Power amplifier circuit structure and electronic equipment

Abstract

The utility model provides a power amplifier circuit structure and electronic equipment, and the power amplifier circuit structure is characterized in that a first LC module, a second LC module and a power amplifier are sequentially connected in series, so that the first LC module and the second LC module generate phase response opposite to that of the power amplifier, the linearity of the power amplifier PA is improved, and the reliability of the power amplifier PA is improved. Therefore, the problems that the requirement of a power amplifier in the prior art is higher and higher, and a scheme for improving the power amplifier in the prior art cannot give consideration to other performances and realize a high-power amplifier are solved.

Description

Technical Field

[0001] The present application relates to the field of power amplifiers in communication technology, and in particular to a power amplifier circuit structure and electronic equipment. Background Art

[0002] With the increasing demand for broadband and high-data-rate communications and the increasing transmission rates of wireless systems, the demand for power amplifiers (PAs) is currently focused on improving PA linearity and efficiency. The key challenge is improving the transmission quality of data-rate signals, which relies on a high peak-to-average ratio (PA). Therefore, signals are often transmitted at a reduced output power level to maintain signal quality. Reducing the back-off output power level improves PA efficiency and operating bandwidth, but only if the transmitted signal is not distorted.

[0003] Currently developed technologies include Doherty power amplifier technology, switch-mode power amplifiers, Chireix power amplifiers, envelope elimination and restoration (EE&R), and envelope tracking power amplifiers. These solutions all aim to improve transmitter efficiency. Doherty power amplifiers improve power amplifier conversion efficiency by changing the modulated load impedance. Doherty power amplifiers integrate APT's multi-stage DC-DC converters, but the gain is not flat across the operating frequency band. Although considerable effort has been made to reduce back-off and lower output power, the performance achieved by Doherty power amplifiers is limited in terms of operating bandwidth. Utility Model Content

[0004] The main purpose of this application is to provide a power amplifier circuit structure and electronic equipment to at least solve the problem that the requirements for power amplifiers in the prior art are getting higher and higher, while the solutions for improving power amplifiers in the prior art cannot take into account other performance and realize high-power amplifiers.

[0005] To achieve the above objectives, according to one aspect of the present application, a power amplifier circuit structure is provided, comprising:

[0006] Power amplifier;

[0007] The analog predistorter includes a first LC module and a second LC module. The first LC module, the second LC module, and the power amplifier are connected in series in sequence. The first LC module and the second LC module are used to generate a phase response opposite to that of the power amplifier to improve the linearity of the power amplifier.

[0008] Optionally, the first LC module includes: a first resistor module and a first capacitor module, the first end of the first resistor module is electrically connected to the first end of the first capacitor module, and the second end of the first resistor module is electrically connected to the second end of the first capacitor module and the input end of the second LC module respectively.

[0009] Optionally, the second LC module includes: a second resistor module and a second capacitor module, the first end of the second resistor module is electrically connected to the output end of the first LC module, the second end of the second resistor module is electrically connected to the first end of the second capacitor module and the input end of the power amplifier respectively, and the second end of the second capacitor module is grounded.

[0010] Optionally, the second LC module includes: a second resistor module and a second capacitor module, the first end of the second resistor module is electrically connected to the output end of the first LC module and the first end of the second capacitor module respectively, the second end of the second resistor module is electrically connected to the input end of the power amplifier, and the second end of the second capacitor module is grounded.

[0011] Optionally, the power amplifier circuit structure further includes: an LLC structure, the LLC structure being electrically connected between the second LC module and the power amplifier, and the LLC structure being configured to generate a notch function corresponding to a frequency of the power amplifier.

[0012] Optionally, the LLC structure includes: a third resistor module, a fourth resistor module and a third capacitor module, the first end of the third resistor module is electrically connected to the output end of the second LC module, the second end of the third resistor module is electrically connected to the input end of the power amplifier and the first end of the fourth resistor module, respectively, the second end of the fourth resistor module is electrically connected to the first end of the third capacitor module, and the second end of the third capacitor module is grounded.

[0013] Optionally, the power amplifier circuit structure further includes: a circuit protection module, the circuit protection module is electrically connected to the input end of the first LC module, and the circuit protection module is used to protect the power amplifier and the analog predistorter.

[0014] Optionally, the first resistance module includes a plurality of resistors connected in series or in parallel.

[0015] Optionally, the first capacitor module includes a plurality of capacitors connected in parallel.

[0016] According to another aspect of the present application, an electronic device is provided, comprising any one of the power amplifier circuit structures described above.

[0017] By applying the technical solution of the present application, the first LC module, the second LC module, and the power amplifier are connected in series in sequence, so that the first LC module and the second LC module produce a phase response opposite to that of the power amplifier, thereby improving the linearity of the power amplifier PA. This solves the problem in the prior art that the requirements for power amplifiers are increasingly higher, while the prior art solutions for improving power amplifiers cannot take into account other performance characteristics and achieve high-power amplifiers. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings that constitute part of this application are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0019] Figure 1 A first schematic diagram of a power amplifier circuit structure provided according to an embodiment of the present application is shown;

[0020] Figure 2 A second schematic diagram showing a power amplifier circuit structure provided according to an embodiment of the present application is shown;

[0021] Figure 3 A schematic diagram of another power amplifier circuit structure provided according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings 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 without making creative efforts should fall within the scope of protection of this application.

[0024] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0025] For ease of description, some nouns or terms involved in the embodiments of the present application are explained below:

[0026] A power amplifier is an electronic device used to increase the power of an input signal and is commonly used in audio, video, and communications systems. A power amplifier converts low-power signals into high-power signals to drive speakers, displays, or other output devices. Common power amplifiers include transistor amplifiers, integrated circuit amplifiers, and power operational amplifiers.

[0027] APT's multi-level DC-DC converter is a power conversion device that converts DC power into different voltage levels. It is usually composed of multiple DC-DC converters in cascade, with each level responsible for converting the input voltage to a different output voltage to meet the needs of different circuits.

[0028] A Doherty power amplifier is a power amplifier design used in wireless communication systems. It achieves high efficiency and high power output by independently controlling the operating states of the main amplifier and auxiliary amplifier. At low power output, only the main amplifier operates; at high power output, both operate simultaneously to improve overall efficiency.

[0029] The Chireix power amplifier is a high-efficiency power amplifier design that maximizes gain and efficiency by using Chireix power combining technology. It combines power modulation and power combining techniques to achieve higher power conversion efficiency and lower distortion. Chireix power amplifiers are commonly used in high-power output applications such as wireless communication systems and radar systems.

[0030] As introduced in the background technology, the Doherty power amplifier in the prior art integrates the multi-stage DC-DC converter of APT, but the gain is not flat on the operating frequency band. Although a lot of work has been done to reduce the back-off and lower the output power, the performance achieved by the Doherty power amplifier is limited in terms of the operating bandwidth. In order to solve the problem that the requirements for power amplifiers in the prior art are getting higher and higher, and the solutions for improving power amplifiers in the prior art cannot take into account other performance and realize high-power amplifiers, the embodiments of the present application provide a power amplifier circuit structure and electronic equipment.

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0032] A power amplifier circuit structure is provided in this embodiment. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0033] Figure 1 FIG. 1 is a flow chart of a power amplifier circuit structure according to an embodiment of the present application. Figure 1 As shown, the structure includes:

[0034] Power amplifier PA;

[0035] The analog predistorter (APD) includes a first LC module LC1 and a second LC module LC2. The first LC module LC1, the second LC module LC2, and the power amplifier (PA) are connected in series. The first LC module LC1 and the second LC module LC2 are configured to generate a phase response opposite to that of the power amplifier (PA) to improve the linearity of the power amplifier (PA).

[0036] In the power amplifier circuit structure, the first LC module, the second LC module, and the power amplifier are connected in series, thereby causing the first LC module and the second LC module to produce a phase response opposite to that of the power amplifier, thereby improving the linearity of the power amplifier PA. This solves the problem in the prior art that the requirements for power amplifiers are increasingly high, while the prior art solutions for improving power amplifiers cannot take into account other performance characteristics and achieve high power amplifiers.

[0037] Specifically, the analog predistorter (APD) provides opposite phase responses at the RF input through the first LC module LC1 and the second LC module LC2, helping to achieve low distortion while compensating for inherently nonlinear active signals. The APD must generate opposite phases to suppress spectral sideband regrowth. This inverse phase response determines the output power between the quantized APD and the main amplifier. Therefore, the APD is integrated into the gate of the cascode power amplifier (PA) to improve its linearity.

[0038] In one embodiment of the present application, Figure 3 As shown, the second LC module LC2 includes a second resistance module R2 and a second capacitance module C2.

[0039] The first end of the second resistor module R2 is electrically connected to the output end of the first LC module LC1, the second end of the second resistor module R2 is electrically connected to the first end of the second capacitor module C2 and the input end of the power amplifier respectively, and the second end of the second capacitor module C2 is grounded.

[0040] Specifically, the first resistor module R1 is composed of multiple resistors, which can be configured in series or in parallel to meet different circuit requirements. The configuration of the resistors not only affects the stability of the circuit, but also determines the attenuation characteristics of the signal to a certain extent. The first capacitor module C1 is composed of multiple capacitors in parallel. The selection and configuration of capacitors are crucial for signal filtering, energy storage, and phase adjustment. In this embodiment, multiple capacitors are used in parallel to increase the capacitance value, thereby more effectively suppressing high-frequency noise and stray signals.

[0041] In one embodiment of the present application, Figure 3 As shown, the first LC module LC1 includes a first resistance module R1 and a first capacitance module C1.

[0042] The first end of the first resistor module R1 is electrically connected to the first end of the first capacitor module C1 , and the second end of the first resistor module R1 is electrically connected to the second end of the first capacitor module C1 and the input end of the second LC module LC2 .

[0043] The first resistance module R1 includes a plurality of resistors connected in series or in parallel, and the first capacitance module C1 includes a plurality of capacitors connected in parallel.

[0044] Specifically, the second resistor module R2 and the second capacitor module C2 not only improve the linearity performance of the power amplifier PA, but also enhance the spurious suppression capability, optimize the radio frequency debugging process, and meet the requirements of miniaturization of wireless communication equipment.

[0045] In one embodiment of the present application, Figure 2 As shown, the second LC module LC2 includes a second resistance module R2 and a second capacitance module C2.

[0046] The first end of the second resistor module R2 is electrically connected to the output end of the first LC module LC1 and the first end of the second capacitor module C2 respectively, the second end of the second resistor module R2 is electrically connected to the input end of the power amplifier PA, and the second end of the second capacitor module C2 is grounded.

[0047] Specifically, the second resistor module R2 and the second capacitor module C2 cooperate to simulate a distorter that generates a phase response opposite to that of the power amplifier PA. This opposite phase response helps offset the nonlinear distortion generated by the power amplifier PA, thereby significantly improving the linearity of the power amplifier PA.

[0048] In one embodiment of the present application, Figure 2 As shown, the power amplifier PA circuit structure also includes an LLC structure LLC1,

[0049] The LLC structure LLC1 is electrically connected between the second LC module LC2 and the power amplifier PA. The LLC structure LLC1 is used to generate a notch function corresponding to a frequency of the power amplifier PA.

[0050] Specifically, in the LTE system, ACLR (adjacent channel leakage) is a key indicator for measuring the linearity of terminal transmission, in-band and out-band spurious signals will affect the entire wireless communication system network environment, and power consumption is the indicator that terminal customers are most concerned about. The LLC notch structure can optimize in-band and out-band spurious signals.

[0051] In one embodiment of the present application, Figure 2 As shown, the LLC structure LLC1 includes: a third resistor module R3, a fourth resistor module R4 and a third capacitor module C3,

[0052] The first end of the third resistor module R3 is electrically connected to the output end of the second LC module LC2, the second end of the third resistor module R3 is electrically connected to the input end of the power amplifier PA and the first end of the fourth resistor module R4, respectively, the second end of the fourth resistor module R4 is electrically connected to the first end of the third capacitor module C3, and the second end of the third capacitor module C3 is grounded.

[0053] Specifically, the series-parallel LLC is responsible for generating a notch function at the corresponding frequency, thereby suppressing the occurrence of intermodulation products as much as possible to improve the linearity of the power amplifier PA, while also optimizing the in-band and out-of-band spurious indicators of the transmission band.

[0054] In one embodiment of the present application, Figure 2 As shown, the power amplifier PA circuit structure further includes a circuit protection module C4,

[0055] The circuit protection module C4 is electrically connected to the input end of the first LC module LC1 , and the circuit protection module C4 is used to protect the power amplifier PA and the analog predistorter APD.

[0056] Specifically, the circuit protection module can be a capacitor, making the power amplifier (PA) circuit structure more adaptable to complex and changing communication environments, improving system robustness. The circuit protection module can also effectively prevent circuit damage caused by abnormal conditions such as overvoltage and overcurrent, thereby improving the stability of the entire power amplifier (PA) circuit structure.

[0057] The above embodiments can effectively solve the problem of limited high linearity performance of the amplifier, and are perfectly adapted to the LTE multi-band power amplifier PA. They can meet the power amplifier PA requirements of the LTE system, greatly improve the linearity of the power amplifier PA, provide more debugging space during RF debugging, greatly reduce the difficulty of RF debugging, and also take into account the suppression of nonlinear products within and outside the transmission band of the LTE system and various emission indicators.

[0058] The present application also provides an electronic device comprising any one of the above-mentioned power amplifier circuit structures.

[0059] It should be noted that the above electrical connection can be a direct electrical connection or an indirect electrical connection. Direct electrical connection means that two devices are directly connected, and indirect electrical connection means that other devices such as capacitors and resistors are connected between the connected A and B.

[0060] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

[0061] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0062] 1) In the power amplifier circuit structure of the present application, the first LC module, the second LC module, and the power amplifier are connected in series in sequence, so that the first LC module and the second LC module produce a phase response opposite to that of the power amplifier, thereby improving the linearity of the power amplifier PA. This solves the problem in the prior art that the requirements for power amplifiers are increasingly high, while the prior art solutions for improving power amplifiers cannot take into account other performance characteristics and achieve high power amplifiers.

[0063] 2) In the electronic device of the present application, since the first LC module, the second LC module and the power amplifier are connected in series in sequence, the first LC module and the second LC module produce a phase response opposite to that of the power amplifier, thereby improving the linearity of the power amplifier PA, thereby solving the problem that the requirements for power amplifiers in the prior art are increasingly higher, while the solutions for improving power amplifiers in the prior art cannot take into account other performance and realize high-power amplifiers.

[0064] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A power amplifier circuit structure, characterized in that: include: Power amplifier; The analog predistorter includes a first LC module and a second LC module. The first LC module, the second LC module, and the power amplifier are connected in series in sequence. The first LC module and the second LC module are used to generate a phase response opposite to that of the power amplifier to improve the linearity of the power amplifier.

2. The power amplifier circuit structure according to claim 1, wherein: The first LC module includes: a first resistor module and a first capacitor module, the first end of the first resistor module is electrically connected to the first end of the first capacitor module, and the second end of the first resistor module is electrically connected to the second end of the first capacitor module and the input end of the second LC module respectively.

3. The power amplifier circuit structure according to claim 1, wherein: The second LC module includes: a second resistor module and a second capacitor module, the first end of the second resistor module is electrically connected to the output end of the first LC module, the second end of the second resistor module is electrically connected to the first end of the second capacitor module and the input end of the power amplifier respectively, and the second end of the second capacitor module is grounded.

4. The power amplifier circuit structure according to claim 1, wherein: The second LC module includes: a second resistor module and a second capacitor module, the first end of the second resistor module is electrically connected to the output end of the first LC module and the first end of the second capacitor module respectively, the second end of the second resistor module is electrically connected to the input end of the power amplifier, and the second end of the second capacitor module is grounded.

5. The power amplifier circuit structure according to claim 1, wherein: The power amplifier circuit structure further includes an LLC structure, which is electrically connected between the second LC module and the power amplifier. The LLC structure is used to generate a notch function corresponding to the frequency of the power amplifier.

6. The power amplifier circuit structure according to claim 5, characterized in that: The LLC structure includes: a third resistor module, a fourth resistor module and a third capacitor module, wherein the first end of the third resistor module is electrically connected to the output end of the second LC module, the second end of the third resistor module is electrically connected to the input end of the power amplifier and the first end of the fourth resistor module, respectively, the second end of the fourth resistor module is electrically connected to the first end of the third capacitor module, and the second end of the third capacitor module is grounded.

7. The power amplifier circuit structure according to claim 1, wherein: The power amplifier circuit structure further includes: a circuit protection module, which is electrically connected to the input end of the first LC module and is used to protect the power amplifier and the analog predistorter.

8. The power amplifier circuit structure according to claim 2, wherein: The first resistance module includes a plurality of resistors connected in series or in parallel.

9. The power amplifier circuit structure according to claim 2, wherein: The first capacitor module includes a plurality of capacitors connected in parallel.

10. An electronic device, characterized in that: include: The power amplifier circuit structure according to any one of claims 1 to 6.

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