Power divider applied to power amplifier, power amplifier and design method thereof

Abstract

The invention discloses a power divider applied to a power amplifier, the power amplifier and a design method of the power amplifier. The power divider comprises an input port and at least two output ports; the input port is used for being connected with a driving module of the power amplifier, and each output port of the power divider is used for being connected with a power amplification module of the power amplifier; the impedance of the input port of the power divider is smaller than the output impedance of the driving module and larger than the impedance of the output port. And the impedance of the output port is greater than that of the corresponding power amplification module. According to the invention, the Q value of inter-stage matching of the power amplifier can be reduced, and the integration level of the power amplifier is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power amplifiers, and particularly to a power splitter applied to a power amplifier, a power amplifier and a design method thereof. Background Art

[0002] With the development of modern communication technologies, there are increasingly high requirements for miniaturization and high integration of devices. Correspondingly, there are also increasingly high requirements for the integration and bandwidth of power amplifiers, which are important devices in communication technologies.

[0003] A power amplifier generally includes a driver stage, a power splitter, and a power amplifier stage. In related technologies, the area occupied by the power amplifier is relatively large, the integration is low, and at the same time, the Q value of the inter-stage matching is relatively large, and the matching bandwidth is narrow, thus restricting the development of the power amplifier. Summary of the Invention

[0004] The present invention provides a power splitter applied to a power amplifier, a power amplifier and a design method thereof, so as to reduce the Q value of the inter-stage matching and improve the integration of the power amplifier.

[0005] According to one aspect of the present invention, a power splitter applied to a power amplifier is provided. The power splitter includes an input port and at least two output ports;

[0006] The input port is used to connect the driver module of the power amplifier, and each output port of the power splitter is used to connect a power amplification module of the power amplifier; the impedance of the input port of the power splitter is less than the output impedance of the driver module and greater than the impedance of the output port; the impedance of the output port is greater than the impedance of the corresponding power amplification module.

[0007] Optionally, the impedance of the input port of the power splitter is greater than a first preset value, and the impedance of the output port of the power splitter is less than the first preset value;

[0008] Wherein, the ratio of the output impedance of the driver module to the first preset value is equal to the ratio of the first preset value to the input impedance of the power amplification module.

[0009] Optionally, the ratio of the output impedance of the driver module to the impedance of the input port of the power splitter is a first ratio, the ratio of the impedance of the input port of the power splitter to the impedance of the output port of the power splitter is a second ratio, and the ratio of the output port of the power splitter to the impedance of the input port of the power amplification module is a third ratio; the error between any two of the first ratio, the second ratio, and the third ratio is less than a second preset value.

[0010] Optionally, the power splitter includes a microstrip line.

[0011] Optionally, the power divider is equivalently implemented by lumped elements.

[0012] According to another aspect of the present invention, there is provided a power amplifier, which includes a driving module, at least two power amplification modules, and the power divider as described above; an input port of the power divider is electrically connected to the driving module, and the power amplification module is electrically connected to a corresponding output port in the power divider.

[0013] Optionally, the driving module includes a driving-stage power amplifier unit, a driving-stage input matching unit, and a driving-stage output matching unit. An output end of the driving-stage input matching unit is electrically connected to an input end of the driving-stage power amplifier unit, an input end of the driving-stage output matching unit is electrically connected to an output end of the driving-stage power amplifier unit, and an output end of the driving-stage output matching unit is electrically connected to the input port of the power divider;

[0014] The at least two power amplification modules include a carrier power amplification module and at least one peak power amplification module.

[0015] According to another aspect of the present invention, there is provided a design method of a power amplifier, the power amplifier including a driving module, at least two power amplification modules, and a power divider;

[0016] The design method of the power amplifier includes:

[0017] Obtaining an output impedance of the driving module and an input impedance of the power amplification module;

[0018] Setting an impedance of the input port of the power divider to be less than the output impedance of the driving module and greater than the impedance of the output port; and setting an impedance of the output port of the power divider to be greater than the impedance of the corresponding power amplification module.

[0019] Optionally, the setting of the impedance of the input port of the power divider further includes:

[0020] Setting the impedance of the input port of the power divider to be greater than a first preset value;

[0021] The setting of the impedance of the output port further includes:

[0022] Setting the impedance of the output port of the power divider to be less than the first preset value;

[0023] Wherein, a ratio of the impedance of the driving module to the first preset value is equal to a ratio of the first preset value to the impedance of the power amplification module.

[0024] Optionally, setting the impedance of the input port of the power splitter to be greater than the first preset value and setting the impedance of the output port of the power splitter to be less than the first preset value further includes: setting the ratio of the output impedance of the driving module to the impedance of the input port of the power splitter as a first ratio, the ratio of the impedance of the input port of the power splitter to the impedance of the output port of the power splitter as a second ratio, and the ratio of the output port of the power splitter to the impedance of the input port of the power amplification module as a third ratio; the error between any two of the first ratio, the second ratio, and the third ratio is less than a second preset value.

[0025] The technical solution of the embodiment of the present invention uses a power splitter including an input port and at least two output ports. The impedance of the input port of the power splitter is less than the output impedance of the driving module and greater than the impedance of the output port; the impedance of the output port is greater than the impedance of the power amplification module. By setting the impedances of the input port and the output port of the power splitter to be different, the power splitter participates in impedance transformation, and thus shares part of the impedance transformation requirements of the driving module and the power amplification module. Therefore, the impedance transformation ratio of the inter-stage matching can be reduced, the Q value of the inter-stage matching is relatively low, and in addition, the complexity of the matching network in the driving module and the power amplification module is reduced, the area is reduced, and thus the integration degree of the power amplifier and the bandwidth characteristic of the inter-stage matching are improved.

[0026] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0028] Figure 1 It is a schematic structural diagram of a power splitter provided by an embodiment of the present invention;

[0029] Figure 2 It is a schematic circuit structure diagram of a power amplifier provided by an embodiment of the present invention;

[0030] Figure 3 It is an equivalent schematic diagram of a power splitter provided by an embodiment of the present invention;

[0031] Figure 4 It is another equivalent schematic diagram of a power splitter provided by an embodiment of the present invention;

[0032] Figure 5 It is the Smith chart corresponding to impedance matching in a traditional design;

[0033] Figure 6 It is another Smith chart corresponding to impedance matching in a traditional design;

[0034] Figure 7 It is the Smith chart corresponding to impedance matching of the power amplifier provided by the embodiment of the present invention;

[0035] Figure 8 It is the flowchart of a design method of a power amplifier provided by the embodiment of the present invention. Detailed implementation manners

[0036] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0038] As mentioned in the background art, the existing power amplifiers have the problem of low integration. After careful research, the inventor found that the reason for this technical problem is as follows: for a power amplifier that uses a single-tube driver stage to drive a power-stage Doherty architecture power amplifier, a power splitter needs to be set between the driver stage and the power stage. And the output impedance of the driver stage is usually high, while the input impedance of the power stage is usually low. In the related art, the input port and output port impedances of the power splitter are the same, which makes the driver stage require a relatively complex matching transformation network to match the input port impedance of the power splitter. Similarly, the power stage also requires a complex matching transformation network to match the output port impedance of the power splitter. This leads to a relatively large impedance transformation for the inter-stage matching of the power amplifier, and the too large impedance transformation ratio also makes the Q value large, affecting the bandwidth characteristics of the inter-stage matching. In addition, the too large impedance transformation ratio also makes the structure of the final power amplifier relatively complex and the integration low.

[0039] In view of the above technical problems, the present invention proposes the following solutions:

[0040] Figure 1 FIG. [X] is a schematic structural diagram of a power splitter provided by an embodiment of the present invention. Figure 2 FIG. [X] is a schematic circuit structure diagram of a power amplifier provided by an embodiment of the present invention, referring to Figure 1 and Figure 2 . The power splitter 1 includes an input port A and at least two output ports. Among them, taking the at least two output ports including a first output port B1 and a second output port B2 as an example. The input port A is used to connect the drive module 2 of the power amplifier, and each output port of the power splitter is used to connect a power amplification module of the power amplifier; the impedance of the input port A of the power splitter is less than the output impedance of the drive module 2 and greater than the impedance of the output port; the impedance of the output port is greater than the impedance of the corresponding power amplification module.

[0041] Specifically, the power splitter 1 can distribute the power of its input port A to its output ports. For example, the power of each output port can be equal. In a power amplifier with a Doherty architecture, the power amplification module includes a carrier power amplification module 31 and at least one peak power amplification module 32. In this embodiment, the power splitter 1 is a three-port device, and its first output port B1 is connected to the carrier power amplification module 31, and the second output port B2 is connected to the peak power amplification module 32. Of course, in some other embodiments, the power amplifier includes at least two peak power amplification modules 32, and correspondingly, the power splitter 1 includes at least three output ports.

[0042] In the related art, the input port A and the output ports of the power divider 1 have the same impedance. That is to say, the power divider 1 does not participate in impedance transformation in the power amplifier and only performs power distribution. In this embodiment, the impedance of the input port and the output ports of the power divider 1 is different, and the impedance magnitudes of the respective relevant modules in the power amplifier are: output impedance of the drive module > impedance of the input port of the power divider > impedance of the output port of the power divider > input impedance of the power amplification module. That is to say, the power divider not only participates in impedance transformation in the power amplifier, but also converts the two-stage impedance transformation between the drive module and the power amplification module in the traditional power amplifier into three-stage or more-stage impedance transformation, which can make the transformation ratios of the respective impedance transformations smaller, and thus make the impedance transformation for inter-stage matching smaller, and consequently make the Q value for inter-stage matching smaller. In addition, the smaller impedance transformation ratio also makes the structures of the drive-stage output matching unit in the drive module and the power-stage input matching unit in the power amplification module relatively simple.

[0043] It should be noted that in the traditional technology, the structures of the drive-stage output matching unit in the drive module and the power-stage input matching unit in the power amplification module are relatively complex, with a large number of components, and thus the occupied area is large. However, the structure of the power divider is relatively simple, and when the impedance of its input port and output ports changes, the impact on its overall occupied area is small. Therefore, the design of the power divider in this embodiment makes the structures of the drive-stage output matching unit in the drive module and the power-stage input matching unit in the power amplification module relatively simple, with a smaller occupied area, and thus reduces the overall occupied area of the power amplifier, thereby improving the integration degree of the power amplifier. Of course, from another perspective, when the area of the power amplifier is the same, this embodiment can reduce the Q value of the overall inter-stage matching, thereby greatly improving the bandwidth characteristic of the inter-stage matching.

[0044] The technical solution of this embodiment uses a power divider that includes an input port and at least two output ports. The impedance of the input port of the power divider is less than the output impedance of the drive module and greater than the impedance of the output ports; the impedance of the output ports is greater than the impedance of the power amplification module. By setting the impedance of the input port and the output ports of the power divider to be different, the power divider participates in impedance transformation, and thus shares part of the impedance transformation requirements of the drive module and the power amplification module. Therefore, the impedance transformation ratio for inter-stage matching can be reduced, making the Q value for inter-stage matching lower. In addition, the complexity of the matching network in the drive module and the power amplification module is also reduced, and the area is decreased, thereby improving the integration degree of the power amplifier and the bandwidth characteristic of the inter-stage matching.

[0045] Optionally, referring to Figure 2, in the above embodiment, the driving module 2 includes a driving stage power amplifier unit 21, a driving stage input matching unit 22, and a driving stage output matching unit 23. The input end of the driving stage input matching unit 22 is connected to an input matching port 4, which can be a 50-ohm port. The output end of the driving stage input matching unit 22 is electrically connected to the input end of the driving stage power amplifier unit 21; the input end of the driving stage output matching unit 23 is electrically connected to the output end of the driving stage power amplifier unit 21, and the output end of the driving stage output matching unit 23 is electrically connected to the input port A of the power divider 1. The driving stage power amplifier unit 21 can be, for example, a Class-AB power amplifier. The driving stage input matching unit 22 and the driving stage output matching unit 23 can be matching networks composed of components such as resistors, capacitors, and inductors. The design method of its specific structure is well-known to those skilled in the art and will not be elaborated here.

[0046] Optionally, as Figure 2 shown, the carrier power amplification module 31 includes a carrier input matching unit 311, a carrier power amplifier unit 312, a carrier output matching unit 313, and a quarter-wavelength transmission line 314. Among them, the input end of the carrier input matching unit 311 is electrically connected to the first output port B1 of the power divider 1, the output end of the carrier input matching unit 311 is electrically connected to the input end of the carrier power amplifier unit 312. The carrier power amplifier unit 312 includes, for example, transistors. The output end of the carrier power amplifier unit 312 is electrically connected to the first end of the quarter-wavelength transmission line 314, and the second end of the quarter-wavelength transmission line 314 is electrically connected to the combining module 5.

[0047] The peak power amplification module 32 includes a peak input matching unit 321, a peak power amplifier unit 322, and a peak output matching unit 323. The input end of the peak input matching unit 321 is electrically connected to the second output end B2 of the power divider. The output end of the peak input matching unit 321 is electrically connected to the input end of the peak power amplifier unit 322. The output end of the peak power amplifier unit 322 is electrically connected to the input end of the peak output matching unit 323, and the output end of the peak output matching unit 323 is electrically connected to the combining module 5. Each matching unit in the power amplification module can be a matching network composed of components such as resistors, capacitors, and inductors. The power amplifier unit can be a transistor. The combining module 5 can be a 50-ohm port. The specific working principle of the Doherty power amplifier is well-known to those skilled in the art and will not be elaborated here.

[0048] Optionally, Figure 3 is an equivalent schematic diagram of a power divider provided by an embodiment of the present invention. Refer to Figure 3In this embodiment, the power divider includes a microstrip line. The power divider can be a Wilkinson power divider, which may include a first microstrip line 11 and a second microstrip line 12. In its equivalent circuit diagram, it includes the impedance 13 of the input port, the impedance 14 of the first output port, the impedance 15 of the second output port, and the isolation resistor 16. When it is necessary to adjust the impedance of the input port or the output port, only the width or thickness of the microstrip line needs to be adjusted.

[0049] Optionally, Figure 4 is an equivalent schematic diagram of another power divider provided by an embodiment of the present invention. Refer to Figure 4 In this embodiment, the power divider is equivalently implemented by lumped elements. For example, it includes a first lumped element equivalent 17 and a second lumped element equivalent 18. Each integrated circuit is a low-pass π-type model, that is, it includes a first capacitor C1, a second capacitor C2, and an inductor L. The first end of the first capacitor C1 is electrically connected to the first end of the inductor L, and the second end of the first capacitor C1 is grounded; the first end of the second capacitor C2 is electrically connected to the second end of the inductor L, and the second end of the second capacitor C2 is grounded. Of course, its equivalent circuit also includes the impedance 13 of the input port, the impedance 14 of the first output port, the impedance 15 of the second output port, and the isolation resistor 16. When it is necessary to adjust the impedance of the input port or the output port, one or more parameters of the first capacitor C1, the second capacitor C2, and the inductor L can be adjusted.

[0050] It should be noted that the structure of the power divider is not limited to the above, and it can also be some other structures well-known in the art. In addition, the impedances of the output ports of the power divider are equal.

[0051] In some embodiments, optionally, the impedance of the input port A of the power divider 1 is greater than a first preset value, and the impedance of the output port of the power divider 1 is less than the first preset value; wherein, the ratio of the output impedance of the driving module to the first preset value is equal to the ratio of the first preset value to the input impedance of the power amplification module.

[0052] Specifically, when the impedances of the input port and the output port of the power divider are both equal to the first preset value, the impedance transformation ratio from the driving module to the power divider is the same as the impedance transformation ratio from the output port to the power amplification module. At this time, a lower Q value can be obtained. However, at this time, the power divider does not participate in impedance transformation, and the impedance transformation ratios between the driving module and the input port of the power divider, and between the output port of the power divider and the power amplification module are both large. The setting of this embodiment can make the impedance transformation ratios between the driving module and the input port of the power divider, between the input port and the output port of the power divider, and between the output port of the power divider and the power amplification module all small, so that the Q value of the inter-stage matching can be further improved.

[0053] Further, in the above embodiments, the ratio of the output impedance of the drive module to the impedance of the input port of the power splitter is set as the first ratio, the ratio of the impedance of the input port of the power splitter to the impedance of the output port of the power splitter is set as the second ratio, and the ratio of the impedance of the output port of the power splitter to the impedance of the input port of the power amplifier module is set as the third ratio; the error between any two of the first ratio, the second ratio, and the third ratio is less than the second preset value. In the above embodiments, the first ratio, the second ratio, and the third ratio can be set to be equal. Of course, due to precision limitations, it can be considered that they are equal when the error is within the second preset value, and the second preset value is, for example, 5%. Such a setting can make the impedance transformation ratios of each inter-stage matching equal, thereby minimizing the Q value of the inter-stage matching to the greatest extent and maximizing the bandwidth characteristics of the inter-stage matching.

[0054] Exemplarily, taking the design at 3.5 GHz as an example, according to the actual power requirement, the optimal output impedance of the drive module is 100 ohms, and the optimal input impedance of the power amplifier module is 1 ohm. Figure 5 For the Smith chart corresponding to the impedance matching in a traditional design, as Figure 5 shown. At this time, the impedances of both the input port and the output port of the power splitter are 50 Ω, and the Q value of the inter-stage matching at this time is 3.5, that is, it has a relatively high Q value. Figure 6 For the Smith chart corresponding to the impedance matching in another traditional design, as Figure 6 shown. At this time, the impedances of both the input port and the output port of the power splitter are 10 Ω, and the Q value of the inter-stage matching at this time is 1.5, that is, the Q value of the inter-stage matching is reduced to a certain extent. Figure 7 For the Smith chart corresponding to the impedance matching of the power amplifier provided by the embodiment of the present invention, in this embodiment, according to the above rules, the impedance of the input port of the power splitter is determined to be 21.5, and the impedance of the output port of the power splitter is 4.7. Then the Q value of the inter-stage matching is 0.84, that is, it can greatly reduce the Q value of the inter-stage matching, and further greatly improve the bandwidth characteristics.

[0055] The present invention also provides a power amplifier, as Figure 2 shown. The power amplifier includes a drive module 2, at least one power amplifier module, and the power splitter provided by any embodiment of the present invention; the input port of the power splitter is electrically connected to the drive module 2, and the power amplifier module is electrically connected to the corresponding output port in the power splitter 1. The power amplifier provided by the embodiment of the present invention is of Doherty architecture, and the power amplifier has the characteristics of a relatively low overall inter-stage matching Q value, good inter-stage matching bandwidth characteristics, and high integration.

[0056] Optionally, as Figure 2As shown, the drive module includes a drive - stage power amplifier unit, a drive - stage input matching unit, and a drive - stage output matching unit. The output end of the drive - stage input matching unit is electrically connected to the input end of the drive - stage power amplifier unit. The input end of the drive - stage output matching unit is electrically connected to the output end of the drive - stage power amplifier unit. The output end of the drive - stage output matching unit is electrically connected to the input port of the power splitter. At least two power amplification modules include a carrier power amplification module and at least one peak power amplification module. The specific structure of the power amplifier provided by the embodiments of the present invention can refer to the description of the power splitter part of the present invention, which will not be elaborated here.

[0057] The present invention also provides a design method for a power amplifier, as Figure 8 shown, Figure 8 is a flowchart of a design method for a power amplifier provided by an embodiment of the present invention. The design method for the power amplifier includes:

[0058] Step S110, obtain the output impedance of the drive module and the input impedance of the power amplification module;

[0059] Step S120, set the impedance of the input port of the power splitter to be less than the output impedance of the drive module and greater than the impedance of the output port; and set the impedance of the output port of the power splitter to be greater than the impedance of the corresponding power amplification module.

[0060] Specifically, in this embodiment, the impedances of the input port and the output port of the power splitter 1 are different, and the impedance magnitudes of each relevant module in the power amplifier are: the output impedance of the drive module > the impedance of the input port of the power splitter > the impedance of the output port of the power splitter > the input impedance of the power amplification module. That is to say, the power splitter not only participates in the impedance transformation in the power amplifier, but also converts the two - stage impedance transformation between the drive module and the power amplification module in the traditional power amplifier into three - stage or more - stage impedance transformation, which can make the transformation ratio of each - stage impedance transformation relatively small, and thus the impedance transformation ratio of the inter - stage matching is relatively small. Therefore, the Q value of the inter - stage matching is also relatively small. In addition, the relatively small impedance transformation ratio makes the structures of the drive - stage output matching unit in the drive module and the power - stage input matching unit in the power amplification module relatively simple.

[0061] The design method for the power amplifier in this embodiment results in a power amplifier with a relatively low impedance transformation ratio of the inter - stage matching, a relatively low Q value of the inter - stage matching. In addition, it also reduces the complexity of the matching networks in the drive module and the power amplification module, reduces the area, and thus improves the integration degree and the bandwidth characteristics of the inter - stage matching of the power amplifier.

[0062] Optionally, setting the impedance of the input port of the power divider further includes: setting the impedance of the input port of the power divider to be greater than a first preset value; setting the impedance of the output port further includes: setting the impedance of the output port of the power divider to be less than the first preset value; wherein, the ratio of the impedance of the drive module to the first preset value is equal to the ratio of the first preset value to the impedance of the power amplification module.

[0063] Specifically, when the impedances of both the input port and the output port of the power divider are equal to the first preset value, the impedance transformation ratio from the drive module to the power divider is the same as the impedance transformation ratio from the output port to the power amplification module. At this time, a lower Q value can be obtained. However, at this time, the power divider does not participate in impedance transformation, and the impedance transformation ratios between the drive module and the input port of the power divider, and between the output port of the power divider and the power amplification module are both large. The setting of this embodiment can make the impedance transformation ratios between the drive module and the input port of the power divider, between the input port and the output port of the power divider, and between the output port of the power divider and the power amplification module all small, so that the Q value of the inter-stage matching can be further improved.

[0064] Further, in the above embodiment, set the ratio of the output impedance of the drive module to the impedance of the input port of the power divider as the first ratio, the ratio of the impedance of the input port of the power divider to the impedance of the output port of the power divider as the second ratio, and the ratio of the impedance of the output port of the power divider to the impedance of the input port of the power amplification module as the third ratio; the error between any two of the first ratio, the second ratio, and the third ratio is less than a second preset value. In the above embodiment, the first ratio, the second ratio, and the third ratio can be set to be equal. Of course, due to precision limitations, it can be considered that they are equal within the second preset value. The second preset value is, for example, 5%. Such a setting can make the impedance transformation ratios of each inter-stage matching equal, thereby minimizing the Q value of the inter-stage matching and maximizing the bandwidth characteristics of the inter-stage matching.

[0065] Optionally, setting the impedance of the input port of the power divider to be greater than a first preset value and setting the impedance of the output port of the power divider to be less than the first preset value further includes: setting the ratio of the output impedance of the driving module to the impedance of the input port of the power divider as a first ratio, the ratio of the impedance of the input port of the power divider to the impedance of the output port of the power divider as a second ratio, and the ratio of the output port of the power divider to the impedance of the input port of the power amplifier module as a third ratio; the error between any two of the first ratio, the second ratio, and the third ratio is less than a second preset value. In the above embodiment, the first ratio, the second ratio, and the third ratio can be set to be equal. Of course, due to accuracy limitations, the error can also be within 5%, that is, the second preset value is 5%. Such a setting can make the impedance transformation ratios of each inter-stage matching equal, thereby minimizing the Q value of the inter-stage matching to the greatest extent and maximizing the bandwidth characteristics of the inter-stage matching.

[0066] It should be understood that the various forms of the processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in the present invention can be executed in parallel, sequentially, or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and no limitations are imposed herein.

[0067] The above specific embodiments do not constitute a limitation on the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A power divider applied to a power amplifier, characterized in that The power splitter includes an input port and at least two output ports; The input port is used to connect to the driving module of the power amplifier, and each output port of the power splitter is used to connect to a power amplification module of the power amplifier; the impedance of the input port of the power splitter is less than the output impedance of the driving module and greater than the impedance of the output port; the impedance of the output port is greater than the impedance of the corresponding power amplification module.

2. The power divider according to claim 1, wherein The impedance of the input port of the power splitter is greater than a first preset value, and the impedance of the output port of the power splitter is less than the first preset value; Wherein, the ratio of the output impedance of the driving module to the first preset value is equal to the ratio of the first preset value to the input impedance of the power amplification module.

3. The power divider according to claim 2, characterized in that, The ratio of the output impedance of the driving module to the impedance of the input port of the power splitter is a first ratio, the ratio of the impedance of the input port of the power splitter to the impedance of the output port of the power splitter is a second ratio, and the ratio of the impedance of the output port of the power splitter to the input port of the power amplification module is a third ratio; the error between any two of the first ratio, the second ratio and the third ratio is less than a second preset value.

4. The power divider according to claim 1, characterized in that, The power splitter includes a microstrip line.

5. The power divider according to claim 1, wherein The power splitter is equivalently implemented by lumped elements.

6. A power amplifier, characterized in that, The power amplifier includes a driving module, at least two power amplification modules and the power splitter according to any one of claims 1-5; the input port of the power splitter is electrically connected to the driving module, and the power amplification module is electrically connected to the corresponding output port in the power splitter.

7. The power amplifier according to claim 6, wherein The driving module includes a driving-stage power amplifier unit, a driving-stage input matching unit and a driving-stage output matching unit. The output end of the driving-stage input matching unit is electrically connected to the input end of the driving-stage power amplifier unit. The input end of the driving-stage output matching unit is electrically connected to the output end of the driving-stage power amplifier unit, and the output end of the driving-stage output matching unit is electrically connected to the input port of the power splitter; The at least two power amplification modules include a carrier power amplification module and at least one peak power amplification module.

8. A design method of a power amplifier, characterized in that, The power amplifier includes a driving module, at least two power amplification modules and a power splitter; The design method of the power amplifier includes: Obtaining the output impedance of the driving module and the input impedance of the power amplification module; Setting the impedance of the input port of the power splitter to be less than the output impedance of the driving module and greater than the impedance of the output port; and setting the impedance of the output port of the power splitter to be greater than the impedance of the corresponding power amplification module.

9. The design method of the power amplifier according to claim 8, characterized in that The setting of the impedance of the input port of the power splitter further includes: Setting the impedance of the input port of the power splitter to be greater than a first preset value; The setting of the impedance of the output port further includes: Setting the impedance of the output port of the power splitter to be less than the first preset value; Wherein, the ratio of the impedance of the driving module to the first preset value is equal to the ratio of the first preset value to the impedance of the power amplification module.

10. The design method of the power amplifier according to claim 9, wherein, The steps of setting the impedance of the input port of the power divider to be greater than the first preset value and setting the impedance of the output port of the power divider to be less than the first preset value further include: setting the ratio of the output impedance of the driving module to the impedance of the input port of the power divider as a first ratio, the ratio of the impedance of the input port of the power divider to the impedance of the output port of the power divider as a second ratio, and the ratio of the output port of the power divider to the impedance of the input port of the power amplification module as a third ratio; the error between any two of the first ratio, the second ratio, and the third ratio is less than a second preset value.

Images