Patent ID: 7570693

Claim:
A loop that corrects distortion caused by transforming an oversampled pulse code modulated signal to a pulse width modulated signal, comprising; an input for a wide-bit input signal; a differencing element coupled to the input and accepting the wide-bit input signal; an input filter coupled to the differencing element; at least one oversampler coupled to the input filter, producing at least one oversampled signal having less precision and higher frequency than the wide-bit input signal; a plurality of pulse width modulators coupled to the at least one oversampler, operation of the pulse width modulators being offset in time; a plurality of outputs coupled to the pulse width modulators; and a digital feedback filter coupled to the pulse width modulators, the digital feedback filter producing a correction signal that at least partially compensates for undesired distortion introduced by the pulse width modulators, formatting the correction signal to match precision and frequency of the wide-bit input signal, and feeding back the formatted correction signal to the differencing element.