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Full Digital Amplifier for Mobile and Handheld Devices

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The Class-D audio amplifier has intrinsic advantage of power-efficiency in mobile and handheld application such as mobile phones and MP3 players. The digital class-D amplifier (in other words, full digital amplifier) is ideal because of better quality audio with integrated DSP capability, while digital interface is immune to noisy environment of handheld systems such as mobile phone. However, this technology could not be adopted in handheld audio systems because of several technological challenges. We will review the issues of full digital amplification in handheld environment. Implementation of SoC is shown for an audio subsystem which was recently applied to multimedia mobile phone.

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