Power amplifier system with supply modulation mitigation circuitry and methods
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United States of America Patent
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Mar 22, 2016
Grant Date -
Sep 18, 2014
app pub date -
Mar 17, 2014
filing date -
Mar 15, 2013
priority date (Note) -
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Abstract
A power amplifier system with supply modulation mitigation circuitry and methods is disclosed. The power amplifier system includes a regulator having an unregulated input and a regulated output along with a power amplifier having a supply input for receiving a supply current from the regulated output and having a signal input and a signal output that comprise a main signal path. The supply modulation mitigation circuitry is adapted to sense a supply modulation signal output from the regulator, generate a cancellation signal that is a scaled inverse of the supply modulation signal, and inject the cancellation signal into a node within the power amplifier system to sum the supply modulation signal and cancellation signal together to reduce the supply modulation signal from within the main signal path.
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