WO2021062685A1

WO2021062685A1 - Envelope tracking modulator and transmitting device

Info

Publication number: WO2021062685A1
Application number: PCT/CN2019/109570
Authority: WO
Inventors: 李伟男; 钱耀
Original assignee: 华为技术有限公司
Priority date: 2019-09-30
Filing date: 2019-09-30
Publication date: 2021-04-08
Also published as: CN114514488A

Abstract

An envelope tracking modulator (ETM) and a transmitting device, for use in solving the problem of mutual influence between different types of power amplifiers (PA) in an existing ET/APT dual-mode power supply. The ETM comprises: a single-input dual-output DC/DC converter (201), having a first output end used for outputting a first power supply voltage and a second output end used for outputting a first direct current (DC) voltage, the first power supply voltage being used for driving at least one first power amplifier (APT PA) using an APT mode; a single-input single-output DC/DC converter (202), having an output end used for outputting a second DC voltage; and a linear amplifier (203) used for amplifying an envelope signal under power provision of the first DC voltage and outputting a first alternating current voltage, the second DC voltage and the first alternating current voltage constituting a second power supply voltage, and the second power supply voltage being used for driving at least one second power amplifier (ET PA) using an ET mode.

Description

Envelope tracking modulator and launching device

Technical field

This application relates to the field of chip technology, in particular to an envelope tracking modulator and a transmitting device.

Background technique

Envelope tracking (ET) is a technology that dynamically adjusts the power supply voltage of a power amplifier (PA) in real time according to the envelope amplitude information of the modulation signal. The power supply implemented by the ET technology can be called an ET power supply. Using this technology can save PA power consumption, but because the load capacitance of the PA Vcc side will limit the maximum signal bandwidth supported by the ET power supply, when the load capacitance of the PA is large, using the ET technology to drive the PA will cause the ET power supply to fail. Bandwidth is affected.

Average power tracking (APT) is a technology that adjusts the power supply voltage of the PA according to the average power of the transmitted signal subframe. The power supply implemented by the APT technology can be called an APT power supply. Compared with the ET scheme, the APT scheme does not need to track the signal envelope in real time. The overall scheme of the APT power supply is simpler and generally has no restriction on the load on the VCC end of the PA.

Generally, the transmitter of the terminal can be connected to multiple PAs, and each PA can be driven by ET technology or APT technology according to its own operating frequency band, mode, or signal bandwidth. An ET/APT power supply driving scheme in the prior art can be as shown in FIG. 1. In Figure 1, multiple PAs in the same transmit channel are linked to the same envelope tracking modulator (ETM), and the ETM is compatible with both the ET working mode and the APT working mode. Among them, if the ETM works in the APT mode, the single-output Buck converter or the Buck-boost converter used in the ET mode can be reused. In other words, ETM uses the same converter in ET mode and APT mode.

Using the scheme shown in Figure 1, due to the influence of the PA's VCC power capacitor, when ETM works in ET mode, the VCC power capacitor of the PA driven in APT mode (hereinafter referred to as APT PA) can be regarded as the PA driven in ET mode. (Hereinafter referred to as ET PA) load, so the power capacitor of APT PA will affect ET PA, which limits the bandwidth of ET PA.

Therefore, the existing ET/APT dual-mode power supply has the problem of mutual influence between different types of power amplifiers (that is, between ET PA and APT PA).

Summary of the invention

The embodiments of the present application provide an envelope tracking modulator and a transmitting device, which are used to solve the problem of mutual influence between different types of power amplifiers existing in the existing ET/APT dual-mode power supply.

In the first aspect, an embodiment of the present application provides an envelope tracking modulator, including: a single-input dual-output DC DC/DC converter, and a first output terminal of the single-input dual-output DC/DC converter is used to output a first power source The second output terminal of the single-input dual-output DC/DC converter is used to output the first DC voltage, and the first power supply voltage is used to drive at least one first power amplifier using the average power tracking APT mode; single-input single-output DC/ DC converter, the output terminal of the single-input single-output DC/DC converter is used to output the second DC voltage; the linear amplifier is used to amplify the envelope signal under the power of the first DC voltage to output the first AC voltage, The second DC voltage and the first AC voltage form a second power supply voltage, and the second power supply voltage is used to drive at least one second power amplifier in an envelope tracking ET manner.

Among them, at least one first power amplifier can work in 2G frequency band or 5G frequency band, and at least one second power amplifier can work in 3G frequency band or 4G frequency band.

Using the envelope tracking modulator provided in the first aspect, for at least one first power amplifier and at least one second power amplifier, only one ETM can be used as a power source, and the APT PA (first power amplifier) is separated at the output of the ETM And ET PA (Second Power Amplifier), that is, drive ET PA and APT PA separately, so as to realize load isolation and reduce the influence between different types of power amplifiers.

Specifically, the ETM includes two DC/DC converters, and the output first power voltage of the single-input dual-output DC/DC converter supplies power to at least one first power amplifier in the APT mode. In ET mode, the single-input single-output DC/DC converter converts the output voltage of the single-input dual-output DC/DC converter to DC/DC (or directly converts the battery voltage output by the ETM input power pin to DC/DC). After DC conversion), the second DC voltage is output. The first DC voltage output by the single-input dual-output DC/DC converter supplies power to the linear amplifier, which amplifies the input envelope signal (from the transmitter) and outputs the first AC voltage, the second DC voltage and the first AC voltage A second power supply voltage is formed for driving at least one second power amplifier.

In a possible design, the single-input single-output DC/DC converter is powered by the input power pin of the envelope tracking modulator or by the first DC voltage output by the single-input dual-output DC/DC converter.

Using the above solution, two power supply modes are provided for a single-input single-output DC/DC converter.

In addition, the envelope tracking modulator may further include: a first switch unit, both ends of the first switch unit are respectively connected to the input power pin of the envelope tracking modulator and the first output terminal of the single-input dual-output DC/DC converter Coupling, used to close in the first time period after the envelope tracking modulator is started; the second switch unit, the two ends of the second switch unit are respectively connected to the ground pin of the envelope tracking modulator and the single-input dual-output DC/ The first output terminal of the DC converter is coupled for closing in a second time period after the envelope tracking modulator is powered off.

With the above solution, when charging the load (that is, when increasing the output power of the power amplifier), the first switch unit is closed in the first time period, and the load can be charged directly through the input power pin of the ETM, thereby reducing the voltage Response time: When discharging the load (that is, when reducing the output power of the power amplifier), the second switch unit is closed in the second time period. At this time, the load can be discharged directly through the ground pin of the ETM, thereby reducing the voltage Response time.

In a possible design, the second power amplifier includes at least two stages of amplifiers, the first stage of the at least two stages of amplifiers is driven by an independent power supply pin of the envelope tracking modulator, and the latter stage of the at least two stages of amplifiers The amplifier is driven by the second power supply voltage.

With the above solution, since the ET operating mode is sensitive to the VCC capacitive load of the second power amplifier, the two-stage power supply method can further reduce the load of the second power amplifier and increase the bandwidth of the second power supply voltage.

In addition, the second power amplifier may be configured with a decoupling capacitor, and when the second power amplifier is not working, the decoupling capacitor is disconnected.

Using the above solution, if the second power amplifier is configured with decoupling capacitors, when at least two or more second power amplifiers are connected to the second power supply voltage output terminal of the ETM, the decoupling capacitor configuration of the second power amplifier that is not working is disconnected .

In a possible design, at least one first power amplifier and at least one second power amplifier correspond to the same transmission channel of the transmitter.

With the above solution, one ETM can be used to supply power to PAs in different modes and different frequency bands in the same transmission channel.

In a second aspect, a transmitting device according to an embodiment of the present application includes: a transmitter for generating a radio frequency transmission signal and a corresponding envelope signal; an envelope tracking modulator for outputting the first power supply voltage or the first power supply voltage according to the envelope signal Two power supply voltages, the first power supply voltage is used to drive at least one first power amplifier in APT mode, and the second power supply voltage is used to drive at least one second power amplifier in ET mode; at least one first power amplifier is used in the first Power amplifies the radio frequency transmission signal under the power supply of the power supply voltage; at least one second power amplifier is used to power amplify the radio frequency transmission signal under the power supply of the second power supply voltage.

With the above solution, since the second power amplifier is sensitive to the load, the two-stage power supply mode can further reduce the load of the second power amplifier.

With the above solution, if the second power amplifier is configured with a decoupling capacitor, when the ETM is working in the ET mode, the decoupling capacitor of the second power amplifier that is not working can be disconnected, thereby reducing the load of the ETM.

In the transmitting device provided by the second aspect, the specific implementation manner of the envelope tracking modulator can be referred to the related description of the first aspect, which will not be repeated here.

Description of the drawings

Fig. 1 is a schematic diagram of the structure of an ET/APT power supply provided in the prior art;

FIG. 2 is a schematic structural diagram of the first ETM provided by an embodiment of this application;

FIG. 3 is a schematic structural diagram of a first transmitting device provided by an embodiment of this application;

FIG. 4 is a schematic structural diagram of a second ETM provided by an embodiment of this application;

FIG. 5 is a schematic structural diagram of a third ETM provided by an embodiment of this application;

FIG. 6 is a schematic diagram of a Vcc response time provided by an embodiment of the application;

FIG. 7 is a schematic structural diagram of a second type of launch device provided by an embodiment of this application;

FIG. 8 is a schematic structural diagram of a third transmitting device provided by an embodiment of this application.

Detailed ways

The following first introduces the application scenarios of the embodiments of the present application.

The integrated circuit provided by the embodiment of the application can be applied to a transmitting device. Among them, the transmitting device may be integrated in a wireless communication device, which may be a base station or a terminal.

Specifically, the transmitting device may include a transmitter, a power amplifier, and an envelope tracking modulator. The transmitter is used to output the RF transmission signal and envelope signal; the envelope tracking modulator is used to generate the PA power signal according to the envelope signal to supply power to the PA; the PA is used to perform the RF transmission signal output by the transmitter under the drive of the power signal The power is amplified and output.

Specifically, the transmitter may include multiple transmission channels, and each transmission channel may include multiple devices. Exemplarily, it may include a power amplifier (PA). In specific implementation, a transmission channel may include multiple PAs, and multiple PAs may work in different frequency bands or different modes. In addition, the transmission channel may also include other devices, such as phase shifters (PS), filters, antenna switches, mixers (MIX), digital-to-analog converters (DAC), modulators ( MOD), etc., the types of devices included in the transmission channel are not specifically limited in the embodiments of the present application.

In the embodiment of the present application, an envelope tracking modulator can be used to drive PAs in different frequency bands or different modes in the same transmission channel.

The embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

It should be noted that in the embodiments of the present application, multiple refers to two or more. In addition, it should be understood that in the description of this application, words such as "first" and "second" are only used for the purpose of distinguishing description, and cannot be understood as indicating or implying relative importance, nor can it be understood as indicating Or imply the order. The "coupling" mentioned in this application refers to electrical connection, which specifically may include direct connection or indirect connection. Below, the application scenarios of the embodiments of the present application are briefly introduced.

Specifically, as shown in FIG. 2, the envelope tracking modulator (ie ETM) provided by the embodiment of the present application includes: a single-input dual-output DC/DC converter 201, and the first of the single-input dual-output DC/DC converter 201 The output terminal is used to output a first power supply voltage, the second output terminal of the single-input dual-output DC/DC converter 201 is used to output a first direct current voltage, and the first power supply voltage is used to drive at least one first power amplifier in an APT mode; The single-input single-output DC/DC converter 202, the output terminal of the single-input single-output DC/DC converter 202 is used to output the second DC voltage; the linear amplifier (LA) 203 is used for the first DC voltage The envelope signal is amplified under power supply, and a first AC voltage is output. The second DC voltage and the first AC voltage form a second power supply voltage, and the second power supply voltage is used to drive at least one second power amplifier in an ET mode.

That is, in the embodiment of the present application, the ETM includes two DC/DC converters, and the output first power voltage of the single-input dual-output DC/DC converter 201 powers at least one first power amplifier in the APT mode.

In the ET mode, the single-input single-output DC/DC converter 202 performs DC/DC conversion on the first DC voltage output by the single-input dual-output DC/DC converter 201 (or directly outputs the input power pin of the ETM). After the battery voltage undergoes DC/DC conversion), the second DC voltage is output. The first DC voltage output by the single-input dual-output DC/DC converter 201 supplies power to the linear amplifier 203. The linear amplifier 203 amplifies the input envelope signal (from the transmitter) and outputs the first AC voltage, the second DC voltage and the first An AC voltage constitutes a second power supply voltage for driving at least one second power amplifier.

In practical applications, a linear amplifier can provide at least one second power amplifier with a first AC voltage through a capacitor, and a single-input single-output DC/DC converter can provide at least one second power amplifier with a second DC voltage through an inductor.

In FIG. 2, multiple PAs (that is, at least one first power amplifier and at least one second power amplifier) may be PAs in different frequency bands or in different modes. For example, it can be a PA in different frequency bands such as 3G/4G PA, 5G PA, 2G PA, or a PA in different modes such as ET PA or APT PA. At least one of the first power amplifiers can be regarded as APT PA, and at least one The second power amplifier can be regarded as ET PA.

Wherein, at least one first power amplifier and at least one second power amplifier correspond to the same transmitting channel of the transmitter. That is, at least one first power amplifier and at least one second power amplifier are driven by the radio frequency transmission signal output by the same transmission channel of the transmitter. That is to say, the radio frequency transmission signal amplified by the at least one first power amplifier and the at least one second power amplifier is formed after the same baseband circuit undergoes frequency conversion and amplification operations. According to different required modes and frequency bands, in at least one first power amplifier and at least one second power amplifier, only one power amplifier works at the same time.

In this embodiment of the application, for at least one first power amplifier and at least one second power amplifier, only one ETM can be used as a power source, and the APT PA (first power amplifier) and ETPA (second power amplifier) are separated at the output end of the ETM. Power amplifier), that is, to supply power to the ET PA and APT PA separately to achieve load isolation, improve the signal bandwidth and efficiency of the second power amplifier working in ET mode, and reduce the cost at the same time, which is compatible with powering the first power amplifier.

Exemplarily, the transmitting device including ETM provided by the embodiment of the present application may be as shown in FIG. 3. In the transmitting device shown in FIG. 3, PA1 and PA2 can be regarded as the second power amplifiers, and PA3, PA4, and PA5 can be regarded as the first power amplifiers. Among them, TRCV refers to a radio frequency transceiver (transceiver). LB 3G/4G Tx means the 3G/4G low-band (LB) transmission channel, HB 3G/4G Tx means the 3G/4G high-band (HB) transmission channel, UHB 5G Tx means the 5G ultra-high frequency band (ultra high band, UHB) transmission channel, 2G LB Tx means 2G low frequency transmission channel, 2G HB Tx means 2G high frequency transmission channel.

It should be noted that in the transmitting device shown in FIG. 3, only one PA is working at the same time. For example, when the transmission channels corresponding to PA1 to PA5 need to transmit 2G low-band radio frequency signals, PA4 works, ETM supplies power to PA4, and PA4 amplifies the power of the 2G low-band radio frequency transmission signal output by TRCV and outputs it.

In the embodiment of the present application, the single-input single-output DC/DC converter 202 may be powered by the input power pin of the ETM or by the first DC voltage output by the single-input dual-output DC/DC converter 201.

In addition, in the embodiment of the present application, the second power amplifier may include at least two stages of amplifiers, and the first stage of the at least two stages of amplifiers is powered by an independent power supply pin of the ETM (which may be a pin of a low dropout linear regulator or The output pin of the DC/DC converter is driven by the second power supply voltage. Wherein, the independent power supply pin refers to constructing a power supply voltage other than the first power supply voltage and the second power supply voltage to supply power to the first-stage amplifier. For example, the power supply voltage of the first-stage amplifier can be constructed by performing voltage conversion on the input power supply voltage of the ETM (such as a battery or system power supply).

Generally, PA can generally have two-stage or three-stage amplification, and the power supply current of the first-stage amplifier is generally small, so it can be driven by the LDO regulator pin of the ETM.

Exemplarily, a possible structural schematic diagram of the ETM provided in the embodiment of the present application may be as shown in FIG. 4. The ETM shown in Figure 4 can work in ET working mode or APT working mode. Vbat is the input power pin of ETM, and Vcc1 is the independent power pin of ETM, which is used to power the first-stage amplifier in ET PA. The Vcc1 terminal The output voltage is formed by the voltage conversion of the input power supply voltage of the ETM, and the differential input Vinp and Vinn can be regarded as the envelope signal output by the transmitter. Among them, the dual-output Buck-boost converter (a specific example of the single-input dual-output DC/DC converter 201) can choose to output power to the linear amplifier (ET working mode), or choose to output to the external APT PA power supply (APT Operating mode). In the ET working mode, the linear amplifier provides the first AC voltage to the ET PA through C1. In addition, there is another independent buck converter (a specific example of the single-input single-output DC/DC converter 202), which provides ET PA provides the second DC voltage.

In the ETM shown in Figure 4, the APT PA is completely isolated from the VCC of the ET PA. In the ET operating mode, the ETM only sees the load capacitance of the ET PA, which can effectively improve the efficiency of the ET PA and the work of the ET PA bandwidth. In the printed circuit board (PCB) layout, the ETM can be placed as close to the ET PA as possible to reduce the parasitic of the ET PA wiring. In addition, in the ETM shown in FIG. 4, further, in order to reduce the load of ET PA, VCC1 can be independently powered.

In a possible example, the ETM may further include: a first switch unit, two ends of the first switch unit are respectively coupled to the input power pin of the ETM and the first output end of the single-input dual-output DC/DC converter 201 , Used to close in the first time period after the envelope tracking modulator is started; the second switch unit, both ends of the second switch unit are connected to the ground pin of the ETM and the single-input dual-output DC/DC converter 201 The first output terminal is coupled for closing in a second time period after the envelope tracking modulator is powered off.

That is to say, the first switch unit and the second switch unit can be provided in the ETM for the APT PA. When the ETM is used as the APT power supply, the voltage response time of the APT PA can be reduced.

At the APT output port of the ETM, the capacitive load is relatively large. When the load is charged and discharged through the DC/DC converter in the ETM, the voltage stabilization time will be relatively long, especially for larger bandwidth PAs, such as FR1 (sub6GHz) CA> = 200MHz bandwidth, or FR2 (mmWave band) 400M/800M PA Array. When this type of PA is connected to the APT output port, the power supply voltage is required to achieve fast charge and discharge response and achieve fast voltage establishment. Therefore, in order to reduce the voltage response time, the above-mentioned first switch unit and the second switch unit may be provided. When charging the load (that is, when increasing the output power of the power amplifier), the first switch unit is closed in the first time period, and the load can be charged directly through the input power pin of the ETM, thereby reducing the voltage response time; When discharging the load (that is, when reducing the output power of the power amplifier), the second switch unit is closed in the second time period. At this time, the load can be discharged directly through the ground pin of the ETM, thereby reducing the voltage response time.

Exemplarily, for the ETM shown in FIG. 4, if the above-mentioned first switch unit and the second switch unit are provided, the schematic diagram of the structure of the ETM may be as shown in FIG. 5. Among them, S2 can be regarded as the first switch unit, and S3 can be regarded as the second switch unit. S2 and S3 can also be called a set of bybass switches. When Vcc is established, S2 is turned on for a short time (the turn-on time can be configured by the baseband chip or TRCV chip through the data interface to control the ETM), and Vbat is directly charged to the Vcc node. When Vcc is turned off, S3 is turned on for a short time (the on time can be configured by the baseband chip or TRCV chip through the data interface to control the ETM), and the charge on the Vcc node is directly discharged to the ground. In the case that the bybass switch and the bybass switch are not set in the ETM, the Vcc response time can be shown in Figure 6. It can be seen from Figure 6 that when Vcc is established, S2 is turned on for a short time, and the response time of Vcc is reduced compared with when S2 is not set; when Vcc is turned off, S3 is turned on for a short time, and the response time of Vcc is different from that of not set. Compared with S3, it is reduced.

In addition, in the embodiment of the present application, the second power amplifier may be configured with a decoupling capacitor, and when the second power amplifier is not working, the decoupling capacitor is disconnected.

Exemplarily, for the transmitting device shown in FIG. 3, if the second power amplifier is configured with a decoupling capacitor, it may be as shown in FIG. 7.

With the above solution, if the second power amplifier is configured with a decoupling capacitor, when the ETM is working in the ET mode, the decoupling capacitor of the second power amplifier that is not working can be disconnected, thereby reducing the load of the ETM. For example, if a large-bandwidth PA is connected to the ET output port of the ETM, if the ET PA is equipped with decoupling capacitors, the decoupling capacitors of other ET PAs can be disconnected, thereby reducing the load of the ETM (that is, reducing the ET output). Load on the Vcc trace of the PA). In addition, if the ET PA is not equipped with a decoupling capacitor, the 5G large bandwidth PA can be connected to the APT output port of the ETM.

In practical applications, the second power amplifier in the embodiment of the present application can work in the 3G frequency band or the 4G frequency band; the first power amplifier can work in the 2G frequency band or the 5G frequency band. Of course, the working frequency bands of the first power amplifier and the second power range are not specifically limited in the embodiments of the present application. Illustratively, the second power amplifier may also work in the 5G frequency band, if the second power amplifier is working in the 5G frequency band. , Then the second power amplifier can be configured with a decoupling capacitor.

In summary, using the envelope tracking modulator provided in the embodiment of the present application, for at least one first power amplifier and at least one second power amplifier, only one ETM can be used as a power source, and the APT PA (the first power amplifier) is separated at the output of the ETM. One power amplifier) and ET PA (second power amplifier), that is, to drive ET PA and APT PA separately, so as to realize load isolation and reduce the influence between different types of power amplifiers.

Based on the same inventive concept, an embodiment of the present application also provides a transmitting device. Referring to FIG. 8, the transmitting device includes a transmitter, an envelope tracking modulator, at least one first power amplifier, and at least one second power amplifier.

Among them, the transmitter is used to generate the radio frequency transmission signal and the corresponding envelope signal; the envelope tracking modulator is used to output the first power supply voltage or the second power supply voltage according to the envelope signal, and the first power supply voltage is used to adopt the APT mode Driving at least one first power amplifier, and the second power supply voltage is used to drive at least one second power amplifier in an ET mode; at least one first power amplifier is used to power amplify the radio frequency transmission signal under the power of the first power supply voltage; At least one second power amplifier is used for power amplifying the radio frequency transmission signal under the power of the second power supply voltage.

Optionally, the second power amplifier includes at least two stages of amplifiers, the first stage of the at least two stages of amplifiers is driven by an independent power supply pin of the envelope tracking modulator, and the subsequent stage of the at least two stages of amplifiers is driven by the second Power supply voltage drive.

Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present application without departing from the scope of the embodiments of the present application. In this way, if these modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these modifications and variations.

Claims

An envelope tracking modulator, characterized in that it comprises:

A single-input dual-output DC/DC converter, the first output terminal of the single-input dual-output DC/DC converter is used to output a first power supply voltage, and the second output of the single-input dual-output DC/DC converter The terminal is used to output a first DC voltage, and the first power supply voltage is used to drive at least one first power amplifier in an average power tracking APT mode;

A single-input single-output DC/DC converter, where the output terminal of the single-input single-output DC/DC converter is used to output a second direct current voltage;

The linear amplifier is used to amplify the envelope signal under the power supply of the first direct current voltage and output a first alternating current voltage. The second direct current voltage and the first alternating current voltage form a second power supply voltage. The second power supply voltage is used to drive at least one second power amplifier in an envelope tracking ET mode.
The envelope tracking modulator of claim 1, wherein the single-input single-output DC/DC converter is powered by the input power pin of the envelope tracking modulator or is supplied by the first DC voltage powered by.
3. The envelope tracking modulator of claim 2, wherein the envelope tracking modulator further comprises:

The first switch unit, both ends of the first switch unit are respectively coupled with the input power pin of the envelope tracking modulator and the first output terminal of the single-input dual-output DC/DC converter for The envelope tracking modulator is closed within the first time period after the start of the envelope tracking modulator;

The second switch unit, both ends of the second switch unit are respectively coupled with the ground pin of the envelope tracking modulator and the first output terminal of the single-input dual-output DC/DC converter for The envelope tracking modulator is closed in the second time period after the power is off.
The envelope tracking modulator according to any one of claims 1 to 3, wherein the at least one first power amplifier works in the 2G frequency band or the 5G frequency band, and the at least one second power amplifier works in the 3G frequency band Or 4G frequency band.
The envelope tracking modulator according to any one of claims 1 to 4, wherein the at least one first power amplifier and the at least one second power amplifier correspond to the same transmission channel of the transmitter.
A launching device, characterized in that it comprises:

Transmitter, used to generate radio frequency transmission signal and corresponding envelope signal;

The envelope tracking modulator is used to output a first power supply voltage or a second power supply voltage according to the envelope signal, the first power supply voltage is used to drive at least one first power amplifier in an APT mode, and the second power supply voltage For driving at least one second power amplifier in an ET mode;

The at least one first power amplifier is configured to amplify the power of the radio frequency transmission signal under the power supply of the first power supply voltage;

The at least one second power amplifier is configured to amplify the power of the radio frequency transmission signal under the power supply of the second power supply voltage.
The transmitting device according to claim 6, wherein the second power amplifier includes at least two stages of amplifiers, and the first stage of the at least two stages of amplifiers is powered by an independent power supply of the envelope tracking modulator. The pin is driven, and the latter amplifier in the at least two-stage amplifier is driven by the second power supply voltage.
7. The transmitting device of claim 6 or 7, wherein the second power amplifier is configured with a decoupling capacitor, and the decoupling capacitor is disconnected when the second power amplifier is not working.