A novel 2GHz highly efficiency improved class-E Power Amplifier for Base stations

This paper presents a design of a novel RF Power Amplifier which is suitable for Base stations and modern wireless communication systems. High broadband power efficiency is observed from 1.7-2.7 GHz, where PAE> 80% when we use second harmonic input tuning. The main purpose for applying second harmonic tuning circuit is to improve the switching behaviour and enhance the efficiency for a class-E power amplifier. Without any harmonic circuitry, we obtain a PAE of 77% and after optimizing the component parameter, the input and output terminals are both well matched and addition of second harmonic trap circuit improves efficiency to 81%. A new output power circuit technique is employed for proposed Power Amplifier by using combination of inductors and capacitors of different sizes. The technique involves the use to combine the output of individual Power Amplifier into an unbalance load by use of a small RF-choke in output matching circuit. The proposed Power Amplifier is simulated by using Agilent's Advanced Design System (ADS) and result shows that Power Amplifier deliver 81% efficiency with respect to input RF Power and 28dBm Output Power at 2GHz frequency. This work has the highest Efficiency among the reported work in class-E Power Amplifier design using different methods. The purpose of this paper is to demonstrate the designing of Power Amplifier and improvement in efficiency while maintaining the stability.