A 13.56MHz AD9850 Oscillator with E-Class Power Amplifier for Wireless Power Charging

Abstract

In this paper, the characterization of a 13.56MHz oscillator equipped with E-class power amplifier for wireless power charging is discussed. The oscillator is constructed using a CMOS digital direct synthesizer (DDS) of AD9850 type from Analog Device. The use of AD9850 oscillator is due to its stability in generating the sine wave frequency of 13.56MHz required for the transmitter system of wireless power charging. While the E-class power amplifier is empowered by two cascaded MOSFETs of IRF510 and IRF620 types to obtain the high gain amplification. Prior hardware realization, a circuit & EM simulator software is used to simulate the proposed design. The experimental characterization demonstrates that the power amplifier could amplify the sine wave output of AD9850 oscillator up to 36.3dB suitable for the desired application.