Patent ID: 9209758
Filing Date: 2015-12-08
Classification: H03F,H03G,H04B

Abstract:
1. A radio frequency (RF) power amplifier system, comprising: RF power amplifier; a digital-to-RF modulator to generate an RF input signal for the RF power amplifier based on input information indicative of amplitude values and phase values; a voltage control unit to provide a variable supply voltage to the RF power amplifier in response to one or more control signals, the variable supply voltage being selected from a plurality of discrete voltage levels; and a controller configured to; wherein the voltage control unit includes: an output terminal to provide an output voltage signal, the output terminal being coupled to a supply input of the RF power amplifier; first, second, and third voltage terminals to carry first, second, and third discrete voltage levels in the plurality of discrete voltage levels, respectively; a first switch coupled between the output terminal and the first voltage terminal; a second switch coupled between the output terminal and a first intermediate node; a third switch coupled between the first intermediate node and the second voltage terminal; and a network comprising at least one switch coupled between the first intermediate node and the third voltage terminal; wherein the controller is configured to control states of at least the second switch and the at least one switch.