Linearity, Intermodulation Distortion and ACLR in Outphasing Amplifiers
Paper in proceedings, 2013

The distortion from amplitude and phase imbalance in outphasing amplifiers is discussed. The relation between dynamic range (DR) and suppression of distortion is shown to approximately follow a simple linear relationship depending on the DR. Approximate relations between adjacent channel leakage power ratio (ACLR) for different kinds of commonly used communication signals and two-tone intermodulation distortion are given. Relations between loss in output power and reduction of DR as functions of duty cycle in switching-based outphasing amplifiers are also given. An approximate method to evaluate the possible performance of digital pre-distortion (DPD) is also given by considering a DPD capable of correcting all distortions except amplitude imbalance. The predicted performance is compared to the performance obtained using a DPD-model found in the literature. The results show that the method is in good agreement, demonstrating that the proposed method can be used for design and evaluation of predistorted outphasing amplifiers.


Power amplifier

Nonlinear distortion



J Fritzin

Linköping University

Ericsson AB

A. Alvandpour

Linköping University

Per Landin

University of Gävle

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

Christian Fager

Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics

IEEE MTT-S International Microwave Symposium Digest

0149645X (ISSN)


Areas of Advance

Information and Communication Technology

Subject Categories


Communication Systems

Electrical Engineering, Electronic Engineering, Information Engineering





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