AC voltage stacked power amplifier

Abstract

The present invention provides an AC voltage stacked power amplifier, which includes a signal input terminal, an input matching network, a driver amplifier, an interstage matching network, an AC voltage stacking circuit, an output matching network, a signal output terminal, and a bias circuit connected in sequence, the base of a first transistor is connected to the output terminal of the interstage matching network as a first input terminal, the collector of the first transistor is respectively connected to the first end of a first capacitor and the first end of a first inductor, the second end of the first inductor is connected to a second DC power supply voltage as a second input terminal, the second end of the first capacitor is respectively connected to the first end of the second inductor and the emitter of the second transistor, the base of the second transistor is connected to the output terminal of the bias circuit as a third input terminal, and the collector of the second transistor is respectively used to connect the second DC power supply voltage and the output terminal of the AC voltage stacking circuit as a fourth input terminal. The AC voltage stacked power amplifier of the present invention can achieve an increase in saturation power and gain.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technology, and in particular to an alternating current voltage stacked power amplifier. Background Art

[0002] As humans enter the information age, wireless communication technology has developed rapidly. From mobile phones, wireless LANs, Bluetooth, etc., it has become an indispensable part of social life and development. The advancement of wireless communication technology is inseparable from the development of RF circuits. With the development and evolution of modern wireless communication systems, the requirements for data transmission rate and capacity are getting higher and higher. Specifically, the 5GNR standard is more stringent than the 4G LTE standard, and the required bandwidth of the modulated signal is wider, which requires higher linearity of the RF power amplifier. Generally speaking, the RF power amplifier can achieve higher linearity requirements by increasing the saturation power.

[0003] Several existing technologies can improve the saturation power of power amplifiers. For example, the output power of a single power amplifier is proportional to Vcc^2 / RL, where Vcc represents the power supply voltage and RL represents the load impedance. The solution is to increase the power supply voltage and reduce the load impedance. However, for mobile phone terminals, considering the limited power supply voltage and the efficiency of the DC-DC converter, it is not advisable to increase the power supply voltage. Therefore, the load impedance of the single-ended power amplifier is relatively low to meet the high power requirements, which causes the matching network to tend to be narrow-band and excessive loss. However, for parallel combination, differential, cascode and other methods, it is necessary to increase the power supply voltage or reduce the load impedance to simultaneously increase the saturation power and gain.

[0004] Therefore, the AC voltage stacked power amplifier has poor saturation power and gain improvement effects, low reliability, and a small application range. Summary of the invention

[0005] In view of the above deficiencies in the prior art, the present invention proposes an AC voltage stacked power amplifier to solve the problems of poor saturation power and gain improvement effects, low reliability and small application range of the existing AC voltage stacked power amplifier.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] An embodiment of the present invention provides an AC voltage stacked power amplifier, which includes a signal input terminal, an input matching network, a driver stage amplifier, an inter-stage matching network, an AC voltage stacking circuit, an output matching network, a signal output terminal, and a bias circuit for providing a bias voltage for the AC voltage stacking circuit, which are connected in sequence, wherein the input terminal of the bias circuit is used to connect to a power supply voltage, the output terminal of the bias circuit is connected to the input terminal of the AC voltage stacking circuit, and the output terminal of the AC voltage stacking circuit is connected to the output matching network, and is characterized in that the base of the driver stage amplifier is connected to the input matching network, the emitter of the driver stage amplifier is grounded, the collector of the driver stage amplifier is respectively connected to a first DC power supply voltage and the input terminal of the inter-stage matching network, and the output terminal of the inter-stage matching network is connected to the input terminal of the AC voltage stacking circuit;

[0008] The AC voltage stacking circuit includes a first transistor, a second transistor, a first inductor, a second inductor and a first capacitor, and the input end of the AC voltage stacking circuit includes a first input end, a second input end, a third input end and a fourth input end;

[0009] The base of the first transistor is connected to the output end of the inter-stage matching network as the first input end, the emitter of the first transistor is grounded, and the collector of the first transistor is respectively connected to the first end of the first capacitor and the first end of the first inductor; the second end of the first inductor is connected to the second DC power supply voltage as the second input end, the second end of the first capacitor is respectively connected to the first end of the second inductor and the emitter of the second transistor, and the second end of the second inductor is grounded;

[0010] The base of the second transistor is connected to the output end of the bias circuit as the third input end, and the collector of the second transistor is connected to the output end of the AC voltage stacking circuit and is also used to connect to the third DC power supply voltage.

[0011] Preferably, the AC voltage stacked power amplifier further includes a third inductor, and the collector of the second transistor is connected to the third DC power supply voltage after being connected in series with the third inductor.

[0012] Preferably, the AC voltage stacked power amplifier also includes a bias matching circuit, a first end of the bias matching circuit is connected to the base of the second transistor, a second end of the bias matching circuit is connected to the output end of the bias circuit, and a third end of the bias matching circuit is grounded.

[0013] Preferably, the bias circuit includes a first bias circuit and a second bias circuit; an input end of the first bias circuit and an input end of the second bias circuit are respectively connected to the supply voltage, an output end of the first bias circuit is connected to the base of the first transistor, and an output end of the second bias circuit is connected to the base of the second transistor.

[0014] Preferably, the AC voltage stacked power amplifier also includes a first resistor and a second resistor; the output end of the first bias circuit is connected to the base of the first transistor after being connected in series with the first resistor; the output end of the second bias circuit is connected to the base of the second transistor after being connected in series with the second resistor.

[0015] Preferably, the AC voltage stacked power amplifier further includes a second capacitor, a first end of the second capacitor is connected to the output end of the inter-stage matching network, and a second end of the second capacitor is connected to the base of the first transistor.

[0016] Preferably, the driver stage amplifier comprises a third transistor, a third bias circuit and a third resistor; the output end of the third bias circuit is connected to the base of the third transistor after being connected in series with the third resistor, the collector of the third transistor is respectively connected to the first DC power supply voltage and the input end of the inter-stage matching network, and the emitter of the third transistor is grounded;

[0017] The AC voltage stacked power amplifier further includes a third capacitor, a first end of the third capacitor is connected to the output end of the input matching network, and a second end of the third capacitor is connected to the base of the third transistor.

[0018] Preferably, the AC voltage stacked power amplifier further includes a fourth inductor, a first end of the fourth inductor is connected to the collector of the third transistor, and a second end of the fourth inductor is connected to the first DC power supply voltage.

[0019] Preferably, the first bias circuit, the second bias circuit and the third bias circuit have the same structure.

[0020] Preferably, the first bias circuit includes a fourth transistor, a fifth transistor, a sixth transistor, a fourth resistor and a fourth capacitor;

[0021] The first end of the fourth resistor serves as the input end of the first bias circuit, and the second end of the fourth resistor is connected to the collector of the fifth transistor;

[0022] The collector of the fourth transistor is connected to the power supply voltage, the base of the fourth transistor is respectively connected to the base of the fifth transistor and the first end of the fourth capacitor, and the emitter of the fourth transistor serves as the output end of the first bias circuit;

[0023] The base of the fifth transistor is connected to the collector of the fifth transistor, and the emitter of the fifth transistor is connected to the collector of the sixth transistor;

[0024] The base of the sixth transistor is connected to the collector of the sixth transistor, and the emitter of the sixth transistor is connected to the second end of the fourth capacitor and is grounded together.

[0025] Compared with the related art, in an embodiment of the present invention, the input end of the bias circuit is used to connect to the power supply voltage, the output end of the bias circuit is connected to the input end of the AC voltage stacking circuit, the output end of the AC voltage stacking circuit is connected to the output matching network, the base of the driver stage amplifier is connected to the input matching network, the emitter of the driver stage amplifier is grounded, the collector of the driver stage amplifier is respectively connected to the first DC power supply voltage and the input end of the inter-stage matching network, and the output end of the inter-stage matching network is connected to the input end of the AC voltage stacking circuit; the base of the first transistor is used as the first input end to connect to the output end of the inter-stage matching network, the emitter of the first transistor is grounded, and the collector of the first transistor is respectively connected to the first end of the first capacitor and the first end of the first inductor; the second end of the first inductor is used as the second input end to connect to the second DC power supply voltage, the second end of the first capacitor is respectively connected to the first end of the second inductor and the emitter of the second transistor, and the second end of the second inductor is grounded; the base of the second transistor is used as the third input end to connect to the output end of the bias circuit, the collector of the second transistor is used as the output end of the AC voltage stacking circuit, and is also used to connect to the third DC power supply voltage. This makes the AC voltage swing at the signal output end twice as large as before, which can double the AC voltage swing and load impedance. Compared with a single-ended power amplifier, the saturated power and gain are 3dB higher. In addition, the saturated power and gain can be increased without increasing the power supply voltage and reducing the load impedance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be described in detail below in conjunction with the accompanying drawings. The above and other aspects of the present invention will become clearer and easier to understand through the detailed description made in conjunction with the following drawings. In the accompanying drawings:

[0027] Figure 1 is a circuit diagram of an AC voltage stacked power amplifier according to an embodiment of the present invention;

[0028] Figure 2 is a circuit diagram of a first bias circuit in an embodiment of the present invention;

[0029] Figure 3 It is a simulation diagram of the gain power and gain compression of the power amplifier with AC voltage stacking in the embodiment of the present invention.

[0030] Among them, 100, AC voltage stacked power amplifier, 1, signal input terminal, 2, input matching network, 3, inter-stage matching network, 4, AC voltage stacking circuit, 5, output matching network, 6, signal output terminal, 7, bias circuit, 71, first bias circuit, 72, second bias circuit, 73, third bias circuit, 8, bias matching circuit, 9, driving stage amplifier. DETAILED DESCRIPTION

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0032] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figure 1-3As shown, an embodiment of the present invention provides an AC voltage stacked power amplifier 100, which includes a signal input terminal 2, an input matching network 2, a driver stage amplifier 9, an inter-stage matching network 3, an AC voltage stacking circuit 4, an output matching network 5, a signal output terminal 6, and a bias circuit 7 for providing a bias voltage for the AC voltage stacking circuit 4, the input terminal of the bias circuit 7 is used to connect to the power supply voltage Vreg, the output terminal of the bias circuit 7 is connected to the input terminal of the AC voltage stacking circuit 4, the output terminal of the AC voltage stacking circuit 4 is connected to the output matching network 5, the base of the driver stage amplifier 9 is connected to the input matching network 2, the emitter of the driver stage amplifier 9 is grounded, the collector of the driver stage amplifier 9 is respectively connected to the first DC power supply voltage VCC1 and the input terminal of the inter-stage matching network 3, and the output terminal of the inter-stage matching network 3 is connected to the input terminal of the AC voltage stacking circuit 4. The RF signal is output to the input matching network 2 through the signal input terminal 2, and then output to the driver stage amplifier 9 through the input matching network 2 for power amplification. The driver stage amplifier 9 is connected to the first DC power supply voltage VCC1, and the amplified RF signal is output to the interstage matching network 3. After interstage matching through the interstage matching network 3, it is output to the input terminal of the AC voltage stacking circuit 4. The input RF voltage is stacked through the AC voltage stacking circuit 4 to double the AC voltage swing and load impedance, thereby improving the saturation power and gain.

[0035] The AC voltage stacking circuit 4 includes a first transistor Q1, a second transistor Q2, a first inductor L1, a second inductor L2 and a first capacitor C1, and the input end of the AC voltage stacking circuit 4 includes a first input end, a second input end, a third input end and a fourth input end.

[0036] The base of the first transistor Q1 is connected to the output end of the inter-stage matching network 3 as the first input end, the emitter of the first transistor Q1 is grounded, the collector of the first transistor Q1 is respectively connected to the first end of the first capacitor C1 and the first end of the first inductor L1, the second end of the first inductor L1 is connected to the second DC power supply voltage VCC2 as the second input end, the second end of the first capacitor C1 is respectively connected to the first end of the second inductor L2 and the emitter of the second transistor Q2, and the second end of the second inductor L2 is grounded;

[0037] The base of the second transistor Q2 is connected to the output end of the bias circuit 7 as the third input end, and the collector of the second transistor Q2 is connected to the output end of the AC voltage stacking circuit 4 and is also connected to the third DC power supply voltage VCC3.

[0038] The RF voltage output by the driver amplifier 9 after being connected to the first DC power supply voltage VCC1 is set as the RF part voltage, and the voltage output by the second DC power supply voltage VCC2 and the third quality power supply voltage VCC3 after being connected to the first transistor Q1 and the second transistor Q2 respectively is set as the DC part voltage.

[0039] Specifically, the first DC power supply voltage VCC1, the second DC power supply voltage VCC2 and the third DC power supply voltage VCC3 are respectively amplified by the driving stage amplifier, the first transistor Q1 and the second transistor Q2 to form a radio frequency signal, thereby achieving the effect of AC voltage stacking.

[0040] Specifically, the driver amplifier 9 provides a single-ended output partial gain, and the first transistor Q1 and the second transistor Q2 realize the AC voltage stacking function. By connecting the emitter of the second transistor Q2 in parallel with the second inductor L2 to the ground, the emitter voltage of the second transistor Q2 is 0 (DC part) ± VCC1 (RF part). The emitter of the second transistor Q2 and the collector of the first transistor Q1 are connected in series with the first capacitor C1, and the first capacitor C1 has the function of isolating DC and passing AC. The collector of the first transistor Q1 is connected in parallel with the first inductor L1 to the ground. Therefore, the collector voltage of the first transistor Q1 is VCC2 (DC part) ± VCC1 (RF part). Then the collector voltage of the second transistor Q2 is VCC3 (DC part) ± 2VCC1 (RF part). Therefore, the AC voltage swing output by the AC voltage stacking circuit 4 is twice the original. Assume that the load impedance of the first transistor Q1 is the same as the load impedance of the single-ended power amplifier, and the load impedance of the second transistor Q2 is twice the load impedance of the first transistor Q1. The AC voltage stacking circuit 4 can double the AC voltage swing and load impedance. Theoretically, compared with a single-ended power amplifier, the saturation power and gain are 3 dB higher. Therefore, the driver amplifier 9 and the AC voltage stacking circuit 4 can improve the gain and saturation power of the power amplifier.

[0041] In this embodiment, the AC voltage stacked power amplifier 100 further includes a third inductor L3, and the emitter of the second transistor Q2 is connected to the third DC power supply voltage VCC3 after being connected in series with the third inductor L3. The second DC power supply voltage VCC3 is connected to the emitter of the second transistor Q2 through the third inductor L3, so that the voltage of the emitter of the second transistor Q2 is lower than the second DC power supply voltage VCC3, so that the output load voltage is stable and has high reliability.

[0042] In this embodiment, the AC voltage stacked power amplifier 100 further includes a bias matching circuit 8, a first end of the bias matching circuit 8 is connected to the base of the second transistor Q2, a second end of the bias matching circuit 8 is connected to the output end of the bias circuit 7, and a third end of the bias matching circuit 8 is grounded. The bias matching circuit 8 is connected to the bias circuit 7 to match the bias voltage of the bias circuit 7 and output it to the base of the second transistor Q2, thereby increasing the input voltage of the second transistor Q2, thereby making the collector voltage swing and load impedance of the second transistor Q2 larger, which is beneficial to improving the saturation power and gain of the power amplifier.

[0043] In this embodiment, the bias circuit 7 includes a first bias circuit 71 and a second bias circuit 72; the input end of the first bias circuit 71 and the input end of the second bias circuit 72 are respectively connected to the supply voltage, the output end of the first bias circuit 71 is connected to the base of the first transistor Q1, and the output end of the second bias circuit 72 is connected to the base of the second transistor Q2. The first bias circuit 71 and the second bias circuit 72 provide input voltage bias for the first transistor Q1 and the second transistor Q2 respectively.

[0044] In this embodiment, the AC voltage stacked power amplifier 100 also includes a first resistor R1 and a second resistor R2; the output end of the first bias circuit 71 is connected to the base of the first transistor Q1 after being connected in series with the first resistor R1; the output end of the second bias circuit 72 is connected to the base of the second transistor Q2 after being connected in series with the second resistor R2.

[0045] Among them, the first end of the first resistor R1 is connected to the output end of the first bias circuit 71, and the second end of the first resistor R1 is connected between the base of the first transistor Q1 and the output end of the inter-stage matching network 3; the first end of the second resistor R2 is connected to the output end of the second bias circuit 72, and the second end of the second resistor R2 is connected to the second end of the bias matching circuit 8. The first resistor R1 and the second resistor R2 are used to step down the bias voltage output by the first bias circuit 71 and the second bias circuit 72, respectively, so that the voltage output to the base of the first transistor Q1 and the base of the second transistor Q2 is stable and has high reliability.

[0046] In this embodiment, the AC voltage stacked power amplifier 100 further includes a second capacitor C2, a first end of the second capacitor C2 is connected to the output end of the inter-stage matching network 3, and a second end of the second capacitor C2 is connected to the base of the first transistor Q1. The second capacitor C2 is used to increase the RF voltage output by the inter-stage matching network 3, and output the RF voltage to the base of the first transistor Q1, so as to realize the AC voltage stacking function through the first transistor Q1, and improve the saturation power and gain of the power amplifier.

[0047] In this embodiment, the driver amplifier includes a third transistor Q3, a third bias circuit 73 and a third capacitor C3, the output end of the third bias circuit 73 is connected to the base of the third transistor Q3 after being connected in series with the third resistor R3, the collector of the third transistor Q3 is respectively connected to the first DC power supply voltage VCC1 and the input end of the inter-stage matching network 3, and the emitter of the third transistor Q3 is grounded. The third capacitor C3 is used to increase the RF voltage output by the input matching network 2, and output the RF voltage to the base of the driver amplifier 9, so as to realize power amplification through the driver amplifier 9 and improve the gain of the power amplifier.

[0048] The AC voltage stacked power amplifier 100 further includes a fourth inductor L4, a first end of which is connected to the collector of the third transistor Q3, and a second end of which is connected to the first DC power supply voltage VCC1, so as to increase the collector voltage and voltage stability of the third transistor Q3.

[0049] In this embodiment, the first bias circuit 71, the second bias circuit 72 and the third bias circuit 73 have the same structure. By changing the parameters of the components inside the first bias circuit 71, the second bias circuit 72 and the third bias circuit 73, different bias voltages are output to bias the first transistor Q1, the second transistor Q2 and the driver amplifier 9 respectively.

[0050] In this embodiment, the first bias circuit 71 includes a fourth transistor Q4, a fifth transistor Q5, a sixth transistor Q6, a fourth resistor R4 and a fourth capacitor C4.

[0051] The first end of the fourth resistor R4 serves as the input end of the first bias circuit 71, and the second end of the fourth resistor R4 is connected to the collector of the fifth transistor Q5;

[0052] The collector of the fourth transistor Q4 is connected to the supply voltage, the base of the fourth transistor Q4 is respectively connected to the base of the fifth transistor Q5 and the first end of the fourth capacitor C4, and the emitter of the fourth transistor Q4 serves as the output end of the first bias circuit 71;

[0053] The base of the fifth transistor Q5 is connected to the collector of the fifth transistor Q5, and the emitter of the fifth transistor Q5 is connected to the collector of the sixth transistor Q6;

[0054] The base of the sixth transistor Q6 is connected to the collector of the sixth transistor Q6 , and the emitter of the sixth transistor Q6 is connected to the second end of the fourth capacitor C4 and grounded together.

[0055] In this embodiment, when the output power of the AC voltage stacked power amplifier 100 is continuously increased, the output gain is also continuously increased, and the gain compression is gradually reduced as the output gain increases. When the output gain is maximum, the gain compression is 0. When the output power continues to increase, the output gain is reduced, and the gain compression is continuously increased.

[0056] It should be noted that the various embodiments described above with reference to the accompanying drawings are only used to illustrate the present invention rather than to limit the scope of the present invention. Those skilled in the art should understand that any modification or equivalent substitution of the present invention without departing from the spirit and scope of the present invention should be included within the scope of the present invention. In addition, unless otherwise indicated by the context, words appearing in the singular include the plural form, and vice versa. In addition, unless otherwise specified, all or part of any embodiment may be used in combination with all or part of any other embodiment.

Claims

1. An AC voltage stacked power amplifier, comprising a signal input terminal, an input matching network, a driver stage amplifier, an inter-stage matching network, an AC voltage stacking circuit, an output matching network, a signal output terminal, and a bias circuit for providing a bias voltage for the AC voltage stacking circuit, wherein the input terminal of the bias circuit is used to connect to a power supply voltage, the output terminal of the bias circuit is connected to the input terminal of the AC voltage stacking circuit, and the output terminal of the AC voltage stacking circuit is connected to the output matching network, characterized in that: The base of the driver stage amplifier is connected to the input matching network, the emitter of the driver stage amplifier is grounded, the collector of the driver stage amplifier is respectively connected to the first DC power supply voltage and the input end of the inter-stage matching network, and the output end of the inter-stage matching network is connected to the input end of the AC voltage stacking circuit; The AC voltage stacking circuit includes a first transistor, a second transistor, a first inductor, a second inductor and a first capacitor, and the input end of the AC voltage stacking circuit includes a first input end, a second input end, a third input end and a fourth input end; The base of the first transistor is connected to the output end of the inter-stage matching network as the first input end, the emitter of the first transistor is grounded, and the collector of the first transistor is respectively connected to the first end of the first capacitor and the first end of the first inductor; the second end of the first inductor is connected to the second DC power supply voltage as the second input end, the second end of the first capacitor is respectively connected to the first end of the second inductor and the emitter of the second transistor, and the second end of the second inductor is grounded; The base of the second transistor is connected to the output end of the bias circuit as the third input end, the collector of the second transistor is used as the output end of the AC voltage stacking circuit and is also used to be connected to the third DC power supply voltage; the collector of the second transistor is also connected to the third DC power supply voltage as the fourth input end of the AC voltage stacking circuit; The bias circuit comprises a first bias circuit and a second bias circuit; an input end of the first bias circuit and an input end of the second bias circuit are respectively connected to the supply voltage, an output end of the first bias circuit is connected to the base of the first transistor, and an output end of the second bias circuit is connected to the base of the second transistor; The first bias circuit includes a fourth transistor, a fifth transistor, a sixth transistor, a fourth resistor and a fourth capacitor; The first end of the fourth resistor serves as the input end of the first bias circuit, and the second end of the fourth resistor is connected to the collector of the fifth transistor; The collector of the fourth transistor is connected to the power supply voltage, the base of the fourth transistor is respectively connected to the base of the fifth transistor and the first end of the fourth capacitor, and the emitter of the fourth transistor serves as the output end of the first bias circuit; The base of the fifth transistor is connected to the collector of the fifth transistor, and the emitter of the fifth transistor is connected to the collector of the sixth transistor; The base of the sixth transistor is connected to the collector of the sixth transistor, and the emitter of the sixth transistor is connected to the second end of the fourth capacitor and is grounded together.

2. The AC voltage stacked power amplifier according to claim 1, characterized in that: The AC voltage stacked power amplifier further includes a third inductor, and the collector of the second transistor is connected to the third DC power supply voltage after being connected in series with the third inductor.

3. The AC voltage stacked power amplifier according to claim 1, characterized in that: The AC voltage stacked power amplifier also includes a bias matching circuit, a first end of the bias matching circuit is connected to the base of the second transistor, a second end of the bias matching circuit is connected to the output end of the bias circuit, and a third end of the bias matching circuit is grounded.

4. The AC voltage stacked power amplifier according to claim 3, characterized in that: The AC voltage stacked power amplifier also includes a first resistor and a second resistor; the output end of the first bias circuit is connected to the base of the first transistor after being connected in series with the first resistor; the output end of the second bias circuit is connected to the base of the second transistor after being connected in series with the second resistor.

5. The AC voltage stacked power amplifier according to claim 4, characterized in that: The AC voltage stacked power amplifier further includes a second capacitor, a first end of the second capacitor is connected to the output end of the inter-stage matching network, and a second end of the second capacitor is connected to the base of the first transistor.

6. The AC voltage stacked power amplifier according to claim 4, characterized in that: The driver stage amplifier comprises a third transistor, a third bias circuit and a third resistor; the output end of the third bias circuit is connected to the base of the third transistor after being connected in series with the third resistor, the collector of the third transistor is respectively connected to the first DC power supply voltage and the input end of the inter-stage matching network, and the emitter of the third transistor is grounded; The AC voltage stacked power amplifier further includes a third capacitor, a first end of the third capacitor is connected to the output end of the input matching network, and a second end of the third capacitor is connected to the base of the third transistor.

7. The AC voltage stacked power amplifier according to claim 6, characterized in that: The AC voltage stacked power amplifier further includes a fourth inductor, a first end of the fourth inductor being connected to the collector of the third transistor, and a second end of the fourth inductor being connected to the first DC power supply voltage.

8. The AC voltage stacked power amplifier according to claim 7, characterized in that: The first bias circuit, the second bias circuit and the third bias circuit have the same structure.

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