Class-d audio amplifier with clipping control, control circuit and integrated circuit thereof

Abstract

A control circuit for an audio amplifier includes a reference voltage generator and a voltage limiter. The reference voltage generator generates a first reference voltage and a second reference voltage according to a power supply voltage of the audio amplifier. The voltage limiter receives an audio input signal, the first reference voltage and the second reference voltage, and generates an adjusted audio signal according to the audio input signal, the first reference voltage, and the second reference voltage. The adjusted audio signal is limited to the first reference voltage when a voltage level of the audio input signal is higher than the first reference voltage, and the audio input signal is limited to the second reference voltage when the voltage level of the audio input signal is lower than the second reference voltage.

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