Methods and systems for modulating an input electrical signal are disclosed and may comprise modulating input signals utilizing a digital Class-D modulator and generating a digital output signal that is proportional to the input signals. The digital Class-D modulator may be comprised of four stages....http://www.google.de/patents/US7714675?utm_source=gb-gplus-sharePatent US7714675 - All digital Class-D modulator and its saturation protection techniques
