Patent ID: 7157969

Claim:
An electronic class-D amplifier comprising: an amplifier input adapted to receive an amplifier input signal, an amplifier output adapted to produce an amplifier output signal, an output switching stage, at least one servo-loop amplifier plus pulse width modulator, a controlled delay stage including a delay modulation input, an input signal processor, wherein the amplifier input is connected to an input of the servo-loop amplifier plus pulse width modulator, the amplifier input being connected to an input of the input signal processor which modifies the amplifier input signal, an output of the input signal processor being connected to the delay modulation input of the controlled delay stage, an output of the servo-loop amplifier plus pulse width modulator being connected to an input of the controlled delay stage, an output of the controlled delay stage being connected to an input of the output switching stage, and an output of the output switching stage being connected to the amplifier output, wherein a negative feedback path connects an output of the output switching stage to an input of the servo-loop amplifier.