CN104993796A - Doherty power amplifier - Google Patents
Doherty power amplifier Download PDFInfo
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- CN104993796A CN104993796A CN201510357653.XA CN201510357653A CN104993796A CN 104993796 A CN104993796 A CN 104993796A CN 201510357653 A CN201510357653 A CN 201510357653A CN 104993796 A CN104993796 A CN 104993796A
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Abstract
The invention discloses a Doherty power amplifier, which comprises a power divider, a carrier amplifier circuit, a peak amplifier circuit and a combiner. The carrier amplifier circuit comprises a carrier phase delay line, a carrier amplifier and a carrier compensation line. The peak amplifier circuit comprises a peak phase delay line and a peak amplifier. The power divider equally outputs an input signal to the carrier amplifier circuit and the peak amplifier circuit. In comparison with the conventional Doherty power amplifier, the Doherty power amplifier adopting the novel peak amplifier has the advantages that, through optimization design of an output matching network of the peak amplifier, an output end of the peak amplifier is guaranteed to be at high impedance in a working bandwidth without using a peak compensation line, so that the power leakage caused by the carrier amplifier circuit is reduced, the wider bandwidth is realized, and the output power and the backspace efficiency are improved, and the Doherty power amplifier can be applied to a future broadband wireless communication system.
Description
Technical field
The present invention relates to communication technical field, be specifically related to a kind of Doherty power amplifier adopting novel peak amplifier output matching network.
Background technology
Along with the development of science and technology, modern wireless communication systems is towards higher bandwidth, faster speed and higher efficiency future development, the continuous increase of the universal and communication information amount of forth generation communication system (4G), proposes high request to wireless communication system.Modulation signal in Modern Communication System has more high peak-to-average power ratio, therefore requires that power amplifier is operated in higher back-off point, to ensure the linearity of signal, but the efficiency of power amplifier can be made obviously to reduce.
In order to adapt to the high peak-to-average power ratio of modulation signal, in the design of power amplifier, require that power amplifier still keeps higher efficiency when high-power rollback, Doherty power amplifier can have higher efficiency when back-off, both ensure that the linearity of communication signal, and higher operating efficiency can have been kept again.In traditional Doherty power amplifier, carrier amplifier is biased in AB class, peak amplifier is biased in C class, when small-signal, peak amplifier does not work, output is made to be open-circuit condition by adjustment peak compensation line, reduce the Power leakage of carrier amplifier, carrier amplifier is the twice of optimum impedance by λ/4 impedance transformation line by output, reaches high efficiency saturation condition in advance.Based on active load modulation principle, when peak amplifier starts conducting, carrier amplifier load impedance starts to reduce, power output increases further, when both output currents are identical, carrier amplifier and peak amplifier reach capacity simultaneously, and power output reaches maximum, make Doherty power amplifier keep higher efficiency in the scope of saturation power and back-off.
Found by research, in traditional Doherty power amplifier, peak amplifier makes output impedance keep high impedance in bandwidth of operation by peak compensation line, but peak compensation line is longer, the output impedance in bandwidth can be made to distribute overstepping the bounds of propriety loose, and it is far away to depart from centre frequency, the change of impedance is more violent, the Power leakage of carrier amplifier can be caused, have influence on power efficiency during Doherty power amplifier rollback.Therefore, how to reduce the length of peak compensation line, and then increase bandwidth of operation and improve the power efficiency of Doherty power amplifier, tool is of great significance.
Summary of the invention
The object of the present invention is to provide a kind of Doherty power amplifier, the i.e. method for designing of peak amplifier output matching network, to effectively reduce the length of peak compensation line, the output of peak amplifier when small-signal is made to be open-circuit condition, reduce the Power leakage that carrier amplifier exports, improve power output and the rollback efficiency of Doherty power amplifier.
In order to solve above technical problem, the concrete technical scheme that the present invention adopts is as follows:
A kind of Doherty power amplifier, comprises power divider (1), carrier wave amplifying circuit (2), peak value amplifying circuit (8) and mixer (13); It is characterized in that: described power divider (1) output is connected with carrier wave amplifying circuit (2) and peak value amplifying circuit (8) input respectively; Described carrier wave amplifying circuit (2) is sequentially connected in series by carrier phase compensating wire (3), carrier wave IMN (4), carrier amplifier (5), carrier wave OMN (6) and carrier compensation line (7) and forms; Described peak value amplifying circuit (8) is sequentially connected in series by peak phase compensating wire (9), peak I MN (10), peak amplifier (11) and peak value OMN (12) and forms; It is 35 ohm of λ/4 impedance transformation line (14) that described mixer (13) comprises characteristic impedance, be connected to the signal output part of described carrier wave amplifying circuit (2) and described peak value amplifying circuit (8), wherein, λ is wavelength corresponding to Doherty power amplifier operating frequency.
Signal averaging is exported to carrier wave amplifying circuit (2) and peak value amplifying circuit (8) by described power divider (1).
Described peak value amplifying circuit (8) is directly connected with 35 ohm of λ/4 impedance transformation line (14) in mixer (13).
Described carrier wave amplifying circuit (2) is connected with 35 ohm of λ/4 impedance transformation line (14) in mixer (13) by carrier compensation line (7).
The present invention has beneficial effect.Compared with prior art, technical scheme of the present invention has following beneficial effect:
(1) the present invention can reduce the Power leakage of carrier amplifier output terminal, improves power output and efficiency.In traditional Doherty power amplifier, peak amplifier output terminal is connected with mixer by peak compensation line, adding of peak compensation line, increase the length of matching network, distribution of impedance in bandwidth compares dispersion, more depart from centre frequency, impedance variation Shaoxing opera is strong, easily causes carrier amplifier Power leakage.The present invention is while peak compensation line is omitted in guarantee, and peak amplifier output terminal is high impedance, effectively prevents carrier amplifier Power leakage, improves power output and the efficiency of amplifier.
(2) invention increases bandwidth of operation.Traditional Doherty power amplifier can improve the efficiency of back-off very well, but is limited in, in narrow bandwidth (being generally less than the relative bandwidth of 10%), being unsuitable for the application scenario of wide bandwidth.The present invention, by novel peak amplifier output matching network, is high impedance at whole bandwidth range internal output impedance, and during minimizing small-signal, peak amplifier is on the impact of carrier amplifier power output, increases the bandwidth of amplifier.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present invention.
Fig. 2 is the graph of a relation of gain of the present invention, power output and input power.
Fig. 3 is the graph of a relation of efficiency of the present invention and power output.
In figure: 1 power divider, 2 carrier wave amplifying circuits, 3 carrier phase compensating wires, 4 carrier wave IMN, 5 carrier amplifiers, 6 carrier wave OMN, 7 carrier compensation lines, 8 peak value amplifying circuits, 9 peak phase compensating wires, 10 peak I MN, 11 peak amplifiers, 12 peak value OMN, 13 mixers, 1435 ohm of λ/4 impedance transformation lines.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in detail.
As shown in Figure 1, the present invention is a kind of Doherty power amplifier adopting novel peak value output matching network, comprises power divider 1, carrier wave amplifying circuit 2, peak value amplifying circuit 8 and mixer 13; Described carrier wave amplifying circuit 2 is sequentially connected in series by carrier phase compensating wire 3, carrier wave IMN4, carrier amplifier 5, carrier wave OMN6 and carrier compensation line 7 and forms; Described peak value amplifying circuit 8 is sequentially connected in series by peak phase compensating wire 9, peak I MN10, peak amplifier 11 and peak value OMN12 and forms; It is 35 ohm of λ/4 impedance transformation lines 14 that described mixer 13 comprises characteristic impedance, is connected to the signal output part of described carrier wave amplifying circuit 2 and described peak value amplifying circuit 8, and wherein, λ is wavelength corresponding to Doherty power amplifier operating frequency.The characteristic impedance of carrier phase compensating wire 3, peak phase compensating wire line 9 and carrier compensation line 7 is 50 ohm.
In above-mentioned Doherty power amplifier, described peak amplifier 11 is biased in C class, the output impedance of 50 ohm transmission line is connect by simulated peak amplifier 11, the length L of adjustment microstrip line, the output impedance of centre frequency is made to be distributed in low order end (open-circuit condition) in Smith chart, according to the output matching network of impedance matching methods design, by control total length be about L, the impedance of peak value OMN12 is optimized, first-harmonic corresponding to each frequency and each harmonic impedance is met in bandwidth, effectively reduce the length of peak compensation line even when omitting compensating wire, the output impedance of peak value amplifying circuit 8 still remains in higher scope in bandwidth, improve the output impedance in whole frequency band, reduce the Power leakage of carrier wave amplifying circuit 2.
Described carrier compensation line 7 act as and compensates the parasitic parameter such as carrier amplifier 5 capacitance of drain and lead-in inductance, and when making booster output rollback with mixer 13 acting in conjunction, power reaches capacity.Described carrier phase compensating wire 3 is adjust the signal phase inputing to two-way with the effect of peak phase compensating wire 9, makes two paths of signals export the phase of mixer 13 to, ensures peak power output.
Operation principle of the present invention is: by power divider 1, carrier wave amplifying circuit 2 and peak value amplifying circuit 8 are distributed in signal averaging, carrier wave amplifying circuit 2 is connected with ohm λ/4 impedance transformation line 14 of 35 in mixer 13 by carrier compensation line 7, shorten the length of the transmission line of output, thus reduce the loss of output.During small-signal, peak amplifier 11 does not work, and eliminates compensating wire by peak value OMN12, reduce the fluctuation of bandwidth internal impedance, peak value amplifying circuit 8 output is open-circuit condition, effectively reduces the Power leakage of carrier wave amplifying circuit 2, improves power output and the rollback efficiency of power amplifier.
Doherty power amplifier bandwidth of operation in conjunction with the inventive method is 2.3-2.8GHz, the power tube of carrier wave amplifying circuit 2 and peak value amplifying circuit 8 adopts the HEMT power tube CGH40010 of CREE, carrier amplifier 5 is biased in AB class, and peak amplifier 11 is biased in C class.
Fig. 2 is the graph of a relation of gain of the present invention, power output and input power, as can be seen from the figure in the scope that relative bandwidth is 20% (2.3-2.8GHz), saturation output power (Output Power) is about 44dBm, and gain (Gain) fluctuation is within 2dB.Fig. 3 is the graph of a relation of efficiency of the present invention and power output, as can be seen from the figure, saturation output power (Output Power) and delivery efficiency (Efficiency) are about 43.5-44.4dBm and 66-71%, as back-off 9dBm, the average efficiency of Doherty power amplifier is 42%, efficiency variance in bandwidth, within 10%, achieves high rollback efficiency when wider bandwidth of operation and high-power rollback.
Claims (4)
1. a Doherty power amplifier, comprises power divider (1), carrier wave amplifying circuit (2), peak value amplifying circuit (8) and mixer (13); It is characterized in that: described power divider (1) output is connected with carrier wave amplifying circuit (2) and peak value amplifying circuit (8) input respectively; Described carrier wave amplifying circuit (2) is sequentially connected in series by carrier phase compensating wire (3), carrier wave IMN (4), carrier amplifier (5), carrier wave OMN (6) and carrier compensation line (7) and forms; Described peak value amplifying circuit (8) is sequentially connected in series by peak phase compensating wire (9), peak I MN (10), peak amplifier (11) and peak value OMN (12) and forms; It is 35 ohm of λ/4 impedance transformation line (14) that described mixer (13) comprises characteristic impedance, be connected to the signal output part of described carrier wave amplifying circuit (2) and described peak value amplifying circuit (8), wherein, λ is wavelength corresponding to Doherty power amplifier operating frequency.
2. a kind of Doherty power amplifier according to claim 1, is characterized in that: signal averaging is exported to carrier wave amplifying circuit (2) and peak value amplifying circuit (8) by described power divider (1).
3. a kind of Doherty power amplifier according to claim 1, is characterized in that: described peak value amplifying circuit (8) is directly connected with 35 ohm of λ/4 impedance transformation line (14) in mixer (13).
4. a kind of Doherty power amplifier according to claim 1, is characterized in that: described carrier wave amplifying circuit (2) is connected with 35 ohm of λ/4 impedance transformation line (14) in mixer (13) by carrier compensation line (7).
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 |
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| CN201510357653.XA CN104993796B (en) | 2015-06-25 | 2015-06-25 | A kind of Doherty power amplifier |
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| CN104993796A true CN104993796A (en) | 2015-10-21 |
| CN104993796B CN104993796B (en) | 2018-03-27 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107222173A (en) * | 2017-05-12 | 2017-09-29 | 清华大学 | Millimeter wave double frequency Doherty power amplifier based on single-frequency line |
| CN108023554A (en) * | 2016-11-04 | 2018-05-11 | 恩智浦美国有限公司 | Utilize the amplifier installation of rollback power optimization |
| CN108206674A (en) * | 2016-12-19 | 2018-06-26 | 中国科学院苏州纳米技术与纳米仿生研究所 | Doherty amplifiers with defect ground structure |
| CN109155612A (en) * | 2016-05-18 | 2019-01-04 | 三菱电机株式会社 | Doherty amplifier |
| CN111181509A (en) * | 2020-03-12 | 2020-05-19 | 安科讯(福建)科技有限公司 | 5G NR radio frequency power amplifier |
| CN111697981A (en) * | 2019-03-15 | 2020-09-22 | 安普林荷兰有限公司 | Amplifying device and amplifying system including the same |
| WO2024082823A1 (en) * | 2022-10-21 | 2024-04-25 | 深圳飞骧科技股份有限公司 | Method for determining electrical length of compensation line for main power amplifier in doherty architecture |
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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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2015
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109155612A (en) * | 2016-05-18 | 2019-01-04 | 三菱电机株式会社 | Doherty amplifier |
| CN109155612B (en) * | 2016-05-18 | 2022-05-10 | 三菱电机株式会社 | Doherty amplifier |
| CN108023554A (en) * | 2016-11-04 | 2018-05-11 | 恩智浦美国有限公司 | Utilize the amplifier installation of rollback power optimization |
| CN108023554B (en) * | 2016-11-04 | 2023-04-18 | 恩智浦美国有限公司 | Amplifier arrangement with back-off power optimization |
| CN108206674A (en) * | 2016-12-19 | 2018-06-26 | 中国科学院苏州纳米技术与纳米仿生研究所 | Doherty amplifiers with defect ground structure |
| 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 |
| CN107222173A (en) * | 2017-05-12 | 2017-09-29 | 清华大学 | Millimeter wave double frequency Doherty power amplifier based on single-frequency line |
| CN111697981A (en) * | 2019-03-15 | 2020-09-22 | 安普林荷兰有限公司 | Amplifying device and amplifying system including the same |
| CN111181509A (en) * | 2020-03-12 | 2020-05-19 | 安科讯(福建)科技有限公司 | 5G NR radio frequency power amplifier |
| 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 |
| WO2024082823A1 (en) * | 2022-10-21 | 2024-04-25 | 深圳飞骧科技股份有限公司 | Method for determining electrical length of compensation line for main power amplifier in doherty architecture |
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| CN104993796B (en) | 2018-03-27 |
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