Patent attributes
Apparatus and methods for envelope shaping in a mobile device are provided. In certain implementations, a mobile device includes an envelope tracker configured to control a voltage level of a power amplifier supply voltage based on a shaped envelope signal, a power amplifier configured to receive the power amplifier supply voltage and to provide amplification to a radio frequency signal, and a transceiver including a modulator configured to generate the radio frequency signal and an envelope shaping circuit configured to generate the shaped envelope signal by shaping an envelope of the radio frequency signal. The envelope shaping circuit includes a shaping table configured to maintain a substantially constant distortion in a transmit band of the mobile device across a range of the envelope of the radio frequency signal.
