Measurement & Extraction of the Low-Frequency Dynamics of an Envelope Tracking Amplifier using Multisine Excitations
Paper in proceedings, 2018

Both efficiency and linearity of an Envelope Tracking Power Amplifier depend on the tight synchronization between a Low- and High-Frequency path. The presence of reactive elements in this Low-Frequency path, as well as an inevitable delay difference between both paths, results in a dynamic mismatch that can seriously degrade the overall performance of the device. This work introduces a method that is able to extract these Low-Frequency dynamics without requiring access to any internal nodes of the device. The proposed extraction procedure makes use of the combination of a linear parameter-varying framework and a specific signal excitation strategy which uses a multisine excitation to mimic the operational conditions of the amplifier. A trustworthy model for the Low-Frequency dynamics is an important component necessary for building an adequate pre-distortion tool that is able to eliminate a bad dynamic match.

Envelope Shaping

Digital Pre-Distortion

Linear-Parameter Varying Model

Envelope Tracking

Author

Piet Bronders

Vrije Universiteit Brussel (VUB)

Jan Goos

Vrije Universiteit Brussel (VUB)

John Lataire

Vrije Universiteit Brussel (VUB)

Yves Rolain

Vrije Universiteit Brussel (VUB)

Gerd Vandersteen

Vrije Universiteit Brussel (VUB)

Guillaume Pailloncy

National Instruments

Sebastian Gustafsson

Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics

IEEE MTT-S International Microwave Symposium Digest

0149645X (ISSN)

Vol. 2018-June 1039-1042 8439139

2018 IEEE/MTT-S International Microwave Symposium, IMS 2018
Philadelphia, USA,

Subject Categories

Control Engineering

Signal Processing

Other Electrical Engineering, Electronic Engineering, Information Engineering

DOI

10.1109/MWSYM.2018.8439139

More information

Latest update

1/17/2019