CN106374863B - A kind of Doherty power amplifier and its implementation improving back-off dynamic range - Google Patents
A kind of Doherty power amplifier and its implementation improving back-off dynamic range Download PDFInfo
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- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/04—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in discharge-tube amplifiers
- H03F1/06—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in discharge-tube amplifiers to raise the efficiency of amplifying modulated radio frequency waves; to raise the efficiency of amplifiers acting also as modulators
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Abstract
The present invention provides a kind of Doherty power amplifier and its implementation for improving back-off dynamic range, including equal part Wilkinson power divider, carrier power amplifying circuit, peak power amplifying circuit and novel load modulating network, wherein, equal part Wilkinson power divider is used to after input power is carried out equal part exported respectively to carrier power amplifying circuit and peak power amplifying circuit, the output of carrier power amplifying circuit terminates 86.6 Europe quarter wavelength impedance transducer T1, and it is connected with the output end of peak power amplifying circuit and exports power combiner to load.Compared with the existing technology, the present invention increases the load impedance of main power amplifier under low input power state, improves the high efficiency back-off range of Doherty power amplifier by the load modulation network of the traditional Doherty power amplifier of improvement.
Description
Technical field
The present invention relates to radio-frequency communication technical field more particularly to a kind of Doherty for improving back-off dynamic range
Power amplifier and its implementation.
Background technique
With the rapid development of wireless communication technique, frequency microwave technology is more and more important in people's daily life.
In order to transmit data volume as big as possible in limited spectral bandwidth, communication quotient generallys use extremely complex modulation system,
And this peak-to-average force ratio (PAPR) that will lead to signal becomes larger, and traditional power amplifier such as A class, AB class is used to believe non-permanent envelope
It is very low number to amplify efficiency, especially when high-power rollback.The radio-frequency power for taking into account high efficiency and high linearity is put
Big device becomes one of academia and the research hotspot of industry.Doherty power amplifier is because of energy high efficiency amplifier modulated signal
And cost is relatively low and becomes the current dominant form for wirelessly communicating used power amplifier.One typical two-way Doherty
Power amplifier includes major-minor two power amplifiers, and signal is divided into two defeated respectively by major-minor power amplifier input terminal by power splitter
Enter, signal is combined by a load modulation network and is exported by output end, according to the major-minor function of size dynamic modulation of input signal
The payload impedance of rate amplifier, so that Doherty power amplifier be made still to have in the case where output power significantly retracts
Very high efficiency.
But with the fast development of the communication technology, modulation system is also all the more complicated, traditional two-way Doherty power amplification
The range of device back-off 6dB is no longer satisfied the requirement of current wireless communication system, and therefore, urgent need develops novel Gao Gong
The Doherty power amplifier of rate rollback range is to meet the requirement of current and future wireless communication system high-transmission digit rate.It is high
The Doherty power amplifier of the back-off range also natural hot spot for becoming academia and industry research.
In order to improve the back-off range of Doherty power amplifier, communication quotient generally use asymmetric crystal
Pipe, i.e. peak value the power amplifier pipe bigger using power capacity, while in input terminal using the power splitter of not equal part, to improve power
Rollback range, but this can introduce new problem, and such as entirety Doherty power amplifier gain reduction reduces pipeline utilization factors etc., especially
It is in low input power.Therefore, the back-off model of Doherty power amplifier is further increased under symmetrical structure
Enclosing is this field technical problem urgently to be resolved.
Therefore for drawbacks described above present in currently available technology, it is really necessary to be studied, to provide a kind of scheme,
Solve defect existing in the prior art.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of Doherty power for improving back-off dynamic range to put
Big device increases main power amplifier under low input power state by improving the load modulation network of traditional Doherty power amplifier
Load impedance improves the high efficiency back-off range of Doherty power amplifier.
In order to overcome the drawbacks of the prior art, the invention adopts the following technical scheme:
A kind of Doherty power amplifier improving back-off dynamic range, including equal part Wilkinson power divider, load
Wave power amplifying circuit, peak power amplifying circuit and novel load modulating network, wherein the Wilkinson power divider is used for
It is exported respectively after input power is carried out equal part to the carrier power amplifying circuit and peak power amplifying circuit, the carrier wave
The output power of power amplification circuit and peak power amplifying circuit is exported after the novel load modulating network to load；
The impedance of the load is 50 ohm；The novel load modulating network uses the quarter-wave resistance in 86.6 Europe
Resistance parallel operation T1；The output end of the carrier power amplifying circuit is connected with one end of the impedance transformer T1, the resistance
The other end of resistance parallel operation T1 is connected with the output end of the peak power amplifying circuit, and one end with the load jointly
It is connected, the other end ground connection of the load；
The carrier power amplifying circuit includes carrier wave input matching circuit, Carrier Power Amplifier and the load being sequentially connected in series
Wave output matching circuit debugs what the carrier wave output matching circuit made the carrier power amplifying circuit in low input power
Load impedance is 150 Europe and the load impedance in high input power is 50 Europe；The peak power amplifying circuit includes successively
Peak value input matching circuit, peak power amplifier and peak value output matching circuit are concatenated, the peak value output matching electricity is debugged
Road makes load impedance 75 Europe of the peak power amplifying circuit in high input power, while exporting and matching in the peak value
Integrated setting compensating line keeps load impedance of the peak power amplifying circuit in low input power infinitely great in circuit.
Preferably, the compensating line is 75 Europe.
Preferably, the front end of the peak value input matching circuit is additionally provided with the quarter-wave delay line phase in 50 Europe.
Preferably, the Carrier Power Amplifier is AB power-like amplifier.
Preferably, the Carrier Power Amplifier is realized using transistor.
Preferably, the peak power amplifier is C power-like amplifier.
Preferably, the peak power amplifier is realized using transistor.
In order to overcome the drawbacks of the prior art, the present invention also proposes a kind of Doherty for improving back-off dynamic range
The implementation method of power amplifier, is achieved by the steps of:
The AB power-like amplifier for debugging a standard as Carrier Power Amplifier, and debugs carrier wave output matching electricity
Road makes load impedance 150 Europe of the carrier power amplifying circuit in low input power and the load impedance in high input power
For 50 Europe；
The C power-like amplifier for debugging a standard as peak power amplifier, and debugs peak value output matching circuit
Make load impedance 75 Europe of the peak power amplifying circuit in high input power；
Compensating line is set in peak value output matching circuit and integrated debugging peak value output matching circuit and compensating line make
Load impedance of the peak power amplifying circuit in low input power is infinity；
A novel load modulating network is debugged, the novel load modulating network uses the quarter-wave resistance in 86.6 Europe
Resistance parallel operation T1；
Using Wilkinson power divider by the carrier power amplifying circuit debugged, peak power amplifying circuit and novel negative
It carries modulating network to combine, constitutes the Doherty power amplifier for improving back-off dynamic range, wherein carrier power
The output end of amplifying circuit is connected with one end of the impedance transformer T1, the other end of the impedance transformer T1 with it is described
The output end of peak power amplifying circuit is connected, and is connected jointly with one end of the load, the other end of the load
Ground connection.
Preferably, the compensating line is 75 Europe.
Preferably, the quarter-wave delay line phase in 50 Europe is equipped in the front end of peak value input matching circuit.
Compared with the prior art, the present invention is increased by the load modulation network of the traditional Doherty power amplifier of improvement
The load impedance of main power amplifier under low input power state makes winner's power amplifier 150 Europe of load impedance under low input power state,
The chip area of whole Doherty is reduced while the high efficiency back-off range for improving Doherty power amplifier.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram for the Doherty power amplifier for improving back-off dynamic range in the present invention.
Fig. 2 is a kind of working principle diagram for the Doherty power amplifier for improving back-off dynamic range of the present invention.
Fig. 3 is to simulate emulation datagram of the invention using ADS software.
Specific embodiment
Following is a specific embodiment of the present invention in conjunction with the accompanying drawings, technical scheme of the present invention will be further described,
However, the present invention is not limited to these examples.
In view of the defects existing in the prior art, applicant carries out the structure of Doherty power amplifier in the prior art
In-depth study, it is found by the applicant that traditional Doherty power amplifier carrier power amplifier is 100 in the load impedance of rollback point
Europe, this causes traditional Doherty power amplifier output power when keeping high efficiency at most to retract 6dB, has been difficult to meet
The requirement of current wireless communication system.
In order to overcome the drawbacks of the prior art, the application uses a kind of novel load modulating network, increases low input power
The load impedance of main power amplifier under state improves the high efficiency back-off range of Doherty power amplifier.Referring to Fig. 1, it show this hair
A kind of structural block diagram of bright Doherty power amplifier for improving back-off dynamic range, including equal part Wilkinson function point
Device, carrier power amplifying circuit, peak power amplifying circuit and novel load modulating network, wherein equal part Wilkinson function point
Device is used to after input power is carried out equal part exported respectively to carrier power amplifying circuit and peak power amplifying circuit, carrier wave function
The output of rate amplifying circuit terminates 86.6 Europe quarter wavelength impedance transducer T1, and the output with peak power amplifying circuit
End, which is connected, exports power combiner to load.
Carrier power amplifying circuit includes that the carrier wave input matching circuit, Carrier Power Amplifier and the carrier wave that are sequentially connected in series are defeated
Match circuit out, debugging carrier wave output matching circuit make load impedance of the carrier power amplifying circuit in low input power
150 Europe and load impedance in high input power are 50 Europe；Peak power amplifying circuit includes being sequentially connected in series peak value input
With circuit, peak power amplifier and peak value output matching circuit, debugging peak value output matching circuit makes peak power amplification electricity
Load impedance when Lu Gao input power is 75 Europe, while integrated setting compensating line makes peak in peak value output matching circuit
Being worth load impedance of the power amplification circuit in low input power is infinity.
By adopting the above technical scheme, novel load modulating network is only by one section of 86.6 Europe quarter wavelength impedance transducer
TI is constituted, and is put so as to increase under low input power state the load impedance of main power amplifier and greatly reduce Doherty power
The size of big device；The compensating line of peak value power amplifier output end is added in peak value output matching circuit simultaneously, to overcome biography
The compensating line of system Doherty power amplifier auxiliary branch is the technological deficiency defined with single center frequency points, and it is defeated to greatly reduce peak value
The quality factor of match circuit out, to greatly widen the bandwidth of operation of Doerty.
In a preferred embodiment, compensating line is 75 Europe, and it is to make peak value output matching circuit that compensating line, which is added,
Load impedance in low input power is infinity, simultaneously because high input power is to be matched to 75 Europe, using the benefit in 75 Europe
Repaying line is exactly to further increase performance when high input power.
The design principle of above-mentioned technical proposal is described in detail further below.Referring to fig. 2, it show a kind of raising power of the present invention
The working principle diagram of the Doherty power amplifier of rollback dynamic range.Load ZLOn voltage can indicate are as follows:
VL=ZL(IC'+IP)
The output impedance of major-minor (two auxiliary branch are classified as a branch) two branches can indicate respectively are as follows:
The voltage-current relationship at carrier power amplifier output end quarter-wave impedance transformation line both ends are as follows:
VP·IC'=VC·IC
Then,
In addition, can be obtained by quarter-wave impedance transformation line principle:
According to VC=IC·ZC, have,
Wherein ZT=86.6 Ω, ZL=50 Ω.
When low input power state, only carrier power amplifier is opened, and all input signals are amplified through carrier power amplifier, peak work
Discharge contract fully (IP=0), then carrier power amplifier and peak work are lowerd the output impedance under power and can be expressed as
ZP,Low=∞
The impedance being then combined under low power state a little is 50 ohm.
When high input power state, major-minor power amplifier works together, and when input power reaches maximum, major-minor power amplifier is simultaneously
Saturation, entirety Doherty power amplifier output power is maximum at this time, and peak value power amplifier output end is matched to 75 ohm at this time, even
ZP,HighMain power amplifier output end is matched to 50 ohm in saturation state by=75 Ω, then by 86.6 Europe quarter-wave impedances
Transformation line convert quarter-wave transformation line obtains 150 ohm, 150 ohm of must be combined point impedance in parallel with 75 ohm are 50 Europe
It is 50 ohm that point impedance is combined under nurse, i.e. low-power and high power state.Again because Doherty is integrally combined output end load
Impedance is 50 ohm, it is therefore not necessary to which therefore, the present invention is mentioning in combining output end one section of quarter-wave transmission line of series connection
The chip area of whole Doherty is reduced while high Doherty back-off range.
In a preferred embodiment, the front end of the peak value input matching circuit is additionally provided with 50 Europe quarter-waves
Delay line phase.
In a preferred embodiment, the Carrier Power Amplifier is AB power-like amplifier.
In a preferred embodiment, the Carrier Power Amplifier is realized using transistor.
In a preferred embodiment, the peak power amplifier is C power-like amplifier.
In a preferred embodiment, the peak power amplifier is realized using transistor.
In order to overcome the drawbacks of the prior art, the present invention also proposes a kind of Doherty for improving back-off dynamic range
The implementation method of power amplifier, is achieved by the steps of:
Step 1: the AB power-like amplifier of one standard of debugging as Carrier Power Amplifier, and debugs carrier wave output
Match circuit makes load impedance 150 Europe of the carrier power amplifying circuit in low input power and bearing in high input power
Load impedance is 50 Europe；
Step 2: the C power-like amplifier of one standard of debugging as peak power amplifier, and debugs peak value output
Match circuit makes load impedance 75 Europe of the peak power amplifying circuit in high input power；
Step 3: compensating line and integrated debugging peak value output matching circuit and benefit are set in peak value output matching circuit
It is infinitely great to repay the load impedance that line makes peak power amplifying circuit in low input power；The prior art is usually to export matching
After circuit design is good, on the basis of not changing match circuit, this root compensating line is redesigned；The compensating line of the prior art designs
Mode causes compensating line to be to define with single center frequency points, increase compensating line will increase the quality of output matching circuit because
Number, to inhibit the overall bandwidth of Doherty.The present invention, will by output matching circuit and compensating line integrated setting and debugging
Compensating line, which is added in peak value output matching circuit, makees peak value output matching circuit, so that the Q value of peak value output matching circuit is reduced,
The bandwidth of operation of Doherty power amplifier is greatly widened；
Step 4: one novel load modulating network of debugging, the novel load modulating network use 86.6 Europe a quarters
The impedance transformer T1 of wavelength；
Step 5: using Wilkinson power divider by the carrier power amplifying circuit debugged, peak power amplifying circuit
And novel load modulating network combines, and constitutes the Doherty power amplifier for improving back-off dynamic range, wherein
The output end of carrier power amplifying circuit is connected with one end of the impedance transformer T1, and the impedance transformer T1's is another
End is connected with the output end of the peak power amplifying circuit, and is connected jointly with one end of the load, the load
The other end ground connection.
Referring to Fig. 3, it is shown the emulation datagram simulated in 2.4GHz based on method of the invention using ADS software, by
It is found that in the case where output power retracts and is up to 9dB, which still can keep and be saturated defeated analog result
Almost consistent high efficiency under power rating out is far longer than the 6dB back-off range of traditional Doherty power amplifier.
The above description of the embodiment is only used to help understand the method for the present invention and its core ideas.It should be pointed out that pair
For those skilled in the art, without departing from the principle of the present invention, the present invention can also be carried out
Some improvements and modifications, these improvements and modifications also fall within the scope of protection of the claims of the present invention.To these embodiments
A variety of modifications are it will be apparent that General Principle defined herein can be for those skilled in the art
It is realized in other embodiments in the case where not departing from the spirit or scope of the present invention.Therefore, the present invention is not intended to be limited to
These embodiments shown in the application, and be to fit to consistent with principle disclosed in the present application and features of novelty widest
Range.
Claims (10)
1. a kind of Doherty power amplifier for improving back-off dynamic range, which is characterized in that including equal part Wilkinson
Power splitter, carrier power amplifying circuit, peak power amplifying circuit and novel load modulating network, wherein the Wilkinson
Power splitter is exported respectively after being used to carry out input power equal part to the carrier power amplifying circuit and peak power amplification electricity
The output power of road, the carrier power amplifying circuit and peak power amplifying circuit is after the novel load modulating network
It exports to load；
The impedance of the load is 50 ohm；The novel load modulating network is become using the quarter-wave impedance in 86.6 Europe
Parallel operation T1；The output end of the carrier power amplifying circuit is connected with one end of the impedance transformer T1, and the impedance becomes
The other end of parallel operation T1 is connected with the output end of the peak power amplifying circuit, and is connected jointly with one end of the load
It connects, the other end ground connection of the load；
The carrier power amplifying circuit includes that the carrier wave input matching circuit, Carrier Power Amplifier and the carrier wave that are sequentially connected in series are defeated
Match circuit out, debugging the carrier wave output matching circuit makes load of the carrier power amplifying circuit in low input power
Impedance is 150 Europe and the load impedance in high input power is 50 Europe；The peak power amplifying circuit includes being sequentially connected in series
Peak value input matching circuit, peak power amplifier and peak value output matching circuit, debugging the peak value output matching circuit makes
Load impedance of the peak power amplifying circuit in high input power is 75 Europe, while in the peak value output matching circuit
Middle integrated setting compensating line keeps load impedance of the peak power amplifying circuit in low input power infinitely great.
2. the Doherty power amplifier according to claim 1 for improving back-off dynamic range, which is characterized in that
The compensating line is 75 Europe.
3. the Doherty power amplifier according to claim 1 for improving back-off dynamic range, which is characterized in that
The front end of the peak value input matching circuit is additionally provided with the quarter-wave delay line phase in 50 Europe.
4. the Doherty power amplifier according to claim 1 for improving back-off dynamic range, which is characterized in that
The Carrier Power Amplifier is AB power-like amplifier.
5. the Doherty power amplifier according to claim 4 for improving back-off dynamic range, which is characterized in that
The Carrier Power Amplifier is realized using transistor.
6. the Doherty power amplifier according to claim 1 for improving back-off dynamic range, which is characterized in that
The peak power amplifier is C power-like amplifier.
7. the Doherty power amplifier according to claim 6 for improving back-off dynamic range, which is characterized in that
The peak power amplifier is realized using transistor.
8. a kind of implementation method for the Doherty power amplifier for improving back-off dynamic range, which is characterized in that by such as
Lower step is realized:
The AB power-like amplifier for debugging a standard as Carrier Power Amplifier, and is debugged carrier wave output matching circuit and is made
Load impedance of the carrier power amplifying circuit in low input power is 150 Europe and the load impedance in high input power is 50
Europe；
The C power-like amplifier for debugging a standard as peak power amplifier, and debugs peak value output matching circuit and makes peak
Being worth load impedance of the power amplification circuit in high input power is 75 Europe；
Compensating line is set in peak value output matching circuit and integrated debugging peak value output matching circuit and compensating line make peak value
Load impedance of the power amplification circuit in low input power is infinity；
A novel load modulating network is debugged, the novel load modulating network is become using the quarter-wave impedance in 86.6 Europe
Parallel operation T1；
Using Wilkinson power divider by the carrier power amplifying circuit debugged, peak power amplifying circuit and novel load tune
Combination of network processed is got up, and the Doherty power amplifier for improving back-off dynamic range is constituted, wherein carrier power amplification
The output end of circuit is connected with one end of the impedance transformer T1, the other end and the peak value of the impedance transformer T1
The output end of power amplification circuit is connected, and is connected jointly with one end of load, the other end ground connection of the load.
9. the implementation method of the Doherty power amplifier according to claim 8 for improving back-off dynamic range,
It is characterized in that, the compensating line is 75 Europe.
10. the implementation method of the Doherty power amplifier according to claim 8 for improving back-off dynamic range,
It is characterized in that, being equipped with the quarter-wave delay line phase in 50 Europe in the front end of peak value input matching circuit.
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| CN107231131B (en) * | 2017-06-06 | 2020-05-19 | 江苏大学 | Doherty power amplifier capable of enlarging power back-off range |
| CN107508560B (en) * | 2017-08-11 | 2021-01-26 | 杭州电子科技大学 | Doherty power amplifier for enhancing bandwidth performance and implementation method thereof |
| BR112020012575A2 (en) | 2017-12-22 | 2020-11-24 | Huawei Technologies Co., Ltd. | signal processing circuit, radio frequency signal transmitter, and communications device |
| CN108336975B (en) * | 2018-01-05 | 2022-02-22 | 中兴通讯股份有限公司 | Out-of-phase power amplifier, method and device for realizing output matching of out-of-phase power amplifier and power amplifier branch |
| CN110635698B (en) * | 2019-05-28 | 2021-04-30 | 电子科技大学 | Radio frequency signal rectifier with high backspacing range |
| CN113595509A (en) * | 2020-04-30 | 2021-11-02 | 中兴通讯股份有限公司 | Multi-stage Doherty power amplifier device |
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| CN102332875A (en) * | 2011-08-11 | 2012-01-25 | 电子科技大学 | Doherty power amplifier with high efficient broadband |
| CN105897179A (en) * | 2016-05-10 | 2016-08-24 | 杭州电子科技大学 | Compact wideband Doherty power amplifier and implementation method thereof |
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| JP4950083B2 (en) * | 2008-01-15 | 2012-06-13 | ルネサスエレクトロニクス株式会社 | High efficiency power amplifier |
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| CN102332875A (en) * | 2011-08-11 | 2012-01-25 | 电子科技大学 | Doherty power amplifier with high efficient broadband |
| CN105897179A (en) * | 2016-05-10 | 2016-08-24 | 杭州电子科技大学 | Compact wideband Doherty power amplifier and implementation method thereof |
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| 基于WCDMA标准的数字直放站Doherty功率放大器设计;方志远;《中国优秀硕士学位论文全文数据库信息科技辑》;20091230;第I135-161页 |
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Application publication date: 20170201 Assignee: Simone Technology (Shanghai) Co., Ltd Assignor: HANGZHOU DIANZI University Contract record no.: X2020330000033 Denomination of invention: Doherty power amplifier capable of improving power back-off dynamic range and realization method thereof Granted publication date: 20190101 License type: Common License Record date: 20200511 |
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