Abstract:
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.
Description:
M. Tech. (Chemical Engineering, Faculty of Engineering and Technology), Vaal University of Technology
