CN103326678A - Power amplifier, asymmetric Doherty power amplifier equipment and base station - Google Patents
Power amplifier, asymmetric Doherty power amplifier equipment and base station Download PDFInfo
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- CN103326678A CN103326678A CN2013102603992A CN201310260399A CN103326678A CN 103326678 A CN103326678 A CN 103326678A CN 2013102603992 A CN2013102603992 A CN 2013102603992A CN 201310260399 A CN201310260399 A CN 201310260399A CN 103326678 A CN103326678 A CN 103326678A
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Abstract
An embodiment of the invention discloses a power amplifier, asymmetric Doherty power amplifier equipment and a base station. Different radiofrequency amplifier channels are integrated in one device to form the power amplifier, so that discreteness of the different radiofrequency amplifier channels is reduced during production by means of testing and screening, and the problem that performance uncontrollability, caused by device discreteness, between the different radiofrequency power amplifier channels can be found only in application of the prior art is avoided; the power amplifier is a single device, so that low discreteness can be kept during application and the performance of an ADPA (asymmetric Doherty power amplifier) circuit can be improved.
Description
Technical field
The present invention relates to electronic information field, be specifically related to a kind of power amplifier, asymmetric Da Hedi power amplification (ADPA, Asymmetric Doherty Power Amplifier) equipment and base station.
Background technology
In growing mobile communication base station product, the direction development that the performance of radio-frequency power amplifier is more and more higher towards efficient, bandwidth is more and more wider, linearity is become better and better and area is more and more less.Along with global system for mobile communications (GSM, Global System for Mobile Communications) multicarrier, Wideband Code Division Multiple Access (WCDMA) (WCDMA, Wideband Code Division Multiple Access) multicarrier and Long Term Evolution (LTE, Long Term Evolution) commercialization of the contour peak-to-average force ratio signal of system, smallerly not compressed or compressed in order to guarantee high peak-to-average force ratio signal, to avoid distorted signals, need to allow radio-frequency power amplifier under the scene with more rollback (back-off), work.So-called rollback refers to the power output of radio-frequency power amplifier less than the saturation power output of this radio-frequency power amplifier, and its size equals the poor of saturation power and power output.Too much rollback brings certain loss can for the efficient of radio-frequency power amplifier.
In order to guarantee enough rollbacks, can satisfy high efficiency requirement again, prior art has proposed to adopt asymmetric Da Hedi power amplifier (ADPA, Asymmetric Doherty Power Amplifier) technology namely adopts a plurality of different devices to make ADPA circuit (hereinafter referred to as ADPA equipment).For example, referring to Fig. 1, this ADPA circuit comprises main radio-frequency power amplifier 001, peak value radio-frequency power amplifier 002, power splitter 003, impedance inverter circuit 004 and Doherty combiner circuit 005, wherein, after 003 shunt of input signal process power splitter, enter radio-frequency power amplifier by the input impedance conversion circuit in the impedance inverter circuit 004, main radio-frequency power amplifier 001 and peak value radio-frequency power amplifier 002 all belong to the single channel device, main radio-frequency power amplifier 001 and peak value radio-frequency power amplifier 002 are respectively by the output impedance translation circuit in the impedance inverter circuit 004, connect with Doherty combiner circuit 005, Doherty combiner circuit 005 can be three port microstrip networks, and its each port Impedance value can be by the power decision of main radio-frequency power amplifier 001 and peak value radio-frequency power amplifier 002.
In the research and practice process to prior art, the present inventor finds, because ADPA equipment requires very high to two-way (i.e. main radio-frequency power amplifier 001 and peak value radio-frequency power amplifier 002) phase place, and there is discreteness in radio-frequency power amplifier itself, the discreteness of the radio-frequency power amplifier of different batches can be aggravated the phase difference of two-way greatly, cause the synthetic loss of power of ADPA equipment, have a strong impact on the performance of ADPA, and this discreteness only just can be found when using, and causes the performance of uncontrollable ADPA equipment.
Summary of the invention
The embodiment of the invention provides a kind of power amplifier, ADPA equipment and base station, can reduce discreteness guaranteeing to have the high efficiency while, improves the performance of power amplifier.
A kind of power amplifier comprises at least the separate and mutually different radio-frequency power amplification channel of two-way and has at least two inputs and at least two outputs;
Each road in the separate and mutually different radio-frequency power amplification channel of described at least two-way comprises the input that receives input signal, be used for radiofrequency signal is carried out the radiofrequency power amplification unit of power amplification and is used for the output of output signal;
The input of the separate and mutually different radio-frequency power amplification channel of described at least two-way is as the input of this power amplifier, and the separate and mutually different radio-frequency power amplification channel of described at least two-way output is as the output of this power amplifier.
A kind of asymmetric Da Hedi power amplification device comprises any one power amplifier that impedance inverter circuit and the embodiment of the invention provide;
Described impedance inverter circuit comprises input impedance conversion circuit and/or output impedance translation circuit, described input impedance conversion circuit and output impedance translation circuit are connected in series with input and the output of power amplifier respectively, are used for described power amplifier and other radio circuits are complementary.
The embodiment of the invention adopts different radio-frequency power amplification channels is concentrated on a device inside, consist of power amplifier, thereby can reduce by the mode of before device dispatches from the factory, testing and being screened the discreteness between the different radio frequency power amplification passage, avoid prior art only when using, could find the generation of the situation of the uncontrollable performance that the discreteness between the device causes, be conducive to improve the performance of ADPA equipment.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the schematic diagram of ADPA circuit of the prior art;
Fig. 2 is the schematic diagram of the power amplifier that provides of the embodiment of the invention;
Fig. 3 is another schematic diagram of the power amplifier that provides of the embodiment of the invention;
Fig. 4 is the schematic diagram of the ADPA equipment that provides of the embodiment of the invention;
Fig. 5 is another schematic diagram of the ADPA equipment that provides of the embodiment of the invention;
Fig. 6 is the structural representation of the radiofrequency power amplification unit that provides of the embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
The embodiment of the invention provides power amplifier, asymmetric Da Hedi power amplification device and comprises this power amplifier or the base station of this asymmetric Da Hedi power amplification device.Below be elaborated respectively.
A kind of power amplifier comprises at least separate and mutually different radio-frequency power amplification channel of two-way, and has at least two inputs and at least two outputs; Wherein, each way RF power amplification channel comprises respectively input, radiofrequency power amplification unit and output, the input of each way RF power amplification channel is all as the input of this power amplifier, all as the output of this power amplifier, radiofrequency power amplification unit is used for radiofrequency signal is carried out power amplification the output of each way RF power amplification channel.
In embodiments of the present invention, radiofrequency power amplification unit (Transistor) can comprise ring flange (Flange), active tube core (Die) and bonding line (Bonding Wire).Wherein, ring flange is the substrate of radio-frequency power amplification channel; Active tube core is used for radiofrequency signal is amplified, and bonding line is used for active tube core is connected with input or the output of radio-frequency power amplification channel.Further, radiofrequency power amplification unit can also comprise the circuit that pre-matching is provided, can comprise in embodiments of the present invention MOS capacitor (MOS capacitor or CMOS), be used for linking to each other by input or the output of bonding line with active tube core and radio-frequency power amplification channel, carry out the input of active tube core and radio-frequency power amplification channel or the pre-matching between the output.
Wherein, at least one in power capacity, size, semi-conducting material, progression, technique and the active tube core number etc. between the active tube core in per two way RF power amplification channels is different.Technique comprises employing field-effect transistor (FET, Field Effect Transistor) or bipolar junction transistor (BJT, Bipolar Junction Transistor) etc.
For example, referring to Fig. 2, this power amplifier 100 can comprise the first radiofrequency power amplification unit 101 and the second radiofrequency power amplification unit 102, and has two inputs and two outputs, and namely these power amplifier 100 inside have two passages.
Wherein, the first radiofrequency power amplification unit 101 and the second radiofrequency power amplification unit 102 are separate, the input of the input of the first radiofrequency power amplification unit 101 and the second radiofrequency power amplification unit 102 is as two inputs of this power amplifier 100, and the output of the output of the first radiofrequency power amplification unit 101 and the second radiofrequency power amplification unit 102 is then as two outputs of this power amplifier 100.
Wherein, the first radiofrequency power amplification unit 101 is identical with the progression of the second radiofrequency power amplification unit 102, is one-level, and power capacity, size, semi-conducting material, technique and active tube core number etc. are all not identical.Referring to Fig. 2, the first radiofrequency power amplification unit 101 power capacities are 50w, and size is less, and semi-conducting material is Laterally Diffused Metal Oxide Semiconductor (LDMOS), process using be FET, active tube core number is 1; The second radiofrequency power amplification unit 102 power capacities are 150w, and size is larger, and semi-conducting material is gallium nitride (GaN, Gallium Nitride), process using be BJT, active tube core number is 2.
Again for example, referring to Fig. 3, this power amplifier 200 can comprise the first radiofrequency power amplification unit 201, the second radiofrequency power amplification unit 202 and the 3rd radio frequency power amplification unit 203, and has three inputs and three outputs, and namely these power amplifier 200 inside have three passages.
Wherein, the first radiofrequency power amplification unit 201, the second radiofrequency power amplification unit 202 and the 3rd radio frequency power amplification unit 203 are separate, the input of the first radiofrequency power amplification unit 201, the input of the input of the second radiofrequency power amplification unit 202 and the 3rd radio frequency power amplification unit 203 is as three inputs of this power amplifier 200, and the output of the first radiofrequency power amplification unit 201, the output of the output of the second radiofrequency power amplification unit 202 and the 3rd radio frequency power amplification unit 203 is then as three outputs of this power amplifier 200.
Wherein, the first radiofrequency power amplification unit 201, the second radiofrequency power amplification unit 202 are identical with the progression of the 3rd radio frequency power amplification unit 203, are one-level, and power capacity, size, semi-conducting material, active tube core number etc. are all not identical, technique is identical, all adopts FET.Referring to Fig. 3, the first radiofrequency power amplification unit 201 power capacities are 50w, size is less, semi-conducting material is LDMOS, active tube core number is 1, and the second radiofrequency power amplification unit 202 and the 3rd radio frequency power amplification unit 203 sizes are larger, wherein, the semi-conducting material of the second radiofrequency power amplification unit 202 is GaN, and active tube core number is 1, and power capacity is 100w, the semi-conducting material of the 3rd radio frequency power amplification unit 203 is GaAs (GaAs, Gallium Arsenide), active tube core number is 2, and power capacity is 150w.
It should be noted that, only comprise take the inside of this power amplifier that below two or three passages describe as example, should be understood that, the inside of the power amplifier that the embodiment of the invention provides can also comprise the passage more than three, namely comprise the radiofrequency power amplification unit more than three tunnel, and, these radiofrequency power amplification unit can adopt different active tube cores according to the demand of practical application, such as employing different capacity capacity, different size, different number, different progression, different semi-conducting material and different process, etc.
As from the foregoing, the embodiment of the invention adopts different radiofrequency power amplification unit is concentrated on a device inside, consist of power amplifier, thereby can reduce by the mode of when producing, testing and being screened the discreteness between the different radio frequency power amplification unit, avoid prior art only when using, could find the generation of the uncontrollable situation of performance that the discreteness between the device causes; Because this power amplifier is single device, so when using, can guarantee to have lower discreteness, is conducive to boost device efficient, and improves the ADPA performance.
Further, only need to adopt the power amplifier that the embodiment of the invention provides, just can realize the effect that needs a plurality of independent radio-frequency power amplifiers to realize in the prior art, because this power amplifier is single device, so can be made into miniature device, for two independent radio-frequency power amplifiers of needs, can effectively reduce the fabric swatch area, but also can reduce cost.
Correspondingly, the embodiment of the invention also provides a kind of ADPA equipment, comprises any power amplifier that impedance inverter circuit, Doherty combiner circuit and the embodiment of the invention provide;
Wherein, input and/or the output of impedance inverter circuit and power amplifier are connected in series, and are used for so that this power amplifier and other devices (such as radio-frequency devices) can mate.The number of impedance inverter circuit can be decided according to the application demand of reality.Such as, impedance inverter circuit can comprise input impedance conversion circuit and output impedance translation circuit, and wherein, the input impedance conversion circuit links to each other with the input of power amplifier, and the output impedance translation circuit links to each other with the output of power amplifier.
Wherein, power amplifier be used for to receive input signal, input signal is carried out power amplification after, the signal after the output by power amplifier will amplify is exported to impedance inverter circuit.
Power amplifier can comprise at least separate and mutually different radio-frequency power amplification channel of two-way, can comprise main radio-frequency power amplification channel and peak value radio-frequency power amplification channel, such as, one the tunnel is main radio-frequency power amplification channel in the radio-frequency power amplification channel, and other passages are peak value radio-frequency power amplification channel.
The Doherty combiner circuit is used for each way RF power amplification channel output is linked to each other.The concrete formation of Doherty circuit can limit in embodiments of the present invention.Wherein, the Doherty combiner circuit can be the multiport microstrip network, its port number is by the number decision of the included radio-frequency power amplification channel of power amplifier, and the resistance value of its each port and phase lengths are by the power decision of each way RF power amplification channel.
Further, this ADPA equipment can also comprise power splitter;
Power splitter is used for input signal is divided into the not signal of homenergic, and is transferred to respectively each the way RF power amplification channel in the power amplifier.Wherein, this power splitter is specifically as follows electric bridge or microstrip power divider, can not limited in embodiments of the present invention.
For example, referring to Fig. 4, ADPA equipment comprises power splitter 301, input impedance conversion circuit 303, power amplifier 100, output impedance translation circuit 304 and Doherty combiner circuit 302;
Wherein, input signal enters input impedance conversion circuit 303 through power splitter 301.
Wherein, power amplifier 100 can comprise the first radiofrequency power amplification unit 101 and the second radiofrequency power amplification unit 102, and has two inputs and two outputs, and namely these power amplifier 100 inside have two passages.
Wherein, the first radiofrequency power amplification unit 101 and the second radiofrequency power amplification unit 102 are separate, the input of the input of the first radiofrequency power amplification unit 101 and the second radiofrequency power amplification unit 102 is as two inputs of this power amplifier 100, and links to each other with input impedance conversion circuit 303 respectively; The output of the output of the first radiofrequency power amplification unit 101 and the second radiofrequency power amplification unit 102 is then as two outputs of this power amplifier 100, and links to each other with output impedance translation circuit 304 respectively.
Wherein, the power capacity of the first radiofrequency power amplification unit 101 and the second radiofrequency power amplification unit 102, size, active tube core number, progression, semi-conducting material are different with in the technique at least one.
The first radiofrequency power amplification unit 101 is the main radiofrequency power amplification unit in the ADPA equipment, and the second radiofrequency power amplification unit 102 is the peak power amplifying unit in the ADPA equipment.
Because the power amplifier 100 in the embodiment of the invention can be an asymmetric device, so can satisfy different power ratio demands, such as, if require the power capacity of main radiofrequency power amplification unit and peak value radiofrequency power amplification unit than being 1:2, and, gross output is 150w, then can select power is that the radiofrequency power amplification unit of 50w is as main radiofrequency power amplification unit 101, and select power be the radiofrequency power amplification unit of 100w as peak value radiofrequency power amplification unit 102, etc.
Again for example, referring to Fig. 5, ADPA equipment comprises power splitter 401, power amplifier 200, input impedance conversion circuit 403, output impedance translation circuit 404 and Doherty combiner circuit 402;
This power amplifier 200 can comprise three way RF power amplification channels, be respectively the first radiofrequency power amplification unit 201, the second radiofrequency power amplification unit 202 and the 3rd radio frequency power amplification unit 203, and have three inputs and three outputs, namely these power amplifier 200 inside have three passages.
Wherein, input signal enters input impedance conversion circuit 403 through power splitter 401, after three way RF power amplification channels of process power amplifier 200 carry out power amplification, enter output impedance translation circuit 404, and then by the 402 rear outputs of Doherty combiner circuit;
Wherein, the first radiofrequency power amplification unit 201, the second radiofrequency power amplification unit 202 and the 3rd radio frequency power amplification unit 203 are separate, the input of the input of the input of the first radiofrequency power amplification unit 201, the second radiofrequency power amplification unit 202 and the 3rd radio frequency power amplification unit 203 links to each other with input impedance conversion circuit 403 respectively as three inputs of this power amplifier 200; The output of the output of the output of the first radiofrequency power amplification unit 201, the second radiofrequency power amplification unit 202 and the 3rd radio frequency power amplification unit 203 is then as three outputs of this power amplifier 200, wherein, the output of the output of the output of the first radiofrequency power amplification unit 201, the second radiofrequency power amplification unit 202 and the 3rd radio frequency power amplification unit 203 links to each other with output impedance translation circuit 404 respectively.
Wherein, the power capacity of the first radiofrequency power amplification unit 201, the second radiofrequency power amplification unit 202 and the 3rd radio frequency power amplification unit 203, size, active tube core number, progression, semi-conducting material are different with in the technique at least one.
The first radiofrequency power amplification unit 201 can be the main radiofrequency power amplification unit of this ADPA equipment, and the second radiofrequency power amplification unit 202 and the 3rd radio frequency power amplification unit 203 can be the peak value radiofrequency power amplification unit of this ADPA equipment.
As shown in Figure 6, radiofrequency power amplification unit in the embodiment of the invention (Transistor) can be by ring flange 601(Flange), active tube core 602 (Die) and bonding line 603(Bonding Wire) form, can also comprise the pre-matching circuit, in embodiments of the present invention, this pre-matching circuit can comprise MOS capacitor (MOS capacitor).
Fig. 6 a1 is the side schematic view of the radiofrequency power amplification unit a that is comprised of ring flange 6011, active tube core 6012 and bonding line 6013, and Fig. 6 a2 is the schematic top plan view of this radiofrequency power amplification unit a; Active tube core 6012 links to each other by input and the output of bonding line 6013 and this radiofrequency power amplification unit respectively.
Fig. 6 b1 is the side schematic view of the radiofrequency power amplification unit b that is comprised of ring flange 6021, active tube core 6022, bonding line 6023 and MOS capacitor 6024, figure b2 is the schematic top plan view of this radiofrequency power amplification unit b, wherein the pre-matching between the input of bonding line 6023 and MOS capacitor 6024 these radiofrequency power amplification unit of composition and radio-frequency power amplification channel;
Fig. 6 c is the side schematic view that is made of radiofrequency power amplification unit c ring flange 6031, active tube core 6032, bonding line 6033 and MOS capacitor 6034, wherein the pre-matching between the output of bonding line 6033 and MOS capacitor 6034 these radiofrequency power amplification unit of composition and this radio-frequency power amplification channel;
Fig. 6 d is the side schematic view of the radiofrequency power amplification unit d that is comprised of ring flange 6041, active tube core 6042, bonding line 6043 and MOS capacitor 6044, and wherein bonding line 6043 and MOS capacitor 6044 form respectively the input of this radiofrequency power amplification unit and radio-frequency power amplification channel or the pre-matching of output;
Fig. 6 e is that the number of active tube core 6052 is 2 o'clock, the schematic top plan view of the radiofrequency power amplification unit e that is comprised of ring flange 6051, active tube core 6052 and bonding line 6053.
It should be noted that, only comprise take the inside of this power amplifier that below two or three passages describe as example, should be understood that, the inside of the power amplifier that the embodiment of the invention provides can also comprise the passage more than three, namely comprises the radiofrequency power amplification unit more than three; In addition, the annexation between power splitter, power amplifier and the impedance inverter circuit can also according to the demand otherwise designed of practical application, not repeat them here except Fig. 4 and connection that Fig. 5 is connected.
As from the foregoing, power amplifier in the ADPA equipment of the embodiment of the invention is a kind of asymmetric device, its inside can include the different radio-frequency power amplification channel of multichannel, thereby can in realizing prior art, need in the effect that a plurality of independently radio-frequency power amplifiers could realize, reduce the discreteness between device, be conducive to boost device efficient, and the performance that improves whole ADPA equipment.
Further, because this power amplifier is single device, so can be made into a small-sized device, for two independent radio-frequency power amplifiers of needs, can effectively reduce the fabric swatch area, and with respect to needs radiofrequency power amplification unit is encapsulated respectively, concentrate be packaged into a device the material consumption meeting more still less, be conducive to reduce cost.
The embodiment of the invention also provides a kind of base station, comprises any one included in embodiment of the invention power amplifier, perhaps any one ADPA equipment.
Above a kind of power amplifier, asymmetric Da Hedi power amplification device and the base station that the embodiment of the invention is provided is described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. a power amplifier is characterized in that,
Comprise at least the separate and mutually different radio-frequency power amplification channel of two-way and have at least two inputs and at least two outputs;
Each road in the separate and mutually different radio-frequency power amplification channel of described at least two-way comprises the input that receives input signal, be used for radiofrequency signal is carried out the radiofrequency power amplification unit of power amplification and is used for the output of output signal;
The input of the separate and mutually different radio-frequency power amplification channel of described at least two-way is as the input of this power amplifier, and the separate and mutually different radio-frequency power amplification channel of described at least two-way output is as the output of this power amplifier.
2. power amplifier according to claim 1 is characterized in that,
Described radiofrequency power amplification unit (Transistor) for radiofrequency signal being carried out power amplification includes source capsule core (Die), bonding line (Bonding Wire) and ring flange (Flange);
Described separate and mutually different radio-frequency power amplification channel comprises mutually different radiofrequency power amplification unit, wherein,
Described mutually different radiofrequency power amplification unit is that in power capacity, size, semi-conducting material, progression, technique and the active tube core number of the included active tube core of every two-way radiofrequency power amplification unit at least one is different.
3. power amplifier according to claim 1 and 2 is characterized in that,
Described radiofrequency power amplification unit (Transistor) for radiofrequency signal being carried out power amplification also comprises the circuit that pre-matching is provided, be used for linking to each other with described active tube core by described bonding line, and link to each other with input or the output of described radio-frequency power amplification channel by described bonding line, the input of described active tube core and described radio-frequency power amplification channel or the pre-matching between the output are provided.
4. power amplifier according to claim 3 is characterized in that, the described circuit of pre-matching that provides comprises MOS capacitor.
5. an asymmetric Da Hedi power amplification (ADPA) equipment is characterized in that, comprises the described power amplifier of impedance inverter circuit and claim 1 to 4 any one;
Described impedance inverter circuit comprises input impedance conversion circuit and/or output impedance translation circuit, described input impedance conversion circuit and output impedance translation circuit are connected in series with input and the output of power amplifier respectively, are used for described power amplifier and other radio circuits are complementary.
6. asymmetric Da Hedi power amplification device according to claim 5 is characterized in that, also comprises Da Hedi (Doherty) combiner circuit, and the output that is used for each way RF power amplification channel that described power amplifier is included links to each other.
7. the asymmetric Da Hedi power amplification device of its feature according to claim 6, it is characterized in that, described Doherty combiner circuit is the multiport microstrip network, its port number is by the number decision of the included radio-frequency power amplification channel of described power amplifier, and the resistance value of its each port and phase lengths are by the power decision of described each way RF power amplification channel.
8. according to claim 5 or 6 or 7 described asymmetric Da Hedi power amplification devices, it is characterized in that, also comprise power splitter, be used for input signal is divided into the not signal of homenergic, and be transferred to respectively each the way RF power amplification channel in the power amplifier.
9. asymmetric Da Hedi power amplification device according to claim 7 is characterized in that, described power splitter is electric bridge or microstrip power divider.
10. a base station is characterized in that, comprises such as the described power amplifier of claim 1 to 4 any one, perhaps, comprises such as the described asymmetric Da Hedi power amplification device of claim 5 to 9 any one.
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| CN2013102603992A CN103326678A (en) | 2010-09-14 | 2010-09-14 | Power amplifier, asymmetric Doherty power amplifier equipment and base station |
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| CN2013102603992A CN103326678A (en) | 2010-09-14 | 2010-09-14 | Power amplifier, asymmetric Doherty power amplifier equipment and base station |
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| CN2010102813164A Division CN102130657A (en) | 2010-09-14 | 2010-09-14 | Power amplifier, asymmetric Doherty power amplifier equipment and base station |
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| WO2015139311A1 (en) * | 2014-03-21 | 2015-09-24 | 华为技术有限公司 | Power amplification circuit and transmitter |
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