JPH0715255A - Power amplifier - Google Patents

Power amplifier

Info

Publication number
JPH0715255A
JPH0715255A JP5158220A JP15822093A JPH0715255A JP H0715255 A JPH0715255 A JP H0715255A JP 5158220 A JP5158220 A JP 5158220A JP 15822093 A JP15822093 A JP 15822093A JP H0715255 A JPH0715255 A JP H0715255A
Authority
JP
Japan
Prior art keywords
circuit
phase
harmonic
amplifying
power 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.)
Pending
Application number
JP5158220A
Other languages
Japanese (ja)
Inventor
Hideyuki Ishiwatari
秀幸 石渡
Kaoru Otsuka
薫 大塚
Juichi Ozaki
寿一 尾崎
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
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 Toshiba Corp filed Critical Toshiba Corp
Priority to JP5158220A priority Critical patent/JPH0715255A/en
Publication of JPH0715255A publication Critical patent/JPH0715255A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Landscapes

  • Amplifiers (AREA)
  • Microwave Amplifiers (AREA)

Abstract

PURPOSE:To provide a power amplifier which can improve efficiency by providing full reflection to a second harmonic wave contained in an amplified signal. CONSTITUTION:In the power amplifier provided with two first and second amplifying elements 12 and 13 and a synthesizer circuit B for synthesizing signals amplified by these amplifying elements 12 and 13, a first phase circuit 14 is connected between the first amplifying element 12 and the synthesizer circuit B so as to advance the phase of the second harmonic wave by 90 deg., and a second phase circuit 15 is connected between the second amplifying element 13 and the synthesizer circuit B so as to delay the phase of the second harmonic wave by 90 deg..

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、マイクロ波帯で使用さ
れる高効率の電力増幅器に関する。FIELD OF THE INVENTION The present invention relates to a high efficiency power amplifier used in the microwave band.

【０００２】[0002]

【従来の技術】デジタル移動通信などマイクロ波帯で使
用される電力増幅器は、高効率および高線形性が要求さ
れる。このような要求に対し、線形性を劣化させずに、
少しでも効率を向上させるため、増幅素子で増幅された
信号の高調波を処理する方法が用いられる。2. Description of the Related Art A power amplifier used in a microwave band such as digital mobile communication is required to have high efficiency and high linearity. For such requirements, without degrading the linearity,
In order to improve the efficiency even a little, a method of processing harmonics of the signal amplified by the amplifying element is used.

【０００３】ここで、高調波処理が行われる従来の電力
増幅器について、図２を参照して説明する。ＩＮは入力
端子で、入力端子ＩＮから信号が入力される。入力され
た信号は入力整合回路２１を通り、その後、点Ａで２分
され増幅素子２２、２３に加えられる。また、増幅素子
２２、２３で増幅された信号はそれぞれ２次高調波処理
フィルタ２４、２５を通り、点Ｂで合成される。合成さ
れた信号は、３次高調波処理フィルタ２６、そして、出
力整合回路２７に加えられ、出力端子ＯＵＴから出力さ
れる。Now, a conventional power amplifier that performs harmonic processing will be described with reference to FIG. IN is an input terminal, and a signal is input from the input terminal IN. The input signal passes through the input matching circuit 21, and then is divided into two at the point A and added to the amplification elements 22 and 23. The signals amplified by the amplification elements 22 and 23 pass through the second harmonic processing filters 24 and 25, respectively, and are combined at the point B. The combined signal is added to the third harmonic processing filter 26 and the output matching circuit 27, and output from the output terminal OUT.

【０００４】なお、２次高調波処理フィルタ２４、２５
は増幅素子２２、２３の出力端面から見て基本波の２次
高調波に対して短絡となるように、また３次高調波処理
フィルタ２６は、増幅素子２２、２３の出力端面から見
て３次高調波に対して開放となるように構成されてい
る。The second harmonic processing filters 24, 25
Is short-circuited with respect to the second harmonic of the fundamental wave when viewed from the output end surfaces of the amplification elements 22 and 23, and the third harmonic processing filter 26 is 3 when viewed from the output end surfaces of the amplification elements 22 and 23. It is configured to be open to the second harmonic.

【０００５】[0005]

【発明が解決しようとする課題】ところで、電力増幅器
は高出力化が要求されており、高出力化に伴って増幅素
子のサイズも次第に大きくなっている。例えば増幅素子
として電界効果トランジスタを用いると、サイズの大型
化によってゲート幅も大きくなる。例えばゲート幅は５
０ｍｍ程度のものが使用される。この程度の大きさの場
合、出力インピーダンスは１〜２Ωとかなり低い値にな
る。このような値の電界効果トランジスタを用いる場
合、２次高調波に対して短絡する回路を従来の方法で作
ろうとすると、回路損失などのために完全な短絡にはな
らず１〜２Ω程度のインピーダンスになってしまうこと
がある。By the way, the power amplifier is required to have a high output, and the size of the amplifying element is gradually increasing with the increase in the output. For example, when a field effect transistor is used as the amplification element, the gate width becomes large due to the increase in size. For example, the gate width is 5
The thing of about 0 mm is used. With this size, the output impedance is a very low value of 1 to 2Ω. When using a field effect transistor with such a value, if a circuit that short-circuits the second harmonic is attempted by the conventional method, it will not be a complete short circuit due to circuit loss, etc. Sometimes becomes.

【０００６】このとき、増幅素子である電界効果トラン
ジスタと２次高調波処理フィルタとが、２次高調波に対
して１〜２Ω程度で整合がとれてしまう。この結果、２
次高調波処理フィルタによって電界効果トランジスタ方
向にはね返されるエネルギーが、２次高調波処理フィル
タで消費されてしまい、効率の向上が図れない。At this time, the field effect transistor which is an amplifying element and the secondary harmonic processing filter are matched with each other with respect to the secondary harmonic by about 1 to 2Ω. As a result, 2
The energy repelled in the direction of the field effect transistor by the second harmonic processing filter is consumed by the second harmonic processing filter, and the efficiency cannot be improved.

【０００７】本発明は、上記した欠点を解決するもの
で、増幅された信号に含まれる２次高調波に対し全反射
を実現し、効率の向上を図る電力増幅器を提供すること
を目的とする。The present invention solves the above-mentioned drawbacks, and an object of the present invention is to provide a power amplifier which realizes total reflection for the second harmonic contained in the amplified signal and improves the efficiency. .

【０００８】[0008]

【課題を解決するための手段】本発明は、１つの信号か
ら分割された信号をそれぞれ増幅する第１および第２の
２つの増幅素子と、この各増幅素子で増幅された信号を
合成する合成回路とを具備した電力増幅器において、前
記第１の増幅素子と前記合成回路の間に２次高調波に対
して位相を９０°進める第１の位相回路を接続し、ま
た、前記第２の増幅素子と前記合成回路の間に２次高調
波に対して位相を９０°遅らせる第２の位相回路を接続
している。According to the present invention, there are provided a first and a second amplifying element for amplifying a signal divided from one signal, respectively, and a synthesizing method for synthesizing the signals amplified by the respective amplifying elements. A power amplifier including a circuit, a first phase circuit for advancing a phase by 90 ° with respect to a second harmonic is connected between the first amplifying element and the combining circuit, and the second amplifying circuit. A second phase circuit that delays the phase by 90 ° with respect to the second harmonic is connected between the element and the combining circuit.

【０００９】また、１つの信号を２つに分割する分岐回
路と、この分岐回路で分割された信号をそれぞれ増幅す
る第１および第２の２つの増幅素子と、この各増幅素子
で増幅された信号を合成する合成回路とを具備した電力
増幅器において、前記第１の増幅素子と前記合成回路の
間に２次高調波に対して位相を変化させる第１の位相回
路を接続し、また、前記第２の増幅素子と前記合成回路
の間に、前記第１の位相回路で位相変化を受けた前記２
次高調波と逆相となるように、２次高調波の位相を変化
させる第２の位相回路を接続している。A branch circuit for dividing one signal into two, two first and second amplifying elements for amplifying the signals divided by the branch circuit, and an amplifier for amplifying the amplified signal by each of the amplifying elements. In a power amplifier including a combining circuit that combines signals, a first phase circuit that changes a phase with respect to a second harmonic is connected between the first amplifying element and the combining circuit, and Between the second amplifying element and the combining circuit, the second phase-changed signal is received by the first phase circuit.
A second phase circuit that changes the phase of the second harmonic is connected so that the second harmonic has an opposite phase.

【００１０】また、１つの信号を複数に分割する分岐回
路と、この分岐回路で分割された信号をそれぞれ増幅す
る複数の増幅素子と、この各増幅素子で増幅された信号
を合成する合成回路とを具備した電力増幅器において、
前記複数の増幅素子と前記合成回路の間に２次高調波に
対して位相を変化させる位相回路をそれぞれ接続し、か
つ、前記２次高調波が前記合成回路で合成される際に、
前記２次高調波が互いに打ち消し合うように、前記各位
相回路の位相量を設定している。A branch circuit for dividing one signal into a plurality of signals, a plurality of amplifying elements for amplifying the signals divided by the branch circuit, and a synthesizing circuit for synthesizing the signals amplified by the respective amplifying elements. In a power amplifier equipped with
When a phase circuit that changes the phase with respect to the second harmonic is connected between the plurality of amplifying elements and the combining circuit, and when the second harmonic is combined by the combining circuit,
The phase amounts of the phase circuits are set so that the second harmonics cancel each other.

【００１１】また、前記複数の増幅素子と前記合成回路
の間にそれぞれ２次高調波に対して振幅を調整する振幅
調整回路を設けている。An amplitude adjusting circuit for adjusting the amplitude of the second harmonic is provided between each of the plurality of amplifying elements and the combining circuit.

【００１２】[0012]

【作用】上記の構成によれば、１つの信号が複数個例え
ば２個に分割される。２分割された信号はそれぞれ第１
の増幅素子と第２の増幅素子で増幅される。そして、第
１の増幅素子で増幅された信号のうち、２次高調波成分
が第１の位相回路により位相が例えば９０°進められ
る。また、第２の増幅素子で増幅された信号のうち、２
次高調波成分は、第１の位相回路で位相変化を受けた２
次高調波と逆相となるように、第２の位相回路１２によ
り例えば位相が９０°遅らせられる。したがって、２つ
の位相回路から出力される２次高調波成分は、互いに位
相が１８０°ずれる。According to the above construction, one signal is divided into a plurality of signals, for example, two signals. The two divided signals are the first
It is amplified by the amplification element and the second amplification element. Then, in the signal amplified by the first amplifying element, the phase of the second harmonic component is advanced by, for example, 90 ° by the first phase circuit. Also, of the signals amplified by the second amplification element, 2
The second harmonic component has undergone a phase change in the first phase circuit.
The second phase circuit 12 delays the phase by, for example, 90 ° so that the second harmonic has a reverse phase. Therefore, the second harmonic components output from the two phase circuits are 180 ° out of phase with each other.

【００１３】この結果、第１および第２の増幅素子で増
幅された信号を合成すると、両信号の２次高調波成分は
互いに打ち消し合う。したがって、増幅素子の出力イン
ピーダンスや位相回路の損失などに関係なく、２次高調
波成分に対しては短絡、つまり全反射となり、増幅素子
の出力インピーダンスが例え低くても２次高調波成分を
増幅素子にはね返すことができ、効率の向上が図れる。As a result, when the signals amplified by the first and second amplifying elements are combined, the second harmonic components of both signals cancel each other out. Therefore, regardless of the output impedance of the amplification element or the loss of the phase circuit, the second harmonic component is short-circuited, that is, totally reflected, and the second harmonic component is amplified even if the output impedance of the amplification element is low. It can be repelled by the element, and the efficiency can be improved.

【００１４】[0014]

【実施例】本発明の一実施例について、図１の回路構成
図を参照して説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the circuit configuration diagram of FIG.

【００１５】ＩＮは入力端子で、入力端子ＩＮから信号
が入力される。入力された信号は入力整合回路１１を通
り、その後、点Ａの分岐回路で２分され増幅素子１２、
１３に加えられ増幅される。なお、増幅素子１２、１３
としては例えば電界トランジスタが用いられる。また、
一方の増幅素子１２には、増幅された信号の２次高調波
に対して位相を９０°進める例えばハイパス型位相回路
１４が接続されている。また、他方の増幅素子１３に
は、増幅された信号の２次高調波に対して位相を９０°
遅らせる例えばローパス型位相回路１５が接続されてい
る。なお、ハイパス型位相回路１４やローパス型位相回
路１５は、図のようにコイルＬやコンデンサＣの組み合
わせで構成される。IN is an input terminal to which a signal is input. The input signal passes through the input matching circuit 11, and then is divided into two by the branch circuit at the point A, and the amplifying element 12,
13 and amplified. In addition, the amplification elements 12 and 13
For example, an electric field transistor is used. Also,
For example, a high-pass type phase circuit 14 that advances the phase by 90 ° with respect to the second harmonic of the amplified signal is connected to one amplification element 12. The other amplification element 13 has a phase of 90 ° with respect to the second harmonic of the amplified signal.
For example, a low-pass type phase circuit 15 for delaying is connected. The high-pass type phase circuit 14 and the low-pass type phase circuit 15 are composed of a combination of a coil L and a capacitor C as shown in the figure.

【００１６】また、両位相回路１４、１５を通った信号
は点Ｂの合成回路で合成され、３次高調波処理フィルタ
１６に加えられる。その後、出力整合回路１７から出力
端子ＯＵＴに加えられ出力される。なお、３次高調波処
理フィルタ１６は増幅素子１２、１３の出力端面から見
て３次高調波に対して開放となるように構成される。上
記した構成によれば、増幅素子１２で増幅された信号の
うち、２次高調波成分は位相回路１４により位相が９０
°進められる。また、増幅素子１３で増幅された信号の
うち、２次高調波成分は位相回路１５により位相が９０
°遅らせられる。したがって、位相回路１４から出力さ
れる２次高調波成分と位相回路１５から出力される２次
高調波成分は、互いに位相が１８０°ずれる。The signals that have passed through both phase circuits 14 and 15 are combined by the combining circuit at point B and added to the third harmonic processing filter 16. After that, the output matching circuit 17 adds the output terminal OUT and outputs it. The third harmonic processing filter 16 is configured to be open to the third harmonic when viewed from the output end faces of the amplification elements 12 and 13. According to the above configuration, the second harmonic component of the signal amplified by the amplifying element 12 has a phase of 90 by the phase circuit 14.
° Can be advanced. The second harmonic component of the signal amplified by the amplifying element 13 has a phase of 90 by the phase circuit 15.
° Can be delayed. Therefore, the second harmonic component output from the phase circuit 14 and the second harmonic component output from the phase circuit 15 are 180 ° out of phase with each other.

【００１７】このため、各増幅素子１２、１３で増幅さ
れた信号を点Ｂの合成回路で合成すると、両信号の２次
高調波成分は互いに打ち消し合う。したがって、増幅素
子１２、１３の出力インピーダンスや位相回路の損失な
どに関係なく、２次高調波成分に対して短絡、つまり全
反射となる。このため、増幅素子１２、１３の出力イン
ピーダンスが例え低くても２次高調波成分を増幅素子１
２、１３にはね返すことができ、効率の向上が図れる。
なお、位相回路１４、１５のＱを十分高い値に選ぶこと
により、基本波や３次高調波に対する位相回路１４、１
５の影響を防ぐことができる。Therefore, when the signals amplified by the amplifying elements 12 and 13 are combined by the combining circuit at the point B, the second harmonic components of both signals cancel each other out. Therefore, regardless of the output impedance of the amplification elements 12 and 13 and the loss of the phase circuit, the second harmonic component is short-circuited, that is, total reflection occurs. For this reason, even if the output impedance of the amplifier elements 12 and 13 is low, the second harmonic component is transmitted to the amplifier element 1.
It can be returned to Nos. 2 and 13 to improve efficiency.
By selecting Q of the phase circuits 14 and 15 to be sufficiently high, the phase circuits 14 and 1 for the fundamental wave and the third harmonics can be selected.
The effect of 5 can be prevented.

【００１８】なお、上記した実施例では、２次高調波成
分の位相を９０°進めたり、遅らせたりする位相回路と
して、ハイパス型位相回路やローパス型位相回路が使用
されているが、他の回路を使用することもできる。ま
た、位相を進めたり、遅らせたりする位相量も９０°で
ある必要はなく、合成される２次高調波成分が逆相とな
るような位相量であればよい。In the above embodiment, a high-pass type phase circuit or a low-pass type phase circuit is used as the phase circuit for advancing or retarding the phase of the second harmonic component by 90 °, but other circuits are used. Can also be used. Further, the phase amount for advancing or retarding the phase does not have to be 90 °, and may be any phase amount so that the combined second harmonic component has an opposite phase.

【００１９】また、１つの入力信号を分岐回路で２つに
分割した例で説明しているが、３個以上に分割すること
もできる。この場合も、３個以上に分割された信号が合
成される際に、２次高調波成分が互いに相殺されるよう
に、２次高調波成分の位相が調整される。その際、必要
に応じて２次高調波成分の振幅の大きさも適宜調整され
る。Although one input signal is divided into two by a branch circuit, it may be divided into three or more. In this case as well, the phases of the secondary harmonic components are adjusted so that the secondary harmonic components cancel each other out when the signals divided into three or more are combined. At that time, the magnitude of the amplitude of the second-order harmonic component is appropriately adjusted as necessary.

【００２０】[0020]

【発明の効果】本発明によれば、増幅素子の出力インピ
ーダンスに関係なく２次高調波成分に対し全反射になる
回路を実現でき、効率の向上が図れる。According to the present invention, it is possible to realize a circuit in which the second harmonic component is totally reflected irrespective of the output impedance of the amplifying element, and the efficiency can be improved.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明の一実施例を示す回路構成図である。FIG. 1 is a circuit configuration diagram showing an embodiment of the present invention.

【図２】従来の例を説明する回路構成図である。FIG. 2 is a circuit configuration diagram illustrating a conventional example.

【符号の説明】[Explanation of symbols]

１１…入力整合回路 １２、１３…増幅素子 １４…ハイパス型位相回路 １５…ローパス型位相回路 １６…３次高調波処理フィルタ １７…出力整合回路 ＩＮ…入力端子 ＯＵＴ…出力端子 11 ... Input matching circuit 12, 13 ... Amplifying element 14 ... High-pass type phase circuit 15 ... Low-pass type phase circuit 16 ... Third harmonic processing filter 17 ... Output matching circuit IN ... Input terminal OUT ... Output terminal

Claims (4)

【特許請求の範囲】[Claims] 【請求項１】 １つの信号から分割された信号をそれぞ
れ増幅する第１および第２の２つの増幅素子と、この各
増幅素子で増幅された信号を合成する合成回路とを具備
した電力増幅器において、前記第１の増幅素子と前記合
成回路の間に２次高調波に対して位相を９０°進める第
１の位相回路を接続し、また、前記第２の増幅素子と前
記合成回路の間に２次高調波に対して位相を９０°遅ら
せる第２の位相回路を接続したことを特徴とする電力増
幅器。1. A power amplifier comprising: first and second two amplifying elements for amplifying a signal divided from one signal, and a combining circuit for combining the signals amplified by the respective amplifying elements. , A first phase circuit for advancing the phase by 90 ° with respect to the second harmonic is connected between the first amplification element and the synthesis circuit, and between the second amplification element and the synthesis circuit. A power amplifier characterized in that a second phase circuit for delaying the phase by 90 ° with respect to the second harmonic is connected. 【請求項２】 １つの信号を２つに分割する分岐回路
と、この分岐回路で分割された信号をそれぞれ増幅する
第１および第２の２つの増幅素子と、この各増幅素子で
増幅された信号を合成する合成回路とを具備した電力増
幅器において、前記第１の増幅素子と前記合成回路の間
に２次高調波に対して位相を変化させる第１の位相回路
を接続し、また、前記第２の増幅素子と前記合成回路の
間に、前記第１の位相回路で位相変化を受けた前記２次
高調波と逆相となるように、２次高調波の位相を変化さ
せる第２の位相回路を接続したことを特徴とする電力増
幅器。2. A branch circuit which divides one signal into two, two first and second amplifying elements which respectively amplify the signals divided by this branch circuit, and an amplifier which is amplified by each amplifying element. In a power amplifier including a combining circuit that combines signals, a first phase circuit that changes a phase with respect to a second harmonic is connected between the first amplifying element and the combining circuit, and Between the second amplification element and the synthesizing circuit, a second harmonic phase is changed so as to have a phase opposite to that of the second harmonic wave that has undergone the phase change in the first phase circuit. A power amplifier characterized by connecting a phase circuit. 【請求項３】 １つの信号を複数に分割する分岐回路
と、この分岐回路で分割された信号をそれぞれ増幅する
複数の増幅素子と、この各増幅素子で増幅された信号を
合成する合成回路とを具備した電力増幅器において、前
記複数の増幅素子と前記合成回路の間に２次高調波に対
して位相を変化させる位相回路をそれぞれ接続し、か
つ、前記２次高調波が前記合成回路で合成される際に、
前記２次高調波が互いに打ち消し合うように、前記各位
相回路の位相量を設定したことを特徴とする電力増幅
器。3. A branch circuit that divides one signal into a plurality, a plurality of amplification elements that respectively amplify the signals divided by the branch circuit, and a combining circuit that combines the signals amplified by the respective amplification elements. In a power amplifier including: a phase circuit that changes a phase with respect to a second harmonic is connected between the plurality of amplifying elements and the combining circuit, and the second harmonic is combined by the combining circuit. When
A power amplifier, wherein the phase amount of each of the phase circuits is set so that the second harmonics cancel each other. 【請求項４】 前記複数の増幅素子と前記合成回路の間
にそれぞれ２次高調波に対して振幅を調整する振幅調整
回路を設けたことを特徴とする請求項３記載の電力増幅
器。4. The power amplifier according to claim 3, wherein an amplitude adjusting circuit for adjusting the amplitude of the second harmonic is provided between each of the plurality of amplifying elements and the combining circuit.
JP5158220A 1993-06-29 1993-06-29 Power amplifier Pending JPH0715255A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5158220A JPH0715255A (en) 1993-06-29 1993-06-29 Power amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5158220A JPH0715255A (en) 1993-06-29 1993-06-29 Power amplifier

Publications (1)

Publication Number Publication Date
JPH0715255A true JPH0715255A (en) 1995-01-17

Family

ID=15666912

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5158220A Pending JPH0715255A (en) 1993-06-29 1993-06-29 Power amplifier

Country Status (1)

Country Link
JP (1) JPH0715255A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000007296A1 (en) * 1998-07-29 2000-02-10 Hitachi, Ltd. Portable telephone
JP2006311300A (en) * 2005-04-28 2006-11-09 Mitsubishi Electric Corp High frequency amplifier
JP2014045337A (en) * 2012-08-27 2014-03-13 Toshiba Corp Power amplification device and transmitter

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000007296A1 (en) * 1998-07-29 2000-02-10 Hitachi, Ltd. Portable telephone
JP2006311300A (en) * 2005-04-28 2006-11-09 Mitsubishi Electric Corp High frequency amplifier
JP2014045337A (en) * 2012-08-27 2014-03-13 Toshiba Corp Power amplification device and transmitter
US9172340B2 (en) 2012-08-27 2015-10-27 Kabushiki Kaisha Toshiba Power amplifying apparatus for amplifying power and transmitter for transmitting signal by amplifying power

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