Patent ID: 7142050
Filing Date: 2006-11-28
Classification: H03F

Abstract:
1. An audio amplifier, comprising: difference circuitry, for generating a difference signal responsive to an input signal and a feedback signal; a first comparator, for generating first pulse-width-modulated output pulses at an output responsive to a comparison of the difference signal and a periodic reference waveform; a power stage, for driving an amplifier output responsive to the first pulse-width-modulated output pulses; a loop filter for filtering a signal corresponding to the amplifier output to produce the feedback signal, the loop filter comprising at least one integrator; clip detection circuitry, having a first input coupled to the output of the first comparator and a second input coupled to receive the periodic reference waveform, for detecting clipping at the amplifier output; and circuitry for applying a signal to at least one integrator in the loop filter responsive to the clip detection circuitry detecting clipping at the amplifier output.