JP2005020696A - マルチモード増幅システム - Google Patents
マルチモード増幅システム Download PDFInfo
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
- H03F1/0211—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the supply voltage or current
- H03F1/0216—Continuous control
- H03F1/0222—Continuous control by using a signal derived from the input signal
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
- H03F1/0211—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the supply voltage or current
- H03F1/0244—Stepped control
- H03F1/025—Stepped control by using a signal derived from the input signal
-
- 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
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
- H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/331—Sigma delta modulation being used in an amplifying circuit
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- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Amplifiers (AREA)
Abstract
【解決手段】モードセレクタ16は、入力信号が2つのスレショルドレベルTL1、TL2よりも低い場合は線形モードで、高い場合は極性モードで、中間の場合はエンベロープ追跡モードで動作するよう、増幅器22のモードを制御する。モード選択のため、エンベロープ追跡モードでは振幅変調した信号に可変ヘッドルーム電圧を加えたものを増幅器22の電源供給端子に供給し、極性モードでは振幅変調した信号と位相変調した入力信号とを電源供給端子へ供給し、線形モードでは一定振幅の信号を電源供給端子へ供給する。
【選択図】図1
Description
A(t)cos(ωc(t)+φ(t))
但し、A(t)は振幅変調した成分であり、cos(ωc(t)+φ(t))は位相変調した成分で、φ(t)は位相成分であり、ωc(t)は搬送波周波数である。入力信号は、広範囲の種々の振幅及び(又は)位相変調した形態としうる。前述の式は、単一搬送波入力信号の極性表現を示し、実際の信号は多重搬送波(マルチキャリヤ)信号でありうる。多重搬送波の場合、前記の式も有効であるが、その場合、ωcは、存在する搬送波の加重平均である仮想搬送波周波数を表わす。
Claims (10)
- 増幅システムにおいて、
入力信号を増幅する電力増幅器であって、入力端子と電源供給端子とを有する増幅器と、
入力信号の特性に基づいて、選択された入力信号を前記入力端子に供給し、かつ選択された電源供給信号を前記電源供給端子に提供することによって、前記増幅システムの動作を、エンベロープ追跡モード、極性モード及び線形モードの間で制御するモードセレクタと
を含むことを特徴とする増幅システム。 - 請求項1記載の増幅システムにおいて、該増幅システムは、低レベルの入力信号に対しては線形モードで、ピークレベルの入力信号に対しては極性モードで、前記低レベル及びピークレベルの中間レベルの入力信号に対してはエンベロープ追跡モードで動作することを特徴とする増幅システム。
- 請求項1記載の増幅システムにおいて、前記モードセレクタは、
線形モードで動作中、前記入力端子にコンポジット信号成分を、前記電源供給端子にほぼ一定のエンベロープ信号成分を提供し、
エンベロープ追跡モードで動作中、前記入力端子にはコンポジット信号成分を、前記電源供給端子には可変振幅信号を提供し、
極性モードで動作中、前記入力端子には前記入力信号の位相変調した信号成分を、前記電源供給端子には前記入力信号の振幅変調した信号成分を提供する
ことを特徴とする増幅システム。 - 請求項1記載の増幅システムにおいて、前記モードセレクタは、
第1のデジタル−アナログ変換器(DAC)を介して前記入力端子に結合された第1の出力側と、第2のDACを介して前記電源供給端子に結合された第2の出力側とを有しており、
増幅器の入力端子への入力信号のデジタル表現と増幅器の電源供給端子への電源供給信号のデジタル表現とをそれぞれ第1及び第2のDACへ供給し、これらDACによってこれらデジタル表現をアナログ信号に変換することを特徴とする増幅システム。 - 請求項4記載の増幅システムにおいて、前記第1及び第2のDACの少なくとも一方がデルタ−シグマ(Δ−Σ)DACからなり、これにより、増幅器の入力信号成分と電源供給信号成分との少なくとも一方のデジタル表現が、所望の無線通信周波数でアナログドメインに直接変換されることを特徴とする増幅システム。
- 請求項1記載の増幅システムにおいて、該システムはさらに、前記増幅器の出力歪みを緩和するために、前記入力端子及び電源供給端子へのデジタルドメインの信号の少なくとも一方を変調してプレディストーションを行う予歪要素を含むことを特徴とする増幅システム。
- 請求項1記載の増幅システムにおいて、該システムはさらに、該システムの所望する出力信号に対応する基準信号を発生させるデジタル交差消去要素を含み、前記基準信号は、エラー信号を検出するために前記増幅器からの出力信号の一部と組み合わされ、前記エラー信号は、最終の出力信号を発生させるために、反転されかつ前記増幅器の出力信号を遅延させた信号と組み合わされることを特徴とする増幅システム。
- 請求項1記載の増幅システムにおいて、該システムはさらに、前記増幅器の出力歪みを緩和するために、前記入力端子及び電源供給端子へのデジタルドメインの信号の少なくとも一方を変調する予歪要素と、前記増幅システムの所望の出力信号に対応する基準信号を発生させるデジタル交差消去要素とを含み、前記基準信号は、エラー信号を検出するために前記増幅器からの出力信号の一部と組み合わされ、前記エラー信号は、最終の出力信号を発生させるために、反転されかつ前記増幅器の出力信号を遅延させた信号と組み合わされることを特徴とする増幅システム。
- 請求項8記載の増幅システムにおいて、該システムはさらに、入力信号からピーク信号をクリップ及び除去の少なくとも一方を実行するピーク−平均リダクション(PAR)要素を含み、デジタル交差消去要素が最終の出力信号へ修正信号を提供することを特徴とする増幅システム。
- 請求項1記載の増幅システムにおいて、前記モードセレクタは、許容ヘッドルームを有する電源供給信号を発生させるために、エンベロープ追跡モードにおいて、増幅器の入力信号及び電源供給信号を遅延させるよう構成されていることを特徴とする増幅システム。
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US10/603,880 US7043213B2 (en) | 2003-06-24 | 2003-06-24 | Multi-mode amplifier system |
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JP2005020696A true JP2005020696A (ja) | 2005-01-20 |
JP4509538B2 JP4509538B2 (ja) | 2010-07-21 |
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JP2003385351A Expired - Lifetime JP4509538B2 (ja) | 2003-06-24 | 2003-11-14 | マルチモード増幅システム |
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US20040266366A1 (en) | 2004-12-30 |
US7043213B2 (en) | 2006-05-09 |
EP1492227A1 (en) | 2004-12-29 |
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