Integrated linear power detection in an RF power amplifier
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United States of America Patent
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Nov 27, 2012
Grant Date -
Dec 22, 2011
app pub date -
Nov 15, 2010
filing date -
Jun 18, 2010
priority date (Note) -
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Abstract
A radio frequency (RF) power amplifier system having a power detection feature includes a balanced power amplifier, an in-phase branch current detector, an out-of-phase branch current detector, and detection circuitry. The balanced power amplifier includes a phase splitter, an in-phase power amplifier branch, an out-of-phase power amplifier branch, and a phase combiner. The in-phase branch current detector provides an indication of current in the in-phase power amplifier branch. The out-of-phase branch current detector provides an indication of current in the out-of-phase power amplifier branch. The detection circuitry combines the indications of current in the in-phase and out-of-phase power amplifier branches to produce an indication of current in the balanced power amplifier.
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