Patent ID: 8400217
Filing Date: 2013-03-19
Classification: H03F,H03G

Abstract:
1. A radio frequency (RF) power amplifier system comprising: a power amplifier configured to receive and amplify an RF input signal to generate an RF output signal; a power calculation block configured to generate an envelope power signal indicative of an estimated instantaneous envelope power of the RF output signal based on a function of digital modulation components of the RF input signal and an estimation of a gain of the power amplifier, the power calculation block also including a time delay in generating the envelope power signal; and a power amplifier VCC controller coupled to the power amplifier and configured to generate a supply voltage control signal for controlling a supply voltage to the power amplifier at an amplitude modulation rate of the RF input signal by referencing the envelope power signal to a look-up-table, the look-up-table including values for the supply voltage control signal that correspond to the envelope power signal, the power amplifier VCC controller also adjusting the supply voltage control signal responsive to a parameter indicative of impedance mismatch at an output of the power amplifier.