a converter of a digital signal into a pulse - width modulated signal , comprising a first conversion unit receiving , at a first frequency , successive digital signals each having one of a first determined number of values , and providing first intermediary signals , at the first frequency , each having one of a second determined number of values smaller than the first determined number ; a unit performing a decimation of the first intermediary signals to provide second intermediary signals at a second frequency equal to the first frequency divided by the second determined number minus one ; and a second conversion unit providing at the second frequency , from the second intermediary signals , a two - state pulse - width modulated signal having a minimum duration in one of the two states which is equal to the inverse of the first frequency , the first conversion unit receiving the pulse - width modulated signal .