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WO2008012883A1 - Périphérique de communication sans fil - Google Patents

Périphérique de communication sans fil Download PDF

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Publication number
WO2008012883A1
WO2008012883A1 PCT/JP2006/314803 JP2006314803W WO2008012883A1 WO 2008012883 A1 WO2008012883 A1 WO 2008012883A1 JP 2006314803 W JP2006314803 W JP 2006314803W WO 2008012883 A1 WO2008012883 A1 WO 2008012883A1
Authority
WO
WIPO (PCT)
Prior art keywords
power supply
supply voltage
power
path
amplifier
Prior art date
Application number
PCT/JP2006/314803
Other languages
English (en)
Japanese (ja)
Inventor
Katsuhiro Sakai
Shinji Ueda
Takashi Enoki
Original Assignee
Panasonic Corporation
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 Panasonic Corporation filed Critical Panasonic Corporation
Priority to PCT/JP2006/314803 priority Critical patent/WO2008012883A1/fr
Publication of WO2008012883A1 publication Critical patent/WO2008012883A1/fr

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Classifications

    • 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
    • H03F3/20—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
    • H03F3/245—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages with semiconductor devices only

Definitions

  • the present invention relates to a wireless communication apparatus including a Doherty amplifier using a battery as a power source.
  • FIG. 1 is a schematic configuration diagram of a commonly known Dono / Tee amplifier.
  • the Doherty amplifier includes two amplifiers, a carrier amplifier 1 and a peak amplifier 2, and a ⁇ 4 transmission line A, ⁇ , and C force.
  • the characteristic impedance of ⁇ ⁇ 4 transmission line ⁇ is Z
  • the characteristic impedance of ⁇ Z4 transmission line B is Z
  • the characteristic impedance of transmission line C is ⁇ . Of the two amplifiers, only the carrier amplifier 1 operates in the low power region and the carrier amplifier 1 and the peak amplifier 2 operate in the high power region. ) Is bias controlled by a bias circuit (not shown).
  • FIG. 2 is an equivalent circuit when the Dono and tee amplifier shown in FIG. 1 operates in the low power region
  • FIG. 3 shows the Dono and tee amplifier shown in FIG. 1 in the high power region.
  • This is an equivalent circuit.
  • the equivalent circuit diagrams in Figs. 2 and 3 connect impedance ⁇ as load 3.
  • the output power is a predetermined level.
  • the impedance when looking at the load 3 side is 2Z.
  • the impedance when looking at the 3 side is also Z.
  • the load impedance of the carrier amplifier 1 is 2Z during low power operation.
  • the impedance of the carrier amplifier 1 viewed from the load 3 side is high impedance, and when operating at high power, the impedance of the carrier amplifier 1 viewed from the load 3 side is low impedance. Therefore, when the load impedance is 2Z (that is, low power
  • the carrier amplifier 1 is designed so that the saturation power is reduced but the efficiency is high, and the saturation power is increased when the load impedance is Z (that is, during high power operation).
  • the Dono and Tee amplifiers can realize highly efficient power amplification over a wide dynamic range.
  • Patent Document 1 Special Table 2001-520828
  • Patent Document 2 JP 2001-518731
  • the power source mounted on the portable terminal or the like is generally a secondary battery such as a lithium ion battery
  • the electromotive force decreases with time. Therefore, if the usage time of the portable terminal becomes longer, the power supply voltage of the Dono / Tee amplifier built into the portable terminal will decrease, and as a result, the distortion characteristics of the Dono / Tee amplifier will deteriorate. The linearity of the output power will deteriorate. In other words, even if high-efficiency power amplification is obtained over a wide dynamic range by the Doherty amplifier, distortion is degraded due to a decrease in the power supply voltage caused by the secondary battery, and output power with good linearity cannot be obtained. End up.
  • the present invention has been made in view of such circumstances, and provides a wireless communication apparatus including a Doherty amplifier that can prevent distortion deterioration due to a decrease in power supply voltage with a simple circuit configuration. Objective.
  • FIG. 1 Schematic configuration diagram of commonly known Dono and Tee amplifiers
  • FIG. 5 is a basic circuit diagram of a radio communication apparatus according to Embodiment 1 of the present invention.
  • FIG. 6 is a basic circuit diagram of a radio communication apparatus according to Embodiment 2 of the present invention.
  • FIG. 7 is a basic circuit diagram of a radio communication apparatus according to Embodiment 3 of the present invention.
  • FIG. 8 is a basic circuit diagram of a radio communication apparatus according to Embodiment 4 of the present invention.
  • the Dono and Tee amplifiers applied to the wireless communication apparatus of the present invention pay attention to the fact that the distortion deteriorates when the power supply voltage of the carrier amplifier decreases almost without being affected by the decrease of the power supply voltage of the peak amplifier.
  • a constant power supply means for keeping the power supply voltage of only the carrier amplifier constant. This makes it high over a wide dynamic range.
  • Dono and Tee amplifiers applied to the wireless communication apparatus of the present invention will be described in detail. Note that in the drawings used in the following embodiments, the same components are denoted by the same reference numerals, and redundant description will be omitted as much as possible.
  • the inventors have found from experimental results that, in the carrier amplifier and the peak amplifier constituting the Doherty amplifier, the distortion of the Dono and Tee amplifiers deteriorates when the power supply voltage of the carrier amplifier decreases.
  • the distortion characteristics of the Doherty amplifier depend on the power supply voltage of the carrier amplifier.
  • FIG. 4 is a characteristic diagram showing the relationship of distortion degradation due to a drop in power supply voltage in the Doherty amplifier, where the horizontal axis shows output power and the vertical axis shows distortion.
  • the distortion characteristics of the Donoty amplifier (a) the Doherty amplifier gradually increases in distortion as the output power increases, and exceeds a predetermined output power. The distortion suddenly increases.
  • the distortion characteristic (b) shown by the broken line when the power supply voltage of only the peak amplifier is lowered is almost the same as the distortion characteristic (a) of the Dono and Tee amplifiers.
  • the distortion characteristics when the power supply voltage of the carrier amplifier alone is lowered are greatly deteriorated.
  • the distortion characteristic (c) when the power supply voltage of only the carrier amplifier is lowered the distortion increases rapidly even when the output power is relatively small.
  • the distortion characteristics when the power supply voltage of both the peak amplifier and the carrier amplifier are lowered are shown by the broken line (d). It is almost the same as (c).
  • the distortion characteristics of the carrier amplifier are almost equal to the distortion characteristics of the Doherty amplifier.
  • the distortion of the Doherty amplifier is greatly deteriorated.
  • the Dono / Tee amplifier since the power source mounted on the mobile terminal is generally a secondary battery such as a lithium ion battery, the power supply voltage of the carrier amplifier decreases as the usage time of the mobile terminal increases. As a result, distortion of the Doherty amplifier deteriorates and the linearity of the output power deteriorates. Therefore, the Dono / Tee amplifier according to the first embodiment of the present invention is provided with constant power supply voltage supply means for making the power supply voltage of only the carrier amplifier constant.
  • FIG. 5 is a basic circuit diagram of the radio communication apparatus according to Embodiment 1 of the present invention.
  • the Doherty amplifier 101 applied to the radio communication apparatus of the present invention has a configuration in which a carrier amplifier 102 and a peak amplifier 103 are connected in parallel, and the carrier amplifier 102 includes a first amplifier Power is supplied from the battery 104 via the constant power supply voltage supply means 106, and the peak amplifier 103 is configured to be supplied with power directly from the second battery 105.
  • the first battery 104 and the second battery 105 may be the same battery.
  • the carrier amplifier 102, the peak amplifier 103, and the ⁇ 4 transmission line inserted into the output circuit are omitted.
  • the constant power supply voltage supply means 106 has a function of supplying a power supply voltage of a constant voltage to the carrier amplifier 102, and the circuit is integrated to make it one chip or high. It can be realized by a DC-DC converter with a bridge configuration and SiP (System in Package). Such DC-DC converters are widely put into practical use by circuit configurations such as switching regulators and ringing choke converters (RCC).
  • the DC-DC converter used as the constant power supply voltage supply means 106 can output a constant voltage even when the battery voltage of the first battery 104 drops, whether it is a step-up DC-DC converter or a step-down DC-DC converter. Any constant voltage power supply may be used.
  • the Doherty amplifier 101 can maintain high-efficiency power amplification and low distortion characteristics over a wide dynamic range.
  • the Doherty amplifier 101 when the output power supplied to the load 110 is in the low power mode lower than the predetermined value, only the carrier amplifier 102 performs the amplification operation, and when the output power is in the high power mode higher than the predetermined value.
  • the carrier amplifier 102 and the peak amplifier 103 perform the amplification operation, so that the low power mode power and the high efficiency power amplification are performed over a wide dynamic range up to the high power mode.
  • the Dono-Tee amplifier 101 is continuously used, the power of reducing the voltage of the first battery 104 and the second battery 105 is reduced even if the voltage of the first battery 104 is reduced. Constant power supply voltage A constant voltage is always supplied to the carrier amplifier 102 by the constant voltage action of the supply means 106. On the other hand, when the voltage of the second battery 105 decreases, a voltage in a state where the battery voltage is decreased is supplied to the peak amplifier 103.
  • the power supply voltage of the carrier amplifier 102 is held at a constant voltage, even if the power supply voltage of the peak amplifier 103 decreases, the Dono / Tee amplifier 101 has a low distortion level. Can be maintained. In other words, the Dono-Tee amplifier 101 can continue to operate while maintaining good linearity with high efficiency and low distortion over a wide dynamic range even when the battery voltage drops.
  • the Doherty amplifier 101 does not allow the carrier amplifier 102 and the peak amplifier 103 to operate in a balanced configuration as a class AB amplifier! /, So the constant power supply voltage supply means 106 is replaced with a carrier amplifier. If only 102 is provided, it is possible to prevent distortion deterioration, so that the rated level of the constant power supply voltage supply means 106 can be reduced. Therefore, it is possible to lower the rating of circuit elements that are constituent elements of a DC-DC converter and reduce the circuit scale, so that it is also possible to reduce the cost of wireless communication devices.
  • the DC-DC converter since the DC-DC converter only needs to supply power to one of the amplifiers (that is, the carrier amplifier 102), the load current of the DC-DC converter can be reduced. As a result, the battery (That is, the lifetime of the first battery 104) can be extended. In other words, it is possible to extend the life of the battery used in the wireless communication device, and as a result, it is possible to further reduce the size of the wireless communication device by reducing the size of the battery.
  • the power supply voltage supply path switching unit 108 supplies power from the first battery 104 to the carrier amplifier 102 depending on whether the voltage of the first battery 104 is in the normal range or decreases. Are switched to a first path that bypasses constant power supply means 106 and a second path that passes constant power supply means 106.
  • the power supply voltage drop detection means 107 is a means for detecting a voltage drop of the first battery 104, and can be realized by, for example, a DC voltage detection sensor. Further, the power supply voltage supply path switching means 108 is used when the power supply voltage drop detecting means 107 does not detect a voltage drop of the first battery 104 (that is, when the voltage of the first battery 104 is in a normal range).
  • the path is switched so that the path of the first battery 104 becomes the first path bypassing the constant power supply voltage supply means 106, and the power supply voltage drop detection means 107 detects the voltage drop of the first battery 104 (That is, when the voltage of the first battery 104 drops below a predetermined level), the path of the first battery 104 becomes a second path that passes through the constant power supply voltage supply means 106. Perform path switching.
  • a power supply voltage supply path switching means 108 can be realized by, for example, a semiconductor switch that is turned ON / OFF by a signal from the power supply voltage drop detection means 107.
  • the constant power supply voltage supply means 106 is always used. However, in the wireless communication device of the second embodiment shown in FIG. Whether or not the constant power supply voltage supply means 106 is used is determined depending on whether or not a voltage drop of the battery 104 is detected. That is, depending on whether or not the voltage of the first battery 104 is lower than a predetermined voltage threshold, Whether to use the power supply voltage supply means 106 is determined.
  • the power supply voltage drop detection means 107 does not send a battery voltage drop signal to the power supply voltage supply path switching means 108.
  • the path switching means 108 supplies the power to the carrier amplifier 102 by bypassing the constant power supply voltage supply means 106 with the path of the first battery 104 as the first path.
  • the power supply voltage drop detection means 107 transmits a battery voltage drop signal to the power supply voltage supply path switching means 108. Then, the power supply voltage supply path switching means 108 switches the path of the first battery 104 to the second path and supplies power to the carrier amplifier 102 using the constant power supply voltage supply means 106. As a result, even when the voltage of the first battery 104 falls below the voltage threshold, a constant voltage power source can be supplied to the carrier amplifier 102.
  • FIG. 7 is a basic circuit diagram of a radio communication apparatus according to Embodiment 3 of the present invention.
  • the wireless communication device of the third embodiment shown in FIG. 7 is different from the wireless communication device of the first embodiment shown in FIG. 5 in that an RF input level detection means 109 and a power supply voltage supply path switching means 108 are added. Is a point.
  • the RF input level detection means 109 has a function of detecting whether or not the power level of the RF input signal is higher than the power threshold.
  • the power supply voltage supply path switching means 108 connects the first battery 104 to the carrier amplifier 102 by bypassing the constant power supply voltage supply means 106 based on the detection result of the RF input level detection means 109. 1 has a function of switching between a first path and a second path that connects the first battery 104 to the carrier amplifier 102 through the constant power supply voltage supply means 106.
  • the power supply voltage supply path switching means 108 is a constant power supply voltage supply means for supplying power from the first battery 104 to the carrier amplifier 102 depending on whether the power level of the RF input signal is low or high.
  • the first path that bypasses 106 and the second path that passes the constant power supply voltage supply means 106 are switched. That is, the power supply voltage supply path switching unit 108 determines whether or not to use the constant power supply voltage supply means 106 according to the power level of the RF input signal.
  • the power supply voltage supply path switching means 108 is not connected to the first battery 104.
  • the power supply is supplied to the carrier amplifier 102 by bypassing the constant power supply means 106 by using the first path as a first path. This is because when the power level of the RF input signal is low, the distortion of the RF input signal is small, so even if the voltage supplied to the carrier amplifier 102 decreases, there is almost no distortion degradation of the Doherty amplifier 101. This means that the voltage of the first battery 104 may be supplied to the carrier amplifier 102 by bypassing the voltage supply means 106.
  • the RF input level detection means 109 sends a signal indicating that the power level of the RF input signal has increased to the power supply voltage supply path switching means 108. Therefore, the power supply voltage supply path switching means 108 switches the path of the first battery 104 to the second path, passes the constant power supply voltage supply means 106, and supplies power to the carrier amplifier 102. This is because when the power level of the RF input signal is high, the distortion of the RF input signal is also large. Therefore, when the voltage supplied to the carrier amplifier 102 is decreased, the distortion deterioration of the Doherty amplifier 101 is increased. This means that a constant voltage is supplied to the carrier amplifier 102 via the constant power supply voltage supply means 106.
  • FIG. 8 is a basic circuit diagram of the radio communication apparatus according to Embodiment 4 of the present invention.
  • the wireless communication apparatus of the fourth embodiment shown in FIG. 8 is a combination of the wireless communication apparatus of the second embodiment shown in FIG. 6 and the wireless communication apparatus of the third embodiment shown in FIG. That is, the wireless communication apparatus according to the fourth embodiment determines whether the voltage of the first battery 104 has decreased below a predetermined voltage threshold, and whether the power level of the RF input signal has exceeded a predetermined power threshold. Accordingly, whether or not to use the constant power supply means 106 is determined. Therefore, the power supply path of the carrier amplifier 102 in the wireless communication apparatus of the fourth embodiment shown in FIG. 8 is the constant power supply voltage supply means 106, the power supply voltage drop detection means 107, the power supply voltage supply path switching means 108, and the RF The input level detecting means 109 is configured.
  • power supply voltage drop detection means 107 detects that the voltage of first battery 104 has fallen below a predetermined voltage threshold value
  • RF input level detection means 109 detects the power of the RF input signal.
  • the power supply voltage supply path switching means 108 switches the path of the first battery 104 to the second path passing through the constant power supply voltage supply means 106. This is because distortion deterioration is likely to occur when the power level of the RF input signal is high and the voltage of the first battery 104 is low. In such a state, the first battery 104 supplies a constant power supply voltage supply means. This means that a constant voltage is supplied to the carrier amplifier 102 via 106.
  • the power level of the RF input signal is low, distortion degradation is unlikely to occur even if the voltage of the first battery 104 is low. This means that the power supply voltage may be supplied to
  • the Dono and Tee amplifiers can be made highly efficient and low distortion with a simple circuit configuration, and therefore can be effectively used for mobile communication terminals such as portable terminals. Is possible.

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

Abstract

La présente invention concerne un périphérique de communication sans fil à construction de circuit simple, exempt de détérioration et de distorsion grâce à la réduction de la tension d'alimentation et comportant un amplificateur Doherty. Lorsque la tension d'une première cellule (104) est normale, les moyens de détection de réduction de la tension d'alimentation (107) n'envoient pas de signal indiquant la réduction de tension aux moyens de modification de trajet d'alimentation de tension d'alimentation (108). En outre, le moyen de modification de trajet d'alimentation de tension d'alimentation (108) change le trajet vers un premier trajet qui dévie les moyens d'alimentation (106) constants de tension d'alimentation afin d'acheminer la tension d'une première cellule (104) vers un amplificateur de porteuse (102). Lorsque la tension de la première cellule (104) descend au-dessous d'un seuil de tension, des moyens de détection de réduction de la tension d'alimentation (107) envoie le signal indiquant la réduction de tension au moyen de modification de trajet d'alimentation de tension d'alimentation (108). En outre, les moyens de modification de trajet d'alimentation de tension (108) changent le trajet de la première cellule (104) vers une seconde et procurent une tension constante à l'amplificateur de porteuse (102) en utilisant les moyens d'alimentation de tension d'alimentation constante (106).
PCT/JP2006/314803 2006-07-26 2006-07-26 Périphérique de communication sans fil WO2008012883A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2006/314803 WO2008012883A1 (fr) 2006-07-26 2006-07-26 Périphérique de communication sans fil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2006/314803 WO2008012883A1 (fr) 2006-07-26 2006-07-26 Périphérique de communication sans fil

Publications (1)

Publication Number Publication Date
WO2008012883A1 true WO2008012883A1 (fr) 2008-01-31

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Application Number Title Priority Date Filing Date
PCT/JP2006/314803 WO2008012883A1 (fr) 2006-07-26 2006-07-26 Périphérique de communication sans fil

Country Status (1)

Country Link
WO (1) WO2008012883A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018023043A (ja) * 2016-08-04 2018-02-08 富士通株式会社 電力増幅装置、半導体集積回路および電力増幅装置の制御方法
WO2022113476A1 (fr) * 2020-11-25 2022-06-02 株式会社村田製作所 Circuit d'amplification de puissance, circuit haute fréquence et dispositif de communication

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001320288A (ja) * 2000-03-03 2001-11-16 Matsushita Electric Ind Co Ltd 電源電圧制御装置及び電源電圧制御方法
JP2002094392A (ja) * 2000-09-14 2002-03-29 Matsushita Electric Ind Co Ltd 送信電力制御方法及び送信電力制御装置並びに移動無線局
JP2003051725A (ja) * 2001-06-08 2003-02-21 Trw Inc Ｈｅｍｔ−ｈｂｔドハーティ・マイクロ波増幅器
JP2005033558A (ja) * 2003-07-14 2005-02-03 Toyota Motor Corp 演算増幅器

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001320288A (ja) * 2000-03-03 2001-11-16 Matsushita Electric Ind Co Ltd 電源電圧制御装置及び電源電圧制御方法
JP2002094392A (ja) * 2000-09-14 2002-03-29 Matsushita Electric Ind Co Ltd 送信電力制御方法及び送信電力制御装置並びに移動無線局
JP2003051725A (ja) * 2001-06-08 2003-02-21 Trw Inc Ｈｅｍｔ−ｈｂｔドハーティ・マイクロ波増幅器
JP2005033558A (ja) * 2003-07-14 2005-02-03 Toyota Motor Corp 演算増幅器

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018023043A (ja) * 2016-08-04 2018-02-08 富士通株式会社 電力増幅装置、半導体集積回路および電力増幅装置の制御方法
US10270406B2 (en) 2016-08-04 2019-04-23 Fujitsu Limited Power amplifier, semiconductor integrated circuit, and method of controlling the power amplifier
WO2022113476A1 (fr) * 2020-11-25 2022-06-02 株式会社村田製作所 Circuit d'amplification de puissance, circuit haute fréquence et dispositif de communication

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