US 2026/0196975 A1 · AUDIO AMPLIFIER WITH CLIPPING CONTROL

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.

Claims21

Dependent claims

A control circuit for an audio amplifier, comprising:

a reference voltage generator configured to generate a first reference voltage and a second reference voltage according to a power supply voltage of the audio amplifier;
a voltage limiter configured to receive an audio input signal, the first reference voltage and the second reference voltage, and generate an adjusted audio signal according to the audio input signal, the first reference voltage, and the second reference voltage, wherein 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 adjusted audio signal is limited to the second reference voltage when the voltage level of the audio input signal is lower than the second reference voltage.

An audio amplifier integrated circuit (IC) comprising:

an input voltage clipper configured to receive an audio input signal, generate a first amplitude according to a power supply voltage, and generate an adjusted audio signal according to the audio input signal and the first amplitude, wherein an amplitude of the adjusted audio signal is not greater than the first amplitude;
and
an audio amplifier coupled to the input voltage clipper and configured to amplify the adjusted audio signal and provide an output signal;
wherein a voltage level of the output signal is limited to no greater than the power supply voltage of the audio amplifier.

1 more element

A Class-D audio amplifier, comprising:

an input voltage clipper configured to receive an audio input signal, generate a first amplitude according to a power supply voltage, and generate an adjusted audio signal according to the audio input signal and the first amplitude, wherein an amplitude of the adjusted audio signal is not greater than the first amplitude;
and
an audio amplifier circuit coupled to the input voltage clipper and configured to amplify the adjusted audio signal and provide an audio output signal;
wherein an amplitude of the audio output signal is limited to a value of the power supply voltage of the Class-D audio amplifier.

1 more element

Dependencies are inferred from the claim text.

Audio amplifier with clipping control

Life of this patent

Audio amplifier with clipping control

Life of this patent

Abstract

Claims21