PWM COMPARATOR AND CLASS D AMPLIFIER

摘要

A pulse width modulation (PWM) comparator and a Class D amplifier are provided. In the PWM comparator, a current feedback mechanism is introduced, which is based on a waveform state of a received high frequency triangle signal and a level state of an output signal of the PWM comparator. The hysteresis of the PWM comparator is changed dynamically, so that the noise resistance ability of the PWM comparator is much better than that of the conventional PWM comparators having a fixed hysteresis. The PWM comparator can operate stably even if the duty cycle of the output signal is nearly 100%.