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.
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