Design and Implementation of Doherty Power Amplifier of Global System Mobile (GSM) of Base station

Abstract

Power amplifier is the main component of wireless communication system. This paper presents the efficiency improvement of linear Power amplifier for GSM base station using Doherty Power Amplifier (DPA). A DPA operating at 900 MHz and a supply voltage of (2.5-3)V. The DPA is a combination of a carrier amplifier biased to class AB mode and a peaking amplifier biased to class C mode. Each amplifier was design by GaAs FET using advance design system software package (ADS). The simulation results of DPA are compared with class AB power amplifier that a show improvement in power added efficiency at output power with acceptable power gain.