A new Class-K*audio amplifier with high-power efficiency and high fidelity is integrated in a 0.35-μm CMOS process. It proposes a new topology connected Class-D amplifier with fast-switching charge-dump (FSCD) amplifier in parallel. The integration of the amplifier requires neither analog buffer amplifier nor a complex compensation circuit needed in hybrid audio amplifier (Class-K). The FSCD amplifier composed of comparators and switches works at a high-switching frequency in order to absorb the distortion caused by Class-D amplifier switching. Thus, this assists the audio amplifier to have good linearity under switching operation. With the proposed topology, the audio amplifier has a flat frequency response with - 3-dB bandwidth of 60 KHz and is capable of delivering up to 257 mW into 4.1-Ω load with maximum efficiency of 81%. A typical total harmonic distortion plus noise (THD+N) is less than 0.1% at the power level over 25 mW within the audio frequency range (20 Hz-20 kHz), and the minimum THD+Nis 0.025% with the audio input frequency of 1 kHz at the output power of 114 mW.
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Lee et al. (2009) studied this question.
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