CN106411265B - A kind of asymmetric Doherty power amplifier and its implementation for expanding bandwidth - Google Patents
A kind of asymmetric Doherty power amplifier and its implementation for expanding bandwidth Download PDFInfo
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- CN106411265B CN106411265B CN201610888690.8A CN201610888690A CN106411265B CN 106411265 B CN106411265 B CN 106411265B CN 201610888690 A CN201610888690 A CN 201610888690A CN 106411265 B CN106411265 B CN 106411265B
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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
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
- H03F1/0288—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers using a main and one or several auxiliary peaking amplifiers whereby the load is connected to the main amplifier using an impedance inverter, e.g. Doherty amplifiers
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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
- H03F1/42—Modifications of amplifiers to extend the bandwidth
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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
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/36—Indexing scheme relating to amplifiers the amplifier comprising means for increasing the bandwidth
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Abstract
The present invention provides a kind of asymmetric Doherty power amplifier and its implementation for expanding bandwidth, it is used to input power carrying out not equal part using asymmetric power splitter, and lower-powered first signal is exported to the main power amplification circuit and exports the biggish second signal of power to the auxiliary power amplifying circuit；The output end of main power amplification circuit is connected with one end of impedance transformer T1, the output end of auxiliary power amplifying circuit is connected with one end of the second impedance transformer T2, the other end of second impedance transformer T2 is connected with one end of third impedance transformer T3, the other end of impedance transformer T1 is connected with the other end of third impedance transformer T3, and is connected jointly with one end of load.Using technical solution of the present invention, so that Doherty power amplifier is can still be maintained in back-off 9dB efficient while increasing the bandwidth of operation of asymmetric Doherty power amplifier.
Description
Technical field
The present invention relates to radio-frequency communication technical fields more particularly to a kind of asymmetric Doherty power for expanding bandwidth to put
Big device 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 as to so that Doherty power amplifier in the case where output power significantly retracts still
With very high efficiency.
However, traditional Doherty power amplifier output power efficiency in saturation power rollback 6dB reaches highest,
When back-off is greater than 6dB, efficiency will be reduced quickly.Along with future input signal be multicarrier and number is more and more
The case where, peak-to-average force ratio also increasingly improves, and can reach 9-12dB.Such as the peak-to-average force ratio in TD-SCDMA system can reach
10dB, if in this way, the efficiency of the Doherty power amplifier of traditional rollback 6dB will substantially reduce therefore for advocating energy conservation and environmental protection,
The world today of green communications, the rollback efficiency for improving power amplifier will have very great practical significance.
In addition, the Doherty power amplifier of unsymmetric structure can also have common fault-bandwidth of tradition Doherty power amplifier
Relatively narrow problem.Since the load modulation network of the Doherty power amplifier of unsymmetric structure is still logical using the prior art
50 ohm of quarter wavelength impedance transducer, this causes its impedance transformation ratio larger, therefore, significantly limits band
It is wide.
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 it is a kind of expand bandwidth asymmetric Doherty power amplifier and
Its implementation is passed through simultaneously using unsymmetric structure in major loop and subsidiary loop and improves tradition Doherty power amplification
The load modulation network of device increases the load impedance of main power amplifier under low input power state and improves its impedance transformation ratio, thus
The high efficiency back-off range for improving Doherty power amplifier, the mesh for being finally reached rollback 9dB and having expanded bandwidth while realizing
, this brings very big significance to the working efficiency for improving Doherty power amplifier.
In order to overcome the drawbacks of the prior art, the invention adopts the following technical scheme:
A kind of asymmetric Doherty power amplifier for expanding bandwidth, which is characterized in that including asymmetric power splitter, master
Power amplification circuit, auxiliary power amplifying circuit and load modulation network, wherein the asymmetric power splitter is used for input work
Rate carries out not equal part, and lower-powered first signal is exported to the main power amplification circuit and by power biggish the
Binary signal is exported to the auxiliary power amplifying circuit, the first via signal and second road signal of the asymmetric power splitter output
Power ratio be 1:2, the output power of the main power amplification circuit and auxiliary power amplifying circuit is by load modulation
Output is to load after network；
The impedance of the load is 50 ohm；The load modulation network includes the first impedance transformer T1, the second impedance
Converter T2 and third impedance transformer T3, the first impedance transformer T1 are become using the quarter-wave impedance in 86.6 Europe
Parallel operation, the second impedance transformer T2 use the quarter-wave impedance transformer in 43.3 Europe, the third impedance transformation
Device T3 uses the quarter-wave impedance transformer in 75 Europe；The output end of the main power amplification circuit and the impedance convert
One end of device T1 is connected, and the output end of the auxiliary power amplifying circuit is connected with one end of the second impedance transformer T2
It connects, the other end of the second impedance transformer T2 is connected with one end of the third impedance transformer T3, and the impedance becomes
The other end of parallel operation T1 is connected with the other end of the third impedance transformer T3, and is connected jointly with one end of the load
It connects, the other end ground connection of the load；
The main power amplification circuit includes the primary input match circuit being sequentially connected in series, main power amplifier and main output
With circuit, debugging the main output matching circuit makes load impedance of the main power amplification circuit in low input power
150 Europe and load impedance in high input power are 50 Europe；The auxiliary power amplifying circuit is defeated including being sequentially connected in series auxiliary
Enter match circuit, auxiliary power amplifier and auxiliary output matching circuit, the debugging auxiliary output matching circuit makes described auxiliary
Helping load impedance of the power amplification circuit in high input power is 25 Europe, while in the auxiliary output matching circuit integrally
It is infinitely great to change the load impedance that setting compensating line makes the auxiliary power amplifying circuit in low input power；
The main power amplifier is AB power-like amplifier, and the auxiliary power amplifier is C power-like amplifier.
Preferably, the compensating line is 25 Europe.
Preferably, the front end of the primary input match circuit is additionally provided with the quarter-wave delay line phase in 50 Europe.
Preferably, the main power amplifier is realized using transistor.
Preferably, the auxiliary power amplifier is realized using transistor.
In order to overcome the drawbacks of the prior art, the present invention also proposes that a kind of asymmetric Doherty power for expanding bandwidth is put
The implementation method of big device, is achieved by the steps of:
The AB power-like amplifier for debugging a standard as main power amplifier, and is debugged main output matching circuit and is made
Load impedance of the main power amplification 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 auxiliary power amplifier, and debugs auxiliary output matching circuit
Make load impedance 25 Europe of the auxiliary power amplifying circuit in high input power；Compensation is set in auxiliary output matching circuit
Simultaneously integrated debugging auxiliary output matching circuit and compensating line make load of the auxiliary power amplifying circuit in low input power to line
Impedance is infinity；
A load modulation network is debugged, the load modulation network includes the first impedance transformer T1, the second impedance transformation
Device T2 and third impedance transformer T3, the first impedance transformer T1 are using the quarter-wave impedance transformation in 86.6 Europe
Device, the second impedance transformer T2 use the quarter-wave impedance transformer in 43.3 Europe, the third impedance transformer
T3 uses the quarter-wave impedance transformer in 75 Europe；
The main power amplification circuit debugged, auxiliary power amplifying circuit and load are modulated by net using asymmetric power splitter
Network combines, wherein the asymmetric power splitter is used to input power carrying out not equal part, and lower-powered first is believed
Number output is exported to the auxiliary power amplifying circuit to the main power amplification circuit and by the biggish second signal of power,
The first via signal of the asymmetric power splitter output and the power ratio of second road signal are 1:2；The main power amplification circuit
Output end be connected with one end of the impedance transformer T1, the output end of the auxiliary power amplifying circuit and described second
One end of impedance transformer T2 is connected, and the other end of the second impedance transformer T2 is with the third impedance transformer T3's
One end is connected, and the other end of the impedance transformer T1 is connected with the other end of the third impedance transformer T3, and altogether
It is connected with one end of the load, the other end ground connection of the load.
Preferably, the compensating line is 25 Europe.
Preferably, the quarter-wave delay line phase in 50 Europe is equipped in the front end of primary input match circuit.
Compared with the prior art, the present invention in major loop and subsidiary loop by using unsymmetric structure to improve biography simultaneously
The load modulation network for Doherty power amplifier of uniting, increases the load impedance of main power amplifier under low input power state, so that
Main power amplifier load impedance under low input power state is 150 Europe, while reducing the impedance transformation ratio of load modulation network, this
The impedance transformation ratio of modified type load modulation network is 3:1 (150 Europe to 50 Europe) in invention, makes Doherty power amplifier in power
It can still be maintained efficient when rollback 9dB while increasing the bandwidth of operation of asymmetric Doherty power amplifier.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram for the asymmetric Doherty power amplifier for expanding bandwidth in the present invention.
Fig. 2 is the impedance transformation characteristic figure for the quarter-wave transmission line that characteristic impedance is ZT.
Fig. 3 is the high rollback Doherty power amplifier drain efficiency analogous diagram based on unsymmetric structure simulated.
The high rollback Doherty power amplifier bandwidth product analogous diagram based on unsymmetric structure that Fig. 4 is simulated.
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 is 100 Europe in the load impedance of rollback point, due to etc.
Divide the limitation of Wilkinson power divider so that its delivery efficiency at most can only reach highest in output power rollback 6dB, when defeated
Efficiency will be reduced quickly when back-off is more out, be difficult to meet the requirement of current wireless communication system.To find out its cause,
In the case where identical input power, the ratio of gains AB class main road amplifier of C class booster amplifier is low, so that booster amplifier is defeated
Electric current is lower than main road amplifier out, results in Doherty active load modulation and is not enough, reduces entire Doherty power
The rollback efficiency of amplifier；Meanwhile the impedance transformation ratio of traditional Doherty power amplifier load modulation network is 9:1 (150
Europe to 16.67 Europe), to greatly inhibit the bandwidth of operation of Doherty.
In order to overcome the drawbacks of the prior art, the application has used a kind of unsymmetric structure, makes C class booster amplifier and AB
The output electric current of class main road amplifier is suitable, so that active load be made sufficiently to modulate, while using load modulation network, increases low
The load impedance of main power amplifier and improve the impedance transformation ratio of load modulation network under input power state, to improve Doherty
The high efficiency back-off range of power amplifier and bandwidth is further expanded.Referring to Fig. 1, it show a kind of expansion bandwidth of the present invention
Asymmetric Doherty power amplifier structural block diagram, including asymmetric power splitter, main power amplification circuit, auxiliary power
Amplifying circuit and load modulation network, wherein asymmetric power splitter is used to input power carrying out not equal part, and power is smaller
The first signal export to main power amplification circuit and the biggish second signal of power is exported give auxiliary power amplifying circuit,
The first via signal of asymmetric power splitter output and the power ratio of second road signal are 1:2, main power amplification circuit and auxiliary function
The output power of rate amplifying circuit is exported after load modulation network to load.
Further, the impedance of load is 50 ohm；Load modulation network includes the first impedance transformer T1, the second impedance
Converter T2 and third impedance transformer T3, the first impedance transformer T1 are using the quarter-wave impedance transformation in 86.6 Europe
Device, the second impedance transformer T2 use the quarter-wave impedance transformer in 43.3 Europe, and third impedance transformer T3 uses 75
The quarter-wave impedance transformer in Europe；The output end of main power amplification circuit is connected with one end of impedance transformer T1,
The output end of auxiliary power amplifying circuit is connected with one end of the second impedance transformer T2, and the second impedance transformer T2's is another
End is connected with one end of third impedance transformer T3, and the other end of impedance transformer T1 is another with third impedance transformer T3's
End is connected, and is connected jointly with one end of load, the other end ground connection of load.Main power amplification circuit includes being sequentially connected in series
Primary input match circuit, main power amplifier and main output matching circuit, debugging main output matching circuit makes main power amplification
Load impedance of the circuit in low input power is 150 Europe and the load impedance in high input power is 50 Europe；Auxiliary power
Amplifying circuit includes being sequentially connected in series auxiliary input matching circuit, auxiliary power amplifier and auxiliary output matching circuit, is debugged auxiliary
25 Europe of load impedance for helping output matching circuit to make auxiliary power amplifying circuit in high input power, while being exported in auxiliary
Integrated setting compensating line keeps load impedance of the auxiliary power amplifying circuit in low input power infinitely great in match circuit；
Main power amplifier is AB power-like amplifier, and auxiliary power amplifier is C power-like amplifier.
Relative to the Doherty power amplifier technology of traditional rollback 6dB, by the present invention in that with unsymmetric structure and bearing
It carries modulating network and increases the rollback power of Doherty power amplifier, furthermore by improving asymmetric Doherty power amplification
The load modulation network of device, make theoretically asymmetric Doherty power amplifier load modulation network be 9:1 impedance transformation ratio
(150 Europe to 16.67 Europe) are reduced to 3:1 (150 Europe to 50 Europe), are still able to maintain high efficiency when being finally reached rollback 9dB
And the purpose of bandwidth is expanded.The compensating line of peak value power amplifier output end is added in auxiliary output matching circuit simultaneously, thus
The compensating line for overcoming traditional Doherty power amplifier auxiliary branch is the technological deficiency defined with single center frequency points, is subtracted significantly
The quality factor of small auxiliary output matching circuit, further widen the bandwidth of operation of Doerty.
In a preferred embodiment, compensating line is 25 Europe, and it is to make to assist 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 25 Europe, using the benefit in 25 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.Compared with the prior art, by the present invention in that with one kind
Unsymmetric structure, the first power splitter by determining input power than one not equal part of design, only in low input power
There is main power amplifier to work, the impedance of output end is Z0/ α, wherein α is the numerical value to retract.Traditional major-minor power amplifier of Doherty structure
Power ratio be 1:1, i.e. α=1/2 that is to say that the output impedance of the main power amplifier in rollback 6dB is 100 Europe；When major-minor power amplifier
Power ratio be 1:2 when, α=1/3 retracts also just reached 9dB at this time, and the output impedance of main power amplifier is just 150 Europe.In this base
On plinth, it is found by the applicant that in the load modulation network of asymmetric Doherty power amplifier carrier power amplifier in the prior art
Quarter wavelength impedance transducer impedance transformation ratio is larger, theoretically asymmetric Doherty power amplifier load modulation net
It is 9:1 (150 Europe to 16.67 Europe) that network, which obtains impedance transformation ratio, to greatly inhibit the bandwidth of operation of Doherty.
Applicant also found by theory analysis, the approximate expression of quatrter-wavelength line bandwidth of operation are as follows:
Wherein Δ f/f0Indicate the relative bandwidth of quarter-wave impedance transformation line；ΓmIt is for maximum receptible reflection
Number；Z0And ZLIndicate the impedance value of two ports；In order to increase Δ f/f0Value, can pass through 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, which can be obtained,TQuarter-wave transmission line input impedance are as follows:
Impedance transformation ratio is defined as the impedanoe ratio of quarter-wave transmission line input and output two-port, i.e. impedance converts
Than:
By the bandwidth of operation expression formula of quarter-wave transmission line it is found that when the impedance value of Z0 and ZL closer to when, i.e.,
The impedance transformation ratio of quarter-wave transmission line is smaller, and bandwidth of operation is wider.Therefore, in order to increase Δ f/f0Value, can
By reducing Z0And ZLRatio, that is, reduce quarter-wave transmission line impedance transformation ratio k.
When using circuit topological structure described in Fig. 1, when low input power state, only main power amplifier is opened, all defeated
Enter signal to amplify through main power amplifier, auxiliary power amplifier completely closes, then the output terminal impedance under main power amplifier and auxiliary power amplifier low-power are as follows:
ZC,Low=150 Ω
ZP,Low=∞
Then main power amplifier output impedance impedance value after one section of 86.6 Europe a quarter impedance transformation line T1 is 50 Europe (ginseng figure
2, Z herein0=150 Ω, ZT=86.6 Ω, then ZL=50 Ω), the impedance being combined under low power state at this time 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 main power amplifier output end is matched to 50 ohm in saturation state,
Then by obtaining 150 ohm after 86.6 Europe quarter-wave impedance transformation line T1 transformation；Similarly auxiliary power amplifier output end is in saturation shape
It is matched to 25 ohm when state, (joins Fig. 2, herein Z by obtaining 75 ohm after 43.3 Europe quarter-wave impedance transformation line T2 transformation0
=25 Ω, ZT=43.3 Ω, then ZL=75 Ω), quarter-wave impedance transformation line T3 hinders auxiliary power amplifier under high input power
It is anti-to have no effect, it only plays and the low input impedance of auxiliary power amplifier list branch circuit is remapped to infinite
Big effect, final combining point is by 150 ohm of main power amplifier list branch circuit and auxiliary power amplifier list branch electricity
75 ohm of parallel connections on road obtain 50 ohm, this is consistent with actual load impedance value.
In a preferred embodiment, the main power amplifier is realized using transistor.
In a preferred embodiment, the auxiliary power amplifier is realized using transistor.
In order to overcome the drawbacks of the prior art, the present invention also proposes that a kind of asymmetric Doherty power for expanding bandwidth is put
The implementation method of big device, is achieved by the steps of:
Step 1: the AB power-like amplifier of one standard of debugging as main power amplifier, and debugs main output matching
Circuit makes load impedance 150 Europe of the main power amplification circuit in low input power and the load impedance in high input power
For 50 Europe；
Step 2: the C power-like amplifier of one standard of debugging as auxiliary power amplifier, and debugs auxiliary output
Match circuit makes load impedance 25 Europe of the auxiliary power amplifying circuit in high input power；In auxiliary output matching circuit
Simultaneously integrated debugging auxiliary output matching circuit and compensating line make auxiliary power amplifying circuit in low input power to setting compensating line
When load impedance be infinity；The prior art is usually not change match circuit after output matching circuit designs
On the basis of, redesign this root compensating line；The compensating line design method of the prior art causes compensating line to be with single center frequency points
Definition, increasing compensating line will increase the quality factor of output matching circuit, to inhibit the overall bandwidth of Doherty.This hair
It is bright by output matching circuit and compensating line integrated setting and debugging, compensating line is added in auxiliary output matching circuit and is assisted
Output matching circuit has greatly widened the bandwidth of operation of Doherty power amplifier to reduce the Q value of auxiliary output matching circuit；
Step 3: one load modulation network of debugging, load modulation network include the first impedance transformer T1, the second impedance change
Parallel operation T2 and third impedance transformer T3, the first impedance transformer T1 use the quarter-wave impedance transformer in 86.6 Europe,
Second impedance transformer T2 uses the quarter-wave impedance transformer in 43.3 Europe, and third impedance transformer T3 uses 75 Ou Si
The impedance transformer of/mono- wavelength；
Step 4: it by the main power amplification circuit debugged, auxiliary power amplifying circuit and is born using asymmetric power splitter
It carries modulating network to combine, wherein asymmetric power splitter is used to carry out input power not equal part, and by lower-powered the
One signal exports to main power amplification circuit and exports the biggish second signal of power and give auxiliary power amplifying circuit, non-right
The first via signal of power splitter output and the power ratio of second road signal are referred to as 1:2；The output end of main power amplification circuit and resistance
One end of resistance parallel operation T1 is connected, and the output end of auxiliary power amplifying circuit is connected with one end of the second impedance transformer T2
It connects, the other end of the second impedance transformer T2 is connected with one end of third impedance transformer T3, and impedance transformer T1's is another
End is connected with the other end of third impedance transformer T3, and is connected jointly with one end of load, the other end ground connection of load.
Referring to Fig. 3, it show the expansion in centre frequency for 2.1GHz simulated using the dedicated ADS software of RF application
The asymmetric Doherty power amplifier drain efficiency analogous diagram of bandwidth.Simulation result as shown in Figure 3 is it is found that saturation output
Power is 45dBm, in the case where its rollback 9dB (i.e. output power be 36dBm) the Doherty power amplifier still can keep with
Almost consistent high efficiency under saturation output power state is far longer than the 6dB back-off range of traditional Doherty power amplifier.
Referring to fig. 4, shown simulated in the case where having determined output power rollback 9dB based on unsymmetric structure
High rollback Doherty power amplifier bandwidth product analogous diagram.It can clearly obtain finding out in 1.6GHz- from the figure
Drain efficiency is all on 36% in 2.6GHz frequency band, and output power is between 41dBm-45dBm.To prove the design scheme
Validity, i.e., not only met the high rollback of the Doherty power amplifier of unsymmetric structure but also met wide bandwidth.
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 (8)
1. a kind of asymmetric Doherty power amplifier for expanding bandwidth, which is characterized in that including asymmetric power splitter, main function
Rate amplifying circuit, auxiliary power amplifying circuit and load modulation network, wherein the asymmetric power splitter is used for input power
It carries out not equal part, and lower-powered first signal is exported to the main power amplification circuit and by power biggish second
Signal is exported to the auxiliary power amplifying circuit, the first via signal of the asymmetric power splitter output and second road signal
Power ratio is 1:2, and the output power of the main power amplification circuit and auxiliary power amplifying circuit modulates net by the load
Output is to load after network；
The impedance of the load is 50 ohm；The load modulation network includes the first impedance transformer T1, the second impedance transformation
Device T2 and third impedance transformer T3, the first impedance transformer T1 are using the quarter-wave impedance transformation in 86.6 Europe
Device, the second impedance transformer T2 use the quarter-wave impedance transformer in 43.3 Europe, the third impedance transformer
T3 uses the quarter-wave impedance transformer in 75 Europe；The output end and the impedance transformer of the main power amplification circuit
One end of T1 is connected, and the output end of the auxiliary power amplifying circuit is connected with one end of the second impedance transformer T2
It connects, the other end of the second impedance transformer T2 is connected with one end of the third impedance transformer T3, and the impedance becomes
The other end of parallel operation T1 is connected with the other end of the third impedance transformer T3, and is connected jointly with one end of the load
It connects, the other end ground connection of the load；
The main power amplification circuit includes the primary input match circuit being sequentially connected in series, main power amplifier and main output matching electricity
Road, debugging the main output matching circuit makes load impedance 150 Europe of the main power amplification circuit in low input power
And the load impedance in high input power is 50 Europe；The auxiliary power amplifying circuit includes being sequentially connected in series auxiliary input matching
Circuit, auxiliary power amplifier and auxiliary output matching circuit, debugging the auxiliary output matching circuit makes the auxiliary power
Load impedance of the amplifying circuit in high input power is 25 Europe, while the integrated setting in the auxiliary output matching circuit
Compensating line keeps load impedance of the auxiliary power amplifying circuit in low input power infinitely great；
The main power amplifier is AB power-like amplifier, and the auxiliary power amplifier is C power-like amplifier.
2. the asymmetric Doherty power amplifier according to claim 1 for expanding bandwidth, which is characterized in that the benefit
Repaying line is 25 Europe.
3. the asymmetric Doherty power amplifier according to claim 1 for expanding bandwidth, which is characterized in that the master
The front end of input matching circuit is additionally provided with the quarter-wave delay line phase in 50 Europe.
4. the asymmetric Doherty power amplifier according to claim 1 for expanding bandwidth, which is characterized in that the master
Power amplifier is realized using transistor.
5. the asymmetric Doherty power amplifier according to claim 1 for expanding bandwidth, which is characterized in that described auxiliary
Assist rate amplifier is realized using transistor.
6. a kind of implementation method for the asymmetric Doherty power amplifier for expanding bandwidth, which is characterized in that as follows
It realizes:
The AB power-like amplifier for debugging a standard as main power amplifier, and debugs main output matching circuit and makes main function
Load impedance of the rate 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 auxiliary power amplifier, and debug auxiliary output matching circuit make it is auxiliary
Helping load impedance of the power amplification circuit in high input power is 25 Europe；Compensating line is set simultaneously in auxiliary output matching circuit
Integrated debugging auxiliary output matching circuit and compensating line make load impedance of the auxiliary power amplifying circuit in low input power
For infinity；
A load modulation network is debugged, the load modulation network includes the first impedance transformer T1, the second impedance transformer T2
The quarter-wave impedance transformer in 86.6 Europe, institute are used with third impedance transformer T3, the first impedance transformer T1
The second impedance transformer T2 is stated using the quarter-wave impedance transformer in 43.3 Europe, the third impedance transformer T3 is used
The quarter-wave impedance transformer in 75 Europe；
Using asymmetric power splitter by the main power amplification circuit debugged, auxiliary power amplifying circuit and load modulation network group
Altogether, wherein the asymmetric power splitter is used to input power carrying out not equal part, and lower-powered first signal is defeated
It exports out to the main power amplification circuit and by the biggish second signal of power to the auxiliary power amplifying circuit, it is described
The first via signal of asymmetric power splitter output and the power ratio of second road signal are 1:2；The main power amplification circuit it is defeated
Outlet is connected with one end of the impedance transformer T1, the output end of the auxiliary power amplifying circuit and second impedance
One end of converter T2 is connected, one end of the other end of the second impedance transformer T2 and the third impedance transformer T3
Be connected, the other end of the impedance transformer T1 is connected with the other end of the third impedance transformer T3, and jointly with
One end of the load is connected, the other end ground connection of the load.
7. the implementation method of the asymmetric Doherty power amplifier according to claim 6 for expanding bandwidth, feature exist
In the compensating line is 25 Europe.
8. the implementation method of the asymmetric Doherty power amplifier according to claim 6 for expanding bandwidth, feature exist
In in the front end of primary input match circuit equipped with the quarter-wave delay line phase in 50 Europe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610888690.8A CN106411265B (en) | 2016-10-12 | 2016-10-12 | A kind of asymmetric Doherty power amplifier and its implementation for expanding bandwidth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610888690.8A CN106411265B (en) | 2016-10-12 | 2016-10-12 | A kind of asymmetric Doherty power amplifier and its implementation for expanding bandwidth |
Publications (2)
| Publication Number | Publication Date |
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| CN107493081B (en) * | 2017-06-27 | 2020-08-18 | 广东顺德中山大学卡内基梅隆大学国际联合研究院 | Doherty power amplifier for improving bandwidth by using broadband type composite left/right-handed transmission line |
| CN108599785B (en) * | 2018-03-30 | 2019-11-19 | 维沃移动通信有限公司 | The method of adjustment and terminal of radio frequency system, transmission power based on millimetre-wave attenuator |
| CN108763640B (en) * | 2018-04-20 | 2022-03-22 | 杭州电子科技大学 | High-efficiency and high-back-off Doherty power amplifier and design method thereof |
| CN109672411B (en) * | 2018-12-19 | 2023-02-28 | 重庆邮电大学 | Asymmetric broadband Doherty power amplifier suitable for 5G low-frequency band full frequency band |
| CN113014205A (en) * | 2019-12-19 | 2021-06-22 | 苏州华太电子技术有限公司 | Asymmetric Doherty power amplifier and matching circuit thereof and implementation method of matching circuit |
| CN113904628A (en) * | 2021-09-23 | 2022-01-07 | 深圳飞骧科技股份有限公司 | Broadband Doherty power amplifier and implementation method |
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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: Asymmetric Doherty power amplifier for broadening bandwidth and implementation method thereof Granted publication date: 20190312 License type: Common License Record date: 20200511 |