Closed loop active cancellation technique (ACT)-based RF power amplifier linearization architecture
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United States of America Patent
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-
Sep 17, 2002
Grant Date -
Jul 4, 2002
app pub date -
Dec 20, 2001
filing date -
Dec 29, 2000
priority date (Note) -
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Abstract
A closed loop, active cancellation technique (ACT)-based RF power amplifier linearization architecture injects a pilot tone as a `pseudo distortion` signal into signal paths through first and second matched RF amplifiers, and a set of power minimization loops are closed around the RF amplifier pair. The power minimizing control loops control a set of vector modulators such that both the injected pilot tone and intermodulation distortion products are canceled, while RF carrier components constructively sum in the composite output of the two RF amplifiers.
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