Predictive feedback compensation for PWM switching amplifiers

A digital switching amplifier having output pulse amplitude error correction, comprising:

• amplitude error prediction circuitry configured to sense a voltage representing the output pulse amplitude for a PWM output signal, to determine a predicted output pulse amplitude error for a PWM input signal using the sensed voltage, and to output a predictive error correction signal proportional to a ratio of the predicted output pulse amplitude error to an output pulse amplitude weighted by a pulse width;
• width adjustment circuitry coupled to receive the predictive error correction signal and a PWM input signal having a pulse width and configured to output a pre-compensated PWM signal with a pre-compensated pulse width representing a width adjustment based upon the predictive error correction signal;
• and
• switching amplifier driver circuitry configured to receive the pre-compensated PWM signal and to drive a PWM output signal.