Envelope tracking modulator, transmitting device and terminal equipment

Abstract

The invention discloses an envelope tracking modulator, a transmitting device and terminal equipment, which are used for improving the efficiency of tracking bandwidth signals. The envelope tracking modulator comprises a converter, a power supply processing circuit, a linear amplifier and a switching amplifier, the converter is used for providing various power supply voltages, and the power supply processing circuit is used for dynamically determining a target power supply voltage of the linear amplifier according to the power supply voltage with the minimum voltage difference with an input envelope signal in the various power supply voltages. The linear amplifier is used for carrying out linear amplification on an input envelope signal under the bias of a target power supply voltage, and the switching amplifier is used for carrying out current amplification on an output signal of the linear amplifier. By arranging the multiple power supplies and dynamically selecting the power supply which enables the current of the linear amplifier to pass through the minimum voltage drop in the multiple power supplies, the power supply voltage of the linear amplifier can be dynamically changed along with the output envelope requirement, and on the basis of keeping a better bandwidth tracking effect, the modulation loss can be reduced and the modulation efficiency can be improved.

Description

Technical Field

[0001] The present application relates to the field of chip technology, and in particular to an envelope tracking modulator, a transmitting device and a terminal device. Background Art

[0002] The power amplifier (PA), as a radio frequency power amplifier, is the most important device in the transmission link of modern communication systems. Its main function is to amplify the low-power signal processed by the front-end circuit to the rated power level specified by the communication system standard, and then feed it into the back-end devices, such as duplexers, antennas, etc., for wireless transmission.

[0003] With the development of chip technology, envelope tracking (ET) technology has been proposed to reduce the amplification loss of PA. ET technology is a technology that dynamically adjusts the power supply voltage of PA in real time according to the envelope amplitude information of the modulation signal, which can improve the amplification efficiency of PA and reduce the amplification loss of PA. ET technology has been applied in mobile terminal equipment since early 2010. In theory, it can greatly reduce the power consumption of the RF front end in mobile terminal equipment and significantly improve the energy conversion efficiency of the RF front end. It is considered by the industry to be one of the indispensable important features of 5G, 5.5G or future 6G terminals.

[0004] Currently, most ET solutions in existing mobile terminal devices use a hybrid envelope tracking modulator (ETM) architecture that uses a switching amplifier coupled to a class AB linear amplifier (LA). Figure 1a , where the AB class LA is used to provide envelope high-frequency energy to achieve a linear relationship between input and output, and the switching amplifier is used to provide DC and low-frequency energy. The combined effect of the AB class LA and the switching amplifier can ensure the system bandwidth. However, the AB class LA will simultaneously generate a common current (I sourcing ) losses and absorption current (I sinking ) loss, the AB class LA itself will also generate bias current (I bias ) loss. These three losses are the main losses of the system when tracking broadband signals, which makes ETM unable to provide high-frequency energy efficiently, thereby reducing the efficiency of ETM in tracking broadband signals. Although it is also possible to reduce I by increasing the switching frequency of the switching amplifier, sourcing Loss and I sinking However, when the signal bandwidth is high, the switching frequency required is too high, so that the switching loss of the switching amplifier itself is too large, which deteriorates the system efficiency. Alternatively, see Figure 1bAlthough a microfarad (uF) capacitor can be added between the output of the class AB LA and the output of the ETM for coupling, so that the entire system forms an AC coupling architecture, so as to use the capacitor to reduce the power supply voltage of the class AB LA and avoid the class AB LA outputting DC current, this architecture has a limited effect on improving efficiency and cannot adapt to the power supply requirements in different envelope tracking scenarios.

[0005] In summary, there is an urgent need for an envelope tracking modulator to effectively improve the efficiency of tracking bandwidth signals. Summary of the invention

[0006] The present application provides an envelope tracking modulator, a transmitting device and a terminal device, which are used to effectively improve the efficiency of tracking bandwidth signals.

[0007] In a first aspect, the present application provides an envelope tracking modulator, including a converter, a power supply processing circuit, a linear amplifier and a switching amplifier, wherein the power supply processing circuit is coupled to the converter and the linear amplifier respectively, and the linear amplifier is also coupled to the switching amplifier. The converter is used to provide a plurality of power supply voltages to the power supply processing circuit; the power supply processing circuit is used to determine the target power supply voltage of the linear amplifier at each moment according to the plurality of power supply voltages and the voltage of the input envelope signal at each moment, and the target power supply voltage at any moment is determined according to the power supply voltage with the smallest voltage difference with the input envelope signal at the moment among the plurality of power supply voltages; the linear amplifier is used to linearly amplify the input envelope signal under the bias of the target power supply voltage, generate a first output signal and provide it to the power amplifier; the switching amplifier is used to current amplify the first output signal, generate a second output signal and provide it to the power amplifier.

[0008] In the above design, multiple power supplies are set in the envelope tracking modulator, and the power supply with the smallest voltage drop across the linear amplifier current is dynamically selected to generate the target power supply of the linear amplifier. This can not only ensure that the linear amplifier has sufficient power supply capacity to generate the envelope signal, but also minimize the voltage drop of the linear amplifier at each modulation moment, thereby significantly reducing the common current (I sourcing ), absorption current (I sinking ) losses and bias current (I bias ) voltage drop, effectively improving the modulation efficiency of the envelope tracking modulator. In addition, since the power processing circuit selects the same voltage as the input envelope signal V in The voltage dropout is minimized to generate the target power supply voltage of the linear amplifier. Therefore, when the input envelope signal V inAfter the change, the target power supply voltage of the linear amplifier will also change accordingly. In other words, the target power supply voltage of the linear amplifier can change dynamically with the output envelope requirements, so that the envelope tracking modulator can adapt to the power supply requirements in various envelope tracking scenarios. In addition, the envelope tracking modulator achieves the purpose of reducing power consumption by adjusting the power supply voltage of the linear amplifier without increasing the switching frequency of the switching amplifier, thereby not increasing additional switching losses and maintaining good high-bandwidth tracking feasibility.

[0009] In a possible design, the target power supply voltage of the linear amplifier at any time is a DC voltage or a voltage that changes with the input envelope signal. For example, at a certain moment, if the minimum power supply voltage or the maximum ground supply voltage that can be provided in the envelope tracking modulator is sufficient to provide the energy required for the linear amplifier modulation, the minimum power supply voltage or the maximum ground supply voltage can be directly provided to the linear amplifier. At this time, although the power supply voltage of the linear amplifier is a DC voltage, this voltage is the minimum power supply voltage or the maximum ground supply voltage that can be provided in the envelope tracking modulator, so the power loss of the linear amplifier at the power supply end or the ground supply end actually reaches the minimum in the achievable solution. On the contrary, at a certain moment, if the minimum power supply voltage that can be provided in the envelope tracking modulator is not sufficient to provide the energy required for the linear amplifier modulation, the minimum power supply voltage or the maximum power supply voltage that is sufficient to provide the energy required for the linear amplifier modulation can be modulated into a power supply voltage that follows the input envelope signal through the power supply processing circuit, so that the linear amplifier can use the power supply voltage that itself follows the input envelope signal to modulate the output signal that follows the input envelope signal, and thus the power supply voltage used in the modulation process at each moment belongs to the power supply voltage that minimizes the voltage drop across the linear amplifier, thereby effectively saving the power supply loss of the linear amplifier in the entire modulation process.

[0010] In a possible design, the multiple power supply voltages satisfy any of the following situations: situation 1, the multiple power supply voltages include multiple power supply voltages, but do not include a ground supply voltage; situation 2, the multiple power supply voltages include one power supply voltage and at least one ground supply voltage; situation 3, the multiple power supply voltages include multiple power supply voltages and at least one ground supply voltage. Among them, the minimum ground supply voltage of at least one ground supply voltage is greater than the ground voltage. In other words, the converter can provide multiple power supplies and / or at least one ground supply, so that the envelope tracking modulator can adapt to a variety of power supply occasions.

[0011] In a possible design, when the multiple power supply voltages include a first power supply voltage to an Nth power supply voltage whose voltage values ​​increase sequentially, the target power supply voltage includes a target power supply voltage. When the minimum power supply voltage among the first power supply voltage to the Nth power supply voltage that is greater than the voltage of the input envelope signal at the first moment is the first power supply voltage, the target power supply voltage of the linear amplifier at the first moment is a DC voltage, which is determined according to the first power supply voltage. For example, considering the power loss, the DC voltage may be slightly less than the first power supply voltage. Conversely, when the minimum power supply voltage among the first power supply voltage to the Nth power supply voltage that is greater than the voltage of the input envelope signal at the first moment is not the first power supply voltage, the target power supply voltage of the linear amplifier at the first moment is a voltage that changes with the input envelope signal.

[0012] With the above design, the envelope tracking modulator can not only have sufficient power supply capacity to generate an envelope signal, but also reduce the modulation voltage drop by reducing the voltage at the power supply end of the linear amplifier, thereby reducing the modulation loss at the power supply end and effectively improving the modulation efficiency.

[0013] In a possible design, the multiple power supply voltages include at least one ground power supply voltage, and when the ground power supply voltage is greater than the ground voltage, the target power supply voltage includes the target ground power supply voltage. When the maximum voltage of at least one ground power supply voltage and the ground voltage that is less than the voltage of the input envelope signal at the first moment is the minimum ground power supply voltage of at least one ground power supply voltage, the target ground power supply voltage of the linear amplifier at the first moment is a DC voltage, and the DC voltage is determined according to the minimum ground power supply voltage. When the maximum voltage of at least one ground power supply voltage and the ground voltage that is less than the voltage of the input envelope signal at the first moment is not the minimum ground power supply voltage of at least one ground power supply voltage, the target ground power supply voltage of the linear amplifier at the first moment is a voltage that changes with the input envelope signal.

[0014] With the above design, the envelope tracking modulator can not only have sufficient power supply capacity to generate an envelope signal, but also reduce the modulation voltage drop by reducing the voltage at the ground power supply end of the linear amplifier, thereby reducing the modulation loss at the ground power supply end and effectively improving the modulation efficiency.

[0015] In a possible design, the converter may include first to N-th output terminals, which are used to output first to N-th power supply voltages with increasing voltage values, where N is an integer greater than or equal to 2. In this case, the power processing circuit includes a first subcircuit, wherein the first to N-th power supply input terminals of the first subcircuit are coupled to the first to N-th output terminals of the converter in a one-to-one correspondence, and the signal input terminal of the first subcircuit is coupled to the first signal input terminal of the linear amplifier for receiving an input envelope signal; the power output terminal of the first subcircuit is coupled to the power supply input terminal of the linear amplifier, and the second signal input terminal of the linear amplifier is coupled to the signal output terminal of the linear amplifier. When the power processing circuit is working, the first sub-circuit is used to determine, at any moment, a minimum power supply voltage that is greater than the voltage corresponding to the input envelope signal at the moment according to the first power supply voltage to the Nth power supply voltage; if the minimum power supply voltage is the first power supply voltage, the first power supply voltage is provided to the linear amplifier; if the minimum power supply voltage is not the first power supply voltage, the minimum power supply voltage is modulated to generate a power supply signal that follows the input envelope signal and provide the power supply signal to the linear amplifier.

[0016] In the above design, by configuring the first sub-circuit in the power processing circuit, adaptive selection of multiple power supply voltages can be achieved. For example, the power supply voltage with the lowest power consumption can be selected from multiple power supply voltages to provide to the linear amplifier, thereby reducing the energy loss at the power supply end during the modulation process.

[0017] In further possible designs, the structure of the first sub-circuit may be various, such as:

[0018] Possible structure 1, when the value of N is 2, the first subcircuit may include a first voltage regulator and a first diode, the power input end of the first diode is the first power input end of the first subcircuit, the power input end of the first voltage regulator is the second power input end of the first subcircuit, the first signal input end of the first voltage regulator is the first signal input end of the first subcircuit, and the second signal input end of the first voltage regulator, the power output end of the first voltage regulator and the power output end of the first diode are coupled as the power output end of the first subcircuit. When the first subcircuit is working, the first diode is used to conduct when the voltage corresponding to the input envelope signal is less than the first power supply voltage, and to cut off when the voltage corresponding to the input envelope signal is greater than or equal to the first power supply voltage, the first voltage regulator is used to turn off when the voltage corresponding to the input envelope signal is less than the first power supply voltage, and to turn on when the voltage corresponding to the input envelope signal is greater than or equal to the first power supply voltage and less than the second power supply voltage, and, in the turned-on state, modulate the second power supply voltage to generate a power signal that follows the input envelope signal and provides it to the linear amplifier.

[0019] Possible structure two, when the value of N is an integer greater than or equal to 3, the first subcircuit may include N-1 first regulators and N-1 first diodes corresponding to the N-1 first regulators one by one, wherein the N-1 first regulators are connected in series in sequence, the power input end of the previous first regulator is coupled to the power output end of the next first regulator, the power output end of the first regulator located at the head end of the series connection is the power output end of the first subcircuit, the power input end of the first regulator located at the tail end of the series connection is the Nth power input end of the first subcircuit, the first signal input ends of the N-1 first regulators are coupled as the signal input end of the first subcircuit, the power input ends of the N-1 first diodes correspond to the first power input end to the N-1th power input end of the first subcircuit, and the power output end of any first diode is coupled to the power output end of the corresponding first regulator and then connected to the second signal input end of the corresponding first regulator. When the first subcircuit is working, any first diode is used to conduct when the voltage corresponding to the input envelope signal is less than the power supply voltage received by the first diode, and cut off when the voltage corresponding to the input envelope signal is greater than or equal to the power supply voltage received by the first diode, and any first voltage regulator is used to turn off when the voltage corresponding to the input envelope signal is less than the power supply voltage received by the corresponding first diode, turn on when the voltage corresponding to the input envelope signal is greater than or equal to the power supply voltage received by the corresponding first diode and less than the next power supply voltage, and, in the turned-on state, modulate the next power supply voltage to generate a power supply signal that follows the input envelope signal and provide it to the linear amplifier. Wherein, the next power supply voltage is the minimum power supply voltage among the N power supply voltages that is greater than the power supply voltage received by the corresponding first diode.

[0020] Possible structure three, when the value of N is an integer greater than or equal to 3, the first subcircuit may include a first diode and N-1 first voltage regulators, the power input end of the first diode is the first power input end of the first subcircuit, the power input ends of the N-1 first voltage regulators correspond to the second power input end of the first subcircuit to the Nth power selection end, the first signal input ends of the N-1 first voltage regulators are coupled as the signal input end of the first subcircuit, the second signal input ends of the N-1 first voltage regulators, the power output ends of the N-1 first voltage regulators and the power output end of the first diode are coupled as the power output end of the first subcircuit; wherein the previous power supply voltage is the maximum power supply voltage among the N power supply voltages that is less than the power supply voltage received by the first voltage regulator. Moreover, any first voltage regulator also includes an enable end, which is used to receive an enable signal, and the enable signal is used to control the first voltage regulator to turn on when the voltage corresponding to the input envelope signal is less than the power supply voltage received by the first voltage regulator and greater than the previous power supply voltage. When the first subcircuit is working, the first diode is used to be turned on when the voltage corresponding to the input envelope signal is less than the first power supply voltage, and is turned off when the voltage corresponding to the input envelope signal is greater than or equal to the first power supply voltage. Any first voltage regulator is used to modulate the power supply voltage received by the first voltage regulator in the turned-on state, generate a power supply signal that follows the input envelope signal and provide it to the linear amplifier.

[0021] In the above design, possible structure 1 can select the currently available smaller power supply voltage from two power supply voltages to generate the power supply voltage of the linear amplifier, possible structure 2 uses a series structure, and possible structure 3 uses a parallel structure, both of which can select the currently available smallest power supply voltage from at least three power supply voltages to generate the power supply voltage of the linear amplifier, and all three structures can reduce the modulation loss of envelope tracking from the power supply end. In addition, by configuring a voltage regulator in the above three structures, the power supply signal of the linear amplifier can be modulated into an AC signal that follows the input envelope signal through the voltage regulator, thereby achieving the effect of low distortion and high linearity.

[0022] In a further possible design of the above possible structure three, the first subcircuit may also include N-1 first enabling circuits corresponding one-to-one to the N-1 first voltage regulators. For any first enabling circuit: it may include a first comparator, a second comparator and a first AND gate, the positive input terminal of the first comparator is used to receive the power supply voltage received by the first voltage regulator, the negative input terminal of the first comparator is used to receive the input envelope signal, and the output terminal of the first comparator is coupled to an input terminal of the first AND gate; the negative input terminal of the second comparator is used to receive the previous power supply voltage, the positive input terminal of the second comparator is used to receive the input envelope signal, and the output terminal of the second comparator is coupled to the other input terminal of the first AND gate; the output terminal of the first AND gate is coupled to the enable terminal of the corresponding first voltage regulator.

[0023] In the above design, comparators and AND gates are relatively common logic devices with simple control logic and low cost. Therefore, by using comparators and AND gates to implement the function of the first enabling circuit, the cost and complexity of the envelope tracking modulator can be reduced.

[0024] In a possible design, the converter may include a first input terminal to an Mth input terminal, and the first input terminal to the Mth input terminal are used to provide a first ground power supply voltage to an Mth ground power supply voltage with voltage values ​​decreasing in sequence, and M is a positive integer. In this case, the power supply processing circuit may include a second subcircuit, a first signal input terminal of the linear amplifier is coupled to a signal input terminal of the second subcircuit, and is used to receive an input envelope signal; a second signal input terminal of the linear amplifier is coupled to a signal output terminal of the linear amplifier, a ground power supply input terminal of the linear amplifier is coupled to a power output terminal of the second subcircuit, and the first power supply input terminal to the Mth power supply input terminal of the second subcircuit are coupled to the first input terminal to the Mth input terminal of the converter in a one-to-one correspondence. When the power supply processing circuit is working, the second subcircuit is used to determine a maximum voltage that is less than the voltage of the input envelope signal at any time according to the first ground power supply voltage to the Mth ground power supply voltage and the ground voltage, and if the maximum voltage is the first ground power supply voltage, the first ground power supply voltage is provided to the linear amplifier; if the minimum voltage is not the first ground power supply voltage, the minimum voltage is modulated to generate a power supply signal that follows the input envelope signal and is provided to the linear amplifier.

[0025] In the above design, by configuring the second sub-circuit in the power supply processing circuit, adaptive selection of at least one ground power supply voltage and the ground voltage can be achieved. For example, a voltage with the lowest power consumption can be selected from at least one ground power supply voltage and the ground voltage to generate the power supply voltage of the linear amplifier, thereby reducing the energy loss at the ground power supply end during the modulation process.

[0026] In further possible designs, the structure of the second sub-circuit may be various, such as:

[0027] Possible structure 1, when the value of M is 1, the second subcircuit may include a second voltage regulator and a second diode. After the power output end of the second voltage regulator, the power output end of the second diode and the second signal input end of the second voltage regulator are coupled, they serve as the power output end of the second subcircuit. The power input end of the second diode is the power input end of the second subcircuit. The first signal input end of the second voltage regulator is the first signal input end of the second subcircuit. The power input end of the second voltage regulator is grounded. When the second subcircuit is working, the second diode is used to conduct when the voltage corresponding to the input envelope signal is greater than the ground power voltage provided by the converter, and is cut off when the voltage corresponding to the input envelope signal is less than or equal to the ground power voltage provided by the converter. The second voltage regulator is used to turn off when the voltage corresponding to the input envelope signal is greater than the ground power voltage provided by the converter, and turn on when the voltage corresponding to the input envelope signal is less than or equal to the ground power voltage provided by the converter and greater than the ground voltage. In addition, in the turned-on state, the ground voltage is modulated to generate a power signal that follows the input envelope signal and is provided to the linear amplifier.

[0028] Possible structure two, when the value of M is an integer greater than or equal to 2, the second sub-circuit may include M second voltage regulators and M second diodes corresponding to the M second voltage regulators one by one, the power input ends of the M second diodes correspond to the first power input end to the Mth power input end of the second sub-circuit, and the first signal input ends of the M second voltage regulators are coupled to serve as the signal input end of the second sub-circuit; the M second voltage regulators are connected in series in sequence, and the power input end of the previous second voltage regulator is coupled to the power output end of the next second voltage regulator, the second signal input end of the next second voltage regulator and the power output end of the corresponding second diode respectively, the power output end of the second voltage regulator located at the head end of the series connection and the second signal input end of the second voltage regulator located at the head end of the series connection are coupled with the power output end of the corresponding second diode to serve as the power output end of the second sub-circuit, and the power input end of the second voltage regulator located at the tail end of the series connection is grounded. When the second subcircuit is working, any second diode is used to be turned on when the voltage corresponding to the input envelope signal is greater than the ground power voltage received by the second diode, and turned off when the voltage corresponding to the input envelope signal is less than or equal to the ground power voltage received by the second diode; any first voltage regulator is used to be turned off when the voltage corresponding to the input envelope signal is greater than the ground power voltage received by the corresponding second diode, and turned on when the voltage corresponding to the input envelope signal is less than or equal to the ground power voltage received by the corresponding second diode and greater than the next ground power voltage, and, in the turned-on state, modulate the ground power voltage received by the corresponding second diode to generate a power signal that changes with the input envelope signal and provide it to the linear amplifier; wherein the next ground power voltage is a maximum ground power voltage among the M ground power voltages that is less than the ground power voltage received by the corresponding second diode.

[0029] Possible structure three, when the value of M is an integer greater than or equal to 2, the second subcircuit may include a second diode and M-1 second regulators, the power input end of the second diode is the first power input end of the second subcircuit, the power input ends of the M-1 second regulators correspond to the second power input end to the Mth power input end of the second subcircuit, the first signal input ends of the M-1 second regulators are coupled as the signal input end of the second subcircuit, and the second signal input ends of the M-1 second regulators, the power output ends of the M-1 second regulators and the power output end of the second diode are coupled as the power output end of the second subcircuit. Any second regulator also includes an enable end, which is used to receive an enable signal, and the enable signal is used to control the second regulator to turn on when the voltage corresponding to the input envelope signal is greater than the ground power voltage received by the second regulator and less than the previous ground power voltage; wherein the previous power supply voltage is the maximum ground power voltage among the M ground power voltages that is less than the ground power voltage received by the second regulator. When the second subcircuit is working, the second diode is used to be turned on when the voltage corresponding to the input envelope signal is greater than the first ground power supply voltage, and to be turned off when the voltage corresponding to the input envelope signal is less than or equal to the first ground power supply voltage; any second voltage regulator is used to modulate the ground power supply voltage received by the second voltage regulator in the turned-on state, generate a power supply signal that follows the input envelope signal and provide it to the linear amplifier.

[0030] In the above design, possible structure 1 can select the currently available larger ground power supply voltage from the ground power supply voltage and the ground voltage to generate the power supply voltage of the linear amplifier, possible structure 2 uses a series structure, and possible structure 3 uses a parallel structure, both of which can select the currently available minimum voltage from the ground voltage and at least two ground power supply voltages to generate the power supply voltage of the linear amplifier, and all three structures can reduce the modulation loss of envelope tracking from the ground power supply end. In addition, by configuring a voltage regulator in the above three structures, the power supply signal of the linear amplifier can be modulated into an AC signal that follows the input envelope signal through the voltage regulator, thereby achieving the effect of low distortion and high linearity.

[0031] In a further possible design of the above possible structure three, the second sub-circuit may also include M-1 second enabling circuits corresponding one-to-one to the M-1 second regulators, and for any second enabling circuit: it includes: a third comparator, a fourth comparator and a second AND gate, the positive input terminal of the third comparator is used to receive the previous ground power supply voltage, the negative input terminal of the third comparator is used to receive the input envelope signal, and the output terminal of the third comparator is coupled to an input terminal of the second AND gate; the negative input terminal of the fourth comparator is used to receive the ground power supply voltage received by the corresponding second regulator, the positive input terminal of the fourth comparator is used to receive the input envelope signal, and the output terminal of the fourth comparator is coupled to the other input terminal of the second AND gate; the output terminal of the second AND gate is coupled to the enable terminal of the corresponding second regulator.

[0032] In the above design, comparators and AND gates are relatively common logic devices with simple control logic and low cost. Therefore, by using comparators and AND gates to implement the function of the second enabling circuit, the cost and complexity of the envelope tracking modulator can be reduced.

[0033] In a second aspect, the present application provides a transmitting device, comprising a transmitter, a power amplifier, and an envelope tracking modulator in any one of the designs of the first aspect, wherein the transmitter is coupled to the power amplifier and the envelope tracking modulator respectively. The transmitter is used to output a radio frequency transmission signal to the power amplifier; the envelope tracking modulator is used to generate a power supply signal according to an envelope signal from the transmitter or a baseband processor, and use the power supply signal to power the power amplifier; the power amplifier is used to amplify the power of the radio frequency transmission signal under the drive of the power supply signal.

[0034] In a third aspect, the present application provides a terminal device, comprising a baseband processor and the transmitting device in the above-mentioned second aspect, wherein the baseband processor is used to send a signal to be sent to the transmitting device, and the transmitting device is used to frequency modulate and amplify the signal to be sent and then transmit it.

[0035] Exemplarily, the terminal device may be a mobile terminal device, such as but not limited to: a mobile phone, a laptop computer, a tablet computer, a point of sale (POS) terminal, a car computer, a walkie-talkie, a portable audio device, a smart wearable terminal, etc.

[0036] The beneficial effects of any design in the second to third aspects mentioned above can refer to the beneficial effects that can be achieved by the corresponding design in the first aspect mentioned above, and this application will not repeat them one by one. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1a A schematic diagram of the structure of an envelope tracking modulator is shown as an example;

[0038] Figure 1b A schematic diagram showing the structure of another envelope tracking modulator is shown as an example;

[0039] Figure 2 A schematic diagram showing a possible application scenario to which the present application is applicable;

[0040] Figure 3 The following is a schematic diagram showing the structure of an envelope tracking modulator provided by the present application;

[0041] Figure 4a A schematic diagram showing a structure of a power supply processing circuit provided by the present application is exemplified;

[0042] Figure 4bA schematic diagram showing the structure of another power supply processing circuit provided by the present application is exemplified;

[0043] Figure 4c A schematic diagram showing a structure of another power processing circuit provided by the present application is exemplified;

[0044] Figure 5 A schematic diagram showing a structure of a sub-circuit provided by the present application is exemplified;

[0045] Figure 6 A schematic diagram showing the structure of another sub-circuit provided by the present application is exemplified;

[0046] Figure 7 A schematic diagram showing a structure of another sub-circuit provided in the present application is exemplified;

[0047] Figure 8 A schematic diagram showing the structure of a first enabling circuit provided by the present application is exemplified;

[0048] Fig. 9 A schematic diagram showing a structure of a second enabling circuit provided by the present application is exemplified;

[0049] Fig.10a A schematic diagram showing a structure of another power processing circuit provided by the present application is exemplified;

[0050] Fig.10b A schematic diagram showing a structure of another power processing circuit provided by the present application is exemplified;

[0051] Fig.11a An exemplary voltage waveform diagram provided by the present application is shown;

[0052] Fig.11b An example of a current waveform diagram provided by the present application is shown;

[0053] Fig.12 A schematic diagram showing a possible functional framework of a transmitting device provided by the present application is exemplified;

[0054] Fig.13 A possible functional framework diagram of a terminal device provided by the present application is exemplified. DETAILED DESCRIPTION

[0055] The following is an introduction to possible application scenarios of the present application. It should be noted that these introductions are intended to facilitate understanding by those skilled in the art and do not constitute a limitation on the scope of protection claimed by the present application.

[0056] In a possible application scenario, the envelope tracking modulator in the present application can be integrated into a transmitting device, and the transmitting device can be integrated into a mobile terminal device. The mobile terminal device can also be called a mobile terminal or a mobile communication terminal, which refers to a terminal device that can be used in motion. For example, see Figure 2 , taking mobile phones, laptops and smart helmets as examples. However, it is understandable that the mobile terminal device can also be any movable terminal device, such as but not limited to: mobile phones, laptops, tablet computers, point of sale (POS) terminals, car computers, walkie-talkies, portable audio devices, smart wearable terminals, etc.

[0057] It should be understood that the possible application scenarios given above are only examples, and the envelope tracking modulator provided in the present application can also be applied to other possible scenarios, not limited to the scenarios given in the examples above. For example, it can also be applied to smart medical equipment. For another example, it can also be applied to monitoring equipment. For another example, it can also be applied to smart home equipment. For another example, it can also be applied to navigation equipment. For another example, it can also be applied to car projectors. Or, it can also be applied to other power modulation devices with linear amplifiers. And so on.

[0058] As described in the background technology, the existing envelope tracking modulator uses a class AB linear amplifier to modulate high-frequency energy, which makes it impossible to maintain high efficiency when tracking broadband signals. Although the industry has also proposed some solutions, these solutions either require increasing the switching frequency of the switching amplifier, making it less feasible to track high bandwidths, or require adding capacitors to form an AC architecture. Regardless of which solution is used, the linear amplifier is still a class AB linear amplifier, and the power supply voltage of the class AB linear amplifier cannot change dynamically with the output envelope requirements, which limits the efficiency improvement capability of the envelope tracking modulator.

[0059] In view of this, the present application provides an envelope tracking modulator, which replaces the class AB linear amplifier in the traditional envelope tracking modulator with a class G linear amplifier powered by multiple power supplies, thereby maintaining the high bandwidth tracking capability while making the power supply voltage of the linear amplifier dynamically change with the output envelope requirement, thereby helping to reduce the common current (I sourcing ) loss, absorption current (I sinking ) losses and bias current (I bias ) loss, thereby reducing the power consumption of the linear amplifier and effectively improving the efficiency of the envelope tracking modulator.

[0060] Based on the above content, the following Figure 3 To Attachment Fig.13 , the embodiments of the present application are described in detail.

[0061] like Figure 3, which is a schematic diagram of the structure of an envelope tracking modulator provided by the present application. The envelope tracking modulator 300 includes a converter 310, a power processing circuit 320, a linear amplifier 330 and a switching amplifier 340. The power processing circuit 320 is coupled to the converter 310 and the linear amplifier 330 respectively, and the linear amplifier 330 is also coupled to the switching amplifier 340. For example, the power input terminal of the power processing circuit 320 (including the power supply input terminal b shown in the figure) 1_1 ~b 1_N and ground power input terminal b 2_1 ~b 2_M , where the power supply input terminal b 1_1 ~b 1_N Also known as the current input terminal, ground power input terminal b 2_1 ~b 2_M can also be referred to as a current output terminal) and a port of the converter 310 (including an output terminal a 1_1 ~a 1_N and input terminal a 2_1 ~a 2_M ) coupling, the power output terminal (b 4 ) and the power input terminal (c 3 ) coupling. The output terminal (c 2 ) is coupled to the input of the switching amplifier 340, and the output of the linear amplifier 330 is c 2 It is also coupled to the output end of the switching amplifier 340 as the output end of the envelope tracking modulator 300, and is used to send the output signal V to the power amplifier 400. out , and is also incorporated into the second signal input terminal (c 12 ), as a feedback signal. It can be understood that the linear amplifier 330 may also include a first signal input terminal (c 11 ), used to receive the input envelope signal V in The power processing circuit 320 may further include a signal input terminal (b 3 ), used to receive the input envelope signal V in .

[0062] When the envelope tracking modulator 300 is working, the converter 310 is used to provide a plurality of power supply voltages to the power supply processing circuit 320; the power supply processing circuit 320 is used to generate a plurality of power supply voltages and the envelope signal V input at each time. in The target power supply voltage of the linear amplifier 330 at each moment is determined by the voltage of the multiple power supply voltages corresponding to the input envelope signal V at that moment. inThe linear amplifier 330 is used to bias the input envelope signal V at any moment under the target power supply voltage provided by the power processing circuit 320. in Perform linear amplification to generate a first output signal S 1 and provided to the power amplifier 400, and also provided to the switching amplifier 340; the switching amplifier 340 is used to 1 Amplify the current, for example, the first output signal S 1 The current I la Zoom in to I sa , generating a second output signal S 2 And provided to the power amplifier 400. It can be understood that the second output signal S 2 Also added to the first output signal S 1 In the above example, the output signal V is generated by combining out And feedback to the linear amplifier 330, so that the linear amplifier can output the signal V out Modulated to follow the input envelope signal V in Signal of change.

[0063] In a possible implementation, the power supply voltage may include a power supply voltage, or may also include a ground supply voltage. The target power supply voltage may include a target power supply voltage and a target ground supply voltage. Based on this, the converter 310 provides a plurality of power supply voltages to the linear amplifier 330, which may refer to any of the following three situations:

[0064] In the first case, the converter 310 provides a plurality of power supply voltages to the power processing circuit 320, but does not provide a ground supply voltage. In this case, the power output terminal of the linear amplifier 330 is directly grounded, and the target available ground supply voltage is the ground voltage (0V). In this case, the power processing circuit 320 can select a power supply voltage greater than the input envelope signal V from the plurality of power supply voltages provided by the converter 310 in real time. in A minimum power supply voltage corresponding to the voltage, and after determining the target power supply voltage according to the minimum power supply voltage, it is provided to the linear amplifier 330;

[0065] In the second scenario, the converter 310 provides a power supply voltage and at least one ground supply voltage to the power processing circuit 320. The minimum ground supply voltage among the at least one ground supply voltage is greater than the ground voltage, that is, greater than 0V. In this scenario, the power processing circuit 320 can provide the only power supply voltage as the target power supply voltage to the linear amplifier 330, and can select in real time from the ground voltage and the at least one ground supply voltage provided by the converter 310 a voltage that is less than the input envelope signal V inThe maximum voltage of the corresponding voltage is determined, and the target power supply voltage is provided to the linear amplifier 330 according to the maximum voltage;

[0066] In case 3, the converter 310 provides multiple power supply voltages and at least one ground supply voltage to the power processing circuit 320. The minimum ground supply voltage among the at least one ground supply voltage is greater than the ground voltage, that is, greater than 0V. In this case, the power processing circuit 320 can select a power supply voltage greater than the input envelope signal V from the multiple power supply voltages provided by the converter 310 in real time. in The minimum power supply voltage corresponding to the voltage is determined, and the target power supply voltage is determined according to the minimum power supply voltage and provided to the linear amplifier 330, and a power supply voltage less than the input envelope signal V can be selected in real time from the ground voltage and at least one ground supply voltage provided by the converter 310. in The maximum voltage of the corresponding voltage is determined, and the target power supply voltage is provided to the linear amplifier 330 after being determined according to the maximum voltage.

[0067] In a further possible implementation, the target power supply voltage of the linear amplifier 330 at any time may be a DC voltage or a voltage that follows the input envelope signal V in Changing voltage. For example:

[0068] In the above situation 1 or situation 3, assuming that the minimum power supply voltage among the multiple power supply voltages is the first power supply voltage, then within a certain period of time, if it is greater than the input envelope signal V in The minimum power supply voltage of the corresponding voltage is always maintained at the first power supply voltage, and the power processing circuit 320 can directly use the first power supply voltage as the target power supply voltage of the linear amplifier 330 in the period, that is, the target power supply voltage provided to the linear amplifier 330 in the period is maintained as a DC voltage. Although it is a DC voltage, this voltage is the minimum power supply voltage that can be provided in the envelope tracking modulator 300. Therefore, the power loss of the linear amplifier 330 at the power supply end actually reaches the minimum in the feasible solution. Conversely, in a certain period of time, if it is greater than the input envelope signal V in If the minimum power supply voltage of the corresponding voltage is not the first power supply voltage, the power processing circuit 320 can modulate the minimum power supply voltage to generate a signal V that follows the input envelope. in The changed power supply voltage is used as the target power supply voltage of the linear amplifier 330 during this period. That is, the target power supply voltage provided to the linear amplifier 330 during this period follows the input envelope signal V inThus, when the minimum power supply voltage available in the envelope tracking modulator 300 is insufficient to provide the energy required for modulation of the linear amplifier 330, the power processing circuit 320 modulates the minimum power supply voltage sufficient to provide the energy required for modulation of the linear amplifier 330 to follow the input envelope signal V in The target power supply voltage is such that the linear amplifier 330 can utilize itself to follow the input envelope signal V in The target supply voltage modulation follows the input envelope signal V in The output signal V out , and thus the target power supply voltage used in the modulation process at each moment can be the power supply voltage that minimizes the voltage drop across the linear amplifier 330, thereby effectively saving the power loss of the linear amplifier 330 at the power supply end during the entire modulation process.

[0069] For example, assume that a conventional envelope tracking modulator uses a fixed 10V voltage as the supply voltage of the linear amplifier 330. Therefore, regardless of the input envelope signal V in No matter how large the voltage is, the 10V power supply voltage will be used to modulate the output signal V out However, the envelope tracking modulator 300 in the above scenario 1 or the above scenario 3 can be set to a variety of power supply voltages less than or equal to 10V, such as 2V, 5V, and 10V. in When the voltage of is less than 2V, the power processing circuit 320 provides a 2V DC power supply voltage to the linear amplifier 330, so that the linear amplifier 330 can modulate the output signal V using the minimum 2V power supply voltage that the current envelope tracking modulator 300 can provide. out When the input envelope signal V in When the voltage of is greater than or equal to 2V but less than 5V, the power processing circuit 320 modulates the 5V power supply voltage to follow the input envelope signal V in The changed power supply voltage is then provided to the linear amplifier 330 so that the linear amplifier 330 can follow the input envelope signal V in The supply voltage varies to modulate the input envelope signal V in Variation of the output signal V out , so that the power supply voltage used for modulation at each moment can be as small as possible while meeting the energy required for modulation. in When the voltage of the input envelope signal V is greater than or equal to 5V, the power processing circuit 320 selects the 10V power supply voltage, and modulates the 10V power supply voltage to follow the input envelope signal V inThe changed power supply voltage is then provided to the linear amplifier 330, so that the power supply voltage used for modulation by the linear amplifier 330 at each moment can be as small as possible while meeting the energy required for modulation. In this way, through this design, the envelope tracking modulator 300 can not only have sufficient power supply capacity to generate an envelope signal, but also reduce the modulation voltage drop by reducing the voltage at the power supply end of the linear amplifier 330, thereby reducing the modulation loss at the power supply end and effectively improving the modulation efficiency.

[0070] It should be noted that, in the scenario where the above-mentioned power supply voltage is a DC voltage, considering the device loss in the power processing circuit 320, the target power supply voltage actually provided to the linear amplifier 330 may be slightly smaller than the first power supply voltage, and not completely equal to the first power supply voltage.

[0071] Similarly, in the above situation 2 or situation 3, assuming that the maximum ground power voltage among the multiple ground power voltages is the first ground power voltage, then within a certain period of time, if it is less than the input envelope signal V in The maximum ground power voltage of the corresponding voltage is always maintained at the first ground power voltage, and the power processing circuit 320 can directly use the first ground power voltage as the target ground power voltage of the linear amplifier 330 during the period, that is, the target ground power voltage provided to the linear amplifier 330 during the period is maintained as a DC voltage. Although it is a DC voltage, this voltage is the maximum ground power voltage that can be provided in the envelope tracking modulator 300. Therefore, the power loss of the linear amplifier 330 at the ground power end actually reaches the minimum in the achievable solution. Conversely, within a certain period of time, if it is less than the input envelope signal V in If the maximum ground power voltage of the corresponding voltage is not the first ground power voltage, the power processing circuit 320 can modulate the maximum ground power voltage to generate a signal V that follows the input envelope. in The changed power supply voltage is then used as the target power supply voltage of the linear amplifier 330 during this period. That is, the target power supply voltage provided to the linear amplifier 330 during this period follows the input envelope signal V in Thus, when the maximum ground power supply voltage available in the envelope tracking modulator 300 is insufficient to provide the energy required for modulation of the linear amplifier 330, the maximum ground power supply voltage sufficient to provide the energy required for modulation of the linear amplifier 330 is modulated by the power processing circuit 320 to follow the input envelope signal V in The target ground supply voltage allows the linear amplifier 330 to use its own input envelope signal V in The target ground supply voltage is modulated following the input envelope signal V in The output signal V out, thereby making it possible to ensure that the target power supply voltage used in the modulation process at each moment belongs to the power supply voltage that minimizes the voltage drop across the linear amplifier 330, thereby effectively saving the power supply loss at the power supply end of the linear amplifier 330 during the entire modulation process.

[0072] For example, in a conventional envelope tracking modulator, the ground supply input of the linear amplifier is directly connected to ground. Therefore, no matter the input envelope signal V in No matter how large the voltage is, the 0V ground voltage will be used to modulate the output signal V out However, the envelope tracking modulator in the above scenario 2 or the above scenario 3 can be set to a variety of ground power supply voltages greater than 0V, such as 0.2V, 0.5V. When the input envelope signal V in When the voltage of V is greater than 0.5V, the power processing circuit 320 provides a DC ground voltage of 0.5V to the linear amplifier 330, so that the linear amplifier 330 can modulate the output signal V using the minimum ground voltage of 0.5V that the current envelope tracking modulator 300 can provide. out When the input envelope signal V in When the voltage of the ground power supply is less than or equal to 0.5V but greater than 0.2V, the power processing circuit 320 modulates the 0.2V ground power supply voltage to follow the input envelope signal V in The changed ground power supply voltage is then provided to the linear amplifier 330 so that the linear amplifier 330 can follow the input envelope signal V in The ground supply voltage varies to modulate the input envelope signal V in Variation of the output signal V out , so that the ground power supply voltage used for modulation at each moment can be as small as possible while meeting the energy required for modulation. in When the voltage of the power supply processing circuit 320 is less than or equal to 0.2V, the power supply processing circuit 320 selects the ground voltage of 0V, and modulates the ground voltage of 0V to follow the input envelope signal V in The changed ground power supply voltage is then provided to the linear amplifier 330, so that the ground power supply voltage used by the linear amplifier 330 for modulation at each moment can be as small as possible while meeting the energy required for modulation. In this way, through this design, the envelope tracking modulator 300 can not only have sufficient power supply capacity to generate an envelope signal, but also reduce the modulation voltage drop by reducing the voltage at the ground power supply end of the linear amplifier 330, thereby reducing the modulation loss and effectively improving the modulation efficiency.

[0073] It should be noted that, in the scenario where the ground power supply voltage is a DC voltage, considering the device loss in the power processing circuit 320, the target ground power supply voltage actually provided to the linear amplifier 330 may be slightly larger than the first ground power supply voltage, but not completely equal to the first ground power supply voltage.

[0074] In summary, by setting multiple power supplies in the envelope tracking modulator and dynamically selecting the power supply that minimizes the voltage drop of the linear amplifier current to generate the power supply or ground power supply of the linear amplifier, the linear amplifier can have sufficient power supply capacity to generate the envelope signal and the voltage drop of the linear amplifier at each modulation moment can be minimized, thereby greatly reducing the common current (I sourcing ), absorption current (I sinking ) losses and bias current (I bias ) voltage drop, effectively improving the modulation efficiency of the envelope tracking modulator. In addition, since the power processing circuit selects the same voltage as the input envelope signal V in The voltage dropout is minimized to generate the target power supply voltage of the linear amplifier. Therefore, when the input envelope signal V in After the change, the target power supply voltage of the linear amplifier will also change accordingly. In other words, the target power supply voltage of the linear amplifier can change with the output envelope requirement (i.e. V in ) and dynamically changes, so that the envelope tracking modulator can adapt to the power supply requirements in various envelope tracking scenarios. In addition, the envelope tracking modulator achieves the purpose of reducing power consumption by adjusting the power supply voltage of the linear amplifier without increasing the switching frequency of the switching amplifier, thereby not increasing additional switching losses and maintaining good high-bandwidth tracking feasibility.

[0075] In addition, although some existing schemes also set multiple power supplies in the envelope tracking modulator, these schemes actually select a power supply from the multiple power supplies provided as the power supply of the linear amplifier according to the load power of the output end. In other words, when the load of the output end remains unchanged, the power supply of the linear amplifier always remains a DC power supply. Different from this, in the present application, not only a converter that can provide multiple power supplies (including multiple power supplies and / or at least one ground power supply) is set in the envelope tracking modulator, but also the power supply and / or ground power supply of the linear amplifier are adjusted in real time (or dynamically) according to the voltage change of the input envelope signal, so that it presents a DC power supply or a power supply that follows the change of the input envelope signal. More specifically, only when the available power supply with the smallest voltage difference with the voltage of the input envelope signal is the minimum power supply and / or the maximum ground power supply, the power supply processing circuit will directly provide the minimum power supply and / or the maximum ground power supply to the linear amplifier, so that the linear amplifier is modulated under the DC power supply, and the modulation loss is saved by using the power supply with the smallest voltage drop that can be provided. When the available power source with the smallest voltage difference with the voltage of the input envelope signal is not the minimum power supply and / or the maximum ground power supply, the power processing circuit modulates the available power source with the smallest voltage difference into a power source that follows the changes of the input envelope signal and then provides it to the linear amplifier, so that the linear amplifier is modulated under the power source that follows the changes of the input envelope signal. Under the condition of meeting the modulation energy requirement, the voltage drop of the linear amplifier is reduced as much as possible, thereby saving the modulation loss.

[0076] Below Figure 3 Each functional component and structure involved is introduced and explained separately to provide an exemplary specific implementation scheme.

[0077] 1. Converter

[0078] It can be understood that the converter 310 can be used to provide multiple power supply voltages required by the linear amplifier 330, or to provide at least one power supply voltage and at least one ground supply voltage required by the linear amplifier 330. In other words, the converter 310 can be one of a multi-input converter, a single-input single-output converter, a single-input multi-output converter, a multi-input single-output converter, or a multi-input multi-output converter.

[0079] In one possible implementation, see Figure 3 , the converter 310 may include N output terminals and M input terminals, such as the first output terminal a 1_1 ~Nth output terminal a 1_N and the first input terminal a 2_1 ~Mth input terminal a 2_M, where N is an integer greater than or equal to 2 and M is 0, or N and M are both positive integers. It can be understood that the output end and input end here are both from the perspective of current flow. If the voltage flow is considered, they can also be called N power supply output ends a 1_1 ~a 1_N and M ground power output terminals a 2_1 ~a 2_M When N is an integer greater than or equal to 2, the converter 310 can 1_1 ~Nth output terminal a 1_N Output N power supply voltages with increasing voltages, such as the first power supply voltage VDD 1 ~Nth power supply voltage VDD N , where the Nth power supply voltage VDD N It can be understood as the supply voltage of the class AB linear amplifier in the conventional envelope tracking modulator, such as the aforementioned 10V. When M is an integer greater than or equal to 2, the converter 310 can be connected through the first input terminal a 2_1 ~Mth input terminal a 2_M Provide M ground power supply voltages with decreasing voltages in sequence, such as a first ground power supply voltage VSS 1 ~Mth ground power supply voltage VSS M , where the Mth ground power supply voltage VSS M is greater than the ground voltage of the class AB linear amplifier in the conventional envelope tracking modulator, that is, greater than 0V. When M is 1, the converter 310 can 2_1 Provides a first ground power supply voltage VSS 1 , VSS 1 Greater than the ground voltage, that is, greater than 0V.

[0080] Optionally, see Figure 3 , the converter 310 may also include a power supply terminal a 3 , power supply terminal a 3 Used to receive external supply voltage V BAT , the external supply voltage V BAT Used to power the converter 310 .

[0081] In the present application, the converter 310 can be implemented by a plurality of single-input single-output converters stabilizing a single power supply, or by a single converter with multi-input multi-output function, or by one or more single-input multi-output converters combined with one or more multi-input single-output converters. The converter 310 can generally include a power switch tube, a control circuit, a filter inductor and a filter capacitor, etc. The control circuit controls the power switch to be repeatedly turned on and off, and can convert a DC voltage or current into a high-frequency square wave voltage or current, which can then be rectified and smoothed to form a DC voltage.

[0082] 2. Linear Amplifier

[0083] In a possible implementation, the linear amplifier 330 may be a class AB linear amplifier. The class AB linear amplifier is powered by a single power supply, such as having a single power supply input terminal and a single ground power supply input terminal, and may use the target power supply received from the single power supply input terminal and the target ground power received from the single ground power supply input terminal to modulate the input envelope signal V in Variation of the output signal V out .

[0084] For example, please refer to Figure 3 The linear amplifier 330 may include a first signal input terminal c 11 , the second signal input terminal c 12 , output terminal c 2 and power input terminal c 3 The first signal input terminal c of the linear amplifier 330 11 (Also called positive input terminal) is used to receive the input envelope signal V in The second signal input terminal c of the linear amplifier 330 12 (also called the negative input terminal) and the output terminal c of the linear amplifier 330 2 is coupled to the output terminal of the switching amplifier 340 to receive the output signal V out The output terminal c of the linear amplifier 330 2 The power input terminal c of the linear amplifier 330 is coupled to the input terminal of the switching amplifier 340. 3 The power supply input terminal or the power supply input terminal and the ground power supply input terminal may be included. When only the power supply input terminal is included, the power supply input terminal is coupled to the power processing circuit 320, and the ground power supply input terminal of the linear amplifier 330 is grounded. When both the power supply input terminal and the ground power supply input terminal are included, both the power supply input terminal and the ground power supply input terminal of the linear amplifier 330 are coupled to the power processing circuit 320.

[0085] 3. Power Processing Circuit

[0086] In a possible implementation, the power processing circuit 320 and the linear amplifier 330 can form a multi-power class G linear amplifier, or can also be called a power-adaptive class G linear amplifier. Figure 3 The power processing circuit 320 may include N power supply input terminals and M ground power supply input terminals, such as the first power supply input terminal b 1_1 ~Nth power supply input terminal b 1_N and the first ground power input terminal b 2_1 ~Mth power input terminal b 2_MAmong them, the first power supply input terminal b 1_1 ~Nth power supply input terminal b 1_N and the first output terminal a of the converter 310 1_1 ~Nth output terminal a 1_N One-to-one coupling, used to receive the first power supply voltage VDD output by the converter 310 with the voltage increasing in sequence 1 ~Nth power supply voltage VDD N . The first ground power input terminal b 2_1 ~Mth power input terminal b 2_M and the first input terminal a of the converter 310 2_1 ~Mth input terminal a 2_M One-to-one coupling, used to receive the first ground power supply voltage VSS provided by the converter 310 with a voltage decreasing in sequence 1 ~Mth ground power supply voltage VSS M The power processing circuit 320 may further include a signal input terminal b 3 and power output terminal b 4 , signal input terminal b 3 Used to receive the input envelope signal V in , power output terminal b 4 The power input terminal c of the coupled linear amplifier 330 3 The power output terminal b of the power processing circuit 320 is 4 It may include a power supply output terminal or a power supply output terminal and a ground power supply output terminal. When only the power supply output terminal is included, the power supply output terminal is coupled to the power supply input terminal of the linear amplifier 330, and the ground power supply input terminal of the linear amplifier 330 is grounded. When both the power supply output terminal and the ground power supply output terminal are included, the power supply output terminal is coupled to the power supply input terminal of the linear amplifier 330, and the ground power supply output terminal is coupled to the ground power supply input terminal of the linear amplifier 330.

[0087] In the present application, the power processing circuit 320 can implement at least one of the following two functions: Function 1: from the first power supply voltage VDD 1 ~Nth power supply voltage VDD N Select a signal greater than the input envelope signal V in The minimum power supply voltage corresponding to the voltage, and the target power supply voltage of the linear amplifier 330 is determined according to the minimum power supply voltage; Function 2, from the first power supply voltage VSS 1 ~Mth ground power supply voltage VSS M and ground voltage (assuming it is called VSS G ) is selected to be smaller than the input envelope signal V in The maximum voltage of the corresponding voltage is determined, and the target ground power supply voltage of the linear amplifier 330 is determined according to the maximum voltage.

[0088] To achieve the above function 1, in a possible implementation, please refer to Figure 4a , exemplarily showing a schematic diagram of a power processing circuit provided by the present application. In this example, N is an integer greater than or equal to 2, M is 0, and the converter 310 can be a multi-output converter. Figure 4a As shown, the power processing circuit 320 may include a first sub-circuit 321. The first power input terminal f of the first sub-circuit 321 is 2_1 ~Nth power input terminal f 2_N The first power supply input terminal b of the power processing circuit 320 corresponds to 1_1 ~Nth power supply input terminal b 1_N , for receiving the first power supply voltage VDD whose voltage increases successively from the converter 310 1 ~Nth power supply voltage VDD N ; The signal input terminal f of the first sub-circuit 321 1 Corresponding to the signal input terminal b of the power processing circuit 320 3 , used to receive the input envelope signal V in The power output terminal f of the first sub-circuit 321 3 The corresponding power supply output terminal b of the power processing circuit 320 41 , the power supply output terminal b 41 The power supply input terminal c of the linear amplifier 330 31 The ground power input terminal c of the linear amplifier 330 is coupled to provide a power supply signal to the linear amplifier 330; 32 Ground, used to receive the ground voltage VSS G .

[0089] use Figure 4a The power processing circuit 320 shown in FIG. 1 can receive the first power supply voltage VDD from the converter 310 when the envelope tracking modulator 300 is working. 1 ~Nth power supply voltage VDD N , and can be based on the input envelope signal V in The voltage is selected to be greater than the input envelope signal V in The minimum power supply voltage corresponding to the voltage, when the minimum power supply voltage is the first power supply voltage VDD 1 When the first power supply voltage VDD 1 Provided to the linear amplifier 330, when the minimum power supply voltage is not the first power supply voltage VDD 1 When the minimum power supply voltage is modulated to follow the input envelope signal V inThe changed power supply voltage is then provided to the linear amplifier 330. Through this structural design, the first sub-circuit can adaptively select multiple power supply voltages, for example, it can select the power supply voltage with the lowest power consumption from the power supply terminal, and can select to modulate or not modulate the power supply voltage with the lowest power consumption according to the relationship between the power supply voltage with the lowest power consumption and the first power supply voltage, so that the class AB amplifier can use the target power supply voltage and the ground voltage that minimize the voltage drop to modulate the envelope output signal V out , effectively reducing the energy loss at the power supply end during the modulation process.

[0090] Similarly, to achieve the above function 2, in a possible implementation, please refer to Figure 4b , exemplarily shows a structural diagram of another power processing circuit provided by the present application. In this example, N is 1, M is a positive integer, and the converter 310 can be a single-output single-input converter or a single-output multi-input converter. Figure 4b As shown, the power processing circuit 320 may include a second sub-circuit 322. The signal input terminal g of the second sub-circuit 322 1 As the signal input terminal b of the power processing circuit 320 3 , used to receive the input envelope signal V in The power output terminal g of the second sub-circuit 322 3 The ground power output terminal b of the power processing circuit 320 42 , and the ground power input terminal c of the linear amplifier 330 32 coupling, used to provide a target ground power supply voltage to the linear amplifier 330; the power supply input terminal c of the linear amplifier 330 31 The power supply output terminal a of the converter 310 1 The first power input terminal g of the second sub-circuit 322 is coupled to receive the fixed power supply voltage VDD from the converter 310; 2_1 ~Mth power input terminal g 2_M The first ground power input terminal b of the power processing circuit 320 corresponds to 2_1 ~Mth power input terminal b 2_M , for receiving the first ground power supply voltage VSS provided by the converter 310 with a voltage value decreasing in sequence 1 ~Mth ground power supply voltage VSS M .

[0091] use Figure 4b The power processing circuit 320 shown in FIG. 1 can receive the ground voltage VSS when the envelope tracking modulator 300 is working. G and the first ground power supply voltage VSS from the converter 310 1 ~Mth ground power supply voltage VSSM , and can be based on the input envelope signal V in The voltage is selected from M+1 voltages and is smaller than the input envelope signal V in The maximum voltage of the corresponding voltage, when the maximum voltage is the first ground power supply voltage VSS 1 When the first ground power supply voltage VSS 1 Provided to the linear amplifier 330, when the maximum voltage is not the first ground power supply voltage VSS 1 When the maximum voltage is modulated to follow the input envelope signal V in The changed ground voltage is then provided to the linear amplifier 330. Through this structural design, the second sub-circuit can adaptively select multiple ground voltages, for example, it can select the ground voltage with the smallest power consumption from the ground power supply terminal, and can select to modulate or not modulate the ground voltage with the smallest power consumption according to the relationship between the ground voltage with the smallest power consumption and the first ground power supply voltage, so that the class AB amplifier can use the target ground power supply voltage with the smallest voltage drop and the fixed power supply voltage VDD to modulate the envelope output signal V out , effectively reducing the energy loss at the ground power supply end during the modulation process.

[0092] Similarly, to implement the above functions 1 and 2, in a possible implementation, please refer to Figure 4c , exemplarily showing a structural diagram of another power processing circuit provided by the present application. In this example, N is a positive integer greater than or equal to 2, M is a positive integer, and the converter 310 can be a multi-output single-input converter or a multi-output multi-input converter. Figure 4c As shown, the power processing circuit 320 may include a first sub-circuit 321 and a second sub-circuit 322, wherein the port coupling relationship of the first sub-circuit 321 can be referred to in the above Figure 4a The port coupling relationship of the second sub-circuit 322 can be seen from the above Figure 4b , I will not repeat it here. Figure 4c In the power processing circuit 320 shown in FIG. 1 , the first sub-circuit 321 can receive the first power supply voltage VDD from the converter 310. 1 ~Nth power supply voltage VDD N , and can be based on the input envelope signal V in The voltage is selected to be greater than the input envelope signal V in The minimum power supply voltage corresponding to the voltage can be further determined based on the minimum power supply voltage and the first power supply voltage VDD. 1 The first power supply voltage VDD is selected 1 Or modulated to follow the input envelope signal V in The varying supply voltage is provided to the linear amplifier 330. The second sub-circuit 322 may receive a ground voltage VSS.G and the first ground power supply voltage VSS from the converter 310 1 ~Mth ground power supply voltage VSS M , and can be based on the input envelope signal V in The voltage is selected from M+1 voltages and is smaller than the input envelope signal V in The maximum voltage of the corresponding voltage can be further calculated based on the maximum voltage and the first ground power supply voltage VSS. 1 The size relationship is selected to set the first ground power supply voltage VSS 1 Or modulated to follow the input envelope signal V in The changed ground voltage is provided to the linear amplifier 330. In this way, the linear amplifier 330 can use the power supply voltage provided by the first sub-circuit 321 and the ground voltage provided by the second sub-circuit 322 to modulate and obtain a signal that follows the input envelope signal V in Variation of the output signal V out Through this structural design, the power processing circuit can select the power supply voltage with the smallest power consumption from the power supply end and select the ground power with the smallest power consumption from the ground power supply end to provide to the linear amplifier, thereby reducing the modulation loss of the linear amplifier from both the power supply end and the ground power supply end, and effectively improving the modulation efficiency.

[0093] The following is Figure 4c Taking the structure of the power processing circuit 320 as an example, possible structures of the first sub-circuit 321 or the second sub-circuit 322 are further introduced.

[0094] Sub-circuit structure 1

[0095] See also Figure 5 , exemplarily showing a schematic diagram of a sub-circuit provided in the present application. In this example, it is assumed that the value of N is 2 and the value of M is 1. In other words, the converter 310 may include a first output terminal a 11 , the second output terminal a 12 and input terminal a 2 The first sub-circuit 321 may include a first power input terminal f 21 , the second power input terminal f 22 、Signal input terminal f 1 and power output terminal f 3 The second sub-circuit 322 may include a power input terminal g 2 , signal input terminal g 1 and power output terminal g 3 The first power input terminal f of the first sub-circuit 321 is 21 The first output terminal a of the coupling converter 310 11 , used to receive the first power supply voltage VDD 1The second power input terminal f of the first sub-circuit 321 22 The second output terminal a of the coupling converter 310 12 , used to receive the second power supply voltage VDD 2 , the second power supply voltage VDD 2 Greater than the first power supply voltage VDD 1 The power input terminal g of the second sub-circuit 322 2 The input terminal a of the coupling converter 310 2 , for receiving the ground power supply voltage VSS provided by the converter 310 1 , ground power supply voltage VSS 1 Greater than ground voltage VSS G , that is, greater than 0. In addition, the coupling relationship between the other ports of the first sub-circuit 321 and the other ports of the second sub-circuit 322 is consistent with the above content, and will not be repeated here.

[0096] In one possible implementation, see Figure 5 The first sub-circuit 321 may include a first regulator 3211 and a first diode D1. The power input terminal h of the first regulator 3211 1 is the second power input terminal f of the first sub-circuit 321 22 , for receiving the second output terminal a of the converter 310 12 The second power supply voltage VDD provided 2 The power input terminal of the first diode D1 is the first power input terminal f of the first sub-circuit 321 21 , for receiving the first output terminal a of the converter 310 11 Provides a first power supply voltage VDD 1 ; The first signal input terminal h of the first regulator 3211 21 is the signal input terminal f of the first sub-circuit 321 1 , used to receive the input envelope signal V in ; The second signal input terminal h of the first regulator 3211 22 , the power output terminal h of the first voltage regulator 3211 3 After being coupled to the power output terminal of the first diode D1, the power output terminal f of the first sub-circuit 321 is used as the power output terminal f 3 , used to send the supply voltage VDD to the linear amplifier 330 AB .

[0097] It is understandable that the first regulator 3211 may be a low dropout regulator (LDO). 21 The received input envelope signal V inThe voltage is less than or equal to (considering that the first voltage regulator 3211 has a start voltage) the first power supply voltage VDD 1 , the first regulator 3211 is turned off, so that the power input terminal h of the first regulator 3211 1 The received second power supply voltage VDD 2 cannot be provided to the linear amplifier 330. On the contrary, when the first signal input terminal h of the first regulator 3211 is 21 The received input envelope signal V in The voltage is greater than the first power supply voltage VDD 1 When the voltage of the first voltage regulator 3211 is turned on, the first voltage regulator 3211 can 1 The received second power supply voltage VDD 2 Modulated to follow the input envelope signal V in Changing voltage signal VDD AB Then, it is provided to the linear amplifier 330.

[0098] It can be understood that the first diode D1 can be a power diode. When the power input terminal of the first diode D1 receives the first power supply voltage VDD 1 The voltage is less than or equal to (considering the conduction voltage of the first diode D1) the output signal VDD of the first diode D1 AB When the first diode D1 is reverse biased, the first power supply voltage VDD 1 The first power supply voltage VDD cannot be provided to the linear amplifier 330 through the reverse biased first diode D1. On the contrary, when the power supply input terminal of the first diode D1 receives the first power supply voltage VDD 1 The voltage is greater than the output signal VDD of the first diode D1 AB When the first diode D1 is turned on, the first power supply voltage VDD 1 The power may be provided to the linear amplifier 330 through the turned-on first diode D1.

[0099] In summary, in the first sub-circuit 321, the first voltage regulator 3211 can be powered by the second power supply voltage VDD which is relatively high. 2 The first diode D1 can extract current from the first power supply voltage VDD with a relatively low voltage to power the linear amplifier 330. 1 The first sub-circuit 321 extracts current from the power supply voltage to power the linear amplifier 330, which depends on the input envelope signal V in The voltage of the linear amplifier 330 and the relative voltage magnitude of the two power supply voltages. out is following the input envelope signal Vin The change, therefore, can also be considered to depend on the output signal V of the linear amplifier 330 out The voltage of the two power supply voltages and the relative voltage size. For example, with the input envelope signal V in For example, when the input envelope signal V in The voltage is less than the first power supply voltage VDD 1 When the voltage of the first voltage regulator 3211 is turned off, the first diode D1 is turned on, and the first power supply voltage VDD 1 The voltage can flow out to the linear amplifier 330 through the turned-on first diode D1 to power the linear amplifier 330. On the contrary, when the input envelope signal V in The voltage is greater than or equal to the first power supply voltage VDD 1 but less than the second power supply voltage VDD 2 When the voltage of the first voltage regulator 3211 is turned on, the second power supply voltage VDD 2 The first voltage regulator 3211 can be modulated to follow the input envelope signal V in Variation of output signal VDD AB After that, it flows out to the linear amplifier 330 to power the linear amplifier 330. At this time, the first diode D1 is reverse biased and no current flows therethrough.

[0100] By adopting the structure of the first sub-circuit, by providing the first voltage regulator and the first diode, the power supply voltage with the lowest power consumption can be selected from the power supply voltages with power supply modulation capability to supply power to the linear amplifier, which helps to reduce the modulation loss at the power supply end. In addition, by modulating the power supply of the linear amplifier into AC power that follows the output voltage through the voltage regulator, signal distortion can be reduced and signal linearity can be improved.

[0101] Similar to the first sub-circuit 321, in a possible implementation, please continue to refer to Figure 5 The second sub-circuit 322 may include a second regulator 3221 and a second diode D2. The power output terminal j of the second regulator 3221 3 , the power supply output terminal of the second diode D2 and the second signal input terminal j of the second regulator 3221 22 After coupling, the power output terminal g of the second sub-circuit 322 is used as 3 , used to provide a ground voltage VSS to the linear amplifier 330 AB ; The first signal input terminal j of the second regulator 3221 21 As the signal input terminal g of the second sub-circuit 322 1 , used to receive the input envelope signal V in ; The power input terminal j of the second regulator 32211 Ground, used to receive the ground voltage VSS G The power input terminal of the second diode D2 is used as the power input terminal of the second sub-circuit 322. 2 , for receiving the ground power supply voltage VSS provided by the converter 310 1 .

[0102] It can be understood that the second regulator 3221 can be an LDO. 21 The received input envelope signal V in The voltage is greater than the ground power supply voltage VSS 1 When the second regulator 3221 is turned off, the ground voltage VSS G The first signal input terminal j of the second regulator 3221 is not provided to the linear amplifier 330. 21 The received input envelope signal V in The voltage is less than or equal to the ground power supply voltage VSS 1 The voltage is greater than the ground voltage VSS G When the second voltage regulator 3221 is turned on, the second voltage regulator 3221 can G Modulated to follow the input envelope signal V in Changing ground voltage VSS AB Then, it is provided to the linear amplifier 330.

[0103] It can be understood that the second diode D2 can be a power diode. AB Less than or equal to (considering the conduction voltage of the first diode D1) the ground power supply voltage VSS of the power supply input terminal of the second diode D2 1 When the first diode D1 is reverse biased, the power supply voltage VSS is 1 The reverse biased second diode D2 cannot be provided to the linear amplifier 330. On the contrary, when the ground voltage VSS at the power supply output end of the second diode D2 AB is greater than the ground power supply voltage VSS at the power supply input terminal of the second diode D2 1 When the second diode D2 is turned on, the power supply voltage VSS is 1 The power can be provided to the linear amplifier 330 through the turned-on second diode D2.

[0104] In summary, in the second sub-circuit 322, the second regulator 3221 can AB Coupled to the relatively low ground voltage VSS GThe second diode D2 can connect the ground voltage VSS of the linear amplifier 330 to the AB Coupled to the relatively high ground supply voltage VSS 1 The second sub-circuit 322 specifically converts the ground voltage VSS of the linear amplifier 330 AB Coupled to ground voltage VSS G The power supply voltage VSS is still ground 1 terminal, depends on the input envelope signal V in voltage and ground voltage VSS G , ground power supply voltage VSS 1 It can be understood that since the output signal V of the linear amplifier 330 out is following the input envelope signal V in The change, therefore, can also be considered to depend on the output signal V of the linear amplifier 330 out voltage and ground voltage VSS G , ground power supply voltage VSS 1 The relative voltage size. Take the input envelope signal V in For example, when the input envelope signal V in The voltage is greater than the ground power supply voltage VSS 1 When the second regulator 3221 is turned off, the second diode D2 is turned on, and the ground power supply voltage VSS 1 The second diode D2 can be turned on to provide the linear amplifier 330. On the contrary, when the input envelope signal V in The voltage is less than or equal to the ground power supply voltage VSS 1 But greater than the ground voltage VSS G When the second regulator 3221 is turned on, the ground voltage VSS G The second regulator 3221 can be turned on to modulate the input envelope signal V in Changing ground voltage VSS AB After that, it is provided to the linear amplifier 330. At this time, the second diode D2 is reverse biased and no current flows therethrough.

[0105] By adopting the structure of the second sub-circuit 322, by setting a second regulator and a second diode, the voltage with the lowest power consumption can be selected from the ground voltage or the ground power voltage with ground power capability as the ground voltage of the linear amplifier, which helps to reduce the modulation loss at the ground power end.

[0106] Sub-circuit structure 2

[0107] See also Figure 6, exemplarily showing a structural diagram of another sub-circuit provided in an embodiment of the present application. In this example, it is assumed that N is an integer greater than or equal to 3, and M is an integer greater than or equal to 2. In other words, the converter 310 may include a first output terminal a 1_1 , the second output terminal a 1_2 , ..., N-1th output terminal a 1_N-1 , Nth output terminal a 1_N , the first input terminal a 2_1 , the second input terminal a 2_2 , ..., Mth input terminal a 2_M The first sub-circuit 321 may include a first power input terminal f 2_1 , the second power input terminal f 2_2 , ..., N-1th power input terminal f 2_N-1 、Nth power input terminal f 2_N 、Signal input terminal f 1 and power output terminal f 3 The second sub-circuit 322 may include a first power input terminal g 2_1 , the second power input terminal g 2_2 , ..., Mth power input terminal g 2_M , power output terminal g 3 and signal input terminal g 1 The first power input terminal f of the first sub-circuit 321 is 2_1 The first output terminal a of the coupling converter 310 1_1 , used to receive the first power supply voltage VDD 1 The second power input terminal f of the first sub-circuit 321 2_2 The second output terminal a of the coupling converter 310 1_2 , used to receive the second power supply voltage VDD 2 ; ...; The N-1th power input terminal f of the first sub-circuit 321 2_N-1 The N-1th output terminal a of the coupling converter 310 1_N-1 , used to receive the N-1th power supply voltage VDD N-1 The Nth power input terminal f of the first sub-circuit 321 2_N The Nth output terminal a of the coupling converter 310 1_N , used to receive the Nth power supply voltage VDD N Wherein, the first power supply voltage VDD 1 , the second power supply voltage VDD 2 , ..., N-1th power supply voltage VDD N-1 , Nth power supply voltage VDD N The voltage value of the first power input terminal g of the second sub-circuit 322 increases successively. 2_1The first input terminal a of the coupling converter 310 2_1 , for receiving the first ground power supply voltage VSS provided by the converter 310 1 The second power input terminal g of the second sub-circuit 322 2_2 The second input terminal a of the coupling converter 310 2_2 , for receiving the second ground power supply voltage VSS provided by the converter 310 2 ; ...; The Mth power input terminal g of the second sub-circuit 322 2_M The Mth input terminal a of the coupling converter 310 2_M , for receiving the Mth ground power supply voltage VSS provided by the converter 310 M Among them, the first ground power supply voltage VSS 1 , the second ground power supply voltage VSS 2 , ..., Mth ground power supply voltage VSS M The voltage decreases successively, and the Mth power supply voltage VSS M The voltage is greater than the ground voltage VSS G , that is, greater than 0. In addition, the coupling relationship between the other ports of the first sub-circuit 321 and the other ports of the second sub-circuit 322 is consistent with the aforementioned content, and will not be repeated here.

[0108] In one possible implementation, see Figure 6 The first sub-circuit 321 may include N-1 first regulators 321_1 to 321_N-1 and N-1 first diodes D1 corresponding to the N-1 first regulators 321_1 to 321_N-1. 1 ~D1 N-1 Among them, N-1 first voltage regulators 321_1 to 321_N-1 are connected in series in sequence, and the power input terminal h of the previous first voltage regulator 321_i (i is a positive integer greater than or equal to 1 and less than or equal to N-2) 1_i The power output terminal h of the first voltage regulator 321_i+1 is coupled to 3_i+1 , used to receive the voltage signal VDD provided by the next first regulator 321_i+1 AB_i+1 The power output terminal h of the first voltage regulator 321_1 located at the head end of the series connection among the N-1 first voltage regulators 321_1 to 321_N-1 is 3_1 The power output terminal f of the first sub-circuit 321 3 , used to provide a voltage signal VDD to the linear amplifier 330 AB_1 The power input terminal h of the first voltage regulator 321_N-1 located at the end of the series connection among the N-1 first voltage regulators 321_1 to 321_N-1 is 1_N-1 is the Nth power input terminal f of the first sub-circuit 321 2_N, used to receive the Nth power supply voltage VDD N The first signal input terminals h of the N-1 first regulators 321_1 to 321_N-1 are 21_1 ~h 21_N-1 After coupling, it serves as the signal input terminal f of the first sub-circuit 321 1 , used to receive the input envelope signal V in . N-1 first diodes D1 1 ~D1 N-1 The power input terminal of the first sub-circuit 321 corresponds to the first power input terminal f 2_1 ~N-1th power input terminal f 2_N-1 , used to receive the first power supply voltage VDD 1 ~N-1th power supply voltage VDD N-1 After the power output end of any first diode is coupled with the power output end of the corresponding first regulator, it is connected to the second signal input end of the corresponding first regulator, such as the first diode D1 1 The power output terminal of the first regulator 321_1 is connected to the power output terminal of the first regulator 321_1. 3_1 After coupling, the second signal input terminal h of the first regulator 321_1 is connected. 22_1 , the first diode D1 2 The power output terminal of the first voltage regulator 321_2 is connected to the power output terminal of the first voltage regulator 321_2. 3_2 After coupling, the second signal input terminal h of the first regulator 321_2 is connected. 22_2 , ..., the first diode D1 N-1 The power output terminal of the first regulator 321_N-1 is connected to the power output terminal of the first regulator 321_N-1. 3_N-1 After coupling, the second signal input terminal h of the first regulator 321_N-1 is connected. 22_N-1 .

[0109] use Figure 6 The circuit structure of the first sub-circuit 321 is shown as follows:

[0110] When the input envelope signal V in The voltage is less than the first power supply voltage VDD 1 When the first voltage regulators 321_1 to 321_N-1 are all turned off, the first diode D1 1 The first power supply voltage VDD 1 The first diode D1 can be turned on 1 Flows out to the linear amplifier 330 to power the linear amplifier 330. At this time, the power supply voltage VDD output by the first sub-circuit 321 AB_1 =VDD 1 -V f11 Among them, V f11The first diode D1 1 The turn-on voltage.

[0111] When the input envelope signal V in The voltage increases to be greater than or equal to the first power supply voltage VDD 1 and is less than the second power supply VDD 2 When the first regulator 321_1 and the first diode D1 2 The first voltage regulator 321_2 to the first voltage regulator 321_N-1 are still turned off, and the second power supply voltage VDD 2 The first diode D1 can be turned on 2 and the first regulator 321_1 to the linear amplifier 330, providing power for the linear amplifier 330. At this time, the first diode D1 1 The second power supply voltage VDD 2 Through the first diode D1 2 Then it becomes the supply voltage VDD AB_2 The first voltage regulator 321_1 transmits the power signal VDD to the first voltage regulator 321_1. AB_2 Modulated to follow the input envelope signal V in Changing power supply signal VDD AB_1 After that, the linear amplifier 330 is powered. Among them, VDD AB_2 =VDD 2 -V f12 , V f12 The first diode D1 2 The turn-on voltage.

[0112] Similarly, when the input envelope signal V in The voltage continues to increase to be greater than or equal to the N-1th power supply voltage VDD N-1 The voltage is less than the Nth power supply VDD N When the voltage of the first voltage regulator 321_1 to the first voltage regulator 321_N-1 are all turned on, the Nth power supply voltage VDD N The first regulator 321_1 to the first regulator 321_N-1 can be modulated to follow the input envelope signal V in Changing power supply signal VDD AB_1 , and flows out to the linear amplifier 330 to power the linear amplifier 330. At this time, the first diode D1 1 ~First diode D1 N-1 All are cut off and the current on them is zero.

[0113] Similar to the structure of the first sub-circuit 321, in a possible implementation, please continue to refer to Figure 6The second sub-circuit 322 may include M second regulators 322_1 to 322_M and M second diodes D2 corresponding to the M second regulators 322_1 to 322_M. 1 ~D2 M Among them, the M second voltage regulators 322_1 to 322_M are connected in series in sequence, and the power input terminal j of the previous second voltage regulator 322_k (k is a positive integer greater than or equal to 1 and less than or equal to M-1) 1_k The power output terminal j of the second voltage regulator 322_k+1 is coupled to 3_k+1 , used to receive the ground power supply voltage VSS provided by the second regulator 322_k+1 AB_K+1 The power output terminal j of the second voltage regulator 322_1 located at the head end of the series connection among the M second voltage regulators 322_1 to 322_M is 3_1 The power output terminal g of the second sub-circuit 322 3 , used to provide ground voltage VSS to the class AB amplifier 320 AB_1 The power input terminal j of the second voltage regulator 322_M located at the end of the series connection among the M second voltage regulators 322_1 to 322_M is 1_M Ground, used to receive the ground voltage VSS G The first signal input terminals j of the M second regulators 322_1 to 323_M are 21_1 ~j 21_M After coupling, it serves as the signal input terminal g of the second sub-circuit 322 1 , used to receive the input envelope signal V in . M second diodes D2 1 ~D2 M The power input terminal of the second sub-circuit 322 corresponds to the first power input terminal g 2_1 ~Mth power input terminal g 2_M , for receiving the first ground power supply voltage VSS 1 ~Mth ground power supply voltage VSS M The power output end of any second diode is coupled with the power output end of the corresponding second regulator and then connected to the second signal input end of the corresponding second regulator, such as the second diode D2 1 The power output terminal of the second regulator 322_1 is connected to the power output terminal j 3_1 After coupling, the second signal input terminal j of the second regulator 322_1 is connected 22_1 , the second diode D2 2 The power output terminal of the second regulator 322_2 is connected to the power output terminal j 3_2 After coupling, the second signal input terminal j of the second regulator 322_2 is connected. 22_2 , ..., the second diode D2 MThe power output terminal of the second regulator 322_M is connected to the power output terminal j 3_M After coupling, the second signal input terminal j of the second regulator 322_M is connected. 22_M .

[0114] use Figure 6 The circuit structure of the second sub-circuit 322 is shown as follows:

[0115] When the input envelope signal V in The voltage is greater than the first ground power supply voltage VSS 1 When the second voltage regulators 322_1 to 322_M are all turned off, the second diode D2 1 The first input terminal a of the converter 310 is turned on. 2_1 Provides a first ground power supply voltage VSS 1 The second diode D2 can be turned on 1 is provided to the linear amplifier 330. At this time, the ground voltage VSS of the linear amplifier 330 AB_1 For: VSS 1 +V f21 Among them, V f21 The second diode D2 1 The turn-on voltage.

[0116] When the input envelope signal V in The voltage of the first ground power supply voltage VSS is reduced to less than or equal to the first ground power supply voltage VSS 1 and is greater than the second ground power supply voltage VSS 2 When the second regulator 322_1 and the second diode D2 2 Turn on, the second diode D2 3 ~The second diode D2 M The second voltage regulators 322_2 to 322_M are turned off, and the second input terminal a of the converter 310 is turned off. 2_2 Provides ground supply voltage VSS 2 The second diode D2 can be turned on 2 The second regulator 322_1 is modulated to follow the input envelope signal V in Changing ground voltage VSS AB_1 After that, it is provided to the linear amplifier 330. At this time, the second diode D2_ 1 The second voltage regulator 322_1 receives the ground voltage VSS. AB_2 For: VSS 2 +V f22 , V f22 The first diode D2 2 The turn-on voltage.

[0117] Similarly, when the input envelope signal Vin The voltage of the Mth ground power supply voltage VSS continues to decrease to less than or equal to the Mth ground power supply voltage VSS M and is greater than the ground voltage VSS G When the second regulators 322_1 to 322_M are all turned on, the ground voltage VSS G The second regulators 322_1 to 322_M can be turned on to modulate the voltage to follow the input envelope signal V in Changing ground voltage VSS AB_1 After that, it is provided to the linear amplifier 330. At this time, the second diode D2 1 ~The second diode D2 M They are all reverse biased, and the current on them is zero.

[0118] By adopting the above-mentioned sub-circuit structure 2, the power supply voltage can be divided into N gears, and the ground voltage can be divided into M+1 gears. By setting N-1 first voltage regulators and N-1 first diodes in a series structure, the power supply voltage with the minimum power consumption and power supply capability can be selected from the N gears to power the class AB amplifier. By setting M second voltage regulators and M second diodes in a series structure, the ground voltage with the minimum power consumption and power supply capability can be selected from the M+1 gears to power the class AB amplifier. This power supply selection method is more detailed and can more flexibly adapt to various power supply scenarios, effectively reducing the modulation loss at the power supply end and the ground power supply end.

[0119] Sub-circuit structure three

[0120] See also Figure 7 , exemplarily shows a structural diagram of another sub-circuit provided in an embodiment of the present application. In this example, N is an integer greater than or equal to 3, and M is an integer greater than or equal to 2. Among them, the port coupling relationship of the converter 310, the first sub-circuit 321 and the second sub-circuit 322 is the same as that in the sub-circuit structure 2, and will not be repeated here.

[0121] In one possible implementation, see Figure 7 The first sub-circuit 321 may include N-1 first regulators 321_1 to 321_N-1 and a first diode D1. The power input terminal of the first diode D1 is the first power input terminal f of the first sub-circuit 321. 2_1 , used to receive the first power supply voltage VDD 1 The power input terminals of the N-1 first voltage regulators 321_1 to 321_N-1 correspond one-to-one to the second power input terminal f of the first sub-circuit 321. 2_2 ~Nth power input terminal f 2_N For example, the power input terminal h of the first regulator 321_1 1_1 is the second power input terminal f of the first sub-circuit 3212_2 , used to receive the second power supply voltage VDD 2 , the power input terminal h of the first regulator 321_2 1_2 is the third power input terminal f of the first sub-circuit 321 2_3 , used to receive the third power supply voltage VDD 3 , ..., the power input terminal h of the first regulator 321_N-1 1_N-1 is the Nth power input terminal f of the first sub-circuit 321 2N , used to receive the Nth power supply voltage VDD N The first signal input terminals h of the N-1 first regulators 321_1 to 321_N-1 are 21_1 ~h 21_N-1 After coupling, it serves as the signal input terminal f of the first sub-circuit 321 1 , used to receive the input envelope signal V in The power output terminals h of the N-1 first voltage regulators 321_1 to 321_N-1 3_1 ~h 3_N-1 and the power supply output terminal of the first diode D1 and the second signal input terminals h of the N-1 first regulators 321_1 to 321_N-1. 22_1 ~h 22_N-1 After coupling, the power output terminal f of the first sub-circuit 321 is used 3 , used to output voltage signal VDD AB .

[0122] Furthermore, in the first sub-circuit 321, any first regulator may further include an enable terminal, the enable terminal being used to receive a corresponding enable signal, the enable signal being used to enable the input envelope signal V in When the voltage is less than the power supply voltage corresponding to the first voltage regulator and greater than the previous power supply voltage, the current first voltage regulator is controlled to be turned on. The previous power supply voltage is the minimum power supply voltage among the N power supply voltages whose voltage is less than the power supply voltage corresponding to the first voltage regulator. For example, please continue to refer to Figure 7 , the enable terminal h of the first regulator 321_1 4_1 Used to receive the enable signal E 1_1 , enable signal E 1_1 For the input envelope signal V in The voltage is less than the second power supply voltage VDD 2 and is greater than the first power supply voltage VDD 1 When the first voltage regulator 321_1 is turned on, the enable terminal h of the first voltage regulator 321_2 is turned on. 4_2 Used to receive the enable signal E 1_2 , enable signal E 1_2 For the input envelope signal Vin The voltage is less than the third power supply voltage VDD 3 and is greater than the second power supply voltage VDD 2 When the first voltage regulator 321_2 is turned on, the enable terminal h of the first voltage regulator 321_N-1 is turned on. 4_N-1 Used to receive the enable signal E 1_N-1 , enable signal E 1_N-1 For the input envelope signal V in The voltage is less than the Nth power supply voltage VDD N And greater than the N-1th power supply voltage VDD N-1 When the first regulator 321_N-1 is controlled to be turned on.

[0123] It can be understood that the enable signal can realize the enable function by driving at a high level and a low level. For example, in one example, when the enable signal is at a high level, the enable signal can drive the corresponding first regulator to turn on, and when the enable signal is at a low level, the first regulator corresponding to the enable signal is turned off. Based on this, the enable signal E corresponding to the first regulator 321_i (i is a positive integer greater than or equal to 1 and less than or equal to N-1) is generated. 1_i For example, see Figure 8 , exemplarily shows a schematic diagram of the structure of a first enabling circuit, the first enabling circuit includes a first comparator 41_i, a second comparator 42_i and a first AND gate 43_i. The positive input terminal of the first comparator 41_i is used to receive the i+1th power supply voltage VDD i+1 The negative input terminal of the first comparator 41_i is used to receive the input envelope signal V in The output terminal of the first comparator 41_i is coupled to an input terminal of the first AND gate 43_i; the negative input terminal of the second comparator 42_i is used to receive the i-th power supply voltage VDD i The positive input terminal of the second comparator 42_i is used to receive the input envelope signal V in The output end of the second comparator 42_i is coupled to the other input end of the first AND gate 43_i; the output end of the first AND gate 43_i is coupled to the enable end h of the first regulator 321_i. 4_i In this way, when the input envelope signal V in The voltage is greater than the i-th power supply voltage VDD i And less than the i+1th power supply voltage VDD i+1 , the first comparator 41_i and the second comparator 42_i both output a high level, so the enable signal E output by the first AND gate 43_i is 1_i is at a high level, the enable signal E 1_i The first regulator 321_i can be driven to turn on. On the contrary, when the input envelope signal Vin The voltage is less than or equal to the i-th power supply voltage VDD i , the second comparator 42_i outputs a low level, or, when the input envelope signal V in The voltage is greater than or equal to the i+1th power supply voltage VDD i+1 , the first comparator 41_i outputs a low level, so the enable signal E output by the first AND gate 43_i is 1_i is at a low level, the enable signal E 1_i The first regulator 321_i is turned off.

[0124] use Figure 7 The first sub-circuit 321 and Figure 8 The circuit structure of the first enabling circuit shown is:

[0125] When the input envelope signal V in The voltage is less than the first power supply voltage VDD 1 When, based on Figure 8 In the first enabling circuit shown in FIG. 1 , all enabling signals are at a low level, so the first voltage regulators 321_1 to 321_N-1 are all turned off, the first diode D1 is turned on, and the first power supply voltage VDD 1 The power supply voltage VDD output by the first sub-circuit 321 can flow out to the linear amplifier 330 through the turned-on first diode D1 to power the linear amplifier 330. AB =VDD 1 -V f1 Among them, V f1 is the turn-on voltage of the first diode D1.

[0126] When the input envelope signal V in The voltage increases to be greater than the first power supply voltage VDD 1 and is less than the second power supply VDD 2 When, based on Figure 8 In the first enabling circuit shown in FIG. 1 , the first voltage regulator 321_1 is turned on, the first voltage regulator 321_2 to the first voltage regulator 321_N-1 are turned off, and the second power supply voltage VDD 2 The first regulator 321_1 can be turned on to modulate the input envelope signal V in Changing supply voltage VDD AB After that, it flows out to the linear amplifier 330 to power the linear amplifier 330. At this time, the first diode D1 is reverse biased, and the current therein is zero.

[0127] Similarly, when the input envelope signal V in The voltage continues to increase to be greater than the N-1th power supply voltage VDD N-1And less than the Nth power supply VDD N When the first voltage regulator 321_N-1 is turned on, the first voltage regulators 321_1 to 321_N-2 are turned off, and the Nth power supply voltage VDD N The first regulator 321_N-1 can be turned on to modulate the input envelope signal V in Changing supply voltage VDD AB After that, it flows out to the linear amplifier 330 to power the linear amplifier 330. At this time, the first diode D1 is reverse biased, and the current therein is zero.

[0128] Similar to the structure of the first sub-circuit 321, in a possible implementation, please continue to refer to Figure 7 The second sub-circuit 322 may include M-1 second regulators 322_1 to 322_M-1 and a second diode D2. The power input terminal of the second diode D2 is the first power input terminal g of the second sub-circuit 322. 2_1 , for receiving the first ground power supply voltage VSS provided by the converter 310 1 The power input terminals of the M-1 second voltage regulators 322_1 to 322_M-1 correspond one-to-one to the second power input terminal g of the second sub-circuit 322. 2_2 ~Mth power input terminal g 2_M , for receiving the second ground power supply voltage VSS provided by the converter 310 2 ~Mth ground power supply voltage VSS M For example, the power input terminal j of the second regulator 322_1 1_1 is the second power input terminal g of the second sub-circuit 322 2_2 , for receiving the second ground power supply voltage VSS provided by the converter 310 2 , the power input terminal j of the second regulator 322_2 1_2 The third power input terminal g of the second sub-circuit 322 2_3 , for receiving the third ground power supply voltage VSS provided by the converter 310 3 , ..., the power input terminal j of the second voltage regulator 322_M-1 1_M-1 The Mth power input terminal g of the second sub-circuit 322 2_M , for receiving the Mth ground power supply voltage VSS provided by the converter 310 M The first signal input terminals j of the M-1 second regulators 322_1 to 322_M-1 are 21_1 ~j 21_M-1 After coupling, it serves as the signal input terminal g of the second sub-circuit 322 1 , used to receive the input envelope signal V inThe power output terminals j of the M-1 second voltage regulators 322_1 to 322_M-1 are 3_1 ~j 3_M-1 , a power output terminal of the second diode D2, and a second signal input terminal j of the M-1 second regulators 322_1 to 322_M-1. 22_1 ~j 22_M-1 After coupling, it serves as the power output terminal g of the second sub-circuit 322 3 , used to provide a ground voltage VSS to the linear amplifier 330 AB .

[0129] Furthermore, in the second sub-circuit 322, any second regulator further includes an enable terminal, the enable terminal being used to receive a corresponding enable signal, the enable signal being used to enable the input envelope signal V in When the voltage is greater than the voltage of the ground power supply voltage corresponding to the second voltage regulator and less than the voltage of the previous ground power supply voltage, the current second voltage regulator is controlled to be turned on. Wherein, the previous ground power supply voltage is the minimum ground power supply voltage among the M ground power supply voltages whose voltage is greater than the ground power supply voltage corresponding to the second voltage regulator. For example, please continue to refer to Figure 7 , the enable terminal j of the second regulator 322_1 4_1 Used to receive the enable signal E 2_1 , enable signal E 2_1 For the input envelope signal V in The voltage is greater than the second ground power supply voltage VSS 2 and is less than the first ground power supply voltage VSS 1 When the second voltage regulator 322_1 is turned on, the enable terminal j of the second voltage regulator 322_2 is turned on. 4_2 Used to receive the enable signal E 2_2 , enable signal E 2_2 For the input envelope signal V in The voltage is greater than the third ground power supply voltage VSS 3 and is less than the second ground power supply voltage VSS 2 When the second voltage regulator 322_2 is turned on; ...; the enable terminal j of the second voltage regulator 322_M-1 4_M-1 Used to receive the enable signal E 2_M-1 , enable signal E 2_M-1 For the input envelope signal V in The voltage is greater than the Mth ground power supply voltage VSS M and is less than the M-1th power supply voltage VSS M-1 When the second regulator 322_M-1 is controlled to be turned on.

[0130] It can be understood that the enable signal can realize the enable function by driving at a high level and a low level. For example, in one example, when the enable signal is at a high level, the enable signal can drive the corresponding second regulator to turn on, and when the enable signal is at a low level, the second regulator corresponding to the enable signal is turned off. Based on this, the enable signal E corresponding to the second regulator 322_i (i is a positive integer greater than or equal to 1 and less than or equal to M-1) is generated. 2_i For example, see Fig. 9 , exemplarily shows a schematic diagram of the structure of a second enabling circuit, the second enabling circuit includes a third comparator 51_i, a fourth comparator 52_i and a second AND gate 53_i. The positive input terminal of the third comparator 51_i is used to receive the i-th power supply voltage VSS. i The negative input terminal of the third comparator 51_i is used to receive the input envelope signal V in The output terminal of the third comparator 51_i is coupled to an input terminal of the second AND gate 53_i; the negative input terminal of the fourth comparator 52_i is used to receive the i+1th ground power supply voltage VSS i+1 The positive input terminal of the fourth comparator 52_i is used to receive the input envelope signal V in The output end of the fourth comparator 52_i is coupled to the other input end of the second AND gate 53_i; the output end of the second AND gate 53_i is coupled to the enable end j of the second regulator 322_i. 4_i In this way, when the input envelope signal V in The voltage is less than the i-th ground power supply voltage VSS i and is greater than the (i+1)th ground power supply voltage VSS i+1 , the third comparator 51_i and the fourth comparator 52_i both output a high level, so the enable signal E output by the second AND gate 53_i is 2_i is at a high level, the enable signal E 2_i The second regulator 322_i can be driven to turn on. On the contrary, when the input envelope signal V in The voltage is greater than or equal to the i-th power supply voltage VSS i , the third comparator 51_i outputs a low level, or, when the input envelope signal V in Less than or equal to the (i+1)th power supply voltage VSS i+1 , the fourth comparator 52_i outputs a low level, so the enable signal E output by the second AND gate 53_i is 2_i is at a low level, the enable signal E 2_i The second regulator 322_i is turned off.

[0131] use Figure 7 The second sub-circuit 322 and Fig. 9 The circuit structure of the second enabling circuit shown is:

[0132] When the input envelope signal V in The voltage is greater than the first ground power supply voltage VSS 1 When, based on Fig. 9 In the second enabling circuit shown in FIG. 1 , all enabling signals are at a low level, the second voltage regulators 322_1 to 322_M-1 are all turned off, the second diode D2 is turned on, and the first input terminal a of the converter 310 is turned on. 2_1 Provides a first ground power supply voltage VSS 1 The ground voltage VSS of the linear amplifier 330 can be provided to the linear amplifier 330 through the turned-on second diode D2. AB For: VSS 1 +V f2 Among them, V f2 is the turn-on voltage of the second diode D2.

[0133] When the line input envelope signal V in The voltage of the first ground power supply voltage VSS is reduced to less than the first ground power supply voltage VSS 1 and is greater than the second ground power supply VSS 2 When, based on Fig. 9 In the second enabling circuit shown in FIG. 1 , the second voltage regulator 322_1 is turned on, the second voltage regulators 322_2 to 322_M-1 are turned off, and the second input terminal a of the converter 310 is turned off. 2_2 The second ground power supply voltage VSS is provided 2 The second regulator 322_1 can be turned on to modulate the input envelope signal V in Changing ground voltage VSS AB After that, it is provided to the linear amplifier 330. At this time, the second diode D2 is reverse biased and the current therein is zero.

[0134] Similarly, when the input envelope signal V in The voltage continues to decrease to be less than or equal to the M-1th power supply voltage VSS M-1 and is greater than the Mth ground power supply voltage VSS M When, based on Fig. 9 In the second enabling circuit shown in FIG. 1 , the second voltage regulator 322_M-1 is turned on, the second voltage regulators 322_1 to 322_M-2 are turned off, and the Mth input terminal a of the converter 310 is 2_M Provides the Mth ground power supply voltage VSS M The second regulator 322_M-1 can be turned on to modulate the voltage to follow the input envelope signal V in Changing ground voltage VSS AB After that, it is provided to the linear amplifier 330. At this time, the second diode D2 is reverse biased and the current therein is zero.

[0135] By adopting the above-mentioned sub-circuit structure three, by setting a first diode, N-1 first voltage regulators of a parallel structure and a corresponding enabling circuit, a power supply with the minimum power consumption and power supply capability can be selected from N gears to power the class AB amplifier. By setting a second diode, M-1 second voltage regulators of a parallel structure and a corresponding enabling circuit, a ground power supply with the minimum power consumption and power supply capability can be selected from M gears to power the class AB amplifier. This power supply selection method is more detailed and can be more flexibly adapted to various power supply scenarios, effectively reducing the modulation loss of the power supply end and the ground power supply end. In addition, the series structure in the sub-circuit structure two will form a power supply network composed of several voltage regulators connected in series, but the parallel structure in the voltage selection circuit structure three has only one voltage regulator turned on at a time, so that the impedance loss of the voltage regulator is small, which is more efficient than the series structure, but due to multiple enabling circuits, the circuit control is more complicated.

[0136] It should be noted that subcircuit structure 1 can also be regarded as a special case of subcircuit structure 2 and subcircuit structure 3. Also, the above are just illustrative introductions of three possible structures of subcircuits, and the schemes in the above three subcircuit structures can also be mutually structured to form a new linear amplifier. For example:

[0137] For a possible combination, see Fig.10a , showing a schematic diagram of the structure of another power processing circuit provided by the present application, the linear amplifier is formed by combining the first sub-circuit 321 in the above sub-circuit structure 2 and the second sub-circuit 322 in the above sub-circuit structure 3. In other words, the first sub-circuit 321 adopts a voltage regulator series structure, and the second sub-circuit 322 selects a voltage regulator parallel structure;

[0138] For another possible combination, see Fig.10b , showing a structural schematic diagram of another power processing circuit provided by the present application, the linear amplifier is formed by combining the second sub-circuit 322 in the above-mentioned sub-circuit structure 2 and the first sub-circuit 321 in the above-mentioned sub-circuit structure 3. In other words, the first sub-circuit 321 adopts a parallel regulator structure, and the second sub-circuit 322 selects a series regulator structure.

[0139] It is understandable that there are many possible combinations, which are not listed here one by one.

[0140] 3. Switching Amplifier

[0141] It can be understood that the switching amplifier 340 can be used to provide the DC and low-frequency parts of the current required by the load. The switching amplifier 340 can be a direct current / direct current (DC / DC) converter, such as a boost DC / DC converter, a buck DC / DC converter, or a buck-boost DC / DC converter. Alternatively, it can also be a multi-level structure or a multi-phase structure, etc., which is not specifically limited. The switching amplifier 340 can generally include a power switch tube, a control circuit, a filter inductor and a filter capacitor, etc. By converting the input analog signal into a pulse signal, the pulse signal can be used to control the high-power switching device.

[0142] The above content introduces the possible structures of various functional devices in the envelope tracking modulator. The following introduces the waveform changes of various electrical signals in the envelope tracking modulator shown in this application from the perspective of power supply waveform. Figure 5 The envelope tracking modulator shown is an example.

[0143] See also Fig.11a , exemplarily showing a voltage waveform diagram provided by the present application. It should be noted that although Fig.11a The input envelope signal V is not shown. in waveform, but since the output signal V out Follows the input envelope signal V in , so the input envelope signal V in The waveform can be considered as the output signal V out The waveform obtained by shifting the waveform forward by a small period of time.

[0144] Combine together Figure 5 and Fig.11a , look at the power supply end: when the input envelope signal V in The voltage is lower than the low power supply voltage VDD 1 When, for example, during the period 0 to t2, the period t3 to t7, and the period after t8, the low power supply voltage VDD 1 The power supply voltage VDD of the linear amplifier 330 flows to the linear amplifier 330 through the turned-on first diode D1. AB For low power supply voltage VDD 1 Subtract the turn-on voltage of the first diode D1. When the input envelope signal V in The voltage increases to be greater than the low power supply voltage VDD 1 And less than the high power supply voltage VDD 2 When, for example, during the period t2 to t3 and the period t7 to t8, the high power supply voltage VDD 2The first regulator 3211 is turned on and flows to the linear amplifier 330. The first regulator 3211 uses the high power supply voltage VDD 2 The supply voltage VDD of the linear amplifier 330 AB Modulated into the output voltage V of the linear amplifier 330 out The DC bias voltage of the first regulator 3211 is added.

[0145] Combine together Figure 5 and Fig.11a , look at the ground power supply end: when the input envelope signal V in The voltage is greater than the high ground power supply voltage VSS 1 When, for example, in the period from 0 to t0, the period from t1 to t5, and the period after t6, the high ground power supply voltage VSS 1 The ground voltage VSS of the linear amplifier 330 is provided to the linear amplifier 330 through the turned-on second diode D2. AB The ground supply voltage VSS is high 1 Plus the turn-on voltage of the second diode D2. When the input envelope signal V in The voltage decreases to less than the high ground power supply voltage VSS 1 and is greater than the ground voltage VSS G When, for example, during the period t0 to t1 and the period t5 to t6 shown in the figure, the low ground voltage VSS G The second regulator 3221 is turned on and provided to the linear amplifier 330. Therefore, the second regulator 3221 provides the low ground voltage VSS to the linear amplifier 330. G Modulated into the output voltage V of the linear amplifier 330 out After subtracting the DC bias voltage of the second regulator 3221, the ground voltage VSS of the linear amplifier 330 is obtained. AB .

[0146] according to Fig.11a It can be seen from the voltage waveform shown that by adopting the envelope tracking modulator structure shown in the present application, the power supply of the class AB amplifier is either a DC voltage or follows the output voltage changes, and its output voltage waveform will not be distorted due to power switching, so it can have high linearity.

[0147] For further information, see Fig.11b , which exemplifies a current waveform diagram provided by the present application. Please refer to Figure 5 and Fig.11a , where I la is the output current of the linear amplifier 330, I sa is the output current of the switching amplifier 340, I out To track the output current of the envelope modulator 300, I D1is the current flowing through the first diode D1, I D2 is the current flowing through the second diode D2, I DOP1 is the current flowing through the first regulator 3211, I DOP2 is the current flowing through the second regulator 3221.

[0148] Understandably, I la ,I sa and I out There is a certain correlation between them. For example, see Figure 5 It can be seen that, assuming that the current amplification factor of the switching amplifier 340 is α(s), s is the switching frequency, then I la ,I sa and I out The following formulas (1.1) and (1.2) can be satisfied:

[0149] I sa =α(s)×I la ……(1.1)

[0150] I out =I la +I sa ……(1.2)

[0151] Thus, by combining the above formula (1.1) and formula (1.2), we can get the following formula (1.3):

[0152]

[0153] In combination with the above formula (1.3), the loss reduction function that can be achieved by this application is introduced below.

[0154] See also Figure 1a or Figure 1b , using traditional linear amplifier, the current consumption P sourcing Satisfying the following formula (2.1), the absorption current loss P sinking Satisfying the following formula (2.2), bias current loss P bias Satisfies the following formula (2.3):

[0155]

[0156]

[0157]

[0158] Where T is the sampling period; I sourcing is the common current, satisfying the following formula (2.4); I sinking To absorb current, the following formula (2.5) is satisfied:

[0159]

[0160]

[0161] However, see Figure 5 , using the linear amplifier provided in this application, when the power supply VDD of the linear amplifier AB Generated by the first diode D1, and the ground power supply VSS of the linear amplifier AB When generated by the second diode D2, the total current loss P sourcing Satisfying the following formula (3.1), the absorption current loss P sinking Satisfying the following formula (3.2), bias current loss P bias Satisfies the following formula (3.3):

[0162]

[0163]

[0164]

[0165] Among them, Figure 5 As shown, VDD 2 、VSS G VDD and VSS configured as a conventional linear amplifier G , and VDD 2 >VDD 1 , VSS 1 >VSS G Therefore, the voltage in the integral symbol in the above formula (3.1) to formula (3.3) is smaller than the voltage in the integral symbol in the above formula (2.1) to formula (2.3). Therefore, the overall loss of the linear amplifier shown in this application is lower than the power consumption of the traditional linear amplifier. It can be seen that this application can greatly reduce the voltage drop of the current passing through the linear amplifier by using a class G linear amplifier to dynamically select the power supply into which the current flows and the ground power supply out of which the current flows, thereby effectively improving the efficiency of envelope tracking modulation.

[0166] Based on the structure and functional principle of the envelope tracking modulator described above, the present application can also provide a transmitting device. Fig.12, is a possible functional framework diagram of a transmitting device provided in the present application, wherein the transmitting device 1200 may include a transmitter 1210, an envelope tracking modulator 1220 and a power amplifier 1230, wherein the transmitter 1210 is coupled to the envelope tracking modulator 1220 and the power amplifier 1230 respectively, and the envelope tracking modulator 1220 may also be coupled to the power amplifier 1230. Among them, the envelope tracking modulator 1220 may be the envelope tracking modulator in any of the above embodiments. When the transmitting device 1200 is working, the transmitter 1210 is used to output an envelope signal to the envelope tracking modulator 1220, and to output a radio frequency transmission signal to the power amplifier 1230; the envelope tracking modulator 1220 is used to generate a power supply voltage according to the envelope signal, and use the power supply voltage to power the power amplifier 1230; the power amplifier 1230 is used to amplify the power of the radio frequency transmission signal output by the transmitter 1210 under the drive of the power supply voltage and output it.

[0167] Understandably, Fig.12 In the description, the envelope signal is taken as an example from the transmitter 1210. In other embodiments, the envelope signal may also come from the baseband processor. In this case, the transmitter 1210 may only output the RF transmission signal to the power amplifier 1230, and the envelope tracking modulator 1220 is used to generate a power supply voltage according to the envelope signal from the baseband processor, and use the power supply voltage to power the power amplifier 1230.

[0168] It should be noted that Fig.12 Take the transmitter 1210 coupled with a power amplifier 1230 as an example. However, the transmitter 1210 can also be coupled with multiple power amplifiers at the same time. Specifically, the transmitter 1210 can correspond to multiple transmission channels, and each transmission channel can include multiple devices, for example, a power amplifier. A transmission channel can include one power amplifier or multiple power amplifiers, and the multiple power amplifiers can operate in different frequency bands or different modes. Each power amplifier can be powered by an envelope tracking modulator. In addition, the transmission channel can also include other devices, such as phase shifters, filters, antenna switches, mixers, digital-to-analog converters (DAC), modulators, etc. The types of devices included in the transmission channel are not specifically limited in the embodiments of the present application.

[0169] in addition, Fig.12 The circuit diagram does not constitute a specific limitation on the transmitting device. In other embodiments of the present application, the transmitting device may include more or fewer components than shown in the figure, or combine some components, or split some components, or arrange the components differently, or arrange them in different positions, without specific limitation.

[0170] Based on the structure and functional principle of the transmitting device described above, the present application can also provide a terminal device. For example, see Fig.13 , is a possible functional framework diagram of a terminal device provided by the present application, the terminal device 1300 may include a baseband processor 1310 and a transceiver 1330, or may also include a memory 1320, and the memory 1320 may be a volatile memory or a non-volatile memory. The baseband processor 1310 and its peripheral components, such as the transceiver 1330 and the memory 1320, may be coupled via a bus, such as via an IO bus. For example, the baseband processor 1310 may read and write data in the memory 1320 via the IO bus, and may control the transceiver 1330 to send or receive data.

[0171] The baseband processor 1310 includes one or more processing units, such as an application processor (AP), a modem processor, a graphics processing unit (GPU), an image signal processor (ISP), a controller, a video codec, a digital signal processor (DSP), a baseband processor, and / or a neural-network processing unit (NPU), etc. Different processing units may be independent devices or integrated into one or more processors.

[0172] It can be understood that the aforementioned transmitting device can be integrated into the transceiver 1330. The transceiver 1330 can also be replaced by a transmitter. The transceiver 1330 can enable the terminal device 1300 to communicate wirelessly with the outside world, and it can provide wireless local area networks (WLAN) (such as wireless fidelity (Wi-Fi) networks), Bluetooth (BT), global navigation satellite system (GNSS), frequency modulation (FM), near field communication technology (NFC), infrared technology (IR) and other wireless communication solutions. The transceiver 1330 can be one or more devices integrating at least one communication processing module. The transceiver 1330 receives electromagnetic waves via an antenna, modulates and filters the electromagnetic wave signal, and sends the processed signal to the baseband processor 1310. The transceiver 1330 can also receive the signal to be sent from the baseband processor 1310, modulate and amplify it, and convert it into electromagnetic waves for radiation through the antenna.

[0173] The memory 1320 may specifically be an internal memory, which may be used to store computer executable program codes, and the executable program codes include instructions. The internal memory may include a program storage area and a data storage area. Among them, the program storage area may store an operating system, an application required for at least one function (such as a call function, a time setting function, etc.), etc. The data storage area may store data created during the use of the electronic device (such as a phone book, world time, etc.), etc. In addition, the internal memory may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, a universal flash memory (Universal Flash Storage, UFS), etc. The baseband processor 1310 executes various functional applications and data processing of the terminal device 1300 by running instructions stored in the internal memory.

[0174] In some scenarios, the terminal device 1300 may further include an external memory interface, and the terminal device 1300 may couple an external memory card, such as a Micro SD card, through the external memory interface to expand its storage capacity. For example, the external memory card communicates with the processor 1310 through the external memory interface to implement a data storage function.

[0175] It should be noted that Fig.13The terminal device functional framework given is only an example. In other embodiments of the present application, the terminal device may include more or fewer components than shown in the figure, or combine some components, or split some components, or arrange the components differently. The components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.

[0176] In the various embodiments of the present application, unless otherwise specified or provided for in any logical conflict, the terms and / or descriptions between the different embodiments are consistent and may be referenced to each other, and the technical features in the different embodiments may be combined to form new embodiments according to their inherent logical relationships.

[0177] In the present application, "at least one" means one or more, and "more" means two or more. "And / or" describes the association relationship of associated objects, indicating that there may be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple. In the text description of the present application, the character " / " generally indicates that the associated objects before and after are in an "or" relationship. In the formula of the present application, the character " / " indicates that the associated objects before and after are in a "divided" relationship. In addition, in the present application, the word "exemplarily" is used to indicate examples, illustrations or explanations. Any embodiment or design described as an "example" in this application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Alternatively, it can be understood that the use of the word "example" is intended to present concepts in a specific way and does not limit this application.

[0178] It is to be understood that the various digital numbers involved in the present application are only for the convenience of description and are not intended to limit the scope of the embodiments of the present application. The size of the sequence number of the above-mentioned processes does not mean the order of execution, and the order of execution of each process should be determined by its function and inherent logic. The terms "first", "second" and similar expressions are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, including a series of steps or units. Methods, systems, products or equipment are not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment.

Claims

1. An envelope tracking modulator, characterized in that: include: A converter, a power processing circuit, a linear amplifier and a switching amplifier, wherein the power processing circuit is coupled to the converter and the linear amplifier respectively, and the linear amplifier is also coupled to the switching amplifier; The converter is used to provide a plurality of power supply voltages to the power processing circuit; The power supply processing circuit is used to determine the target power supply voltage of the linear amplifier at each moment according to the multiple power supply voltages and the voltage of the input envelope signal at each moment, and the target power supply voltage at any moment is determined according to the power supply voltage with the smallest voltage difference with the input envelope signal at that moment among the multiple power supply voltages; The linear amplifier is used to linearly amplify the input envelope signal under the bias of the target power supply voltage, generate a first output signal and provide it to the power amplifier; The switching amplifier is used to amplify the current of the first output signal, generate a second output signal and provide the second output signal to the power amplifier.

2. The envelope tracking modulator according to claim 1, characterized in that At any moment, the target power supply voltage of the linear amplifier is a DC voltage or a voltage that changes with the input envelope signal.

3. The envelope tracking modulator according to claim 1 or 2, characterized in that: The multiple power supply voltages satisfy any of the following conditions: The multiple power supply voltages include multiple power supply voltages, but do not include a ground power supply voltage; The plurality of power supply voltages include a power supply voltage and at least one ground supply voltage; The multiple power supply voltages include multiple power supply voltages and at least one ground power supply voltage; Wherein, a minimum ground power voltage among the at least one ground power voltage is greater than the ground voltage.

4. The envelope tracking modulator according to any one of claims 1 to 3, characterized in that: The plurality of power supply voltages include a first power supply voltage to an Nth power supply voltage with increasing voltage values ​​in sequence, and the target power supply voltage includes a target power supply voltage; When the minimum power supply voltage between the first power supply voltage and the Nth power supply voltage that is greater than the voltage corresponding to the input envelope signal at the first moment is the first power supply voltage, the target power supply voltage of the linear amplifier at the first moment is a DC voltage, and the DC voltage is determined according to the first power supply voltage; When the minimum power supply voltage among the first power supply voltage to the Nth power supply voltage that is greater than the voltage corresponding to the input envelope signal at the first moment is not the first power supply voltage, the target power supply voltage of the linear amplifier at the first moment is a voltage that changes with the input envelope signal.

5. The envelope tracking modulator according to any one of claims 1 to 4, characterized in that: The plurality of power supply voltages include at least one ground power supply voltage, and a minimum ground power supply voltage among the at least one ground power supply voltage is greater than a ground voltage, and the target power supply voltage includes a target ground power supply voltage; When the maximum voltage of the at least one ground power supply voltage and the ground voltage that is less than the voltage corresponding to the input envelope signal at the first moment is the maximum ground power supply voltage among the at least one ground power supply voltage, the target ground power supply voltage of the linear amplifier at the first moment is a DC voltage, and the DC voltage is determined according to the maximum ground power supply voltage; When the maximum voltage of the at least one ground power supply voltage and the ground voltage that is less than the voltage of the input envelope signal at the first moment is not the maximum ground power supply voltage of the at least one ground power supply voltage, the target ground power supply voltage of the linear amplifier at the first moment is a voltage that follows the change of the input envelope signal.

6. The envelope tracking modulator according to any one of claims 1 to 5, characterized in that: The converter comprises a first output terminal to an Nth output terminal, wherein the first output terminal to the Nth output terminal are used to output a first power supply voltage to an Nth power supply voltage with increasing voltage values ​​in sequence, where N is an integer greater than or equal to 2; The power processing circuit comprises a first sub-circuit, wherein the first power input terminal to the Nth power input terminal of the first sub-circuit are coupled to the first output terminal to the Nth output terminal of the converter in a one-to-one correspondence, and the signal input terminal of the first sub-circuit is coupled to the first signal input terminal of the linear amplifier for receiving the input envelope signal; the power output terminal of the first sub-circuit is coupled to the power supply input terminal of the linear amplifier, and the second signal input terminal of the linear amplifier is coupled to the signal output terminal of the linear amplifier; The first sub-circuit is used to determine, at any moment, a minimum power supply voltage that is greater than a voltage corresponding to an input envelope signal at the moment based on the first power supply voltage to the Nth power supply voltage; if the minimum power supply voltage is the first power supply voltage, the first power supply voltage is provided to the linear amplifier; if the minimum power supply voltage is not the first power supply voltage, the minimum power supply voltage is modulated to generate a power supply signal that follows the input envelope signal and provide the power supply signal to the linear amplifier.

7. The envelope tracking modulator of claim 6, wherein: The value of N is 2: The first subcircuit comprises a first voltage regulator and a first diode, a power input end of the first diode is a first power input end of the first subcircuit, a power input end of the first voltage regulator is a second power input end of the first subcircuit, a first signal input end of the first voltage regulator is a first signal input end of the first subcircuit, and the second signal input end of the first voltage regulator, a power output end of the first voltage regulator and a power output end of the first diode are coupled to serve as a power output end of the first subcircuit; The first diode is used to be turned on when the voltage corresponding to the input envelope signal is less than the first power supply voltage, and turned off when the voltage corresponding to the input envelope signal is greater than or equal to the first power supply voltage; The first voltage regulator is configured to be turned off when the voltage corresponding to the input envelope signal is less than the first power supply voltage, and to be turned on when the voltage corresponding to the input envelope signal is greater than or equal to the first power supply voltage and less than the second power supply voltage, and, in the turned-on state, to modulate the second power supply voltage to generate a power supply signal that follows the input envelope signal and provide the power supply signal to the linear amplifier.

8. The envelope tracking modulator of claim 6, wherein: The value of N is an integer greater than or equal to 3: The first subcircuit comprises N-1 first voltage regulators and N-1 first diodes corresponding to the N-1 first voltage regulators one by one, the N-1 first voltage regulators are connected in series in sequence, the power input end of the previous first voltage regulator is coupled with the power output end of the next first voltage regulator, the power output end of the first voltage regulator located at the head end of the series connection is the power output end of the first subcircuit, the power input end of the first voltage regulator located at the tail end of the series connection is the Nth power input end of the first subcircuit, the first signal input ends of the N-1 first voltage regulators are coupled as the signal input end of the first subcircuit; the power input ends of the N-1 first diodes correspond to the first power input end to the N-1th power input end of the first subcircuit, and the power output end of any first diode is coupled with the power output end of the corresponding first voltage regulator and then connected to the second signal input end of the corresponding first voltage regulator; Any first diode, configured to be turned on when the voltage corresponding to the input envelope signal is less than the power supply voltage received by the first diode, and to be turned off when the voltage corresponding to the input envelope signal is greater than or equal to the power supply voltage received by the first diode; Any first voltage regulator is used to turn off when the voltage corresponding to the input envelope signal is less than the power supply voltage received by the corresponding first diode, turn on when the voltage corresponding to the input envelope signal is greater than or equal to the power supply voltage received by the corresponding first diode and less than the next power supply voltage, and, in the turned-on state, modulate the next power supply voltage to generate a power supply signal that follows the input envelope signal and provide it to the linear amplifier; wherein the next power supply voltage is a minimum power supply voltage among the N power supply voltages that is greater than the power supply voltage received by the corresponding first diode.

9. The envelope tracking modulator of claim 6, wherein: The value of N is an integer greater than or equal to 3: The first subcircuit comprises a first diode and N-1 first voltage regulators, the power input end of the first diode is the first power input end of the first subcircuit, the power input ends of the N-1 first voltage regulators correspond to the second power input end to the Nth power input end of the first subcircuit, the first signal input ends of the N-1 first voltage regulators are coupled as the signal input end of the first subcircuit, and the second signal input ends of the N-1 first voltage regulators, the power output end of the N-1 first voltage regulators and the power output end of the first diode are coupled as the power output end of the first subcircuit; Any first voltage regulator further includes an enable terminal, the enable terminal is used to receive an enable signal, the enable signal is used to control the first voltage regulator to turn on when the voltage corresponding to the input envelope signal is less than the power supply voltage received by the first voltage regulator and greater than the previous power supply voltage; wherein the previous power supply voltage is a maximum power supply voltage among N power supply voltages that is less than the power supply voltage received by the first voltage regulator; The first diode is used to be turned on when the voltage corresponding to the input envelope signal is less than the first power supply voltage, and turned off when the voltage corresponding to the input envelope signal is greater than or equal to the first power supply voltage; Any first voltage regulator is used to modulate the power supply voltage received by the first voltage regulator in an on state, generate a power supply signal that follows the input envelope signal and provide the power supply signal to the linear amplifier.

10. The envelope tracking modulator of claim 9, wherein: The first sub-circuit further includes N-1 first enabling circuits corresponding one-to-one to the N-1 first regulators. For any first enabling circuit: The device comprises a first comparator, a second comparator and a first AND gate, wherein the positive input terminal of the first comparator is used to receive the power supply voltage received by the first voltage regulator, the negative input terminal of the first comparator is used to receive the input envelope signal, and the output terminal of the first comparator is coupled to an input terminal of the first AND gate; The negative input terminal of the second comparator is used to receive the previous power supply voltage, the positive input terminal of the second comparator is used to receive the input envelope signal, the output terminal of the second comparator is coupled to the other input terminal of the first AND gate; the output terminal of the first AND gate is coupled to the enable terminal of the corresponding first regulator.

11. The envelope tracking modulator according to any one of claims 1 to 10, characterized in that: The converter includes a first input terminal to an Mth input terminal, wherein the first input terminal to the Mth input terminal are used to provide a first ground power supply voltage to an Mth ground power supply voltage with decreasing voltage values ​​in sequence, where M is a positive integer; The power processing circuit includes a second sub-circuit, the first signal input terminal of the linear amplifier is coupled to the signal input terminal of the second sub-circuit for receiving the input envelope signal; the second signal input terminal of the linear amplifier is coupled to the signal output terminal of the linear amplifier, the ground power input terminal of the linear amplifier is coupled to the power output terminal of the second sub-circuit, and the first power input terminal to the Mth power input terminal of the second sub-circuit are coupled to the first input terminal to the Mth input terminal of the converter in a one-to-one correspondence; The second sub-circuit is used to determine a maximum voltage that is less than the voltage of the input envelope signal at any time based on the first ground power supply voltage to the Mth ground power supply voltage and the ground voltage, and if the maximum voltage is the first ground power supply voltage, provide the first ground power supply voltage to the linear amplifier; if the minimum voltage is not the first ground power supply voltage, modulate the minimum voltage to generate a power supply signal that follows the input envelope signal and provide the power supply signal to the linear amplifier.

12. The envelope tracking modulator of claim 11, wherein: The value of M is 1: The second subcircuit comprises a second voltage regulator and a second diode, wherein the power output end of the second voltage regulator, the power output end of the second diode and the second signal input end of the second voltage regulator are coupled to serve as the power output end of the second subcircuit, the power input end of the second diode is the power input end of the second subcircuit, the first signal input end of the second voltage regulator is the first signal input end of the second subcircuit, and the power input end of the second voltage regulator is grounded; The second diode is used to be turned on when the voltage corresponding to the input envelope signal is greater than the ground power supply voltage provided by the converter, and turned off when the voltage corresponding to the input envelope signal is less than or equal to the ground power supply voltage provided by the converter; The second voltage regulator is configured to be turned off when the voltage corresponding to the input envelope signal is greater than the ground power supply voltage provided by the converter, and to be turned on when the voltage corresponding to the input envelope signal is less than or equal to the ground power supply voltage provided by the converter and greater than the ground voltage, and, in the turned-on state, to modulate the ground voltage to generate a power supply signal that changes with the input envelope signal and provide the power supply signal to the linear amplifier.

13. The envelope tracking modulator of claim 11, wherein: The value of M is an integer greater than or equal to 2: The second subcircuit comprises M second voltage regulators and M second diodes corresponding to the M second voltage regulators one by one, the power input ends of the M second diodes correspond to the first power input end to the Mth power input end of the second subcircuit, and the first signal input ends of the M second voltage regulators are coupled as the signal input end of the second subcircuit; the M second voltage regulators are sequentially connected in series, the power input end of the first second voltage regulator is coupled with the power output end of the second second voltage regulator, the second signal input end of the second second voltage regulator and the power output end of the corresponding second diode respectively, the power output end of the second voltage regulator located at the head end of the series connection, the second signal input end of the second voltage regulator located at the head end of the series connection and the power output end of the corresponding second diode are coupled as the power output end of the second subcircuit, and the power input end of the second voltage regulator located at the tail end of the series connection is grounded; Any second diode, configured to be turned on when the voltage corresponding to the input envelope signal is greater than the ground power supply voltage received by the second diode, and to be turned off when the voltage corresponding to the input envelope signal is less than or equal to the ground power supply voltage received by the second diode; Any second voltage regulator is used to turn off when the voltage corresponding to the input envelope signal is greater than the ground power voltage received by the corresponding second diode, turn on when the voltage corresponding to the input envelope signal is less than or equal to the ground power voltage received by the corresponding second diode and greater than the next ground power voltage, and, in the turned-on state, modulate the ground power voltage received by the corresponding second diode to generate a power signal that follows the input envelope signal and provide it to the linear amplifier; wherein the next ground power voltage is a maximum ground power voltage among the M ground power voltages that is less than the ground power voltage received by the corresponding second diode.

14. The envelope tracking modulator of claim 11, wherein: The value of M is an integer greater than or equal to 2: The second subcircuit comprises a second diode and M-1 second voltage regulators, the power input end of the second diode is the first power input end of the second subcircuit, the power input ends of the M-1 second voltage regulators correspond to the second power input end to the Mth power input end of the second subcircuit, the first signal input ends of the M-1 second voltage regulators are coupled as the signal input end of the second subcircuit, and the second signal input ends of the M-1 second voltage regulators, the power output ends of the M-1 second voltage regulators and the power output end of the second diode are coupled as the power output end of the second subcircuit; Any second voltage regulator further includes an enable terminal, the enable terminal is used to receive an enable signal, the enable signal is used to control the second voltage regulator to turn on when the voltage corresponding to the input envelope signal is greater than the ground power voltage received by the second voltage regulator and less than the previous ground power voltage; wherein the previous ground power voltage is the maximum ground power voltage among the M ground power voltages that is less than the ground power voltage received by the second voltage regulator; The second diode is used to be turned on when the voltage corresponding to the input envelope signal is greater than the first ground power supply voltage, and turned off when the voltage corresponding to the input envelope signal is less than or equal to the first ground power supply voltage; Any second voltage regulator is used to modulate the ground power supply voltage received by the second voltage regulator in an on state, generate a power supply signal that follows the input envelope signal and provide the power supply signal to the linear amplifier.

15. The envelope tracking modulator of claim 14, wherein: The second sub-circuit further includes M-1 second enabling circuits corresponding one-to-one to the M-1 second regulators. For any second enabling circuit: The device comprises a third comparator, a fourth comparator and a second AND gate, wherein the positive input terminal of the third comparator is used to receive the upper ground power supply voltage, the negative input terminal of the third comparator is used to receive the input envelope signal, and the output terminal of the third comparator is coupled to an input terminal of the second AND gate; The negative input terminal of the fourth comparator is used to receive the ground power supply voltage received by the corresponding second voltage regulator, the positive input terminal of the fourth comparator is used to receive the input envelope signal, the output terminal of the fourth comparator is coupled to the other input terminal of the second AND gate; the output terminal of the second AND gate is coupled to the enable terminal of the corresponding second voltage regulator.

16. A launching device, characterized in that: A transmitter, a power amplifier and an envelope tracking modulator according to any one of claims 1 to 15, wherein the transmitter is coupled to the power amplifier and the envelope tracking modulator respectively; The transmitter is used to output a radio frequency transmission signal to the power amplifier; The envelope tracking modulator is used to generate a power supply signal according to the envelope signal from the transmitter or the baseband processor, and use the power supply signal to power the power amplifier; The power amplifier is used to amplify the power of the radio frequency transmission signal under the drive of the power supply signal.

17. A terminal device, characterized in that: comprising a baseband processor and a transmitting device as claimed in claim 16; The baseband processor is used to send the signal to be sent to the transmitting device; The transmitting device is used to frequency modulate and amplify the signal to be sent and transmit it.

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