Design and development of a high efficiency modulated Class E amplifier

Thumbnail Image
Crafford, Crafford, Hendrik Lambert Helberg Hendrik Lambert Helberg
Journal Title
Journal ISSN
Volume Title
Amplitude modulation is not commonly associated with effective amplifying. This work focuses on implementing amplitude modulation into a high efficiency Class E amplifier. Different types of amplifiers are compared with each other, to show the advantages of using a Class E amplifier. The theory of the Class E amplifier is dealt with in detail. A harmonic filter is designed for the amplifier to make it radio spectrum friendly. The modulation process is implemented with the aid of a transformer into the Class E amplifier. The advantage of this is that the transformer serves both as a radio frequency choke for the Class E circuit as well as a modulator. The implementation of the amplitude modulation into the high efficient Class E circuit was successful. The final Class E circuit had superb efficiency, the harmonic filter showed good harmonic attenuation and the modulation process had low distortion. All this resulted in a fine low power AM transmitter.
M. Tech. (Chemical Engineering, Faculty of Engineering and Technology), Vaal University of Technology
Class E amplifier, Amplifiers, Transformers