Patent ID: 9490752
Filing Date: 2016-11-08
CPC Classification: H03F,H03G,H04B

Claim Text:
1. A radio frequency (RF) power amplifier system, comprising: an RF amplifier; a digital-to-RF modulator to generate an RF input signal for the RF amplifier based on at least one modulator control signal; a voltage control unit configured to provide a variable supply voltage to the RF amplifier in response to at least one voltage control signal, the variable supply voltage being selected from a plurality of discrete voltage levels; a controller to provide the at least one modulator control signal to the digital-to-RF modulator and the at least one voltage control signal to the voltage control unit based, at least in part, on data to be amplified by the RF amplifier; and a transition shaping filter coupled between the RF amplifier and the voltage control unit, said transition shaping filter to filter a variable supply voltage to be applied to the RF amplifier so as to provide shaping and/or bandwidth limitation of the voltage transitions between discrete voltage levels, wherein the transition shaping filter is configured to reduce frequency content at an output of the RF amplifier by shaping the voltage transitions between discrete voltage levels of the variable supply voltage provided to the RF amplifier.