High Efficiency Amplification

摘要

A radio frequency amplification stage comprising: an amplifier for receiving an input signal to be amplified and a power supply voltage; and a power supply voltage stage for supplying said power supply voltage, comprising: means for providing a reference signal representing the envelope of the input signal; means for selecting one of a plurality of supply voltage levels in dependence on the reference signal; and means for generating an adjusted selected power supply voltage, comprising an ac amplifier for amplifying a difference between the reference signal and one of the selected supply voltage level or the adjusted selected supply voltage level, and a summer for summing the amplified difference with the selected supply voltage to thereby generate the adjusted supply voltage.

主权项

1. A power supply system, comprising:
a power source configured to generate first output power; a power supply configured to generate second output power; a power combiner circuit configured to combine the first output power with the second output power to generate combined, third output power; and a feedback circuit coupled to receive a feedback signal indicative of the combined output power through a feedback loop, the feedback circuit configured to compare the feedback signal with a control signal and generate a power supply control signal for controlling the power supply based on a difference between the feedback signal and the control signal, and wherein the power source is not controlled based on the difference between the feedback signal and the control signal.