CN106411275A - Three-path Doherty power amplifier for improving bandwidth based on novel load modulation network and implementation method thereof - Google Patents
Three-path Doherty power amplifier for improving bandwidth based on novel load modulation network and implementation method thereof Download PDFInfo
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- CN106411275A CN106411275A CN201610889028.4A CN201610889028A CN106411275A CN 106411275 A CN106411275 A CN 106411275A CN 201610889028 A CN201610889028 A CN 201610889028A CN 106411275 A CN106411275 A CN 106411275A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/211—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only using a combination of several amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
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- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/42—Modifications of amplifiers to extend the bandwidth
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/56—Modifications of input or output impedances, not otherwise provided for
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Abstract
The invention provides a three-path Doherty power amplifier for improving a bandwidth based on a novel load modulation network and an implementation method thereof. An output end of a carrier power amplifier circuit is connected with a first 70.7 Ohm quarter-wave impedance transformer T1 and is connected with the output ends of a first peak power amplifier circuit and a second peak power amplifier circuit, and combination is realized by a second 40.82 Ohm quarter-wave impedance transformer T2 to output the power to a load. Compared with the prior art, the load modulation network of the traditional Doherty power amplifier is improved, the impedance transformation ratio of the load modulation network is reduced, and meanwhile a compensation line of a peak branch is added in a peak output matching circuit, thereby reducing the quality factors of the entire peak output matching circuit, and greatly broadening the working bandwidth of the three-path Doherty power amplifier.
Description
Technical field
The present invention relates to radio-frequency communication technical field, more particularly, to a kind of bandwidth is improved based on novel load modulating network
Three tunnel Doherty power amplifier and its implementation.
Background technology
Nearly half a century, frequency microwave technology has obtained the development advanced by leaps and bounds, and is widely used in WLAN, hand mechanical, electrical
The wireless communication fields such as sub- antagonism, satellite communication.RF power amplification unit is the core component in wireless communication system, in order to realize
Signal long-distance transmissions, guarantee signal reliable reception, must be put using power amplifier in wireless communication system transmitting-receiving subassembly
Big signal.It may be said that the performance quality of power amplifier will directly influence the working condition of whole system, it is wireless receiving and dispatching system
The core component of radio-frequency front-end in system.
Developing rapidly with wireless communication technology, frequency microwave technology is more and more important in daily life.
In order to transmit data volume as big as possible in limited spectral bandwidth, communication business generally adopts extremely complex modulation system,
And this can lead to the peak-to-average force ratio (PAPR) of signal to become big, and use traditional power amplifier such as A class, AB class that non-perseverance envelope is believed
It is very low, especially when high-power rollback number to be amplified efficiency.Take into account high efficiency and the radio-frequency power of high linearity is put
Big device becomes one of study hotspot of academia and industrial quarters.Doherty power amplifier is because of energy high efficiency amplifier modulated signal
And cost is relatively low and the dominant form that becomes the adopted power amplifier of current radio communication.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 by power splitter
Enter, output end is passed through a load modulation network and exported signal combining, according to the major-minor work(of size dynamic modulation of input signal
The pay(useful) load impedance of rate amplifier, so that Doherty power amplifier still has in the case of power output significantly rollback
Very high efficiency.
But the fast development with the communication technology, modulation system is also all the more complicated, traditional two-way Doherty power amplification
The scope of device back-off 6dB can not meet the requirement of current wireless communication system, therefore, three road Doherty power amplifiers with
Generation.Three road Doherty technology can improve the efficiency of power amplifier in the case of more power rollback, increases high efficiency power
The scope of rollback.
However, three tunnel Doherty power amplifier of the prior art there is also the common fault band of traditional Doherty power amplifier
Wide narrower problem.In prior art, the load modulation network of three tunnel Doherty power amplifier still adopts prior art to lead to
50 ohm of quarter wavelength impedance transducer, this leads to its impedance transformation ratio larger, therefore, significantly limit band
Wide.
In the face of the worsening shortages of frequency spectrum resource, the wireless of multiple working frequency range compatible various protocols standard can be covered simultaneously
Wide-band communication system has become as the development priority of wireless technology.Therefore, urgent need is developed new broadband Doherty power and is put
Big device is to meet the requirement of current and future wireless communication system high-transmission digit rate.Broadband Doherty power amplifier is also natural
Become academia and the focus of industrial quarters research.
Therefore, for drawbacks described above present in currently available technology, it is necessary in fact to be studied, to provide a kind of scheme,
Solve defect present in prior art.
Content of the invention
In view of this, it is an object of the invention to provide a kind of three tunnels improving bandwidth based on novel load modulating network
Doherty power amplifier and its implementation, modulate net by improving the load of traditional three tunnel Doherty power amplifier
Network, reduces the size of load modulation network and reduces the impedance transformation ratio of load modulation network, simultaneously by the compensation of peak value branch road
Line is added in peak value output matching circuit, reduces the quality factor of overall peaks output matching circuit, greatly widens three tunnels
The bandwidth of operation of Doherty power amplifier.
In order to overcome the defect of prior art, the present invention employs the following technical solutions：
A kind of three tunnel Doherty power amplifier improving bandwidth based on novel load modulating network, including three road deciles
Power splitter, carrier power amplifying circuit, the first peak value power amplification circuit, the second peak power amplifying circuit and novel load are adjusted
Network processed, wherein, described three tunnels etc. point power splitter is used for carrying out exporting respectively after trisection to described carrier wave work(by input power
Rate amplifying circuit, the first peak value power amplification circuit and the second peak power amplifying circuit, described carrier power amplifying circuit,
The power output of one peak power amplifying circuit and the second peak power amplifying circuit is after described novel load modulating network
Export to load；
The impedance of described load is 50 ohm；Described novel load modulating network includes the first impedance transformer T1 and second
Impedance transformer T2, described first impedance transformer T1 adopt the quarter-wave impedance transformer in 70.7 Europe, described second
Impedance transformer T2 adopts the quarter-wave impedance transformer in 40.82 Europe；The output end of described carrier power amplifying circuit
It is connected with one end of described first impedance transformer T1, the other end of described first impedance transformer T1 and described first peak value
The output end of power amplification circuit and the second peak power amplifying circuit is connected, and common and described second impedance transformer T2
One end be connected, the other end of described second impedance transformer T2 is connected with one end of described load, described load another
One end is grounded；
Described carrier power amplifying circuit includes carrier wave input matching circuit, Carrier Power Amplifier and the load being sequentially connected in series
Ripple output matching circuit, debugs what described carrier wave output matching circuit made described carrier power amplifying circuit in low input power
Load impedance is 150 Europe and the load impedance in high input power is 50 Europe；Described first peak value power amplification circuit includes
It is sequentially connected in series the first peak value input matching circuit, the first peak value power amplifier and the first peak value output matching circuit, debug institute
Stating the first peak value output matching circuit and making the load impedance in high input power for the described first peak value power amplification circuit is 100
Europe, in described first peak value output matching circuit, integrated setting the first compensating line C1 makes described first peak power put simultaneously
The big load impedance in low input power for the circuit is infinity；Described second peak power amplifying circuit includes being sequentially connected in series
Two peak value input matching circuits, the second peak power amplifier and the second peak value output matching circuit, debug described second peak value
It is 100 Europe that output matching circuit makes the load impedance in high input power for the described second peak power amplifying circuit, exists simultaneously
In described second peak value output matching circuit, integrated setting the second compensating line C2 makes described second peak power amplifying circuit exist
Load impedance during low input power is infinity.
Preferably, described first compensating line C1 is 100 Europe.
Preferably, described second compensating line C2 is 100 Europe.
Preferably, the front end of described first peak value input matching circuit is additionally provided with the quarter-wave phase delay in 50 Europe
Line.
Preferably, the front end of described second peak value input matching circuit is additionally provided with the quarter-wave phase delay in 50 Europe
Line.
Preferably, described Carrier Power Amplifier is AB power-like amplifier, described first peak value power amplifier and institute
Stating the second peak power amplifier is C power-like amplifier.
Preferably, described Carrier Power Amplifier, described first peak value power amplifier and described second peak power are put
Big device is all realized using transistor.
In order to overcome the defect of prior art, the present invention also proposes a kind of to improve bandwidth based on novel load modulating network
The implementation method of three tunnel Doherty power amplifier is it is characterised in that be achieved by the steps of：
The AB power-like amplifier of one standard of debugging, as Carrier Power Amplifier, and debugs carrier wave output matching electricity
It is 150 Europe and the load impedance in high input power that road makes the load impedance in low input power for the carrier power amplifying circuit
For 50 Europe；
The C power-like amplifier of one standard of debugging, as the first peak value power amplifier, and debugs the first peak value output
It is 100 Europe that match circuit makes the load impedance in high input power for the first peak value power amplification circuit；
The C power-like amplifier of one standard of debugging, as the second peak power amplifier, and debugs the second peak value output
It is 100 Europe that match circuit makes the load impedance in high input power for the second peak power amplifying circuit；
First compensating line C1 integrated debugging the first peak value output matching are set in the first peak value output matching circuit
Circuit and the first compensating line C1 make the load impedance in low input power for the first peak value power amplification circuit for infinity；?
Second compensating line C2 is set in two peak value output matching circuits and integrated debugging the second peak value output matching circuit and the second benefit
Repaying line C2 and making the load impedance in low input power for the second peak power amplifying circuit is infinity；
Debug a novel load modulating network, described novel load modulating network includes the first impedance transformer T1 and second
Impedance transformer T2, described first impedance transformer T1 adopt the quarter-wave impedance transformer in 70.7 Europe, described second
Impedance transformer T2 adopts the quarter-wave impedance transformer in 40.82 Europe；
Using point power splitter such as three tunnels by the carrier power debugged amplifying circuit, the first peak value power amplification circuit, the
Two peak power amplifying circuits and novel load modulating network combine, and constitute and improve bandwidth based on novel load modulating network
Three tunnel Doherty power amplifier, wherein, the output end of carrier power amplifying circuit and described first impedance transformer T1's
One end is connected, the other end of described first impedance transformer T1 and described first peak value power amplification circuit and the second its peak work
The output end of rate amplifying circuit is connected, and is jointly connected with one end of described second impedance transformer T2, described second resistance
The other end of resistance parallel operation T2 is connected with one end of described load, the other end ground connection of described load.
Preferably, described first compensating line C1 and described second compensating line C2 is 100 Europe.
Preferably, it is equipped with 50 Ou Si in the front end of the first peak value input matching circuit and the second peak value input matching circuit
The delay line phase of/mono- wavelength.
Hinge structure, present invention improves over the load modulation network of traditional three tunnel Doherty power amplifier, tradition
The impedance transformation ratio of three tunnel Doherty power amplifier load modulation network is 9:1 (150 Europe are to 16.67 Europe), new in the present invention
The impedance transformation ratio of type load modulation network is 4.5:1 (150 Europe are to 33.33 Europe), the impedance reducing load modulation network becomes
Change ratio, according to the expression formula of above-mentioned quarter-wave transmission line bandwidth of operation, novel load modulating network will increase three tunnels
The bandwidth of Doherty power amplifier；Meanwhile, the compensating line of traditional three road Doherty power amplifier auxiliary branch is with single center frequency points
Definition, increase the quality factor of output matching circuit, thus suppressing the overall bandwidth of three road Doherty, the present invention will compensate
Line adds the Q value reducing peak value output matching circuit in peak value output matching circuit, increases the work of three road Doherty power amplifiers
Bandwidth.
Brief description
Fig. 1 is the knot of the three tunnel Doherty power amplifier improving bandwidth in the present invention based on novel load modulating network
Structure schematic diagram.
Fig. 2 is characteristic impedance is ZTQuarter-wave transmission line impedance transformation characteristic.
Fig. 3 is the work of the three tunnel Doherty power amplifier improving bandwidth in the present invention based on novel load modulating network
Make schematic diagram.
Fig. 4 a is the master of Wideband three road Doherty scheme Imitating in traditional three road Doherty schemes and the present invention
Amplifier saturation point (high-power) place load impedance reality imaginary part with frequency variation relation.
Fig. 4 b is the master of Wideband three road Doherty scheme Imitating in traditional three road Doherty schemes and the present invention
Amplifier rollback point (small-power) place load impedance reality imaginary part with frequency variation relation.
Specific embodiment
The following is the specific embodiment of the present invention and combine accompanying drawing, technical scheme is further described,
But the present invention is not limited to these embodiments.
The defect existing for prior art, the structure to three tunnel Doherty power amplifier in prior art for the applicant
Conduct in-depth research, it is found by the applicant that the load of three tunnel Doherty power amplifier carrier power amplifier is modulated in prior art
Quarter wavelength impedance transducer impedance transformation ratio in network is larger, makes traditional three tunnel Doherty power amplifier loads
The impedance transformation ratio of modulating network is 9:1 (150 Europe are to 16.67 Europe), thus greatly inhibit the work band of three road Doherty
Wide；And the compensating line of traditional three road Doherty power amplifier auxiliary branch is with the definition of single center frequency points, can increase output
The quality factor on distribution road, thus suppress the overall bandwidth of three road Doherty.
Applicant is found by theory analysis, and the approximate expression of quatrter-wavelength line bandwidth of operation is：
Wherein Δ f/f0Represent the relative bandwidth of quarter-wave impedance transformation line；ΓmFor maximum receptible reflection system
Number；Z0And ZLRepresent the resistance value of two ports；In order to increase Δ f/f0Value, can by reduce Z0And ZLRatio.
Referring to Fig. 2, showing characteristic impedance is ZTQuarter-wave transmission line impedance transformation characteristic.According to Fig. 2
It is Z that characteristic impedance can be obtainedTThe input impedance of quarter-wave transmission line be：
Impedance transformation ratio is defined as the impedanoe ratio of quarter-wave transmission line input and output two-port, i.e. impedance conversion
Than：
From the bandwidth of operation expression formula of quarter-wave transmission line, work as Z0And ZLResistance value closer to when, that is, four
The impedance transformation ratio of/mono- wavelength transmission line is less, and its bandwidth of operation is wider.Therefore, in order to increase Δ f/f0Value, can lead to
Cross reduction Z0And ZLRatio, that is, reduce quarter-wave transmission line impedance transformation ratio k.
In order to overcome the defect of prior art, the application adopts a kind of novel load modulating network, referring to Fig. 1, show
The present invention improves the structured flowchart of three tunnel Doherty power amplifier of bandwidth based on novel load modulating network, including three tunnels
Decile power splitter, carrier power amplifying circuit, the first peak value power amplification circuit, the second peak power amplifying circuit and novel negative
Carry modulating network, wherein, three tunnels etc. point power splitter is used for carrying out exporting respectively after decile by input power amplifying to carrier power
Circuit, the first peak value power amplification circuit and the second peak power amplifying circuit, novel load modulating network includes the first impedance
Converter T1 and the second impedance transformer T2；Wherein, the output of carrier power amplifying circuit terminates 70.7 Europe quarter-waves
First impedance transformer T1, and be connected with the output end of the first peak value power amplification circuit and the second peak power amplifying circuit
Connect, give load through 40.82 Europe quarter-wave the second impedance transformer T2 combinings by power output.
Carrier wave input matching circuit, Carrier Power Amplifier and carrier wave that carrier power amplifying circuit includes being sequentially connected in series are defeated
Go out match circuit, debugging carrier wave output matching circuit makes the load impedance in low input power for the carrier power amplifying circuit be
150 Europe and the load impedance in high input power are 50 Europe；First peak value power amplification circuit includes being sequentially connected in series first peak
Value input matching circuit, the first peak value power amplifier and the first peak value output matching circuit, debug the first peak value output matching
It is 100 Europe that circuit makes the load impedance in high input power for the first peak value power amplification circuit, exports in the first peak value simultaneously
In match circuit, integrated setting the first compensating line C1 makes the load resistance in low input power for the first peak value power amplification circuit
Resist for infinity；Second peak power amplifying circuit includes being sequentially connected in series the second peak value input matching circuit, the second peak power
Amplifier and the second peak value output matching circuit, debugging the second peak value output matching circuit makes the second peak power amplifying circuit exist
Load impedance during high input power is 100 Europe, and in the second peak value output matching circuit, integrated setting second compensates simultaneously
It is infinity that line C2 makes the load impedance in low input power for the second peak power amplifying circuit.
Due to adopting technique scheme, by a kind of novel load modulating network thus reducing load modulation network
Impedance transformation ratio；The compensating line of peak value power amplifier output end is added in peak value output matching circuit, thus overcoming biography simultaneously
Unite three road Doherty power amplifier auxiliary branch compensating line be with single center frequency points definition technological deficiency, greatly reduce peak
The quality factor of value output matching circuit, thus greatly widen the bandwidth of operation of three road Doerty.
In a preferred embodiment, the first compensating line C1 and the second compensating line C2 is 100 Europe, and addition compensating line is
In order that the first peak value output matching circuit and the second peak power amplifying circuit load impedance in low input power is no
Big thoroughly, simultaneously because high input power is to match 100 Europe, the compensating line using 100 Europe is exactly high defeated in order to improve further
Enter performance during power.
The design principle of technique scheme is described in detail in detail further below.Referring to Fig. 3, it show in the present invention and be based on novel negative
Carry the fundamental diagram that modulating network improves three tunnel Doherty power amplifier of bandwidth.Load ZLOn voltage can represent
For：
VL=ZL(IC'+IP)
IP=IP1+IP2
The output impedance of major-minor (two auxiliary branch is classified as a branch road) two branch roads can be expressed as respectively：
The voltage-current relationship at carrier power amplifier output end quarter-wave impedance transformation line two ends is：
VP·IC'=VC·IC
Wherein,
VP=VP1=VP2
Then,
Additionally, can be obtained by quarter-wave impedance transformation line principle：
According to VC=IC·ZC, have：
Wherein, ZT=70.7 Ω, ZL=33.33 Ω.
When low input power state, only carrier power amplifier is opened, and all input signals are amplified through carrier power amplifier, two-way peak
Value power amplifier completely closes (IP1=IP2=0) output impedance that, then carrier power amplifier and its peak work are lowerd under power can be expressed as：
ZP1,Low=ZP2,Low=∞
Then under low power state, the impedance of combining point is 33.33 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, now overall Doherty power amplifier power output is maximum, now two-way peak value power amplifier output end is all matched 100 ohm,
Even ZP1,High=ZP2,High=100 Ω, main power amplifier output end are matched 50 ohm in saturation state, then by 70.7 Ou Si
/ mono- wavelength impedance transformation line becomes to be got quarter-wave transformation line in return and obtains 100 ohm, three 100 ohm combining points in parallel
Impedance is 33.33 ohm, and that is, under low-power and high power state, combining point impedance is 33.33 ohm.Again because Doherty is whole
Body combining output end load impedance is 50 ohm, accordingly, it would be desirable to be 40.82 Europe in the one section of characteristic impedance of series connection of combining output end
Quarter-wave transmission line, combining point 33.33 ohmage is transformed to 50 ohm.
In a preferred embodiment, the front end of described first peak value input matching circuit is additionally provided with 50 Europe a quarters
The delay line phase of wavelength.
In a preferred embodiment, the front end of described second peak value input matching circuit is additionally provided with 50 Europe a quarters
The delay line phase of wavelength.
In a preferred embodiment, described Carrier Power Amplifier is AB power-like amplifier, described first peak value
Power amplifier and described second peak power amplifier are C power-like amplifier.
In a preferred embodiment, described Carrier Power Amplifier, described first peak value power amplifier and described
Second peak power amplifier is all realized using transistor.
In order to overcome the defect of prior art, the present invention also proposes a kind of to improve bandwidth based on novel load modulating network
Three tunnel Doherty power amplifier implementation methods, are achieved by the steps of：
Step one：The AB power-like amplifier of one standard of debugging, as Carrier Power Amplifier, and debugs carrier wave output
It is 150 Europe and bearing in high input power that match circuit makes the load impedance in low input power for the carrier power amplifying circuit
Load impedance is 50 Europe；
Step 2：The C power-like amplifier of one standard of debugging, as the first peak value power amplifier, and debugs first
It is 100 Europe that peak value output matching circuit makes the load impedance in high input power for the first peak value power amplification circuit；
Step 3：The C power-like amplifier of one standard of debugging, as the second peak power amplifier, and debugs second
It is 100 Europe that peak value output matching circuit makes the load impedance in high input power for the second peak power amplifying circuit；
Step 4：First compensating line C1 is set in the first peak value output matching circuit and integrated debugging first peak value is defeated
Go out match circuit and the first compensating line C1 to make the load impedance in low input power for the first peak value power amplification circuit be infinite
Greatly；Second peak value output matching circuit is arranged the second compensating line C2 integrated debugging the second peak value output matching circuit and
It is infinity that second compensating line C2 makes the load impedance in low input power for the second peak power amplifying circuit；Prior art is led to
It is often after output matching circuit designs, or else change match circuit, redesign this root compensating line；The compensating line of prior art
It is with the definition of single center frequency points that design leads to compensating line, increases the quality that compensating line can increase output matching circuit
Factor, thus suppress the overall bandwidth of three road Doherty.The present invention is by output matching circuit and compensating line integrated setting and tune
Examination, compensating line is added in peak value output matching circuit and makees peak value output matching circuit, thus reducing peak value output matching circuit
Q value, greatly widened the bandwidth of operation of three road Doherty power amplifiers；
Step 5：Debug a novel load modulating network, described novel load modulating network includes the first impedance transformer
T1 and the second impedance transformer T2, described first impedance transformer T1 adopt the quarter-wave impedance transformer in 70.7 Europe,
Described second impedance transformer T2 adopts the quarter-wave impedance transformer in 40.82 Europe；
Step 6：Using point power splitter such as three tunnels by the carrier power debugged amplifying circuit, the first peak value power amplification
Circuit, the second peak power amplifying circuit and novel load modulating network combine, and constitute and are based on novel load modulating network
Improve three tunnel Doherty power amplifier of bandwidth, wherein, the output end of carrier power amplifying circuit is become with described first impedance
One end of parallel operation T1 is connected, the other end of described first impedance transformer T1 and described first peak value power amplification circuit and the
The output end of two peak power amplifying circuits is connected, and is jointly connected with one end of described second impedance transformer T2, institute
The other end stating the second impedance transformer T2 is connected with one end of described load, the other end ground connection of described load.
Referring to Fig. 4 a and Fig. 4 b, it show Wideband three road Doherty in traditional three road Doherty schemes and the present invention
The main amplifier of scheme Imitating is in saturation point (high-power) and rollback point (small-power) place load impedance reality imaginary part with frequency
Variation relation, knowable to the diagram of Fig. 4 a and Fig. 4 b, the present invention has greatly widened the bandwidth of operation of three road Doherty power amplifiers.
The explanation of above example is only intended to help and understands the method for the present invention and its core concept.It should be pointed out that it is right
For those skilled in the art, under the premise without departing from the principles of the invention, the present invention can also be carried out
Some improvement and modification, these improve and modify and also fall in the protection domain of the claims in the present invention.To these embodiments
Multiple modifications are it will be apparent that General Principle defined herein can be for those skilled in the art
Realize in other embodiments without departing from the case of 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 it is to fit to consistent with principle disclosed in the present application and features of novelty the widest
Scope.
Claims (10)
1. a kind of based on novel load modulating network improve bandwidth three tunnel Doherty power amplifier it is characterised in that include
Point power splitter such as three tunnels, carrier power amplifying circuit, the first peak value power amplification circuit, the second peak power amplifying circuit and new
Type load modulation network, wherein, described three tunnels etc. point power splitter is used for carrying out exporting respectively to institute after trisection by input power
State carrier power amplifying circuit, the first peak value power amplification circuit and the second peak power amplifying circuit, described carrier power is put
The power output of big circuit, the first peak value power amplification circuit and the second peak power amplifying circuit is adjusted through described novel load
Export to load after network processed；
The impedance of described load is 50 ohm；Described novel load modulating network includes the first impedance transformer T1 and the second impedance
Converter T2, described first impedance transformer T1 adopt the quarter-wave impedance transformer in 70.7 Europe, described second impedance
Converter T2 adopts the quarter-wave impedance transformer in 40.82 Europe；The output end of described carrier power amplifying circuit and institute
The one end stating the first impedance transformer T1 is connected, the other end of described first impedance transformer T1 and described first peak power
The output end of amplifying circuit and the second peak power amplifying circuit is connected, and common with described second impedance transformer T2 one
End is connected, and the other end of described second impedance transformer T2 is connected with one end of described load, the other end of described load
Ground connection；
Carrier wave input matching circuit, Carrier Power Amplifier and carrier wave that described carrier power amplifying circuit includes being sequentially connected in series are defeated
Go out match circuit, debugging described carrier wave output matching circuit makes the load in low input power for the described carrier power amplifying circuit
Impedance is 150 Europe and the load impedance in high input power is 50 Europe；Described first peak value power amplification circuit is included successively
Concatenate the first peak value input matching circuit, the first peak value power amplifier and the first peak value output matching circuit, debugging described the
It is 100 Europe that one peak value output matching circuit makes the load impedance in high input power for the described first peak value power amplification circuit,
In described first peak value output matching circuit, integrated setting the first compensating line C1 makes described first peak value power amplification simultaneously
The load impedance in low input power for the circuit is infinity；Described second peak power amplifying circuit includes being sequentially connected in series second
Peak value input matching circuit, the second peak power amplifier and the second peak value output matching circuit, debug described second peak value defeated
Go out match circuit to make the load impedance in high input power for the described second peak power amplifying circuit is 100 Europe, simultaneously in institute
Stating integrated setting the second compensating line C2 in the second peak value output matching circuit makes described second peak power amplifying circuit low
Load impedance during input power is infinity.
2. the three tunnel Doherty power amplifier improving bandwidth based on novel load modulating network according to claim 1,
It is characterized in that, described first compensating line C1 is 100 Europe.
3. the three tunnel Doherty power amplifier improving bandwidth based on novel load modulating network according to claim 1,
It is characterized in that, described second compensating line C2 is 100 Europe.
4. the three tunnel Doherty power amplifier improving bandwidth based on novel load modulating network according to claim 1,
It is characterized in that, the front end of described first peak value input matching circuit is additionally provided with the quarter-wave delay line phase in 50 Europe.
5. the three tunnel Doherty power amplifier improving bandwidth based on novel load modulating network according to claim 1,
It is characterized in that, the front end of described second peak value input matching circuit is additionally provided with the quarter-wave delay line phase in 50 Europe.
6. the three tunnel Doherty power amplifier improving bandwidth based on novel load modulating network according to claim 1,
It is characterized in that, described Carrier Power Amplifier is AB power-like amplifier, described first peak value power amplifier and described the
Two peak power amplifiers are C power-like amplifier.
7. the three tunnel Doherty power amplifier improving bandwidth based on novel load modulating network according to claim 6,
It is characterized in that, described Carrier Power Amplifier, described first peak value power amplifier and described second peak power amplifier
All realized using transistor.
8. a kind of implementation method of the three tunnel Doherty power amplifier improving bandwidth based on novel load modulating network, it is special
Levy and be, be achieved by the steps of：
The AB power-like amplifier of one standard of debugging, as Carrier Power Amplifier, and debugs carrier wave output matching circuit and makes
The load impedance in low input power for the carrier power amplifying circuit is 150 Europe and the load impedance in high input power is 50
Europe；
The C power-like amplifier of one standard of debugging, as the first peak value power amplifier, and debugs the first peak value output matching
It is 100 Europe that circuit makes the load impedance in high input power for the first peak value power amplification circuit；
The C power-like amplifier of one standard of debugging, as the second peak power amplifier, and debugs the second peak value output matching
It is 100 Europe that circuit makes the load impedance in high input power for the second peak power amplifying circuit；
First compensating line C1 integrated debugging the first peak value output matching circuit are set in the first peak value output matching circuit
Making the load impedance in low input power for the first peak value power amplification circuit with the first compensating line C1 is infinity；At the second peak
Second compensating line C2 integrated debugging the second peak value output matching circuit and the second compensating line are set in value output matching circuit
It is infinity that C2 makes the load impedance in low input power for the second peak power amplifying circuit；
Debug a novel load modulating network, described novel load modulating network includes the first impedance transformer T1 and the second impedance
Converter T2, described first impedance transformer T1 adopt the quarter-wave impedance transformer in 70.7 Europe, described second impedance
Converter T2 adopts the quarter-wave impedance transformer in 40.82 Europe；
Using point power splitter such as three tunnels by the carrier power debugged amplifying circuit, the first peak value power amplification circuit, the second peak
Value power amplification circuit and novel load modulating network combine, and constitute and improve the three of bandwidth based on novel load modulating network
Road Doherty power amplifier, wherein, one end of the output end of carrier power amplifying circuit and described first impedance transformer T1
It is connected, the other end of described first impedance transformer T1 is put with described first peak value power amplification circuit and the second peak power
The output end of big circuit is connected, and is jointly connected with one end of described second impedance transformer T2, and described second impedance becomes
The other end of parallel operation T2 is connected with one end of described load, the other end ground connection of described load.
9. the three tunnel Doherty power amplifier improving bandwidth based on novel load modulating network according to claim 8
Implementation method it is characterised in that described first compensating line C1 and described second compensating line C2 be 100 Europe.
10. the three tunnel Doherty power amplifier improving bandwidth based on novel load modulating network according to claim 8
Implementation method it is characterised in that being all provided with the front end of the first peak value input matching circuit and the second peak value input matching circuit
There is the quarter-wave delay line phase in 50 Europe.
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| CN107332519A (en) * | 2017-07-07 | 2017-11-07 | 杭州电子科技大学 | A kind of broadband Doherty power amplifier and its implementation that combiner is exported based on modified |
| CN109660212A (en) * | 2018-11-27 | 2019-04-19 | 江苏大学 | A kind of 3 tunnel Doherty power amplifiers for expanding bandwidth using reactance compensation |
| CN111384901A (en) * | 2020-03-14 | 2020-07-07 | 电子科技大学 | Broadband high-efficiency three-way Doherty power amplifier based on post-matching network |
| CN111585517A (en) * | 2020-04-16 | 2020-08-25 | 江苏大学 | Broadband dual-band 3-path Doherty power amplifier adopting combined output network |
| CN112543002A (en) * | 2020-12-23 | 2021-03-23 | 杭州电子科技大学 | Broadband differential Doherty power amplifier and design method and application thereof |
| WO2021259265A1 (en) * | 2020-06-23 | 2021-12-30 | 中兴通讯股份有限公司 | Doherty power amplifier and power amplification method |
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| CN112543002A (en) * | 2020-12-23 | 2021-03-23 | 杭州电子科技大学 | Broadband differential Doherty power amplifier and design method and application thereof |
| CN112543002B (en) * | 2020-12-23 | 2023-10-27 | 杭州电子科技大学 | Broadband differential Doherty power amplifier and design method and application thereof |
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Application publication date: 20170215 Assignee: Simone Technology (Shanghai) Co., Ltd Assignor: HANGZHOU DIANZI University Contract record no.: X2020330000033 Denomination of invention: Three-path Doherty power amplifier for improving bandwidth and implementation method Granted publication date: 20181116 License type: Common License Record date: 20200511 |
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