Patent ID: 7692567

Claim:
A distortion correction circuit comprising: a first circuit including: a delta-sigma modulator that performs delta-sigma modulation of an input signal supplied thereto and outputs the resultant signal; and a pulse-width modulator that receives the signal output from said delta-sigma modulator and outputs a pulse-width-modulated signal having a pulse width corresponding to the received signal; a second circuit disposed in front of said first circuit, said second circuit having a configuration identical with or equivalent to that of said first circuit, said second circuit receiving an input signal and subjecting the signal to signal processing identical with or equivalent to that of said first circuit, wherein an output signal of said second circuit includes a distortion component equivalent to a distortion component produced in a case where the input signal is supplied to said first circuit; and a circuit that extracts a signal, which includes a distortion component and from which the input signal component is excluded, from the output signal of said second circuit; wherein a signal obtained by subtracting the extracted signal including the distortion component from the input signal is supplied to said first circuit, and said first circuit outputs a signal corrected for the distortion component.