High-fidelity energy-efficient audio power amplifier for mobile applications

Abstract

Audio amplifiers have been studied over the past century and shares a history with electronic circuits themselves. Further, since audio amplifier research is a long-standing field, it can be said that there are relatively few gaps in knowledge compared to other fields. However, as the mobile device revolution occurred in the last 10 years, new requirements for audio systems have arisen, and research on them is underway. In particular, two new directions are being proposed, and it is important to implement them with the existing high efficiency and high fidelity. The first is the low quiescent current, and the second is the support of the boosted output swing. Innovative solutions to these problems are presented in this thesis.