CN102394569A - Efficient Doherty power amplifier - Google Patents
Efficient Doherty power amplifier Download PDFInfo
- Publication number
- CN102394569A CN102394569A CN2011103408428A CN201110340842A CN102394569A CN 102394569 A CN102394569 A CN 102394569A CN 2011103408428 A CN2011103408428 A CN 2011103408428A CN 201110340842 A CN201110340842 A CN 201110340842A CN 102394569 A CN102394569 A CN 102394569A
- Authority
- CN
- China
- Prior art keywords
- power amplifier
- electric bridge
- merit
- doherty
- amplifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention discloses an efficient Doherty power amplifier, which comprises a driving power amplifier and a final power amplifier; the driving power amplifier has a balanced amplifying structure composed of a power dividing bridge 1, a driving power amplifier 2, a nonlinear network 1, a combiner 1 and a load; and the final power amplifier has a Doherty amplifying structure composed of a power dividing bridge 2, a nonlinear network 2, a carrier power amplifier, a peak power amplifier and a combiner 2. The driving power amplifier 1 and the driving amplifier 2 both work in type B bias, so the linearity and effectiveness of driving power amplifier can be improved. The carrier power amplifier works in type B bias; and the peak power amplifier works in type C bias and utilizes asymmetrical Doherty structure, so the efficiency of final power amplifier in reduction of 8dB is greatly improved. The efficient Doherty power amplifier has the advantages that the driving power amplifier and the final power amplifier are both efficient in working states, which can efficiently amplify the peak-to-average ratio. Meanwhile, uniformity of batch production of such efficient Doherty power amplifier can be greatly improved by adding the nonlinear matching network in the separating end of the power distributing bridge in the Doherty structure.
Description
Technical field
The present invention relates to moving communicating field, mainly is a kind of high efficiency Doherty power amplifier.
Background technology
Current, energy-saving and cost-reducing is the focus in the whole world.It is green product that mobile communication product also requires.The height of communication products efficient directly has influence on the index such as cost, performance, volume of communication products, also is the core competitiveness of product.The energy consumption of radio-frequency power amplifier in the base station, more than 60% of repeater overall energy consumption.So improving the efficient of radio-frequency power amplifier is the focus and the difficult point in this field.Doherty amplifier technology is to raise the efficiency otherwise effective technique at present.Traditional Doherty amplifier be by two same type package independently amplifier tube do carrier power amplifier and peak power amplifier.Because the discreteness of device causes the input standing wave of carrier power amplifier and peak value power amplifier different, amplitude and phase place do not match when causing two branch road power outputs synthetic, can serious linearity and the efficiency index that reduces whole power amplifier.Consistency when influence is produced in batches.
Summary of the invention
The object of the invention will overcome the deficiency of above-mentioned technology just, and a kind of high efficiency Doherty power amplifier is provided, and promptly a kind of radio-frequency power amplifier of Doherty efficiently can effectively improve the efficient of radio-frequency power amplifier.The isolation end of power division electric bridge increases the non-linear matches network in the Doherty structure simultaneously, can improve the consistency of batch process greatly.
Technical problem to be solved by this invention is linearity and the efficiency index that the discreteness of power tube influences radio-frequency power amplifier.
The present invention solves the technical scheme that its technical problem adopts: this high efficiency Doherty power amplifier; Comprise driving power amplifier and final stage power amplifier, wherein drive power amplifier and divide electric bridge 1, drive power amplifier 1, drive power amplifier 2, nonlinear network 1, mixer 1 and load Compositional balance structure for amplifying by merit; Final stage power amplifier divides electric bridge 2, nonlinear network 2, carrier power amplifier, peak value power amplifier and mixer 2 to form the Doherty structure for amplifying by merit; The carrier power amplifier input divides the in-phase output end of electric bridge 2 to link to each other with merit, and peak value power amplifier input divides 90 degree phase shifter output terminals of electric bridge 2 to link to each other with merit; Described driving power amplifier 1, drive power amplifier 2 and carrier power amplifier, realize through the LDMOS amplifier tube, and be biased in the category-B magnifying state, drive power amplifier 1 and drive power amplifier 2 and have the same radio-frequency performance, that is to say it is to manage realization by same LDMOS.Described peak value power amplifier is realized through the LDMOS amplifier tube, and is biased in C class magnifying state, and the saturation power of peak value power amplifier approximately is 1.5 times of saturation power of carrier power amplifier, can guarantee that like this power amplifier has very high efficient when rollback 8dB.Nonlinear network 1 divides the isolation end of electric bridge 1 to link to each other with merit, and nonlinear network 2 divides the isolation end of electric bridge 2 to link to each other with merit; Said load is realized by 50 Ohmic resistances, links to each other with the isolation end of mixer 1.Drive power amplifier 1 and all be operated in the category-B biasing, can improve the linearity and the efficient performance that drive power amplifier like this with driving power amplifier 2.Carrier power amplifier is operated in the category-B biasing, and its peak work is put and is operated in the biasing of C class, and adopts asymmetric Doherty structure, improves final stage power amplifier efficient when the 8dB rollback greatly.Drive power amplifier and final stage power amplifier and all be in the efficiency operation state, realize the high efficiency of high PAR peak to average ratio signal is amplified.The isolation end of power division electric bridge increases the non-linear matches network in the Doherty structure simultaneously, can improve the consistency of batch process greatly.
Described driving power amplifier 1 is used for one tunnel radiofrequency signal constant power is divided into the two-way radiofrequency signal that phase shift differs 90 degree with driving power amplifier 2.
The nonlinear network that described nonlinear network 1 and nonlinear network 2 are made up of electric capacity, resistance and 50 ohm microstrip.Nonlinear network 1 divides with merit that the isolation end of electric bridge 1 links to each other, nonlinear network 2 divides the isolation end of electric bridge 2 to link to each other with merit.The impedance of nonlinear network is different, makes merit divide the power-division ratios of electric bridge and phase shift difference also different.
Described mixer 1 is realized by the 3dB electric bridge, is used for the radiofrequency signal power that two-way power equates, phase shift differs 90 degree is synthesized to one tunnel radiofrequency signal.
The power that described mixer 2 is used for final stage power amplifier two-way radiofrequency signal synthesizes, and also has the function of impedance conversion, when the peak value power amplifier is closed, transforms to 120 ohm to the output impedance of carrier power amplifier; When the peak value power amplifier is opened fully, transform to 50 ohm to the output impedance of carrier power amplifier.
Described driving power amplifier, LDMOS amplifier tube bias are taken into account radiofrequency characteristicses such as linear and efficient at the balance structure for amplifying of category-B.Drive power amplifier 1 and the amplitude and the phase difference that drive power amplifier 2 input end signals through changing the impedance of nonlinear network 1, change to be assigned to, can remedy the discreteness of each radio-frequency devices, make the driving power amplifier of balance structure for amplifying reach optimum performance.
Described final stage power amplifier adopts asymmetric Doherty structure.The carrier power amplifier input divides the in-phase output end of electric bridge 2 to link to each other with merit, and peak value power amplifier input divides 90 degree phase shifter output terminals of electric bridge 2 to link to each other with merit.Through changing the impedance of nonlinear network 2, change the amplitude and the phase difference that are assigned to carrier power amplifier and peak value power amplifier input end signal, can remedy the discreteness of each radio-frequency devices, make final stage power amplifier reach optimum performance.
The effect that the present invention is useful is: the present invention proposes a kind of efficient Doherty power amplifier, can effectively improve the efficient of radio-frequency power amplifier.The isolation end of power division electric bridge increases the non-linear matches network in the Doherty structure simultaneously, can improve the consistency of batch process greatly, saves production cost.
Description of drawings
Accompanying drawing 1 is a principle of the invention block diagram;
Accompanying drawing 2 is that the present invention drives the power amplifier theory diagram;
Accompanying drawing 3 is final stage power amplifier theory diagrams of the present invention.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer, reach for example below in conjunction with accompanying drawing, the present invention is further elaborated.Should be appreciated that described hereinly, and be not used in qualification the present invention for example only in order to explaining the present invention.
The present invention is a kind of high efficiency Doherty power amplifier, comprises driving power amplifier and final stage power amplifier.Wherein driving power amplifier is divided electric bridge 1, drives power amplifier 1, is driven power amplifier 2, nonlinear network 1, mixer 1 and load Compositional balance structure for amplifying by merit; Final stage power amplifier divides electric bridge 2, nonlinear network 2, carrier power amplifier, peak value power amplifier and mixer 2 to form the Doherty structure for amplifying by merit.Drive power amplifier 1 and all be operated in the category-B biasing, can improve the linearity and the efficient performance that drive power amplifier like this with driving power amplifier 2.Carrier power amplifier is operated in the category-B biasing, and its peak work is put and is operated in the biasing of C class, and adopts asymmetric Doherty structure, improves final stage power amplifier efficient when the 8dB rollback greatly.Drive power amplifier and final stage power amplifier and all be in the efficiency operation state, realize the high efficiency of high PAR peak to average ratio signal is amplified.
Drive power amplifier and adopt balance structure for amplifying (shown in the accompanying drawing 2).Merit divides electric bridge 1 that one tunnel radiofrequency signal constant power is divided into the two-way radiofrequency signal that phase shift differs 90 degree.Merit divides the in-phase output end of electric bridge 1 to link to each other with the input that drives power amplifier 2, and merit divides 90 degree phase shifter output terminals of electric bridge 1 to link to each other with the input that drives power amplifier 1.Drive power amplifier 1 and realize having the same radio-frequency performance by the LDMOS amplifier tube of same model with driving power amplifier 2.Drive power amplifier 1, driving power amplifier 1 and driving power amplifier 2 and be biased in category-B, can effectively improve the efficient that drives power amplifier.Mixer 1 is realized by the 3dB electric bridge, is synthesized to one tunnel radiofrequency signal with driving the radiofrequency signal power that two branch road roads of power amplifier power equates, phase shift differs 90 degree.Drive the output of power amplifier 1 and the in-phase input end of mixer 1 and link to each other, drive the output of power amplifier 2 and 90 degree phase shift inputs of mixer 2 and link to each other isolation termination 50 ohm of mixer 1.Because the LDMOS amplifier tube that drive power amplifier 1, drives power amplifier 2 has discreteness, their input standing wave can be variant during batch process, influences power division and two branch road phase-shift characterisitcs that merit is divided electric bridge 1, so divide the isolation termination nonlinear network 1 of electric bridge 1 in merit.Nonlinear network 1 is made up of 50 ohm microstrip, resistance, electric capacity.The length of change microstrip line, the size of resistance capacitance just can change power division and the phase shift difference that merit is divided 1 liang of output branch road of electric bridge, thereby the accurate coupling of realization and two branch road LDMOS amplifier tubes improves performance.Drive power amplifier and adopt the balance structure for amplifying, the input and output standing wave that can also effectively guarantee to drive power amplifier is good, reduces the difficulty of interstage matched, enhances productivity.
Final stage power amplifier (shown in accompanying drawing 3) adopts asymmetric Doherty structure.The output radiofrequency signal constant power that merit divides electric bridge 2 will drive power amplifier is divided into the two-way radiofrequency signal that phase shift differs 90 degree.Merit divides the in-phase output end of electric bridge 2 to link to each other with the input of carrier power amplifier, and merit divides the 90 degree phase shifter output terminals of electric bridge 2 and the input of peak value power amplifier to link to each other.Carrier power amplifier and peak value power amplifier all are to realize through the LDMOS amplifier tube.The category-B magnifying state of carrier power amplifier biasing, the peak value power amplifier is biased in C class magnifying state.The saturation power of peak value power amplifier approximately is 1.5 times of saturation power of carrier power amplifier, can guarantee that like this power amplifier has very high efficient when rollback 8dB.Such as the saturation power of carrier power amplifier is C, and the saturation power of peak value power amplifier is P, and the back-off point that then has peak efficiency is 20 * log ((P+C)/C).Mixer 2 is made up of two sections quarter-wave microstrip lines, and one section is 50 ohmages, and another section is 32 ohmages, realizes that the power of two branch road radiofrequency signals of final stage power amplifier is synthetic, also has the function of impedance conversion.When the peak value power amplifier was closed, two sections quarter-wave microstrip lines transformed to 120 ohm to the output impedance of carrier power amplifier; When the peak value power amplifier is opened fully, transform to 50 ohm to the output impedance of carrier power amplifier.Because the LDMOS amplifier tube of carrier power amplifier, peak value power amplifier has discreteness, their input standing wave can be variant during batch process, influences power division and two branch road phase-shift characterisitcs that merit is divided electric bridge 2, so divide the isolation termination nonlinear network 2 of electric bridge 2 in merit.Nonlinear network 2 is made up of 50 ohm microstrip, resistance, electric capacity.The length of change microstrip line, the size of resistance capacitance just can change power division and the phase shift difference that merit is divided 2 liang of output branch roads of electric bridge; Thereby make carrier power amplifier branch road and peak value power amplifier branch road when power is synthetic, have accurate amplitude and phase matched, improve the linearity and the efficient performance of final stage power amplifier.
Driving the output of power amplifier and the input of final stage power amplifier all is 3dB power amplifier electric bridge, can guarantee effectively that the standing wave of port is good separately.Just need not increase extra isolator does not guarantee that interstage matched is good between driving power amplifier and final stage power amplifier like this, can reduce cost.
It is understandable that, for a person skilled in the art, technical scheme of the present invention and inventive concept are equal to replacement or change the protection range that all should belong to the appended claim of the present invention.
Claims (5)
1. a high efficiency Doherty power amplifier is characterized in that: comprise driving power amplifier and final stage power amplifier, wherein drive power amplifier and divided electric bridge 1, drive power amplifier 1, driven power amplifier 2, nonlinear network 1, mixer 1 and load Compositional balance structure for amplifying by merit; Final stage power amplifier divides electric bridge 2, nonlinear network 2, carrier power amplifier, peak value power amplifier and mixer 2 to form the Doherty structure for amplifying by merit; The carrier power amplifier input divides the in-phase output end of electric bridge 2 to link to each other with merit, and peak value power amplifier input divides 90 degree phase shifter output terminals of electric bridge 2 to link to each other with merit; Described driving power amplifier 1, drive power amplifier 2 and carrier power amplifier, realize through the LDMOS amplifier tube, and be biased in the category-B magnifying state; Described peak value power amplifier is realized through the LDMOS amplifier tube, and is biased in C class magnifying state; Nonlinear network 1 divides the isolation end of electric bridge 1 to link to each other with merit, and nonlinear network 2 divides the isolation end of electric bridge 2 to link to each other with merit; Said load links to each other with the isolation end of mixer 1.
2. high efficiency Doherty power amplifier according to claim 1 is characterized in that: described driving power amplifier 1 is used for one tunnel radiofrequency signal constant power is divided into the two-way radiofrequency signal that phase shift differs 90 degree with driving power amplifier 2.
3. high efficiency Doherty power amplifier according to claim 1 is characterized in that: the nonlinear network that described nonlinear network 1 and nonlinear network 2 are made up of electric capacity, resistance and 50 ohm microstrip.
4. high efficiency Doherty power amplifier according to claim 1 is characterized in that: described mixer 1 is realized by the 3dB electric bridge, is used for the radiofrequency signal power that two-way power equates, phase shift differs 90 degree is synthesized to one tunnel radiofrequency signal.
5. high efficiency Doherty power amplifier according to claim 1 is characterized in that: the power that described mixer 2 is used for final stage power amplifier two-way radiofrequency signal synthesizes, and when the peak value power amplifier is closed, transforms to 120 ohm to the output impedance of carrier power amplifier; When the peak value power amplifier is opened fully, transform to 50 ohm to the output impedance of carrier power amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103408428A CN102394569A (en) | 2011-11-02 | 2011-11-02 | Efficient Doherty power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103408428A CN102394569A (en) | 2011-11-02 | 2011-11-02 | Efficient Doherty power amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102394569A true CN102394569A (en) | 2012-03-28 |
Family
ID=45861785
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011103408428A Pending CN102394569A (en) | 2011-11-02 | 2011-11-02 | Efficient Doherty power amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102394569A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102801392A (en) * | 2012-09-13 | 2012-11-28 | 电子科技大学 | Radio frequency power amplification device |
| CN103580611A (en) * | 2012-08-10 | 2014-02-12 | 中兴通讯股份有限公司 | Power amplification device and wireless equipment |
| CN104104335A (en) * | 2014-07-04 | 2014-10-15 | 三维通信股份有限公司 | Method for widening video bandwidths of doherty power amplifiers in TDD (time division duplex) modes and video bandwidth enhancing power amplifier |
| CN108093678A (en) * | 2015-07-01 | 2018-05-29 | 瑞典爱立信有限公司 | B/C class Doherty power amplifiers |
| CN109274339A (en) * | 2018-10-18 | 2019-01-25 | 成都嘉纳海威科技有限责任公司 | A kind of Doherty driving Doherty power amplifier |
| CN109951166A (en) * | 2019-03-04 | 2019-06-28 | 湖北楚航电子科技有限公司 | A kind of microwave power amplification method and device |
| WO2020107390A1 (en) * | 2018-11-30 | 2020-06-04 | 华为技术有限公司 | Power amplifier circuit |
| CN114389544B (en) * | 2020-10-21 | 2024-04-30 | 苏州华太电子技术股份有限公司 | Doherty power amplifier and electronic device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101106358A (en) * | 2007-08-01 | 2008-01-16 | 锐迪科无线通信技术（上海）有限公司 | Linear RF power amplifier circuit and its optimization method |
| CN101350599A (en) * | 2008-08-25 | 2009-01-21 | 华为技术有限公司 | Method, apparatus and base station for amplifying power |
| CN102158190A (en) * | 2011-04-29 | 2011-08-17 | 中兴通讯股份有限公司 | Doherty power amplifier and implementation method thereof |
| CN102185564A (en) * | 2011-04-29 | 2011-09-14 | 中兴通讯股份有限公司 | Power amplifier and power amplifier circuit |
-
2011
- 2011-11-02 CN CN2011103408428A patent/CN102394569A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101106358A (en) * | 2007-08-01 | 2008-01-16 | 锐迪科无线通信技术（上海）有限公司 | Linear RF power amplifier circuit and its optimization method |
| CN101350599A (en) * | 2008-08-25 | 2009-01-21 | 华为技术有限公司 | Method, apparatus and base station for amplifying power |
| CN102158190A (en) * | 2011-04-29 | 2011-08-17 | 中兴通讯股份有限公司 | Doherty power amplifier and implementation method thereof |
| CN102185564A (en) * | 2011-04-29 | 2011-09-14 | 中兴通讯股份有限公司 | Power amplifier and power amplifier circuit |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103580611A (en) * | 2012-08-10 | 2014-02-12 | 中兴通讯股份有限公司 | Power amplification device and wireless equipment |
| CN102801392A (en) * | 2012-09-13 | 2012-11-28 | 电子科技大学 | Radio frequency power amplification device |
| CN102801392B (en) * | 2012-09-13 | 2015-03-11 | 电子科技大学 | Radio frequency power amplification device |
| CN104104335A (en) * | 2014-07-04 | 2014-10-15 | 三维通信股份有限公司 | Method for widening video bandwidths of doherty power amplifiers in TDD (time division duplex) modes and video bandwidth enhancing power amplifier |
| CN108093678A (en) * | 2015-07-01 | 2018-05-29 | 瑞典爱立信有限公司 | B/C class Doherty power amplifiers |
| CN109274339A (en) * | 2018-10-18 | 2019-01-25 | 成都嘉纳海威科技有限责任公司 | A kind of Doherty driving Doherty power amplifier |
| WO2020107390A1 (en) * | 2018-11-30 | 2020-06-04 | 华为技术有限公司 | Power amplifier circuit |
| CN112771778A (en) * | 2018-11-30 | 2021-05-07 | 华为技术有限公司 | Power amplifier circuit |
| CN109951166A (en) * | 2019-03-04 | 2019-06-28 | 湖北楚航电子科技有限公司 | A kind of microwave power amplification method and device |
| CN114389544B (en) * | 2020-10-21 | 2024-04-30 | 苏州华太电子技术股份有限公司 | Doherty power amplifier and electronic device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102394569A (en) | Efficient Doherty power amplifier | |
| CN103178787B (en) | N way Doherty amplifier | |
| CN102986134B (en) | A kind of many Hulls carry Doherty power amplifier and signal processing method | |
| CN102761310B (en) | Doherty power amplifier and implementation method thereof | |
| CN102545788A (en) | Multi-way asymmetrical Doherty amplifier | |
| CN103430603B (en) | power amplifier, transceiver and base station | |
| CN102801387A (en) | Dual-mode dual-band high-efficiency Doherty power amplifier | |
| CN102355198A (en) | Multi-path asymmetrical Doherty power amplifier | |
| WO2012146001A1 (en) | Doherty amplifier device | |
| US20140035679A1 (en) | Power Amplifier Device and Power Amplifier Circuit Thereof | |
| CN104113286B (en) | A kind of Doherty power amplification circuits | |
| US8754709B2 (en) | Doherty power amplifier and implementation method thereof | |
| CN102158190A (en) | Doherty power amplifier and implementation method thereof | |
| CN103199798B (en) | A kind of Doherty amplifying circuit and power amplifier | |
| CN102594266A (en) | Multi-stage multi-channel Doherty amplifier | |
| CN107231131A (en) | A kind of Doherty power amplifier for increasing back-off scope | |
| CN104393843A (en) | Doherty power amplifier adopting multistage auxiliary circuit amplifier | |
| CN203151433U (en) | Double-frequency synchronous power amplifier based on T-type network and coupling line | |
| CN104917468A (en) | Three-path reverse Doherty power amplifier and implementation method | |
| CN202535310U (en) | Multistep multi-way Doherty amplifier | |
| US8797099B2 (en) | Power amplifier device and power amplifier circuit thereof | |
| CN202475368U (en) | High-efficiency Doherty power amplifier | |
| CN105308857A (en) | Doherty power amplifier and transmitter | |
| CN103326671A (en) | Wideband efficient Doherty power amplifier suitable for low frequency range | |
| CN207399144U (en) | A kind of broadband Doherty power amplifier |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20120328 |