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 configured to combine a switched supply signal with a correction signal, and configured to generate a corrected supply signal; a correction stage, coupled to the combiner, configured to generate the correction signal in dependence on a difference between a reference signal and the corrected supply signal; and a supply stage, coupled to the correction stage, configured to provide the switched supply signal, wherein the supply stage is configured to provide the switched supply signal independent of the correction signal.