Linearizing of Low Noise Power Amplifier Using 5.8GHz Double Loop Feedforward Linearization Technique

By Abdulkareem Mokif Obais and Zainab Mustafa Hussein
Department of Electrical Engineering College of Engineering, University of Babylon


Abstract
In this paper, a double loop feedforward linearization technique is analyzed and built with a
MMIC low noise amplifier “HMC753” as main amplifier and a two-stage class-A power amplifier as
error amplifier. The system is operated with 5V DC supply at a center frequency of 5.8GHz and a
bandwidth of 500MHz. The proposed technique, increases the linearity of the MMIC amplifier from
18dBm at 1dB compression point to more than 26dBm. In addition, the proposed system is tested with
OFDM signal and it reveals good response in maximizing the linearity region and eliminating
distortions. The proposed system is designed and simulated onAdvanced Wave Research-Microwave
Office (AWR-MWO).

Keywords : feedforward , linearization techniques , power amplifier , RF amplifier.