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

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.

[1]  P. Asbeck,et al.  Current mode class-D power amplifiers for high efficiency RF applications , 2001, 2001 IEEE MTT-S International Microwave Sympsoium Digest (Cat. No.01CH37157).

[2]  D. Dapkus.  Class-D audio power amplifiers: an overview , 2000, 2000 Digest of Technical Papers. International Conference on Consumer Electronics. Nineteenth in the Series (Cat. No.00CH37102).

[3]  S.-A. El-Hamamsy,et al.  Design of high-efficiency RF Class-D power amplifier , 1994 .

[4]  Frederick H. Raab,et al.  Solid State Radio Engineering , 1980 .

[5]  Henry Shu-Hung Chung,et al.  Realization of digital audio amplifier using zero-voltage-switched PWM power converter , 2000 .