LINEARIZATION OF BROADBAND TWO-WAY MICROSTRIP DOHERTY AMPLIFIER

Facta Universitatis, Series: Electronics and Energetics

Aleksandar Atanasković²  Nataša Petar Maleš-Ilić³  Aleksandra Đorić¹ 

[1] Innovation Center of Advanced Technologies, Niš, Serbia$$;Faculty of Electrical Engeneering, University of Niš$$;University of Niš, Faculty of Electronic Engineering$$

关键词: Doherty amplifier;    broadband;    microstrip;    OFDM signal;    linearization;    second- and fourth-order nonlinear signals;    intermodulation products.;   

DOI  :  10.2298/FUEE1601127M

来源: University of Nis

【 摘 要 】

The linearization of a broadband two-way microstrip Doherty amplifier designed for application in the frequency range 0.9-1.0 GHz is considered in this paper. The amplifier characterized by the maximum output power 8 W is designed in microstrip technique for broadband applications. For linearization purposes, the second- and fourth-order nonlinear signals are extracted at the output of the peaking cell, adjusted in amplitude and phase and fed at the input and output of the carrier transistor over the microstrip hairpin band-pass filters. The effects of the linearization are considered through the simulation for two sinusoidal signals with different frequency interval between them setting on from 5 MHz and going up to30 MHz at different input power levels up to saturation, as well as for an Orthogonal frequency division multiplexing (OFDM) digitally modulated signal.

【 授权许可】

Unknown