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1. (WO2018162746) POWER AMPLIFIER WITH STEPWISE ENVELOPE TRACKING AND ADAPTIVE LOAD

Pub. No.:    WO/2018/162746    International Application No.:    PCT/EP2018/055972
Publication Date: Fri Sep 14 01:59:59 CEST 2018 International Filing Date: Sat Mar 10 00:59:59 CET 2018
IPC: H03F 1/02
H03F 3/193
H03F 3/24
Applicants: ACCO
Inventors: PIERRE-CHARLES-FELIX, Pascal
KIMON, Vivien
GUÉGNAUD, Hervé
VINAYAK, Vikas
Title: POWER AMPLIFIER WITH STEPWISE ENVELOPE TRACKING AND ADAPTIVE LOAD
Abstract:
Circuity for improving linearity and efficiency in mobile device power amplification is provided. The circuitry provides multi-level envelope tracking to divide the input power range of the RF input signal into several discrete steps and to control the supply voltage to the power amplifier accordingly. The circuitry also provides multi- level gate control to add a bias voltage to the RF input signal at each stage of the power amplifier to correct for phase and gain distortions. The circuitry further provides an adaptive load on the power amplifier by measuring the resistive and imaginary parts of the load at the output of the power stage of the power amplifier and adjusting an output matching network that follows the power stage.