An all digital switching amplifier wherein linearization of the power switch is accomplished solely by using three states. A small, fixed width, bi-state compensating carrier waveform is added to the leading or training edges of an oversampled main input pulse producing a compensated composite waveform....http://www.google.ca/patents/US5617058?utm_source=gb-gplus-sharePatent US5617058 - Digital signal processing for linearization of small input signals to a tri-state power switch
