Patent ID: 9054643
Filing Date: 2015-06-09
Classification: H03F,H04B

Abstract:
1. A method of calibrating an envelope tracking system for a supply voltage for a power amplifier module within a radio frequency (RF) transmitter module of a wireless communication unit; the method comprising, within at least one signal processing module of the wireless communication unit: determining combinations of the power amplifier supply voltage and power amplifier input power that provide a power amplifier output power equal to a target output power; obtaining battery current indications for the determined combinations of the power amplifier supply voltage and power amplifier input power that provide a power amplifier output power equal to a target output power; selecting a combination of the power amplifier supply voltage and power amplifier input power that provide a power amplifier output power equal to a target output power based at least partly on the obtained battery current indications therefore; and calibrating the envelope tracking system using the selected combination of the power amplifier supply voltage and power amplifier input power.