CN104993796B - A kind of Doherty power amplifier - Google Patents
A kind of Doherty power amplifier Download PDFInfo
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- CN104993796B CN104993796B CN201510357653.XA CN201510357653A CN104993796B CN 104993796 B CN104993796 B CN 104993796B CN 201510357653 A CN201510357653 A CN 201510357653A CN 104993796 B CN104993796 B CN 104993796B
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- amplifying circuit
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- matching network
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Abstract
The invention discloses a kind of Doherty power amplifier, including power divider, carrier wave amplifying circuit, peak value amplifying circuit and combiner.Carrier wave amplifying circuit includes carrier phase delay line, carrier amplifier and carrier compensation line.Peak value amplifying circuit includes peak phase delay line and peak amplifier.Power divider averagely exports input signal to carrier wave amplifying circuit and peak value amplifying circuit.This is using the Doherty power amplifier of new peak amplifier relative to traditional Doherty power amplifier, pass through the optimization design to peak amplifier output matching network, in the case of without peak compensation line, ensure that peak amplifier output terminal is in high impedance in bandwidth of operation, and then reduce Power leakage caused by carrier wave amplifying circuit, realize broader bandwidth and improve power output and rollback efficiency, can be applied to future broadband wireless communication system.
Description
Technical field
The present invention relates to communication technical field, and in particular to a kind of using new peak amplifier output matching network
Doherty power amplifier.
Background technology
With the development of science and technology, modern wireless communication systems are towards higher bandwidth, faster speed and higher effect
Rate direction is developed, the popularization of forth generation communication system (4G) and the continuous increase of communication information amount, and wireless communication system is proposed
High request.Modulated signal in Modern Communication System has more high peak-to-average power ratio, therefore it is required that power amplifier be operated in it is higher
Back-off point, to ensure the linearity of signal, but the efficiency of power amplifier can be made substantially to reduce.
In order to adapt to the high peak-to-average power ratio of modulated signal, require power amplifier high-power in the design of power amplifier
Higher efficiency is still kept during rollback, Doherty power amplifier there can be higher efficiency in back-off, both ensure that
The linearity of communication signal, and can keep higher operating efficiency.Carrier amplifier is inclined in traditional Doherty power amplifier
Put in AB classes, peak amplifier is biased in C classes, and in small-signal, peak amplifier does not work, and is made by adjusting peak compensation line
Output end is in open-circuit condition, reduces the Power leakage of carrier amplifier, and carrier amplifier is converted by output end by the impedance of λ/4
Line is in twice of optimal impedance, reaches efficient saturation state in advance.Based on active load modulation principle, work as peak amplifier
Begin to turn on, carrier amplifier load impedance starts to reduce, and power output further increases, and when both output currents are identical, carries
Twt amplifier and peak amplifier reach saturation simultaneously, and power output reaches maximum, makes Doherty power amplifier in saturation
Higher efficiency is kept in the range of power and back-off.
Found by studying, in traditional Doherty power amplifier, peak amplifier makes output by peak compensation line
Impedance keeps high impedance in bandwidth of operation, but peak compensation line is longer, can be distributed the output impedance in bandwidth more scattered,
And off-center frequency is more remote, the change of impedance is more violent, can cause the Power leakage of carrier amplifier, have influence on
Power and efficiency when Doherty power amplifier retracts.Therefore, how to reduce the length of peak compensation line, and then increase work
Make bandwidth and improve the power and efficiency of Doherty power amplifier, tool is of great significance.
The content of the invention
It is an object of the invention to provide a kind of Doherty power amplifier, i.e. peak amplifier output matching network
Design method, to effectively reduce the length of peak compensation line, it is in open-circuit condition to make output end of the peak amplifier in small-signal,
The Power leakage of carrier amplifier output is reduced, improves the power output and rollback efficiency of Doherty power amplifier.
In order to solve the above technical problems, the concrete technical scheme that the present invention uses is as follows：
A kind of Doherty power amplifier, including power divider (1), carrier wave amplifying circuit (2), peak value amplifying circuit
And combiner (13) (8)；It is characterized in that：Power divider (1) output end respectively with carrier wave amplifying circuit (2) and peak value
Amplifying circuit (8) input connects；By carrier phase compensating line (3), carrier wave IMN, (input matches the carrier wave amplifying circuit (2)
Network) (4), carrier amplifier (5), carrier wave OMN (output matching network) (6) and carrier compensation line (7) be sequentially connected in series group
Into；The peak value amplifying circuit (8) is amplified by peak phase compensating line (9), peak I MN (input matching network) (10), peak value
Device (11) and peak value OMN (output matching network) (12) are sequentially connected in series composition；The combiner (13) includes characteristic impedance
For the impedance transformation line (14) of 35 ohm of λ/4, the letter of the carrier wave amplifying circuit (2) and the peak value amplifying circuit (8) is connected to
Number output end, wherein, λ is wavelength corresponding to Doherty power amplifier working frequency.
The power divider (1) exports signal averaging to carrier wave amplifying circuit (2) and peak value amplifying circuit (8).
The peak value amplifying circuit (8) is directly connected with the impedance transformation line (14) of 35 ohm of λ in combiner (13)/4.
The carrier wave amplifying circuit (2) is converted by the impedance of 35 ohm of λ in carrier compensation line (7) and combiner (13)/4
Line (14) connects.
The present invention has beneficial effect.Compared with prior art, technical scheme has the advantages that：
(1) present invention can reduce the Power leakage of carrier amplifier output terminal, improve power output and efficiency.Traditional
In Doherty power amplifier, peak amplifier output terminal is connected by peak compensation line with combiner, and peak compensation line adds
Enter, increase the length of matching network, the distribution of impedance in bandwidth is more dispersed, more off-center frequency, impedance variations Shaoxing opera
It is strong, easily cause carrier amplifier Power leakage.The present invention is while ensureing to omit peak compensation line, peak amplifier output terminal
In high impedance, carrier amplifier Power leakage is effectively prevented, improves the power output and efficiency of amplifier.
(2) invention increases bandwidth of operation.Traditional Doherty power amplifier can improve back-off very well
Efficiency, but (relative bandwidth for being generally less than 10%) is limited in narrow bandwidth, it is unsuitable for the application scenario of wide bandwidth.This hair
It is bright by new peak amplifier output matching network, be in high impedance in whole bandwidth scope internal output impedance, reduce small letter
Number when influence of the peak amplifier to carrier amplifier power output, increase the bandwidth of amplifier.
Brief description of the drawings
Fig. 1 is the structured flowchart of the present invention.
Fig. 2 is the graph of a relation of gain of the invention, power output and input power.
Fig. 3 is the efficiency of the present invention and the graph of a relation of power output.
In figure：1 power divider, 2 carrier wave amplifying circuits, 3 carrier phase compensating lines, 4 carrier wave IMN (input pair nets
Network), 5 carrier amplifiers, 6 carrier wave OMN (output matching network), 7 carrier compensation lines, 8 peak value amplifying circuits, 9 peak phases mend
Repay line, 10 peak I MN (input matching network), 11 peak amplifiers, 12 peak value OMN (output matching network), 13 combiners,
The impedance transformation line of 1435 ohm of λ/4.
Embodiment
Below in conjunction with the accompanying drawings, technical scheme is described in detail.
As shown in figure 1, the present invention is a kind of Doherty power amplifier using new peak value output matching network, bag
Include power divider 1, carrier wave amplifying circuit 2, peak value amplifying circuit 8 and combiner 13；The carrier wave amplifying circuit 2 is by carrier wave phase
Position compensating line 3, carrier wave IMN (input matching network) 4, carrier amplifier 5, carrier wave OMN (output matching network) 6 and carrier compensation
Line 7 is sequentially connected in series composition；The peak value amplifying circuit 8 is by peak phase compensating line 9, peak I MN (input matching network)
10th, peak amplifier 11 and peak value OMN (output matching network) 12 are sequentially connected in series composition；The combiner 13 includes characteristic
Impedance is the impedance transformation line 14 of 35 ohm of λ/4, is connected to the signal of the carrier wave amplifying circuit 2 and the peak value amplifying circuit 8
Output end, wherein, λ is wavelength corresponding to Doherty power amplifier working frequency.Carrier phase compensating line 3, peak phase are mended
The characteristic impedance for repaying line line 9 and carrier compensation line 7 is 50 ohm.
In above-mentioned Doherty power amplifier, the peak amplifier 11 is biased in C classes, is put by simulated peak
Big device 11 connects the output impedance of 50 ohm transmission lines, adjusts the length L of microstrip line, the output impedance of centre frequency is distributed in history
Low order end (open-circuit condition) in this close circle diagram, the output matching network (OMN) designed according to impedance matching methods, passes through control
Total length is L or so, and the impedance to peak value OMN (output matching network) 12 optimizes, and meets that each frequency is corresponding in bandwidth
Fundamental wave and each harmonic impedance, effectively reduce peak compensation line length even in the case where omitting compensating line, peak value
The output impedance of amplifying circuit 8 is remained in bandwidth in higher scope, is improved the output impedance in whole frequency band, is subtracted
The Power leakage of small carrier wave amplifying circuit 2.
The carrier compensation line 7 act as compensate the parasitic parameter such as the capacitance of drain of carrier amplifier 5 and lead-in inductance, and with
Power reaches saturation when the collective effect of combiner 13 makes the booster output retract.The carrier phase compensating line 3 and peak phase
The effect of compensating line 9 is signal phase of the adjustment input to two-way, two paths of signals is exported to the phase of combiner 13, protects
Demonstrate,prove peak power output.
The present invention operation principle be：Signal averaging is distributed to by carrier wave amplifying circuit 2 and peak value by power divider 1
Amplifying circuit 8, carrier wave amplifying circuit 2 are connected by the impedance transformation line 14 of carrier compensation line 7 and 35 ohm of λ in combiner 13/4
Connect, shorten the length of the transmission line of output end, so as to reduce the loss of output end.During small-signal, peak amplifier 11 is not
Work, compensating line is eliminated by peak value OMN (output matching network) 12, reduces the fluctuation of bandwidth internal impedance, peak value amplification electricity
The output end of road 8 is in open-circuit condition, effectively reduces the Power leakage of carrier wave amplifying circuit 2, improves the output of power amplifier
Power and rollback efficiency.
Doherty power amplifier bandwidth of operation with reference to the inventive method is 2.3-2.8GHz, the He of carrier wave amplifying circuit 2
The power tube of peak value amplifying circuit 8 uses CREE HEMT power tube CGH40010, and carrier amplifier 5 is biased in AB classes, peak value
Amplifier 11 is biased in C classes.
Fig. 2 is the graph of a relation of gain of the invention, power output and input power, as can be seen from the figure in relative bandwidth
It is about 44dBm for saturation output power (Output Power) in the range of 20% (2.3-2.8GHz), gain (Gain) is fluctuated
Within 2dB.Fig. 3 is the efficiency of the present invention and the graph of a relation of power output, it can be seen that saturation output power
(Output Power) and delivery efficiency (Efficiency) are about 43.5-44.4dBm and 66-71%, as back-off 9dBm
When, the average efficiency of Doherty power amplifier is 42%, and the efficiency variance in bandwidth realizes wider within 10%
High rollback efficiency when bandwidth of operation and high-power rollback.
Claims (4)
1. a kind of Doherty power amplifier, including power divider (1), carrier wave amplifying circuit (2), peak value amplifying circuit (8)
With combiner (13)；It is characterized in that：Power divider (1) output end is put with carrier wave amplifying circuit (2) and peak value respectively
Big circuit (8) input connection；The carrier wave amplifying circuit (2) is by carrier phase compensating line (3), carrier wave input matching network
（Input Matching Network,IMN）(4), carrier amplifier (5), carrier wave output matching network（Output
Matching Network,OMN）(6) and carrier compensation line (7) is sequentially connected in series composition；The peak value amplifying circuit (8) by
Peak phase compensating line (9), peak value input matching network（Input Matching Network,IMN）(10), peak amplifier
And peak value output matching network (11)（Output Matching Network,OMN）(12) it is sequentially connected in series composition；It is described
It is the impedance transformation line (14) of 35 ohm of λ/4 that combiner (13), which includes characteristic impedance, is connected to the carrier wave amplifying circuit (2) and institute
The signal output part of peak value amplifying circuit (8) is stated, wherein, λ is wavelength corresponding to Doherty power amplifier working frequency；
In above-mentioned Doherty power amplifier, the peak amplifier (11) is biased in C classes, passes through simulated peak amplifier (11)
The output impedance of 50 ohm transmission lines is connect, adjusts the length L of microstrip line, the output impedance of centre frequency is distributed in Smith's circle
Low order end in figure, the output matching network designed according to impedance matching methods（Output Matching Network,OMN）,
It is L by controlling total length, to peak value output matching network（Output Matching Network,OMN）（12）Impedance enter
Row optimization, fundamental wave corresponding to each frequency and each harmonic impedance are met in bandwidth, effectively reduces the length of peak compensation line,
The output impedance in whole frequency band is improved, reduces the Power leakage of carrier wave amplifying circuit (2).
A kind of 2. Doherty power amplifier according to claim 1, it is characterised in that：The power divider (1) will
Signal averaging is exported to carrier wave amplifying circuit (2) and peak value amplifying circuit (8).
A kind of 3. Doherty power amplifier according to claim 1, it is characterised in that：The peak value amplifying circuit (8)
Directly it is connected with the impedance transformation line (14) of 35 ohm of λ in combiner (13)/4.
A kind of 4. Doherty power amplifier according to claim 1, it is characterised in that：The carrier wave amplifying circuit (2)
It is connected by the impedance transformation line (14) of carrier compensation line (7) and 35 ohm of λ in combiner (13)/4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510357653.XA CN104993796B (en) | 2015-06-25 | 2015-06-25 | A kind of Doherty power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510357653.XA CN104993796B (en) | 2015-06-25 | 2015-06-25 | A kind of Doherty power amplifier |
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| Publication Number | Publication Date |
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| CN104993796A CN104993796A (en) | 2015-10-21 |
| CN104993796B true CN104993796B (en) | 2018-03-27 |
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| CN201510357653.XA Active CN104993796B (en) | 2015-06-25 | 2015-06-25 | A kind of Doherty power amplifier |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3461000B1 (en) * | 2016-05-18 | 2022-05-04 | Mitsubishi Electric Corporation | Doherty amplifier |
| CN108023554B (en) * | 2016-11-04 | 2023-04-18 | 恩智浦美国有限公司 | Amplifier arrangement with back-off power optimization |
| CN108206674B (en) * | 2016-12-19 | 2021-10-29 | 中国科学院苏州纳米技术与纳米仿生研究所 | Doherty amplifier with defected ground structure |
| CN107222173B (en) * | 2017-05-12 | 2020-06-19 | 清华大学 | Millimeter wave dual-frequency Doherty power amplifier based on single frequency line |
| NL2022750B1 (en) * | 2019-03-15 | 2020-09-22 | Ampleon Netherlands Bv | Amplifying device and amplifying system comprising the same |
| CN111181509B (en) * | 2020-03-12 | 2023-04-18 | 安科讯(福建)科技有限公司 | 5G NR radio frequency power amplifier |
| CN115577665A (en) * | 2022-10-21 | 2023-01-06 | 深圳飞骧科技股份有限公司 | Method for determining Doherty architecture main power amplifier compensation line electrical length |
Citations (2)
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|---|---|---|---|---|
| CN103840772A (en) * | 2013-12-03 | 2014-06-04 | 福建三元达通讯股份有限公司 | Circuit for improving Doherty power amplifier linearity by using CRLH-TL compensating line |
| CN104113286A (en) * | 2014-07-10 | 2014-10-22 | 大唐移动通信设备有限公司 | Doherty power amplification circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140132343A1 (en) * | 2011-06-20 | 2014-05-15 | Telefonaktiebolaget L M Ericsson (Publ) | Power amplifier based on doherty power amplifier |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103840772A (en) * | 2013-12-03 | 2014-06-04 | 福建三元达通讯股份有限公司 | Circuit for improving Doherty power amplifier linearity by using CRLH-TL compensating line |
| CN104113286A (en) * | 2014-07-10 | 2014-10-22 | 大唐移动通信设备有限公司 | Doherty power amplification circuit |
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| High-Efficiency GaN Doherty Power Amplifier for 100-MHz LTE-Advanced Application Based on Modified Load Modulation Network;Jing Xia等;《IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES》;20130831;文章第1部分-第6部分 * |
| 改进负载调制的GaNDoherty功率放大器及其线性化;夏景等;《微波学报》;20140228;第30卷(第1期);文章第1部分-第4部分 * |
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| CN104993796A (en) | 2015-10-21 |
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