Method of power amplifier calibration for an envelope tracking system
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United States of America Patent
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Apr 28, 2015
Grant Date -
Dec 6, 2012
app pub date -
Jun 1, 2012
filing date -
Jun 1, 2011
priority date (Note) -
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Abstract
A method for power amplifier (PA) calibration for an envelope tracking system of a wireless device is disclosed. The method involves measuring an output power of a PA that is a part under test (PUT) at a predetermined input power. Another step includes calculating a gain equal to the output power of the PA divided by the predetermined input power. A next step involves calculating a gain correction by subtracting the calculated gain from a desired gain. Other steps include determining an expected supply voltage for the PA at the desired gain using the gain correction applied to a nominal curve of gain versus PA supply voltage, and then storing the expected supply voltage for the PA versus input power in memory.
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