Patent ID: 9179411
Filing Date: 2015-11-03
Classification: H03F,H04B,H04W,Y02D

Abstract:
1. A transmitter for a mobile communication device, comprising: a processor configured to generate a baseband signal and a control signal; a transmit signal path having a modulator configured to up-convert the baseband signal to an RF signal, and a transmit output stage configured to pre-amplify the RF signal; a power amplifier configured to amplify the RF signal that has been pre-amplified; an antenna configured to transmit the RF signal that has been amplified; an envelope tracking signal path comprising a function block configured to convert an envelope of the baseband signal into a shaped envelope signal; an automatic power control loop configured to: an envelope tracking modulator configured to receive the shaped envelope signal from the function block and provide power for the power amplifier that changes based on the shaped envelope signal.