Faculty Advisor

Klein, Andrew G


The goal of this project was to create an 80W, 95% efficient Class D audio amplifier with less than 0.5% harmonic distortion and greater than 100 dB zero-input signal to noise ratio that accepts digital inputs. The amplifier that was built comprised of a three-state digital modulator, an H-bridge amplifier, and a passive filter and was capable of accepting both digital and analog audio inputs by means of the SPDIF protocol and an ADC. To allow the modulator design to be quickly altered, it was implemented on a DSP. Because the modulator could be easily changed, several different modulation schemes were simulated, designed and tested in order to achieve optimal audio quality and efficiency results.


Worcester Polytechnic Institute

Date Accepted

April 2009


Electrical and Computer Engineering

Project Type

Major Qualifying Project



Advisor Department

Electrical and Computer Engineering