WO2011137832A2 - Circuit de doherty, circuit de doherty à n voies et équipement de station de base correspondant - Google Patents

Circuit de doherty, circuit de doherty à n voies et équipement de station de base correspondant Download PDF

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Publication number
WO2011137832A2
WO2011137832A2 PCT/CN2011/074774 CN2011074774W WO2011137832A2 WO 2011137832 A2 WO2011137832 A2 WO 2011137832A2 CN 2011074774 W CN2011074774 W CN 2011074774W WO 2011137832 A2 WO2011137832 A2 WO 2011137832A2
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WO
WIPO (PCT)
Prior art keywords
input
load
doherty circuit
doherty
port
Prior art date
Application number
PCT/CN2011/074774
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English (en)
Chinese (zh)
Other versions
WO2011137832A3 (fr
Inventor
夏宏亮
曾军
吴乔
武胜波
燕忌
李松
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华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2011/074774 priority Critical patent/WO2011137832A2/fr
Priority to CN201180000992.2A priority patent/CN102265506B/zh
Publication of WO2011137832A2 publication Critical patent/WO2011137832A2/fr
Publication of WO2011137832A3 publication Critical patent/WO2011137832A3/fr

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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

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a Doherty Doherty circuit, a multi-channel Tohti Doherty circuit, and a base station device.
  • the radio frequency power amplifying circuit in the base station device adopts more and more Doherty amplifying circuit, which greatly improves the power amplifier efficiency of the base station device, thereby reducing heat consumption, reducing operator operating cost, and improving the base station.
  • the reliability of the device also reduces the cost of the entire base station device.
  • the Doherty circuit is generally optimized by optimizing the microstrip power splitter at the input of the Doherty circuit.
  • the optimization process of the prior art solution is complicated.
  • An aspect of the present invention provides a Taoherty Doherty circuit, the Doherty circuit comprising: a first port of an input bridge as an input, a fourth port being grounded through an isolated end load; and a second port connected to an input of an average power amplification branch
  • the third port is connected to the input end of the peak power amplification branch;
  • the mean power amplification branch includes a mean power amplifier;
  • the peak power amplification branch includes a peak power amplifier;
  • the mean power amplification branch and the peak The power amplification branch is connected to the second load through the impedance transformation network;
  • the isolated end load of the input bridge is a non-matching load.
  • Another aspect of the invention provides a multi-way Tauhti Doherty circuit comprising at least two of said Doherty circuits.
  • Another aspect of the present invention also provides a base station apparatus, the base station apparatus including the Doherty circuit.
  • the base station apparatus including the Doherty circuit.
  • the characteristics of the echo power of the peak power amplifier operating in the class C are different under different input powers, and the power distribution of the input bridge is different under the mismatched load.
  • the characteristic is that the isolated termination of the input bridge is set to a non-matching load, so that the input power distribution ratio of the mean power amplifier and the peak power amplifier of the Doherty circuit changes with power, thereby achieving the purpose of optimizing the efficiency and linearity of the Doherty circuit. .
  • FIG. 1 is a schematic diagram of a Doherty circuit according to Embodiment 1 of the present invention.
  • FIG. 2 is a schematic diagram of a Doherty circuit according to a second embodiment of the present invention.
  • the embodiment of the invention provides a Doherty circuit, which can optimize the Doherty circuit and improve the linearity and efficiency of the Doherty circuit.
  • the Doherty circuit includes: an input bridge 1 (Doherty bridge in Fig. 1), a mean power amplification branch 2, a peak power amplification branch 3, an impedance transformation network 4, an isolated end load 5, and a second load 6.
  • the first port P1 of the input bridge 1 is an input end, the fourth port P4 is grounded through the isolated end load 5; the second port P2 is connected to the input end of the average power amplification branch 2; the third port P3 is connected to a peak power amplification branch The input of way 3.
  • the mean power amplification branch 2 may comprise a mean power amplifier.
  • the peak power amplification branch 3 may comprise a peak power amplifier.
  • the mean power amplifying branch 2 and the peak power amplifying branch 3 are connected to each other and connected to the second load 6 through the impedance transforming network 4.
  • the isolated end load 5 of the input bridge 1 is a non-matching load.
  • the characteristics of the echo power of the peak power amplifier operating in the class C are different under different input powers, and the power distribution of the input bridge is different under the mismatched load.
  • the characteristic is that the isolated termination of the input bridge is set to a non-matching load, so that the input power distribution ratio of the mean power amplifier and the peak power amplifier of the Doherty circuit changes with power, thereby achieving the purpose of optimizing the efficiency and linearity of the Doherty circuit.
  • . 2 is a schematic diagram of a Doherty circuit according to a second embodiment of the present invention.
  • the Doherty circuit includes: an input bridge 10, a mean power amplification branch, a peak power amplification branch, an impedance transformation network, an isolated end load 70, and a second load 80.
  • the mean power amplification branch includes a mean power amplifier 20 (i.e., a main power amplifier) and a second wavelength line 50.
  • the peak power amplification branch includes a peak power amplifier 30 (i.e., an auxiliary power amplifier) and a first wavelength line 40.
  • the impedance transformation network is a third wavelength line 60.
  • the first port P1 of the input bridge 10 is an input end, as an input end of the Doherty circuit; the fourth port P4 of the input bridge 10 is an isolated end, and the load 70 is grounded through the isolated end;
  • the second port P2 of the input bridge 10 is a coupling end connected to the input end of the averaging power amplifier 20; the third port P3 of the input bridge 10 is a through end, connected to the first wavelength line 40. One end.
  • the other end of the first wavelength line 40 is coupled to the input of the peak power amplifier 30.
  • An output of the mean power amplifier 20 is coupled to one end of the second wavelength line 50.
  • the output end of the peak power amplifier 30 and the other end of the second wavelength line 50 are short-circuited together with one end of the third wavelength line 60.
  • the other end of the third wavelength line 60 is connected to the second load 80.
  • the power supply terminal of the averaging power amplifier 20 and the power terminal of the peak power amplifier 30 are both connected to the operating power source Vcc.
  • the Doherty circuit is composed of two power amplifiers: a mean power amplifier 20 and a peak power amplifier 30.
  • the mean power amplifier 20 operates in class B or class AB, and the peak power amplifier 30 operates in class C.
  • the averaging power amplifier 20 operates directly, and the peak power amplifier 30 needs to reach a set peak to operate.
  • the second wavelength line 50 connected to the mean power amplifier 20 is an impedance transformation network, the purpose of which is to reduce the apparent impedance of the mean power amplifier 20 when the peak power amplifier 30 is operating to ensure the peak power amplifier When 30 works, the impedance of the active load composed of the circuit behind it becomes lower, so that the current output from the average power amplifier 20 becomes larger.
  • the first wavelength line 40 is set before the peak power amplifier 30 to produce 90. Phase shift, as shown in Figure 2. It should be noted that the first wavelength line 40 is used to make the outputs of the mean power amplifier 20 and the peak power amplifier 30 in phase. Therefore, the specification of the first wavelength line 40 can be arbitrarily set according to actual needs.
  • Both the second wavelength line 50 and the third wavelength line 60 are used as an impedance transformation network.
  • the second wavelength line 50 and the third wavelength line 60 may each adopt a quarter-wavelength line.
  • the averaging power amplifier 20 operates in class B. When the input signal is relatively small, only the averaging power amplifier 20 is in operation. When the output voltage of the mean power amplifier 20 tube reaches the peak saturation point, the theoretical efficiency can reach 78.5%. If the excitation is doubled at this time, the tube will saturate when it reaches half of the peak, and its efficiency will reach a maximum of 78.5%.
  • the peak power amplifier 30 starts to work with the average power amplifier 20.
  • the peak power amplifier 30 operates in class C with a threshold set to half the excitation signal voltage.
  • the introduction of the peak power amplifier 30 is such that the load is reduced from the perspective of the averaging power amplifier 20 because the effect of the peak power amplifier 30 on the load is equivalent to a negative impedance in series, so even the average power
  • the output voltage of the amplifier 20 is saturated, but the output power continues to increase due to the decrease in load (i.e., the current flowing through the load becomes larger).
  • the peak power amplifier 30 also reaches its maximum point of efficiency, so that the efficiency of the two power amplifiers is much higher than the efficiency of a single Class B power amplifier.
  • the maximum efficiency of a single power amplifier is 78.5% at the peak, and for the circuit shown in Figure 2, 78.5% efficiency occurs at half the peak. Therefore, in the Doherty circuit of the structure shown in Figure 2, each power amplifier can achieve the maximum output power, and the entire circuit can achieve 4 ⁇ high efficiency.
  • the first port and the second port are matched ports, that is, the reflection coefficient ⁇ 1 of the first port and the reflection coefficient ⁇ 2 of the second port are 0; and the load connected to the third port and the fourth port
  • the reflection coefficients are respectively ⁇ 3 and ⁇ 4 .
  • IS21I and IS31I are the powers input to the mean power amplifier and the peak power amplifier, respectively. Theoretically, when the input bridge is isolated and terminated to match the load, the reflection coefficient of the fourth port ⁇
  • the reflection coefficient of the isolated terminal ie, the fourth port
  • the power reflected from the third port to the isolated terminal is reflected back to the bridge, making IS21I and IS31I It will change as the reflection coefficients ⁇ 3 and ⁇ 4 change.
  • the isolated end of the input bridge 10 is connected to a non-matching load, and it can be said that the reflection coefficient of the isolated end of the input bridge 10 is ⁇ 4 ⁇ 0.
  • the isolated end load 70 is a non-50 ⁇ load or a non-50 ⁇ equivalent load, so that the isolated end is a non-matching load, and the reflection coefficient of the isolated end ⁇ 4 ⁇ 0.
  • the characteristics of the echo power at different input powers of the peak power amplifier 30 operating in the class C are different from those of the input bridge under the mismatched load.
  • the characteristic is that the isolated termination of the input bridge 10 is terminated to a non-matching load, so that the input power distribution ratio of the mean power amplifier 20 and the peak power amplifier 30 of the Doherty circuit changes with power, thereby optimizing the efficiency of the Doherty circuit.
  • linear purpose in the following, by analyzing the input power of the two power amplifiers, the influence of the input bridge 10 isolated termination termination load on the performance of the Doherty circuit in the embodiment of the present invention will be described in detail.
  • the peak power amplifier 30 When a small power is input, the peak power amplifier 30 is in a completely closed state, and its input impedance echo, that is, which output terminal of the input bridge does not match, causes reflection at the mismatched port, and the reflected signal enters Input the input and isolation of the bridge, where the input of the bridge is connected to the load and absorbs the reflected power.
  • the signal reflected by the output end cannot be absorbed at the isolated end, thereby causing reflection again.
  • the reflected signal enters the mean power amplifier 20 and the peak power amplifier 30, and the signal that again enters the peak power amplifier 30 branch will repeat the previous reflection, with the end result that the signal entering the peak power amplifier 30 branch will partially enter the mean power amplifier.
  • the branch of 20 (the other part is absorbed by the input of the bridge). In this way, in the case of low power, the power entering the branch of the peak power amplifier 30 will be reduced, so that the peak power amplifier 30 has better switching characteristics at a lower power, and the average power amplifier 20 can be improved. Its efficiency.
  • the mean power amplifier 20 will get More input power increases the gain of the Doherty circuit, which reduces the output power of the input driver stage of the input bridge 10, improving the efficiency of the entire Doherty circuit.
  • the peak power amplifier 30 slowly turns on, the input echo thereof continuously improves, the power distribution ratio of the input bridge 10 will constantly change, and the power entering the peak power amplifier 30 branch increases.
  • the peak power amplifier 30 branch has a better load pulling effect on the average power amplifier. As a result, not only can the efficiency of the Doherty circuit be improved, but also the linearity of the circuit can be effectively improved.
  • the load connected to the terminal changes, so that the traditional Doherty circuit has its input power distribution ratio unchanged at different input powers.
  • the isolated end load of the input bridge in the conventional Doherty circuit is changed from the matched load to the unmatched load, so that the reflection coefficient of the isolated end is ⁇ 4 ⁇ 0. Therefore, the output power distribution ratio of the input bridge according to the embodiment of the present invention will vary depending on the degree of matching of the load connected to the output terminal.
  • the Doherty circuit according to the embodiment of the present invention by improving the input bridge, makes the input power distribution ratio of the entire circuit more suitable for the ideal characteristics of the Doherty circuit, not only improves the efficiency of the circuit, but also improves the partial linearity of the circuit.
  • the mean power amplification branch may further include a power splitter and at least two average power amplifiers, and the second port of the input bridge is connected to at least two average values by using a power splitter.
  • the input of the power amplifier may further include a power splitter and at least two average power amplifiers, and the second port of the input bridge is connected to at least two average values by using a power splitter.
  • the peak power amplification branch further includes a power splitter and at least two peak power amplifiers, and the third port of the input bridge is connected to the input ends of the at least two peak power amplifiers through the power splitter.
  • the peak power amplifier and the peak power amplifier are the same power of the peak power amplifier and the peak power amplifier of the same conventional input circuit; the asymmetric Doherty The power of the peak power amplifier and the peak power amplifier of the circuit are different.
  • the embodiment of the present invention further provides a multi-stage Doherty circuit.
  • the multi-stage Doherty circuit is based on the symmetric or asymmetric Doherty circuit, and the average power amplification branch includes a power divider and at least two average power amplifiers.
  • the second port of the bridge is connected to two or more equal power amplifiers through a power splitter, and/or the peak power amplification branch includes a power splitter and at least two peak power amplifiers, and the third port of the input bridge passes the power
  • the divider is connected to two or more peak power amplifiers.
  • connection structure of the impedance conversion network or the phase modulation network and the power amplifier in the specific mean power amplification branch or the peak power amplification branch does not affect the implementation and effect of the embodiment of the present invention. It may not be limited in the embodiment of the invention.
  • An embodiment of the present invention further provides an N-Way Doherty circuit, where the
  • the embodiment of the present invention further provides a base station device, where the radio frequency power amplifying circuit of the base station device is implemented by using the Doherty circuit according to the foregoing embodiment of the present invention.
  • the radio frequency power amplifying circuit (Doherty circuit) provided by the embodiment of the present invention can also be applied to other communication fields, such as radar, satellite communication, and the like.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

L'invention concerne un circuit de Doherty, un circuit de Doherty à N voies et un équipement de station de base correspondant. Le circuit de Doherty comporte un premier port (P1) d'un pont d'entrée (1) servant d'extrémité d'entrée, un quatrième port (P4) mis à la terre par une charge (5) à l'extrémité isolée, un second port (P2) connecté à une extrémité d'entrée d'un circuit de dérivation (2) d'amplification de puissance de valeur moyenne, un troisième port (P3) connecté à une extrémité d'entrée d'un circuit de dérivation (3) d'amplification de puissance de valeur de crête. Le circuit de dérivation (2) d'amplification de puissance de valeur moyenne comprend un amplificateur de puissance de valeur moyenne (20). Le circuit de dérivation (3) d'amplification de puissance de valeur de crête comprend un amplificateur de puissance de valeur crête (30). Une fois le circuit de dérivation (2) d'amplification de puissance de valeur moyenne connecté au circuit de dérivation (3) d'amplification de puissance de valeur de crête, le circuit de dérivation (2) est connecté à une seconde charge (6) par un réseau de transformation d'impédance (4). La charge (5) située à l'extrémité isolée du pont d'entrée (1) est une charge non appariée. Le circuit et l'équipement de station de base permettent l'optimisation, ainsi que l'amélioration de la linéarité et de l'efficacité du circuit de Doherty.
PCT/CN2011/074774 2011-05-27 2011-05-27 Circuit de doherty, circuit de doherty à n voies et équipement de station de base correspondant WO2011137832A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CN2011/074774 WO2011137832A2 (fr) 2011-05-27 2011-05-27 Circuit de doherty, circuit de doherty à n voies et équipement de station de base correspondant
CN201180000992.2A CN102265506B (zh) 2011-05-27 2011-05-27 陶赫蒂Doherty电路、多路陶赫蒂Doherty电路和基站设备

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2011/074774 WO2011137832A2 (fr) 2011-05-27 2011-05-27 Circuit de doherty, circuit de doherty à n voies et équipement de station de base correspondant

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WO2011137832A2 true WO2011137832A2 (fr) 2011-11-10
WO2011137832A3 WO2011137832A3 (fr) 2012-04-26

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015180064A1 (fr) * 2014-05-28 2015-12-03 华为技术有限公司 Amplificateur de puissance doherty et émetteur

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106982181A (zh) * 2016-01-18 2017-07-25 中兴通讯股份有限公司 耦合网络、功放装置及通信终端

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020135425A1 (en) * 2001-03-21 2002-09-26 Postech Foundation Full output matching apparatus of a microwave doherty amplifier
CN1400742A (zh) * 2001-06-08 2003-03-05 Trw公司 微波功率放大器
JP2006166141A (ja) * 2004-12-08 2006-06-22 Matsushita Electric Ind Co Ltd ドハティ増幅器
CN101582682A (zh) * 2009-06-12 2009-11-18 华为技术有限公司 一种功率放大器和发射机
CN201398179Y (zh) * 2009-03-31 2010-02-03 武汉正维电子技术有限公司 用于cdma基站系统功率放大器的末级二路放大器
CN101783652A (zh) * 2010-01-18 2010-07-21 顾晓龙 一种易于实现的多级Doherty功放

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020135425A1 (en) * 2001-03-21 2002-09-26 Postech Foundation Full output matching apparatus of a microwave doherty amplifier
CN1400742A (zh) * 2001-06-08 2003-03-05 Trw公司 微波功率放大器
JP2006166141A (ja) * 2004-12-08 2006-06-22 Matsushita Electric Ind Co Ltd ドハティ増幅器
CN201398179Y (zh) * 2009-03-31 2010-02-03 武汉正维电子技术有限公司 用于cdma基站系统功率放大器的末级二路放大器
CN101582682A (zh) * 2009-06-12 2009-11-18 华为技术有限公司 一种功率放大器和发射机
CN101783652A (zh) * 2010-01-18 2010-07-21 顾晓龙 一种易于实现的多级Doherty功放

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015180064A1 (fr) * 2014-05-28 2015-12-03 华为技术有限公司 Amplificateur de puissance doherty et émetteur
US10084413B2 (en) 2014-05-28 2018-09-25 Huawei Technologies Co., Ltd. Doherty power amplifier and transmitter

Also Published As

Publication number Publication date
CN102265506B (zh) 2013-08-28
CN102265506A (zh) 2011-11-30
WO2011137832A3 (fr) 2012-04-26

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