Distortion mitigation in RF transmitters with cascaded nonlinear and efficient power amplifiers
Paper i proceeding, 2014

The requirements on the linearization algorithm stemming from the use of a nonlinear amplifier to drive the power amplifier is investigated. It is theoretically shown under which conditions the nonlinear driver amplifier does not create additional nonlinear dynamic effects that have to be compensated. Experimental results using two cascaded Doherty amplifiers show that this cascade setup creates nonlinear distortion which the standard memory polynomial (MP) cannot properly linearize. A solution in the form of the vector-switched MP is shown to properly linearize the system. Experiments also show that it is possible to bias the driver Doherty amplifier's main branch in deeper class-AB without loosing linearity when an appropriate linearization algorithm is used.

Författare

Per Landin

Chalmers, Signaler och system, Kommunikationssystem, informationsteori och antenner, Kommunikationssystem

GigaHertz Centrum

Ulf Gustavsson

Ericsson AB

2014 IEEE 15th Annual IEEE Wireless and Microwave Technology Conference, WAMICON 2014

Art. no. 6857778-

Ämneskategorier

Elektroteknik och elektronik

DOI

10.1109/WAMICON.2014.6857778

ISBN

978-147994608-2

Mer information

Senast uppdaterat

2018-11-19