplifier, a bisection power distribution circuit and a coupler. The output end of the first amplifier is connected to the input end of the bisection power distribution circuit, the first output end of the bisection power distribution circuit is connected to the first input end of the coupler, and the second output end of the bisection power distribution circuit is connected to the second input end of the coupler. The output end of the second circuit is connected to the isolation end of the coupler. Figure 2 , Figure 2 A schematic diagram of a structure of an active load modulated radio frequency power amplifier circuit provided in an embodiment of the present application includes:

[0040] The first amplifier 201 is used to receive and amplify the radio frequency signal.

[0041] The first amplifier 201 can amplify the radio frequency signal sent by the signal source INb, and then output a radio frequency signal with higher power.

[0042] The first amplifier in this embodiment is a peak power amplifier, which works in class C. The first amplifier does not work when the input signal has low power, and only when the input signal power reaches a certain threshold, the first amplifier starts to work.

[0043] The two-equal power distribution circuit 202 is used to divide the amplified radio frequency signal into a first signal and a second signal with the same power, and there is a specific phase difference between the first signal and the second signal.

[0044] The 2-equal power distribution circuit 202 provided in this embodiment is used to evenly distribute the input power to two output ports to ensure that subsequent components can receive signals with equal power and there is a specific phase difference between the two signals.

[0045] The phase difference between the first signal and the second signal refers to the phase difference between the two signals, which can usually be expressed in degrees or radians. If the phase difference between the first signal and the second signal is 0° or an even multiple of π radians, it means that the two signals are completely in phase. If the phase difference between the first signal and the second signal is 180° or π radians, it means that the two signals are completely out of phase. If the phase difference between the first signal and the second signal is 90° or radians, indicating that the two signals are orthogonal.

[0046] The second circuit is used for outputting a control signal.

[0047] In this embodiment, the output impedance of the 2-way power distribution circuit can be modulated by adjusting the amplitude and phase of the initial control signal input by INc.

[0048] The coupler 203 is used to receive a first signal through the first input terminal 11 , receive a second signal through the second input terminal 12 , receive a control signal through the isolation terminal 13 , and output a radio frequency signal through the output terminal 14 .

[0049] The coupler 203 provided in this embodiment is a four-port device, and the four ports are respectively a first input terminal, a second input terminal, an isolation terminal and an output terminal. It is usually composed of two transmission lines called a through line (main line) and a coupled line (sub-line). Based on the characteristics of the coupler, the signal power and phase requirements entering the first input terminal and the second input terminal of the coupler are usually high. In an embodiment of the present application, the first input terminal of the coupler is connected to the first output terminal of the bisection power distribution circuit, and the second input terminal of the coupler is connected to the second output terminal of the bisection power distribution circuit. Because the bisection power distribution circuit can divide the received amplified radio frequency signal into a first signal and a second signal with equal power, and there is a specific phase difference between the first signal and the second signal. Therefore, the two signals input by the first input terminal and the second input terminal of the coupler can meet the high requirements of the coupler for the input signal.

[0050] The active load modulation radio frequency power amplifier circuit provided in the embodiment of the present application includes a first circuit and a second circuit. The first circuit includes a first amplifier, a bisection power distribution circuit and a coupler. The output end of the first amplifier is connected to the input end of the bisection power distribution circuit, the first output end of the bisection power distribution circuit is connected to the first input end of the coupler, and the second output end of the bisection power distribution circuit is connected to the second input end of the coupler. The output end of the second circuit is connected to the isolation end of the coupler. The first amplifier is used to receive and amplify the radio frequency signal. The bisection power distribution circuit is used to divide the amplified radio frequency signal into a first signal and a second signal with the same power, wherein there is a specific phase difference between the first signal and the second signal. The second circuit is used to output a control signal. The coupler is used to receive the first signal through the first input end, receive the second signal through the second input end, receive the control signal through the isolation end, and output the radio frequency signal through the output end.

[0051] The active load modulated RF power amplifier circuit provided in the embodiment of the present application adopts a two-way power distribution circuit to divide the RF signal amplified by the first amplifier into a first signal and a second signal with the same power and a specific phase difference, thereby eliminating the need to use two parallel amplifiers to amplify the RF signal separately, reducing the number of amplifiers in the circuit, reducing costs, and reducing requirements for PCB board area, which is in line with the current trend of communication equipment pursuing low cost and miniaturization.

[0052] At the same time, by dividing the RF signal into a first signal and a second signal with the same power and a specific phase difference through a two-equal power distribution circuit, the amplitude and phase of the signal entering the coupler can be kept more consistent, reducing the impact of individual differences in amplifiers on the performance of the active load modulation RF power amplifier circuit, improving the consistency of mass production, and thus improving production efficiency. Further achieving broadband high-efficiency performance, while having the advantages of stronger consistency, simpler implementation, lower cost, and more resource conservation.

[0053] In the embodiment of the present application, the aforementioned two-equal power distribution circuit may be a two-equal power divider or a 3dB coupled microstrip circuit.

[0054] The two-way power divider is a three-port network structure with one input and two outputs. The sum of the power of the two outputs is equal to the power of the input, and the output power of the two outputs is equal. According to the different components used in the circuit, the two-way power divider can be divided into a resistive two-way power divider and an LC (inductor-capacitor) two-way power divider.

[0055] See also Figure 3 , Figure 3A schematic diagram of a resistive bisection power divider provided in an embodiment of the present application. The resistive bisection power divider uses a resistor element Z O To achieve two-equal distribution of power, where P1 is the input port and P2 and P3 are two output ports.

[0056] See also Figure 4 , Figure 4 A schematic diagram of a structure of an LC-type bisection power divider provided in an embodiment of the present application. The LC-type bisection power divider uses two inductors L, two capacitors C and a load Z. O To achieve two-equal distribution of power, where P1 is the input port and P2 and P3 are two output ports.

[0057] 3dB coupled microstrip circuits can be realized by using 3dB couplers. Figure 5 , Figure 5 A schematic diagram of the structure of a 3dB coupler provided in an embodiment of the present application. Because the 3dB coupler is a four-port device, a load can be connected to one of its ports (for example, at port 2). The 3dB coupler is regarded as a device with one input port (port 1) and two output ports (port 3 and port 4). Based on the characteristics of the 3dB coupler, two signals with equal power and amplitude and a phase difference of 90° can be output at the output port.

[0058] The 3dB coupled microstrip circuit uses a microstrip line structure. Microstrip line is a common transmission line used to transmit signals in PCB design. Its main component is a single-layer or double-layer metal line with a narrow width and relatively small thickness, which is usually designed to be stacked on the surface or internal layer of the PCB board.

[0059] The above-mentioned different types of two-equal power distribution circuits can all divide the received radio frequency signal amplified by the first amplifier into a first signal and a second signal with the same power and amplitude, and the phase difference between the two signals is 90°.

[0060] In the embodiment of the present application, an amplifier and a coupler in the existing amplification circuit are replaced by a two-equal power distribution circuit, so that the power, amplitude and phase of the first signal of the input coupler and the second signal are better consistent, which greatly reduces the impact of individual differences between amplifiers on the amplification efficiency and improves the consistency of mass production. At the same time, the number of amplifiers used is reduced, the cost is reduced, the area of ​​the circuit is reduced, and thus the volume of the communication device is reduced.

[0061] In the embodiment of the present application, the coupler may be a 3dB coupler. According to the transmission characteristics of the 3dB coupler, there is the following voltage-current function:

[0062]

[0063] Among them, Z O is the characteristic impedance of the 3dB coupler. There is a 90-degree phase difference between the first signal input at the first input terminal of the coupler and the second signal input at the second input terminal, that is,

[0064] I b1 =j*I b2 (2)

[0065] V b1 =j*V b2 (3)

[0066] Combining equations (1), (2) and (3), after conversion and simplification, it can be known that the impedance Z of the first input end of the 3dB coupler is B1 , the impedance Z of the second input of the 3dB coupler B2 , the characteristic impedance Z of the 3dB coupler O , the impedance Z of the isolation end of the 3dB coupler C , which conforms to the following formula:

[0067]

[0068] Z C =Z O (5)

[0069] Among them, I C represents the input current of the isolated end of the 3dB coupler, I C with I b1 The phase difference, I b1 represents the input current at the first input of the 3dB coupler, I b2 represents the input current at the second input terminal of the 3dB coupler.

[0070] as well as,

[0071] P O =P C +P b1 +P b2 (6)

[0072] That is, the output power is equal to the sum of the input power at the first input end of the coupler, the input power at the second input end of the coupler, and the input power at the isolation end of the coupler.

[0073] When I b1 and I b2 In an ideal equilibrium state, I C The impedance is not affected by the power of the bisection power distribution circuit and is always Z O .

[0074] According to the above formula combined with the transmission characteristics of the 3dB coupler, it can be seen that only when the output power and amplitude of the first output end and the second output end of the bisection power distribution circuit are consistent and the phase difference is 90 degrees, the output impedance of the bisection power distribution can remain constant, which is the characteristic impedance Z of the 3dB coupler. O . At the same time, the load Z L The power, that is, the power output by the coupler, can be equal to the sum of the input powers of the first input terminal, the second input terminal and the isolation terminal of the coupler, thereby achieving the high efficiency performance of the active load modulation RF power amplifier circuit.

[0075] The second circuit may further include a second amplifier. The second amplifier starts to work when receiving power and is used to amplify the initial control signal to obtain a control signal. Figure 6 , Figure 6 Another structural schematic diagram of an active load modulated radio frequency power amplifier circuit provided in an embodiment of the present application includes:

[0076] The first amplifier PA1601, the two-division power distribution circuit 602, the sliding rheostat The second amplifier PA2605, 3dB coupler 603, load Z L 606. The output end of the first amplifier 601 is connected to the input end of the halved power distribution circuit 602, the first output end of the halved power distribution circuit 602 is connected to the first input end 11 of the 3dB coupler 603, and the second output end of the halved power distribution circuit 602 is connected to the second input end 12 of the 3dB coupler 603. The sliding rheostat 604 is connected to the input end of the second amplifier 605, and the output end of the second amplifier 605 is connected to the isolation end 13 of the 3dB coupler 603. The output end 14 of the 3dB coupler 603 is connected to the load 606.

[0077] In this embodiment, the first amplifier works in class C, and the second amplifier works in class B or class AB. The resistance value can regulate the control signal. The specific functions of the first amplifier 601, the bisection power distribution circuit 602, the second amplifier 605, the 3dB coupler 603, and the load 606 are as described above and will not be repeated here.

[0078] In the embodiment of the present application, the first amplifier and the second amplifier do not work simultaneously at the beginning. The second amplifier works in Class B or Class AB, so when there is power input, the second amplifier starts to work and amplifies the input initial control signal. The first amplifier works in Class C and works only when the input signal power reaches a set value. Therefore, when the input power is low power, the first amplifier does not work. Only when the second amplifier is close to saturation, the first amplifier starts to work, and as the input power increases, the first amplifier gradually enters saturation.

[0079] When the input signal is a low power signal, because the second amplifier operates in class B or class AB, the second amplifier operates in a saturated state and has high efficiency. At the same time, since the impedance maintains Z in various states, O , will not be affected by high or low power, so it is conducive to broadband design. The first amplifier works in Class C. When the input signal is a low-power signal, the first amplifier does not start working, and the output impedance of the two-way power distribution circuit is close to an open circuit. At this time, the circuit output power is mainly the power of PA1.

[0080] When the input signal is a high-power signal, the second amplifier is still in a saturated working state, with the characteristics of high efficiency and broadband. The first amplifier is gradually turned on to a saturated working state, and at the same time, the output impedance of the two-equal power distribution circuit is gradually reduced by modulation, and the first amplifier gradually reaches a high-efficiency working state. At this time, the first amplifier and the second amplifier both output saturated power and have high efficiency. The output power of the circuit is mainly the total output power of PA1 and PA2.

[0081] In the embodiment of the present application, an amplifier and a two-equal power distribution circuit are used to replace the original set of balanced amplifiers, which reduces the number of amplifiers used, and the total number of amplifiers used is reduced from 3 to 2. While reducing the production cost, it also reduces the impact of individual differences between amplifiers, thereby improving the consistency of mass production and improving production efficiency. In addition, the communication equipment saves more resources as a whole, and reduces considerable production costs, solving the technical problem in the prior art that the need to use three power amplifiers leads to high costs, and the requirements for PCB area are also high, which is contrary to the current trend of communication equipment pursuing low cost and miniaturization.

[0082] The embodiment of the present invention further provides a chip, comprising a first circuit and a second circuit; the first circuit comprises a first amplifier, a 2-equal power distribution circuit and a coupler;

[0083] The output end of the first amplifier is connected to the input end of the bisection power distribution circuit, the first output end of the bisection power distribution circuit is connected to the first input end of the coupler, and the second output end of the bisection power distribution circuit is connected to the second input end of the coupler;

[0084] The output end of the second circuit is connected to the isolation end of the coupler;

[0085] The first amplifier is used to receive and amplify the radio frequency signal;

[0086] The bisection power distribution circuit is used to divide the amplified radio frequency signal into a first signal and a second signal with the same power, and there is a specific phase difference between the first signal and the second signal;

[0087] The second circuit is used to output a control signal;

[0088] The coupler is used to receive the first signal through the first input terminal, receive the second signal through the second input terminal, receive the control signal through the isolation terminal, and output a radio frequency signal through an output terminal.

[0089] In a possible embodiment, the 2-equal power distribution circuit is a 2-equal power divider or a 3dB coupled microstrip circuit.

[0090] In a possible embodiment, the impedance Z of the first input end of the coupler is B1 , the impedance Z of the second input of the coupler B2 , the characteristic impedance Z of the coupler O , the impedance Z of the isolated end of the coupler C , which conforms to the following formula:

[0091]

[0092] Z C =Z O

[0093] Among them, I C represents the input current of the isolated end of the coupler, Indicates I C with I b1 The phase difference, I b1 represents the input current of the first input terminal of the coupler.

[0094] In a possible embodiment, the second circuit includes a second amplifier, and the second amplifier is used to amplify the initial control signal to obtain the control signal.

[0095] In a possible embodiment, the first signal and the second signal have the same amplitude, and a specific phase difference therebetween is 90°.

[0096] In a possible embodiment, when the active load modulation radio frequency power amplifier circuit is in low-power operation, the second circuit is in an operating state, the first circuit is in an open circuit state, and the output signal is the control signal.

[0097] In a possible embodiment, when the active load modulated RF power amplifier circuit is in high-power operation, the first circuit and the second circuit are both in operation, and the output signal is the combined control signal, the first signal, and the second signal.

[0098] In a possible embodiment, the coupler is a 3dB coupler.

[0099] An embodiment of the present invention further provides a communication device, comprising the above chip.

[0100] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0101] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0102] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. An active load modulated radio frequency power amplifier circuit, characterized in that: It includes a first circuit and a second circuit; the first circuit includes a first amplifier, a two-division power distribution circuit and a coupler; The output end of the first amplifier is connected to the input end of the bisection power distribution circuit, the first output end of the bisection power distribution circuit is connected to the first input end of the coupler, and the second output end of the bisection power distribution circuit is connected to the second input end of the coupler; The output end of the second circuit is connected to the isolation end of the coupler; The first amplifier is used to receive and amplify the radio frequency signal; The bisection power distribution circuit is used to divide the amplified radio frequency signal into a first signal and a second signal with the same power, and there is a specific phase difference between the first signal and the second signal; The second circuit is used to output a control signal; The coupler is used to receive the first signal through the first input terminal, receive the second signal through the second input terminal, receive the control signal through the isolation terminal, and output a radio frequency signal through an output terminal.

2. The active load modulated radio frequency power amplifier circuit according to claim 1, characterized in that: The bisection power distribution circuit is a bisection power divider or a 3dB coupled microstrip circuit.

3. The active load modulated radio frequency power amplifier circuit according to claim 1, characterized in that: The impedance Z of the first input terminal of the coupler B1 , the impedance Z of the second input of the coupler B2 , the characteristic impedance Z of the coupler O , the impedance Z of the isolated end of the coupler C , which conforms to the following formula: WITH C =Z O Among them, I C represents the input current of the isolated end of the coupler, Indicates I C with I b1 The phase difference, I b1 represents the input current of the first input terminal of the coupler.

4. The active load modulated radio frequency power amplifier circuit according to claim 1, characterized in that: The second circuit includes a second amplifier, and the second amplifier is used to amplify the initial control signal to obtain the control signal.

5. The active load modulated radio frequency power amplifier circuit according to claim 1, characterized in that: The first signal and the second signal have the same amplitude, and a specific phase difference therebetween is 90°.

6. The active load modulated radio frequency power amplifier circuit according to claim 1, characterized in that: When the active load modulation radio frequency power amplifier circuit is in low power operation, the second circuit is in operation, the first circuit is in an open circuit state, and the output signal is the control signal.

7. The active load modulated radio frequency power amplifier circuit according to claim 1, characterized in that: When the active load modulation radio frequency power amplifier circuit is in high power operation, the first circuit and the second circuit are both in operation, and the output signal is the combined control signal, the first signal and the second signal.

8. The active load modulated radio frequency power amplifier circuit according to any one of claims 1 to 7, characterized in that: The coupler is a 3dB coupler.

9. A chip, characterized in that: It comprises the active load modulation radio frequency power amplifier circuit as described in any one of claims 1 to 8.

10. A communication device, characterized in that: Comprising the chip as claimed in claim 9.

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