Quadrature power amplifier having increased efficiency
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United States of America Patent
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Aug 11, 2015
Grant Date -
Oct 9, 2014
app pub date -
Apr 3, 2013
filing date -
Apr 3, 2013
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Abstract
A method and system for achieving increased efficiency in a quadrature modulated power amplifier (11) are disclosed. In some embodiments, a supply path (36, 40) and a gain path (38, 42) are provided in each of an I-channel and a Q-channel. The supply path (36, 40) produces a variable voltage and the gain path (38, 42) produces a gain control signal. The variable voltage and gain control signal are used by a variable gain power amplifier (44, 46) to modulate a local oscillator signal to produce a modulated radio signal.
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