Switched-Mode Audio Amplifier Employing Power-Supply Audio- Modulation

An amplifier, comprising:

• a modulator to receive an audio input signal and at least one feedback signal and to output a first and second modulation signals corresponding to the audio input signal and the at least one feedback signal, the first and second drive modulation signals being complementary to each other;
• a first power converter coupled to a power supply voltage and the first modulation signal, the first power converter to generate a first voltage signal from the power supply voltage that is modulated by the first modulation signal;
• and
• a second power converter coupled to the power supply voltage and the second modulation signal, the second power converter to generate a second voltage signal from the power supply voltage that is modulated by the second modulation signal, the first and second voltage signals forming a differential audio output signal.

A method, comprising:

• generating a first modulation signal and a second modulation signal based on an input audio signal, the first and second modulation signals being complementary to each other;
• modulating a power supply voltage with the first modulation signal to generate a first voltage signal;
• and
• modulating the power supply voltage with the second modulation signal to generate a second voltage signal, the second voltage signal and the first voltage signal forming a differential audio signal based on the complementary first and second modulation signals.