Turner and Slade
Class-D Audio Amplifier Front End Circuit with five-bit digital volume control
ECE 547 “VLSI Design”
Fall Semester 2001
Department of Electrical Engineering
University of Maine
Wayne Homer Slade, Jr. and Steven Eugene Turner
Class-D amplifiers are becoming key components of low power modern consumer devices. Their high efficiency makes them ideal audio amplifiers in laptops, cell-phones, subwoofers, and other mobile audio devices. This VLSI project implements the signal processing “front end” component of a class-D amplifier. The inputs to the circuit are stereo line-in audio, and the outputs are designed to drive an H-bridge for each audio channel. Volume control has also been implemented as a five-bit digital number input.