APPARATUS AND METHODS FOR ENVELOPE TRACKING CALIBRATION

PROBLEM TO BE SOLVED: To provide a method of calibrating an envelope tracker having an envelope shaping table generated at a desired gain compression of a power amplifier.SOLUTION: The method includes generating a supply voltage for the power amplifier using the envelope tracker, supplying the suppl...

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Hauptverfasser: KEVIN LEE COBLEY, BENJAMIN BARTRAM, SABAH KHESBAK, HENSHAW ROBERT ASTLE, JULIAN HILDERSLEY, DAVID STEVEN RIPLEY, ROBERT JOHN THOMPSON
Format: Patent
Sprache:eng ; jpn
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Zusammenfassung:PROBLEM TO BE SOLVED: To provide a method of calibrating an envelope tracker having an envelope shaping table generated at a desired gain compression of a power amplifier.SOLUTION: The method includes generating a supply voltage for the power amplifier using the envelope tracker, supplying the supply voltage to the power amplifier at a first voltage level associated with substantially no gain compression of the power amplifier, and measuring an output power of the power amplifier at the first voltage level. The method further includes decreasing a voltage level of the supply voltage one or more times and measuring the output power at each voltage level, determining a second voltage level of the power amplifier associated with a gain compression equal approximately to the desired gain compression, and calibrating the envelope tracker on the basis of the determination.SELECTED DRAWING: Figure 8 【課題】電力増幅器の所望の利得圧縮で生成された包絡線整形テーブルを有する包絡線トラッカーを較正する方法を提供する。【解決手段】包絡線トラッカーを用いて電力増幅器用の供給電圧を生成すること、電力増幅器の実質的にゼロの利得圧縮に対応付けられる第1の電圧レベルで電力増幅器へ供給電圧を供給することおよび第1の電圧レベルでの電力増幅器の出力電力を測定することを含む。さらに、供給電圧の電圧レベルを1回以上減少させ、各電圧レベルでの出力電力を測定すること、所望の利得圧縮とほぼ等しい利得圧縮に対応付けられる電力増幅器の第2の電圧レベルを決定することおよび決定に基づき包絡線トラッカーを較正することを含む。【選択図】図8