Class-D amplifier and method

A class-D amplifier comprising:

• an analog-to-digital converter (ADC) comprising:
• a non-inverted input node configured to receive a non-inverted analog input signal and an inverted feedback signal;
• an inverted input node configured to receive an inverted analog input signal and a non-inverted feedback signal;
• and
• an output port,
• wherein the ADC is configured to generate a first digital signal at the output port based on the non-inverted analog input signal, the inverted feedback signal, the inverted analog input signal, and the non-inverted feedback signal;
• a loop filter coupled to the output port and configured to modify the first digital signal by moving an error of the ADC out of a predetermined frequency band;
• a compensation filter configured to further modify the first digital signal by introducing one or more poles or zeros, thereby generating a second digital signal;
• and
• an output circuit configured to generate, based on the second digital signal, a first output signal at a first output node and a second output signal at a second output node,
• wherein
• the inverted feedback signal is generated from the first output signal, and
• the non-inverted feedback signal is generated from the second output signal.

A method, comprising:

• generating, by an analog-to-digital converter (ADC), a first digital signal based on an analog input signal and a feedback signal;
• generating a second digital signal from the first digital signal by moving, using a loop filter, an error of the ADC out of a predetermined frequency band, and introducing, using a compensation filter, one or more poles or zeros;
• generating, by a first Class-D output driver of a driver circuit, an output signal based on the second digital signal;
• and
• generating the feedback signal from the output signal.