Patent ID: 9197255
Filing Date: 2015-11-24
Classification: H03F,H04B

Abstract:
1. A radio frequency (RF) transmitter comprising: an power amplifier operable to generate a transmit signal modulated with outbound data for transmission to a remote communication device via an antenna section; a power management unit, coupled to the power amplifier, that generates a supply voltage to power the power amplifier, wherein the supply voltage is set by the power management unit based on an average power tracking signal; a processing module, coupled to the power management unit, that adjusts the average power tracking signal based on a desired power level and further based on a desired linearity; a directional coupler, coupled in a transmit path between the power amplifier and the antenna section, configurable to generate a reflected power signal that indicates a reflected power from the antenna section in response to the transmit signal; a first envelope detector, coupled to the directional coupler and the processing module, configurable to generate a reflected power voltage that indicates the reflected power; and wherein the processing module further adjusts the average power tracking signal based on reflected power indicated by the reflected power voltage.