JP4646981B2 - 電流モード振幅変調のためのシステムおよび方法 - Google Patents
電流モード振幅変調のためのシステムおよび方法 Download PDFInfo
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Description
とにかく、その意図した使用に合う形式の制御信号を生成するように回路50を構成できることを理解すべきである。このように、制御信号は必要に応じてアナログまたはディジタルでよく、線形または非線形でよい。例えば図11は、補償信号を使用して、送信すべき信号の生成に関連するベースバンド送信プロセッサを制御できることを示す。より詳細には、送信プロセッサは、クリッピングを回避するために、電力増幅器の変調供給電流の生成に使用する振幅情報信号の振幅を抑制する(減じる)ように構成することができる。これに関して、制御回路50は、実際上送信信号プロセッサの一部を含むことができ、それにより検出回路48は、例えば検出回路48がクリッピングを回避するために抑制すべき時を送信信号プロセッサに知らせる指示として、送信信号プロセッサに検出信号を供給することを理解すべきである。
これにより、PAの直流電流IPAは、基準抵抗(固定かつ既知)のPAの直流抵抗(可変かつ未知)に対する比に比例して基準電流IREFを拡大縮小したバージョンである。PAの直流抵抗RPAの値の如何に関わらず、依然PAの直流電流の変調中は、PAの調整器の無歪限界および線形性は維持される。PAの直流電流は、変化するアンテナインピーダンスに応じて増減するので、不整合アンテナから出力される利用可能な電力は変化するが、PAの最大直流抵抗が無歪限界のクリッピング歪みを生じさせることはない。
上記の実施形態に留意して、図15は無線通信をサポートする例示的移動ネットワークを示す。移動ネットワークは一般に数字70により参照し、それぞれが受信/送信アンテナ74に付属する1局以上の基地局72と、1つ以上の外部ネットワーク78と基地局72をインタフェースさせる1つ以上の移動交換センタ(mobile switching centers、MCSs)76と、複数の移動端末100とを含む。移動端末100および幾つかの実施形態では、基地局72は、図2で紹介した増幅器回路10を任意のその幾つかの実施形態に都合良く組み込むことができる。
Claims (22)
- 変調供給電流の供給を受けるRF電力増幅器を含む送信機の動作を補償する方法であって、
振幅情報信号に応じて、前記RF電力増幅器の公称直流抵抗に相当する基準負荷への基準電流を変調し、前記基準電流を電流ミラー回路でミラーリングして前記変調供給電流を得ることにより、前記変調供給電流を、前記基準電流を拡大縮小したものとして生成する工程と、
電流ミラー回路電圧を検出することで前記RF電力増幅器の実効直流抵抗の変化を検出する工程と、
前記検出に応じて送信機動作を補償する工程と、を含み、
電流ミラー回路電圧を検出する工程は、電流ミラー回路の基準脚の第1のパストランジスタによる第1の電圧降下と、前記電流ミラー回路の出力脚の第2のパストランジスタによる第2の電圧降下とを比較する工程を含み、
前記第1のパストランジスタは前記基準負荷への前記基準電流を調整し、
前記第2のパストランジスタは前記RF電力増幅器への前記変調供給電流を調整する方法。 - 電流ミラー回路電圧を検出する工程は、前記電流ミラー回路の基準脚の第1のパストランジスタによる第1の電圧降下と、前記電流ミラー回路の出力脚の第2のパストランジスタによる第2の電圧降下とを比較することで、前記電流ミラー回路内の電圧不平衡を検出する工程を含む請求項1に記載の方法。
- 前記電圧不平衡が所定の閾値に達するまで前記送信機の動作の補償を遅らせる工程を更に備えることを特徴とする請求項2に記載の方法。
- 電流ミラー回路電圧を検出する工程は、前記RF電力増幅器の動作電圧が供給電圧限界に接近しつつあることを検出する工程を含む請求項1に記載の方法。
- 前記RF電力増幅器の動作電圧が供給電圧限界に接近しつつあることを検出する工程は、前記電流ミラー回路の出力脚の第2のパストランジスタによる電圧降下を検出する工程を含み、
前記第2のパストランジスタは、前記変調供給電流を前記RF電力増幅器に合わせて調整する請求項4に記載の方法。 - 前記検出に応じて送信機動作を補償する工程は、前記RF電力増幅器の前記実効直流抵抗をその公称値へ戻すために、前記送信機の1つ以上の動作パラメータを変更する工程を含む請求項1に記載の方法。
- 前記検出に応じて送信機動作を補償する工程は、前記RF電力増幅器の前記実効直流抵抗において検出した変化を補償するために、前記RF電力増幅器を送信アンテナに結合するインピーダンス整合回路を変更する工程を含む請求項1に記載の方法。
- 前記検出に応じて送信機動作を補償する工程は、前記RF電力増幅器の前記実効直流抵抗において検出した変化を補償するために、前記RF電力増幅器の実効デバイスサイズを変更する工程を含む請求項1に記載の方法。
- 前記検出に応じて送信機動作を補償する工程は、前記RF電力増幅器の前記実効直流抵抗において検出した変化を補償するために、前記RF電力増幅器の動作バイアスを変更する工程を含む請求項1に記載の方法。
- 前記検出に応じて送信機動作を補償する工程は、閉ループ制御下の前記第2のパストランジスタへの駆動信号を変更し、前記第2の電圧降下を前記第1の電圧降下に実質的に等しく維持する工程を含む請求項1に記載の方法。
- 送信機においてRF電力増幅器と共に使用するための電流変調回路であって、
振幅情報信号に応じて変調する基準電流のミラーリングに基づいて前記RF電力増幅器に変調供給電流を供給する電流ミラー回路と、
前記RF電力増幅器の実効直流抵抗の変化の検出に応じて検出信号を生成する検出回路と、
前記検出信号に応じて前記送信機を補償する制御回路と、を含み、
前記検出回路は、前記電流ミラー回路の基準脚における第1のパストランジスタによる第1の電圧降下と、前記電流ミラー回路の出力脚における第2のパストランジスタによる第2の電圧降下とを比較することにより前記RF電力増幅器の前記実効直流抵抗における変化を検出し、
前記第1のパストランジスタは前記基準負荷への前記基準電流を調整し、
前記第2のパストランジスタは前記RF電力増幅器への前記変調供給電流を調整する電流変調回路。 - 前記制御回路は、前記RF電力増幅器の前記実効直流抵抗の増加に応じて前記振幅情報信号を、前記検出信号により指示されるように削減するベースバンド送信信号生成器の一部を含む請求項11に記載の電流変調回路。
- 前記検出信号が閾値により権限を与えられ、前記検出信号が前記閾値に達するまで、前記制御回路は前記振幅情報信号を削減しない請求項12に記載の電流変調回路。
- 前記検出信号は、差分信号を前記閾値と比較することにより生成され、
前記差分信号は、前記基準電流から生じる基準電圧と前記変調供給電流から生じる出力電圧との差分に基づいて生成される請求項13に記載の電流変調回路。 - 前記検出回路は、前記基準電流および基準負荷に依存する基準電圧と、前記RF電力増幅器の前記変調供給電流および前記実効直流抵抗に依存する出力電圧との差分に基づいて検出信号を生成する請求項11に記載の電流変調回路。
- 前記制御回路は、前記RF電力増幅器をアンテナに結合しているインピーダンス整合回路を変更するように作用する補償信号を生成し、整合するインピーダンス値が、前記RF電力増幅器の前記実効直流抵抗において検出された変化の関数として変化する請求項15に記載の電流変調回路。
- 前記制御回路は、前記RF電力増幅器の実効デバイスサイズを変更するように動作する補償信号を生成するように構成され、前記RF電力増幅器の前記実効デバイスサイズが前記RF電力増幅器の前記実効直流抵抗において検出された変化の関数として変化する請求項15に記載の電流変調回路。
- 前記制御回路は、前記RF電力増幅器の動作バイアスを変更するように作用する補償信号を生成し、前記動作バイアスが前記RF電力増幅器の前記実効直流抵抗において検出された変化の関数として変化する請求項15に記載の電流変調回路。
- 前記検出回路は、前記電流ミラー回路の出力脚における電流ミラーリングトランジスタによる電圧差分の監視に基づいて前記RF電力増幅器の前記実効直流抵抗における変化を検出し、前記電圧差分の最小値が、前記RF電力増幅器の前記実効直流抵抗における増大により減少する請求項11に記載の電流変調回路。
- 前記制御回路は、前記検出信号が所定の閾値に達するまで、前記送信機の補償を遅らせる請求項11に記載の電流変調回路。
- 前記制御回路は、前記検出信号が送信実行時間中に生成されるように前記検出信号を監視し、その後の送信非実行時間中に前記送信機の前記検出信号による補償を更新する請求項11に記載の電流変調回路。
- 前記制御回路は、閉ループ制御下の前記第2のパストランジスタへの駆動信号を変更し、前記第2の電圧降下を前記第1の電圧降下に実質的に等しく維持することにより前記検出信号に応じて前記送信機を補償する請求項11に記載の電流変調回路。
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US10/889,567 US7333778B2 (en) | 2001-03-21 | 2004-07-12 | System and method for current-mode amplitude modulation |
PCT/US2005/024406 WO2006017202A1 (en) | 2004-07-12 | 2005-07-11 | System and method for current-mode amplitude modulation |
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EP1776753B1 (en) | 2013-05-15 |
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AU2005271920A1 (en) | 2006-02-16 |
CA2573862C (en) | 2014-09-09 |
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