Patent ID: 8140030

Claim:
A transmitter, comprising: an amplitude modulator configured to amplitude-modulate a power supply signal according to amplitude variations in an amplitude modulation signal; a nonlinear power amplifier (PA) having a radio frequency (RF) input port configured to receive an RF input signal, a power supply port configured to receive the amplitude-modulated power supply signal from said amplitude modulator, and an RF output port, said nonlinear PA operable to produce an amplitude-modulated RF signal at its RF output port based on amplitude variations in said amplitude-modulated power supply signal; and an adaptive impedance converter configured to control an effective load impedance appearing at the RF output port of the nonlinear PA, said adaptive impedance converter being configured to control the effective load impedance appearing at the RF output port of the nonlinear PA in response to a power control signal indicative of an average transmitter output power.