Patent ID: 7362168

Claim:
An audio signal amplifier comprising: (a) an input terminal for receiving an input audio signal; (b) an output terminal; (c) a regulator reference generator coupled to the input terminal, wherein the regulator reference generator provides a voltage regulator reference corresponding to the input audio signal; (d) a voltage regulator coupled to the regulator reference generator, wherein the voltage regulator provides a power signal corresponding to the voltage regulator reference; (e) a compensation block coupled to the input terminal to provide a modulation control signal based on the input signal; (f) a modulator coupled to the compensation block wherein the modulator provides a digital modulated signal in response to the modulation control signal; and (g) an output stage coupled to the modulator and the voltage regulator, wherein the output stage provides an output audio signal at the output terminal by combining the digital modulated signal and the power signal.