Design of Highly Efficient Load Modulation Transmitter for Wideband Cellular Applications
Journal article, 2010

In this paper, the high potential of varactor-based dynamic load modulation (DLM) techniques for wideband cellular applications is demonstrated. A systematic design procedure is proposed to ensure high-efficiency wideband performance. It incorporates harmonically tuned power amplifier (PA) concepts and tunable matching techniques in an integrated design. A DLM transmitter at 2.65 GHz with a peak output power of 6 W is designed using the proposed procedure. In order to investigate the wideband performance of the implemented demonstrator, WCDMA signals with scaled bandwidths are employed. The signal peak-to-average ratio is 7 dB and the same for all the experiments. For the 38.4-MHz signal, which has a corresponding channel bandwidth of > 40 MHz, an average power added-efficiency (PAE) of 44%, normalized mean square error (NMSE) of -35 dB, and adjacent channel leakage ratio (ACLR) of -43 dBc are measured.

LDMOS FET

LTE

linearization

load modulation

4G

GaN HEMT

power amplifier (PA)

Digital predistortion (DPD)

efficiency

Author

Hossein Mashad Nemati

GigaHertz Centre

Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics

Haiying Cao

GigaHertz Centre

Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics

B. Almgren

Ericsson AB

Christian Fager

Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics

GigaHertz Centre

Thomas Eriksson

GigaHertz Centre

Chalmers, Signals and Systems, Communication and Antenna Systems, Communication Systems

IEEE Transactions on Microwave Theory and Techniques

0018-9480 (ISSN)

Vol. 58 11 2820-2828

Subject Categories

Electrical Engineering, Electronic Engineering, Information Engineering

DOI

10.1109/TMTT.2010.2077914

More information

Latest update

11/19/2018