This paper presents a third-order audio class-D amplifier, implemented in a 0.18-μm CMOS technology, achieving −92 dB of total harmonic distortion (THD) and 105 dBA of dynamic range (DR) with a quiescent current of 2 mA. The circuit delivers up to 2.4 W on a 4-Ω load with a peak efficiency of 88%. The THD performance, achieved thanks to the thirdorder loop filter, makes the proposed device suitable for high-end audio applications, where linear amplifiers are still the dominant solution.
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