| 摘要 |
A method and apparatus for efficient power amplification of a wideband signal with a correspondingly wide modulation bandwidth includes an envelope detector (220), an envelope amplifier (270), a driver amplifier (250), and a power amplifier (260). The driver amplifier (250) includes a dual gate variable gain amplifier (252) that has a substantially constant phase characteristic over a wide dynamic range. The power amplifier (260) is modulated by an amplified envelope signal from the envelope amplifier (270), and is driven by an output of the driver amplifier (250). The operation of the cascaded driver amplifier (250) and power amplifier (260) allow the power amplifier (260) to operate a substantially constant compression point, and reduced distortion.
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