CN107493074A - Doherty power amplifiers - Google Patents
Doherty power amplifiers Download PDFInfo
- Publication number
- CN107493074A CN107493074A CN201610414893.3A CN201610414893A CN107493074A CN 107493074 A CN107493074 A CN 107493074A CN 201610414893 A CN201610414893 A CN 201610414893A CN 107493074 A CN107493074 A CN 107493074A
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- Prior art keywords
- circuit
- defect
- power amplifiers
- power
- doherty power
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Classifications
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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
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
A kind of Doherty power amplifiers provided by the invention.Circuit includes：Power distributing circuit, power amplification circuit and combining output circuit.Power amplification circuit is connected to the output end of power distributing circuit.Combining output circuit is connected to the output end of power amplification circuit.Combining output circuit filters rheostat for defect.So as to, the Doherty power amplifiers combining of the present invention is exported while impedance matching is reached, the interference of out-of-band harmonics can effectively be suppressed, have the advantages that area is small, Insertion Loss is low, power amplification efficiency improves, dispersion reduces in frequency band by filtering rheostat with setting defect.
Description
Technical field
The present invention relates to electronic circuit technology field, more particularly to a kind of Doherty power amplifiers.
Background technology
With increasingly fierce daily competition, while in face of current 4G/5G continuous development, the power amplification unit of base station
Performance height be the principal focal point competed in the industry.At present, most widely used mainstream technology is exactly Doherty power amplifier skills
Art, most of power amplifier producer all have begun to produce in batches, using Doherty power amplifiers.Therefore, how on the basis of the technology
Further reduce power amplifier size, improving power amplifier performance turns into the main competitiveness focus of field of Communications.
As shown in Figure 1, it is the schematic diagram of traditional two-way Doherty power amplifiers.Traditional two-way Doherty power amplifiers
Circuit is formed by two to multiple power tubes 102, is divided into main power tube and auxiliary power amplifier pipe.Wherein, main power tube and auxiliary work(
Put pipe and be operated in different working conditions respectively, the lifting of efficiency is realized by impedance modulation technology.Exported in power tube combining
Place generally has micro-strip combining line 103,104 to realize impedance Transformation Matching.For example, in a typical Doherty power amplifier
In, there is 35 ohm of low-resistance microstrip line 103 at the combining of two power tubes output to realize impedance matching.
Because small-signal can produce harmonic signal after Doherty power amplifier is amplified, these signals can be set to other
It is standby to produce interference, and because the energy loss of harmonic wave causes efficiency of amplitude to reduce.Therefore, harmonics restraint is to power amplifier
It can have a great influence.
However, in order to suppress influence of the harmonic wave to power amplifier properties, traditional Doherty power amplifiers are in the design
Increase wave filter in 50 ohm microstrips typically after combining output to suppress harmonic wave, this can cause power amplifier output end microstrip line
Size increases, differential loss increase, and then whole power amplification efficiency is reduced.And these devices all can be in printed circuit board (PCB) (Printed
Circuit Board, PCB) on take certain space, inevitably result in the PCB sizes increase of power amplifier, and make
The cost of Doherty power amplifiers improves.
The content of the invention
It is a primary object of the present invention to propose a kind of Doherty power amplifiers, power amplifier size can be reduced, reduced
The cost of power amplifier, improve harmonics restraint efficiency and power amplification efficiency.
To achieve the above object, a kind of Doherty power amplifiers provided by the invention, the circuit include：Power distribution
Circuit, power amplification circuit and combining output circuit, the power amplification circuit are connected to the defeated of the power distributing circuit
Go out end, the combining output circuit is connected to the output end of the power amplification circuit, and the combining output circuit is for defect
Filter rheostat.
Alternatively, filter to the defect rheostat with including defect, microstrip line and positioned at the defect and described
Medium between microstrip line, the defect it is formed on the grounding plate with the microstrip line construction.
Alternatively, the microstrip line includes the line of multiple sizes, to carry out impedance conversion.
Alternatively, tie at least one periodicity defect for including being etched on the grounding plate to the defect
Structure.
Alternatively, at least one equivalent inductance and at least one equivalent capacity are distributed as the periodicity defect.
Alternatively, the frequency response prototype phase of the amplitude-frequency response on the signal period defect ground and single order Butterworth filter
Closely.
Alternatively, the equivalent capacity on the signal period defect ground isEquivalent inductance is
Alternatively, the output end matching of the combining output circuit is 50 ohm.
Alternatively, input signal is separated into multiple signals by the power distributing circuit, and is respectively fed to the work(
In rate amplifier.
Alternatively, the power amplifier receives the multiple signals that the power distributing circuit is sent, and distributes to master and put
Big device and at least one from amplifier, the main amplifier and described at least one will input the signal of itself from amplifier respectively
Exported after being amplified to the Combining Circuit.
Doherty power amplifiers proposed by the present invention, by setting power amplification electricity in the output end of power distributing circuit
Road, and the output end of power amplification circuit filter rheostat with setting defect, are realizing that impedance converts same by microstrip line
When, by defect realize the suppression to high-order harmonic wave.So as to while impedance matching is reached, can effectively suppress band
The interference of outer harmonic wave, by filter while defect is set rheostat have area is small, Insertion Loss is low, power amplification efficiency improves, in frequency band from
The advantages that divergence reduces.
Brief description of the drawings
Fig. 1 is the schematic diagram of traditional Doherty power amplifiers；
The schematic diagram for the Doherty power amplifiers that Fig. 2 provides for present pre-ferred embodiments, including combining output circuit；
Fig. 3 is the structural representation of combining output circuit in Fig. 2, combining output circuit with including defect, microstrip line and Jie
Matter；
Fig. 4 is the schematic cross-section of combining output circuit in Fig. 3；
Fig. 5 is the structural representation of microstrip line in Fig. 3；
Fig. 6 is the structural representation on defect ground in Fig. 3；
Fig. 7 is the equivalent circuit on signal period defect ground；
Fig. 8 is the equivalent circuit of single order Butterworth filter；
Fig. 9 is the structural representation on signal period defect ground in an example of the invention；
Figure 10 is the structural representation of microstrip line in Fig. 9.
The realization, functional characteristics and advantage of the object of the invention will be described further referring to the drawings in conjunction with the embodiments.
Embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
Fig. 2 is refer to, the schematic diagram of the Doherty power amplifiers provided for present pre-ferred embodiments.As shown in Fig. 2
The Doherty power amplifiers include power distributing circuit 201, power amplification circuit 202 and combining output circuit 203.Wherein,
Power amplification circuit 202 is connected to the output end of power distributing circuit 201, and combining output circuit 203 is connected to power amplification electricity
The output end on road 202.
Power distributing circuit 201, for input signal to be separated into N (1,2,3 ... N) road signal, be respectively fed to by
In main amplifier and the power amplification circuit 202 formed from amplifier.Wherein, N is the natural number more than or equal to 2, is amplified based on N
Device and from amplifier number sum.
Power amplification circuit 202, it is connected with power distributing circuit 201, including a main amplifier, more than one is from amplification
Input and output matching circuit corresponding to device and each amplifier.Main amplifier and the signal of itself will be inputted respectively from amplifier
Exported after being amplified to combining output circuit 203.Generally, main amplifier and different work shapes is respectively at from amplifier
State, such as：Main amplifier can be operated in AB class states, and booster amplifier can be operated in C class states.
Combining output circuit 203, for the N roads signal after amplification to be synthesized into signal output all the way, and complete output end
Impedance conversion.
Specifically, because different power amplification circuits 202 in combining point has different impedance operators, and it is typically low
Impedance rather than 50 ohm, and can be matched as 50 ohm by the output end of combining output circuit 203, therefore, combining output
Circuit 203 possesses the function of realizing impedance conversion.
In the present embodiment, combining output circuit 203 be defect filter rheostat, not only with impedance mapping function,
And suppress function, the particularly suppression to high-order harmonic wave with broadband harmonic.
As shown in Figure 3 and Figure 4, it is the structural representation and sectional view of combining output circuit.Combining output circuit includes lacking
Fall into ground 320, microstrip line 330 and positioned at defect the medium 340 between 320 and microstrip line 330.320 it is formed at tool to defect
On the grounding plate for having the structure of microstrip line 330, it is with including being etched at least one periodicity defect on grounding plate
Structure.
As shown in figure 5, being the structural representation of microstrip line 330, in Figure 5, microstrip line 330 is by various sizes of line 331
Formed with line 332.In other embodiments, the size of microstrip line 330 is mainly hindered by working frequency, the parameter of medium 340, matching
A variety of conditional parameter variables such as anti-, bandwidth, amount of suppression, ripple, transimission power determine.These parameters are according to actual requirement
Determine, the present invention is not specifically limited herein.
Please in combination with Fig. 3 and Fig. 6,320 include at least one periodicity defect ground structure to defect, and diverse location
Be distributed as periodicity defect equivalent inductance (such as 301,302,303,304,307-310) and electric capacity (such as 305,306), its is equivalent
Circuit is as shown in fig. 7, equivalent circuit for signal period defect ground.
Because the amplitude-frequency response of signal period defect ground structure has band-stop response, this and single order Butterworth filter
Frequency response prototype it is close, can utilize its model carry out Approximate Design, equivalent circuit such as Fig. 8 institutes of single order Butterworth filter
Show.
According to Fig. 8 equivalent circuit, it can be deduced that equation below 1, formula 2 and formula 3：
XL=ω ' Z0g1Formula 2
Wherein, ω0、ω’、g1、Z0Respectively resonant frequency, normalization cut-off frequency, up to special Butterworth low pass filter prototype
Value 1 and standard port impedance.
For the signal period defect shown in Fig. 8 equivalent circuit, LC loop reactances XLC：
According to filter frequencies transformation theory, can be obtained by formula 2 and formula 4：
It can be obtained by formula 3 and formula 5：
The equivalent capacity (C) and equivalent inductance (L) on the signal period defect ground being calculated according to formula 5 and formula 6,
Amplitude-frequency response is obtained to its structure simulation by full-wave electromagnetic simulation software, each response resonant frequency f0 and S21 is obtained and inserts
3 decibels of damage (dB) decay dot frequency fc, conversion are completed to calculate, and draw final model information and micro-strip line length.Thus use
Periodic equivalent structure, configured with filtering rheostatic stopband with adjusting general defect.
In order that the inventor of this area more fully understands the present invention, the Doherty power amplifiers with following example to the present invention
Circuit is illustrated.
Doherty power amplifiers two, triple-frequency harmonics, working frequency range is 2620MHz~2690MHz, and harmonic wave frequency range is 5240MHz
~8070MHz, full harmonic wave frequency range decay more than 20dB, the interior decay of working band are less than 0.05dB, 50 Europe are matched by 25 ohm
Nurse, the sheet material of medium use ROGERS5880.Calculated by formula 5 and formula 6 filter rheostatic prototype with determining defect,
The capacitor and inductor on independent periodicity defect ground, is then optimized fine setting using simulation software, obtains final filtering variable resistance
Circuit, as shown in Figure 9, be independent periodicity defect (911,912) composition the defects of 910 structural representation, and
As shown in Figure 10, it is the structural representation of the microstrip line 1010 obtained by simulation software.
Doherty power amplifiers provided by the invention, by being filtered with setting defect in the output end of power amplification circuit 202
Ripple rheostat, while realizing that impedance converts by microstrip line, by defect realize the suppression to high-order harmonic wave.So as to,
While impedance matching is reached, it can effectively suppress the interference of outer harmonic wave, the particularly suppression to two, triple-frequency harmonics.Separately
Outside, filtering rheostat with setting defect has the advantages that area is small, Insertion Loss is low, power amplification efficiency improves, dispersion reduces in frequency band.
The preferred embodiments of the present invention are these are only, are not intended to limit the scope of the invention, it is every to utilize this hair
The equivalent structure or equivalent flow conversion that bright specification and accompanying drawing content are made, or directly or indirectly it is used in other related skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of Doherty power amplifiers, it is characterised in that the circuit includes：Power distributing circuit, power amplification circuit with
And combining output circuit, the power amplification circuit are connected to the output end of the power distributing circuit, the combining output electricity
Road is connected to the output end of the power amplification circuit, and the combining output circuit filters rheostat for defect.
2. Doherty power amplifiers according to claim 1, it is characterised in that filtering rheostat to the defect includes
Defect, microstrip line and positioned at the defect the medium between the microstrip line, be formed at institute to the defect
State on the grounding plate of microstrip line construction.
3. Doherty power amplifiers according to claim 2, it is characterised in that the microstrip line includes multiple sizes
Line, to carry out impedance conversion.
4. Doherty power amplifiers according to claim 2, it is characterised in that include to the defect being etched in described
At least one periodicity defect ground structure on grounding plate.
5. Doherty power amplifiers according to claim 4, it is characterised in that be distributed as the periodicity defect to
A few equivalent inductance and at least one equivalent capacity.
6. Doherty power amplifiers according to claim 5, it is characterised in that the width on the signal period defect ground
Frequency response should be close with the frequency response prototype of single order Butterworth filter.
7. Doherty power amplifiers according to claim 6, it is characterised in that the signal period defect ground etc.
Imitating electric capacity isEquivalent inductance is
8. Doherty power amplifiers according to claim 1, it is characterised in that the output end of the combining output circuit
Match as 50 ohm.
9. Doherty power amplifiers according to claim 1, it is characterised in that the power distributing circuit, which will input, to be believed
Number multiple signals are separated into, and be respectively fed in the power amplifier.
10. Doherty power amplifiers according to claim 9, it is characterised in that the power amplifier receives the work(
The multiple signals that rate distributor circuit is sent, and distribute to main amplifier and at least one from amplifier, the main amplifier and institute
State it is at least one the signal for inputting itself is amplified respectively from amplifier after output to the Combining Circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610414893.3A CN107493074A (en) | 2016-06-12 | 2016-06-12 | Doherty power amplifiers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610414893.3A CN107493074A (en) | 2016-06-12 | 2016-06-12 | Doherty power amplifiers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107493074A true CN107493074A (en) | 2017-12-19 |
Family
ID=60642713
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610414893.3A Pending CN107493074A (en) | 2016-06-12 | 2016-06-12 | Doherty power amplifiers |
Country Status (1)
| Country | Link |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102142812A (en) * | 2010-12-17 | 2011-08-03 | 华为技术有限公司 | Doherty power amplifier |
| WO2012146007A1 (en) * | 2011-04-29 | 2012-11-01 | 中兴通讯股份有限公司 | Doherty power amplifier and implementation method therefor |
| CN202818232U (en) * | 2012-09-18 | 2013-03-20 | 中兴通讯股份有限公司 | Doherty power amplifying circuit |
| WO2015135104A1 (en) * | 2014-03-10 | 2015-09-17 | 华为技术有限公司 | Impedance matching circuit and transmitter |
-
2016
- 2016-06-12 CN CN201610414893.3A patent/CN107493074A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102142812A (en) * | 2010-12-17 | 2011-08-03 | 华为技术有限公司 | Doherty power amplifier |
| WO2012146007A1 (en) * | 2011-04-29 | 2012-11-01 | 中兴通讯股份有限公司 | Doherty power amplifier and implementation method therefor |
| CN202818232U (en) * | 2012-09-18 | 2013-03-20 | 中兴通讯股份有限公司 | Doherty power amplifying circuit |
| WO2015135104A1 (en) * | 2014-03-10 | 2015-09-17 | 华为技术有限公司 | Impedance matching circuit and transmitter |
Non-Patent Citations (1)
| Title |
|---|
| 柴豆豆等: "微波功率放大器DGS滤波电路研究", 《合肥师范学院学报》 * |
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Application publication date: 20171219 |
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