Low delay, low power and high linearity class-d modulation loop

A circuit comprising:

• a plurality of integrator circuits arranged in series and configured to receive an input signal at a first of the plurality of integrators and generate an integrated signal from a last of the plurality of integrators;
• a quantizer arranged to receive the integrated signal and generate an output signal;
• a filter arranged to receive a feedback signal comprising the output signal and generate a filtered feedback signal, which is applied to an input of the first of the plurality of integrators;
• and
• a feedback signal path configured to receive the feedback signal and apply the feedback signal to an input of a second of the plurality of integrators.

A system comprising:

• an audio amplifier configured to receive an audio input signal and output an amplified audio signal to a loudspeaker, the audio amplifier comprising:
• a plurality of integrators arranged in series to receive the audio input signal and generate the amplified audio signal;
• and
• a feedback signal path configured to filter the amplified output signal and generate a filtered feedback signal which is applied to the audio input signal before input to a first of the plurality of integrators.