Doherty power amplifier circuit and electronic device

Abstract

The application provides a Doherty power amplifier circuit and an electronic device. The Doherty power amplifier circuit comprises a decoupler, a first amplifier, a second amplifier and an adjusting unit. An input end of the first amplifier is electrically connected with a first output end of the decoupler, and an output end of the first amplifier is used for being electrically connected with a load. An input end of the adjusting unit is electrically connected with an input end of the first amplifier, an output end of the adjusting unit is electrically connected with an output end of the first amplifier, and the adjusting unit is used for switching a working state of the first amplifier from a saturation state to a linear state. Thus, the problem that an efficiency curve of the Doherty power amplifier circuit in the prior art is prone to concave is alleviated, and when the first amplifier also enters the saturation state, the adjusting unit timely stops assisting the first amplifier to work, so that the efficiency at this time is avoided from being affected.

Description

Technical Field

[0001] This application relates to the field of Doherty power amplifier circuit technology, and more specifically, to a Doherty power amplifier circuit and electronic device. Background Technology

[0002] Since base station power amplifiers often operate in backoff mode, techniques to enhance power amplifier efficiency in backoff mode are crucial. The Doherty architecture has proven to be an important technology for achieving high-efficiency, linearized base station power amplifiers.

[0003] An ideal two-way symmetrical Doherty architecture consists of two power transistors of equal size. One is called the carrier power amplifier, which operates in Class-AB state and is always on; the other is called the peak power amplifier, which operates in Class-C state and gradually turns on as the input power increases.

[0004] The efficiency of the two-channel symmetrical Doherty amplifier has two peaks: one when both tubes are saturated, i.e. when the output power is at maximum; and the other when the peak amplifier is about to turn on, i.e. when it is backed down by 6dB.

[0005] In reality, power amplifier transistors cannot always maintain a linear increase in power with the input. This nonlinearity becomes more pronounced as they approach saturation, meaning they transition from a linear state to saturation. The Doherty architecture, however, is designed based on an ideal linear model, requiring strict current matching between the carrier amplifier and the peak amplifier. Because the carrier amplifier turns on before the peak amplifier, it also enters saturation earlier. At this point, due to the current mismatch between the carrier and peak amplifiers, the actual Doherty amplifier's efficiency is lower than the theoretical value. However, as the input power increases further, the peak amplifier also enters saturation, the current ratio between the carrier and peak amplifiers returns to the design value, and the Doherty amplifier's efficiency returns to the theoretical value. Summary of the Invention

[0006] The main objective of this application is to provide a Doherty power amplifier circuit and electronic device to reduce the problem that the efficiency curve of the existing Doherty power amplifier circuit is prone to dips.

[0007] According to one aspect of the present invention, a Doherty power amplifier circuit is provided. The Doherty power amplifier circuit includes a decoupler, a first amplifier, a second amplifier, and an adjustment unit. The decoupler has an input terminal, a first output terminal, and a second output terminal. The input terminal of the decoupler is used to receive an input signal, and the decoupler is used to couple the input signal. The first amplifier has an input terminal and an output terminal. The input terminal of the first amplifier is electrically connected to the first output terminal of the decoupler, and the output terminal of the first amplifier is used to be electrically connected to a load. The second amplifier has an input terminal and an output terminal. The input terminal of the second amplifier is electrically connected to the second output terminal of the decoupler, and the output terminal of the second amplifier is electrically connected to the output terminal of the first amplifier. The adjustment unit has an input terminal and an output terminal. The input terminal of the adjustment unit is electrically connected to the input terminal of the first amplifier, and the output terminal of the adjustment unit is electrically connected to the output terminal of the first amplifier. The adjustment unit is used to switch the operating state of the first amplifier from a saturation state to a linear state.

[0008] Optionally, the adjustment unit includes a third amplifier, a first switch module, a second switch module, and a switch control module; the input terminal of the third amplifier is electrically connected to the first terminal of the first switch module, the output terminal of the third amplifier is electrically connected to the first terminal of the second switch module, the second terminal of the first switch module serves as the input terminal of the adjustment unit, the second terminal of the second switch module serves as the output terminal of the adjustment unit, the input terminal of the switch control module is used to receive switch control signals, and the output terminal of the switch control module is electrically connected to the control terminals of the first switch module and the second switch module, respectively.

[0009] Optionally, the switch control module includes a first diode, a second diode, a first resistor module, a second resistor module, an inverter, and an AND gate. The anode of the first diode is electrically connected to the anode of the second diode, and the anode of the first diode serves as the input terminal of the switch control module. The cathode of the first diode is electrically connected to the first terminal of the first resistor module and the first input terminal of the AND gate, respectively. The cathode of the second diode is electrically connected to the first terminal of the second resistor module and the input terminal of the inverter, respectively. The output terminal of the inverter is electrically connected to the second input terminal of the AND gate, and the output terminal of the AND gate serves as the output terminal of the switch control module. The second terminals of the first resistor module and the second terminals of the second resistor module are grounded.

[0010] Optionally, the adjustment unit includes a third amplifier, a first switch module, and a switch control module; the input terminal of the third amplifier is electrically connected to the first terminal of the first switch module, the output terminal of the third amplifier serves as the output terminal of the adjustment unit, the second terminal of the first switch module serves as the input terminal of the adjustment unit, the input terminal of the switch control module is used to receive switch control signals, and the output terminal of the switch control module is electrically connected to the control terminals of the first switch module and the second switch module, respectively.

[0011] Optionally, the adjustment unit includes a third amplifier, a second switch module, and a switch control module; the input terminal of the third amplifier serves as the input terminal of the adjustment unit, the output terminal of the third amplifier is connected to the first terminal of the second switch module, the second terminal of the first switch module serves as the input terminal of the adjustment unit, the input terminal of the switch control module is used to receive switch control signals, and the output terminal of the switch control module is electrically connected to the control terminal of the second switch module.

[0012] Optionally, the Doherty power amplifier circuit further includes a matching resistor, the isolation terminal of the decoupler is electrically connected to the first terminal of the matching resistor, and the second terminal of the matching resistor is grounded.

[0013] Optionally, both the first switch module and the second switch module are semiconductor power switching devices.

[0014] Optionally, the output terminals of the first amplifier and the second amplifier are electrically connected via a 1 / 4 wavelength transmission line.

[0015] According to another aspect of the present invention, an electronic device is also provided, which includes any of the Doherty power amplifier circuits described above.

[0016] In this embodiment of the invention, the adjustment unit is used to switch the operating state of the first amplifier from saturation to linearity, thereby alleviating the problem that the efficiency curve of the Doherty power amplifier circuit in the prior art is prone to dips. When the first amplifier also enters saturation, the adjustment unit stops assisting the first amplifier in working in time to avoid affecting the efficiency at this time. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0018] Figure 1 A schematic diagram of a Doherty power amplifier circuit according to an embodiment of this application is shown;

[0019] Figure 2 A schematic diagram of a switch control module according to an embodiment of this application is shown;

[0020] Figure 3 A schematic diagram of the ideal Doherty current curve is shown;

[0021] Figure 4 A schematic diagram of the ideal Doherty voltage curve is shown;

[0022] Figure 5 A schematic diagram of the ideal Doherty efficiency curve is shown;

[0023] Figure 6 A schematic diagram of a real Doherty current curve is shown;

[0024] Figure 7 A schematic diagram of the actual Doherty voltage curve is shown;

[0025] Figure 8 A schematic diagram comparing ideal and real efficiency curves is shown;

[0026] Figure 9 A schematic diagram of the Doherty current curve of this application is shown;

[0027] Figure 10 A schematic diagram of the Doherty voltage curve of this application is shown;

[0028] Figure 11 A schematic diagram of the Doherty efficiency curve of this application is shown.

[0029] The above figures include the following reference numerals:

[0030] 100. Adjustment unit; 110. Switch control module. Detailed Implementation

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0033] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0034] It should be understood that when an element (such as a layer, film, region, or substrate) is described as being "on" another element, the element may be directly on the other element, or there may be an intermediate element present. Furthermore, in the specification and claims, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element, or "connected" to the other element via a third element.

[0035] As mentioned in the background section, real-world power amplifier transistors cannot always maintain a linear increase in power with the input. This nonlinearity becomes more pronounced as they approach saturation, meaning they transition from a linear state to a saturation state. The Doherty architecture is designed based on an ideal linear model, requiring strict current matching between the carrier amplifier and the peak amplifier. Because the carrier amplifier turns on before the peak amplifier, it also enters saturation earlier. At this point, due to the current mismatch between the carrier and peak amplifiers, the actual Doherty amplifier's efficiency is lower than the theoretical value. However, as the input power further increases, the peak amplifier also enters saturation, the current ratio between the carrier and peak amplifiers returns to the design value, and the Doherty amplifier's efficiency returns to the theoretical value. To mitigate the problem of the efficiency curve of existing Doherty amplifier circuits easily becoming concave, this application provides a typical embodiment of a Doherty amplifier circuit and electronic device.

[0036] According to embodiments of this application, a Doherty power amplifier circuit is provided, such as... Figure 1As shown, the Doherty power amplifier circuit includes a decoupler U1, a first amplifier Q1, a second amplifier Q2, and an adjustment unit 100. The decoupler U1 has an input terminal, a first output terminal, and a second output terminal. The input terminal of the decoupler U1 is used to receive an input signal, and the decoupler U1 is used to couple the input signal to obtain a first output signal and a second output signal. The first amplifier Q1 has an input terminal and an output terminal. The input terminal of the first amplifier Q1 is electrically connected to the first output terminal of the decoupler U1, and the output terminal of the first amplifier Q1 is used to be electrically connected to the load. The second amplifier Q2 has an input terminal and an output terminal. The input terminal of the second amplifier Q2 is electrically connected to the second output terminal of the decoupler U1, and the output terminal of the second amplifier Q2 is electrically connected to the output terminal of the first amplifier Q1. The adjustment unit 100 has an input terminal and an output terminal. The input terminal of the adjustment unit 100 is electrically connected to the input terminal of the first amplifier Q1, and the output terminal of the adjustment unit 100 is electrically connected to the output terminal of the first amplifier Q1. The adjustment unit 100 is used to switch the operating state of the first amplifier Q1 from a saturated state to a linear state.

[0037] In the Doherty power amplifier circuit described above, the adjustment unit is used to switch the operating state of the first amplifier from saturation to linearity, thereby alleviating the problem that the efficiency curve of the Doherty power amplifier circuit in the existing solution is prone to dips. When the first amplifier also enters saturation, the adjustment unit stops assisting the first amplifier in time to avoid affecting the efficiency at this time.

[0038] In one embodiment of this application, such as Figure 1 As shown, the adjustment unit 100 includes a third amplifier Q3, a first switch module K1, a second switch module K2, and a switch control module 110. The input terminal of the third amplifier Q3 is electrically connected to the first terminal of the first switch module K1, and the output terminal of the third amplifier Q3 is electrically connected to the first terminal of the second switch module K2. The second terminal of the first switch module K1 serves as the input terminal of the adjustment unit 100, and the second terminal of the second switch module K2 serves as the output terminal of the adjustment unit 100. The input terminal of the switch control module 110 is used to receive switch control signals, and the output terminal of the switch control module 110 is electrically connected to the control terminals of the first switch module K1 and the second switch module K2, respectively.

[0039] The third amplifier can adjust its power according to the power of the first amplifier. When the first switching module is turned on, the third amplifier assists the first amplifier in working, and it does not work when the first switching module is turned off. In order to reduce the parasitic effect of the third amplifier on the first amplifier, a control switch is also added to its output terminal, that is, a second switching module is added.

[0040] In one embodiment of this application, such as Figure 2 As shown, the switch control module 110 includes a first diode Vth1, a second diode Vth2, a first resistor module R1, a second resistor module R2, an inverter Q4, and an AND gate Q5. The anode of the first diode Vth1 is electrically connected to the anode of the second diode Vth2, and the anode of the first diode Vth1 serves as the input terminal of the switch control module 110. The cathode of the first diode Vth1 is electrically connected to the first terminal of the first resistor module R1 and the first input terminal of the AND gate Q5. The cathode of the second diode Vth2 is electrically connected to the first terminal of the second resistor module R2 and the input terminal of the inverter Q4. The output terminal of the inverter Q4 is electrically connected to the second input terminal of the AND gate Q5, and the output terminal of the AND gate Q5 serves as the output terminal of the switch control module 110. The second terminals of the first resistor module R1 and the second resistor module R2 are grounded.

[0041] The truth tables for the first diode Vth1 and the second diode Vth2 are shown in the table below:

[0042] Truth tables for Vth1 and Vth2

[0043]

[0044]

[0045] In one embodiment of this application, the adjustment unit includes a third amplifier, a first switching module, and a switch control module; the input terminal of the third amplifier is electrically connected to the first terminal of the first switching module, the output terminal of the third amplifier serves as the output terminal of the adjustment unit, the second terminal of the first switching module serves as the input terminal of the adjustment unit, the input terminal of the switch control module is used to receive a switch control signal, and the output terminal of the switch control module is electrically connected to the control terminals of the first switching module and the second switching module, respectively.

[0046] In one embodiment of this application, the adjustment unit includes a third amplifier, a second switch module, and a switch control module; the input terminal of the third amplifier serves as the input terminal of the adjustment unit, the output terminal of the third amplifier is connected to the first terminal of the second switch module, the second terminal of the first switch module serves as the input terminal of the adjustment unit, the input terminal of the switch control module is used to receive switch control signals, and the output terminal of the switch control module is electrically connected to the control terminal of the second switch module.

[0047] The switching module and the switching control module enable the third amplifier to assist the first amplifier when needed.

[0048] In one embodiment of this application, such as Figure 1 As shown, the Doherty power amplifier circuit also includes a matching resistor R3. The isolation terminal of the decoupler U1 is electrically connected to the first terminal of the matching resistor R3, and the second terminal of the matching resistor R3 is grounded.

[0049] The isolation terminal of the decoupler is connected to the matching resistor R3 so that the power at the input terminal of the decoupler can be correctly distributed to the first output terminal and the second output terminal of the decoupler.

[0050] In one embodiment of this application, both the first switch module and the second switch module are semiconductor power switching devices.

[0051] In one embodiment of this application, such as Figure 1 As shown, Figure 1 RL represents the load. The output terminals of the first amplifier and the second amplifier are electrically connected via a quarter-wavelength transmission line Lth. Impedance transformation is achieved through this quarter-wavelength transmission line, ensuring that the load impedance of the Doherty power amplifier is greater when the first amplifier operates alone (low power mode) than when both amplifiers operate together (high power mode), thus achieving higher efficiency even at low power operation.

[0052] According to another aspect of the present invention, an electronic device is also provided, which includes any of the above-described Doherty power amplifier circuits.

[0053] In a communication system, the input signal of a base station comes from the digital signal provided by the baseband unit, which is converted into an analog signal by a digital-to-analog converter (DAC). After a series of filtering and frequency conversion processes, it is converted into an RF signal that can be received by an RF power amplifier. The RF power amplifier amplifies the RF signal and transmits it through an antenna.

[0054] High-end system manufacturers build their systems starting from the baseband unit, thus possessing a certain level of digital signal processing capabilities. Using this application, the desired switching control can be achieved with just a simple digital comparator. Similar functional modules are mature and will not be elaborated upon further.

[0055] Most integrated manufacturers in the market start building systems from digital-to-analog converters and do not have the ability to process digital signals, so they need to start from analog signals. The present invention designs an analog input switch control for such users. The turn-on voltages of the two diodes are Vth1 and Vth2 respectively. According to the diode characteristics, when the input signal Vin < Vth1, the switch is closed; when Vth1 < Vin < Vth2, the switch is turned on; when Vin > Vth2, the switch is closed. Therefore, the function of stage-by-stage turning on of the input signal is realized. And as long as a suitable input coupling is selected, such that Vin = Vth1 corresponds to the carrier power amplifier approaching the saturation state, and Vin = Vth2 corresponds to the peak power amplifier approaching the saturation state.

[0056] As Figure 3 shown, the ideal Doherty precisely designs the current ratio of the carrier power amplifier and the peak power amplifier through strict calculations. When the carrier power amplifier works alone, its voltage increases linearly with the current; when the voltage reaches the peak, the efficiency also reaches the first peak; at this time, the peak power amplifier is turned on. According to the 1:1 Doherty circuit structure, at this time, the voltage of the carrier power amplifier Vc = (2×Ic - Ip)×R0, where Ic and Ip are the currents of the carrier power amplifier and the peak power amplifier respectively, and both increase linearly with the input voltage. Therefore, when the rate of change of the peak power amplifier current with respect to the input voltage (i.e., the transconductance of the power amplifier Ip / Vin) is designed to be twice that of the carrier power amplifier, the voltage Vc of the carrier power amplifier will remain constant, that is, the carrier power amplifier always maintains the peak efficiency state. Because at this time the voltage of the peak power amplifier has not reached the peak, the efficiency of the peak power amplifier is at a low point. As the peak power amplifier gradually turns on, its proportion in Doherty becomes heavier and heavier. Therefore, the overall efficiency of Doherty will decrease as the peak power amplifier turns on after the carrier power amplifier reaches the first peak; and when the peak power amplifier current increases to saturation, its voltage and efficiency also reach the peak, and at this time the Doherty efficiency reaches the second peak.

[0057] As Figure 4 and Figure 5 shown, as described above, the ideal Doherty requires the currents of the carrier power amplifier and the peak power amplifier to strictly meet the design values. However, in reality, the power amplifier will not always increase linearly due to saturation. Therefore, although the carrier power amplifier and the peak power amplifier finally enter saturation and can still return to the correct current ratio, because the carrier power amplifier turns on before the peak power amplifier, when it enters saturation first, it cannot meet the current ratio with the peak power amplifier, resulting in the voltage of the carrier power amplifier not always remaining at the peak, and the Doherty efficiency also shows a depression at this time.

[0058] As Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 and Figure 11As shown, this application aims to address the aforementioned deficiencies by adding a control switch and a low-power amplifier to the carrier power amplifier link. The control switch is normally closed, and the low-power amplifier does not participate in operation. When the carrier power amplifier approaches saturation, the switch opens, and the low-power amplifier is introduced into the link, effectively operating in parallel with the carrier power amplifier. Due to the assistance of the low-power amplifier, the carrier power amplifier's entry into saturation is delayed. As the input voltage further increases, the peak power amplifier approaches saturation. At this point, the control switch closes, the low-power amplifier is disconnected from the link, and both the carrier power amplifier and the peak power amplifier enter saturation simultaneously. The current ratio between the two still meets the design value, thus ensuring that the carrier power amplifier voltage is always maintained at its peak, solving the Doherty efficiency dip problem.

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

[0060] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0061] As can be seen from the above description, the embodiments of this application achieve the following technical effects:

[0062] 1) The Doherty power amplifier circuit of this application uses an adjustment unit to switch the operating state of the first amplifier from saturation to linearity, thereby alleviating the problem that the efficiency curve of the Doherty power amplifier circuit in the prior art is prone to dips. When the first amplifier also enters saturation, the adjustment unit stops assisting the first amplifier in working in time to avoid affecting the efficiency at this time.

[0063] 2) The electronic device of this application uses an adjustment unit to switch the operating state of the first amplifier from saturation to linearity, thereby alleviating the problem that the efficiency curve of the Doherty power amplifier circuit in the prior art is prone to dips. When the first amplifier also enters saturation, the adjustment unit stops assisting the first amplifier in working in time to avoid affecting the efficiency at this time.

[0064] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A Doherty power amplifier circuit, characterized in that, include: A decoupler has an input terminal, a first output terminal, and a second output terminal. The input terminal of the decoupler is used to receive an input signal, and the decoupler is used to couple the input signal. A first amplifier has an input terminal and an output terminal. The input terminal of the first amplifier is electrically connected to the first output terminal of the decoupler, and the output terminal of the first amplifier is used for electrical connection with a load. The second amplifier has an input terminal and an output terminal. The input terminal of the second amplifier is electrically connected to the second output terminal of the decoupler, and the output terminal of the second amplifier is electrically connected to the output terminal of the first amplifier. The adjustment unit has an input terminal and an output terminal. The input terminal of the adjustment unit is electrically connected to the input terminal of the first amplifier, and the output terminal of the adjustment unit is electrically connected to the output terminal of the first amplifier. The adjustment unit only operates when the second amplifier is not in a saturated state but the first amplifier has entered the saturated state, so that the operating state of the first amplifier switches from the saturated state to the linear state. When the second amplifier also enters the saturated state, the adjustment unit promptly stops assisting the first amplifier.

2. The Doherty power amplifier circuit according to claim 1, characterized in that, The adjustment unit includes a third amplifier, a first switch module, a second switch module, and a switch control module. The input terminal of the third amplifier is electrically connected to the first terminal of the first switch module, and the output terminal of the third amplifier is electrically connected to the first terminal of the second switch module. The second terminal of the first switch module serves as the input terminal of the adjustment unit, and the second terminal of the second switch module serves as the output terminal of the adjustment unit. The input terminal of the switch control module is used to receive switch control signals, and the output terminal of the switch control module is electrically connected to the control terminals of the first switch module and the second switch module, respectively.

3. The Doherty power amplifier circuit according to claim 2, characterized in that, The switch control module includes a first diode, a second diode, a first resistor module, a second resistor module, an inverter, and an AND gate. The anode of the first diode is electrically connected to the anode of the second diode, serving as the input terminal of the switch control module. The cathode of the first diode is electrically connected to the first terminal of the first resistor module and the first input terminal of the AND gate, respectively. The cathode of the second diode is electrically connected to the first terminal of the second resistor module and the input terminal of the inverter, respectively. The output terminal of the inverter is electrically connected to the second input terminal of the AND gate, serving as the output terminal of the switch control module. The second terminals of the first and second resistor modules are grounded.

4. The Doherty power amplifier circuit according to claim 2, characterized in that, The adjustment unit includes a third amplifier, a first switch module, and a switch control module; the input terminal of the third amplifier is electrically connected to the first terminal of the first switch module, the output terminal of the third amplifier serves as the output terminal of the adjustment unit, the second terminal of the first switch module serves as the input terminal of the adjustment unit, the input terminal of the switch control module is used to receive switch control signals, and the output terminal of the switch control module is electrically connected to the control terminals of the first switch module and the second switch module, respectively.

5. The Doherty power amplifier circuit according to claim 2, characterized in that, The adjustment unit includes a third amplifier, a second switch module, and a switch control module; the input terminal of the third amplifier serves as the input terminal of the adjustment unit, the output terminal of the third amplifier is connected to the first terminal of the second switch module, the second terminal of the first switch module serves as the input terminal of the adjustment unit, the input terminal of the switch control module is used to receive switch control signals, and the output terminal of the switch control module is electrically connected to the control terminal of the second switch module.

6. The Doherty power amplifier circuit according to claim 1, characterized in that, The Doherty power amplifier circuit also includes a matching resistor. The isolation terminal of the decoupler is electrically connected to the first terminal of the matching resistor, and the second terminal of the matching resistor is grounded.

7. The Doherty power amplifier circuit according to claim 2 or 3, characterized in that, Both the first switch module and the second switch module are semiconductor power switching devices.

8. The Doherty power amplifier circuit according to any one of claims 1 to 6, characterized in that, The output terminals of the first amplifier and the second amplifier are electrically connected via a 1 / 4 wavelength transmission line.

9. An electronic device, characterized in that, The Doherty power amplifier circuit includes any one of claims 1 to 8.

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