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Distortion mitigation in RF transmitters with cascaded nonlinear and efficient power amplifiers

Per N. Landin (GigaHertz Centrum ; Institutionen för signaler och system, Kommunikationssystem) ; U. Gustavsson
2014 IEEE 15th Annual IEEE Wireless and Microwave Technology Conference, WAMICON 2014 p. Art. no. 6857778. (2014)
[Konferensbidrag, refereegranskat]

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.



Denna post skapades 2014-09-01. Senast ändrad 2015-05-25.
CPL Pubid: 202170

 

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Institutioner (Chalmers)

GigaHertz Centrum
Institutionen för signaler och system, Kommunikationssystem

Ämnesområden

Elektroteknik och elektronik

Chalmers infrastruktur