Radio frequency power amplifier and method using a plurality of feedback systems
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United States of America Patent
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app pub date -
Apr 28, 2006
filing date -
Mar 25, 2005
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Abandoned
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Abstract
A radio frequency power amplifier and corresponding methods are arranged and configured to drive a resonant load with an output signal that includes AM or complex modulation from an input signal. The amplifier includes: a radio frequency switching stage with an output that is coupled to a resonant circuit and configured to provide the output signal when powered from a fixed voltage power supply; a feedback control system, coupled to the input signal and the output signal, and further comprising a sequencer configured to provide a sequencer output that is used to drive the radio frequency switching stage; and a second feedback system responsive to the sequencer output and configured to provide a second feedback signal that is coupled to the feedback control system, where the sequencer output has an OFF state that begins at a variable time corresponding to the input signal, the output signal, and the second feedback signal.
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