ARRANGEMENT FOR AMPLIFYING A PWM INPUT SIGNAL

摘要

A pulse width modulation (PWM) amplifier comprises a feedback loop for reshaping the pulses of the PWM input signal to correct timing and amplitude errors in the class D output stage of the amplifier. The arrangement enhances the error correction by using a pulse width modulated triangle whose zero crossings substantially coincide with the edges of the PWM input signal. The triangle may be obtained by full integration of a modified PWM signal whose zero crossings lie in the middle of the pulses of the PWM input signal.