WO2006041234A1 - Doherty amplifier using active phase splitter - Google Patents

Doherty amplifier using active phase splitter Download PDF

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Publication number
WO2006041234A1
WO2006041234A1 PCT/KR2004/003146 KR2004003146W WO2006041234A1 WO 2006041234 A1 WO2006041234 A1 WO 2006041234A1 KR 2004003146 W KR2004003146 W KR 2004003146W WO 2006041234 A1 WO2006041234 A1 WO 2006041234A1
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WO
WIPO (PCT)
Prior art keywords
amplifier
route
transistor
terminal
output
Prior art date
Application number
PCT/KR2004/003146
Other languages
English (en)
French (fr)
Inventor
Jung Hyun Kim
Original Assignee
Avago Technologies Korea Ltd.
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.)
Filing date
Publication date
Application filed by Avago Technologies Korea Ltd. filed Critical Avago Technologies Korea Ltd.
Priority to CN2004800400475A priority Critical patent/CN1947331B/zh
Priority to DE112004002699T priority patent/DE112004002699B4/de
Priority to JP2007535589A priority patent/JP2008516515A/ja
Publication of WO2006041234A1 publication Critical patent/WO2006041234A1/en

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/45—Differential amplifiers
    • H03F3/45071—Differential amplifiers with semiconductor devices only
    • H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier
    • H03F3/4508—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using bipolar transistors as the active amplifying circuit
    • H03F3/45085—Long tailed pairs
    • 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
    • H03F1/04—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in discharge-tube amplifiers
    • H03F1/06—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in discharge-tube amplifiers to raise the efficiency of amplifying modulated radio frequency waves; to raise the efficiency of amplifiers acting also as modulators
    • H03F1/07—Doherty-type amplifiers
    • 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
    • H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers
    • H03F3/19—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
    • H03F3/191—Tuned amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/60—Amplifiers in which coupling networks have distributed constants, e.g. with waveguide resonators
    • H03F3/602—Combinations of several amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/198—A hybrid coupler being used as coupling circuit between stages of an amplifier circuit
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/541—Transformer coupled at the output of an amplifier
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/543—A transmission line being used as coupling element between two amplifying stages

Definitions

  • the present invention relates to a Doherty amplifier, and more particularly, to an apparatus for compensating for phase of a Doherty amplifier.
  • a Doherty amplifier is one of amplifiers used in a high efficiency modulation method for a high power transmitter and mainly improves efficiency by a combination of a B grade amplifier, a C grade amplifier, and an impedance inverting circuit.
  • FIG. 1 is a block diagram of a conventional Doherty amplifier.
  • the conventional Doherty amplifier includes a 90° phase splitter 110, a carrier amplifier 120, a peak (or peaking) amplifier 130, and a quarter wave transformer 140.
  • the Doherty amplifier adopts a method of connecting the carrier amplifier 120, and the peak amplifier 130 in parallel using the quarter wave transformer 140 ( ⁇ /4 lines).
  • the amount of current output from the peak amplifier 130 as a load varies according to a power level. Accordingly, efficiency is improved by adjusting a load impedance of the carrier amplifier 120.
  • a splitter splits an input signal into two signals so that one signal is input to the carrier amplifier 120 and the other signal is input to the peak amplifier 130.
  • the signal input to the peak amplifier 130 is delayed by 90° so that a delay time difference from the signal input to the carrier amplifier 120 is compensated for.
  • phase equivalent to the actual difference is to be compensated for.
  • the 90° phase splitter 110 is mainly implemented with passive devices and using a 3dB hybrid coupler.
  • the carrier amplifier 120 and the peak amplifier 130 include input matching, a drive end transistor, inter-stage matching, an output end transistor, and output matching network.
  • the 90° phase splitter 110 made of the passive devices requires a large size of the passive devices to be implemented at a lower frequency and i integration thereof is not easy.
  • the present invention provides a Doherty amplifier using an active phase splitter which can compensate for phase with only active devices, and moreover, finely compensate for phase by adding an inductor L and/or a capacitor C.
  • a Doherty amplifier using an active phase splitter in which a carrier amplifier and a peak amplifier are connected in parallel using a quarter wave transformer ( ⁇ /4 line), the Doherty amplifier comprising an active phase splitter, wherein the active phase splitter comprises a buffer amplifier splitting an input signal into a first route and a second route and compensating for a phase difference, a base terminal of the buffer amplifier is connected to an input signal terminal so that an output of a collector terminal of the buffer amplifier forms the first route and an output of an emitter terminal of the buffer amplifier forms the second route, and a signal output from the first route is input to the carrier amplifier and a signal output from the second route is input to the buffer amplifier.
  • the active phase splitter comprises a buffer amplifier splitting an input signal into a first route and a second route and compensating for a phase difference, a base terminal of the buffer amplifier is connected to an input signal terminal so that an output of a collector terminal of the buffer amplifier forms the first route and an output of an emitter terminal of the buffer amplifier forms the second route, and
  • a Doherty amplifier using an active phase splitter in which a carrier amplifier and a peak amplifier are connected in parallel using a quarter wave transformer ( ⁇ /4 line), the Doherty amplifier comprising an active phase splitter, wherein the active phase splitter comprises a first transistor and a second transistor to split an input signal into a first route and a second route and compensate for a phase difference, the first transistor and the second transistor have a differential pair structure, an output of a collector terminal of the first transistor forms the first route and an output of a collector terminal of the second transistor forms the second route, and a signal output from the first route is input to the carrier amplifier and a signal output from the second route is input to the buffer amplifier.
  • the active phase splitter comprises a first transistor and a second transistor to split an input signal into a first route and a second route and compensate for a phase difference
  • the first transistor and the second transistor have a differential pair structure
  • an output of a collector terminal of the first transistor forms the first route
  • an output of a collector terminal of the second transistor
  • a Doherty amplifier using an active phase splitter in which a carrier amplifier and a peak amplifier are connected in parallel using a quarter wave transformer ( ⁇ /4 line), the Doherty amplifier comprising an active phase splitter, wherein the active phase splitter comprises a first transistor and a second transistor to split an input signal into a first route and a second route and compensate for a phase difference and has a structure formed of a base common amplifier in which an input signal terminal is connected to an emitter terminal of the first transistor and an emitter common amplifier in which the input signal terminal is connected to a base terminal of the second transistor, an output of a collector terminal of the first transistor forms the first route and an output of a collector terminal of the second transistor forms the second route, and a signal output from the first route is input to the carrier amplifier and a signal output from the second route is input to the buffer amplifier.
  • the active phase splitter comprises a first transistor and a second transistor to split an input signal into a first route and a second route and compensate for a phase difference and has a structure formed of
  • FIG. 1 is a block diagram of a conventional Doherty amplifier
  • FIG. 2 is a block diagram of a Doherty amplifier using an active phase splitter according to an embodiment of the present invention
  • FIGS. 3A through 3D are circuit diagrams of an active phase splitter according to an embodiment of the present invention.
  • FIGS. 4A through 4D are circuit diagrams of an active phase splitter according to another embodiment of the present invention.
  • FIGS. 5A through 5D are circuit diagrams of an active phase splitter according to yet another embodiment of the present invention.
  • FIG. 2 is a block diagram of a Doherty amplifier using an active phase splitter according to an embodiment of the present invention.
  • the Doherty amplifier using an active phase splitter includes an active phase splitter 210, a carrier amplifier 220, a peak amplifier 230, and a quarter wave transformer 240.
  • the active phase splitter 210 is formed based on a buffer amplifier and an inductor L and/or a capacitor C can be added to perform fine phase compensation or generate a phase difference to a desired degree.
  • the buffer amplifier can be used instead of the first stage of the carrier amplifier 220 and the peak amplifier 230 consisting of two or more amplification stages.
  • the configuration using the buffer amplifier only or the configuration using the buffer amplifier and the L and/or C is a structure in which a high frequency monolithic microwave circuit (MMIC) is possible, and can decrease the size of the amplifier.
  • MMIC monolithic microwave circuit
  • the active phase splitter 210 splits an input signal into two output signals so that an output signal on a first route is input to the carrier amplifier 220 and the other output signal on a second route is input to the peak amplifier 230.
  • the signal input to the peak amplifier 230 is delayed by 90° so that a delay time difference from the signal input to the carrier amplifier 220 is compensated for.
  • the output signal on the first route can be input to the peak amplifier 230 and the output signal on the second route can be input to the carrier amplifier 230.
  • the active phase splitter 210 is designed such that the signal input to the peak amplifier 230 and the signal input to the carrier amplifier 220 have a phase difference of about 90°.
  • FIGS. 3A through 3D are circuit diagrams of an active phase splitter according to an embodiment of the present invention.
  • FIG. 3A shows a circuit having a single device structure for compensating for phase using a transistor Q30 only that is an active device.
  • the output signal on the first route is connected to a contact point 35 of FIG. 2 and input to the carrier amplifier
  • the output signal on the first route can be connected to the contact point 45 and input to the peak amplifier 230 while the output signal on the second route can be connected to the contact point 35 and input to the carrier amplifier 220.
  • FIG. 3B shows a circuit for compensating for phase using the transistor Q30 that is an active device and an inductor L1 and a capacitor C1.
  • the L1 and C1 are each active devices and an inductor L1 and a capacitor C1.
  • C1 are connected to the collector terminal of the transistor Q30 so that finer phase compensation is possible or a phase difference to a desired degree can be generated.
  • FIG. 3C shows a circuit in which an inductor L2 and a capacitor C2 are added to the emitter terminal of the transistor Q30 that is an active device to perform fine phase compensation or generate a phase difference to a desired degree. If necessary, only one of the L2 and C2 is added to compensate for the phase difference.
  • FIG. 3D shows a circuit for compensating for phase using the transistor Q30 that is an active device, the L1 and C1 , and the L2 and C2.
  • the L1 and C1 are connected to the collector terminal of the transistor Q30 and the L2 and C2 are connected to the emitter terminal thereof so that finer phase compensation is possible or a phase difference to a desired degree is generated.
  • each circuit is composed by connecting the inductor and the capacitor to the transistor Q30 that is an active device.
  • one of the inductor and capacitor is basically used. However, both the inductor and capacitor can be used or the inductor and capacitor can be further added.
  • FIGS. 4A through 4D are circuit diagrams of an active phase splitter according to another embodiment of the present invention.
  • FIG. 4A shows a circuit having a differential amplification structure for compensating for phase using a first transistor Q41 and a second transistor Q42.
  • the output signal on the first route is connected to the contact point 35 and input to the carrier amplifier 220 while the output signal on the second route is connected to the contact point 45 and input to the peak amplifier 230.
  • the output signal on the first route can be connected to the contact point 45 and input to the peak amplifier 230 while the output signal on the second route can be connected to the contact point 35 and input to the carrier amplifier 220.
  • FIG. 4B shows a circuit in which an inductor L1 and a capacitor C1 are connected to the collector terminal of the first transistor Q41 only so that finer phase compensation is performed or a phase difference to a desired degree is generated.
  • FIG. 4C shows a circuit in which an inductor L2 and a capacitor C2 are connected to the collector terminal of the second transistor Q42 only so that finer phase compensation is performed or a phase difference to a desired degree is generated.
  • FIG. 4D shows a circuit in which the L1 and C1 are connected to the collector terminal of the first transistor Q41 and the L2 and C2 are connected to the collector terminal of the second transistor Q42 so that finer phase compensation is performed or a phase difference to a desired degree is generated.
  • the L1 and C1 connected to the collector terminal of the first transistor Q41 are connected to the contact point 35 in series while the L2 and C2 connected to the emitter terminal of the second transistor Q42 are connected to the contact point 45 in series.
  • the phase difference of 90° between the signals input to the carrier amplifier 220 and the peak amplifier 230 is generated.
  • each circuit is composed by connecting the inductor and the capacitor to the transistors Q41 and/or Q42 that are active devices.
  • one of the inductor and capacitor is basically used. However, both the inductor and capacitor can be used or the inductor and capacitor can be further added.
  • FIGS. 5A through 5D are circuit diagrams of an active phase splitter according to yet another embodiment of the present invention.
  • FIG. 5A shows a circuit having a common base CB/common emitter CE structure, in which an output signal on a first route of a base common amplifier, to which an input signal terminal 10 and an emitter terminal of a first transistor Q51 are connected, is connected to the contact point 35 and input to the carrier amplifier 220.
  • An output signal on a second route of an emitter common amplifier, to which the input signal terminal 10 and a base terminal of a second transistor Q52 are connected, is connected to the contact point 45 and input to the peak amplifier 220.
  • the circuit can be designed such that the output signal on the first route is connected to the contact point 45 and input to the peak amplifier 230 and the output signal on the second route is connected to the contact point 35 and input to the carrier amplifier 220.
  • an inductor L1 and/or a capacitor C1 can be connected only between the input signal terminal 10 and the emitter terminal of the first transistor Q51.
  • an inductor L2 and/or a capacitor C2 can be connected only between the input signal terminal 10 and the base terminal of the second transistor Q52.
  • FIG. 5D shows a circuit in which the L1 and/or C1 are connected between the input signal terminal 10 and the emitter terminal of the first transistor Q51 and the L2 and/or C2 are connected between the input signal terminal 10 and the base terminal of the second transistor Q52, so that finer phase difference is generated or a phase difference is generated as much as a circuit designer desires.
  • the L1 and/or C1 are connected in series between the input signal terminal 10 and the emitter terminal of the first transistor Q51 and to the contact point 35, and the L2 and/or C2 are connected in series between the input signal terminal 10 and the base terminal of the second transistor Q52 and to the contact point 45.
  • the phase difference of 90° between the signals input to the carrier amplifier 220 and the peak amplifier 230 is generated.
  • each circuit is composed by connecting the inductor and the capacitor to the transistors Q51 and/or Q52 that are active devices.
  • one of the inductor and capacitor is basically used. However, both the inductor and capacitor can be used or the inductor and capacitor can be further added.
  • phase compensation circuit since a phase compensation circuit is made using an active device, the size taken by the phase compensation circuit is reduced much so that the phase compensation circuit can be integrated in a high frequency monolithic microwave circuit (MMIC). Also, since the active device constituting the phase compensation circuit can replace the first stage of the carrier amplifier and the peak amplifier, the carrier amplifier and the peak amplifier can be easily designed.
  • MMIC monolithic microwave circuit

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
  • Microwave Amplifiers (AREA)
PCT/KR2004/003146 2004-10-11 2004-12-02 Doherty amplifier using active phase splitter WO2006041234A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN2004800400475A CN1947331B (zh) 2004-10-11 2004-12-02 使用有源分相器的多赫蒂放大器
DE112004002699T DE112004002699B4 (de) 2004-10-11 2004-12-02 Doherty-Verstärker unter Verwendung eines aktiven Phasenteilers
JP2007535589A JP2008516515A (ja) 2004-10-11 2004-12-02 能動分相器を用いたドハティ増幅器

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2004-0080841 2004-10-11
KR1020040080841A KR20060032270A (ko) 2004-10-11 2004-10-11 능동 위상 보상기를 이용한 도허티 증폭기

Publications (1)

Publication Number Publication Date
WO2006041234A1 true WO2006041234A1 (en) 2006-04-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2004/003146 WO2006041234A1 (en) 2004-10-11 2004-12-02 Doherty amplifier using active phase splitter

Country Status (5)

Country Link
JP (1) JP2008516515A (ja)
KR (1) KR20060032270A (ja)
CN (1) CN1947331B (ja)
DE (1) DE112004002699B4 (ja)
WO (1) WO2006041234A1 (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10911003B2 (en) 2017-01-24 2021-02-02 Mitsubishi Electric Corporation Doherty amplifier
US11705870B2 (en) 2020-07-17 2023-07-18 Nxp Usa, Inc. Integrally-formed splitter for multiple-path power amplifiers and methods of manufacture thereof

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JP6235395B2 (ja) * 2014-03-28 2017-11-22 日本電信電話株式会社 エミッタフォロア回路
CN104009721A (zh) * 2014-06-16 2014-08-27 东南大学苏州研究院 一种线性度和效率提高的推挽式功率放大器
KR101643287B1 (ko) 2014-12-26 2016-07-29 가천대학교 산학협력단 클래스 f가 적용된 비대칭 도허티 증폭기
US9899961B2 (en) 2015-02-15 2018-02-20 Skyworks Solutions, Inc. Enhanced amplifier efficiency through cascode current steering
JP2018137566A (ja) * 2017-02-21 2018-08-30 株式会社村田製作所 電力増幅回路

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
US10911003B2 (en) 2017-01-24 2021-02-02 Mitsubishi Electric Corporation Doherty amplifier
US11705870B2 (en) 2020-07-17 2023-07-18 Nxp Usa, Inc. Integrally-formed splitter for multiple-path power amplifiers and methods of manufacture thereof

Also Published As

Publication number Publication date
DE112004002699B4 (de) 2010-01-21
CN1947331B (zh) 2010-12-08
CN1947331A (zh) 2007-04-11
JP2008516515A (ja) 2008-05-15
DE112004002699T5 (de) 2007-01-18
KR20060032270A (ko) 2006-04-17

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