AI cyber-physical systems often rely on voice interfaces that require audio power amplifiers. Designing amplifiers that balance high efficiency with dynamic response is challenging due to the complexity of their design and the influence of integrated components on performance. Energy efficiency is crucial for audio amplifiers in mobile devices, as it directly affects battery life. Recent research has concentrated on enhancing audio quality and efficiency, particularly in Class G and Class H audio amplifiers. This article reviews the latest advancements and trends in mobile amplifier design, focusing on improvements in efficiency, power supply noise rejection (PSRR), and total harmonic distortion plus noise (THD+N).