Patent ID: 7795962

Claim:
An error correction apparatus of a switching power amplifier, the apparatus comprising: a pulse width modulation (PWM) unit to convert an audio signal into a PWM signal; a power stage unit to switch and amplify power of the PWM signal generated by the PWM unit; an error signal extraction unit to compare a reference PWM signal generated in the PWM unit with the PWM signal output from the power stage unit, thereby extracting an error signal; a remodulation unit to compare the error signal extracted in the error signal extraction unit with a reference signal having a predetermined slope, and to generate a remodulated error PWM signal; a signal correction unit to correct an error by adjusting a pulse width of the PWM signal according to the error PWM signal generated in the remodulation unit; a comparison unit to compare the error signal extracted in the error signal extraction unit with the reference signal having the predetermined slope and to extract an error PWM signal; and a digitizer to convert the error PWM signal output from the comparison unit into a digital error PWM signal according to a system clock.