Comparison of different class-D power amplier topologies for 1-bit band-pass delta-sigma D/A converters

Abstract

The suitabilities of two different class-D power ampli er architectures for I-bit bandpass ΔΣ D/A converters operating with RF signals are compared. The objective is to nd out which architecture provides the best ef ciency. The architectures considered are H-bridge voltage-mode class-D ampli er and transformer-coupled voltage-mode class-D ampli er. These architectures are compared by APLAC simulation using a ΔΣ modulated signal and by measuring discrete component GaAs MESFET realisations.