Patent ID: 7576606

Claim:
An amplifier, comprising: an audio signal path including a pulse width modulator that produces nonlinear effects; power switch devices that produce an output in dependence on an output of the pulse width modulator; and a low delay corrector (LDC) receiving an input and producing an output; and a feedback path including an analog-to-digital converter (ADC) that receives an input in dependence on the output of the power switch devices; wherein the feedback path is configured to provide a feedback signal, in dependence on the output of the power switch devices, to the audio signal path; wherein the LDC is configured to compensate for at least a portion of the non-linear effects of the pulse width modulator, subject to a requirement of low delay; wherein an input to the pulse width modulator is derived in dependence on an output of the LDC; and wherein the input to the LDC is derived in dependence on the output of the ADC as well as a digital input audio signal input to the audio signal path.