Patent ID: 8111846

Claim:
A method of controlling the output of a modulation circuit comprising: modulating an audio input signal to produce a half-wave rectified pulse-width modulated signal and a complementary half-wave rectified pulse-width modulated signal; amplifying the half-wave rectified pulse-width modulated signal to produce an amplified half-wave rectified pulse-width modulated signal; amplifying the complementary half-wave rectified pulse-width modulated signal to produce an amplified complementary half-wave rectified pulse-width modulated signal; combining the amplified half-wave rectified pulse-width modulated signal with an inverse of the amplified complementary half-wave rectified pulse-width modulated signal to generate a first feedback signal, and combining the amplified complementary half-wave rectified pulse-width modulated signal with an inverse of the amplified half-wave rectified pulse-width modulated signal to generate a second feedback signal; coupling the first feedback signal to a first input of the modulator and coupling the second feedback signal to a second input of the modulator.