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 stage, comprising:
a combiner for combining a switched supply signal with a correction signal, and for generating a corrected supply signal; a correction stage for generating the correction signal in dependence on a difference between a reference signal and the corrected supply signal; and a supply stage for providing the switched supply signal, wherein the supply stage does not provide the selected supply signal in dependence on the correction signal.