Analysis of Class E Power Amplifier With Shunt Filter under Different Duty Cycles

Abstract

Class E power amplifier is a class of power amplifier with high efficiency. It is widely used in wireless communications. In this paper, class E power amplifier with shunt filter under different duty cycles is analysis by ideal models, and the theoretical analysis is validated by simulations. Analysis reveals that the waveform and efficiency for the power amplifier varies with different duty cycles. The efficiency drops down much when the duty cycle is far way from 50%. A Class E power amplifier with shunt filter working at 1GHz with 0.5W output is designed. The power amplifier under duty cycles of 30%, 40%, 50%, 60% and 70% are simulated. Simulation results agree well with the theoretical analysis. The class E power amplifier with shunt filter can keep efficiency above 95% with duty cycles in 40% to 60%.