Quadrature power amplifier architecture
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United States of America Patent
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Aug 6, 2013
Grant Date -
Apr 26, 2012
app pub date -
Apr 20, 2011
filing date -
Apr 20, 2011
priority date (Note) -
Withdrawn
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Abstract
The present disclosure relates to a quadrature RF power amplifier (PA) architecture that uses a single-ended interface to couple a non-quadrature PA path to a quadrature PA path, which may be coupled to an antenna via an antenna port. The quadrature nature of the quadrature PA path provides tolerance for changes in antenna loading conditions. An RF splitter in the quadrature PA path presents a relatively stable input impedance, which is predominantly resistive, to the non-quadrature PA path over a wide frequency range, thereby substantially isolating the non-quadrature PA path from changes in the antenna loading conditions. Further, the input impedance substantially establishes a load line slope of a feeder PA stage in the non-quadrature PA path, thereby simplifying the quadrature RF PA architecture. One embodiment of the quadrature RF PA architecture uses two separate PA paths, either of which may incorporate a combined non-quadrature and quadrature PA architecture.
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