Design of Broadband 1.9 GHz Ga as MMIC Switching Power Amplifier for PCS Communication Services

Abstract

The paper presents a broadband Monolithic microwave Switching Class–E Power amplifier using 0.5μm GaAs E-pHEMT technology for PCS communications systems operating at 1900MHz.Wider bandwidth is achieved by employing reactance compensation technique in load network of the switching power amplifier. The main Power amplifier is a single stage Class-E circuit with a driver stage driving it to achieve high gain and efficiency. The modified load network using reactance compensation network results in higher power added efficiency. The paper provides simulation results of designed two-stage Class-E Power amplifier circuit results with an power output of 20dBm, power added efficiency of 80% and gain of 26dB at the centre frequency of 1.9GHz compared with various Class-E designs of 1.9 GHz using different technologies. A high linear gain is reported in the design at the frequency range of 0.8GHz to 2.2GHz.The designed circuit achieves a wider bandwidth of 1.35GHz over a frequency range of 0.8-2.2GHz.The physical layout is drawn using GaAs foundry components and EM simulation is performed.