Class-D amplifiers are two to four times more efficient than class-AB amplifiers, whichprovides a solution for applications where lower supply current, lower heat dissipation, or longer batterylife are necessary. However, traditional class-D amplifiers introduce other problems: increased solutionsize and cost. These class-D amplifiers require an output filter to operate. A new modulation scheme hasbeen developed to eliminate the need for an output filter. This paper discusses the advantages of class-Dover class-AB and focuses on the details of the new modulation scheme, and why it enables filterlessoperation. This paper also discusses the effect that eliminating the output filter has on supply current,efficiency, sound quality, and Electro-magnetic interference (EMI).
展开▼
