Patent ID: 7463092
Filing Date: 2008-12-09
Classification: H03G

Abstract:
1. A radio frequency (RF) amplifier, comprising: an amplitude detector; an RF drive adjust circuit adapted to receive an input signal and to adjust at least one of the amplitude and phase thereof in response to a first control signal to produce a drive-adjusted input signal; a drive controller adapted to provide the first control signal to the RF drive adjust circuit in response to an output of the amplitude detector; a gain element adapted to amplify the drive-adjusted input signal and to output an amplified signal; a dynamic impedance transformer adapted to receive the amplified signal and a second control signal, to output an output signal, and to transform a load impedance presented to the gain element by a load in accordance with the second control signal; and a dynamic impedance transformer controller adapted to provide the second control signal to the dynamic impedance transformer in accordance with a desired amplitude of an envelope of the output signal.