The PWM signal will be very robust to noise since it is either a 0 or a 1 instead of a small analog voltage. A class-D amplifier is a very inexpensive way to convert analog to PWM. A class-D amplifier ...

Today's PWM operates interchangeably as either purely digital control of an analog function or with analog feedback that places it into the mixed-signal category. KEITH CURTIS, Technical Staff ...

Fig. 5 shows a simplified application diagram, using the AB signals from a phase-shifted full bridge PWM controller to drive the synchronous rectifiers of a current doubler output stage.