JP2008518514A - ベクトル電力増幅のためのシステムおよび方法 - Google Patents
ベクトル電力増幅のためのシステムおよび方法 Download PDFInfo
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Abstract
Description
1.序論
1.1.時間変化複素包絡線入力信号の生成例
1.2.一定の包絡線信号からの時間変化複素包絡線信号の生成例
1.3.ベクトル電力増幅の概要
2.一般的な数学的概要
2.1.フェーザー(Phasor)信号表現
2.2.時間変化複素包絡線信号
2.3.時間変化包絡線信号の一定包絡線分解
3.ベクトル電力増幅(VPA)方法およびシステム
3.1.カルテシアン4ブランチ・ベクトル電力増幅器
3.2.カルテシアン極カーテシアン極(CPCP)2ブランチ・ベクトル電力増幅器
3.3.直接カルテシアン2ブランチ・ベクトル電力増幅器
3.4.ベクトル変調器へのIおよびQのデータの伝達機能(Transfer Function)
3.4.1.カルテシアン4ブランチVPA伝達機能
3.4.2.CPCP2ブランチVPA伝達機能
3.4.3.直接カルテシアン2ブランチVPA伝達機能
3.4.4.振幅から位相シフトへの変換
3.4.4.1.正弦信号に関する振幅から位相シフトへの変換
3.4.4.2.方形波信号に関する振幅から位相シフトへの変換
3.4.5.波形歪み補償
3.5.出力ステージ
3.5.1.出力ステージ実施形態
3.5.2.出力ステージ電流整形
3.5.3.出力ステージ保護
3.6.高調波制御
3.7.電力制御
3.8.例示的なベクトル電力増幅器実施形態
4.要約
5.結論
ベクトル合成電力増幅のための方法、装置、およびシステムが、本明細書で開示される。
図1Aおよび図1Bは、時間変化包絡線および位相複素入力信号の生成を説明する例である。図1Aでは、時間変化包絡線搬送波信号104、106が、位相コントローラ110に入力される。位相コントローラ110は、信号104、106の位相成分を操作する。言い換えると、位相コントローラ110は、信号104、106を位相シフトすることができる。したがって、結果の信号108、112は、信号104、106に対して位相シフトされていることになる。図1Aの例では、信号108、112から分かるように、位相コントローラ110は、時刻刻t0に、信号104、106において位相反転(180度位相シフト)を引き起こす。信号108、112は、時間変化複素搬送波信号を表す。信号108、112は、時間変化包絡線および位相成分の両方を有する。信号108、112は、合算されると、信号114をもたらす。信号114も、時間変化複素信号を表す。信号114は、本発明のVPA実施形態への入力信号例(例えば、図50のステップ504への入力例)とすることができる。
このセクションの説明は、一般に、図50のステップ508の動作に関する。図1Cは、時間変化複素信号の、2つ以上の実質的に一定の包絡線信号の和からの生成についての3つの例を説明する。しかし、本明細書で提供される教示に基づいて、図1Cの例で説明される概念が、2つ以上の一定包絡線信号の場合にも同様に拡張され得ることは、当業者であれば理解されよう。
ベクトル電力増幅の高水準の概要が、今から提供される。図1Dは、例示的な時間変化複素入力信号172の電力増幅を示している。図1Aおよび図1Bで説明されたような信号114および126は、信号172の例とすることができる。さらに、信号172は、104および106(図1A)、108および112(図1A)、116および118(図1B)、ならびに122および124(図1B)など、2つ以上の構成要素信号によって生成されることができ、または2つ以上の成分信号から構成されることができる。
2.1)フェーザー信号表現
図1は、信号r(t)のフェーザー表現
r(t)=I(t)・cos(ωt)+Q(t)・sin(ωt)=
R(t)・cos(φ(t))・cos(ωt)+R(t)・sin(φ(t))・sin(ωt) (1)
図1の例では、R(t)は、特定の時刻において示されていることに留意されたい。
図2は、2つの異なる時刻t1およびt2における、信号r(t)のフェーザー表現を示している。信号の包絡線の振幅で表されるフェーザーの大きさおよびその相対位相シフトはともに、時間t1から時間t2にかけて変化する。図2では、これは、フェーザー
大きさおよび位相が時間変化する任意のフェーザーは、基準フェーザーに対して適切に指定された位相シフトを有する、2つ以上の一定の大きさのフェーザーの合算によって、獲得されることができる。
本発明の実施形態によるベクトル電力増幅方法およびシステムは、任意の時間変化包絡線信号を2つ以上の実質的に一定の包絡線構成要素信号に分解する能力、またはそのような構成要素信号を受け取りもしくは生成し、構成要素信号を増幅し、その後、増幅された信号を合算して、時間変化複素包絡線信号の増幅バージョン(amplified version)を生成する能力に依存する。
限定のためではなく説明を容易にするために本明細書でカルテシアン4ブランチ(Cartesian 4-Branch)VPA実施形態と呼ばれる、本発明の一実施形態によれば、時間変化複素包絡線信号は、4つの実質的に一定の包絡線構成要素信号に分解される。構成要素信号は、等しくまたは実質的に等しく個別に増幅され、その後、元の時間変化複素包絡線信号の増幅バージョンを構成するために合算される。
カルテシアン極カルテシアン極(CPCP:Cartesian-Polar-Cartesian-Polar)2ブランチVPA実施形態が、今から説明される(この実施形態の名称は、限定のためではなく説明を容易にするために提供される)。
r’(t)=U’(t)+L’(t);
U’(t)=Ccos(ωt)+αsin(ωt); (10)
L’(t)=Ccos(ωt)−βsin(ωt);
と書き直され得ることがさらに確認されることができ、ここで、Cはフェーザー
rout(t)=U(t)+L(t);
U(t)=K[Ccos(ωt+θ)+αsin(ωt+θ)]; (12)
L(t)=K[Ccos(ωt+θ)−βsin(ωt+θ)]
と示されることができ、ここで、rout(t)は、フェーザー
直接カルテシアン2ブランチ(Direct Cartesian 2-Branch)VPA実施形態が、今から説明される。この名称は、本明細書では参照目的で使用され、機能的または構造的に限定するものではない。
r’(t)=U’(t)+L’(t);
U’(t)=C×cos(ωt)+α×sin(ωt); (14)
L’(t)=C×cos(ωt)−β×sin(ωt);
ここで、Cはフェーザー
U(t)=Uxφ1(t)+Uyφ2(t);
L(t)=Lxφ1(t)+Lyφ2(t); (19)
であり、ここで、φ1(t)およびφ2(t)は、適切に選択された直交基底関数を表す。
上で説明された実施形態のいくつかにおいて、受け取られたIおよびQのデータを、ベクトル変調および増幅の後続ステージのための振幅情報入力に変換する、IおよびQのデータ伝達機能が提供された。例えば、図17の実施形態では、IおよびQのデータ伝達機能モジュール1716は、IおよびQの情報信号1710を処理して、信号r(t)の第1および第2の一定包絡線構成要素1754および1756の同相および直交振幅情報信号1720、1722、1724、1726を生成する。その後、ベクトル変調器1750および1752は、生成された振幅情報信号1720、1722、1724、1726を利用して、第1および第2の一定包絡線構成要素信号1754および1756を生成する。その他の例は、図7、図8、図12、および図13のモジュール710、712、1216を含む。これらのモジュールは、Iおよび/またはQデータを、ベクトル変調および増幅という後続ステージのための振幅情報入力に変換するために、伝達機能を実装する。
図19は、カルテシアン4ブランチVPA実施形態によるIおよびQの伝達機能実施形態例を示すプロセス・フローチャート1900である。プロセスは、同相データ成分および直交データ成分を受け取ることを含む、ステップ1910で開始する。例えば、図7Aのカルテシアン4ブランチVPA実施形態では、これは、I情報信号702を受け取るIデータ伝達機能モジュール710、およびQ情報信号704を受け取るQデータ伝達機能モジュール712によって示されている。図7Aの実施形態では、Iデータ伝達機能モジュール710およびQデータ伝達機能モジュール712が別々の構成要素として示されていることに留意されたい。しかし、実装によって、IおよびQデータ伝達機能モジュール710および712は、別々でもよく、または単一モジュールに組み合わされてもよい。
図21は、CPCP2ブランチVPA実施形態によるIおよびQ伝達機能の実施形態例を示すプロセス・フローチャート2100である。プロセスは、ベースバンド信号の同相(I)および直交(Q)データ成分を受け取ることを含む、ステップ2110で開始する。例えば、図12のCPCP2ブランチVPA実施形態では、これは、IおよびQ情報信号1210を受け取るIおよびQデータ伝達機能モジュール1216によって示されている。
図23は、直接カルテシアン2ブランチVPA実施形態によるIおよびQ伝達機能の実施形態例を示すプロセス・フローチャート2300である。プロセスは、ベースバンド信号の同相(I)および直交(Q)データ成分を受け取ることを含む、ステップ2310で開始する。例えば、図17の直接カルテシアン2ブランチVPA実施形態では、これは、IおよびQ情報信号1710を受け取るIおよびQデータ伝達機能モジュール1716によって示されている。
図20のf(|I|)、f(|Q|)、ならびに図22および図24のf(|R|)の実施形態が、今からさらに説明される。
時間変化複素包絡線の正弦波信号r(t)について考察する。時間領域では、この信号は、R(t)が、時刻tにおける信号の包絡線振幅を表し、δ(t)が、時刻tにおける信号の位相シフト角を表し、ωが、秒当たりのラジアンを単位とする信号の周波数を表すとすると、
r(t)=R(t)sin(ωt+δ(t)) (20)
と表現されることができる。
R(t)sin((ωt+δ(t))=Asin(ωt)+Asin(ωt+φ(t)) (21)
と示されることができる。位相シフト角φ(t)は、以下の説明ではR(t)の関数として導き出される。これは、正弦信号に関する振幅から位相シフトへの変換に等価である。
R(t)sin((ωt+δ(t))=Asin(ωt)+Asin(ωt)cosφ(t)+Asin(φ(t))cos ωt;
⇒R(t)sin((ωt+δ(t))=Asin(φ(t))cos ωt+A(1+cosφ(t))sin ωt (22)
と書き直されることができる。
図28は、本発明の実施形態による2つの一定包絡線方形波信号の合成を示している。図28では、信号2810および2820は、周期T、デューティ・サイクルγT(0<γ<l)をもち、それぞれ包絡線振幅A1およびA2をもつ、一定包絡線信号である。
R=A1×A2×(γT−t’) (25)
によって与えられることに留意されたい。
ある種の実施形態では、振幅から位相シフトへの変換は、理論的または実際的に導出される際に、正確には実装されない可能性がある。実際、最適な動作のために導出される変換についての調整または調節を必要とする複数の要因が存在することがある。波形歪み補償は、振幅から位相シフトへの変換についての調整または調節を必要とすることがある1つの要因である。波形歪み補償が今から以下で説明される。
本発明の実施形態の一態様は、ベクトル電力増幅器(VPA)の出力ステージで構成要素信号を合算することに存する。これは、例えば、図7でPA770、772、774、776の出力が合算されている。これは、例えば、図8、図12、図13、図17、および図18にも同様に示されている。VPAの出力を合成するための様々な実施形態が、本明細書で説明される。以下はVPAの文脈で説明されるが、以下の教示が一般に、任意の応用例の任意の能動デバイスの出力の結合または合算に当てはまることを理解されたい。
図30は、本発明の一実施形態による電力増幅器(PA)出力ステージ実施形態3000を示すブロック図である。出力ステージ実施形態3000は、複数のPAブランチ3005−{1,...,n}を含む。それぞれのベクトル変調器から来る信号3010−{1,...,n}は、出力ステージ3000用の入力を表す。本発明のこの実施形態によれば、信号3010−{1,...,n}は、電力増幅器の所望する出力信号についての等しくかつ一定の、または実質的に等しくかつ一定の包絡線構成要素信号を表す。
本発明による、出力ステージならびにオプションのプレ・ドライバおよびドライバ・ステージの、バイアスおよび電流制御技法が、以下で説明される。ある種の実施形態では、出力ステージ電流制御機能は、ベクトル電力増幅器(VPA)実施形態の出力ステージ効率を高めるために利用される。その他の実施形態では、出力ステージ電流制御は、セクション3.5.3でさらに説明される、過剰電圧および電流からの出力ステージ保護を提供するために使用される。実施形態では、出力ステージ電流制御機能は、図33を参照して上で説明されたオートバイアス・モジュールを使用して実行される。これらの電流制御機能を実行する際のオートバイアス・モジュールの動作の説明も、本発明の一実施形態により以下で提示される。
上で説明されたように、本発明の実施形態による出力ステージ実施形態は、合成またはアイソレーション要素を使用せずにPAステージで出力を直接結合できることの結果として、非常に電力効率がよい。しかし、ある種の環境および/または応用例におけるある種の出力ステージ実施形態は、そのような直接結合手法に耐えるために、追加の特別な出力ステージ保護手段を必要とすることがある。これは、例えば、図51Dおよび51Eに示される5110D、5120D、5130D、5160D、5150E、5160E、5170E、および5180Eなどの出力ステージ実施形態の場合とすることができる。一般に、5140D、5150D、5110E、5120E、5130E、および5140Eなどの相補的な出力ステージ実施形態は、本明細書のこのセクションで説明されるのと同じ出力ステージ保護手段を(任意選択的に使用することはできるが)必要としない。出力ステージ保護手段およびそのような手段をサポートする実施形態が今から提供される。
本発明の実施形態によれば、各ブランチPAの基礎原理は、出力スペクトルの基本波への電力伝達を最大化することである。一般に、各ブランチPAは、高調波が豊富な出力スペクトルを生じさせる複数ステージとすることができる。一態様では、基本波に関して、実電力伝達が最大化される。別の態様では、非基本波に関して、実電力伝達が最小化され、一方、虚電力伝達は許容されることができる。本発明の実施形態による高調波制御は、様々な方法で実行されることができる。
本発明のベクトル電力増幅実施形態は本質的に、出力電力制御を実行するための機構を提供する。
図47は、本発明によるベクトル電力増幅器の例示的な一実施形態4700を示している。実施形態4700は、直接カルテシアン2ブランチVPA方法によって実装されている。
電力増幅およびアップ・コンバージョンを提供するために信号を処理することについての新しい概念についての数学的基礎が本明細書で提供された。これらの新しい概念は、本質的に包絡線が実質的に一定の波形の和から任意の波形が構成されることを可能にする。所望する出力信号および波形は、所望する出力信号の複素包絡線の知識から生成され得る、実質的に一定の包絡線構成要素信号から構成されることができる。構成要素信号は、市販されておらず、文献または関連技術で教示または見出されていない、新しい独特な新規の技法を使用して合算される。さらに、本開示で提供された様々な技法および回路の混合が、現在提供されるものと比較された場合に優れた線形性、電力追加効率、モノリシック実装、および低コストを可能にする、本発明の独特な態様を提供する。加えて、本発明の実施形態は、本質的にプロセスおよび温度変動に対して感受性がより低い。ある種の実施形態は、本明細書で説明された複数入力単一出力増幅器の使用を含む。
本発明が、特定機能の実行およびそれらの関係を示す機能構築ブロックを活用して上で説明された。これらの機能構築ブロックの境界は、説明の便宜上、本明細書では恣意的に定義された。特定機能およびそれらの関係が適切に実行される限り、代替の境界も定義されることができる。したがって、そのような代替の境界はどれも、特許請求される本発明の範囲および主旨の範囲内にある。これらの機能構築ブロックが、離散構成要素、特定用途向け集積回路、適切なソフトウェアを実行するプロセッサなど、およびそれらの組合せによって実装され得ることを、当業者であれば理解されよう。
Claims (24)
- ベースバンド信号を増幅し周波数アップ・コンバートする方法であって、
1)所望する出力周波数に対応する周波数の入力クロックを受け取るステップ、
2)前記所望する出力周波数のベースバンド同相(Iベクトル)の包絡線および位相情報を独立に増幅するステップ、
3)前記所望する出力周波数のベースバンド直交(Qベクトル)の包絡線および位相情報を独立に増幅するステップ、および
4)前記増幅されたベースバンド同相情報および直交情報を合算して、前記所望する出力周波数で所望する波形を生成するステップ
を備えることを特徴とする方法。 - 前記ステップ4)は、出力ステージの直接結合によって達成されることを特徴とする請求項1に記載の方法。
- 前記ステップ2)〜4)は、複数入力単一出力増幅器を使用して達成されることを特徴とする請求項1に記載の方法。
- ベースバンド信号を増幅し周波数アップ・コンバートする方法であって、
1)所望する出力周波数に対応する周波数の入力クロックを受け取るステップ、
2)前記所望する出力周波数のベースバンド同相(Iベクトル)包絡線および位相情報を独立に非線形増幅するステップ、
3)前記所の望出力周波数のベースバンド直交(Qベクトル)包絡線および位相情報を独立に非線形増幅するステップ、および
4)前記非線形増幅されたベースバンド同相情報および直交情報を合算して、前記所望する出力周波数で所望する線形波形を生成するステップ
を備えることを特徴とする方法。 - 前記ステップ4)は、出力ステージの直接結合を介して達成されることを特徴とする請求項4に記載の方法。
- 前記ステップ2)〜4)は、複数入力単一出力増幅器を使用して達成されることを特徴とする請求項4に記載の方法。
- ベースバンド信号を増幅し、周波数アップ・コンバートする方法であって、
1)所望する出力周波数に対応する周波数の入力クロックを受け取るステップ、
2)2つ以上の非線形信号の間の位相関係を制御して、ベースバンド同相(Iベクトル)包絡線情報を増幅するステップ、
3)2つ以上の非線形信号の間の位相関係を制御して、ベースバンド直交(Qベクトル)包絡線情報を増幅するステップ、および
4)前記非線形増幅されたベースバンド同相情報および直交情報を合算して、前記所望する出力周波数で所望する線形波形を生成するステップ
を備えることを特徴とする方法。 - 前記ステップ4)は、出力ステージの直接結合を介して達成されることを特徴とする請求項7に記載の方法。
- 前記ステップ2)〜4)は、複数入力単一出力増幅器を使用して達成されることを特徴とする請求項7に記載の方法。
- ベースバンド信号を増幅し、周波数アップ・コンバートする方法であって、
1)所望する出力周波数に対応する周波数の入力クロックを受け取るステップ、
2)2つ以上の信号の間の位相関係を制御して、ベースバンド同相(Iベクトル)包絡線情報を増幅するステップ、
3)2つ以上の信号の間の位相関係を制御して、ベースバンド直交(Qベクトル)包絡線情報を増幅するステップ、および
4)前記増幅されたベースバンド同相情報および直交情報を合算して、前記所望する出力周波数で所望する線形波形を生成するステップ
を備えることを特徴とする方法。 - 前記ステップ4)は、出力ステージの直接結合を介して達成されることを特徴とする請求項10に記載の方法。
- 前記ステップ2)〜4)は、複数入力単一出力増幅器を使用して達成されることを特徴とする請求項10に記載の方法。
- ベースバンド信号を増幅し、周波数アップ・コンバートする方法であって、
1)所望する出力周波数に対応する周波数の入力クロックを受け取るステップ、
2)前記所望する出力周波数のベースバンド同相(Iベクトル)包絡線情報を独立に増幅するステップ、
3)前記所望する出力周波数のベースバンド直交(Qベクトル)包絡線情報を独立に増幅するステップ、および
4)前記増幅されたベースバンド同相情報および直交情報を互いに直交するように合算して、前記所望する出力周波数で所望する波形を生成するステップ
を備えることを特徴とする方法。 - 前記ステップ4)は、出力ステージの直接結合を介して達成されることを特徴とする請求項13に記載の方法。
- 前記ステップ2)〜4)は、複数入力単一出力増幅器を使用して達成されることを特徴とする請求項13に記載の方法。
- ベースバンド信号を増幅し、周波数アップ・コンバートする方法であって、
1)所望する出力周波数に対応する周波数の入力クロックを受け取ること、
2)同相および直交ベースバンド信号を正規化して相対位相角を決定するステップ、
3)同相および直交ベースバンド信号の大きさを決定するステップ、
4)2つ以上の実質的に一定の包絡線信号を生成するステップ、
5)前記2つ以上の実質的に一定の包絡線信号を増幅するステップ、および
6)前記増幅された2つ以上の実質的に一定の包絡線信号を合算することによって、ステップ2)の前記相対位相角およびステップ3)の大きさ情報を処理して所望する波形を生成するステップ
を備えることを特徴とする方法。 - 前記ステップ6)は、出力ステージの直接結合を介して達成されることを特徴とする請求項16に記載の方法。
- 前記ステップ5)および6)は、複数入力単一出力増幅器を使用して達成されることを特徴とする請求項16に記載の方法。
- ベースバンド信号を増幅し、周波数アップ・コンバートする方法であって、
1)所望する出力周波数に対応する周波数の入力クロックを受け取るステップ、
2)同相および直交ベースバンド情報を受け取るステップ、
3)ステップ2)の前記情報から導き出される2つ以上の実質的に一定の包絡線信号を生成するステップ、
4)前記2つ以上の実質的に一定の包絡線信号を増幅するステップ、および
5)前記増幅された2つ以上の実質的に一定の包絡線信号を合算して、所望する波形を生成するステップ
を備えることを特徴とする方法。 - 前記ステップ5)は、出力ステージの直接結合を介して達成されることを特徴とする請求項19に記載の方法。
- 前記ステップ4)および5)は、複数入力単一出力増幅器を使用して達成されることを特徴とする請求項19に記載の方法。
- ベースバンド信号を増幅し、周波数アップ・コンバートする方法であって、
1)無線周波搬送波信号を受信するステップ、
2)前記無線周波搬送波信号を復調して、同相および直交ベースバンド情報を生成するステップ、
3)所望する出力周波数に対応する周波数の入力クロックを受け取るステップ、
4)前記ステップ2)の前記情報から導き出される2つ以上の実質的に一定の包絡線信号を生成するステップ、
5)前記2つ以上の実質的に一定の包絡線信号を増幅すること、および
6)前記増幅された2つ以上の実質的に一定の包絡線信号を合算して、所望する波形を生成するステップ
を備えることを特徴とする方法。 - 前記ステップ6)は、出力ステージの直接結合を介して達成されることを特徴とする請求項22に記載の方法。
- 前記ステップ5)および6)は、複数入力単一出力増幅器を使用して達成されることを特徴とする請求項22に記載の方法。
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WO2010074069A1 (ja) * | 2008-12-24 | 2010-07-01 | 京セラ株式会社 | 加算回路およびそれを用いた電力増幅回路ならびにそれを用いた送信装置および通信装置 |
JP2010153967A (ja) * | 2008-12-24 | 2010-07-08 | Kyocera Corp | 加算回路およびそれを用いた電力増幅回路ならびにそれを用いた送信装置および通信装置 |
US8351881B2 (en) | 2008-12-24 | 2013-01-08 | Kyocera Corporation | Addition circuit, power amplifier circuit using same, and transmission device and communication device using the power amplifier circuit |
JP2013121139A (ja) * | 2011-12-08 | 2013-06-17 | Fujitsu Ltd | 増幅器 |
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US9263999B2 (en) | 2012-08-20 | 2016-02-16 | Fujitsu Limited | LINC power amplifier |
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