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WO2019026669A1 - Dispositif sans fil et procédé d'amplification de sortie sans fil - Google Patents

Dispositif sans fil et procédé d'amplification de sortie sans fil Download PDF

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Publication number
WO2019026669A1
WO2019026669A1 PCT/JP2018/027502 JP2018027502W WO2019026669A1 WO 2019026669 A1 WO2019026669 A1 WO 2019026669A1 JP 2018027502 W JP2018027502 W JP 2018027502W WO 2019026669 A1 WO2019026669 A1 WO 2019026669A1
Authority
WO
WIPO (PCT)
Prior art keywords
voltage
unit
amplifier
wireless device
main amplifier
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2018/027502
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English (en)
Japanese (ja)
Inventor
堂坂　淳也
石神　武
暢人 渡口
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kokusai Denki Electric Inc
Original Assignee
Hitachi Kokusai Electric Inc
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 Hitachi Kokusai Electric Inc filed Critical Hitachi Kokusai Electric Inc
Priority to JP2019534046A priority Critical patent/JP6836650B2/ja
Publication of WO2019026669A1 publication Critical patent/WO2019026669A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • H03F3/24—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages

Definitions

  • the present invention relates to a technique of controlling a voltage supplied to a main amplifier for amplifying a wireless output by an ET method.
  • quadrature modulation can be roughly classified into analog modulation or digital modulation.
  • the analog method can be realized at relatively low cost, has an affinity for distortion compensation technology of baseband feedback such as Cartesian, and has an advantage that it can be directly converted to a desired frequency.
  • baseband feedback such as Cartesian
  • the digital system since they are digital and orthogonal, there is an advantage that adjustment of amplitude balance, orthogonality and DC is unnecessary.
  • it is difficult to adopt direct conversion in a digital system because a high-speed DAC (Digital Analog Converter) is required and the cost is high.
  • Digital Analog Converter Digital Analog Converter
  • FIG. 1 shows a schematic configuration of a radio unit and an amplifier power supply unit in a conventional radio.
  • the amplifier power supply unit includes a DC power supply unit 130, an ET output unit 140, and a control unit 150, and supplies power to the main amplifier 110 constituting the wireless unit.
  • the wireless unit includes a control unit 150, DACs 121 and 122, an analog quadrature modulation unit 123, and a main amplifier (PA: Power Amplifier) 110.
  • PA Power Amplifier
  • the control unit 150 includes an FPGA (Field Programmable Gate Array) 151 and a DSP (Digital Signal Processor) 152, and acquires an IQ signal.
  • the control unit 150 When the control unit 150 functions as part of the wireless unit, the control unit 150 outputs the I signal and the Q signal to the DACs 121 and 122, respectively. Further, when functioning as part of the amplifier power supply unit, the control unit 150 controls the ET output unit 140 to control the supply voltage to the main amplifier 110. For example, the control unit 150 calculates an envelope from the IQ signal by so-called power calculation, and outputs the calculation result to the ET output unit 140.
  • the DACs 121 and 122 perform analog conversion on the I signal and the Q signal, and output the analog signal to the analog quadrature modulator 123.
  • the signal modulated by the analog quadrature modulator 123 is amplified by the main amplifier 110 and transmitted from the antenna. Also, the output of the main amplifier 110 is fed back to the analog quadrature modulator 123 to form a predetermined cartesian feedback.
  • the Lo signal of the analog quadrature modulation unit 123 variable, it is possible to cope with various frequencies.
  • the ET output unit 140 includes a PWM (Pulse Width Modulation) unit 141, a class D amplifier 145, and a filter 146.
  • the PWM unit 141 includes a DAC 142, a triangular wave generation circuit 143, and a comparator 144.
  • the DAC 142 converts the calculation result of the envelope acquired from the control unit 150 into an analog signal, and outputs the analog signal to the comparator 144.
  • the comparator 144 generates a PWM signal for ET from the analog waveform of the envelope output from the DAC 142 and the triangular wave (switching waveform) output from the triangular wave generation circuit 143.
  • the PWM signal for ET is amplified by the class D amplifier 145 based on the DC voltage from the DC power supply unit 130, returned to the original analog waveform (envelope) by the filter 146, and supplied to the main amplifier 110 as the ET voltage. .
  • a filter is required at the stage subsequent to the class D amplifier in the ET output unit in order to return the PWM signal to the original analog waveform (envelope).
  • ET voltage is often used for the main amplifier of the final stage in amplification
  • the switching frequency is superimposed on the amplification element as it is depending on the characteristics of the filter, and there is a problem that spurious results appear as amplification results (see FIG. 6A). is there.
  • the present invention has been made in view of the above-described conventional circumstances, and proposes an effective technique for miniaturizing a filter of an ET output unit in a wireless device that amplifies a wireless output by the ET method. With the goal.
  • a first aspect of the present invention is a radio apparatus comprising: a main amplifier for amplifying a signal to be transmitted by radio; and an ET output unit for outputting an ET voltage following the envelope of the signal and supplying the ET voltage to the main amplifier.
  • the ET output unit operates based on a switching waveform of a predetermined frequency, and a distribution unit for distributing the ET voltage to the amplifier at the front stage of the main amplifier, and a predetermined frequency for the ET voltage distributed by the distribution unit
  • a reverse phase conversion unit for converting the component of the negative phase into a reverse phase, and the ET voltage converted by the reverse phase conversion unit is supplied to the amplifier at the previous stage.
  • the ET voltage output from the ET output section includes a component of the switching frequency
  • the ET voltage in which the component is in reverse phase is supplied to the amplifier at the front stage of the main amplifier, Generation of spurious at the output of the main amplifier can be suppressed. Therefore, even if the filter provided in the ET output unit is miniaturized, the generation of the spurious is suppressed, so that the miniaturization and cost reduction of the wireless device can be realized.
  • an AC coupling unit may be provided to AC couple the ET voltage converted by the negative phase conversion unit to the AC voltage.
  • the ET voltage after conversion by the negative phase conversion unit may be supplied to one or more of the plurality of amplifiers.
  • a second aspect of the present invention is a radio apparatus comprising: a main amplifier for amplifying a signal to be transmitted by radio; and an ET output unit for outputting an ET voltage corresponding to the envelope of the signal and supplying the ET voltage to the main amplifier.
  • the ET output unit is operated based on a switching waveform of a predetermined frequency, and includes an inverse waveform generation unit that generates an opposite phase waveform corresponding to a component of the predetermined frequency assumed to be included in the ET voltage. And a waveform generated by the reverse waveform generation unit is superimposed on the ET voltage.
  • the ET voltage output from the ET output section includes a component of the switching frequency
  • the waveform of the phase opposite to that is superimposed on the ET voltage to cancel the component of the switching waveform.
  • Generation of spurious at the output of the main amplifier can be suppressed. Therefore, even if the filter provided in the ET output unit is miniaturized, the generation of the spurious is suppressed, so that the miniaturization and cost reduction of the wireless device can be realized.
  • the present invention it is possible to miniaturize the filter of the ET output unit in the wireless device which amplifies the wireless output by the ET method.
  • the filters (223, 323, and 42) used in the amplifier power supply units according to the following first to third embodiments are miniaturized as compared with those of the conventional system.
  • the miniaturization of the filter is realized by miniaturizing the coil (L) and capacitor (C) which are components constituting the filter, and reducing and simplifying the number of these components. be able to.
  • FIG. 2 shows an example of the configuration of the amplifier power supply unit according to the first embodiment of the present invention.
  • the amplifier power supply unit of this example includes a DSP 201, an FPGA 202, an ET output unit 220 having a PWM unit 221, a class D amplifier 222, and a filter 223, and a DC power supply unit 211, PA) Power is supplied to 251.
  • the DSP 201 calculates an envelope from the IQ signal by so-called power calculation.
  • the FPGA 151 receives the calculation result of the envelope and sets it in the PWM unit 221.
  • the PWM unit 221 converts the calculation result of the envelope into an analog signal by the DAC, and generates a PWM signal for ET using a switching waveform of a predetermined frequency (for example, a triangular wave of 1 MHz).
  • the PWM signal output from the PWM unit 221 is amplified by the class D amplifier 222 based on the DC voltage from the DC power supply unit 211, is returned to the original analog waveform (envelope) by the filter 223, and is used as an ET voltage as the main amplifier 253. Supplied to
  • the main feature of the wireless output amplification unit according to the first embodiment is that the ET voltage output from the ET output unit is distributed to another amplifier preceding the main amplifier.
  • another amplifier preceding the main amplifier operates at a DC voltage in the same manner as the main amplifier.
  • two amplifiers (AMP) 252 and 253 are provided before the main amplifier 251, and a distribution unit 231 for distributing the ET voltage to the amplifier 253 among them is provided.
  • a reverse phase conversion unit 232 is provided in order to convert the component of the switching frequency to the reverse phase and supply it to the amplifier 253.
  • the reverse phase conversion unit 232 generates a reverse phase waveform by using a comparator for the signal distributed from the distributor 231. Then, since the reverse phase waveform generated by the reverse phase conversion unit 232 is supplied to the amplifier 253, the reverse phase component of the spurious component is amplified by the amplifier 253. Since the signal is amplified by the main amplifier 251 based on the ET voltage input from the divider 231, the generation of the spurious is suppressed by the amplification in the main amplifier 251.
  • the radio apparatus includes the main amplifier 251 for amplifying a signal to be transmitted wirelessly, and the ET output unit 220 for outputting the ET voltage for following the envelope of the signal and supplying the ET voltage to the main amplifier 251.
  • the ET output unit 220 operates based on a switching waveform of a predetermined frequency.
  • the radio apparatus according to the first embodiment further divides the component of the switching frequency into the reverse phase to the ET voltage distributed by the distributing unit 231 and the distributing unit 231 for distributing the ET voltage to the amplifier 253 at the front stage of the main amplifier 251.
  • a reverse phase conversion unit 232 which performs conversion, and supplies the ET voltage after conversion by the reverse phase conversion unit 232 to the amplifier 253 of the previous stage.
  • the switching frequency component remains in the ET voltage due to the miniaturization of the filter
  • the switching frequency component is reverse phase to be supplied to the preceding amplifier of the main amplifier, so amplification by the main amplifier
  • An input signal having a component that cancels out the generated spurious can be generated by the preceding amplifier and applied to the main amplifier.
  • the ET voltage includes a component of the switching frequency, as shown in FIG. 6B
  • the ET voltage is distributed to the amplifier 253 immediately before the main amplifier 251 among the two amplifiers 252 and 253 preceding the main amplifier 251.
  • the ET voltage may be distributed to the previous amplifier).
  • FIG. 3 shows a configuration example of an amplifier power supply unit according to a second embodiment of the present invention.
  • the amplifier to which the ET voltage is distributed operates in the same manner as the main amplifier at the DC voltage.
  • the amplifier to which the ET voltage is distributed operates at the AC voltage. The case will be described.
  • the main feature of the wireless output amplifier according to the second embodiment is that the ET voltage output from the ET output unit is AC coupled to an AC voltage for operating another amplifier preceding the main amplifier.
  • the ET voltage output from the ET output unit is AC coupled to an AC voltage for operating another amplifier preceding the main amplifier.
  • the distribution unit 231 is provided.
  • a reverse phase conversion unit 232 is provided for converting the component of the switching frequency into a reverse phase, and the ET voltage after conversion by the reverse phase conversion unit 232 is supplied to the amplifier 254.
  • An AC coupling 233 is provided which is AC coupled to the supply voltage.
  • the arrangement and the number of amplifiers to which the ET voltage is to be distributed are arbitrary, as long as an effect of removing or reducing the spurious can be obtained.
  • FIG. 4 shows an example of the configuration of an amplifier power supply unit according to a third embodiment of the present invention.
  • the main feature of the wireless output amplifier according to the third embodiment is to generate a waveform that cancels the component of the switching frequency in the ET voltage and to superimpose it on the ET voltage.
  • the reverse waveform generation unit 234 is provided which generates a waveform to be superimposed on the ET voltage.
  • the reverse waveform generation unit 234 generates a waveform in reverse phase corresponding to the component of the switching frequency assumed to be included in the ET voltage based on the control of the FPGA 202.
  • the waveform generated by the inverse waveform generation unit 234 is superimposed on the ET voltage output from the ET output unit 220.
  • the reverse waveform generation unit 234 is, for example, a DAC, and converts the signal input from the FPGA 202 into an analog signal to generate an analog signal of reverse phase waveform. Since the FPGA 202 controls the PWM unit 221, it can generate switching noise and its reverse phase voltage, which is input to the reverse waveform generator 234 to generate a waveform of the reverse phase.
  • the radio apparatus includes the main amplifier 251 for amplifying a signal to be wirelessly transmitted, and the ET output unit 220 for outputting the ET voltage for following the envelope of the signal and supplying the ET voltage to the main amplifier 251.
  • the ET output unit 220 operates based on a switching waveform of a predetermined frequency.
  • the radio apparatus according to the third embodiment further includes an inverse waveform generation unit 234 that generates an inverse phase waveform corresponding to the component of the switching frequency assumed to be included in the ET voltage, and the generation is performed by the inverse waveform generation unit 234 The waveform is superimposed on the ET voltage.
  • the third embodiment even if the ET voltage includes the component of the switching frequency, the component of the switching frequency can be removed or reduced from the ET voltage and supplied to the main amplifier, and the amplification result in the main amplifier It is possible to eliminate or reduce the spurious. Therefore, the generation of spurious can be suppressed even if the filter provided in the ET output unit is miniaturized, so that the miniaturization and cost reduction of the wireless device can be realized.
  • the third embodiment can also be applied in combination with the first embodiment (or the second embodiment). That is, the reverse waveform generation unit 234 of FIG. 4 may be added to the configuration of FIG. 2 (or FIG. 3).
  • the configuration of the system or apparatus according to the present invention is not necessarily limited to those described above, and various configurations may be used.
  • the present invention can be applied to the hardware architecture of the multi-band radio unit in software radio because it can cope with various frequencies by varying the Lo signal of the analog orthogonal unit due to the configuration of the radio.
  • it can be applied as a radio unit hardware architecture of white space (secondary use), which has recently been attracting attention.
  • the present invention can also be provided, for example, as a method or method for executing the processing according to the present invention.
  • the present invention can be used for various types of radios in which the voltage supplied to the main amplifier is controlled by the ET method.

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

Abstract

Le problème décrit par la présente invention est une technique efficace pour fabriquer un filtre d'une unité de sortie ET plus petite dans un dispositif sans fil pour amplifier une sortie sans fil à l'aide d'un système ET. La solution selon l'invention porte sur un dispositif sans fil, comprenant : un amplificateur primaire 251 pour amplifier des signaux transmis sans fil; et une unité de sortie ET 220 pour délivrer une tension ET qui se conforme à une enveloppe desdits signaux, et fournir la tension ET à l'amplificateur primaire 251. L'unité de sortie ET 220 fonctionne sur la base d'une forme d'onde de commutation d'une fréquence prédéterminée. Le dispositif sans fil comprend en outre : une unité de distribution 231 pour distribuer la tension ET à un amplificateur de premier étage 253 de l'amplificateur primaire 251; et une unité de conversion de phase inverse 232 destinée à convertir le composant de la fréquence de commutation en phase inverse dans la tension ET distribuée par l'unité de distribution 231, la tension ET après conversion par l'unité de conversion de phase inverse 232 étant fournie à l'amplificateur de premier étage 253.
PCT/JP2018/027502 2017-08-04 2018-07-23 Dispositif sans fil et procédé d'amplification de sortie sans fil Ceased WO2019026669A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2019534046A JP6836650B2 (ja) 2017-08-04 2018-07-23 無線機及び無線出力増幅方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017-151186 2017-08-04
JP2017151186 2017-08-04

Publications (1)

Publication Number Publication Date
WO2019026669A1 true WO2019026669A1 (fr) 2019-02-07

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PCT/JP2018/027502 Ceased WO2019026669A1 (fr) 2017-08-04 2018-07-23 Dispositif sans fil et procédé d'amplification de sortie sans fil

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JP (1) JP6836650B2 (fr)
WO (1) WO2019026669A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006093872A (ja) * 2004-09-21 2006-04-06 Matsushita Electric Ind Co Ltd Ｅｅｒ変調増幅装置
WO2009101905A1 (fr) * 2008-02-14 2009-08-20 Nec Corporation Amplificateur de puissance
JP2011249892A (ja) * 2010-05-24 2011-12-08 Mitsubishi Electric Corp バイアス制御増幅器
WO2016130780A1 (fr) * 2015-02-11 2016-08-18 Snaptrack, Incorporated Réduction d'impédance de sortie d'amplificateur à courant alternatif

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5003134B2 (ja) * 2006-01-10 2012-08-15 日本電気株式会社 増幅装置
JP5109980B2 (ja) * 2006-12-26 2012-12-26 日本電気株式会社 電力増幅器

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006093872A (ja) * 2004-09-21 2006-04-06 Matsushita Electric Ind Co Ltd Ｅｅｒ変調増幅装置
WO2009101905A1 (fr) * 2008-02-14 2009-08-20 Nec Corporation Amplificateur de puissance
JP2011249892A (ja) * 2010-05-24 2011-12-08 Mitsubishi Electric Corp バイアス制御増幅器
WO2016130780A1 (fr) * 2015-02-11 2016-08-18 Snaptrack, Incorporated Réduction d'impédance de sortie d'amplificateur à courant alternatif

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Publication number Publication date
JP6836650B2 (ja) 2021-03-03
JPWO2019026669A1 (ja) 2020-06-18

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