Signal modulation circuit, signal emission system and signal modulation method

Abstract

According to the signal modulation circuit, the signal transmitting system and the signal modulation method, the signal modulation circuit can independently adjust the phase, the amplitude, the phase inflection point and the amplitude inflection point of the input signal, and the modulated signal is good in linearity when output by a power amplifier. The signal modulation circuit can also control and execute different signal modulation schemes according to the difference between the original input signal and the transmitted signal, namely, adaptive signal modulation is executed. The signal modulation circuit has excellent adaptability in different application scenes. The signal emitted by the signal modulation method and the signal emission system provided by the invention is high in linearity, and can be applied to different application scenes.

Description

Technical Field

[0001] The present application relates to the field of communications, and in particular, to a signal modulation circuit, a signal transmission system and a signal modulation method. Background Art

[0002] A power amplifier (PA) is an electronic device that amplifies signal power. In the field of communications, PA can be widely used to amplify the power of information waiting to be transmitted by mobile communication base stations and communication systems.

[0003] With the widespread use of the fifth generation (5G) mobile communications, higher requirements are placed on multimedia data services, and mobile communication systems are further developing in the direction of high speed, low latency, and large capacity. At the same time, in order to maximize spectrum utilization, improve communication rate and communication capacity, complex multi-carrier transmission and digital modulation technologies such as orthogonal frequency division multiplexing multi-carrier modulation technology and high-order orthogonal amplitude modulation are widely used, which increases the average power in the channel and makes the RF power amplifier closer to saturation. While its efficiency is improved, the nonlinear distortion of the output signal is also aggravated, and the communication quality is reduced.

[0004] How to improve the linearity of PA output signals and improve communication quality is a question worth considering. Summary of the invention

[0005] The present application provides a signal modulation circuit, a signal transmission system and a signal modulation method. The signal modulation circuit can separately modulate the phase, amplitude and phase inflection point of the input signal. The input signal modulation has more dimensions, and the linearity of the signal output by the PA after modulation is better. The signal transmission system uses the output signal for communication with higher quality.

[0006] In a first aspect, a signal modulation circuit is provided, comprising: a phase modulation module, an amplitude modulation module and a driving amplification module, wherein the phase modulation module, the amplitude modulation module and the driving amplification module are cascaded in sequence, or the amplitude modulation module, the phase modulation module and the driving amplification module are cascaded in sequence; the phase modulation module is used to modulate the phase of an input signal alone, the amplitude modulation module is used to modulate the amplitude of an input signal alone, and the driving amplification module is used to increase the power output of the modulated input signal.

[0007] In some scenarios, the phase modulation module may also be called a phase modulation circuit, the amplitude modulation module may also be called an amplitude modulation circuit, and the driving amplifier module may also be called a driving amplifier.

[0008] In this technical solution, the phase modulation module and the amplitude modulation module are used to adjust the phase and amplitude of the input signal separately. That is to say, the input signal is modulated by the signal modulation circuit provided by this technical solution, and the phase modulation and amplitude modulation are decoupled from each other. Compared with the modulation method associated with phase modulation and amplitude modulation, the modulation circuit provided by this technical solution has more modulation dimensions, the adjustable range of the phase and amplitude of the input signal is large, the modulation of the input signal is more refined, and the output signal obtained by modulation has a better linear compensation effect on the PA.

[0009] In combination with the first aspect, in certain implementations of the first aspect, the signal modulation circuit also includes: a first modulation module and a second modulation module, the first modulation module is connected between the phase modulation module and the amplitude modulation module, the second modulation module is connected between the amplitude modulation module and the driving amplification module, the first modulation module is used to modulate the phase inflection point of the input signal, and the second modulation module is used to modulate the phase inflection point and the amplitude inflection point of the input signal; or, the first modulation module is connected between the amplitude modulation module and the phase modulation module, the second modulation module is connected between the phase modulation module and the driving amplification module, the first modulation module is used to modulate the amplitude inflection point of the input signal, and the second modulation module is used to modulate the amplitude inflection point and the phase inflection point of the input signal.

[0010] In some scenarios, the first modulation module and the second modulation module both include a variable gain amplifier, the first modulation module can be called VGA1, and the second modulation module can be called VGA2.

[0011] In this technical solution, the first modulation module and the second modulation module are used to further modulate the phase inflection point and the amplitude inflection point of the input signal, which introduces more modulation dimensions into the modulation process of the input signal, which is beneficial to further improve the linearity of the PA output signal to a certain extent.

[0012] In combination with the first aspect, in some implementations of the first aspect, the signal modulation circuit further includes a control module, and the control module is used to control one or more of the following: a phase modulation module, an amplitude modulation module, a first modulation module, or a second modulation module.

[0013] In a possible implementation, the control module may control one or more of the multiple modulation modules to execute different modulation schemes according to application scenarios.

[0014] A control module is introduced into the signal modulation circuit to control the execution of different modulation schemes, so that the signal modulation circuit can be applied to more application scenarios, which is conducive to improving the application scope of the signal modulation circuit provided in the present application.

[0015] In combination with the first aspect, in certain implementations of the first aspect, the signal modulation circuit also includes a power division module, which is connected to the phase modulation module and the control module, and is used to divide the input signal into a first sub-input signal input to the phase modulation module and a second sub-input signal input to the control module; or, the power division module is connected to the amplitude modulation module and the control module, and is used to divide the input signal into a first sub-input signal input to the amplitude modulation module and a second sub-input signal input to the control module.

[0016] In a possible implementation, the control module may control the execution of different signal modulation schemes according to the second sub-input signal and the PA coupling signal.

[0017] In combination with the first aspect, in some implementations of the first aspect, the control module is further used to control the input power of the input signal.

[0018] Using the control module to control the input power of the input signal is equivalent to providing another factor to control the signal modulation process, which is helpful to simplify the subsequent modulation process of signal amplitude and signal phase to a certain extent, and is helpful to improve the linearity of the PA output signal.

[0019] In combination with the first aspect, in certain implementations of the first aspect, the phase modulation module includes a first transistor, a first inductor and a second inductor, the first inductor and the second inductor are coupled, two ends of the first inductor are respectively connected to the emitter and the collector of the first transistor, and two ends of the second inductor are respectively connected to the input port and the output port of the phase modulation module; the base of the first transistor is connected to the control port of the phase modulation module.

[0020] In a possible implementation, the control module may generate a nonlinear characteristic by switching the first transistor on and off, and the nonlinear characteristic is used to adjust the phase of the input signal.

[0021] The phase modulation module provided in the present technical solution has a simple structure, a short signal control process, and a high control efficiency, which is beneficial to improving the efficiency of signal modulation using the signal modulation circuit provided in the present application.

[0022] In combination with the first aspect, in certain implementations of the first aspect, the amplitude modulation module includes a second transistor, a third transistor and a third inductor, the base of the second transistor is connected to the input port of the amplitude modulation module, and the emitter of the second transistor is grounded; the base of the third transistor is connected to the output port of the amplitude modulation module, and the emitter of the third transistor is grounded; and the two ends of the third inductor are respectively connected to the collector of the second transistor and the collector of the third transistor.

[0023] In a possible implementation, the control module may control the gain of the second transistor and the third transistor, thereby controlling the amplitude of the nonlinear component caused by the amplitude modulation module.

[0024] The amplitude modulation module provided in the present technical solution has a simple structure, a short signal control process, and a high control efficiency, which is beneficial to improving the efficiency of signal modulation using the signal modulation circuit provided in the present application.

[0025] In a second aspect, a signal transmission system is provided, including: a phase modulation module, an amplitude modulation module, a driving amplification module and a power amplifier, wherein the phase modulation module, the amplitude modulation module and the driving amplification module are cascaded in sequence, or the amplitude modulation module, the phase modulation module and the driving amplification module are cascaded in sequence; the phase modulation module is used to modulate the phase of the input signal alone, the amplitude modulation module is used to modulate the amplitude of the input signal alone, and the driving amplification module is used to increase the power of the modulated input signal and output it to the power amplifier; the power amplifier is used to transmit the signal.

[0026] In this technical solution, the phase modulation module and the amplitude modulation module are used to separately adjust the phase and amplitude of the input signal. That is to say, the input signal is modulated by the signal modulation circuit provided by this technical solution, and the phase modulation and amplitude modulation are decoupled from each other. Compared with the modulation method associated with phase modulation and amplitude modulation, the modulation circuit provided by this technical solution has more modulation dimensions, the modulation of the input signal is more refined, and the output signal obtained by modulation has a better linear compensation effect on the PA.

[0027] In combination with the second aspect, in certain implementations of the second aspect, the signal transmission system also includes: a first modulation module and a second modulation module, the first modulation module is connected between the phase modulation module and the amplitude modulation module, the second modulation module is connected between the amplitude modulation module and the driving amplification module, the first modulation module is used to modulate the phase inflection point of the input signal, and the second modulation module is used to modulate the phase inflection point and amplitude inflection point of the input signal; or, the first modulation module is connected between the amplitude modulation module and the phase modulation module, the second modulation module is connected between the phase modulation module and the driving amplification module, the first modulation module is used to modulate the amplitude inflection point of the input signal, and the second modulation module is used to modulate the amplitude inflection point and phase inflection point of the input signal.

[0028] In this technical solution, the first modulation module and the second modulation module are used to further modulate the phase inflection point and the amplitude inflection point of the input signal, which introduces more modulation dimensions into the modulation process of the input signal, which is beneficial to further improve the linearity of the PA output signal to a certain extent.

[0029] In combination with the second aspect, in certain implementations of the second aspect, the signal transmission system also includes a power division module and a control module, the power division module is connected to the phase modulation module and the control module, and is used to divide the input signal into a first sub-input signal input to the phase modulation module and a second sub-input signal input to the control module, or the power division module is connected to the amplitude modulation module and the control module, and is used to divide the input signal into a first sub-input signal input to the amplitude modulation module and a second sub-input signal input to the control module; the control module is used to: control one or more of the following according to the feedback signal and the second sub-input signal: a phase modulation module, an amplitude modulation module, a first modulation module or a second modulation module; wherein the feedback signal is obtained by coupling the transmission signal of the power amplifier.

[0030] In this technical solution, the control module can determine the control signal by the difference between the original input signal and the power amplifier transmission signal. Different original output signals and different transmission signals can generate different control signals. The implementation of this technical solution is conducive to realizing that the control module adaptively determines the signal modulation scheme according to the application scenario, and is conducive to enabling the signal transmission system to generate a transmission signal with high linearity in different application scenarios.

[0031] In combination with the second aspect, in certain implementations of the second aspect, the control module is specifically used to: generate one or more control signals based on the feedback signal and the second sub-input signal; and send the control signal to one or more of the following: a phase modulation module, an amplitude modulation module, a first modulation module, or a second modulation module.

[0032] In combination with the second aspect, in certain implementations of the second aspect, the control module includes an alignment submodule and a signal generation submodule, the alignment submodule is used to align the phase and / or amplitude of the second sub-input signal with the feedback signal, and output the aligned signal to the signal generation submodule, and the signal generation submodule is used to generate a control signal based on the aligned signal.

[0033] In a possible implementation, the alignment submodule is used to output two aligned and normalized signals;

[0034] In one possible implementation, the signal generation submodule includes a high-speed differential operation circuit, a peak detector circuit, a segmentation circuit, and a controllable integration circuit, wherein the high-speed differential operation circuit is used to amplify the error between the two signals output by the alignment submodule and output the amplified error signal; the peak detection circuit is used to determine the envelope of the amplified error signal according to the amplified error signal. The segmentation circuit is used to represent the envelope of the error signal in segments to improve the error representation accuracy. The controllable integration circuit can be used to integrate the segmented signal to obtain an output control voltage signal.

[0035] The detailed explanation and beneficial effects of the following technical solutions can be referred to the relevant descriptions in the first to third aspects, and for the sake of brevity, they are not repeated here.

[0036] According to a third aspect, a signal modulation method is provided, comprising: receiving a feedforward signal and a feedback signal, the feedback signal being obtained by coupling a transmission signal of a power amplifier, and the feedforward signal being a part of an input signal; generating a control signal according to the feedforward signal and the feedback signal, the control signal comprising a first sub-control signal and / or a second sub-control signal, the first sub-control signal being used to control the phase of the input signal to be modulated separately, and the second sub-control signal being used to control the amplitude of the input signal to be modulated separately; and modulating the input signal according to the control signal.

[0037] In combination with the third aspect, in certain implementations of the third aspect, the control signal also includes a third sub-control signal and / or a fourth sub-control signal, the third sub-control signal is used to control the modulation of the phase inflection point or the amplitude inflection point of the input signal, and the fourth sub-control signal is used to control the modulation of the phase inflection point and the amplitude inflection point of the input signal.

[0038] In combination with the third aspect, in certain implementations of the third aspect, the control signal further includes a fifth sub-control signal, and the fifth sub-control signal is used to control the power of the input signal.

[0039] In a fourth aspect, a signal modulation device is provided, which includes a communication module and a processing module, wherein the communication module is used to receive a feedforward signal and a feedback signal, the feedback signal is obtained by coupling the transmission signal of the power amplifier, and the feedforward signal is a part of the input signal; the processing module is used to: generate a control signal according to the feedforward signal and the feedback signal, the control signal includes a first sub-control signal and / or a second sub-control signal, the first sub-control signal is used to control the phase of the input signal to be modulated separately, and the second sub-control signal is used to control the amplitude of the input signal to be modulated separately; modulate the input signal according to the control signal.

[0040] In combination with the fourth aspect, in certain implementations of the fourth aspect, the control signal also includes a third sub-control signal and / or a fourth sub-control signal, the third sub-control signal is used to control the modulation of the phase inflection point or the amplitude inflection point of the input signal, and the fourth sub-control signal is used to control the modulation of the phase inflection point and the amplitude inflection point of the input signal.

[0041] In combination with the fourth aspect, in certain implementations of the fourth aspect, the control signal further includes a fifth sub-control signal, and the fifth sub-control signal is used to control the power of the input signal.

[0042] In a fifth aspect, an electronic device is provided, which includes a processor and a memory, the memory is used to store program instructions, and the processor is used to: receive a feedforward signal and a feedback signal, the feedback signal is obtained by coupling the transmission signal of the power amplifier, and the feedforward signal is a part of the input signal; generate a control signal according to the feedforward signal and the feedback signal, the control signal includes a first sub-control signal and / or a second sub-control signal, the first sub-control signal is used to control the phase of the input signal to be modulated separately, and the second sub-control signal is used to control the amplitude of the input signal to be modulated separately; modulate the input signal according to the control signal.

[0043] In combination with the fifth aspect, in certain implementations of the fifth aspect, the control signal also includes a third sub-control signal and / or a fourth sub-control signal, the third sub-control signal is used to control the modulation of the phase inflection point or the amplitude inflection point of the input signal, and the fourth sub-control signal is used to control the modulation of the phase inflection point and the amplitude inflection point of the input signal.

[0044] In combination with the fifth aspect, in certain implementations of the fifth aspect, the control signal also includes a fifth sub-control signal, and the fifth sub-control signal is used to control the power of the input signal.

[0045] In a sixth aspect, a chip is provided, comprising a processor for reading instructions stored in a memory, wherein when the processor executes the instructions, the chip implements the method in the third aspect and any possible implementation thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a schematic diagram of a signal transmission system provided in an embodiment of the present application.

[0047] Figure 2 It is a schematic diagram of a phase modulation circuit provided in an embodiment of the present application.

[0048] Figure 3 yes Figure 2 Schematic diagram of the relationship between gain and phase change of the phase modulation circuit.

[0049] Figure 4 yes Figure 2 Schematic diagram of the relationship between gain and amplitude change of the phase modulation circuit.

[0050] Figure 5 It is a schematic diagram of an amplitude modulation circuit provided in an embodiment of the present application.

[0051] Figure 6 yes Figure 5 Schematic diagram of the relationship between gain and amplitude variation in the amplitude modulation circuit.

[0052] Figure 7 yes Figure 5Schematic diagram of the relationship between gain and phase change in the medium amplitude modulation circuit.

[0053] Figure 8 It is a schematic diagram of another signal transmission system provided in an embodiment of the present application.

[0054] Fig. 9 It is a schematic diagram of the relationship between the phase inflection point and the gain of a variable gain amplifier provided in an embodiment of the present application.

[0055] Fig.10 It is a schematic diagram of a circuit of a variable gain amplifier provided in an embodiment of the present application.

[0056] Fig.11 It is a schematic diagram of the relationship between the phase inflection point and the amplitude inflection point and the gain of the variable gain amplifier provided in an embodiment of the present application.

[0057] Fig.12 It is a schematic diagram of another circuit of a variable gain amplifier provided in an embodiment of the present application.

[0058] Fig.13 It is a schematic diagram of another signal transmission system provided in an embodiment of the present application.

[0059] Fig.14 It is a schematic diagram of a control circuit provided in an embodiment of the present application.

[0060] Fig.15 It is a schematic diagram of another signal transmission system provided in an embodiment of the present application.

[0061] Fig.16 It is a schematic diagram of a signal transmission method provided in an embodiment of the present application.

[0062] Fig.17 It is a schematic diagram of a signal modulation device provided in an embodiment of the present application.

[0063] Fig.18 It is a schematic diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0064] Embodiments of the present application are described in detail below, and examples of the embodiments of the present application are shown in the accompanying drawings. In the accompanying drawings, the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0065] Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by persons having ordinary skills in the technical field to which this application belongs. In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to this application.

[0066] References to "one embodiment" or "some embodiments" etc. described in this specification mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear at different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0067] Before formally introducing the embodiments of the present application, the terms that may be used in the following content are first explained.

[0068] Cascading is the process or system of connecting multiple circuits together to form an integrated process. This process involves connecting the output of one circuit to the input of another circuit to form a continuous operation relationship. Cascading can be achieved not only through series connection, but also through parallel connection to build a more complex circuit system.

[0069] Radio frequency (RF), also known as radio frequency, wireless radio frequency or high frequency, is an oscillation frequency in the range of 3kHz to 300GHz, which is equivalent to the frequency of radio waves and the frequency of alternating current carrying radio signals.

[0070] The power amplifier (PA) is an important component in the radio frequency transmission circuit. Its main function is to amplify the signal and then send it out.

[0071] A power divider, also known as a power divider, is a device that divides one input signal energy into two or more outputs of equal or unequal energy.

[0072] A digital-to-analog converter (ADC) is a device that converts a digital signal into an analog signal (in the form of current, voltage, or charge).

[0073] An analog-to-digital converter (DAC) is a device used to convert a continuous signal in analog form into a discrete signal in digital form.

[0074] A variable gain amplifier (VGA), also known as a voltage control amplifier (VCA), is an electronic amplifier that changes its gain according to a control voltage.

[0075] Analog pre-distortion (APD) is a technology that pre-distorts the input signal in the analog domain. The distorted signal component generated by the RF signal after passing through the RF power amplifier is equal in amplitude and opposite in phase to the distorted signal component generated by the original input RF signal, so as to offset the nonlinear effect of the power amplifier on the input signal, thereby achieving the purpose of linear optimization.

[0076] In order to reduce the gap between the output signal and the input signal and improve the linearity of the output signal, such as Figure 1 As shown, the present application provides a first signal transmitting system 1000, which can adjust the amplitude and phase of an input signal separately and separately, and the amplitude and phase of the input signal have a large adjustable range and high adjustment accuracy.

[0077] The first signal transmission system 1000 may include a phase modulation circuit 100, an amplitude modulation circuit 200, a driver amplifier 300, and a power amplifier 400. The phase modulation circuit 100, the amplitude modulation circuit 200, and the driver amplifier 300 are cascaded in sequence, or the amplitude modulation circuit 200, the phase modulation circuit 100, and the driver amplifier 300 are cascaded in sequence, and the output port of the driver amplifier 300 is connected to the power amplifier 400.

[0078] In the following examples, the phase modulation circuit 100, the amplitude modulation circuit 200 and the driving amplifier 300 are mainly cascaded in sequence for explanation, and the case where the amplitude modulation circuit 200, the phase modulation circuit 100 and the driving amplifier 300 are cascaded in sequence can be used as a reference for execution.

[0079] In some scenarios, the phase modulation circuit 100 , the amplitude modulation circuit 200 , and the driving amplifier 300 may constitute a first signal modulation circuit 1100 , which may be used to modulate the phase and amplitude of a signal input to the power amplifier 400 .

[0080] In some scenarios, the phase modulation circuit 100 may also be referred to as a phase modulation module 100 , and the amplitude modulation circuit 200 may also be referred to as an amplitude modulation module 200 .

[0081] In some examples, the input signal is input from the input port of the phase modulation circuit 100 to the first signal transmission system 1000 , enters the power amplifier 400 after being processed by the phase modulation circuit 100 , the amplitude modulation circuit 200 , and the driver amplifier 300 , and is output from the output port of the power amplifier 400 .

[0082] The phase modulation circuit 100 can independently adjust the phase of the input signal, or in other words, the phase modulation circuit 100 can independently perform phase distortion compensation on the input signal. In some examples, the phase modulation circuit 100 can achieve independent phase adjustment function by adjusting the magnitude of the external control voltage.

[0083] For example, Figure 2 FIG. 1 is a schematic diagram of a phase modulation circuit 100 provided in an embodiment of the present application. The phase modulation circuit 100 may include a first input port, a first output port, and a first control port. An input signal is input to the phase modulation circuit 100 through the first input port, and an output signal is output from the phase modulation circuit 100 through the first output port. An external control voltage V PM The first control port is used to input the phase modulation circuit 100 .

[0084] In some examples, the phase modulation circuit 100 may include at least one transistor, a plurality of resistors, a plurality of inductors, and a plurality of capacitors.

[0085] Exemplarily, the phase modulation circuit 100 may include a first transistor M1, the base of the first transistor M1 is connected to the first control port, the collector and the emitter of the first transistor M1 are both grounded, and a first inductor L1 may be connected between the collector and the emitter of the first transistor M1. As an example but not a limitation, a first resistor R1 may be connected between the first control port and the base of the first transistor M1, a second resistor R2 may be connected between the emitter of the first transistor M1 and the ground point, and a third resistor R3 may be connected between the collector of the first transistor M1 and the ground point.

[0086] Exemplarily, a second inductor L2 may be connected between the first input port and the first output port, and the second inductor L2 may be coupled with the aforementioned first inductor L1 to form a pair of coupled inductors. As an example but not a limitation, a first capacitor C1 may be connected between the first input port and the first end of the second inductor L2, and a second capacitor C2 may be connected between the first output port and the second end of the second inductor L2.

[0087] Exemplarily, a third capacitor C3 may be connected between the base of the first transistor M1 and the first output terminal.

[0088] During the operation of the phase modulation circuit 100, the control voltage V input by the first control terminal PM The opening degree of the first transistor M1 can be controlled so that the equivalent capacitance of the first transistor M1 presents a nonlinear characteristic, and the nonlinear characteristic can be coupled to the second inductor L2 through the first inductor L1 connected to the first transistor M1, so that the second inductor L2 between the first input terminal and the first output terminal generates a nonlinear delay for the current passing through the second inductor L2. Therefore, a nonlinear phase shift can be generated between the output signal and the input signal of the phase adjustment 100, so as to achieve the purpose of adjusting the phase of the input signal.

[0089] There is no voltage adjustment involved between the first output terminal and the first input terminal, and therefore, the amplitudes of the output signal and the input signal of the phase modulation circuit 100 can be considered unchanged, that is, the phase modulation circuit 100 can adjust the phase of the input signal alone without affecting the amplitude of the input signal.

[0090] By monitoring the amplitude and phase of different output signals under different control voltages, we can get Figure 3 and Figure 4 Schematic diagram of the change of amplitude and phase, Figure 3 and Figure 4 The curves of different line types represent different control voltages V PM .like Figure 3 , for different control voltages, the amplitude of the output signal of the first output port does not change substantially. Figure 4 In the example, as the control voltage changes, the phase of the output signal of the first output port changes accordingly. In other words, by changing the control voltage V PM , the phases of the output signal of the phase modulation circuit 100 and the input signal can be changed accordingly, while the amplitude of the input signal will not be affected thereby.

[0091] The signal outputted by the first output port of the phase modulation circuit 100 can be inputted into the amplitude modulation circuit 200. The amplitude modulation circuit 200 can adjust the amplitude of the input signal independently, or in other words, the amplitude modulation circuit 200 can perform amplitude distortion compensation on the input signal independently. In some examples, the amplitude modulation circuit 200 can realize the independent amplitude adjustment function by changing the magnitude of the external control voltage.

[0092] For example, Figure 5 FIG. 2 is a schematic diagram of an amplitude modulation circuit 200 provided in an embodiment of the present application. The amplitude modulation circuit 200 may include a second input port, a second output port, and a second control port. An input signal is input to the amplitude modulation circuit 200 through the second input port, and an output signal is output from the amplitude modulation circuit 200 through the second output port. The external control voltage V AM The second control port is input to the amplitude modulation circuit 200 .

[0093] In some examples, the amplitude modulation circuit 200 may include at least two transistors, one or more resistors, one or more inductors, and a plurality of capacitors.

[0094] Exemplarily, the amplitude modulation circuit 200 may include a second transistor M2 and a third transistor M3, wherein the base of the second transistor M2 is connected to the second input port, the emitter is grounded, and the collector is connected to the second control port. The base of the third transistor M3 is connected to the second output port, the emitter is grounded, and the collector is connected to the second input terminal.

[0095] In some examples, a third inductor L3 is connected between the second input terminal and the second output terminal. Exemplarily, a fourth capacitor C4 may be connected between the third inductor L3 and the second input terminal, and a fifth capacitor C5 may be connected between the third inductor L3 and the second output terminal. A fourth resistor R4 may be connected between the second control port and the collector of the second transistor M2.

[0096] As an example but not limitation, the fourth resistor R4 and the collector of the second transistor M2 are connected to point A, and the fourth capacitor C4 and the third inductor L3 may also be connected to point A.

[0097] During the operation of the amplitude modulation circuit 200, the second transistor M2 and the third transistor M3, both of which are connected to the circuit in the form of diodes, can be used to generate a nonlinear component of the amplitude. The external control voltage V AMThe size of can affect the size of the nonlinear component generated by the second transistor M2 and the third transistor M3, thereby controlling the amplitude of the nonlinear component. By setting the value of the third inductor (series inductor) L3, the nonlinear phase distortion caused by the amplitude adjustment process can be reduced. On this basis, the phase of the input signal input to the amplitude modulation circuit 200 will not change significantly when it is output from the output end, and the amplitude can be effectively adjusted.

[0098] By monitoring the amplitude and phase of different output signals under different control voltages, we can get Figure 6 and Figure 7 Schematic diagram of the phase and amplitude changes, Figure 6 and Figure 7 In the figure, curves of different line types represent different control voltages V AM .like Figure 6 , for different control voltages, the phase of the output signal of the second output port does not change substantially. Figure 7 In other words, as the control voltage V AM With the change of , the amplitude of the output signal of the amplitude modulation circuit and the amplitude of the input signal change accordingly, while the phase of the input signal will not be affected.

[0099] Before the signal after phase and amplitude adjustment is input to the power amplifier 400 , the driving amplifier 300 may be used to amplify the signal, that is, to increase the power of the signal so that the power can meet the requirement of the power amplifier 400 .

[0100] Figure 1 In the first signal transmission system 1000 shown, the amplitude and phase of the input signal can be adjusted separately, and the first signal modulation circuit 1100 can perform more accurate linear compensation on the power amplifier. The linearity of the power amplifier output signal adjusted by the first signal modulation circuit 1100 is better.

[0101] In order to further improve the accuracy of linear compensation of the power amplifier, the present application provides a second signal transmission system 2000, such as Figure 8 As shown, the second signal transmission system 2000 may include one or more inflection point modulation modules, and the one or more inflection point modulation modules may adjust the phase relative to the inflection point and / or the amplitude relative to the inflection point of the input signal.

[0102] In some examples, the second signal transmission system 2000 may include a first inflection point modulation module 500A and a second inflection point modulation module 500B. The second signal transmission system 2000 may also include the phase modulation circuit 100, amplitude modulation circuit 200, driving amplifier 300 and power amplifier 400 in the aforementioned first signal transmission system 1000.

[0103] In some scenarios, the phase modulation circuit 100, the first inflection point modulation module 500A, the amplitude modulation circuit 200, the second inflection point modulation module 500B and the driving amplifier 300 in the second signal transmission system 2000 may constitute a second signal modulation circuit 2100. The second signal modulation circuit 2100 may modulate the phase, amplitude, phase inflection point and amplitude inflection point of the signal input to the power amplifier 400.

[0104] In some examples, the first inflection point modulation module 500A and the second inflection point modulation module 500B may each include a variable gain amplifier.

[0105] In some scenarios, the first inflection point modulation module 500A may also be referred to as VGA1 or a first VGA module, and the second inflection point modulation module 500B may also be referred to as VGA2 or a second VGA module.

[0106] In some examples, the first inflection point modulation module 500A can be connected between the phase modulation circuit 100 and the amplitude modulation circuit 200. In other words, the phase-compensated signal is output by the phase modulation circuit 100 and then enters the first inflection point modulation module 500A. The first inflection point modulation module 500A can control the phase (i.e., normalized phase) output inflection point of the phase-compensated signal.

[0107] In some examples, the first inflection point modulation module 500A can be connected between the amplitude modulation circuit 200 and the phase modulation circuit 100. In other words, the amplitude-compensated signal is output by the amplitude modulation circuit 200 and enters the first inflection point modulation module 500A. The first inflection point modulation module 500A can control the amplitude output inflection point of the amplitude-compensated signal.

[0108] The following description is mainly based on the case where the first inflection point modulation module 500A receives the output signal of the phase modulation circuit 100 and the second inflection point modulation module 500B receives the output signal of the amplitude modulation circuit 200. The case where the first inflection point modulation module 500A receives the output signal of the amplitude modulation circuit 200 and the second inflection point modulation module 500B receives the output signal of the phase modulation circuit 100 can be used as a reference.

[0109] It should be noted that, for the case where the first inflection point modulation module 500A receives the output signal of the phase modulation circuit 100 and the second inflection point modulation module 500B receives the output signal of the amplitude modulation circuit 200 (i.e., the phase modulation circuit 100, the first inflection point modulation module 500A, the amplitude modulation circuit 200 and the second inflection point modulation module 500B are cascaded in sequence), the second inflection point modulation module 500B alone modulates the amplitude inflection point of the input signal of the second signal transmission system 2000, and the first inflection point modulation module 500A and the second inflection point modulation module 500B jointly modulate the phase inflection point of the input signal of the second signal transmission system 2000. For the case where the first inflection point modulation module 500A receives the output signal of the amplitude modulation circuit 200 and the second inflection point modulation module 500B receives the output signal of the phase modulation circuit 100 (i.e., the amplitude modulation circuit 200, the first inflection point modulation module 500A, the phase modulation circuit 100 and the second inflection point modulation module 500B are cascaded in sequence), the second inflection point modulation module 500B alone modulates the phase inflection point of the input signal of the second signal transmission system 2000, and the first inflection point modulation module 500A and the second inflection point modulation module 500B jointly modulate the amplitude inflection point of the input signal of the second signal transmission system 2000.

[0110] For example, Fig. 9 Shown is a schematic diagram of the change of the inflection point of the phase and the inflection point of the amplitude with the output power provided in an embodiment of the present application.

[0111] Fig. 9 In the figure, the dotted line is a curve of the change of the normalized output phase with the output power, and the solid line is a curve of the change of the normalized gain with the output power. The output inflection point of the normalized phase can be changed by adjusting the gain of the first inflection point modulation module 500A, without affecting the amplitude output inflection point of the signal. For example, by increasing the gain of the first inflection point modulation module 500A, the output inflection point of the normalized phase can be moved to the right side of the horizontal coordinate axis, and by reducing the gain of the first inflection point modulation module 500A, the output inflection point of the normalized phase can be moved to the left side of the horizontal coordinate axis.

[0112] Fig.10 exemplarily shows a circuit diagram of a first inflection point modulation module 500A, which may include a third input port, a third output port and a third control port. The signal after phase compensation by the phase modulation circuit 100 is input into the first inflection point modulation module 500A via the third input port, and the signal after the phase inflection point adjustment is completed is output from the first inflection point modulation module 500A via the third output port. The external control voltage V C It can be input into the first inflection point modulation module 500A through the third control port.

[0113] In some examples, the first inflection point modulation module 500A may include at least three transistors, multiple capacitors, and one or more inductors.

[0114] Exemplarily, the first inflection point modulation module 500A may include a fourth transistor M4, a fifth transistor M5, and a sixth transistor M6, wherein the emitter of the fourth transistor M4 is grounded, the base is connected to the third input port, and the collector is connected to the emitter of the fifth transistor M5 and the emitter of the sixth transistor M6. The collector of the fifth transistor M5 is connected to the third output port, and the base of the fifth transistor M5 may be an open circuit. The base of the sixth transistor M6 is connected to the third control port, and the potential of the collector of the sixth transistor M6 is a constant potential Vd.

[0115] In some examples, a sixth capacitor C6 is further connected between the third input port and the base of the fourth transistor M4 , and a seventh capacitor C7 is further connected between the fifth transistor M5 and the third output port.

[0116] In some examples, the first inflection point modulation module 500A may also include a fourth inductor L4 and an eighth capacitor C8, the fourth inductor L4 and the eighth capacitor C8 are connected in parallel, one end of the fourth inductor L4 and one end of the eighth capacitor C8 are both connected to the collector of the fifth transistor, and the other end of the fourth inductor L4 and the other end of the eighth capacitor C8 are both at a constant potential Vd.

[0117] During the operation of the first inflection point modulation module 500A, the fifth transistor M5 and the sixth transistor M6 can be cascaded for amplification, the fourth inductor L4 and the eighth capacitor C8 can be used for resonant amplification frequency, and the sixth transistor M6 can be controlled by the external voltage V C To adjust the gain.

[0118] In some examples, in order to increase the gain variable range and expand the bandwidth, multiple first inflection point modulation modules 500A may be connected in series, and each LC resonance point may be controlled at a different frequency to achieve a broadband effect.

[0119] The signal after the phase output inflection point adjustment is completed can be input to the aforementioned amplitude modulation circuit 200. The amplitude modulation circuit 200 can be connected to the second inflection point modulation module 500B, or in other words, the second inflection point modulation module 500B is connected between the amplitude modulation circuit 200 and the driving amplifier 300. The signal after the amplitude compensation by the amplitude modulation circuit 200 can be input to the second inflection point modulation module 500B, and the position of the output inflection point of the amplitude and the output inflection point of the phase of the signal after the amplitude distortion compensation is adjusted.

[0120] For example, Fig.11 Shown is a schematic diagram of the change of the inflection point of the phase and the inflection point of the amplitude with the output power provided in an embodiment of the present application. Fig.11 In the figure, the dotted line is the curve of the normalized output phase changing with the output power, and the solid line is the curve of the normalized gain changing with the output power. The output inflection point of the amplitude of the signal and the position of the output inflection point of the phase can be changed by adjusting the gain of the second inflection point modulation module 500B. For example, by increasing the gain of the second inflection point modulation module 500B, the positions of the output inflection point of the amplitude of the signal and the output inflection point of the phase will both move to the right side of the horizontal coordinate axis; by reducing the gain of the second inflection point modulation module 500B, the positions of the output inflection point of the amplitude of the signal and the output inflection point of the phase will both move to the left side of the horizontal coordinate axis.

[0121] Fig.12 exemplarily shows a circuit diagram of a second inflection point modulation module 500B, and the second inflection point modulation module 500B may include a fourth input port, a fourth output port, and a fourth control port. The signal after the amplitude nonlinear compensation is input into the second inflection point modulation module 500B through the fourth input port, and the signal after the adjustment of the output inflection point of the amplitude and the phase inflection point is output from the second inflection point modulation module 500B through the fourth output port. The external control voltage V C The fourth control port may be input into the second inflection point modulation module 500B.

[0122] In some examples, the second inflection point modulation module 500B may include at least three transistors, multiple capacitors, and one or more inductors.

[0123] Exemplarily, the second inflection point modulation module 500B may include a seventh transistor M7, an eighth transistor M8, and a ninth transistor M9, wherein the emitter of the seventh transistor M7 is grounded, the base is connected to the fourth input port, and the collector is connected to the emitter of the eighth transistor M8 and the emitter of the ninth transistor M9. The collector of the eighth transistor M8 is connected to the fourth output port, and the base of the eighth transistor M8 may be an open circuit. The base of the ninth transistor M9 is connected to the fourth control port, and the collector of the ninth transistor M9 is a constant potential Vd.

[0124] In some examples, a ninth capacitor C9 is further connected between the fourth input port and the base of the seventh transistor M7 , and a tenth capacitor C10 is further connected between the eighth transistor M8 and the fourth output port.

[0125] In some examples, the second inflection point modulation module 500B may also include a fifth inductor L5 and an eleventh capacitor C11, the fifth inductor L5 and the eleventh capacitor C11 are connected in parallel, one end of the fifth inductor L5 and one end of the eleventh capacitor C11 are both connected to the collector of the eighth transistor M8, and the other end of the fifth inductor L5 and the other end of the eleventh capacitor C11 are both at a constant potential Vd.

[0126] During the operation of the second inflection point modulation module 500B, the eighth transistor M8 and the ninth transistor M9 can be cascaded for amplification, the fifth inductor L5 and the eleventh capacitor C11 can be used for resonant amplification frequency, and the ninth transistor M9 can adjust the gain amplitude through the external control voltage Vc.

[0127] In some examples, in order to increase the gain variable range and extend the bandwidth, multiple second inflection point modulation modules 500B may be connected in series, and each LC resonance point may be controlled at a different frequency to achieve a broadband effect.

[0128] By performing phase compensation, amplitude compensation, phase inflection point adjustment and amplitude inflection point adjustment on the input signal, the linear compensation of the power amplifier in the second signal transmission system 2000 is more accurate and the linearity of the output signal is better.

[0129] In order to improve the adaptability of the aforementioned first signal transmission system 1000 or the second signal transmission system 2000 to different application scenarios, the linear compensation strategy for the input signal can be adjusted according to the difference between the input signal and the output signal in different scenarios, that is, the signal adjustment scheme of the phase modulation circuit 100, the amplitude modulation circuit 200 and the variable gain amplifier is changed. Based on this, an embodiment of the present application provides a third signal transmission system 3000, which may include a first control circuit 600, and the first control circuit 600 can be used to control the adjustment schemes of the aforementioned different adjustment circuits.

[0130] by Fig.13 For example, the third signal transmission system 3000 may include the phase modulation circuit 100, the amplitude modulation circuit 200, the driving amplifier 300, the first inflection point modulation module 500A, the second inflection point modulation module 500B and the power amplifier 400 in the second signal transmission system 2000.

[0131] Here, the phase modulation circuit 100, the first inflection point modulation module 500A, the amplitude modulation circuit 200 and the second inflection point modulation module 500B can be cascaded in sequence, or the amplitude modulation circuit 200, the first inflection point modulation module 500A, the phase modulation circuit 100 and the second inflection point modulation module 500B can be cascaded in sequence. The following example mainly describes the former case, and the latter case can be executed for reference.

[0132] In some examples, the third signal transmission system 3000 may include a power divider 700, and an input signal input to the third signal transmission system 3000 is first input to the power divider 700, a first portion of the input signal is input to the first control circuit 600, and a second portion of the input signal is input to the phase modulation circuit 100. Here, the first portion of the input signal may be used as an original signal, and in combination with the output signal of the power amplifier 400, the first control circuit 600 may determine the difference between the original signal and the output signal of the power amplifier 400, thereby generating an error signal.

[0133] In some examples, the third signal transmission system 3000 may include a power divider 700, and an input signal input to the third signal transmission system 3000 is first input to the power divider 700, a first portion of the input signal is input to the first control circuit 600, and a second portion of the input signal is input to the amplitude modulation circuit 200. Here, the first portion of the input signal may be used as an original signal, and in combination with the output signal of the power amplifier 400, the first control circuit 600 may determine the difference between the original signal and the output signal of the power amplifier 400, thereby generating an error signal.

[0134] The first control circuit 600 can be connected to the first control port of the phase modulation circuit 100, the second control port of the amplitude modulation circuit 200, the third control port of the first inflection point modulation module 500A and the fourth control port of the second inflection point modulation module 500B respectively, and send control signals to corresponding circuit components through these control ports.

[0135] In some examples, the first control circuit 600 may also be used to control the power of the input signal input to the third signal transmitting system 3000 .

[0136] In some examples, the first control circuit 600 can generate a control signal based on the output of the analog predistortion and the power amplifier, output a control voltage through a control algorithm, and adaptively adjust the analog predistortion amplitude and the expansion / compression and inflection point of the phase curve to achieve the purpose of adaptive adjustment.

[0137] In some scenarios, the power divider 700, the phase modulation circuit 100, the first inflection point modulation module 500A, the amplitude modulation circuit 200, the second inflection point modulation module 500B, the driver amplifier 300 and the first control circuit 600 in the third signal transmission system 3000 can constitute a third signal modulation circuit 3100. The third signal modulation circuit 3100 can adaptively modulate the phase, amplitude, phase inflection point and amplitude inflection point of the signal input to the power amplifier 400 according to the application scenario.

[0138] In some scenarios, the first control circuit 600 may also be referred to as a first control module 600 .

[0139] Fig.14 Shown is a schematic diagram of a first control circuit 600 provided in an embodiment of the present application. In some examples, the first control circuit 600 may include an alignment circuit 610, a high-speed differential operation circuit 620, a peak detection circuit 630, a segmentation circuit 640, and a controllable integration circuit 650.

[0140] Among them, the alignment circuit 610 is used to align the phase size and power size of the input original signal and the output RF signal, and output two aligned and normalized signals; the high-speed differential operation circuit 620 is used to amplify the error between the two signals output by the alignment circuit 610, and output the amplified error signal; the peak detection circuit 630 is used to determine the envelope of the amplified error signal according to the amplified error signal. The segmentation circuit 640 is used to segmentally represent the envelope of the error signal to improve the error representation accuracy. The controllable integration circuit 650 can be used to integrate the segmented signal to obtain the output control voltage signal.

[0141] In some examples, the first control circuit 600 can output 5 control voltage signals, V P 、V PM 、V C1 、V AM and V C2 Among them, V P Used to control input power; V PM Used to control the phase modulation circuit 100 to adjust the expansion or compression of the input signal phase curve; V AM Used to control the amplitude modulation circuit 200 to adjust the input signal amplitude curve expansion or compression; V C1 Used to control the first inflection point modulation module 500A to achieve phase inflection point control of the input signal; V C2 Used to control the second inflection point modulation module 500B to achieve control of the phase inflection point and amplitude inflection point of the input signal.

[0142] The first control circuit 600 can generate an error signal according to the original signal and the output signal of the power amplifier 400, and generate an output control voltage by optimizing the control algorithm. The optimization algorithm can be written according to the actual situation of the power amplifier to realize real-time monitoring and analysis of the output power and phase and amplitude distortion characteristics of the power amplifier, and update the corresponding control voltage through optimization iteration, adaptively adjust the expansion / compression and inflection point of the simulated pre-distortion amplitude and phase curve, and realize the function of adaptive adjustment.

[0143] Fig.15The fourth signal transmission system 4000 provided in an embodiment of the present application is shown, and the fourth signal transmission system 4000 may include the phase modulation circuit 100, the amplitude modulation circuit 200, the driving amplifier 300, and the power amplifier 400 in the first signal transmission system 1000. The fourth signal transmission system 4000 may also include a second control circuit 800, and the second control circuit 800 may be used to control the adjustment schemes of the aforementioned different adjustment circuits.

[0144] Here, the phase modulation circuit 100, the amplitude modulation circuit 200 and the driving amplifier 300 can be cascaded in sequence, or the amplitude modulation circuit 200, the phase modulation circuit 100 and the driving amplifier 300 can be cascaded in sequence. The following example mainly describes the former case, and the latter case can be executed for reference.

[0145] In some examples, the fourth signal transmission system 4000 may include a power divider 700, and an input signal input to the fourth signal transmission system 4000 is first input to the power divider 700, a first portion of the input signal is input to the second control circuit 800, and a second portion of the input signal is input to the phase modulation circuit 100. Here, the first portion of the input signal may be used as an original signal, and in combination with the output signal of the power amplifier 400, the second control circuit 800 may determine the difference between the original signal and the output signal of the power amplifier 400, thereby generating an error signal.

[0146] In some examples, the fourth signal transmission system 4000 may include a power divider 700, and an input signal input to the fourth signal transmission system 4000 is first input to the power divider 700, a first portion of the input signal is input to the second control circuit 800, and a second portion of the input signal is input to the amplitude modulation circuit 200. Here, the first portion of the input signal may be used as an original signal, and in combination with the output signal of the power amplifier 400, the second control circuit 800 may determine the difference between the original signal and the output signal of the power amplifier 400, thereby generating an error signal.

[0147] The second control circuit 800 may be connected to the first control port of the phase modulation circuit 100 and the second control port of the amplitude modulation circuit 200 respectively, and send control signals to corresponding circuit components through these control ports.

[0148] In some examples, the second control circuit 800 may also control the power of an input signal input to the fourth signal transmitting system 4000 , etc.

[0149] In some examples, the second control circuit 800 can generate a control signal according to the analog predistortion and the power amplifier output, output a control voltage through a control algorithm, and adaptively adjust the analog predistortion amplitude to achieve the purpose of adaptive regulation.

[0150] In some scenarios, the power divider 700, the phase modulation circuit 100, the amplitude modulation circuit 200, the driving amplifier 300 and the second control circuit 800 in the fourth signal transmission system 4000 can constitute a fourth signal modulation circuit 4100. The fourth signal modulation circuit 4100 can adaptively modulate the phase and amplitude of the signal input to the power amplifier 400 according to the application scenario.

[0151] In some scenarios, the second control circuit 800 may also be referred to as a second control module 800 .

[0152] The structure of the second control circuit 800 is similar to that of the first control circuit 600, and may include an alignment circuit, a high-speed differential operation circuit, a peak detection circuit, a segmentation circuit, and a controllable integration circuit. The detailed description of the relevant circuits can refer to the description of the corresponding circuits in the first control circuit 600 in the previous text, and will not be repeated here for the sake of brevity.

[0153] The second control circuit 800 can generate an error signal according to the original signal and the output signal of the power amplifier 400, and generate an output control voltage by optimizing the control algorithm. The optimization algorithm can be written according to the actual situation of the power amplifier to realize real-time monitoring and analysis of the output power and phase and amplitude distortion characteristics of the power amplifier, and update the corresponding control voltage through optimization iteration, adaptively adjust the analog pre-distortion amplitude, and realize the function of adaptive adjustment.

[0154] The above describes various signal transmission systems and signal modulation circuits provided by the present application from the perspective of the structure of the signal transmission system. Fig.13 In the process from inputting a signal to transmitting a signal in the third signal transmitting system 3000 shown, the change of the input signal further illustrates the signal transmitting system and signal modulation circuit provided by the present application.

[0155] Signal 1 (sg1) is input to the power divider 700. In some examples, the signal 1 may be a radio frequency signal, such as A·exp(j*φ).

[0156] After passing through the power divider 700, the signal can be divided into two signals, for example, signal 2 (sg2) and signal 3 (sg3). Signal 2 is input to the phase modulation circuit 100, and signal 3 is input to the first control circuit 600. Compared with signal 1, the relative phases of signal 2 and signal 3 remain unchanged, and the amplitudes of signal 2 and signal 3 are changed.

[0157] The signal 2 is input to the phase modulation circuit 100, and a signal 4 (sg4) can be obtained after being adjusted by the phase modulation circuit 100. Compared with the signal 2, the amplitude of the signal 4 remains unchanged, but the phase changes.

[0158] The input signal 4 is sent to the first inflection point modulation module 500A, and the signal 5 (sg5) is modulated by the first inflection point modulation module 500A. Compared with the signal 4, the amplitude of the signal 5 remains unchanged, but the phase inflection point changes.

[0159] The input signal 5 is input to the amplitude modulation circuit 200, and the signal 6 (sg6) is obtained by modulation by the amplitude modulation circuit 200. Compared with the signal 5, the phase and the phase inflection point of the signal 6 remain unchanged, but the amplitude changes.

[0160] The input signal 6 is sent to the second inflection point modulation module 500B, and the signal 7 (sg7) is obtained after being modulated by the second inflection point modulation module 500B. Compared with the signal 6, the phase and amplitude of the signal 7 remain unchanged, but the phase inflection point and the amplitude inflection point change.

[0161] The input signal 7 is input to the driving amplifier 300, and after being adjusted by the driving amplifier 300, a signal 8 (sg8) can be obtained. Compared with the signal 7, the relative phase of the signal 8 remains unchanged, but the amplitude changes.

[0162] The input signal 8 is input to the power amplifier 400, and after being adjusted by the power amplifier 400, a signal 9 (sg9) can be obtained. Compared with the signal 8, the phase of the signal 9 remains unchanged, but the amplitude changes.

[0163] Signal nine passes through the coupler to obtain a distortion detection signal, namely signal ten (sg10). Compared with signal nine, the phase of signal ten remains unchanged, but the amplitude changes.

[0164] Signal three and signal ten are input to the first control circuit 600. The control voltages of the aforementioned circuit components can be obtained through an optimized iterative algorithm. The working state of the third signal transmission system 3000 is adjusted by updating the control voltages of the various circuit components, thereby realizing an adaptive adjustment function.

[0165] Based on the third signal transmitting system 3000 or the fourth signal transmitting system 4000, as Fig.16 As shown, the present application also provides a signal modulation method, wherein the signal modulation circuit can determine a control signal based on feedback of an input signal and a transmission signal, and use the control signal to control the modulation scheme of the input signal, and modulate the phase and / or amplitude of the input signal separately.

[0166] S110, receiving a feedforward signal and a feedback signal.

[0167] The feedforward signal may be part of the input to the signal transmission system, e.g. Fig.13 Signal 3 (sg3) in the illustrated embodiment. In some examples, the feedforward signal may be sent to the control circuit by a power splitter in the signal transmission system.

[0168] The feedback signal can also be called a distortion detection signal, e.g. Fig.13 Signal ten (sg10) in the illustrated embodiment. In some examples, a portion of the output signal of the power amplifier of the signal transmission system can be coupled out as a feedback signal and sent to the control circuit.

[0169] Here, the control circuit may be the first control circuit 600 or the second control circuit 800 in the aforementioned embodiment, which is used to send a control signal to a circuit component in the signal modulation circuit.

[0170] S120, determining a control signal according to the feedforward signal and the feedback signal.

[0171] In some examples, the control circuit can determine the difference between the feedforward signal and the feedback signal and generate an error signal. Based on the error signal, the control circuit can generate a control signal, which can be used to control one or more of a phase modulation circuit, an amplitude modulation circuit, or a variable gain amplifier in the signal modulation circuit.

[0172] The control circuit may generate a corresponding control signal according to the modulation circuit included in the signal modulation circuit. For example, for the aforementioned first control circuit 600, the first control circuit 600 may generate five control voltage signals, V P 、V PM 、V C1 、V AM and V C2 , and are used to control: input power, phase modulation circuit, first inflection point modulation module, amplitude modulation circuit and second inflection point modulation module. Similarly, for the aforementioned second control circuit 800, the second control circuit can generate three control voltage signals, V P 、V PM , and V AM , and are used to control: input power, phase modulation circuit and amplitude modulation circuit respectively.

[0173] In some examples, the control circuit may include one or more of an alignment circuit, a high-speed differential operation circuit, a peak detection circuit, a segmentation circuit, and a controllable integration circuit, and generate the aforementioned control signal based on these circuits.

[0174] In some examples, the control circuit may be connected to control ports between the multiple modulation circuits, and send corresponding control signals to the multiple modulation circuits through the control ports.

[0175] S130, modulating the input signal according to the control signal.

[0176] After receiving the corresponding control signal, the modulation of the input signal by different modulation circuits will change accordingly.

[0177] Exemplarily, the phase modulation circuit 100 receives different control voltage signals V PM , the phase difference between the output signal of the phase modulation circuit 100 and the input signal will change accordingly.

[0178] Similarly, illustratively, the amplitude modulation circuit 200 receives different control voltage signals V AM Afterwards, the difference between the amplitude of the output signal of the amplitude modulation circuit 200 and the amplitude of the input signal will change accordingly.

[0179] Still exemplarily, the first inflection point modulation module 500A receives different control voltage signals V C1 After that, the position of the phase inflection point between the output signal and the input signal will change accordingly.

[0180] After being modulated by the signal modulation circuit, the input signal is input to the power amplifier of the signal transmission system, and the power amplifier amplifies the power of the signal and then sends it to achieve signal transmission. Since the modulation scheme of the input signal is determined based on the feedforward signal and the feedback signal, the linearity of the signal input to the power amplifier after modulation by the scheme is better when it is output by the power amplifier. Accordingly, the information loss of the signal transmitted by the signal transmission system is smaller, the noise is less, and the communication quality of the signal is higher.

[0181] Based on similar principles, Fig.17 The figure shows a signal modulation device 1700 provided in an embodiment of the present application. The signal modulation device 1700 may have the function of the signal modulation circuit in the above method embodiment, and may be used to execute the steps executed by the function of the signal modulation circuit in the above method embodiment. The function may be implemented by hardware, or by software or hardware executing corresponding software implementation. The hardware or software includes one or more modules corresponding to the above functions.

[0182] In a possible implementation, the signal modulation device 1700 may include a communication module 1710 and a processing module 1720 , and the communication module 1710 and the processing module 1720 are coupled to each other.

[0183] The communication module 1710 can be used to support operations such as the signal modulation circuit acquiring input signals and sending control signals.

[0184] The processing module 1720 is used to support the signal modulation circuit to perform the processing actions in the above method embodiments, such as generating an error signal, generating a control signal, etc.

[0185] Optionally, the signal modulation device 1700 may further include a storage unit 1730 for storing program codes and data of the signal modulation device 1700 .

[0186] Fig.18 An electronic device 1800 provided in an embodiment of the present application, as shown in the figure, includes: at least one processor 1810 and a transceiver 1820. The processor 1810 is coupled to a memory and is used to execute instructions stored in the memory to control the transceiver 1820 to send and / or receive signals.

[0187] Optionally, the electronic device 1800 further includes a memory 1830 for storing instructions.

[0188] In some embodiments, the processor 1810 and the memory 1830 may be combined into a processing device, and the processor 1810 is used to execute the program code stored in the memory 1830 to implement the above functions. In specific implementation, the memory 1830 may also be integrated into the processor 1810 or independent of the processor 1810.

[0189] In some embodiments, the transceiver 1820 may include a receiver (or receiver) and a transmitter (or transmitter).

[0190] The transceiver 1820 may further include an antenna, and the number of antennas may be one or more. The transceiver 1820 may be a communication interface or an interface circuit.

[0191] When the electronic device 1800 is a chip, the chip includes a transceiver module and a processing module, wherein the transceiver module may be an input / output circuit or a communication interface; and the processing module may be a processor or a microprocessor or an integrated circuit integrated on the chip.

[0192] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0193] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0194] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0195] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0196] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0197] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage media include: various media that can store program codes, such as USB flash drives, mobile hard disks, read-only memories (ROM), random access memories (RAM), magnetic disks or optical disks.

[0198] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A signal modulation circuit, characterized in that: include: Phase modulation module, amplitude modulation module and drive amplifier module, The phase modulation module, the amplitude modulation module and the driving amplifier module are cascaded in sequence, or, The amplitude modulation module, the phase modulation module and the driving amplification module are cascaded in sequence; The phase modulation module is used to modulate the phase of the input signal alone, the amplitude modulation module is used to modulate the amplitude of the input signal alone, and the drive amplifier module is used to increase the power output of the modulated input signal.

2. The signal modulation circuit according to claim 1, characterized in that: The signal modulation circuit further includes: a first modulation module and a second modulation module, The first modulation module is connected between the phase modulation module and the amplitude modulation module, the second modulation module is connected between the amplitude modulation module and the driving amplification module, the first modulation module is used to modulate the phase inflection point of the input signal, and the second modulation module is used to modulate the phase inflection point and the amplitude inflection point of the input signal; or, The first modulation module is connected between the amplitude modulation module and the phase modulation module, the second modulation module is connected between the phase modulation module and the driving amplification module, the first modulation module is used to modulate the amplitude inflection point of the input signal, and the second modulation module is used to modulate the amplitude inflection point and phase inflection point of the input signal.

3. The signal modulation circuit according to claim 1 or 2, characterized in that: The signal modulation circuit further includes a control module, The control module is used to control one or more of the following: The phase modulation module, the amplitude modulation module, the first modulation module or the second modulation module.

4. The signal modulation circuit according to claim 3, characterized in that: The signal modulation circuit also includes a power division module. The power division module is connected to the phase modulation module and the control module, and is used to divide the input signal into a first sub-input signal input to the phase modulation module and a second sub-input signal input to the control module; or, The power division module is connected to the amplitude modulation module and the control module, and is used to divide the input signal into a first sub-input signal input to the amplitude modulation module and a second sub-input signal input to the control module.

5. The signal modulation circuit according to claim 3 or 4, characterized in that: The control module is also used to control the input power of the input signal.

6. The signal modulation circuit according to any one of claims 1 to 5, characterized in that: The phase modulation module includes a first transistor, a first inductor and a second inductor. The first inductor is coupled to the second inductor, two ends of the first inductor are respectively connected to the emitter and collector of the first transistor, and two ends of the second inductor are respectively connected to the input port and output port of the phase modulation module; The base of the first transistor is connected to the control port of the phase modulation module.

7. The signal modulation circuit according to any one of claims 1 to 6, characterized in that: The amplitude modulation module includes a second transistor, a third transistor and a third inductor. The base of the second transistor is connected to the input port of the amplitude modulation module, and the emitter of the second transistor is grounded; The base of the third transistor is connected to the output port of the amplitude modulation module, and the emitter of the third transistor is grounded; Two ends of the third inductor are connected to the collector of the second transistor and the collector of the third transistor respectively.

8. A signal transmission system, characterized in that: include: Phase modulation module, amplitude modulation module, drive amplifier module and power amplifier, The phase modulation module, the amplitude modulation module and the driving amplifier module are cascaded in sequence, or, The amplitude modulation module, the phase modulation module and the driving amplification module are cascaded in sequence; The phase modulation module is used to modulate the phase of the input signal alone, the amplitude modulation module is used to modulate the amplitude of the input signal alone, and the drive amplifier module is used to increase the power of the modulated input signal and output it to the power amplifier; The power amplifier is used for transmitting signals.

9. The signal transmission system according to claim 8, characterized in that: The signal transmission system further includes: a first modulation module and a second modulation module, The first modulation module is connected between the phase modulation module and the amplitude modulation module, the second modulation module is connected between the amplitude modulation module and the driving amplification module, the first modulation module is used to modulate the phase inflection point of the input signal, and the second modulation module is used to modulate the phase inflection point and the amplitude inflection point of the input signal, or, The first modulation module is connected between the amplitude modulation module and the phase modulation module, the second modulation module is connected between the phase modulation module and the driving amplification module, the first modulation module is used to modulate the amplitude inflection point of the input signal, and the second modulation module is used to modulate the amplitude inflection point and phase inflection point of the input signal.

10. The signal transmission system according to claim 8 or 9, characterized in that: The signal transmission system also includes a power division module and a control module. The power division module is connected to the phase modulation module and the control module, and is used to divide the input signal into a first sub-input signal input to the phase modulation module and a second sub-input signal input to the control module, or, The power division module is connected to the amplitude modulation module and the control module, and is used to divide the input signal into a first sub-input signal input to the amplitude modulation module and a second sub-input signal input to the control module; The control module is used to control one or more of the following according to the feedback signal and the second sub-input signal: The phase modulation module, the amplitude modulation module, the first modulation module or the second modulation module; The feedback signal is obtained by coupling the transmission signal of the power amplifier.

11. The signal transmission system according to claim 10, characterized in that: The control module is specifically used for: generating one or more control signals according to the feedback signal and the second sub-input signal; The control signal is sent to one or more of the following: the phase modulation module, the amplitude modulation module, the first modulation module or the second modulation module.

12. The signal transmission system according to claim 11, characterized in that: The control module includes an alignment submodule and a signal generation submodule. The alignment submodule is used to align the second sub-input signal with the phase and / or amplitude of the feedback signal, and output the aligned signal to the signal generation submodule. The signal generation submodule is used to generate the control signal according to the aligned signal.

13. A signal modulation method, characterized in that: include: receiving a feedforward signal and a feedback signal, wherein the feedback signal is obtained by coupling a transmission signal of a power amplifier, and the feedforward signal is a part of an input signal; generating a control signal according to the feedforward signal and the feedback signal, the control signal comprising a first sub-control signal and / or a second sub-control signal, the first sub-control signal being used to control the phase of the input signal to be modulated separately, and the second sub-control signal being used to control the amplitude of the input signal to be modulated separately; The input signal is modulated according to the control signal.

14. The signal modulation method according to claim 13, characterized in that: The control signal also includes a third sub-control signal and / or a fourth sub-control signal, the third sub-control signal is used to control the modulation of the phase inflection point or the amplitude inflection point of the input signal, and the fourth sub-control signal is used to control the modulation of the phase inflection point and the amplitude inflection point of the input signal.

15. The signal modulation method according to claim 13 or 14, characterized in that: The control signal further includes a fifth sub-control signal, and the fifth sub-control signal is used to control the power of the input signal.

16. A signal modulation device, characterized in that: The method comprises modules for implementing the method according to any one of claims 13 to 15.

17. A chip, characterized in that: The chip comprises a processor and a memory, wherein the processor is used to read instructions stored in the memory, and when the processor executes the instructions, the chip implements the method according to any one of claims 13 to 15.

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