JP2003298357A - Power amplification method and power amplifier - Google Patents
Power amplification method and power amplifierInfo
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- JP2003298357A JP2003298357A JP2002093517A JP2002093517A JP2003298357A JP 2003298357 A JP2003298357 A JP 2003298357A JP 2002093517 A JP2002093517 A JP 2002093517A JP 2002093517 A JP2002093517 A JP 2002093517A JP 2003298357 A JP2003298357 A JP 2003298357A
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- input signal
- power
- signal
- amplification method
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、電力増幅方法およ
び電力増幅器に関し、さらに詳細には、通信機器あるい
は放送機器などにおける高周波電力増幅装置などを構成
する際に用いて好適な電力増幅方法および電力増幅器に
関し、特に、高効率低歪みの歪み補償増幅装置を構成す
る際に用いて好適な電力増幅方法および電力増幅器に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power amplification method and a power amplifier, and more particularly to a power amplification method and power suitable for use in configuring a high frequency power amplification device in communication equipment or broadcasting equipment. The present invention relates to an amplifier, and particularly to a power amplification method and a power amplifier suitable for use in configuring a high-efficiency and low-distortion distortion compensation amplification device.
【０００２】[0002]
【従来の技術】従来より、通信機器あるいは放送機器な
どにおける高周波電力増幅装置などを構成する際に用い
る電力増幅器においては、広い周波数帯域にわたって低
歪みであって良好な線形性を有することが求められてい
る。このため、電力増幅器における良好な線形性を得る
ための技術として、例えば、ＬＩＮＣ（ＬｉｎｅａｒＡ
ｍｐｌｉｆｉｃａｔｉｏｎ ｗｉｔｈ Ｎｏｎｌｉｎｅ
ａｒ Ｃｏｍｐｏｎｅｎｔｓ）方式などのような、非線
形素子を用いて入力信号を、振幅変動を位相情報に変換
した２つの定振幅信号に変換して増幅する線形増幅方式
による電力増幅方法などの電力増幅器の歪み補償に関す
る技術が提案されている。2. Description of the Related Art Conventionally, a power amplifier used for constructing a high frequency power amplifying device in communication equipment or broadcasting equipment is required to have low distortion and good linearity over a wide frequency band. ing. Therefore, as a technique for obtaining good linearity in a power amplifier, for example, LINC (LinearA)
mpification with Nonline
Distortion of a power amplifier such as a power amplification method by a linear amplification method in which an input signal is converted into two constant amplitude signals in which amplitude fluctuations are converted into phase information by using a non-linear element, such as the ar Components method). Techniques for compensation have been proposed.
【０００３】ここで、ＬＩＮＣ方式とは、非線形素子を
用いた線形増幅方式であり、振幅変動を位相情報に変換
した一定振幅信号を増幅するという手法を用いる。Here, the LINC method is a linear amplification method using a non-linear element, and uses a method of amplifying a constant amplitude signal obtained by converting amplitude fluctuation into phase information.
【０００４】ＬＩＮＣ方式の基本原理は、振幅変動と位
相変動とのいずれか一方、あるいは、両方を持っている
帯域通過の入力信号を、振幅が一定で位相のみの変化が
ある２つの信号に分けて増幅することにある。図１を参
照しながら、この点について説明する。The basic principle of the LINC system is to divide a band-pass input signal having one or both of amplitude fluctuation and phase fluctuation into two signals having a constant amplitude and a change only in phase. To amplify it. This point will be described with reference to FIG.
【０００５】はじめに、式（１）に示す一定の位相のバ
ンドパス信号Ｓａを考える。First, consider the bandpass signal Sa having a constant phase shown in the equation (1).
【０００６】 Ｓ（ａ）＝Ｅ（ｔ）ｃｏｓω０ｔ ・・・式（１） ＥｍをＥ（ｔ）の最大値とすると、 Ｅ（ｔ）＝Ｅｍｓｉｎφ（ｔ） ・・・式（２） と表すことができる。S (a) = E (t) cosω 0 t ... Equation (1) If Em is the maximum value of E (t), then E (t) = Emsinφ (t) Equation (2) It can be expressed as.
【０００７】図１において、信号分割部（コンポーネン
トセパレータ：ＣＯＭＰＯＮＥＮＴＳＥＰＡＲＡＴＯ
Ｒ）１００は、２つの一定のアンプリチュード信号Ｓ１
ａ、Ｓ１ｂを作り出す。ここで、以下の式（３）が成立
する。In FIG. 1, a signal dividing section (component separator: COMPONENTS SEPARATO) is provided.
R) 100 is two constant amplitude signals S1
a, S1b are produced. Here, the following expression (3) is established.
【０００８】 Ｓａ（ｔ）＝（Ｅｍ／２）［ｓｉｎ［ω０ｔ＋φ（ｔ）］−ｓｉｎ［ω０ｔ −φ（ｔ）］］＝Ｓ１ａ（ｔ）−Ｓ２ａ（ｔ） ・・・式（３） ただし、 Ｓ１ａ（ｔ）＝（Ｅｍ／２）ｓｉｎ［ω０ｔ＋φ（ｔ）］ ・・・式（４） Ｓ２ａ（ｔ）＝（Ｅｍ／２）ｓｉｎ［ω０ｔ−φ（ｔ）］ ・・・式（５） である。Sa (t) = (Em / 2) [sin [ω 0 t + φ (t)] − sin [ω 0 t −φ (t)]] = S 1 a (t) −S 2 a (t) (3) However, S1a (t) = (Em / 2) sin [ω 0 t + φ (t)] ... Equation (4) S2a (t) = (Em / 2) sin [ω 0 t−φ (t )] It is Formula (5).
【０００９】従って、Ｇをアンプ部１０２ａ、１０２ｂ
における増幅の利得とすると、増幅されたＧＳａ（ｔ）
は、信号合成部１０４でＧＳ１ａ（ｔ）からＧＳ２ａ
（ｔ）を減算して合成することにより、式（６）に示す
ように表される。Therefore, G is the amplifier section 102a, 102b
And the gain of amplification at
From GS1a (t) to GS2a in the signal combining unit 104.
By subtracting (t) and combining, it is expressed as shown in Expression (6).
【００１０】
ＧＳａ（ｔ）−ＧＳ１ａ（ｔ）＝ＧＥｍｓｉｎφ（ｔ）ｃｏｓω０ｔ＝ＧＳ
ａ（ｔ） ・・・式（６）
これらのことから、２つの一定な振幅角度変調信号は、
その振幅線形性に関わらず十分な帯域でどのような増幅
器によっても増幅されるものであることがわかる。GSa (t) −GS1a (t) = GEmsinφ (t) cosω 0 t = GS a (t) Equation (6) From the above, two constant amplitude angle modulation signals are obtained.
It can be seen that it is amplified by any amplifier in a sufficient band regardless of its amplitude linearity.
【００１１】ところで、Ｗ−ＣＤＭＡ（Ｗｉｄｅｂａｎ
ｄ−Ｃｏｄｅ ＤｉｖｉｓｉｏｎＭｕｌｔｉｐｌｅ Ａ
ｃｃｅｓｓ）などのように包絡線変動を示す変調方式に
おいて、上記した原理を備えたＬＩＮＣ方式による電力
増幅器を用いた場合には、電力合成時において有効電力
に対する無効電力の比率が増加し、効率の低下が著しい
ことが指摘されていた。By the way, W-CDMA (Wideban)
d-Code Division Multiple A
In a modulation method that exhibits envelope fluctuations such as ccess), when a power amplifier based on the LINC method having the above-described principle is used, the ratio of reactive power to active power increases at the time of power combination, and It was pointed out that the decline was remarkable.
【００１２】即ち、ＬＩＮＣ方式においては、その電力
効率は入力信号のピーク電力対平均電力の比によって決
定され、その比が大きいほど無効電力が大きくなり、結
果として電力効率が悪化する。つまり、ＬＩＮＣ方式に
おいては、入力信号の振幅情報を位相情報に変換した上
で信号分割部で２つの一定振幅信号に分割するが、一定
振幅であるため電力合成後の信号振幅が小さい場合（入
力信号の振幅が小さい）には、無効電力が増加すること
になり、そのため電力効率が低下してしまうものであっ
た。That is, in the LINC system, the power efficiency is determined by the ratio of the peak power to the average power of the input signal. The larger the ratio, the larger the reactive power, and the power efficiency deteriorates as a result. That is, in the LINC method, the amplitude information of the input signal is converted into the phase information and then divided into two constant amplitude signals by the signal division unit. However, since the signal amplitude is constant, the signal amplitude after power combination is small (input If the amplitude of the signal is small), the reactive power will increase, resulting in a decrease in power efficiency.
【００１３】こうしたＬＩＮＣ方式における電力効率の
高効率化をはかる手法として、リアクタンスマッチング
法ならびにＲＦ-ＤＣ電力変換法などが提案されてい
る。Reactance matching method, RF-DC power conversion method and the like have been proposed as methods for improving the power efficiency in the LINC method.
【００１４】ここで、リアクタンスマッチング法とは、
増幅器の出力をリアクタンス性終端器で終端することに
より、歪みを多少犠牲にすることにはなるが電力効率を
向上させるという手法である。Here, the reactance matching method is
By terminating the output of the amplifier with a reactive terminator, the distortion is somewhat sacrificed, but the power efficiency is improved.
【００１５】また、ＲＦ−ＤＣ電力変換法とは、電力合
成器で発生する無効電力をＲＦ−ＤＣ変換して、ＤＣ電
源にフィードバックすることにより、全体の電力のロス
を減らし電力増幅器の電力効率を向上させるようにした
ものである。In the RF-DC power conversion method, the reactive power generated in the power combiner is RF-DC converted and fed back to the DC power source to reduce the total power loss and reduce the power efficiency of the power amplifier. It is intended to improve.
【００１６】しかしながら、Ｗ−ＣＤＭＡなどのような
包絡線変動を示す変調方式においてＬＩＮＣ方式で信号
増幅を行う場合には、上記したリアクタンスマッチング
法やＲＦ-ＤＣ電力変換法を用いても、やはり、振幅の
包絡線変動を伴うという信号の性質により、無効電力が
増加して電力の平均効率は低下するという問題点があっ
た。However, in the case of performing signal amplification by the LINC method in a modulation method such as W-CDMA which exhibits envelope fluctuation, even if the reactance matching method or the RF-DC power conversion method described above is used, There is a problem that the reactive power increases and the average efficiency of the power decreases due to the property of the signal that the envelope curve of the amplitude changes.
【００１７】特に、ＬＩＮＣ方式による基地局増幅装置
のＷ−ＣＤＭＡ信号の電力増幅においては、低歪みにて
電力効率を向上させることが重要な問題となっていた。In particular, in the power amplification of the W-CDMA signal of the base station amplifier of the LINC system, it has been an important problem to improve the power efficiency with low distortion.
【００１８】[0018]
【発明が解決しようとする課題】本発明は、上記したよ
うな従来の技術の有する種々の問題点に鑑みてなされた
ものであり、その目的とするところは、振幅の包絡線変
動を伴う信号を増幅する際に、低歪みでの増幅を可能と
するとともに、無効電力の増加を抑制して電力効率の向
上を図ることのできる電力増幅方法および電力増幅器を
提供しようとするものである。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned various problems of the prior art, and an object of the present invention is to provide a signal accompanied by amplitude envelope fluctuation. It is intended to provide a power amplification method and a power amplifier capable of performing amplification with a low distortion when amplifying power, and suppressing increase in reactive power to improve power efficiency.
【００１９】[0019]
【課題を解決するための手段】上記目的を達成するため
に、本発明による電力増幅方法および電力増幅器は、非
線形素子を用いて振幅変動を位相情報に変換した定振幅
信号を増幅する線形増幅方式による電力増幅方法や電力
増幅器において、入力信号の振幅に応じて増幅手段へ入
力される信号の振幅を制御することにより、無効電力の
増加を抑制して電力効率の向上を図るようにしたもので
ある。In order to achieve the above object, a power amplification method and a power amplifier according to the present invention are a linear amplification system for amplifying a constant amplitude signal obtained by converting an amplitude fluctuation into phase information using a non-linear element. In the power amplification method and the power amplifier according to (1), the amplitude of the signal input to the amplification means is controlled according to the amplitude of the input signal to suppress the increase of the reactive power and improve the power efficiency. is there.
【００２０】即ち、ＲＦ信号などの入力信号の振幅に応
じて、増幅手段へ入力される信号の振幅を制御するもの
であり、ＲＦ信号などの入力信号のレベルが低い場合に
顕著となる電力効率の低下を抑制することができる。That is, the amplitude of the signal input to the amplifying means is controlled according to the amplitude of the input signal such as the RF signal, and the power efficiency becomes remarkable when the level of the input signal such as the RF signal is low. Can be suppressed.
【００２１】従来のＬＩＮＣ方式による電力増幅方法や
電力増幅器は、振幅変動をもつ入力信号を２つの定振幅
信号に変換すると同時に、入力信号の振幅情報を当該２
つの変換した定振幅信号に位相変動情報として分配す
る。その際に、本発明による電力増幅方法や電力増幅器
においては、入力信号の包絡線の振幅に従って、入力信
号から変換する２つの定振幅信号の振幅値を多段階に制
御するようにしたものである。これにより、入力信号の
振幅確率密度分布のピーク対平均値の落差に基づく電力
効率、即ち、小信号入力時の無効電力を低減することが
可能となり、平均的な電力効率の向上を図ることができ
る。The conventional LINC power amplification method and power amplifier convert an input signal having amplitude fluctuation into two constant amplitude signals, and at the same time, convert the amplitude information of the input signal into two values.
The converted constant amplitude signals are distributed as phase fluctuation information. At that time, in the power amplification method and power amplifier according to the present invention, the amplitude values of the two constant amplitude signals converted from the input signal are controlled in multiple stages according to the amplitude of the envelope of the input signal. . This makes it possible to reduce the power efficiency based on the difference between the peak and the average value of the amplitude probability density distribution of the input signal, that is, the reactive power when a small signal is input, and to improve the average power efficiency. it can.
【００２２】換言すれば、従来のＬＩＮＣ方式において
は、入力信号から変換された２つの定振幅信号の振幅値
は常に一定値であるが、本発明による電力増幅方法や電
力増幅器においては、入力信号の包絡線のレベル（振
幅）に応じて当該入力信号から変換された２つの定振幅
信号の振幅値を可変するようにしており、これにより電
力効率の向上を図ることができる。In other words, in the conventional LINC system, the amplitude values of the two constant amplitude signals converted from the input signal are always constant, but in the power amplification method and power amplifier according to the present invention, the input signal is The amplitude values of the two constant-amplitude signals converted from the input signal are varied according to the level (amplitude) of the envelope of, and thus power efficiency can be improved.
【００２３】即ち、ＬＩＮＣ方式は、入力信号の包絡線
のレベルの変動を２つの一定振幅信号の位相情報として
変換することにより効率よい電力増幅を実現する手法で
あり、本発明はそれに加えて、この入力信号の包絡線の
レベルの変動を検出して２つの一定振幅信号信号の振幅
値を制御するようにして、小信号入力時の電力損失を小
さく抑えるようにしたものである。That is, the LINC method is a method for realizing efficient power amplification by converting the fluctuation of the level of the envelope of the input signal as the phase information of the two constant amplitude signals. The fluctuation of the level of the envelope of the input signal is detected and the amplitude values of the two constant amplitude signal signals are controlled to suppress the power loss when a small signal is input.
【００２４】本発明のうちの請求項１に記載の発明は、
非線形素子を用いて入力信号を、振幅変動を位相情報に
変換した２つの定振幅信号に変換して増幅する線形増幅
方式による電力増幅方法において、入力信号の振幅に応
じて、２つの定振幅信号の振幅値をデジタル信号処理を
適用して制御するようにしたものである。The invention according to claim 1 of the present invention is
In a power amplification method using a linear amplification method, in which an input signal is converted into two constant amplitude signals in which amplitude fluctuations are converted into phase information by using a non-linear element and then amplified, two constant amplitude signals are output according to the amplitude of the input signal. The amplitude value of is controlled by applying digital signal processing.
【００２５】また、本発明のうちの請求項２に記載の発
明は、非線形素子を用いて入力信号を、振幅変動を位相
情報に変換した２つの定振幅信号に変換して増幅する線
形増幅方式による電力増幅方法において、入力信号の包
絡線の振幅に応じて、２つの定振幅信号の振幅値を多段
階に制御するようにしたものである。The invention according to claim 2 of the present invention is a linear amplification system in which an input signal is converted into two constant-amplitude signals obtained by converting amplitude fluctuations into phase information by using a non-linear element for amplification. In the power amplification method according to, the amplitude values of the two constant amplitude signals are controlled in multiple stages according to the amplitude of the envelope of the input signal.
【００２６】また、本発明のうちの請求項３に記載の発
明は、本発明のうちの請求項２に記載の発明において、
入力信号の包絡線の振幅の瞬時値に応じて、２つの定振
幅信号の振幅値を多段階に制御するようにしたものであ
る。The invention according to claim 3 of the present invention is the invention according to claim 2 of the present invention,
According to the instantaneous value of the amplitude of the envelope of the input signal, the amplitude values of the two constant amplitude signals are controlled in multiple stages.
【００２７】また、本発明のうちの請求項４に記載の発
明は、本発明のうちの請求項２または請求項３のいずれ
か１項に記載の発明において、入力信号のピーク電力対
平均電力比を検知し、該検知結果に応じて上記多段階の
レベルを制御するようにしたものである。The invention according to claim 4 of the present invention is the invention according to claim 2 or 3 of the present invention, wherein the peak power vs. average power of the input signal. The ratio is detected, and the multilevel levels are controlled according to the detection result.
【００２８】また、本発明のうちの請求項５に記載の発
明は、本発明のうちの請求項２または請求項３のいずれ
か１項に記載の発明において、入力信号の振幅確率密度
分布関数を検知し、該検知結果に応じて上記多段階のレ
ベルを制御するようにしたものである。The invention according to claim 5 of the present invention is the amplitude probability density distribution function of an input signal according to the invention according to claim 2 or 3, of the invention. Is detected, and the multi-step levels are controlled according to the detection result.
【００２９】また、本発明のうちの請求項６に記載の発
明は、非線形素子を用いて入力信号を、振幅変動を位相
情報に変換した２つの定振幅信号に変換して増幅する線
形増幅方式による電力増幅器において、入力信号の包絡
線の振幅を検出する検出手段と、上記検出手段による検
出結果に応じて、２つの定振幅信号の振幅値を多段階に
制御する振幅制御手段とを有するようにしたものであ
る。The invention according to claim 6 of the present invention is a linear amplification system in which a non-linear element is used to convert and amplify an input signal into two constant amplitude signals in which amplitude fluctuations are converted into phase information. In the power amplifier according to the present invention, there is provided a detection means for detecting the amplitude of the envelope of the input signal, and an amplitude control means for controlling the amplitude values of the two constant amplitude signals in multiple stages according to the detection result by the detection means. It is the one.
【００３０】また、本発明のうちの請求項７に記載の発
明は、本発明のうちの請求項６に記載の発明において、
上記検出手段は、入力信号の包絡線の振幅の瞬時値を検
出するようにしたものである。The invention according to claim 7 of the present invention is the invention according to claim 6 of the present invention,
The detection means is adapted to detect the instantaneous value of the amplitude of the envelope of the input signal.
【００３１】また、本発明のうちの請求項８に記載の発
明は、本発明のうちの請求項６または請求項７のいずれ
か１項に記載の発明において、さらに、入力信号のピー
ク電力対平均電力比を検知する検知手段と、上記検知手
段の検知結果に応じて、上記多段階のレベルを制御する
制御手段とを有するようにしたものである。Further, the invention according to claim 8 of the present invention is the invention according to claim 6 or 7 of the present invention, further comprising: The detection means for detecting the average power ratio and the control means for controlling the multi-levels according to the detection result of the detection means are provided.
【００３２】また、本発明のうちの請求項９に記載の発
明は、本発明のうちの請求項６または請求項７のいずれ
か１項に記載の発明において、さらに、入力信号の振幅
確率密度分布関数を検知する検知手段と、上記検知手段
の検知結果に応じて、上記多段階のレベルを制御する制
御手段とを有するようにしたものである。The invention according to claim 9 of the present invention is the invention according to claim 6 or 7 of the present invention, further comprising the amplitude probability density of the input signal. The detection means for detecting the distribution function and the control means for controlling the multi-levels according to the detection result of the detection means are provided.
【００３３】[0033]
【発明の実施の形態】以下、添付の図面に基づいて、本
発明による電力増幅器の実施の形態の一例について詳細
に説明するものとする。BEST MODE FOR CARRYING OUT THE INVENTION An example of an embodiment of a power amplifier according to the present invention will be described in detail below with reference to the accompanying drawings.
【００３４】図２には、本発明による電力増幅器の実施
の形態の一例のブロック構成図が示されている。FIG. 2 is a block diagram showing an example of the embodiment of the power amplifier according to the present invention.
【００３５】この電力増幅器は、非線形素子を用いて振
幅変動を位相情報に変換した定振幅信号を増幅する線形
増幅方式による電力増幅器であり、外部からの入力され
た入力信号をＩＦ信号に周波数変換するＲＦダウンコン
バータ１０と、アナログ／デジタル変換（Ａ／Ｄ変換）
によりＲＦダウンコンバータ１０から出力されたアナロ
グ信号たる入力信号（ＩＦ信号）をデジタル信号に変換
するアナログ／デジタル（Ａ／Ｄ）コンバータ１２と、
Ａ／Ｄコンバータ１２によりＡ／Ｄ変換された入力信号
をＩＱ分配するＩＱ分配部１４と、ＩＱ分配部１４によ
りＩＱ分配された入力信号を直交座標系から極座標系に
変換する直交−極座標変換部１６と、直交−極座標変換
部１６により直交座標系から極座標系に変換された入力
信号を入力される信号分割部（ＳＣＳ：ＳＩＧＮＡＬ
ＣＯＭＰＯＮＥＮＴ ＳＥＰＡＲＡＴＯＲ）１８と、直
交−極座標変換部１６により直交座標系から極座標系に
変換された入力信号を入力される包絡線レベル検出部２
０と、信号分割部１８により入力信号の振幅変動を位相
情報に変換することにより当該入力信号を２つに分割し
て生成した分割信号を入力するとともに包絡線レベル検
出部２０からの検出信号を入力して該検出信号に応じて
該分割信号の振幅制御を行う振幅制御部２２と、振幅制
御部２２により振幅制御された分割信号をそれぞれデジ
タル／アナログ（Ｄ／Ａ）変換してアナログ信号に変換
するデジタル／アナログ（Ｄ／Ａ）コンバータ２４と、
Ｄ／Ａコンバータ２４から出力されたデジタル信号をそ
れぞれ周波数変換するＲＦアップコンバータ２６ａ、２
６ｂと、ＲＦアップコンバータ２６ａ、２６ｂにより周
波数変換されたデジタル信号をそれぞれ増幅するアンプ
（Ａｍｐ）部２８ａ、２８ｂと、アンプ部２８ａ、２８
ｂにより増幅されたデジタル信号を合成して出力信号と
して出力するＲＦパワーコンバイナ（ＲＦ ＰＯＷＥＲ
ＣＯＭＢＩＮＥＲ）およびカップラー（ＣＯＵＰＬＥ
Ｒ）よりなる信号合成部３０とを有して構成されてい
る。This power amplifier is a power amplifier of a linear amplification system which amplifies a constant amplitude signal obtained by converting amplitude fluctuation into phase information using a non-linear element, and frequency-converts an input signal input from the outside into an IF signal. RF down converter 10 and analog / digital conversion (A / D conversion)
An analog / digital (A / D) converter 12 for converting an input signal (IF signal), which is an analog signal output from the RF down converter 10, into a digital signal;
An IQ distributor 14 that IQ-distributes the input signal A / D converted by the A / D converter 12, and an orthogonal-polar coordinate converter that converts the input signal IQ-distributed by the IQ distributor 14 from a rectangular coordinate system to a polar coordinate system. 16 and a signal division unit (SCS: SIGNAL) to which the input signal converted from the rectangular coordinate system to the polar coordinate system by the orthogonal-polar coordinate conversion unit 16 is input.
COMPONENT SEPAATOR) 18 and the envelope level detection unit 2 to which the input signal converted from the rectangular coordinate system to the polar coordinate system by the orthogonal-polar coordinate conversion unit 16 is input.
0 and the division signal generated by dividing the input signal into two by converting the amplitude fluctuation of the input signal into phase information by the signal division unit 18 and inputting the detection signal from the envelope level detection unit 20. An amplitude control unit 22 that inputs and controls the amplitude of the divided signal according to the detection signal and a divided signal whose amplitude is controlled by the amplitude control unit 22 is digital-to-analog (D / A) converted into an analog signal. A digital / analog (D / A) converter 24 for converting,
RF up-converters 26a and 2 for frequency-converting the digital signals output from the D / A converter 24, respectively.
6b, amplifier (Amp) units 28a and 28b for amplifying the digital signals frequency-converted by the RF up-converters 26a and 26b, and amplifier units 28a and 28, respectively.
RF power combiner (RF POWER) that synthesizes the digital signals amplified by b and outputs as an output signal
COMBINER and coupler (COUPLE)
R) and the signal synthesis unit 30.
【００３６】以上の構成において、図３に示す本発明に
よる電力増幅器の動作を説明するための振幅制御概念図
ならびに図４に示す振幅制御の処理に関するフローチャ
ートを参照しながら、本発明による電力増幅器の実施の
形態の一例の動作を説明する。With the above configuration, referring to the amplitude control conceptual diagram for explaining the operation of the power amplifier according to the present invention shown in FIG. 3 and the flow chart regarding the amplitude control process shown in FIG. 4, the power amplifier according to the present invention will be described. The operation of the example of the embodiment will be described.
【００３７】入力信号は、ＲＦダウンコンバータ１０に
おいてＩＦ信号に周波数変換され、さらにＡ／Ｄコンバ
ータ１２によりＡ／Ｄ変換された後に、ＩＱ分配部１４
においてＩＱ分配される。そして、ＩＱ分配部１４にお
いてＩＱ分配された入力信号は、信号分割部１８と包絡
線レベル検出部２０とに送られる。The input signal is frequency-converted into an IF signal in the RF down converter 10, further A / D converted by the A / D converter 12, and then the IQ distributor 14
Is IQ distributed at. Then, the input signal IQ-distributed by the IQ distributor 14 is sent to the signal divider 18 and the envelope level detector 20.
【００３８】信号分割部１８においては、ＩＱ分配され
た入力信号が、振幅変動分を位相に変換した所定の振幅
値を持つ２つの分割信号Ｓ１、Ｓ２に分割される。In the signal dividing unit 18, the IQ-divided input signal is divided into two divided signals S1 and S2 having a predetermined amplitude value obtained by converting the amplitude variation into a phase.
【００３９】一方、包絡線レベル検出部２０において
は、図４のフローチャートに示す振幅制御の処理を実行
し、検出した入力信号の包絡線レベルと予め設定してお
いたしきい値とを逐次に比較し、その比較結果に基づい
て分割信号の振幅を制御する振幅制御部２２に対する処
理を行う。On the other hand, the envelope level detecting section 20 executes the amplitude control process shown in the flowchart of FIG. 4, and sequentially compares the detected envelope level of the input signal with a preset threshold value. Then, processing is performed on the amplitude control unit 22 that controls the amplitude of the divided signal based on the comparison result.
【００４０】即ち、ＩＱ分配された入力信号の包絡線の
レベルを検出し（ステップＳ４０２）、入力信号の包絡
線のレベルがしきい値を越えるように変化したか、即
ち、入力信号の包絡線のレベルがしきい値を下から上に
切るように変化したかを判断し（ステップＳ４０４）、
入力信号の包絡線のレベルがしきい値を越えるように変
化した、即ち、入力信号の包絡線のレベルがしきい値を
下から上に切るように変化したと判断された場合には、
分割信号の振幅制御を行う振幅制御部２２において分割
信号に付与する振幅値である出力振幅値を大レベルの値
に設定する（ステップＳ４０６）。That is, the level of the envelope curve of the IQ-distributed input signal is detected (step S402), and the level of the envelope curve of the input signal has changed so as to exceed the threshold, that is, the envelope curve of the input signal. It is determined whether the level of has changed so as to cut the threshold value from the bottom to the top (step S404),
When it is determined that the level of the envelope of the input signal has changed so as to exceed the threshold value, that is, the level of the envelope of the input signal has changed so as to cut the threshold value from below to above,
The amplitude control unit 22 that controls the amplitude of the divided signal sets the output amplitude value, which is the amplitude value given to the divided signal, to a large level value (step S406).
【００４１】一方、ステップＳ４０４の処理において、
入力信号の包絡線のレベルがしきい値を越えるように変
化したとは判断されなかった場合には、入力信号の包絡
線のレベルがしきい値を越えないように変化したか、即
ち、入力信号の包絡線のレベルがしきい値を上から下に
切るように変化したかを判断する（ステップＳ４０
８）。On the other hand, in the processing of step S404,
If it is not determined that the level of the envelope of the input signal has exceeded the threshold value, then the level of the envelope of the input signal has changed without exceeding the threshold value, that is, the input It is determined whether the level of the envelope of the signal has changed so as to cut the threshold value from the upper side to the lower side (step S40).
8).
【００４２】ここで、ステップＳ４０８の処理におい
て、入力信号の包絡線のレベルがしきい値を越えないよ
うに変化した、即ち、入力信号の包絡線のレベルがしき
い値を上から下に切るように変化したと判断された場合
には、分割信号の振幅制御を行う振幅制御部２２におい
て分割信号に付与する振幅値である出力振幅値を小レベ
ルの値に設定する（ステップＳ４１０）。Here, in the processing of step S408, the level of the envelope of the input signal has changed so as not to exceed the threshold, that is, the level of the envelope of the input signal cuts the threshold from the upper side to the lower side. If it is determined that the amplitude has changed, the amplitude control unit 22 that controls the amplitude of the divided signal sets the output amplitude value, which is the amplitude value to be added to the divided signal, to a small level value (step S410).
【００４３】一方、ステップＳ４０８の処理において、
入力信号の包絡線のレベルがしきい値を越えないように
変化したとは判断されなかった場合、即ち、入力信号の
包絡線のレベルがしきい値を切るようには変化しなかっ
た場合、換言すれば、入力信号の包絡線のレベルがしき
い値を跨ぐようには変化しなかった場合には、分割信号
の振幅制御を行う振幅制御部２２において分割信号に付
与する振幅値である出力振幅値のレベルを変化しない。On the other hand, in the processing of step S408,
When it is not determined that the level of the envelope of the input signal has changed so as not to exceed the threshold value, that is, when the level of the envelope of the input signal does not change so as to fall below the threshold value, In other words, when the level of the envelope of the input signal does not change so as to cross the threshold value, the output that is the amplitude value given to the divided signal in the amplitude control unit 22 that controls the amplitude of the divided signal. Does not change the amplitude level.
【００４４】ここで、図３に示す振幅制御概念図を参照
すると、地点Ａにおいては、入力信号の包絡線のレベル
がしきい値を越えるように変化した、即ち、入力信号の
包絡線のレベルがしきい値を下から上に切るように変化
したと判断され、分割信号の振幅制御を行う振幅制御部
２２において分割信号に付与する振幅値である出力振幅
値を、小レベルから大レベルの値に変化させる（ステッ
プＳ４０４→ステップＳ４０６）。Here, referring to the amplitude control conceptual diagram shown in FIG. 3, at the point A, the level of the envelope of the input signal changes so as to exceed the threshold, that is, the level of the envelope of the input signal. Is determined to have changed from below to above the threshold value, and the output amplitude value, which is the amplitude value given to the divided signal in the amplitude control unit 22 that controls the amplitude of the divided signal, is changed from a small level to a large level. The value is changed (step S404 → step S406).
【００４５】一方、図３に示す地点Ｂにおいては、入力
信号の包絡線のレベルがしきい値を越えないように変化
した、即ち、入力信号の包絡線のレベルがしきい値を上
から下に切るように変化したと判断され、分割信号の振
幅制御を行う振幅制御部２２において分割信号に付与す
る振幅値である出力振幅値を、大レベルから小レベルの
値に変化させる（ステップＳ４０４→ステップＳ４０８
→ステップＳ４１０）。On the other hand, at the point B shown in FIG. 3, the level of the envelope of the input signal changes so as not to exceed the threshold, that is, the level of the envelope of the input signal changes from above the threshold to below the threshold. The output amplitude value, which is the amplitude value given to the divided signal in the amplitude control unit 22 that controls the amplitude of the divided signal, is changed from the large level to the small level value (step S404 → Step S408
→ Step S410).
【００４６】さらに、図３に示す地点Ｃにおいては、入
力信号の包絡線のレベルがしきい値を越えるように変化
した、即ち、入力信号の包絡線のレベルがしきい値を下
から上に切るように変化したと判断され、分割信号の振
幅制御を行う振幅制御部２２において分割信号に付与す
る振幅値である出力振幅値を、小レベルから大レベルの
値に変化させる（ステップＳ４０４→ステップＳ４０
６）。Further, at the point C shown in FIG. 3, the level of the envelope of the input signal changes so as to exceed the threshold, that is, the level of the envelope of the input signal goes from the bottom to the top. It is determined that the output signal has changed so as to cut, and the amplitude control unit 22 that controls the amplitude of the divided signal changes the output amplitude value, which is the amplitude value given to the divided signal, from the small level to the large level value (step S404 → step). S40
6).
【００４７】そして、振幅変動分を位相に変換され一定
振幅に分割された分割信号Ｓ１、Ｓ２は、包絡線レベル
検出部２０により出力振幅値のレベルを制御された振幅
制御部２２においてその振幅値を制御される。即ち、包
絡線がしきい値を超えない場合は分割信号の出力振幅値
を小レベルとするように制御され、また、しきい値を超
えた場合は分割信号の出力振幅値を大レベルとするよう
に制御される。Then, the divided signals S1 and S2, whose amplitude fluctuations are converted into phases and divided into constant amplitudes, have their amplitude values in the amplitude control unit 22 whose output amplitude value level is controlled by the envelope level detection unit 20. Is controlled. That is, when the envelope does not exceed the threshold value, the output amplitude value of the divided signal is controlled to a small level, and when it exceeds the threshold value, the output amplitude value of the divided signal is set to a large level. Controlled as.
【００４８】従って、包絡線レベルがしきい値を下から
上へ切る場合（図３における地点Ａ、図３における地点
Ｃ）には、信号ベクトルの単位円は、小レベルの出力振
幅値に対応する小径の円から大レベルの出力振幅値に対
応する大径の円へ移るとともに、２つのベクトルの位相
角は広がることになる（図３を参照する。）。逆に包絡
線レベルがしきい値を上から下に切る場合（図３におけ
る地点Ｂ）には、信号ベクトルの単位円は、大レベルの
出力振幅値に対応する大径の円から小レベルの出力振幅
値に対応する小径の円へ移行して位相角は狭まることに
なる（図３を参照する。）。Therefore, when the envelope level cuts the threshold value from the bottom to the top (point A in FIG. 3, point C in FIG. 3), the unit circle of the signal vector corresponds to the output amplitude value of the small level. The phase angle of the two vectors widens with the transition from a small diameter circle to a large diameter circle corresponding to a large level output amplitude value (see FIG. 3). On the contrary, when the envelope level cuts the threshold value from the upper side to the lower side (point B in FIG. 3), the unit circle of the signal vector changes from the large-diameter circle corresponding to the large-level output amplitude value to the small-level circle. The phase angle is narrowed by shifting to a small diameter circle corresponding to the output amplitude value (see FIG. 3).
【００４９】このように、本発明による電力増幅器によ
れば、包絡線がしきい値を越えない状態のときには分割
信号の振幅が小さくなって、２つに分割した分割信号の
位相角が広がらないことになり、小振幅時の無効電力を
小さく抑えることができるようになる。As described above, according to the power amplifier of the present invention, when the envelope does not exceed the threshold value, the amplitude of the divided signal becomes small, and the phase angle of the divided signal divided into two does not spread. Therefore, it becomes possible to suppress the reactive power at the time of small amplitude to be small.
【００５０】さらに、上記のようにして振幅制御部２２
において入力信号の包絡線のレベルに応じて振幅制御さ
れた分割信号Ｓ１、Ｓ２は、Ｄ／Ａコンバータ２４によ
りアナログ信号にＤ／Ａ変換され、さらにＲＦアップコ
ンバータ２６ａ、２６ｂにより周波数変換された後に、
アンプ部２８ａ、２８ｂでそれぞれ増幅された後に信号
合成部３２０合成されて出力信号となる。Further, the amplitude control section 22 is operated as described above.
The divided signals S1 and S2 whose amplitude is controlled in accordance with the level of the envelope of the input signal are D / A converted into analog signals by the D / A converter 24, and further frequency-converted by the RF up converters 26a and 26b. ,
The signals are amplified by the amplifiers 28a and 28b and then combined by the signal combiner 320 to form an output signal.
【００５１】以上において説明したように、本発明によ
る電力増幅器によれば、入力信号の包絡線レベルの変動
を２つの一定振幅信号の位相情報として変換することに
より、効率よい電力増幅を実現することができるととも
に、それに加えて、入力信号の包絡線の変動のレベルを
検出して、アンプ部２８ａ、２８ｂへ入力される分割信
号のレベルを入力信号の包絡線の変動のレベルに応じて
変化させて、アンプ部２８ａ、２８ｂでの小信号入力時
の電力損失を小さく抑えることができる。As described above, the power amplifier according to the present invention realizes efficient power amplification by converting the fluctuation of the envelope level of the input signal as the phase information of the two constant amplitude signals. In addition to this, the level of variation of the envelope of the input signal is detected, and the level of the divided signal input to the amplifier units 28a and 28b is changed according to the level of variation of the envelope of the input signal. Thus, the power loss at the time of inputting a small signal in the amplifier units 28a and 28b can be suppressed to be small.
【００５２】なお、上記した実施の形態においては、し
きい値を１つ設定して入力信号の包絡線の変動のレベル
を２段階のレベルに分割し、それに応じて振幅制御部２
２における分割信号の出力振幅値ならびに信号ベクトル
の単位円の大きさが２段階のレベルとなるように設定し
たが、これに限られるものではないことは勿論であり、
しきい値を２つ以上設定して入力信号の包絡線の変動の
レベルを３段階以上の多段階に分割するようにして、そ
れに応じて振幅制御部２２における分割信号の出力振幅
値ならびに信号ベクトルの単位円の大きさが３段階以上
の多段階となるように設定してもよい。In the above embodiment, one threshold value is set to divide the level of fluctuation of the envelope of the input signal into two levels, and the amplitude control section 2 is accordingly divided.
Although the output amplitude value of the divided signal in 2 and the size of the unit circle of the signal vector are set to have two levels, it goes without saying that the present invention is not limited to this.
By setting two or more threshold values to divide the level of fluctuation of the envelope of the input signal into multiple stages of three or more stages, the output amplitude value and signal vector of the divided signal in the amplitude control unit 22 are correspondingly divided. The size of the unit circle may be set in multiple stages of three or more stages.
【００５３】例えば、図５には、しきい値レベル１、し
きい値レベル２およびしきい値レベル３の異なる３種類
の値のしきい値を設定して、包絡線の変動のレベルを４
段階のレベルに分割し、それに応じて振幅制御部２２に
おける分割信号の出力振幅値ならびに信号ベクトルの単
位円の大きさが４段階のレベルとなるように設定した例
が示されている。このようにすると、包絡線の変動のレ
ベルを２段階のレベルに分割する場合と比較するとより
精密な制御を行うことができるようになり、電力損失を
より一層小さく抑えることが可能となる。For example, in FIG. 5, thresholds of three different values of threshold level 1, threshold level 2 and threshold level 3 are set, and the level of variation of the envelope is set to 4
An example is shown in which the level is divided into levels and the output amplitude value of the divided signal in the amplitude control unit 22 and the size of the unit circle of the signal vector are set to four levels accordingly. By doing so, more precise control can be performed as compared with the case where the level of fluctuation of the envelope is divided into two levels, and the power loss can be further suppressed.
【００５４】また、振幅制御部２２における分割信号の
出力振幅値ならびに信号ベクトルの単位円の大きさの切
り換えのタイミングは、入力信号の包絡線の振幅の瞬時
値としきい値とを比較した結果に応じて切り換えるよう
にすればよい。The timing of switching the output amplitude value of the divided signal and the size of the unit circle of the signal vector in the amplitude control unit 22 is determined by comparing the instantaneous value of the amplitude of the envelope of the input signal with the threshold value. The switching may be made accordingly.
【００５５】さらに、上記したしきい値の数ならびにし
きい値のレベルは、入力信号のピーク電力対平均電力比
を検知し、その検知結果に応じて最適なしきい値の数な
らびにしきい値のレベルを可変するようにして、それに
より分割信号の出力振幅値ならびに信号ベクトルの単位
円の大きさに関する多段階のレベルを制御するようにし
てもよい。Furthermore, the number of thresholds and the level of thresholds described above detect the peak power to average power ratio of the input signal, and the optimum number of thresholds and thresholds of the thresholds are detected according to the detection result. The level may be made variable so as to control the output amplitude value of the divided signal and the multi-step level relating to the size of the unit circle of the signal vector.
【００５６】さらにまた、上記したしきい値の数ならび
にしきい値のレベルは、入力信号の振幅確率密度分布関
数を検知し、その検知結果に応じて最適なしきい値の数
ならびにしきい値のレベルを可変するようにして、それ
により分割信号の出力振幅値ならびに信号ベクトルの単
位円の大きさに関する多段階のレベルを制御するように
してもよい。Furthermore, the number of thresholds and the level of the thresholds described above are detected by detecting the amplitude probability density distribution function of the input signal, and the optimum number of thresholds and the threshold value are detected according to the detection result. The level may be made variable so as to control the output amplitude value of the divided signal and the multi-step level relating to the size of the unit circle of the signal vector.
【００５７】[0057]
【発明の効果】本発明は、以上説明したように構成され
ているので、振幅の包絡線変動を伴う信号を増幅する際
に、低歪みでの増幅が可能となるとともに、無効電力の
増加を抑制して電力効率の向上を図ることができるよう
になるという優れた効果を奏する。EFFECTS OF THE INVENTION Since the present invention is configured as described above, when amplifying a signal accompanied by amplitude envelope fluctuation, it is possible to perform amplification with low distortion and increase the reactive power. This has an excellent effect that the power efficiency can be suppressed and the power efficiency can be improved.
【００５８】即ち、本発明によれば、包絡線のレベルに
応じてアンプへの入力信号のレベルを適宜に制御するこ
とにより、Ｗ−ＣＤＭＡ変調方式のように信号包絡線が
一定ではなく包絡線変動が顕著な変調波を増幅する場合
における電力効率の低下を抑えることができるようにな
る。That is, according to the present invention, by appropriately controlling the level of the input signal to the amplifier according to the level of the envelope, the signal envelope is not constant as in the W-CDMA modulation system, but the envelope is constant. It is possible to suppress a decrease in power efficiency when amplifying a modulated wave with a remarkable fluctuation.
【図１】ＬＩＮＣ方式の基本原理の説明図である。FIG. 1 is an explanatory diagram of a basic principle of a LINC method.
【図２】本発明による電力増幅器の実施の形態の一例を
示すブロック構成図である。FIG. 2 is a block configuration diagram showing an example of an embodiment of a power amplifier according to the present invention.
【図３】本発明による電力増幅器の動作を説明するため
の振幅制御概念図である。FIG. 3 is an amplitude control conceptual diagram for explaining the operation of the power amplifier according to the present invention.
【図４】本発明による電力増幅器の実施の形態の一例の
分割信号の振幅制御の処理に関するフローチャートであ
る。FIG. 4 is a flowchart relating to processing of amplitude control of divided signals in an example of an embodiment of a power amplifier according to the present invention.
【図５】本発明による電力増幅器の他の実施の形態を示
す図３に対応する振幅制御概念図である。5 is a conceptual diagram of amplitude control corresponding to FIG. 3 showing another embodiment of the power amplifier according to the present invention.
１０ ＲＦダウンコンバータ
１２ アナログ／デジタル（Ａ／Ｄ）コンバータ
１４ ＩＱ分配部
１６ 直交−極座標変換部
１８ 信号分割部（ＳＣＳ：ＳＩＧＮＡＬ ＣＯＭ
ＰＯＮＥＮＴ ＳＥＰＡＲＡＴＯＲ）
２０ 包絡線レベル検出部
２２ 振幅制御部
２４ デジタル／アナログ（Ｄ／Ａ）コンバータ
２６ａ、２６ｂ ＲＦアップコンバータ
２８ａ、２８ｂ アンプ（Ａｍｐ）部
３０ 信号合成部
１００ 信号分割部（コンポーネントセパレータ：
ＣＯＭＰＯＮＥＮＴＳＥＰＡＲＡＴＯＲ）
１０２ａ、１０２ｂ アンプ部
１０４ 信号合成部10 RF Down Converter 12 Analog / Digital (A / D) Converter 14 IQ Distributor 16 Orthogonal-Polar Coordinate Converter 18 Signal Divider (SCS: SIGNAL COM
PONENT SEPAATOR 20 Envelope level detector 22 Amplitude controller 24 Digital / analog (D / A) converters 26a, 26b RF up-converters 28a, 28b Amplifier (Amp) unit 30 Signal combiner 100 Signal divider (component separator:
COMPONENTS SEPARATOR) 102a, 102b Amplifier section 104 Signal combining section
───────────────────────────────────────────────────── フロントページの続き (72)発明者 瀬川 直明 東京都調布市柴崎２丁目１番地３ 島田理 化工業株式会社内 (72)発明者 村本 研治 東京都調布市柴崎２丁目１番地３ 島田理 化工業株式会社内 (72)発明者 中山 正敏 東京都千代田区丸の内二丁目２番３号 三 菱電機株式会社内 Ｆターム(参考） 5J092 AA01 AA41 CA21 CA36 FA01 HA00 KA00 KA34 KA53 KA55 KA68 SA13 TA01 TA02 TA06 TA07 5J500 AA01 AA41 AC21 AC36 AF01 AH00 AK00 AK34 AK53 AK55 AK68 AS13 AT01 AT02 AT06 AT07 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Naoaki Segawa 2-1-1 Shibasaki, Chofu-shi, Tokyo Osamu Shimada Chemical Industry Co., Ltd. (72) Inventor Kenji Muramoto 2-1-1 Shibasaki, Chofu-shi, Tokyo Osamu Shimada Chemical Industry Co., Ltd. (72) Inventor Masatoshi Nakayama 2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo Inside Ryo Electric Co., Ltd. F term (reference) 5J092 AA01 AA41 CA21 CA36 FA01 HA00 KA00 KA34 KA53 KA55 KA68 SA13 TA01 TA02 TA06 TA07 5J500 AA01 AA41 AC21 AC36 AF01 AH00 AK00 AK34 AK53 AK55 AK68 AS13 AT01 AT02 AT06 AT07
Claims (9)
動を位相情報に変換した２つの定振幅信号に変換して増
幅する線形増幅方式による電力増幅方法において、 入力信号の振幅に応じて、２つの定振幅信号の振幅値を
デジタル信号処理を適用して制御するものである電力増
幅方法。1. A power amplification method according to a linear amplification method, wherein a non-linear element is used to convert an input signal into two constant-amplitude signals obtained by converting amplitude fluctuations into phase information and then amplified, according to the amplitude of the input signal. A power amplification method for controlling the amplitude values of two constant amplitude signals by applying digital signal processing.
動を位相情報に変換した２つの定振幅信号に変換して増
幅する線形増幅方式による電力増幅方法において、 入力信号の包絡線の振幅に応じて、２つの定振幅信号の
振幅値を多段階に制御するものである電力増幅方法。2. A power amplification method using a linear amplification method, wherein a non-linear element is used to convert an input signal into two constant-amplitude signals obtained by converting amplitude fluctuations into phase information and then amplified. According to the power amplification method, the amplitude values of the two constant amplitude signals are controlled in multiple stages.
て、 入力信号の包絡線の振幅の瞬時値に応じて、２つの定振
幅信号の振幅値を多段階に制御するものである電力増幅
方法。3. The power amplification method according to claim 2, wherein the amplitude values of the two constant amplitude signals are controlled in multiple stages according to the instantaneous value of the amplitude of the envelope of the input signal. .
に記載の電力増幅方法において、 入力信号のピーク電力対平均電力比を検知し、該検知結
果に応じて前記多段階のレベルを制御するものである電
力増幅方法。4. The power amplification method according to claim 2, wherein the peak power to average power ratio of the input signal is detected, and the multi-step level is set according to the detection result. A power amplification method to control.
に記載の電力増幅方法において、 入力信号の振幅確率密度分布関数を検知し、該検知結果
に応じて前記多段階のレベルを制御するものである電力
増幅方法。5. The power amplification method according to claim 2, wherein an amplitude probability density distribution function of an input signal is detected, and the multi-step level is controlled according to the detection result. A method of power amplification that is to be.
動を位相情報に変換した２つの定振幅信号に変換して増
幅する線形増幅方式による電力増幅器において、 入力信号の包絡線の振幅を検出する検出手段と、 前記検出手段による検出結果に応じて、２つの定振幅信
号の振幅値を多段階に制御する振幅制御手段とを有する
電力増幅器。6. A power amplifier according to a linear amplification method, which uses a non-linear element to convert an input signal into two constant-amplitude signals in which amplitude fluctuations are converted into phase information and amplifies the detected amplitude, and detects the amplitude of the envelope of the input signal. And a amplitude control means for controlling the amplitude values of the two constant amplitude signals in multiple stages according to the detection result of the detection means.
出するものである電力増幅器。7. The power amplifier according to claim 6, wherein the detection means detects an instantaneous value of the amplitude of the envelope of the input signal.
に記載の電力増幅器において、さらに、 入力信号のピーク電力対平均電力比を検知する検知手段
と、 前記検知手段の検知結果に応じて、前記多段階のレベル
を制御する制御手段とを有する電力増幅器。8. The power amplifier according to claim 6, further comprising: a detection unit that detects a peak power to average power ratio of an input signal, and a detection result of the detection unit. And a control means for controlling the multi-step level.
に記載の電力増幅器において、さらに、 入力信号の振幅確率密度分布関数を検知する検知手段
と、 前記検知手段の検知結果に応じて、前記多段階のレベル
を制御する制御手段とを有する電力増幅器。9. The power amplifier according to claim 6, further comprising a detection unit that detects an amplitude probability density distribution function of an input signal, and a detection result of the detection unit. And a control means for controlling the multi-step level.
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|---|---|---|---|
| JP2002093517A JP2003298357A (en) | 2002-03-29 | 2002-03-29 | Power amplification method and power amplifier |
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| US8461924B2 (en) | 2007-06-19 | 2013-06-11 | Parkervision, Inc. | Systems and methods of RF power transmission, modulation, and amplification, including embodiments for controlling a transimpedance node |
| US8334722B2 (en) | 2007-06-28 | 2012-12-18 | Parkervision, Inc. | Systems and methods of RF power transmission, modulation and amplification |
| US8884694B2 (en) | 2007-06-28 | 2014-11-11 | Parkervision, Inc. | Systems and methods of RF power transmission, modulation, and amplification |
| JP5144671B2 (en) * | 2007-09-27 | 2013-02-13 | 京セラ株式会社 | Power amplifier circuit and transmitter and radio communication device using the same |
| JP5144672B2 (en) * | 2007-09-27 | 2013-02-13 | 京セラ株式会社 | Power amplifier circuit and transmitter and radio communication device using the same |
| JPWO2011024598A1 (en) * | 2009-08-27 | 2013-01-24 | 京セラ株式会社 | Power amplifier circuit and transmitter and communication device using the same |
| US8755454B2 (en) | 2011-06-02 | 2014-06-17 | Parkervision, Inc. | Antenna control |
| US10278131B2 (en) | 2013-09-17 | 2019-04-30 | Parkervision, Inc. | Method, apparatus and system for rendering an information bearing function of time |
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