A GaN-Based Monolithic Full-Bridge Class D Audio Amplifier

This paper presents the analysis and the experimental validation of a high-frequency Class D audio amplifier. The peculiarity is the use of a GaN-based monolithic full-bridge. On the one side, GaN technology allows achieving very high operating frequency with low power losses. On the other side, the monolithic nature of the power converter enables a strong reduction of device switching losses and electrical stresses. Moreover, by combing the GaN technology with the monolithic nature of the power converter in a truly innovative package, a notable improvement of the total harmonic distortion (THD) and of the sound quality can be obtained. The developed application is characterized by a 2.3MHz operating frequency.