Tutorial review: audio amplifiers in mobile platforms
Feature phones, smart phones, PDAs and many other similar apparatus are becoming a real presence in every day's life. This convergence of features broadens the audio demands on the system and increases the difficulties to solve audio problems. Class D speaker amplifiers are becoming the de facto standard for smart phones and feature rich phones due to their high efficiency. However the switching nature of these circuits, the availability of supplies required to provide high power and the intrinsic worst linearity compared to linear amplifiers, have lead the designer to find new architectures and topologies in order to solve those issues. An overview on Class D amplifiers implementation for mobile phones and last design solution is provided in this paper.
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