Power amplification circuit, communication device and system

Abstract

This specification provides embodiments of a power amplifier circuit, communication equipment, and system. The circuit includes a power amplifier module, a peak detection module, and a bias adjustment module. The power amplifier module includes a main power amplifier unit and an auxiliary power amplifier unit. The peak detection module detects a first peak voltage output by the main power amplifier unit and a second peak voltage output by the auxiliary power amplifier unit, and outputs the first and second peak voltages to the bias adjustment module. The bias adjustment module determines the power point information corresponding to the auxiliary power amplifier unit based on the first and second peak voltages, and adjusts the bias voltage of the auxiliary power amplifier unit based on the power point information. This improves the linearity of the power amplifier circuit under load mismatch conditions and enhances its robustness to different load application scenarios.

Description

Technical Field

[0001] This specification relates to the field of wireless communication technology, and in particular to a power amplifier circuit, communication device and system. Background Technology

[0002] As the final active circuit stage in a millimeter-wave transmitter, the power amplifier bears the heavy responsibility of determining performance indicators such as efficiency, power, and linearity. Typically, the power amplifier (or simply amp) accounts for more than half of the total DC power consumption of the entire transmitter link. Therefore, efficiency is a key performance indicator for evaluating the quality of a power amplifier. To improve the efficiency of power amplifiers, many key technologies have emerged, such as Kahn envelope separation and recovery technology, envelope tracking technology, and Doherty technology. Among them, Doherty technology, by using a main power amplifier and an auxiliary power amplifier and introducing load tuning technology, achieves high power, high efficiency, and high back-off efficiency, and has gained widespread industry recognition.

[0003] Doherty power amplifiers are a type of power amplifier consisting of a carrier path and a peak path. This type of amplifier can output power through the peak path when high power is required, achieving good linearity. In low-power operation, only the carrier path operates, saving power and improving amplifier efficiency. However, Doherty power amplifiers are quite sensitive to load changes. Their linearity performance is significantly affected by load variations. Therefore, improving the robustness of Doherty power amplifiers to load impedance becomes particularly important. Utility Model Content

[0004] In view of this, this specification provides a power amplifier circuit to address the problem of poor robustness of Doherty power amplifiers to load impedance in the prior art.

[0005] According to a first aspect of the embodiments of this specification, a power amplifier circuit is provided, including a power amplifier module, a peak detection module, and a bias adjustment module;

[0006] The power amplifier module includes a main power amplifier unit and an auxiliary power amplifier unit. The peak detection module is used to detect the first peak voltage output by the main power amplifier unit and the second peak voltage output by the auxiliary power amplifier unit, and output the first peak voltage and the second peak voltage to the bias adjustment module.

[0007] The bias adjustment module is used to determine the power point information corresponding to the auxiliary power amplifier unit based on the first peak voltage and the second peak voltage, and to adjust the bias voltage of the auxiliary power amplifier unit based on the power point information.

[0008] According to a second aspect of the embodiments of this specification, a communication device is provided, the device including the power amplifier circuit described above, and a signal transceiver unit connected to the power amplifier circuit;

[0009] The power amplifier circuit is used to amplify the initial radio frequency signal to obtain the target radio frequency signal corresponding to the initial radio frequency signal, and output the target radio frequency signal to the signal transceiver unit.

[0010] According to a third aspect of the embodiments of this specification, a communication system is provided, the system including the above-described communication device and a transceiver device having a communication relationship with the communication device;

[0011] The communication device is used to send a target radio frequency signal to the transceiver device.

[0012] One embodiment of this specification implements the addition of a peak detection module and a bias adjustment module to a power amplifier circuit. The peak detection module detects the first peak voltage of the main power amplifier unit and the second peak voltage of the auxiliary power amplifier unit, and outputs the results to the bias adjustment module. The bias adjustment module determines the power point information of the auxiliary power amplifier unit based on the first and second peak voltages, and adjusts the bias voltage of the auxiliary power amplifier unit based on the power point information. This allows for the determination of the power point information of the auxiliary power amplifier unit based on the first and second peak voltages, thereby identifying the compression power point of the main power amplifier unit and the turn-on power point of the auxiliary power amplifier unit. By dynamically adjusting the bias voltage of the auxiliary power amplifier unit using the power point information, the compression power point of the main power amplifier unit and the turn-on power point of the auxiliary power amplifier unit are matched as closely as possible. This improves the linearity of the power amplifier circuit under load mismatch conditions and enhances the robustness of the power amplifier circuit to different load application scenarios. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the basic architecture of a conventional power amplifier provided in this manual;

[0014] Figure 2 This is a schematic diagram of the architecture of a power amplifier circuit according to one embodiment of this specification;

[0015] Figure 3A This is a schematic diagram of a simulation curve of a conventional power amplifier circuit provided in this manual;

[0016] Figure 3B This is a schematic diagram of a simulation curve of a power amplifier circuit provided in one embodiment of this specification;

[0017] Figure 4 This specification shows a schematic diagram of the structure of a communication device according to one embodiment;

[0018] Figure 5 A schematic diagram of the structure of a communication system provided in one embodiment of this specification is shown.

[0019] Figure Labels

[0020] Power amplifier module-202; Main power amplifier unit-2022; Auxiliary power amplifier unit-2024; Peak detection module-204; First peak detection circuit-2042; Second peak detection circuit-2044; Offset adjustment module-206; Power divider-208; Offset output module-210; Power combiner-212. Detailed Implementation

[0021] Many specific details are set forth in the following description to provide a full understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of this application; therefore, this application is not limited to the specific embodiments disclosed below.

[0022] The terminology used in one or more embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the scope of one or more embodiments of this application. The singular forms “a,” “the,” and “the” used in one or more embodiments of this application and in the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” used in one or more embodiments of this application refers to and includes any or all possible combinations of one or more associated listed items.

[0023] It should be understood that although the terms first, second, etc., may be used to describe various information in one or more embodiments of this application, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, first may also be referred to as second without departing from the scope of one or more embodiments of this application, and similarly, second may also be referred to as first. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to a determination."

[0024] First, the terms and concepts involved in one or more embodiments of this application will be explained.

[0025] Doherty power amplifiers are circuit structures specifically designed to improve the amplification efficiency of radio frequency (RF) signals. They are widely used in modern wireless communication systems, particularly in applications requiring high efficiency and good linearity, such as cellular base stations, satellite communications, and broadcast transmitters. A Doherty amplifier typically consists of two power amplifiers: a carrier amplifier (CA) and a peak amplifier (PA). These two amplifiers are connected together via a special load modulation network to achieve efficient power amplification. See also... Figure 1 , Figure 1 This manual provides a basic schematic diagram of a conventional power amplifier architecture. After the signal input, it is split into two paths by a power divider, which feeds the signal to the carrier amplifier (Carrier PA) and the peak amplifier (Peak PA) respectively. Then, the signal is combined by a power combiner and output to the antenna load. The advantage of Doherty PA is that it can improve efficiency and save power consumption during low-power transmission.

[0026] Radio frequency (RF) power amplifiers are commonly used RF circuit devices for amplifying and increasing the output power of RF signals. They are widely used in various fields such as the Internet of Things (IoT), communication base stations, small base stations, repeaters, test instruments, radar, and WiFi. RF power amplifiers are essential key components in RF transmission systems. Their performance directly affects the signal strength and quality of the transmission system. Linearity is one of the key indicators of a power amplifier; good linearity is crucial for the complete and effective transmission of signals. Doherty power amplifiers, a type of power amplifier, consist of two paths: a carrier path and a peak path. This type of amplifier can output power through the peak path when high power is required, achieving good linearity. In low-power operation, only the carrier path operates, saving power and improving amplifier efficiency. The linearity of power amplifiers is easily affected by the load. In actual transmission systems, the impedance of the antenna following the power amplifier is not a fixed 50 ohms but can vary significantly. This can greatly affect the performance of the power amplifier, especially Doherty power amplifiers, which are particularly sensitive to load changes. When the load changes, the linearity performance is significantly affected.

[0027] Based on this, this application provides a power amplifier circuit designed to provide robustness of the power amplifier in the face of different load application scenarios, which will be described in detail in the following embodiments.

[0028] See Figure 2 , Figure 2This is a schematic diagram of the architecture of a power amplifier circuit according to an embodiment of this specification. The circuit includes a power amplifier module 202, a peak detection module 204, and a bias adjustment module 206.

[0029] The power amplifier module 202 includes a main power amplifier unit 2022 and an auxiliary power amplifier unit 2024. The peak detection module 204 is used to detect the first peak voltage output by the main power amplifier unit 2022 and the second peak voltage output by the auxiliary power amplifier unit 2024, and output the first peak voltage and the second peak voltage to the bias adjustment module 206.

[0030] The bias adjustment module 206 is used to determine the power point information corresponding to the auxiliary power amplifier unit 2024 based on the first peak voltage and the second peak voltage, and to adjust the bias voltage of the auxiliary power amplifier unit 2024 based on the power point information.

[0031] In practical applications, a power amplifier circuit can be understood as a Doherty power amplifier. In the embodiments of this specification, based on a Doherty power amplifier, a peak detection module and a bias adjustment module are added to realize the detection of the peak voltage of the main power amplifier unit and the auxiliary power amplifier unit. The first peak voltage detected by the first peak detection circuit in the peak detection module and the second peak voltage detected by the second peak detection circuit determine the power point information corresponding to the auxiliary power amplifier unit. The bias voltage of the auxiliary power amplifier unit is dynamically adjusted using the power point information. Thus, the linearity and robustness of the power amplifier circuit are improved by dynamically adjusting the bias voltage of the auxiliary power amplifier unit when the power amplifier is mismatched with the load.

[0032] The main power amplifier unit can be understood as the carrier amplifier (Carrier PA) in a power amplifier circuit (hereinafter referred to as power amplifier), while the auxiliary power amplifier unit can be understood as the peak amplifier (Peak PA) in a power amplifier. These two amplifiers are connected together through a special load modulation network to achieve efficient power amplification. Its basic working process is as follows:

[0033] Low power level: When the input signal is weak, only the carrier amplifier is active, while the peak amplifier is off. In this state, the overall amplifier efficiency is high.

[0034] Medium power level: As the input signal strength increases, the carrier amplifier gradually approaches the saturation point. At this point, the load modulation network begins to function, changing the load impedance seen by the carrier amplifier so that it can output more power without distortion.

[0035] High power level: When the input signal reaches a certain strength, the peak amplifier is also activated, and together with the carrier amplifier, it undertakes the power amplification task, thereby being able to handle higher signal peaks and ensuring the linearity of the system.

[0036] However, in traditional power amplifiers, by fixing the bias voltages of the carrier amplifier and the peak amplifier, the turn-on power point of the peak amplifier and the compression power point of the carrier amplifier will become mismatched when the load impedance changes. This causes the peak amplifier to turn on ahead or behind, resulting in a deterioration in the linearity of the power amplifier under these circumstances.

[0037] Based on this, this specification provides a power amplifier that uses a peak detection module to detect the first peak voltage output by the main power amplifier unit and the second peak voltage output by the auxiliary power amplifier unit in real time. Based on the first and second peak voltages, the power point information corresponding to the auxiliary power amplifier unit is determined, and the bias voltage of the auxiliary power amplifier unit is adjusted based on the power point information to make the turn-on power point of the auxiliary power amplifier unit as close as possible to the compression power point of the main power amplifier unit. This improves the linearity of the power amplifier under load mismatch conditions and greatly enhances the robustness of the power amplifier in different load application scenarios.

[0038] Furthermore, the circuit includes a power divider 208; the power divider 208 is used to receive an input signal, divide the input signal to obtain a first input signal corresponding to the main power amplifier unit 2022 and a second input signal corresponding to the auxiliary power amplifier unit 2024, transmit the first input signal to the main power amplifier unit 2022, and transmit the second input signal to the auxiliary power amplifier unit 2024.

[0039] In this context, a power divider can be understood as a component in a power amplifier used to divide the signal. The power divider splits the input signal received by the power amplifier into two paths: a first input signal corresponding to the main power amplifier unit and a second input signal corresponding to the auxiliary power amplifier unit. The first input signal is the signal fed to the main power amplifier unit, and the second input signal is the signal fed to the auxiliary power amplifier unit.

[0040] In practical applications, the main task of a power divider is to split the input signal into two equal parts, which are then fed to a carrier amplifier and a peak amplifier, respectively. Typically, power dividers are designed with a 50% power distribution, meaning each amplifier receives half of the input power. However, in some designs, different power distribution ratios (e.g., 60 / 40 or 70 / 30) may be used to optimize performance. Common power dividers include Wilkinson power dividers, hybrid ring couplers, and branch-line couplers.

[0041] In practical implementation, within a power amplifier, the power divider not only needs to perform the task of power distribution, i.e., signal division, but also needs to ensure the following:

[0042] Phase consistency: To achieve load modulation, a 90-degree phase difference must be maintained between the input signals of the carrier amplifier and the peak amplifier. Therefore, the power divider needs precise phase control capabilities. Incorrect phase difference may lead to load modulation failure, thereby affecting the amplifier's efficiency and linearity.

[0043] Amplitude balance: The power divider should ensure that the amplitudes of the two output signals are as consistent as possible.

[0044] Broadband characteristics: Modern communication systems typically need to support multiple frequency bands, so power dividers should have good broadband characteristics to adapt to different operating frequency ranges.

[0045] Based on this, the power divider receives the input signal, which is the signal that the power amplifier circuit needs to amplify. The power divider divides the input signal to obtain the first input signal for output to the main power amplifier unit and the second input signal for output to the auxiliary power amplifier unit.

[0046] Furthermore, the circuit includes a bias output module 210; the bias output module 210 is used to transmit a first bias voltage of the main power amplifier unit 2022 to the main power amplifier unit 2022, and a second bias voltage of the auxiliary power amplifier unit 2024 to the bias adjustment module 206, wherein the first bias voltage is used to place the main power amplifier unit 2022 in a first preset bias state, and the second bias voltage is used to place the auxiliary power amplifier unit 2024 in a second preset bias state; the main power amplifier unit 2022 is used to amplify the first input signal based on the fixed bias voltage to obtain a first amplified signal.

[0047] The bias output module can be understood as a module that provides bias voltage to each power amplifier unit in the power amplifier module. In practical applications, the bias output module is a bias circuit used to provide bias voltage to the carrier amplifier and the peak amplifier, so that both the carrier amplifier and the peak amplifier are in a suitable bias state.

[0048] In practical implementation, a first bias voltage is provided to the main power amplifier unit through the bias output module, enabling the main power amplifier unit to be in a first preset bias state. This first preset bias state can be understood as the bias state corresponding to the main power amplifier unit. Since the main power amplifier unit needs to process relatively weak input signals, it needs to be biased in Class B or Class AB. In Class B or Class AB operating mode, the transistor is only turned on for half of a signal cycle (i.e., a 180-degree conduction angle). This type of amplifier is typically used in applications requiring high-efficiency conversion because they can theoretically be completely turned off when there is no signal input, thus reducing static power consumption. Therefore, by providing a first bias voltage to the main power amplifier unit through the bias output module, the main power amplifier unit is placed in the first preset bias state. The main power amplifier unit can then amplify the first input signal when the signal is weak, obtaining the first amplified signal.

[0049] In the power amplifier circuit provided in this specification, since the bias voltage of the auxiliary power amplifier unit needs to be dynamically adjusted, the bias output module transmits the second bias voltage corresponding to the auxiliary power amplifier unit to the bias adjustment module. The bias adjustment module then determines whether to adjust the second bias voltage corresponding to the auxiliary power amplifier unit based on the currently detected peak voltage. The bias adjustment module then transmits the bias voltage (adjusted or unadjusted) to the auxiliary power amplifier unit, placing it in a second preset bias state. This second preset bias state can be understood as the bias state corresponding to the auxiliary power amplifier unit. Because the auxiliary power amplifier module is biased in Class C, and the conduction angle of a Class C amplifier is less than 180 degrees, typically only around 50 to 70 degrees, this means that the transistor is in the off state for most of each signal cycle, only turning on rapidly during peak periods. Therefore, when the signal is small, the auxiliary power amplifier unit does not amplify the signal. As the power gradually increases, the auxiliary power amplifier will amplify the signal during some signal cycles. The second bias voltage is adjusted by the bias adjustment module and transmitted to the auxiliary power amplifier unit so that the auxiliary power amplifier unit can be turned on when the gain of the main power amplifier unit is just limited, thereby improving the linearity of the entire power amplifier.

[0050] Based on this, a fixed first bias voltage is output to the main power amplifier unit via the bias output module. This allows the main power amplifier unit to be biased in an appropriate state based on the first bias voltage. When the input signal is small, i.e., when the system needs to output low power, only the main power amplifier unit, i.e., the carrier amplifier, operates, providing good linearity at low to medium power output. A second bias voltage for the auxiliary power amplifier unit is output to the bias adjustment module via the bias output module. Subsequently, the bias adjustment module dynamically adjusts the bias voltage of the auxiliary power amplifier unit, allowing it to be biased in an appropriate state based on the adjusted second bias voltage, thereby amplifying the input signal. This ensures that even when the power amplifier faces load mismatch, the matching degree between the turn-on power point of the auxiliary power amplifier unit (i.e., the peak amplifier) ​​and the compression power point of the carrier amplifier is maintained, reducing nonlinear distortion caused by load mismatch and thus improving the overall system signal quality.

[0051] Furthermore, the bias adjustment module 206 is used to determine the compression power point of the main power amplifier unit 2022 based on the first peak voltage, and to determine the activation power point of the auxiliary power amplifier unit 2024 based on the second peak voltage, and to use the compression power point and the activation power point as the power point information of the auxiliary power amplifier unit.

[0052] The peak detection module 204 includes a first peak detection circuit 2042 and a second peak detection circuit 2044. The first peak detection circuit 2042 detects the peak voltage of the main power amplifier unit to obtain a first peak voltage; the second peak detection circuit 2044 detects the peak voltage of the auxiliary power amplifier unit to obtain a second peak voltage. The power compression point can be understood as the power compression point of the carrier amplifier. The power compression point refers to the point at which the output of the carrier amplifier begins to deviate from the ideal linear gain when the input signal increases to a certain level, i.e., it enters the nonlinear region or compression region. This is usually expressed as a 1dB compression point, which is the input power level when the output power decreases by 1dB relative to the linear gain. The power compression point indicates that the carrier amplifier is about to, or has already begun to, lose linear amplification of the signal. To process larger signals without distortion, it is necessary to activate the peak amplifier to share some of the power demand.

[0053] The power point of activation (PPO) can be understood as the activation power point of a peak amplifier. The PPO refers to the point at which the peak amplifier switches from a closed state to a closed state and begins participating in the signal amplification process when the input signal strength reaches a certain threshold. Activating the PPO provides additional gain and output capability, allowing the power amplifier to maintain good linearity even at high power levels. Precise control of this PPO optimizes the overall efficiency and performance of the amplifier. Therefore, in the power amplifier circuit provided in this specification, the power point information is determined by detecting the peak voltage of the amplifier. This power point information includes the compression power point of the main power amplifier unit and the activation power point of the auxiliary power amplifier unit. The compression power point and the activation power point are used as the power point information for the auxiliary power amplifier unit to facilitate subsequent adjustment of the bias voltage of the auxiliary power amplifier unit based on this power point information.

[0054] In a specific embodiment of this specification, the compression power point of the main power amplifier unit may change due to variations in load impedance. When the main power amplifier unit is close to its maximum output capability as determined by the first peak voltage (e.g., the detected first peak voltage reaches a preset voltage threshold), it indicates that the input signal strength is too high, and the main power amplifier unit has approached or reached its compression power point. At this time, it is necessary to activate the auxiliary power amplifier unit to process stronger signals. If the auxiliary power amplifier unit is activated based on a fixed bias voltage, it may activate prematurely or delayedly, causing the main power amplifier unit to enter a deep compression region, resulting in a decrease in linearity. Therefore, the auxiliary power amplifier unit is activated based on the second peak voltage to determine its activation power point. The bias voltage of the auxiliary power amplifier unit is adjusted by matching the compression power point and the activation power point, so that the compression power point and the activation power point can be matched as closely as possible even when there is a load mismatch.

[0055] Furthermore, the bias adjustment module is used to adjust the second bias voltage based on the compression power point and the turn-on power point to obtain the adjusted second bias voltage corresponding to the auxiliary power amplifier unit, wherein the adjusted second bias voltage is used to adjust the turn-on power point corresponding to the auxiliary power amplifier unit; the auxiliary power amplifier unit is used to amplify the second input signal based on the adjusted second bias voltage to obtain the second amplified signal.

[0056] After determining the compression power point and the activation power point, the second bias voltage corresponding to the auxiliary power amplifier unit can be adjusted based on the compression power point and the activation power point to obtain the adjusted second bias voltage. The adjusted second bias voltage can change the activation power point of the auxiliary power amplifier unit, so that the activation power point of the auxiliary power amplifier unit can match the compression power point of the main power amplifier unit. The adjusted second bias voltage enables the auxiliary power amplifier unit to enter the working state at the activation power point, thereby amplifying the second input signal and obtaining the second amplified signal.

[0057] In practical applications, the compression power point (CPP) determines whether the main power amplifier unit has entered the nonlinear or compression region. The turn-on power point (TPP) then determines whether the auxiliary power amplifier unit is operational. To ensure the auxiliary power amplifier unit accurately enters the operational state at the CPP, its bias voltage (i.e., the second bias voltage) needs to be adjusted. The auxiliary power amplifier unit, i.e., the peak amplifier, is generally designed for Class C operation. Before reaching the TPP, it is in a closed or low-power state. Due to load mismatch, the carrier amplifier may reach the CPP earlier or later. By decreasing the second bias voltage (if the initial setting is high) or increasing it (if the initial setting is low), the TPP can be adjusted to match the carrier amplifier's TPP even when the CPP changes, ensuring that the CPP and TPP match even under load mismatch conditions. The adjusted second bias voltage then enables the peak amplifier to conduct and participate in amplification. The bias voltage determined after these adjustments, which allows the peak amplifier to accurately turn on and operate normally, is called the adjusted second bias voltage. The adjusted second bias voltage ensures that the peak amplifier effectively amplifies the signal at the required power level without affecting the overall system efficiency and linearity. Once the peak amplifier receives the adjusted second bias voltage, it amplifies the second input signal (i.e., the portion of the signal that exceeds the processing capability of the carrier amplifier alone), generating a second amplified signal. This is done to maintain good signal quality and amplification efficiency even under high power output demands.

[0058] Based on this, by reasonably setting and adjusting the bias voltage of the auxiliary power amplifier unit, the overall performance of the power amplifier can be effectively improved, including efficiency, linearity, and the ability to handle high peak signals.

[0059] Furthermore, the circuit includes a power combiner 212; the power combiner 212 is used to receive the first amplified signal and the second amplified signal, and to perform synthesis processing on the first amplified signal and the second amplified signal to obtain the output amplified signal corresponding to the input signal.

[0060] The power combiner is a key component in the power amplifier, used to combine the received first and second amplified signals to obtain the output amplified signal of the power amplifier.

[0061] In practical applications, a power combiner effectively combines the first amplified signal from the carrier amplifier and the second amplified signal from the peak amplifier. These two signals represent the amplification results of the input signal under different operating conditions, producing the final amplified output signal. Specifically, through a precisely designed matching network and transmission line (such as a λ / 4 transmission line), the power combiner ensures that the output signals of the two amplifiers are in phase and that their load impedances are suitable for their respective optimal operating conditions. Thus, the combined output signal retains the high efficiency of the carrier amplifier at low power levels while utilizing the additional gain provided by the peak amplifier to meet high power demands, achieving a smooth transition and efficient amplification.

[0062] Compared to traditional power amplifier circuits, the power amplifier circuit provided in this manual can significantly improve the linearity of the power amplifier under load mismatch conditions. The following simulation data illustrates the corresponding performance of the power amplifier circuit provided in this manual. Refer to Table 1, which compares the OP1dB of the fixed-configuration power amplifier circuit and the dynamically biased power amplifier circuit provided in this manual under different load impedances.

[0063] Table 1

[0064]

[0065] OP1dB, or Output Power at 1dB compression, refers to the output power level at which the actual gain of the power amplifier decreases by 1dB compared to its small-signal gain when the input signal strength increases to a certain level. This parameter directly reflects the power amplifier's performance in maintaining linear amplification capability. A higher OP1dB value means that the PA can maintain linear operation at a higher output power level, which is crucial for ensuring the clarity of the communication system and reducing interference. Table 1 shows that under load matching conditions (e.g., a 50-ohm load), the linearity of a conventional architecture using a fixed bias power amplifier is no different from that of the dynamically biased power amplifier provided in this specification. However, under load mismatch conditions (e.g., 50-35 ohms), the power amplifier circuit provided in this specification can improve linearity under various load conditions, especially under loads where linearity deteriorates significantly, where a substantial improvement in linearity can be achieved.

[0066] See Figure 3A , Figure 3A This is a simulation curve diagram of a conventional power amplifier circuit provided in this manual. See also... Figure 3B , Figure 3BThis is a schematic diagram of a simulation curve of a power amplifier circuit provided in one embodiment of this specification. Wherein, Pout_1st represents the output power, and Pin represents the input power. P1dB represents the degree to which the gain deviates from the low-power gain; the output power at which the deviation reaches 1dB is considered the value of OP1dB. From... Figure 3A As can be seen, the OP1dB of a traditional power amplifier circuit is only 32dBm. Figure 3B As can be seen from this, the OP1dB of the power amplifier circuit provided in this manual has been increased to 37dBm, which is 5dB higher than that of the traditional power amplifier circuit, thus improving the load robustness of the power amplifier's linearity.

[0067] See Figure 4 , Figure 4 A schematic diagram of a communication device provided in one embodiment of this specification is shown. The device communication 40 includes the power amplifier circuit 402 described above, and a signal transceiver unit 404 connected to the power amplifier circuit 402. The power amplifier circuit 402 is used to amplify an initial radio frequency signal to obtain a target radio frequency signal corresponding to the initial radio frequency signal, and output the target radio frequency signal to the signal transceiver unit 404.

[0068] In practical applications, power amplifier circuits, as core components of wireless communication systems, are primarily used to amplify the power of radio frequency signals to meet the requirements of transmission distance, signal strength, and coverage. Their applications are very broad, covering multiple fields from consumer electronics to industrial equipment and defense communications. Communication equipment is simply a device equipped with the aforementioned power amplifier circuit, possessing wireless transceiver capabilities. The corresponding communication equipment varies depending on the application scenario. For example, in wireless communication scenarios, communication equipment can be cellular network base stations, mobile terminals, etc.; in satellite communication scenarios, communication equipment can be ground station equipment, satellite transponder equipment, etc.; in radar system scenarios, communication equipment can be various radar devices. Communication equipment also includes a signal transceiver unit, used to transmit the target radio frequency signal output from the power amplifier circuit to the corresponding device.

[0069] In practical implementation, the power amplifier circuit amplifies the received or generated initial radio frequency (RF) signal, increasing its power to a sufficiently high level so that the transceiver unit can transmit the amplified target RF signal. The initial RF signal can be the RF signal received by the transceiver unit and sent to the power amplifier circuit. For example, in a satellite communication scenario, the transceiver unit can be an antenna unit deployed on a ground station. The antenna unit receives the initial RF signal transmitted from the satellite; this initial RF signal is the downlink signal. The power amplifier amplifies the downlink signal and outputs the amplified downlink signal as the target RF signal to the antenna unit, enabling the antenna unit to transmit the target RF signal to other ground equipment terminals or user terminals.

[0070] It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0071] This specification provides a communication device that can dynamically adjust the bias voltage of the auxiliary power amplifier unit through a power amplifier circuit, so that the compression power point of the main power amplifier unit and the turn-on power point of the auxiliary power amplifier unit are matched as closely as possible. This ensures that the power amplifier circuit can amplify the radio frequency signal normally and that the communication device can stably provide high-quality communication services.

[0072] See Figure 5 , Figure 5 A schematic diagram of a communication system provided in one embodiment of this specification is shown. The communication system 50 includes the aforementioned communication device 502 and a transceiver device 504 that has a communication relationship with the communication device 502. The communication device 502 is used to send a target radio frequency signal to the transceiver device 504.

[0073] In practical applications, a communication system can include communication equipment and transceiver equipment that communicates with the communication equipment. Communication systems can be satellite communication systems, broadcast communication systems, wireless communication systems, etc. The communication equipment and transceiver equipment differ in different communication systems. For example, in a satellite communication system, the communication equipment can be a ground station, and the transceiver equipment can be a satellite; conversely, the communication equipment can also be a satellite, and the transceiver equipment can be a ground station. The communication equipment and transceiver equipment have a communication relationship; that is, the communication equipment can send radio frequency signals to the transceiver equipment and can also receive radio frequency signals sent by the transceiver equipment.

[0074] In specific implementation, the communication equipment in the communication system includes the power amplifier circuit provided in the above embodiments, thereby solving the problem of unstable linearity of the power amplifier circuit due to load mismatch when power amplification of radio frequency signals is involved in the communication process.

[0075] In a specific embodiment of this specification, the communication system is a broadcast communication system, and the communication equipment can be a radio transmitter. The radio transmitter sends the target radio frequency signal, such as a television signal or a broadcast signal, to the transceiver equipment. The transceiver equipment can be a user's television, radio, etc., so that the transceiver equipment can provide corresponding services to the user after receiving the target radio frequency signal.

[0076] It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0077] This specification provides a communication system in which the bias voltage of the auxiliary power amplifier unit can be dynamically adjusted through the power amplifier circuit of the communication equipment in the system. This ensures that the compression power point of the main power amplifier unit and the turn-on power point of the auxiliary power amplifier unit are matched as closely as possible, thereby ensuring that the power amplifier circuit can amplify the radio frequency signal normally and guaranteeing that the communication equipment can stably provide high-quality communication services.

[0078] The foregoing has described specific embodiments of this application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in a different order than that shown in the embodiments and may still achieve the desired results. Furthermore, the processes depicted in the drawings do not necessarily require the specific or sequential order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0079] It should be noted that, for the sake of simplicity, the foregoing embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0080] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0081] The preferred embodiments disclosed above are merely illustrative of this application. The optional embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this application. These embodiments are selected and specifically described in this application to better explain the principles and practical applications of this application, thereby enabling those skilled in the art to better understand and utilize this application. This application is limited only by the claims and their full scope and equivalents.

Claims

1. A power amplification circuit, characterized by, The circuit includes a power amplifier module, a peak detection module, and a bias adjustment module; The power amplifier module includes a main power amplifier unit and an auxiliary power amplifier unit. The peak detection module is used to detect the first peak voltage output by the main power amplifier unit and the second peak voltage output by the auxiliary power amplifier unit, and output the first peak voltage and the second peak voltage to the bias adjustment module. The bias adjustment module is used to determine the power point information corresponding to the auxiliary power amplifier unit based on the first peak voltage and the second peak voltage, and to adjust the bias voltage of the auxiliary power amplifier unit based on the power point information.

2. The circuit of claim 1, wherein, The circuit includes a power divider; The power divider is used to receive input signals, divide the input signals to obtain a first input signal corresponding to the main power amplifier unit and a second input signal corresponding to the auxiliary power amplifier unit, transmit the first input signal to the main power amplifier unit, and transmit the second input signal to the auxiliary power amplifier unit.

3. The circuit of claim 2, wherein, The circuit includes a bias output module; The bias output module is used to transmit a first bias voltage of the main power amplifier unit to the main power amplifier unit and a second bias voltage of the auxiliary power amplifier unit to the bias adjustment module, wherein the first bias voltage is used to put the main power amplifier unit in a first preset bias state and the second bias voltage is used to put the auxiliary power amplifier unit in a second preset bias state. The main power amplifier unit is used to amplify the first input signal based on the first bias voltage to obtain a first amplified signal.

4. The circuit of claim 3, wherein, The bias adjustment module is used to determine the compression power point of the main power amplifier unit based on the first peak voltage, and to determine the activation power point of the auxiliary power amplifier unit based on the second peak voltage, and to use the compression power point and the activation power point as the power point information of the auxiliary power amplifier unit.

5. The circuit of claim 4, wherein, The bias adjustment module is used to adjust the second bias voltage based on the compression power point and the turn-on power point to obtain the adjusted second bias voltage corresponding to the auxiliary power amplifier unit, wherein the adjusted second bias voltage is used to adjust the turn-on power point corresponding to the auxiliary power amplifier unit. The auxiliary power amplifier unit is used to amplify the second input signal based on the adjusted second bias voltage to obtain a second amplified signal.

6. The circuit of claim 5, wherein, The circuit includes a power combiner; The power combiner is used to receive the first amplified signal and the second amplified signal, and to combine the first amplified signal and the second amplified signal to obtain the output amplified signal corresponding to the input signal.

7. A communication device, characterized by The device includes the power amplifier circuit according to any one of claims 1-6, and a signal transceiver unit connected to the power amplifier circuit; The power amplifier circuit is used to amplify the initial radio frequency signal to obtain the target radio frequency signal corresponding to the initial radio frequency signal, and output the target radio frequency signal to the signal transceiver unit.

8. A communication system, characterized by The system includes the communication device as described in claim 7, and a transceiver device that has a communication relationship with the communication device; The communication device is configured to send a target radio frequency signal to the transceiving device.

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