Reduce EMI and Maintain High Efficiency with Class D Amplifiers in Portable Applications

By: Trang Nguyen

Abstract: Class D amplifiers are typically very efficient, making them ideal candidates for portable applications that require long battery life and low thermal dissipation. However, electromagnetic interference (EMI) is an issue that commonly accompanies the Class D switching topology. Active-emissions limiting reduces radiated emissions and enables \"filterless\" operation, allowing designers to create small, efficient portable applications with low EMI.