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A 3.4 W Digital-In Class-D Audio Amplifier in 0.14 \mu m CMOS

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2 Author(s)
Dooper, L. ; NXP Semicond., Nijmegen, Netherlands ; Berkhout, M.

In this paper a class-D audio amplifier for mobile applications is presented realized in a 0.14 μm CMOS technology tailored for mobile applications. The amplifier has a simple PDM-based digital interface for audio and control that requires only two pins and enables assembly in 9-bump WL-CSP. The complete audio path is discussed that consists of a Parser, Digital PWM controller, 1-bit DA-converters, analog feedback loop and the Class-D power stage. A reconfigurable gate driver is used that reduces quiescent current consumption and radiated emission.

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Solid-State Circuits, IEEE Journal of  (Volume:47 ,  Issue: 7 )