A high efficiency switch-mode power amplifier based on a cascaded multicell multilevel circuit topology is introduced in the paper. A multicell topology being operated in a unipolar phase-shifted PWM control to switch-mode amplifier system is introduced. After analysising a single-phase H-bridge unipolar PWM inverter’s output, the paper emphasis on the researching of the output of a Cascaded Multilevel Class-D Power Amplifier. The paper analyzes the advanced characteristic of the cascaded multilevel technique. Then a cascaded multilevel class-D power amplifier is built in the laboratory. The result of measurement shows a good following performance and stability.
A practical FPGA-based LUT-predistortion technology for switch-mode power amplifier linearization